mirror of https://gitee.com/openkylin/linux.git
4546 lines
106 KiB
C
4546 lines
106 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* PACKET - implements raw packet sockets.
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*
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Alan Cox, <gw4pts@gw4pts.ampr.org>
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*
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* Fixes:
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* Alan Cox : verify_area() now used correctly
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* Alan Cox : new skbuff lists, look ma no backlogs!
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* Alan Cox : tidied skbuff lists.
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* Alan Cox : Now uses generic datagram routines I
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* added. Also fixed the peek/read crash
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* from all old Linux datagram code.
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* Alan Cox : Uses the improved datagram code.
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* Alan Cox : Added NULL's for socket options.
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* Alan Cox : Re-commented the code.
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* Alan Cox : Use new kernel side addressing
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* Rob Janssen : Correct MTU usage.
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* Dave Platt : Counter leaks caused by incorrect
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* interrupt locking and some slightly
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* dubious gcc output. Can you read
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* compiler: it said _VOLATILE_
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* Richard Kooijman : Timestamp fixes.
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* Alan Cox : New buffers. Use sk->mac.raw.
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* Alan Cox : sendmsg/recvmsg support.
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* Alan Cox : Protocol setting support
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* Alexey Kuznetsov : Untied from IPv4 stack.
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* Cyrus Durgin : Fixed kerneld for kmod.
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* Michal Ostrowski : Module initialization cleanup.
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* Ulises Alonso : Frame number limit removal and
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* packet_set_ring memory leak.
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* Eric Biederman : Allow for > 8 byte hardware addresses.
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* The convention is that longer addresses
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* will simply extend the hardware address
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* byte arrays at the end of sockaddr_ll
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* and packet_mreq.
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* Johann Baudy : Added TX RING.
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* Chetan Loke : Implemented TPACKET_V3 block abstraction
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* layer.
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* Copyright (C) 2011, <lokec@ccs.neu.edu>
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/capability.h>
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#include <linux/fcntl.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/if_packet.h>
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#include <linux/wireless.h>
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#include <linux/kernel.h>
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#include <linux/kmod.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <net/net_namespace.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <linux/errno.h>
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#include <linux/timer.h>
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#include <asm/uaccess.h>
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#include <asm/ioctls.h>
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#include <asm/page.h>
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#include <asm/cacheflush.h>
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#include <asm/io.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/poll.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/if_vlan.h>
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#include <linux/virtio_net.h>
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#include <linux/errqueue.h>
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#include <linux/net_tstamp.h>
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#include <linux/percpu.h>
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#ifdef CONFIG_INET
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#include <net/inet_common.h>
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#endif
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#include <linux/bpf.h>
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#include <net/compat.h>
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#include "internal.h"
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/*
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Assumptions:
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- if device has no dev->hard_header routine, it adds and removes ll header
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inside itself. In this case ll header is invisible outside of device,
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but higher levels still should reserve dev->hard_header_len.
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Some devices are enough clever to reallocate skb, when header
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will not fit to reserved space (tunnel), another ones are silly
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(PPP).
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- packet socket receives packets with pulled ll header,
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so that SOCK_RAW should push it back.
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On receive:
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-----------
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Incoming, dev->hard_header!=NULL
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mac_header -> ll header
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data -> data
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Outgoing, dev->hard_header!=NULL
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mac_header -> ll header
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data -> ll header
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Incoming, dev->hard_header==NULL
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mac_header -> UNKNOWN position. It is very likely, that it points to ll
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header. PPP makes it, that is wrong, because introduce
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assymetry between rx and tx paths.
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data -> data
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Outgoing, dev->hard_header==NULL
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mac_header -> data. ll header is still not built!
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data -> data
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Resume
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If dev->hard_header==NULL we are unlikely to restore sensible ll header.
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|
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On transmit:
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------------
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dev->hard_header != NULL
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mac_header -> ll header
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data -> ll header
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dev->hard_header == NULL (ll header is added by device, we cannot control it)
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mac_header -> data
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data -> data
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We should set nh.raw on output to correct posistion,
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packet classifier depends on it.
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*/
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/* Private packet socket structures. */
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/* identical to struct packet_mreq except it has
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* a longer address field.
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*/
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struct packet_mreq_max {
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int mr_ifindex;
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unsigned short mr_type;
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unsigned short mr_alen;
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unsigned char mr_address[MAX_ADDR_LEN];
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};
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union tpacket_uhdr {
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struct tpacket_hdr *h1;
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struct tpacket2_hdr *h2;
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struct tpacket3_hdr *h3;
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void *raw;
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};
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static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
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int closing, int tx_ring);
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#define V3_ALIGNMENT (8)
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#define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
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#define BLK_PLUS_PRIV(sz_of_priv) \
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(BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))
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#define PGV_FROM_VMALLOC 1
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#define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
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#define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
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#define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
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#define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
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#define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
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#define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
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#define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
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struct packet_sock;
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static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
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static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt, struct net_device *orig_dev);
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static void *packet_previous_frame(struct packet_sock *po,
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struct packet_ring_buffer *rb,
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int status);
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static void packet_increment_head(struct packet_ring_buffer *buff);
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static int prb_curr_blk_in_use(struct tpacket_kbdq_core *,
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struct tpacket_block_desc *);
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static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
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struct packet_sock *);
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static void prb_retire_current_block(struct tpacket_kbdq_core *,
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struct packet_sock *, unsigned int status);
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static int prb_queue_frozen(struct tpacket_kbdq_core *);
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static void prb_open_block(struct tpacket_kbdq_core *,
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struct tpacket_block_desc *);
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static void prb_retire_rx_blk_timer_expired(unsigned long);
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static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
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static void prb_init_blk_timer(struct packet_sock *,
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struct tpacket_kbdq_core *,
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void (*func) (unsigned long));
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static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
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static void prb_clear_rxhash(struct tpacket_kbdq_core *,
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struct tpacket3_hdr *);
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static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
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struct tpacket3_hdr *);
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static void packet_flush_mclist(struct sock *sk);
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struct packet_skb_cb {
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union {
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struct sockaddr_pkt pkt;
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union {
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/* Trick: alias skb original length with
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* ll.sll_family and ll.protocol in order
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* to save room.
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*/
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unsigned int origlen;
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struct sockaddr_ll ll;
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};
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} sa;
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};
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#define vio_le() virtio_legacy_is_little_endian()
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#define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
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#define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
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#define GET_PBLOCK_DESC(x, bid) \
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((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
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#define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
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((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
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#define GET_NEXT_PRB_BLK_NUM(x) \
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(((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
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((x)->kactive_blk_num+1) : 0)
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static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
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static void __fanout_link(struct sock *sk, struct packet_sock *po);
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static int packet_direct_xmit(struct sk_buff *skb)
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{
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struct net_device *dev = skb->dev;
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struct sk_buff *orig_skb = skb;
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struct netdev_queue *txq;
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int ret = NETDEV_TX_BUSY;
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if (unlikely(!netif_running(dev) ||
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!netif_carrier_ok(dev)))
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goto drop;
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skb = validate_xmit_skb_list(skb, dev);
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if (skb != orig_skb)
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goto drop;
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txq = skb_get_tx_queue(dev, skb);
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local_bh_disable();
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HARD_TX_LOCK(dev, txq, smp_processor_id());
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if (!netif_xmit_frozen_or_drv_stopped(txq))
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ret = netdev_start_xmit(skb, dev, txq, false);
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HARD_TX_UNLOCK(dev, txq);
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local_bh_enable();
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if (!dev_xmit_complete(ret))
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kfree_skb(skb);
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return ret;
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drop:
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atomic_long_inc(&dev->tx_dropped);
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kfree_skb_list(skb);
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return NET_XMIT_DROP;
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}
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static struct net_device *packet_cached_dev_get(struct packet_sock *po)
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{
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struct net_device *dev;
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rcu_read_lock();
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dev = rcu_dereference(po->cached_dev);
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if (likely(dev))
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dev_hold(dev);
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rcu_read_unlock();
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return dev;
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}
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static void packet_cached_dev_assign(struct packet_sock *po,
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struct net_device *dev)
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{
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rcu_assign_pointer(po->cached_dev, dev);
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}
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static void packet_cached_dev_reset(struct packet_sock *po)
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{
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RCU_INIT_POINTER(po->cached_dev, NULL);
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}
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static bool packet_use_direct_xmit(const struct packet_sock *po)
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{
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return po->xmit == packet_direct_xmit;
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}
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static u16 __packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
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{
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return (u16) raw_smp_processor_id() % dev->real_num_tx_queues;
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}
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static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
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{
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const struct net_device_ops *ops = dev->netdev_ops;
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u16 queue_index;
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if (ops->ndo_select_queue) {
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queue_index = ops->ndo_select_queue(dev, skb, NULL,
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__packet_pick_tx_queue);
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queue_index = netdev_cap_txqueue(dev, queue_index);
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} else {
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queue_index = __packet_pick_tx_queue(dev, skb);
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}
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skb_set_queue_mapping(skb, queue_index);
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}
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/* register_prot_hook must be invoked with the po->bind_lock held,
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* or from a context in which asynchronous accesses to the packet
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* socket is not possible (packet_create()).
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*/
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static void register_prot_hook(struct sock *sk)
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{
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struct packet_sock *po = pkt_sk(sk);
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if (!po->running) {
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if (po->fanout)
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__fanout_link(sk, po);
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else
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dev_add_pack(&po->prot_hook);
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sock_hold(sk);
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po->running = 1;
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}
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}
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|
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/* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
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* held. If the sync parameter is true, we will temporarily drop
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* the po->bind_lock and do a synchronize_net to make sure no
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* asynchronous packet processing paths still refer to the elements
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* of po->prot_hook. If the sync parameter is false, it is the
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* callers responsibility to take care of this.
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*/
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static void __unregister_prot_hook(struct sock *sk, bool sync)
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{
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struct packet_sock *po = pkt_sk(sk);
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po->running = 0;
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if (po->fanout)
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__fanout_unlink(sk, po);
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else
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__dev_remove_pack(&po->prot_hook);
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|
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__sock_put(sk);
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if (sync) {
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spin_unlock(&po->bind_lock);
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synchronize_net();
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spin_lock(&po->bind_lock);
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}
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}
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|
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static void unregister_prot_hook(struct sock *sk, bool sync)
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{
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struct packet_sock *po = pkt_sk(sk);
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|
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if (po->running)
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__unregister_prot_hook(sk, sync);
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}
|
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|
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static inline struct page * __pure pgv_to_page(void *addr)
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{
|
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if (is_vmalloc_addr(addr))
|
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return vmalloc_to_page(addr);
|
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return virt_to_page(addr);
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}
|
|
|
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static void __packet_set_status(struct packet_sock *po, void *frame, int status)
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{
|
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union tpacket_uhdr h;
|
|
|
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h.raw = frame;
|
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switch (po->tp_version) {
|
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case TPACKET_V1:
|
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h.h1->tp_status = status;
|
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flush_dcache_page(pgv_to_page(&h.h1->tp_status));
|
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break;
|
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case TPACKET_V2:
|
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h.h2->tp_status = status;
|
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flush_dcache_page(pgv_to_page(&h.h2->tp_status));
|
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break;
|
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case TPACKET_V3:
|
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default:
|
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WARN(1, "TPACKET version not supported.\n");
|
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BUG();
|
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}
|
|
|
|
smp_wmb();
|
|
}
|
|
|
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static int __packet_get_status(struct packet_sock *po, void *frame)
|
|
{
|
|
union tpacket_uhdr h;
|
|
|
|
smp_rmb();
|
|
|
|
h.raw = frame;
|
|
switch (po->tp_version) {
|
|
case TPACKET_V1:
|
|
flush_dcache_page(pgv_to_page(&h.h1->tp_status));
|
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return h.h1->tp_status;
|
|
case TPACKET_V2:
|
|
flush_dcache_page(pgv_to_page(&h.h2->tp_status));
|
|
return h.h2->tp_status;
|
|
case TPACKET_V3:
|
|
default:
|
|
WARN(1, "TPACKET version not supported.\n");
|
|
BUG();
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts,
|
|
unsigned int flags)
|
|
{
|
|
struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
|
|
|
|
if (shhwtstamps &&
|
|
(flags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
|
|
ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts))
|
|
return TP_STATUS_TS_RAW_HARDWARE;
|
|
|
|
if (ktime_to_timespec_cond(skb->tstamp, ts))
|
|
return TP_STATUS_TS_SOFTWARE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame,
|
|
struct sk_buff *skb)
|
|
{
|
|
union tpacket_uhdr h;
|
|
struct timespec ts;
|
|
__u32 ts_status;
|
|
|
|
if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
|
|
return 0;
|
|
|
|
h.raw = frame;
|
|
switch (po->tp_version) {
|
|
case TPACKET_V1:
|
|
h.h1->tp_sec = ts.tv_sec;
|
|
h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
|
|
break;
|
|
case TPACKET_V2:
|
|
h.h2->tp_sec = ts.tv_sec;
|
|
h.h2->tp_nsec = ts.tv_nsec;
|
|
break;
|
|
case TPACKET_V3:
|
|
default:
|
|
WARN(1, "TPACKET version not supported.\n");
|
|
BUG();
|
|
}
|
|
|
|
/* one flush is safe, as both fields always lie on the same cacheline */
|
|
flush_dcache_page(pgv_to_page(&h.h1->tp_sec));
|
|
smp_wmb();
|
|
|
|
return ts_status;
|
|
}
|
|
|
|
static void *packet_lookup_frame(struct packet_sock *po,
|
|
struct packet_ring_buffer *rb,
|
|
unsigned int position,
|
|
int status)
|
|
{
|
|
unsigned int pg_vec_pos, frame_offset;
|
|
union tpacket_uhdr h;
|
|
|
|
pg_vec_pos = position / rb->frames_per_block;
|
|
frame_offset = position % rb->frames_per_block;
|
|
|
|
h.raw = rb->pg_vec[pg_vec_pos].buffer +
|
|
(frame_offset * rb->frame_size);
|
|
|
|
if (status != __packet_get_status(po, h.raw))
|
|
return NULL;
|
|
|
|
return h.raw;
|
|
}
|
|
|
|
static void *packet_current_frame(struct packet_sock *po,
|
|
struct packet_ring_buffer *rb,
|
|
int status)
|
|
{
|
|
return packet_lookup_frame(po, rb, rb->head, status);
|
|
}
|
|
|
|
static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
|
|
{
|
|
del_timer_sync(&pkc->retire_blk_timer);
|
|
}
|
|
|
|
static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
|
|
struct sk_buff_head *rb_queue)
|
|
{
|
|
struct tpacket_kbdq_core *pkc;
|
|
|
|
pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
|
|
|
|
spin_lock_bh(&rb_queue->lock);
|
|
pkc->delete_blk_timer = 1;
|
|
spin_unlock_bh(&rb_queue->lock);
|
|
|
|
prb_del_retire_blk_timer(pkc);
|
|
}
|
|
|
|
static void prb_init_blk_timer(struct packet_sock *po,
|
|
struct tpacket_kbdq_core *pkc,
|
|
void (*func) (unsigned long))
|
|
{
|
|
init_timer(&pkc->retire_blk_timer);
|
|
pkc->retire_blk_timer.data = (long)po;
|
|
pkc->retire_blk_timer.function = func;
|
|
pkc->retire_blk_timer.expires = jiffies;
|
|
}
|
|
|
|
static void prb_setup_retire_blk_timer(struct packet_sock *po)
|
|
{
|
|
struct tpacket_kbdq_core *pkc;
|
|
|
|
pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
|
|
prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired);
|
|
}
|
|
|
|
static int prb_calc_retire_blk_tmo(struct packet_sock *po,
|
|
int blk_size_in_bytes)
|
|
{
|
|
struct net_device *dev;
|
|
unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
|
|
struct ethtool_link_ksettings ecmd;
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
|
|
if (unlikely(!dev)) {
|
|
rtnl_unlock();
|
|
return DEFAULT_PRB_RETIRE_TOV;
|
|
}
|
|
err = __ethtool_get_link_ksettings(dev, &ecmd);
|
|
rtnl_unlock();
|
|
if (!err) {
|
|
/*
|
|
* If the link speed is so slow you don't really
|
|
* need to worry about perf anyways
|
|
*/
|
|
if (ecmd.base.speed < SPEED_1000 ||
|
|
ecmd.base.speed == SPEED_UNKNOWN) {
|
|
return DEFAULT_PRB_RETIRE_TOV;
|
|
} else {
|
|
msec = 1;
|
|
div = ecmd.base.speed / 1000;
|
|
}
|
|
}
|
|
|
|
mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
|
|
|
|
if (div)
|
|
mbits /= div;
|
|
|
|
tmo = mbits * msec;
|
|
|
|
if (div)
|
|
return tmo+1;
|
|
return tmo;
|
|
}
|
|
|
|
static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
|
|
union tpacket_req_u *req_u)
|
|
{
|
|
p1->feature_req_word = req_u->req3.tp_feature_req_word;
|
|
}
|
|
|
|
static void init_prb_bdqc(struct packet_sock *po,
|
|
struct packet_ring_buffer *rb,
|
|
struct pgv *pg_vec,
|
|
union tpacket_req_u *req_u)
|
|
{
|
|
struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb);
|
|
struct tpacket_block_desc *pbd;
|
|
|
|
memset(p1, 0x0, sizeof(*p1));
|
|
|
|
p1->knxt_seq_num = 1;
|
|
p1->pkbdq = pg_vec;
|
|
pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
|
|
p1->pkblk_start = pg_vec[0].buffer;
|
|
p1->kblk_size = req_u->req3.tp_block_size;
|
|
p1->knum_blocks = req_u->req3.tp_block_nr;
|
|
p1->hdrlen = po->tp_hdrlen;
|
|
p1->version = po->tp_version;
|
|
p1->last_kactive_blk_num = 0;
|
|
po->stats.stats3.tp_freeze_q_cnt = 0;
|
|
if (req_u->req3.tp_retire_blk_tov)
|
|
p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
|
|
else
|
|
p1->retire_blk_tov = prb_calc_retire_blk_tmo(po,
|
|
req_u->req3.tp_block_size);
|
|
p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov);
|
|
p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv;
|
|
|
|
p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv);
|
|
prb_init_ft_ops(p1, req_u);
|
|
prb_setup_retire_blk_timer(po);
|
|
prb_open_block(p1, pbd);
|
|
}
|
|
|
|
/* Do NOT update the last_blk_num first.
|
|
* Assumes sk_buff_head lock is held.
|
|
*/
|
|
static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
|
|
{
|
|
mod_timer(&pkc->retire_blk_timer,
|
|
jiffies + pkc->tov_in_jiffies);
|
|
pkc->last_kactive_blk_num = pkc->kactive_blk_num;
|
|
}
|
|
|
|
/*
|
|
* Timer logic:
|
|
* 1) We refresh the timer only when we open a block.
|
|
* By doing this we don't waste cycles refreshing the timer
|
|
* on packet-by-packet basis.
|
|
*
|
|
* With a 1MB block-size, on a 1Gbps line, it will take
|
|
* i) ~8 ms to fill a block + ii) memcpy etc.
|
|
* In this cut we are not accounting for the memcpy time.
|
|
*
|
|
* So, if the user sets the 'tmo' to 10ms then the timer
|
|
* will never fire while the block is still getting filled
|
|
* (which is what we want). However, the user could choose
|
|
* to close a block early and that's fine.
|
|
*
|
|
* But when the timer does fire, we check whether or not to refresh it.
|
|
* Since the tmo granularity is in msecs, it is not too expensive
|
|
* to refresh the timer, lets say every '8' msecs.
|
|
* Either the user can set the 'tmo' or we can derive it based on
|
|
* a) line-speed and b) block-size.
|
|
* prb_calc_retire_blk_tmo() calculates the tmo.
|
|
*
|
|
*/
|
|
static void prb_retire_rx_blk_timer_expired(unsigned long data)
|
|
{
|
|
struct packet_sock *po = (struct packet_sock *)data;
|
|
struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
|
|
unsigned int frozen;
|
|
struct tpacket_block_desc *pbd;
|
|
|
|
spin_lock(&po->sk.sk_receive_queue.lock);
|
|
|
|
frozen = prb_queue_frozen(pkc);
|
|
pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
|
|
|
|
if (unlikely(pkc->delete_blk_timer))
|
|
goto out;
|
|
|
|
/* We only need to plug the race when the block is partially filled.
|
|
* tpacket_rcv:
|
|
* lock(); increment BLOCK_NUM_PKTS; unlock()
|
|
* copy_bits() is in progress ...
|
|
* timer fires on other cpu:
|
|
* we can't retire the current block because copy_bits
|
|
* is in progress.
|
|
*
|
|
*/
|
|
if (BLOCK_NUM_PKTS(pbd)) {
|
|
while (atomic_read(&pkc->blk_fill_in_prog)) {
|
|
/* Waiting for skb_copy_bits to finish... */
|
|
cpu_relax();
|
|
}
|
|
}
|
|
|
|
if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
|
|
if (!frozen) {
|
|
if (!BLOCK_NUM_PKTS(pbd)) {
|
|
/* An empty block. Just refresh the timer. */
|
|
goto refresh_timer;
|
|
}
|
|
prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
|
|
if (!prb_dispatch_next_block(pkc, po))
|
|
goto refresh_timer;
|
|
else
|
|
goto out;
|
|
} else {
|
|
/* Case 1. Queue was frozen because user-space was
|
|
* lagging behind.
|
|
*/
|
|
if (prb_curr_blk_in_use(pkc, pbd)) {
|
|
/*
|
|
* Ok, user-space is still behind.
|
|
* So just refresh the timer.
|
|
*/
|
|
goto refresh_timer;
|
|
} else {
|
|
/* Case 2. queue was frozen,user-space caught up,
|
|
* now the link went idle && the timer fired.
|
|
* We don't have a block to close.So we open this
|
|
* block and restart the timer.
|
|
* opening a block thaws the queue,restarts timer
|
|
* Thawing/timer-refresh is a side effect.
|
|
*/
|
|
prb_open_block(pkc, pbd);
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
refresh_timer:
|
|
_prb_refresh_rx_retire_blk_timer(pkc);
|
|
|
|
out:
|
|
spin_unlock(&po->sk.sk_receive_queue.lock);
|
|
}
|
|
|
|
static void prb_flush_block(struct tpacket_kbdq_core *pkc1,
|
|
struct tpacket_block_desc *pbd1, __u32 status)
|
|
{
|
|
/* Flush everything minus the block header */
|
|
|
|
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
|
|
u8 *start, *end;
|
|
|
|
start = (u8 *)pbd1;
|
|
|
|
/* Skip the block header(we know header WILL fit in 4K) */
|
|
start += PAGE_SIZE;
|
|
|
|
end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end);
|
|
for (; start < end; start += PAGE_SIZE)
|
|
flush_dcache_page(pgv_to_page(start));
|
|
|
|
smp_wmb();
|
|
#endif
|
|
|
|
/* Now update the block status. */
|
|
|
|
BLOCK_STATUS(pbd1) = status;
|
|
|
|
/* Flush the block header */
|
|
|
|
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
|
|
start = (u8 *)pbd1;
|
|
flush_dcache_page(pgv_to_page(start));
|
|
|
|
smp_wmb();
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Side effect:
|
|
*
|
|
* 1) flush the block
|
|
* 2) Increment active_blk_num
|
|
*
|
|
* Note:We DONT refresh the timer on purpose.
|
|
* Because almost always the next block will be opened.
|
|
*/
|
|
static void prb_close_block(struct tpacket_kbdq_core *pkc1,
|
|
struct tpacket_block_desc *pbd1,
|
|
struct packet_sock *po, unsigned int stat)
|
|
{
|
|
__u32 status = TP_STATUS_USER | stat;
|
|
|
|
struct tpacket3_hdr *last_pkt;
|
|
struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
|
|
struct sock *sk = &po->sk;
|
|
|
|
if (po->stats.stats3.tp_drops)
|
|
status |= TP_STATUS_LOSING;
|
|
|
|
last_pkt = (struct tpacket3_hdr *)pkc1->prev;
|
|
last_pkt->tp_next_offset = 0;
|
|
|
|
/* Get the ts of the last pkt */
|
|
if (BLOCK_NUM_PKTS(pbd1)) {
|
|
h1->ts_last_pkt.ts_sec = last_pkt->tp_sec;
|
|
h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec;
|
|
} else {
|
|
/* Ok, we tmo'd - so get the current time.
|
|
*
|
|
* It shouldn't really happen as we don't close empty
|
|
* blocks. See prb_retire_rx_blk_timer_expired().
|
|
*/
|
|
struct timespec ts;
|
|
getnstimeofday(&ts);
|
|
h1->ts_last_pkt.ts_sec = ts.tv_sec;
|
|
h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
|
|
}
|
|
|
|
smp_wmb();
|
|
|
|
/* Flush the block */
|
|
prb_flush_block(pkc1, pbd1, status);
|
|
|
|
sk->sk_data_ready(sk);
|
|
|
|
pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
|
|
}
|
|
|
|
static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
|
|
{
|
|
pkc->reset_pending_on_curr_blk = 0;
|
|
}
|
|
|
|
/*
|
|
* Side effect of opening a block:
|
|
*
|
|
* 1) prb_queue is thawed.
|
|
* 2) retire_blk_timer is refreshed.
|
|
*
|
|
*/
|
|
static void prb_open_block(struct tpacket_kbdq_core *pkc1,
|
|
struct tpacket_block_desc *pbd1)
|
|
{
|
|
struct timespec ts;
|
|
struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
|
|
|
|
smp_rmb();
|
|
|
|
/* We could have just memset this but we will lose the
|
|
* flexibility of making the priv area sticky
|
|
*/
|
|
|
|
BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
|
|
BLOCK_NUM_PKTS(pbd1) = 0;
|
|
BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
|
|
|
|
getnstimeofday(&ts);
|
|
|
|
h1->ts_first_pkt.ts_sec = ts.tv_sec;
|
|
h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
|
|
|
|
pkc1->pkblk_start = (char *)pbd1;
|
|
pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
|
|
|
|
BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
|
|
BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
|
|
|
|
pbd1->version = pkc1->version;
|
|
pkc1->prev = pkc1->nxt_offset;
|
|
pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
|
|
|
|
prb_thaw_queue(pkc1);
|
|
_prb_refresh_rx_retire_blk_timer(pkc1);
|
|
|
|
smp_wmb();
|
|
}
|
|
|
|
/*
|
|
* Queue freeze logic:
|
|
* 1) Assume tp_block_nr = 8 blocks.
|
|
* 2) At time 't0', user opens Rx ring.
|
|
* 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
|
|
* 4) user-space is either sleeping or processing block '0'.
|
|
* 5) tpacket_rcv is currently filling block '7', since there is no space left,
|
|
* it will close block-7,loop around and try to fill block '0'.
|
|
* call-flow:
|
|
* __packet_lookup_frame_in_block
|
|
* prb_retire_current_block()
|
|
* prb_dispatch_next_block()
|
|
* |->(BLOCK_STATUS == USER) evaluates to true
|
|
* 5.1) Since block-0 is currently in-use, we just freeze the queue.
|
|
* 6) Now there are two cases:
|
|
* 6.1) Link goes idle right after the queue is frozen.
|
|
* But remember, the last open_block() refreshed the timer.
|
|
* When this timer expires,it will refresh itself so that we can
|
|
* re-open block-0 in near future.
|
|
* 6.2) Link is busy and keeps on receiving packets. This is a simple
|
|
* case and __packet_lookup_frame_in_block will check if block-0
|
|
* is free and can now be re-used.
|
|
*/
|
|
static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
|
|
struct packet_sock *po)
|
|
{
|
|
pkc->reset_pending_on_curr_blk = 1;
|
|
po->stats.stats3.tp_freeze_q_cnt++;
|
|
}
|
|
|
|
#define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
|
|
|
|
/*
|
|
* If the next block is free then we will dispatch it
|
|
* and return a good offset.
|
|
* Else, we will freeze the queue.
|
|
* So, caller must check the return value.
|
|
*/
|
|
static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
|
|
struct packet_sock *po)
|
|
{
|
|
struct tpacket_block_desc *pbd;
|
|
|
|
smp_rmb();
|
|
|
|
/* 1. Get current block num */
|
|
pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
|
|
|
|
/* 2. If this block is currently in_use then freeze the queue */
|
|
if (TP_STATUS_USER & BLOCK_STATUS(pbd)) {
|
|
prb_freeze_queue(pkc, po);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* 3.
|
|
* open this block and return the offset where the first packet
|
|
* needs to get stored.
|
|
*/
|
|
prb_open_block(pkc, pbd);
|
|
return (void *)pkc->nxt_offset;
|
|
}
|
|
|
|
static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
|
|
struct packet_sock *po, unsigned int status)
|
|
{
|
|
struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
|
|
|
|
/* retire/close the current block */
|
|
if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
|
|
/*
|
|
* Plug the case where copy_bits() is in progress on
|
|
* cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
|
|
* have space to copy the pkt in the current block and
|
|
* called prb_retire_current_block()
|
|
*
|
|
* We don't need to worry about the TMO case because
|
|
* the timer-handler already handled this case.
|
|
*/
|
|
if (!(status & TP_STATUS_BLK_TMO)) {
|
|
while (atomic_read(&pkc->blk_fill_in_prog)) {
|
|
/* Waiting for skb_copy_bits to finish... */
|
|
cpu_relax();
|
|
}
|
|
}
|
|
prb_close_block(pkc, pbd, po, status);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc,
|
|
struct tpacket_block_desc *pbd)
|
|
{
|
|
return TP_STATUS_USER & BLOCK_STATUS(pbd);
|
|
}
|
|
|
|
static int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
|
|
{
|
|
return pkc->reset_pending_on_curr_blk;
|
|
}
|
|
|
|
static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
|
|
{
|
|
struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
|
|
atomic_dec(&pkc->blk_fill_in_prog);
|
|
}
|
|
|
|
static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
|
|
struct tpacket3_hdr *ppd)
|
|
{
|
|
ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb);
|
|
}
|
|
|
|
static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
|
|
struct tpacket3_hdr *ppd)
|
|
{
|
|
ppd->hv1.tp_rxhash = 0;
|
|
}
|
|
|
|
static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
|
|
struct tpacket3_hdr *ppd)
|
|
{
|
|
if (skb_vlan_tag_present(pkc->skb)) {
|
|
ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb);
|
|
ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto);
|
|
ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
|
|
} else {
|
|
ppd->hv1.tp_vlan_tci = 0;
|
|
ppd->hv1.tp_vlan_tpid = 0;
|
|
ppd->tp_status = TP_STATUS_AVAILABLE;
|
|
}
|
|
}
|
|
|
|
static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
|
|
struct tpacket3_hdr *ppd)
|
|
{
|
|
ppd->hv1.tp_padding = 0;
|
|
prb_fill_vlan_info(pkc, ppd);
|
|
|
|
if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
|
|
prb_fill_rxhash(pkc, ppd);
|
|
else
|
|
prb_clear_rxhash(pkc, ppd);
|
|
}
|
|
|
|
static void prb_fill_curr_block(char *curr,
|
|
struct tpacket_kbdq_core *pkc,
|
|
struct tpacket_block_desc *pbd,
|
|
unsigned int len)
|
|
{
|
|
struct tpacket3_hdr *ppd;
|
|
|
|
ppd = (struct tpacket3_hdr *)curr;
|
|
ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
|
|
pkc->prev = curr;
|
|
pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len);
|
|
BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len);
|
|
BLOCK_NUM_PKTS(pbd) += 1;
|
|
atomic_inc(&pkc->blk_fill_in_prog);
|
|
prb_run_all_ft_ops(pkc, ppd);
|
|
}
|
|
|
|
/* Assumes caller has the sk->rx_queue.lock */
|
|
static void *__packet_lookup_frame_in_block(struct packet_sock *po,
|
|
struct sk_buff *skb,
|
|
int status,
|
|
unsigned int len
|
|
)
|
|
{
|
|
struct tpacket_kbdq_core *pkc;
|
|
struct tpacket_block_desc *pbd;
|
|
char *curr, *end;
|
|
|
|
pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
|
|
pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
|
|
|
|
/* Queue is frozen when user space is lagging behind */
|
|
if (prb_queue_frozen(pkc)) {
|
|
/*
|
|
* Check if that last block which caused the queue to freeze,
|
|
* is still in_use by user-space.
|
|
*/
|
|
if (prb_curr_blk_in_use(pkc, pbd)) {
|
|
/* Can't record this packet */
|
|
return NULL;
|
|
} else {
|
|
/*
|
|
* Ok, the block was released by user-space.
|
|
* Now let's open that block.
|
|
* opening a block also thaws the queue.
|
|
* Thawing is a side effect.
|
|
*/
|
|
prb_open_block(pkc, pbd);
|
|
}
|
|
}
|
|
|
|
smp_mb();
|
|
curr = pkc->nxt_offset;
|
|
pkc->skb = skb;
|
|
end = (char *)pbd + pkc->kblk_size;
|
|
|
|
/* first try the current block */
|
|
if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) {
|
|
prb_fill_curr_block(curr, pkc, pbd, len);
|
|
return (void *)curr;
|
|
}
|
|
|
|
/* Ok, close the current block */
|
|
prb_retire_current_block(pkc, po, 0);
|
|
|
|
/* Now, try to dispatch the next block */
|
|
curr = (char *)prb_dispatch_next_block(pkc, po);
|
|
if (curr) {
|
|
pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
|
|
prb_fill_curr_block(curr, pkc, pbd, len);
|
|
return (void *)curr;
|
|
}
|
|
|
|
/*
|
|
* No free blocks are available.user_space hasn't caught up yet.
|
|
* Queue was just frozen and now this packet will get dropped.
|
|
*/
|
|
return NULL;
|
|
}
|
|
|
|
static void *packet_current_rx_frame(struct packet_sock *po,
|
|
struct sk_buff *skb,
|
|
int status, unsigned int len)
|
|
{
|
|
char *curr = NULL;
|
|
switch (po->tp_version) {
|
|
case TPACKET_V1:
|
|
case TPACKET_V2:
|
|
curr = packet_lookup_frame(po, &po->rx_ring,
|
|
po->rx_ring.head, status);
|
|
return curr;
|
|
case TPACKET_V3:
|
|
return __packet_lookup_frame_in_block(po, skb, status, len);
|
|
default:
|
|
WARN(1, "TPACKET version not supported\n");
|
|
BUG();
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static void *prb_lookup_block(struct packet_sock *po,
|
|
struct packet_ring_buffer *rb,
|
|
unsigned int idx,
|
|
int status)
|
|
{
|
|
struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
|
|
struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx);
|
|
|
|
if (status != BLOCK_STATUS(pbd))
|
|
return NULL;
|
|
return pbd;
|
|
}
|
|
|
|
static int prb_previous_blk_num(struct packet_ring_buffer *rb)
|
|
{
|
|
unsigned int prev;
|
|
if (rb->prb_bdqc.kactive_blk_num)
|
|
prev = rb->prb_bdqc.kactive_blk_num-1;
|
|
else
|
|
prev = rb->prb_bdqc.knum_blocks-1;
|
|
return prev;
|
|
}
|
|
|
|
/* Assumes caller has held the rx_queue.lock */
|
|
static void *__prb_previous_block(struct packet_sock *po,
|
|
struct packet_ring_buffer *rb,
|
|
int status)
|
|
{
|
|
unsigned int previous = prb_previous_blk_num(rb);
|
|
return prb_lookup_block(po, rb, previous, status);
|
|
}
|
|
|
|
static void *packet_previous_rx_frame(struct packet_sock *po,
|
|
struct packet_ring_buffer *rb,
|
|
int status)
|
|
{
|
|
if (po->tp_version <= TPACKET_V2)
|
|
return packet_previous_frame(po, rb, status);
|
|
|
|
return __prb_previous_block(po, rb, status);
|
|
}
|
|
|
|
static void packet_increment_rx_head(struct packet_sock *po,
|
|
struct packet_ring_buffer *rb)
|
|
{
|
|
switch (po->tp_version) {
|
|
case TPACKET_V1:
|
|
case TPACKET_V2:
|
|
return packet_increment_head(rb);
|
|
case TPACKET_V3:
|
|
default:
|
|
WARN(1, "TPACKET version not supported.\n");
|
|
BUG();
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void *packet_previous_frame(struct packet_sock *po,
|
|
struct packet_ring_buffer *rb,
|
|
int status)
|
|
{
|
|
unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
|
|
return packet_lookup_frame(po, rb, previous, status);
|
|
}
|
|
|
|
static void packet_increment_head(struct packet_ring_buffer *buff)
|
|
{
|
|
buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
|
|
}
|
|
|
|
static void packet_inc_pending(struct packet_ring_buffer *rb)
|
|
{
|
|
this_cpu_inc(*rb->pending_refcnt);
|
|
}
|
|
|
|
static void packet_dec_pending(struct packet_ring_buffer *rb)
|
|
{
|
|
this_cpu_dec(*rb->pending_refcnt);
|
|
}
|
|
|
|
static unsigned int packet_read_pending(const struct packet_ring_buffer *rb)
|
|
{
|
|
unsigned int refcnt = 0;
|
|
int cpu;
|
|
|
|
/* We don't use pending refcount in rx_ring. */
|
|
if (rb->pending_refcnt == NULL)
|
|
return 0;
|
|
|
|
for_each_possible_cpu(cpu)
|
|
refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu);
|
|
|
|
return refcnt;
|
|
}
|
|
|
|
static int packet_alloc_pending(struct packet_sock *po)
|
|
{
|
|
po->rx_ring.pending_refcnt = NULL;
|
|
|
|
po->tx_ring.pending_refcnt = alloc_percpu(unsigned int);
|
|
if (unlikely(po->tx_ring.pending_refcnt == NULL))
|
|
return -ENOBUFS;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void packet_free_pending(struct packet_sock *po)
|
|
{
|
|
free_percpu(po->tx_ring.pending_refcnt);
|
|
}
|
|
|
|
#define ROOM_POW_OFF 2
|
|
#define ROOM_NONE 0x0
|
|
#define ROOM_LOW 0x1
|
|
#define ROOM_NORMAL 0x2
|
|
|
|
static bool __tpacket_has_room(struct packet_sock *po, int pow_off)
|
|
{
|
|
int idx, len;
|
|
|
|
len = po->rx_ring.frame_max + 1;
|
|
idx = po->rx_ring.head;
|
|
if (pow_off)
|
|
idx += len >> pow_off;
|
|
if (idx >= len)
|
|
idx -= len;
|
|
return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
|
|
}
|
|
|
|
static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off)
|
|
{
|
|
int idx, len;
|
|
|
|
len = po->rx_ring.prb_bdqc.knum_blocks;
|
|
idx = po->rx_ring.prb_bdqc.kactive_blk_num;
|
|
if (pow_off)
|
|
idx += len >> pow_off;
|
|
if (idx >= len)
|
|
idx -= len;
|
|
return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
|
|
}
|
|
|
|
static int __packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
|
|
{
|
|
struct sock *sk = &po->sk;
|
|
int ret = ROOM_NONE;
|
|
|
|
if (po->prot_hook.func != tpacket_rcv) {
|
|
int avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc)
|
|
- (skb ? skb->truesize : 0);
|
|
if (avail > (sk->sk_rcvbuf >> ROOM_POW_OFF))
|
|
return ROOM_NORMAL;
|
|
else if (avail > 0)
|
|
return ROOM_LOW;
|
|
else
|
|
return ROOM_NONE;
|
|
}
|
|
|
|
if (po->tp_version == TPACKET_V3) {
|
|
if (__tpacket_v3_has_room(po, ROOM_POW_OFF))
|
|
ret = ROOM_NORMAL;
|
|
else if (__tpacket_v3_has_room(po, 0))
|
|
ret = ROOM_LOW;
|
|
} else {
|
|
if (__tpacket_has_room(po, ROOM_POW_OFF))
|
|
ret = ROOM_NORMAL;
|
|
else if (__tpacket_has_room(po, 0))
|
|
ret = ROOM_LOW;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
|
|
{
|
|
int ret;
|
|
bool has_room;
|
|
|
|
spin_lock_bh(&po->sk.sk_receive_queue.lock);
|
|
ret = __packet_rcv_has_room(po, skb);
|
|
has_room = ret == ROOM_NORMAL;
|
|
if (po->pressure == has_room)
|
|
po->pressure = !has_room;
|
|
spin_unlock_bh(&po->sk.sk_receive_queue.lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void packet_sock_destruct(struct sock *sk)
|
|
{
|
|
skb_queue_purge(&sk->sk_error_queue);
|
|
|
|
WARN_ON(atomic_read(&sk->sk_rmem_alloc));
|
|
WARN_ON(atomic_read(&sk->sk_wmem_alloc));
|
|
|
|
if (!sock_flag(sk, SOCK_DEAD)) {
|
|
pr_err("Attempt to release alive packet socket: %p\n", sk);
|
|
return;
|
|
}
|
|
|
|
sk_refcnt_debug_dec(sk);
|
|
}
|
|
|
|
static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb)
|
|
{
|
|
u32 rxhash;
|
|
int i, count = 0;
|
|
|
|
rxhash = skb_get_hash(skb);
|
|
for (i = 0; i < ROLLOVER_HLEN; i++)
|
|
if (po->rollover->history[i] == rxhash)
|
|
count++;
|
|
|
|
po->rollover->history[prandom_u32() % ROLLOVER_HLEN] = rxhash;
|
|
return count > (ROLLOVER_HLEN >> 1);
|
|
}
|
|
|
|
static unsigned int fanout_demux_hash(struct packet_fanout *f,
|
|
struct sk_buff *skb,
|
|
unsigned int num)
|
|
{
|
|
return reciprocal_scale(__skb_get_hash_symmetric(skb), num);
|
|
}
|
|
|
|
static unsigned int fanout_demux_lb(struct packet_fanout *f,
|
|
struct sk_buff *skb,
|
|
unsigned int num)
|
|
{
|
|
unsigned int val = atomic_inc_return(&f->rr_cur);
|
|
|
|
return val % num;
|
|
}
|
|
|
|
static unsigned int fanout_demux_cpu(struct packet_fanout *f,
|
|
struct sk_buff *skb,
|
|
unsigned int num)
|
|
{
|
|
return smp_processor_id() % num;
|
|
}
|
|
|
|
static unsigned int fanout_demux_rnd(struct packet_fanout *f,
|
|
struct sk_buff *skb,
|
|
unsigned int num)
|
|
{
|
|
return prandom_u32_max(num);
|
|
}
|
|
|
|
static unsigned int fanout_demux_rollover(struct packet_fanout *f,
|
|
struct sk_buff *skb,
|
|
unsigned int idx, bool try_self,
|
|
unsigned int num)
|
|
{
|
|
struct packet_sock *po, *po_next, *po_skip = NULL;
|
|
unsigned int i, j, room = ROOM_NONE;
|
|
|
|
po = pkt_sk(f->arr[idx]);
|
|
|
|
if (try_self) {
|
|
room = packet_rcv_has_room(po, skb);
|
|
if (room == ROOM_NORMAL ||
|
|
(room == ROOM_LOW && !fanout_flow_is_huge(po, skb)))
|
|
return idx;
|
|
po_skip = po;
|
|
}
|
|
|
|
i = j = min_t(int, po->rollover->sock, num - 1);
|
|
do {
|
|
po_next = pkt_sk(f->arr[i]);
|
|
if (po_next != po_skip && !po_next->pressure &&
|
|
packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) {
|
|
if (i != j)
|
|
po->rollover->sock = i;
|
|
atomic_long_inc(&po->rollover->num);
|
|
if (room == ROOM_LOW)
|
|
atomic_long_inc(&po->rollover->num_huge);
|
|
return i;
|
|
}
|
|
|
|
if (++i == num)
|
|
i = 0;
|
|
} while (i != j);
|
|
|
|
atomic_long_inc(&po->rollover->num_failed);
|
|
return idx;
|
|
}
|
|
|
|
static unsigned int fanout_demux_qm(struct packet_fanout *f,
|
|
struct sk_buff *skb,
|
|
unsigned int num)
|
|
{
|
|
return skb_get_queue_mapping(skb) % num;
|
|
}
|
|
|
|
static unsigned int fanout_demux_bpf(struct packet_fanout *f,
|
|
struct sk_buff *skb,
|
|
unsigned int num)
|
|
{
|
|
struct bpf_prog *prog;
|
|
unsigned int ret = 0;
|
|
|
|
rcu_read_lock();
|
|
prog = rcu_dereference(f->bpf_prog);
|
|
if (prog)
|
|
ret = bpf_prog_run_clear_cb(prog, skb) % num;
|
|
rcu_read_unlock();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool fanout_has_flag(struct packet_fanout *f, u16 flag)
|
|
{
|
|
return f->flags & (flag >> 8);
|
|
}
|
|
|
|
static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
|
|
struct packet_type *pt, struct net_device *orig_dev)
|
|
{
|
|
struct packet_fanout *f = pt->af_packet_priv;
|
|
unsigned int num = READ_ONCE(f->num_members);
|
|
struct net *net = read_pnet(&f->net);
|
|
struct packet_sock *po;
|
|
unsigned int idx;
|
|
|
|
if (!net_eq(dev_net(dev), net) || !num) {
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) {
|
|
skb = ip_check_defrag(net, skb, IP_DEFRAG_AF_PACKET);
|
|
if (!skb)
|
|
return 0;
|
|
}
|
|
switch (f->type) {
|
|
case PACKET_FANOUT_HASH:
|
|
default:
|
|
idx = fanout_demux_hash(f, skb, num);
|
|
break;
|
|
case PACKET_FANOUT_LB:
|
|
idx = fanout_demux_lb(f, skb, num);
|
|
break;
|
|
case PACKET_FANOUT_CPU:
|
|
idx = fanout_demux_cpu(f, skb, num);
|
|
break;
|
|
case PACKET_FANOUT_RND:
|
|
idx = fanout_demux_rnd(f, skb, num);
|
|
break;
|
|
case PACKET_FANOUT_QM:
|
|
idx = fanout_demux_qm(f, skb, num);
|
|
break;
|
|
case PACKET_FANOUT_ROLLOVER:
|
|
idx = fanout_demux_rollover(f, skb, 0, false, num);
|
|
break;
|
|
case PACKET_FANOUT_CBPF:
|
|
case PACKET_FANOUT_EBPF:
|
|
idx = fanout_demux_bpf(f, skb, num);
|
|
break;
|
|
}
|
|
|
|
if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER))
|
|
idx = fanout_demux_rollover(f, skb, idx, true, num);
|
|
|
|
po = pkt_sk(f->arr[idx]);
|
|
return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
|
|
}
|
|
|
|
DEFINE_MUTEX(fanout_mutex);
|
|
EXPORT_SYMBOL_GPL(fanout_mutex);
|
|
static LIST_HEAD(fanout_list);
|
|
|
|
static void __fanout_link(struct sock *sk, struct packet_sock *po)
|
|
{
|
|
struct packet_fanout *f = po->fanout;
|
|
|
|
spin_lock(&f->lock);
|
|
f->arr[f->num_members] = sk;
|
|
smp_wmb();
|
|
f->num_members++;
|
|
spin_unlock(&f->lock);
|
|
}
|
|
|
|
static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
|
|
{
|
|
struct packet_fanout *f = po->fanout;
|
|
int i;
|
|
|
|
spin_lock(&f->lock);
|
|
for (i = 0; i < f->num_members; i++) {
|
|
if (f->arr[i] == sk)
|
|
break;
|
|
}
|
|
BUG_ON(i >= f->num_members);
|
|
f->arr[i] = f->arr[f->num_members - 1];
|
|
f->num_members--;
|
|
spin_unlock(&f->lock);
|
|
}
|
|
|
|
static bool match_fanout_group(struct packet_type *ptype, struct sock *sk)
|
|
{
|
|
if (sk->sk_family != PF_PACKET)
|
|
return false;
|
|
|
|
return ptype->af_packet_priv == pkt_sk(sk)->fanout;
|
|
}
|
|
|
|
static void fanout_init_data(struct packet_fanout *f)
|
|
{
|
|
switch (f->type) {
|
|
case PACKET_FANOUT_LB:
|
|
atomic_set(&f->rr_cur, 0);
|
|
break;
|
|
case PACKET_FANOUT_CBPF:
|
|
case PACKET_FANOUT_EBPF:
|
|
RCU_INIT_POINTER(f->bpf_prog, NULL);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new)
|
|
{
|
|
struct bpf_prog *old;
|
|
|
|
spin_lock(&f->lock);
|
|
old = rcu_dereference_protected(f->bpf_prog, lockdep_is_held(&f->lock));
|
|
rcu_assign_pointer(f->bpf_prog, new);
|
|
spin_unlock(&f->lock);
|
|
|
|
if (old) {
|
|
synchronize_net();
|
|
bpf_prog_destroy(old);
|
|
}
|
|
}
|
|
|
|
static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data,
|
|
unsigned int len)
|
|
{
|
|
struct bpf_prog *new;
|
|
struct sock_fprog fprog;
|
|
int ret;
|
|
|
|
if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
|
|
return -EPERM;
|
|
if (len != sizeof(fprog))
|
|
return -EINVAL;
|
|
if (copy_from_user(&fprog, data, len))
|
|
return -EFAULT;
|
|
|
|
ret = bpf_prog_create_from_user(&new, &fprog, NULL, false);
|
|
if (ret)
|
|
return ret;
|
|
|
|
__fanout_set_data_bpf(po->fanout, new);
|
|
return 0;
|
|
}
|
|
|
|
static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data,
|
|
unsigned int len)
|
|
{
|
|
struct bpf_prog *new;
|
|
u32 fd;
|
|
|
|
if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
|
|
return -EPERM;
|
|
if (len != sizeof(fd))
|
|
return -EINVAL;
|
|
if (copy_from_user(&fd, data, len))
|
|
return -EFAULT;
|
|
|
|
new = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER);
|
|
if (IS_ERR(new))
|
|
return PTR_ERR(new);
|
|
|
|
__fanout_set_data_bpf(po->fanout, new);
|
|
return 0;
|
|
}
|
|
|
|
static int fanout_set_data(struct packet_sock *po, char __user *data,
|
|
unsigned int len)
|
|
{
|
|
switch (po->fanout->type) {
|
|
case PACKET_FANOUT_CBPF:
|
|
return fanout_set_data_cbpf(po, data, len);
|
|
case PACKET_FANOUT_EBPF:
|
|
return fanout_set_data_ebpf(po, data, len);
|
|
default:
|
|
return -EINVAL;
|
|
};
|
|
}
|
|
|
|
static void fanout_release_data(struct packet_fanout *f)
|
|
{
|
|
switch (f->type) {
|
|
case PACKET_FANOUT_CBPF:
|
|
case PACKET_FANOUT_EBPF:
|
|
__fanout_set_data_bpf(f, NULL);
|
|
};
|
|
}
|
|
|
|
static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
|
|
{
|
|
struct packet_sock *po = pkt_sk(sk);
|
|
struct packet_fanout *f, *match;
|
|
u8 type = type_flags & 0xff;
|
|
u8 flags = type_flags >> 8;
|
|
int err;
|
|
|
|
switch (type) {
|
|
case PACKET_FANOUT_ROLLOVER:
|
|
if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)
|
|
return -EINVAL;
|
|
case PACKET_FANOUT_HASH:
|
|
case PACKET_FANOUT_LB:
|
|
case PACKET_FANOUT_CPU:
|
|
case PACKET_FANOUT_RND:
|
|
case PACKET_FANOUT_QM:
|
|
case PACKET_FANOUT_CBPF:
|
|
case PACKET_FANOUT_EBPF:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!po->running)
|
|
return -EINVAL;
|
|
|
|
if (po->fanout)
|
|
return -EALREADY;
|
|
|
|
if (type == PACKET_FANOUT_ROLLOVER ||
|
|
(type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) {
|
|
po->rollover = kzalloc(sizeof(*po->rollover), GFP_KERNEL);
|
|
if (!po->rollover)
|
|
return -ENOMEM;
|
|
atomic_long_set(&po->rollover->num, 0);
|
|
atomic_long_set(&po->rollover->num_huge, 0);
|
|
atomic_long_set(&po->rollover->num_failed, 0);
|
|
}
|
|
|
|
mutex_lock(&fanout_mutex);
|
|
match = NULL;
|
|
list_for_each_entry(f, &fanout_list, list) {
|
|
if (f->id == id &&
|
|
read_pnet(&f->net) == sock_net(sk)) {
|
|
match = f;
|
|
break;
|
|
}
|
|
}
|
|
err = -EINVAL;
|
|
if (match && match->flags != flags)
|
|
goto out;
|
|
if (!match) {
|
|
err = -ENOMEM;
|
|
match = kzalloc(sizeof(*match), GFP_KERNEL);
|
|
if (!match)
|
|
goto out;
|
|
write_pnet(&match->net, sock_net(sk));
|
|
match->id = id;
|
|
match->type = type;
|
|
match->flags = flags;
|
|
INIT_LIST_HEAD(&match->list);
|
|
spin_lock_init(&match->lock);
|
|
atomic_set(&match->sk_ref, 0);
|
|
fanout_init_data(match);
|
|
match->prot_hook.type = po->prot_hook.type;
|
|
match->prot_hook.dev = po->prot_hook.dev;
|
|
match->prot_hook.func = packet_rcv_fanout;
|
|
match->prot_hook.af_packet_priv = match;
|
|
match->prot_hook.id_match = match_fanout_group;
|
|
dev_add_pack(&match->prot_hook);
|
|
list_add(&match->list, &fanout_list);
|
|
}
|
|
err = -EINVAL;
|
|
if (match->type == type &&
|
|
match->prot_hook.type == po->prot_hook.type &&
|
|
match->prot_hook.dev == po->prot_hook.dev) {
|
|
err = -ENOSPC;
|
|
if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
|
|
__dev_remove_pack(&po->prot_hook);
|
|
po->fanout = match;
|
|
atomic_inc(&match->sk_ref);
|
|
__fanout_link(sk, po);
|
|
err = 0;
|
|
}
|
|
}
|
|
out:
|
|
mutex_unlock(&fanout_mutex);
|
|
if (err) {
|
|
kfree(po->rollover);
|
|
po->rollover = NULL;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static void fanout_release(struct sock *sk)
|
|
{
|
|
struct packet_sock *po = pkt_sk(sk);
|
|
struct packet_fanout *f;
|
|
|
|
f = po->fanout;
|
|
if (!f)
|
|
return;
|
|
|
|
mutex_lock(&fanout_mutex);
|
|
po->fanout = NULL;
|
|
|
|
if (atomic_dec_and_test(&f->sk_ref)) {
|
|
list_del(&f->list);
|
|
dev_remove_pack(&f->prot_hook);
|
|
fanout_release_data(f);
|
|
kfree(f);
|
|
}
|
|
mutex_unlock(&fanout_mutex);
|
|
|
|
if (po->rollover)
|
|
kfree_rcu(po->rollover, rcu);
|
|
}
|
|
|
|
static bool packet_extra_vlan_len_allowed(const struct net_device *dev,
|
|
struct sk_buff *skb)
|
|
{
|
|
/* Earlier code assumed this would be a VLAN pkt, double-check
|
|
* this now that we have the actual packet in hand. We can only
|
|
* do this check on Ethernet devices.
|
|
*/
|
|
if (unlikely(dev->type != ARPHRD_ETHER))
|
|
return false;
|
|
|
|
skb_reset_mac_header(skb);
|
|
return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q));
|
|
}
|
|
|
|
static const struct proto_ops packet_ops;
|
|
|
|
static const struct proto_ops packet_ops_spkt;
|
|
|
|
static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
|
|
struct packet_type *pt, struct net_device *orig_dev)
|
|
{
|
|
struct sock *sk;
|
|
struct sockaddr_pkt *spkt;
|
|
|
|
/*
|
|
* When we registered the protocol we saved the socket in the data
|
|
* field for just this event.
|
|
*/
|
|
|
|
sk = pt->af_packet_priv;
|
|
|
|
/*
|
|
* Yank back the headers [hope the device set this
|
|
* right or kerboom...]
|
|
*
|
|
* Incoming packets have ll header pulled,
|
|
* push it back.
|
|
*
|
|
* For outgoing ones skb->data == skb_mac_header(skb)
|
|
* so that this procedure is noop.
|
|
*/
|
|
|
|
if (skb->pkt_type == PACKET_LOOPBACK)
|
|
goto out;
|
|
|
|
if (!net_eq(dev_net(dev), sock_net(sk)))
|
|
goto out;
|
|
|
|
skb = skb_share_check(skb, GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
goto oom;
|
|
|
|
/* drop any routing info */
|
|
skb_dst_drop(skb);
|
|
|
|
/* drop conntrack reference */
|
|
nf_reset(skb);
|
|
|
|
spkt = &PACKET_SKB_CB(skb)->sa.pkt;
|
|
|
|
skb_push(skb, skb->data - skb_mac_header(skb));
|
|
|
|
/*
|
|
* The SOCK_PACKET socket receives _all_ frames.
|
|
*/
|
|
|
|
spkt->spkt_family = dev->type;
|
|
strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
|
|
spkt->spkt_protocol = skb->protocol;
|
|
|
|
/*
|
|
* Charge the memory to the socket. This is done specifically
|
|
* to prevent sockets using all the memory up.
|
|
*/
|
|
|
|
if (sock_queue_rcv_skb(sk, skb) == 0)
|
|
return 0;
|
|
|
|
out:
|
|
kfree_skb(skb);
|
|
oom:
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Output a raw packet to a device layer. This bypasses all the other
|
|
* protocol layers and you must therefore supply it with a complete frame
|
|
*/
|
|
|
|
static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
|
|
size_t len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
|
|
struct sk_buff *skb = NULL;
|
|
struct net_device *dev;
|
|
struct sockcm_cookie sockc;
|
|
__be16 proto = 0;
|
|
int err;
|
|
int extra_len = 0;
|
|
|
|
/*
|
|
* Get and verify the address.
|
|
*/
|
|
|
|
if (saddr) {
|
|
if (msg->msg_namelen < sizeof(struct sockaddr))
|
|
return -EINVAL;
|
|
if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
|
|
proto = saddr->spkt_protocol;
|
|
} else
|
|
return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
|
|
|
|
/*
|
|
* Find the device first to size check it
|
|
*/
|
|
|
|
saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0;
|
|
retry:
|
|
rcu_read_lock();
|
|
dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
|
|
err = -ENODEV;
|
|
if (dev == NULL)
|
|
goto out_unlock;
|
|
|
|
err = -ENETDOWN;
|
|
if (!(dev->flags & IFF_UP))
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* You may not queue a frame bigger than the mtu. This is the lowest level
|
|
* raw protocol and you must do your own fragmentation at this level.
|
|
*/
|
|
|
|
if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
|
|
if (!netif_supports_nofcs(dev)) {
|
|
err = -EPROTONOSUPPORT;
|
|
goto out_unlock;
|
|
}
|
|
extra_len = 4; /* We're doing our own CRC */
|
|
}
|
|
|
|
err = -EMSGSIZE;
|
|
if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len)
|
|
goto out_unlock;
|
|
|
|
if (!skb) {
|
|
size_t reserved = LL_RESERVED_SPACE(dev);
|
|
int tlen = dev->needed_tailroom;
|
|
unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
|
|
|
|
rcu_read_unlock();
|
|
skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
|
|
if (skb == NULL)
|
|
return -ENOBUFS;
|
|
/* FIXME: Save some space for broken drivers that write a hard
|
|
* header at transmission time by themselves. PPP is the notable
|
|
* one here. This should really be fixed at the driver level.
|
|
*/
|
|
skb_reserve(skb, reserved);
|
|
skb_reset_network_header(skb);
|
|
|
|
/* Try to align data part correctly */
|
|
if (hhlen) {
|
|
skb->data -= hhlen;
|
|
skb->tail -= hhlen;
|
|
if (len < hhlen)
|
|
skb_reset_network_header(skb);
|
|
}
|
|
err = memcpy_from_msg(skb_put(skb, len), msg, len);
|
|
if (err)
|
|
goto out_free;
|
|
goto retry;
|
|
}
|
|
|
|
if (!dev_validate_header(dev, skb->data, len)) {
|
|
err = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
if (len > (dev->mtu + dev->hard_header_len + extra_len) &&
|
|
!packet_extra_vlan_len_allowed(dev, skb)) {
|
|
err = -EMSGSIZE;
|
|
goto out_unlock;
|
|
}
|
|
|
|
sockc.tsflags = sk->sk_tsflags;
|
|
if (msg->msg_controllen) {
|
|
err = sock_cmsg_send(sk, msg, &sockc);
|
|
if (unlikely(err))
|
|
goto out_unlock;
|
|
}
|
|
|
|
skb->protocol = proto;
|
|
skb->dev = dev;
|
|
skb->priority = sk->sk_priority;
|
|
skb->mark = sk->sk_mark;
|
|
|
|
sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
|
|
|
|
if (unlikely(extra_len == 4))
|
|
skb->no_fcs = 1;
|
|
|
|
skb_probe_transport_header(skb, 0);
|
|
|
|
dev_queue_xmit(skb);
|
|
rcu_read_unlock();
|
|
return len;
|
|
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
out_free:
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
static unsigned int run_filter(struct sk_buff *skb,
|
|
const struct sock *sk,
|
|
unsigned int res)
|
|
{
|
|
struct sk_filter *filter;
|
|
|
|
rcu_read_lock();
|
|
filter = rcu_dereference(sk->sk_filter);
|
|
if (filter != NULL)
|
|
res = bpf_prog_run_clear_cb(filter->prog, skb);
|
|
rcu_read_unlock();
|
|
|
|
return res;
|
|
}
|
|
|
|
static int __packet_rcv_vnet(const struct sk_buff *skb,
|
|
struct virtio_net_hdr *vnet_hdr)
|
|
{
|
|
*vnet_hdr = (const struct virtio_net_hdr) { 0 };
|
|
|
|
if (virtio_net_hdr_from_skb(skb, vnet_hdr, vio_le()))
|
|
BUG();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb,
|
|
size_t *len)
|
|
{
|
|
struct virtio_net_hdr vnet_hdr;
|
|
|
|
if (*len < sizeof(vnet_hdr))
|
|
return -EINVAL;
|
|
*len -= sizeof(vnet_hdr);
|
|
|
|
if (__packet_rcv_vnet(skb, &vnet_hdr))
|
|
return -EINVAL;
|
|
|
|
return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr));
|
|
}
|
|
|
|
/*
|
|
* This function makes lazy skb cloning in hope that most of packets
|
|
* are discarded by BPF.
|
|
*
|
|
* Note tricky part: we DO mangle shared skb! skb->data, skb->len
|
|
* and skb->cb are mangled. It works because (and until) packets
|
|
* falling here are owned by current CPU. Output packets are cloned
|
|
* by dev_queue_xmit_nit(), input packets are processed by net_bh
|
|
* sequencially, so that if we return skb to original state on exit,
|
|
* we will not harm anyone.
|
|
*/
|
|
|
|
static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
|
|
struct packet_type *pt, struct net_device *orig_dev)
|
|
{
|
|
struct sock *sk;
|
|
struct sockaddr_ll *sll;
|
|
struct packet_sock *po;
|
|
u8 *skb_head = skb->data;
|
|
int skb_len = skb->len;
|
|
unsigned int snaplen, res;
|
|
bool is_drop_n_account = false;
|
|
|
|
if (skb->pkt_type == PACKET_LOOPBACK)
|
|
goto drop;
|
|
|
|
sk = pt->af_packet_priv;
|
|
po = pkt_sk(sk);
|
|
|
|
if (!net_eq(dev_net(dev), sock_net(sk)))
|
|
goto drop;
|
|
|
|
skb->dev = dev;
|
|
|
|
if (dev->header_ops) {
|
|
/* The device has an explicit notion of ll header,
|
|
* exported to higher levels.
|
|
*
|
|
* Otherwise, the device hides details of its frame
|
|
* structure, so that corresponding packet head is
|
|
* never delivered to user.
|
|
*/
|
|
if (sk->sk_type != SOCK_DGRAM)
|
|
skb_push(skb, skb->data - skb_mac_header(skb));
|
|
else if (skb->pkt_type == PACKET_OUTGOING) {
|
|
/* Special case: outgoing packets have ll header at head */
|
|
skb_pull(skb, skb_network_offset(skb));
|
|
}
|
|
}
|
|
|
|
snaplen = skb->len;
|
|
|
|
res = run_filter(skb, sk, snaplen);
|
|
if (!res)
|
|
goto drop_n_restore;
|
|
if (snaplen > res)
|
|
snaplen = res;
|
|
|
|
if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
|
|
goto drop_n_acct;
|
|
|
|
if (skb_shared(skb)) {
|
|
struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
|
|
if (nskb == NULL)
|
|
goto drop_n_acct;
|
|
|
|
if (skb_head != skb->data) {
|
|
skb->data = skb_head;
|
|
skb->len = skb_len;
|
|
}
|
|
consume_skb(skb);
|
|
skb = nskb;
|
|
}
|
|
|
|
sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8);
|
|
|
|
sll = &PACKET_SKB_CB(skb)->sa.ll;
|
|
sll->sll_hatype = dev->type;
|
|
sll->sll_pkttype = skb->pkt_type;
|
|
if (unlikely(po->origdev))
|
|
sll->sll_ifindex = orig_dev->ifindex;
|
|
else
|
|
sll->sll_ifindex = dev->ifindex;
|
|
|
|
sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
|
|
|
|
/* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
|
|
* Use their space for storing the original skb length.
|
|
*/
|
|
PACKET_SKB_CB(skb)->sa.origlen = skb->len;
|
|
|
|
if (pskb_trim(skb, snaplen))
|
|
goto drop_n_acct;
|
|
|
|
skb_set_owner_r(skb, sk);
|
|
skb->dev = NULL;
|
|
skb_dst_drop(skb);
|
|
|
|
/* drop conntrack reference */
|
|
nf_reset(skb);
|
|
|
|
spin_lock(&sk->sk_receive_queue.lock);
|
|
po->stats.stats1.tp_packets++;
|
|
sock_skb_set_dropcount(sk, skb);
|
|
__skb_queue_tail(&sk->sk_receive_queue, skb);
|
|
spin_unlock(&sk->sk_receive_queue.lock);
|
|
sk->sk_data_ready(sk);
|
|
return 0;
|
|
|
|
drop_n_acct:
|
|
is_drop_n_account = true;
|
|
spin_lock(&sk->sk_receive_queue.lock);
|
|
po->stats.stats1.tp_drops++;
|
|
atomic_inc(&sk->sk_drops);
|
|
spin_unlock(&sk->sk_receive_queue.lock);
|
|
|
|
drop_n_restore:
|
|
if (skb_head != skb->data && skb_shared(skb)) {
|
|
skb->data = skb_head;
|
|
skb->len = skb_len;
|
|
}
|
|
drop:
|
|
if (!is_drop_n_account)
|
|
consume_skb(skb);
|
|
else
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
|
|
struct packet_type *pt, struct net_device *orig_dev)
|
|
{
|
|
struct sock *sk;
|
|
struct packet_sock *po;
|
|
struct sockaddr_ll *sll;
|
|
union tpacket_uhdr h;
|
|
u8 *skb_head = skb->data;
|
|
int skb_len = skb->len;
|
|
unsigned int snaplen, res;
|
|
unsigned long status = TP_STATUS_USER;
|
|
unsigned short macoff, netoff, hdrlen;
|
|
struct sk_buff *copy_skb = NULL;
|
|
struct timespec ts;
|
|
__u32 ts_status;
|
|
bool is_drop_n_account = false;
|
|
|
|
/* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
|
|
* We may add members to them until current aligned size without forcing
|
|
* userspace to call getsockopt(..., PACKET_HDRLEN, ...).
|
|
*/
|
|
BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
|
|
BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
|
|
|
|
if (skb->pkt_type == PACKET_LOOPBACK)
|
|
goto drop;
|
|
|
|
sk = pt->af_packet_priv;
|
|
po = pkt_sk(sk);
|
|
|
|
if (!net_eq(dev_net(dev), sock_net(sk)))
|
|
goto drop;
|
|
|
|
if (dev->header_ops) {
|
|
if (sk->sk_type != SOCK_DGRAM)
|
|
skb_push(skb, skb->data - skb_mac_header(skb));
|
|
else if (skb->pkt_type == PACKET_OUTGOING) {
|
|
/* Special case: outgoing packets have ll header at head */
|
|
skb_pull(skb, skb_network_offset(skb));
|
|
}
|
|
}
|
|
|
|
snaplen = skb->len;
|
|
|
|
res = run_filter(skb, sk, snaplen);
|
|
if (!res)
|
|
goto drop_n_restore;
|
|
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL)
|
|
status |= TP_STATUS_CSUMNOTREADY;
|
|
else if (skb->pkt_type != PACKET_OUTGOING &&
|
|
(skb->ip_summed == CHECKSUM_COMPLETE ||
|
|
skb_csum_unnecessary(skb)))
|
|
status |= TP_STATUS_CSUM_VALID;
|
|
|
|
if (snaplen > res)
|
|
snaplen = res;
|
|
|
|
if (sk->sk_type == SOCK_DGRAM) {
|
|
macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
|
|
po->tp_reserve;
|
|
} else {
|
|
unsigned int maclen = skb_network_offset(skb);
|
|
netoff = TPACKET_ALIGN(po->tp_hdrlen +
|
|
(maclen < 16 ? 16 : maclen)) +
|
|
po->tp_reserve;
|
|
if (po->has_vnet_hdr)
|
|
netoff += sizeof(struct virtio_net_hdr);
|
|
macoff = netoff - maclen;
|
|
}
|
|
if (po->tp_version <= TPACKET_V2) {
|
|
if (macoff + snaplen > po->rx_ring.frame_size) {
|
|
if (po->copy_thresh &&
|
|
atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
|
|
if (skb_shared(skb)) {
|
|
copy_skb = skb_clone(skb, GFP_ATOMIC);
|
|
} else {
|
|
copy_skb = skb_get(skb);
|
|
skb_head = skb->data;
|
|
}
|
|
if (copy_skb)
|
|
skb_set_owner_r(copy_skb, sk);
|
|
}
|
|
snaplen = po->rx_ring.frame_size - macoff;
|
|
if ((int)snaplen < 0)
|
|
snaplen = 0;
|
|
}
|
|
} else if (unlikely(macoff + snaplen >
|
|
GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) {
|
|
u32 nval;
|
|
|
|
nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff;
|
|
pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
|
|
snaplen, nval, macoff);
|
|
snaplen = nval;
|
|
if (unlikely((int)snaplen < 0)) {
|
|
snaplen = 0;
|
|
macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len;
|
|
}
|
|
}
|
|
spin_lock(&sk->sk_receive_queue.lock);
|
|
h.raw = packet_current_rx_frame(po, skb,
|
|
TP_STATUS_KERNEL, (macoff+snaplen));
|
|
if (!h.raw)
|
|
goto drop_n_account;
|
|
if (po->tp_version <= TPACKET_V2) {
|
|
packet_increment_rx_head(po, &po->rx_ring);
|
|
/*
|
|
* LOSING will be reported till you read the stats,
|
|
* because it's COR - Clear On Read.
|
|
* Anyways, moving it for V1/V2 only as V3 doesn't need this
|
|
* at packet level.
|
|
*/
|
|
if (po->stats.stats1.tp_drops)
|
|
status |= TP_STATUS_LOSING;
|
|
}
|
|
po->stats.stats1.tp_packets++;
|
|
if (copy_skb) {
|
|
status |= TP_STATUS_COPY;
|
|
__skb_queue_tail(&sk->sk_receive_queue, copy_skb);
|
|
}
|
|
spin_unlock(&sk->sk_receive_queue.lock);
|
|
|
|
if (po->has_vnet_hdr) {
|
|
if (__packet_rcv_vnet(skb, h.raw + macoff -
|
|
sizeof(struct virtio_net_hdr))) {
|
|
spin_lock(&sk->sk_receive_queue.lock);
|
|
goto drop_n_account;
|
|
}
|
|
}
|
|
|
|
skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
|
|
|
|
if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
|
|
getnstimeofday(&ts);
|
|
|
|
status |= ts_status;
|
|
|
|
switch (po->tp_version) {
|
|
case TPACKET_V1:
|
|
h.h1->tp_len = skb->len;
|
|
h.h1->tp_snaplen = snaplen;
|
|
h.h1->tp_mac = macoff;
|
|
h.h1->tp_net = netoff;
|
|
h.h1->tp_sec = ts.tv_sec;
|
|
h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
|
|
hdrlen = sizeof(*h.h1);
|
|
break;
|
|
case TPACKET_V2:
|
|
h.h2->tp_len = skb->len;
|
|
h.h2->tp_snaplen = snaplen;
|
|
h.h2->tp_mac = macoff;
|
|
h.h2->tp_net = netoff;
|
|
h.h2->tp_sec = ts.tv_sec;
|
|
h.h2->tp_nsec = ts.tv_nsec;
|
|
if (skb_vlan_tag_present(skb)) {
|
|
h.h2->tp_vlan_tci = skb_vlan_tag_get(skb);
|
|
h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
|
|
status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
|
|
} else {
|
|
h.h2->tp_vlan_tci = 0;
|
|
h.h2->tp_vlan_tpid = 0;
|
|
}
|
|
memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding));
|
|
hdrlen = sizeof(*h.h2);
|
|
break;
|
|
case TPACKET_V3:
|
|
/* tp_nxt_offset,vlan are already populated above.
|
|
* So DONT clear those fields here
|
|
*/
|
|
h.h3->tp_status |= status;
|
|
h.h3->tp_len = skb->len;
|
|
h.h3->tp_snaplen = snaplen;
|
|
h.h3->tp_mac = macoff;
|
|
h.h3->tp_net = netoff;
|
|
h.h3->tp_sec = ts.tv_sec;
|
|
h.h3->tp_nsec = ts.tv_nsec;
|
|
memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding));
|
|
hdrlen = sizeof(*h.h3);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
sll = h.raw + TPACKET_ALIGN(hdrlen);
|
|
sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
|
|
sll->sll_family = AF_PACKET;
|
|
sll->sll_hatype = dev->type;
|
|
sll->sll_protocol = skb->protocol;
|
|
sll->sll_pkttype = skb->pkt_type;
|
|
if (unlikely(po->origdev))
|
|
sll->sll_ifindex = orig_dev->ifindex;
|
|
else
|
|
sll->sll_ifindex = dev->ifindex;
|
|
|
|
smp_mb();
|
|
|
|
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
|
|
if (po->tp_version <= TPACKET_V2) {
|
|
u8 *start, *end;
|
|
|
|
end = (u8 *) PAGE_ALIGN((unsigned long) h.raw +
|
|
macoff + snaplen);
|
|
|
|
for (start = h.raw; start < end; start += PAGE_SIZE)
|
|
flush_dcache_page(pgv_to_page(start));
|
|
}
|
|
smp_wmb();
|
|
#endif
|
|
|
|
if (po->tp_version <= TPACKET_V2) {
|
|
__packet_set_status(po, h.raw, status);
|
|
sk->sk_data_ready(sk);
|
|
} else {
|
|
prb_clear_blk_fill_status(&po->rx_ring);
|
|
}
|
|
|
|
drop_n_restore:
|
|
if (skb_head != skb->data && skb_shared(skb)) {
|
|
skb->data = skb_head;
|
|
skb->len = skb_len;
|
|
}
|
|
drop:
|
|
if (!is_drop_n_account)
|
|
consume_skb(skb);
|
|
else
|
|
kfree_skb(skb);
|
|
return 0;
|
|
|
|
drop_n_account:
|
|
is_drop_n_account = true;
|
|
po->stats.stats1.tp_drops++;
|
|
spin_unlock(&sk->sk_receive_queue.lock);
|
|
|
|
sk->sk_data_ready(sk);
|
|
kfree_skb(copy_skb);
|
|
goto drop_n_restore;
|
|
}
|
|
|
|
static void tpacket_destruct_skb(struct sk_buff *skb)
|
|
{
|
|
struct packet_sock *po = pkt_sk(skb->sk);
|
|
|
|
if (likely(po->tx_ring.pg_vec)) {
|
|
void *ph;
|
|
__u32 ts;
|
|
|
|
ph = skb_shinfo(skb)->destructor_arg;
|
|
packet_dec_pending(&po->tx_ring);
|
|
|
|
ts = __packet_set_timestamp(po, ph, skb);
|
|
__packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
|
|
}
|
|
|
|
sock_wfree(skb);
|
|
}
|
|
|
|
static void tpacket_set_protocol(const struct net_device *dev,
|
|
struct sk_buff *skb)
|
|
{
|
|
if (dev->type == ARPHRD_ETHER) {
|
|
skb_reset_mac_header(skb);
|
|
skb->protocol = eth_hdr(skb)->h_proto;
|
|
}
|
|
}
|
|
|
|
static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len)
|
|
{
|
|
unsigned short gso_type = 0;
|
|
|
|
if ((vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
|
|
(__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
|
|
__virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2 >
|
|
__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len)))
|
|
vnet_hdr->hdr_len = __cpu_to_virtio16(vio_le(),
|
|
__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
|
|
__virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2);
|
|
|
|
if (__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len) > len)
|
|
return -EINVAL;
|
|
|
|
if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
|
|
switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
|
|
case VIRTIO_NET_HDR_GSO_TCPV4:
|
|
gso_type = SKB_GSO_TCPV4;
|
|
break;
|
|
case VIRTIO_NET_HDR_GSO_TCPV6:
|
|
gso_type = SKB_GSO_TCPV6;
|
|
break;
|
|
case VIRTIO_NET_HDR_GSO_UDP:
|
|
gso_type = SKB_GSO_UDP;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
|
|
gso_type |= SKB_GSO_TCP_ECN;
|
|
|
|
if (vnet_hdr->gso_size == 0)
|
|
return -EINVAL;
|
|
}
|
|
|
|
vnet_hdr->gso_type = gso_type; /* changes type, temporary storage */
|
|
return 0;
|
|
}
|
|
|
|
static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len,
|
|
struct virtio_net_hdr *vnet_hdr)
|
|
{
|
|
int n;
|
|
|
|
if (*len < sizeof(*vnet_hdr))
|
|
return -EINVAL;
|
|
*len -= sizeof(*vnet_hdr);
|
|
|
|
n = copy_from_iter(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter);
|
|
if (n != sizeof(*vnet_hdr))
|
|
return -EFAULT;
|
|
|
|
return __packet_snd_vnet_parse(vnet_hdr, *len);
|
|
}
|
|
|
|
static int packet_snd_vnet_gso(struct sk_buff *skb,
|
|
struct virtio_net_hdr *vnet_hdr)
|
|
{
|
|
if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
|
|
u16 s = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start);
|
|
u16 o = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset);
|
|
|
|
if (!skb_partial_csum_set(skb, s, o))
|
|
return -EINVAL;
|
|
}
|
|
|
|
skb_shinfo(skb)->gso_size =
|
|
__virtio16_to_cpu(vio_le(), vnet_hdr->gso_size);
|
|
skb_shinfo(skb)->gso_type = vnet_hdr->gso_type;
|
|
|
|
/* Header must be checked, and gso_segs computed. */
|
|
skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
|
|
skb_shinfo(skb)->gso_segs = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
|
|
void *frame, struct net_device *dev, void *data, int tp_len,
|
|
__be16 proto, unsigned char *addr, int hlen, int copylen,
|
|
const struct sockcm_cookie *sockc)
|
|
{
|
|
union tpacket_uhdr ph;
|
|
int to_write, offset, len, nr_frags, len_max;
|
|
struct socket *sock = po->sk.sk_socket;
|
|
struct page *page;
|
|
int err;
|
|
|
|
ph.raw = frame;
|
|
|
|
skb->protocol = proto;
|
|
skb->dev = dev;
|
|
skb->priority = po->sk.sk_priority;
|
|
skb->mark = po->sk.sk_mark;
|
|
sock_tx_timestamp(&po->sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
|
|
skb_shinfo(skb)->destructor_arg = ph.raw;
|
|
|
|
skb_reserve(skb, hlen);
|
|
skb_reset_network_header(skb);
|
|
|
|
to_write = tp_len;
|
|
|
|
if (sock->type == SOCK_DGRAM) {
|
|
err = dev_hard_header(skb, dev, ntohs(proto), addr,
|
|
NULL, tp_len);
|
|
if (unlikely(err < 0))
|
|
return -EINVAL;
|
|
} else if (copylen) {
|
|
int hdrlen = min_t(int, copylen, tp_len);
|
|
|
|
skb_push(skb, dev->hard_header_len);
|
|
skb_put(skb, copylen - dev->hard_header_len);
|
|
err = skb_store_bits(skb, 0, data, hdrlen);
|
|
if (unlikely(err))
|
|
return err;
|
|
if (!dev_validate_header(dev, skb->data, hdrlen))
|
|
return -EINVAL;
|
|
if (!skb->protocol)
|
|
tpacket_set_protocol(dev, skb);
|
|
|
|
data += hdrlen;
|
|
to_write -= hdrlen;
|
|
}
|
|
|
|
offset = offset_in_page(data);
|
|
len_max = PAGE_SIZE - offset;
|
|
len = ((to_write > len_max) ? len_max : to_write);
|
|
|
|
skb->data_len = to_write;
|
|
skb->len += to_write;
|
|
skb->truesize += to_write;
|
|
atomic_add(to_write, &po->sk.sk_wmem_alloc);
|
|
|
|
while (likely(to_write)) {
|
|
nr_frags = skb_shinfo(skb)->nr_frags;
|
|
|
|
if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
|
|
pr_err("Packet exceed the number of skb frags(%lu)\n",
|
|
MAX_SKB_FRAGS);
|
|
return -EFAULT;
|
|
}
|
|
|
|
page = pgv_to_page(data);
|
|
data += len;
|
|
flush_dcache_page(page);
|
|
get_page(page);
|
|
skb_fill_page_desc(skb, nr_frags, page, offset, len);
|
|
to_write -= len;
|
|
offset = 0;
|
|
len_max = PAGE_SIZE;
|
|
len = ((to_write > len_max) ? len_max : to_write);
|
|
}
|
|
|
|
skb_probe_transport_header(skb, 0);
|
|
|
|
return tp_len;
|
|
}
|
|
|
|
static int tpacket_parse_header(struct packet_sock *po, void *frame,
|
|
int size_max, void **data)
|
|
{
|
|
union tpacket_uhdr ph;
|
|
int tp_len, off;
|
|
|
|
ph.raw = frame;
|
|
|
|
switch (po->tp_version) {
|
|
case TPACKET_V2:
|
|
tp_len = ph.h2->tp_len;
|
|
break;
|
|
default:
|
|
tp_len = ph.h1->tp_len;
|
|
break;
|
|
}
|
|
if (unlikely(tp_len > size_max)) {
|
|
pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
if (unlikely(po->tp_tx_has_off)) {
|
|
int off_min, off_max;
|
|
|
|
off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll);
|
|
off_max = po->tx_ring.frame_size - tp_len;
|
|
if (po->sk.sk_type == SOCK_DGRAM) {
|
|
switch (po->tp_version) {
|
|
case TPACKET_V2:
|
|
off = ph.h2->tp_net;
|
|
break;
|
|
default:
|
|
off = ph.h1->tp_net;
|
|
break;
|
|
}
|
|
} else {
|
|
switch (po->tp_version) {
|
|
case TPACKET_V2:
|
|
off = ph.h2->tp_mac;
|
|
break;
|
|
default:
|
|
off = ph.h1->tp_mac;
|
|
break;
|
|
}
|
|
}
|
|
if (unlikely((off < off_min) || (off_max < off)))
|
|
return -EINVAL;
|
|
} else {
|
|
off = po->tp_hdrlen - sizeof(struct sockaddr_ll);
|
|
}
|
|
|
|
*data = frame + off;
|
|
return tp_len;
|
|
}
|
|
|
|
static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct net_device *dev;
|
|
struct virtio_net_hdr *vnet_hdr = NULL;
|
|
struct sockcm_cookie sockc;
|
|
__be16 proto;
|
|
int err, reserve = 0;
|
|
void *ph;
|
|
DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
|
|
bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
|
|
int tp_len, size_max;
|
|
unsigned char *addr;
|
|
void *data;
|
|
int len_sum = 0;
|
|
int status = TP_STATUS_AVAILABLE;
|
|
int hlen, tlen, copylen = 0;
|
|
|
|
mutex_lock(&po->pg_vec_lock);
|
|
|
|
if (likely(saddr == NULL)) {
|
|
dev = packet_cached_dev_get(po);
|
|
proto = po->num;
|
|
addr = NULL;
|
|
} else {
|
|
err = -EINVAL;
|
|
if (msg->msg_namelen < sizeof(struct sockaddr_ll))
|
|
goto out;
|
|
if (msg->msg_namelen < (saddr->sll_halen
|
|
+ offsetof(struct sockaddr_ll,
|
|
sll_addr)))
|
|
goto out;
|
|
proto = saddr->sll_protocol;
|
|
addr = saddr->sll_addr;
|
|
dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
|
|
}
|
|
|
|
sockc.tsflags = po->sk.sk_tsflags;
|
|
if (msg->msg_controllen) {
|
|
err = sock_cmsg_send(&po->sk, msg, &sockc);
|
|
if (unlikely(err))
|
|
goto out;
|
|
}
|
|
|
|
err = -ENXIO;
|
|
if (unlikely(dev == NULL))
|
|
goto out;
|
|
err = -ENETDOWN;
|
|
if (unlikely(!(dev->flags & IFF_UP)))
|
|
goto out_put;
|
|
|
|
if (po->sk.sk_socket->type == SOCK_RAW)
|
|
reserve = dev->hard_header_len;
|
|
size_max = po->tx_ring.frame_size
|
|
- (po->tp_hdrlen - sizeof(struct sockaddr_ll));
|
|
|
|
if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr)
|
|
size_max = dev->mtu + reserve + VLAN_HLEN;
|
|
|
|
do {
|
|
ph = packet_current_frame(po, &po->tx_ring,
|
|
TP_STATUS_SEND_REQUEST);
|
|
if (unlikely(ph == NULL)) {
|
|
if (need_wait && need_resched())
|
|
schedule();
|
|
continue;
|
|
}
|
|
|
|
skb = NULL;
|
|
tp_len = tpacket_parse_header(po, ph, size_max, &data);
|
|
if (tp_len < 0)
|
|
goto tpacket_error;
|
|
|
|
status = TP_STATUS_SEND_REQUEST;
|
|
hlen = LL_RESERVED_SPACE(dev);
|
|
tlen = dev->needed_tailroom;
|
|
if (po->has_vnet_hdr) {
|
|
vnet_hdr = data;
|
|
data += sizeof(*vnet_hdr);
|
|
tp_len -= sizeof(*vnet_hdr);
|
|
if (tp_len < 0 ||
|
|
__packet_snd_vnet_parse(vnet_hdr, tp_len)) {
|
|
tp_len = -EINVAL;
|
|
goto tpacket_error;
|
|
}
|
|
copylen = __virtio16_to_cpu(vio_le(),
|
|
vnet_hdr->hdr_len);
|
|
}
|
|
copylen = max_t(int, copylen, dev->hard_header_len);
|
|
skb = sock_alloc_send_skb(&po->sk,
|
|
hlen + tlen + sizeof(struct sockaddr_ll) +
|
|
(copylen - dev->hard_header_len),
|
|
!need_wait, &err);
|
|
|
|
if (unlikely(skb == NULL)) {
|
|
/* we assume the socket was initially writeable ... */
|
|
if (likely(len_sum > 0))
|
|
err = len_sum;
|
|
goto out_status;
|
|
}
|
|
tp_len = tpacket_fill_skb(po, skb, ph, dev, data, tp_len, proto,
|
|
addr, hlen, copylen, &sockc);
|
|
if (likely(tp_len >= 0) &&
|
|
tp_len > dev->mtu + reserve &&
|
|
!po->has_vnet_hdr &&
|
|
!packet_extra_vlan_len_allowed(dev, skb))
|
|
tp_len = -EMSGSIZE;
|
|
|
|
if (unlikely(tp_len < 0)) {
|
|
tpacket_error:
|
|
if (po->tp_loss) {
|
|
__packet_set_status(po, ph,
|
|
TP_STATUS_AVAILABLE);
|
|
packet_increment_head(&po->tx_ring);
|
|
kfree_skb(skb);
|
|
continue;
|
|
} else {
|
|
status = TP_STATUS_WRONG_FORMAT;
|
|
err = tp_len;
|
|
goto out_status;
|
|
}
|
|
}
|
|
|
|
if (po->has_vnet_hdr && packet_snd_vnet_gso(skb, vnet_hdr)) {
|
|
tp_len = -EINVAL;
|
|
goto tpacket_error;
|
|
}
|
|
|
|
packet_pick_tx_queue(dev, skb);
|
|
|
|
skb->destructor = tpacket_destruct_skb;
|
|
__packet_set_status(po, ph, TP_STATUS_SENDING);
|
|
packet_inc_pending(&po->tx_ring);
|
|
|
|
status = TP_STATUS_SEND_REQUEST;
|
|
err = po->xmit(skb);
|
|
if (unlikely(err > 0)) {
|
|
err = net_xmit_errno(err);
|
|
if (err && __packet_get_status(po, ph) ==
|
|
TP_STATUS_AVAILABLE) {
|
|
/* skb was destructed already */
|
|
skb = NULL;
|
|
goto out_status;
|
|
}
|
|
/*
|
|
* skb was dropped but not destructed yet;
|
|
* let's treat it like congestion or err < 0
|
|
*/
|
|
err = 0;
|
|
}
|
|
packet_increment_head(&po->tx_ring);
|
|
len_sum += tp_len;
|
|
} while (likely((ph != NULL) ||
|
|
/* Note: packet_read_pending() might be slow if we have
|
|
* to call it as it's per_cpu variable, but in fast-path
|
|
* we already short-circuit the loop with the first
|
|
* condition, and luckily don't have to go that path
|
|
* anyway.
|
|
*/
|
|
(need_wait && packet_read_pending(&po->tx_ring))));
|
|
|
|
err = len_sum;
|
|
goto out_put;
|
|
|
|
out_status:
|
|
__packet_set_status(po, ph, status);
|
|
kfree_skb(skb);
|
|
out_put:
|
|
dev_put(dev);
|
|
out:
|
|
mutex_unlock(&po->pg_vec_lock);
|
|
return err;
|
|
}
|
|
|
|
static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
|
|
size_t reserve, size_t len,
|
|
size_t linear, int noblock,
|
|
int *err)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
/* Under a page? Don't bother with paged skb. */
|
|
if (prepad + len < PAGE_SIZE || !linear)
|
|
linear = len;
|
|
|
|
skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
|
|
err, 0);
|
|
if (!skb)
|
|
return NULL;
|
|
|
|
skb_reserve(skb, reserve);
|
|
skb_put(skb, linear);
|
|
skb->data_len = len - linear;
|
|
skb->len += len - linear;
|
|
|
|
return skb;
|
|
}
|
|
|
|
static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
|
|
struct sk_buff *skb;
|
|
struct net_device *dev;
|
|
__be16 proto;
|
|
unsigned char *addr;
|
|
int err, reserve = 0;
|
|
struct sockcm_cookie sockc;
|
|
struct virtio_net_hdr vnet_hdr = { 0 };
|
|
int offset = 0;
|
|
struct packet_sock *po = pkt_sk(sk);
|
|
int hlen, tlen;
|
|
int extra_len = 0;
|
|
|
|
/*
|
|
* Get and verify the address.
|
|
*/
|
|
|
|
if (likely(saddr == NULL)) {
|
|
dev = packet_cached_dev_get(po);
|
|
proto = po->num;
|
|
addr = NULL;
|
|
} else {
|
|
err = -EINVAL;
|
|
if (msg->msg_namelen < sizeof(struct sockaddr_ll))
|
|
goto out;
|
|
if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
|
|
goto out;
|
|
proto = saddr->sll_protocol;
|
|
addr = saddr->sll_addr;
|
|
dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
|
|
}
|
|
|
|
err = -ENXIO;
|
|
if (unlikely(dev == NULL))
|
|
goto out_unlock;
|
|
err = -ENETDOWN;
|
|
if (unlikely(!(dev->flags & IFF_UP)))
|
|
goto out_unlock;
|
|
|
|
sockc.tsflags = sk->sk_tsflags;
|
|
sockc.mark = sk->sk_mark;
|
|
if (msg->msg_controllen) {
|
|
err = sock_cmsg_send(sk, msg, &sockc);
|
|
if (unlikely(err))
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (sock->type == SOCK_RAW)
|
|
reserve = dev->hard_header_len;
|
|
if (po->has_vnet_hdr) {
|
|
err = packet_snd_vnet_parse(msg, &len, &vnet_hdr);
|
|
if (err)
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
|
|
if (!netif_supports_nofcs(dev)) {
|
|
err = -EPROTONOSUPPORT;
|
|
goto out_unlock;
|
|
}
|
|
extra_len = 4; /* We're doing our own CRC */
|
|
}
|
|
|
|
err = -EMSGSIZE;
|
|
if (!vnet_hdr.gso_type &&
|
|
(len > dev->mtu + reserve + VLAN_HLEN + extra_len))
|
|
goto out_unlock;
|
|
|
|
err = -ENOBUFS;
|
|
hlen = LL_RESERVED_SPACE(dev);
|
|
tlen = dev->needed_tailroom;
|
|
skb = packet_alloc_skb(sk, hlen + tlen, hlen, len,
|
|
__virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len),
|
|
msg->msg_flags & MSG_DONTWAIT, &err);
|
|
if (skb == NULL)
|
|
goto out_unlock;
|
|
|
|
skb_set_network_header(skb, reserve);
|
|
|
|
err = -EINVAL;
|
|
if (sock->type == SOCK_DGRAM) {
|
|
offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
|
|
if (unlikely(offset < 0))
|
|
goto out_free;
|
|
}
|
|
|
|
/* Returns -EFAULT on error */
|
|
err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len);
|
|
if (err)
|
|
goto out_free;
|
|
|
|
if (sock->type == SOCK_RAW &&
|
|
!dev_validate_header(dev, skb->data, len)) {
|
|
err = -EINVAL;
|
|
goto out_free;
|
|
}
|
|
|
|
sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
|
|
|
|
if (!vnet_hdr.gso_type && (len > dev->mtu + reserve + extra_len) &&
|
|
!packet_extra_vlan_len_allowed(dev, skb)) {
|
|
err = -EMSGSIZE;
|
|
goto out_free;
|
|
}
|
|
|
|
skb->protocol = proto;
|
|
skb->dev = dev;
|
|
skb->priority = sk->sk_priority;
|
|
skb->mark = sockc.mark;
|
|
|
|
packet_pick_tx_queue(dev, skb);
|
|
|
|
if (po->has_vnet_hdr) {
|
|
err = packet_snd_vnet_gso(skb, &vnet_hdr);
|
|
if (err)
|
|
goto out_free;
|
|
len += sizeof(vnet_hdr);
|
|
}
|
|
|
|
skb_probe_transport_header(skb, reserve);
|
|
|
|
if (unlikely(extra_len == 4))
|
|
skb->no_fcs = 1;
|
|
|
|
err = po->xmit(skb);
|
|
if (err > 0 && (err = net_xmit_errno(err)) != 0)
|
|
goto out_unlock;
|
|
|
|
dev_put(dev);
|
|
|
|
return len;
|
|
|
|
out_free:
|
|
kfree_skb(skb);
|
|
out_unlock:
|
|
if (dev)
|
|
dev_put(dev);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct packet_sock *po = pkt_sk(sk);
|
|
|
|
if (po->tx_ring.pg_vec)
|
|
return tpacket_snd(po, msg);
|
|
else
|
|
return packet_snd(sock, msg, len);
|
|
}
|
|
|
|
/*
|
|
* Close a PACKET socket. This is fairly simple. We immediately go
|
|
* to 'closed' state and remove our protocol entry in the device list.
|
|
*/
|
|
|
|
static int packet_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct packet_sock *po;
|
|
struct net *net;
|
|
union tpacket_req_u req_u;
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
net = sock_net(sk);
|
|
po = pkt_sk(sk);
|
|
|
|
mutex_lock(&net->packet.sklist_lock);
|
|
sk_del_node_init_rcu(sk);
|
|
mutex_unlock(&net->packet.sklist_lock);
|
|
|
|
preempt_disable();
|
|
sock_prot_inuse_add(net, sk->sk_prot, -1);
|
|
preempt_enable();
|
|
|
|
spin_lock(&po->bind_lock);
|
|
unregister_prot_hook(sk, false);
|
|
packet_cached_dev_reset(po);
|
|
|
|
if (po->prot_hook.dev) {
|
|
dev_put(po->prot_hook.dev);
|
|
po->prot_hook.dev = NULL;
|
|
}
|
|
spin_unlock(&po->bind_lock);
|
|
|
|
packet_flush_mclist(sk);
|
|
|
|
if (po->rx_ring.pg_vec) {
|
|
memset(&req_u, 0, sizeof(req_u));
|
|
packet_set_ring(sk, &req_u, 1, 0);
|
|
}
|
|
|
|
if (po->tx_ring.pg_vec) {
|
|
memset(&req_u, 0, sizeof(req_u));
|
|
packet_set_ring(sk, &req_u, 1, 1);
|
|
}
|
|
|
|
fanout_release(sk);
|
|
|
|
synchronize_net();
|
|
/*
|
|
* Now the socket is dead. No more input will appear.
|
|
*/
|
|
sock_orphan(sk);
|
|
sock->sk = NULL;
|
|
|
|
/* Purge queues */
|
|
|
|
skb_queue_purge(&sk->sk_receive_queue);
|
|
packet_free_pending(po);
|
|
sk_refcnt_debug_release(sk);
|
|
|
|
sock_put(sk);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Attach a packet hook.
|
|
*/
|
|
|
|
static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
|
|
__be16 proto)
|
|
{
|
|
struct packet_sock *po = pkt_sk(sk);
|
|
struct net_device *dev_curr;
|
|
__be16 proto_curr;
|
|
bool need_rehook;
|
|
struct net_device *dev = NULL;
|
|
int ret = 0;
|
|
bool unlisted = false;
|
|
|
|
if (po->fanout)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
spin_lock(&po->bind_lock);
|
|
rcu_read_lock();
|
|
|
|
if (name) {
|
|
dev = dev_get_by_name_rcu(sock_net(sk), name);
|
|
if (!dev) {
|
|
ret = -ENODEV;
|
|
goto out_unlock;
|
|
}
|
|
} else if (ifindex) {
|
|
dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
|
|
if (!dev) {
|
|
ret = -ENODEV;
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
if (dev)
|
|
dev_hold(dev);
|
|
|
|
proto_curr = po->prot_hook.type;
|
|
dev_curr = po->prot_hook.dev;
|
|
|
|
need_rehook = proto_curr != proto || dev_curr != dev;
|
|
|
|
if (need_rehook) {
|
|
if (po->running) {
|
|
rcu_read_unlock();
|
|
__unregister_prot_hook(sk, true);
|
|
rcu_read_lock();
|
|
dev_curr = po->prot_hook.dev;
|
|
if (dev)
|
|
unlisted = !dev_get_by_index_rcu(sock_net(sk),
|
|
dev->ifindex);
|
|
}
|
|
|
|
po->num = proto;
|
|
po->prot_hook.type = proto;
|
|
|
|
if (unlikely(unlisted)) {
|
|
dev_put(dev);
|
|
po->prot_hook.dev = NULL;
|
|
po->ifindex = -1;
|
|
packet_cached_dev_reset(po);
|
|
} else {
|
|
po->prot_hook.dev = dev;
|
|
po->ifindex = dev ? dev->ifindex : 0;
|
|
packet_cached_dev_assign(po, dev);
|
|
}
|
|
}
|
|
if (dev_curr)
|
|
dev_put(dev_curr);
|
|
|
|
if (proto == 0 || !need_rehook)
|
|
goto out_unlock;
|
|
|
|
if (!unlisted && (!dev || (dev->flags & IFF_UP))) {
|
|
register_prot_hook(sk);
|
|
} else {
|
|
sk->sk_err = ENETDOWN;
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk->sk_error_report(sk);
|
|
}
|
|
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
spin_unlock(&po->bind_lock);
|
|
release_sock(sk);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Bind a packet socket to a device
|
|
*/
|
|
|
|
static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
|
|
int addr_len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
char name[15];
|
|
|
|
/*
|
|
* Check legality
|
|
*/
|
|
|
|
if (addr_len != sizeof(struct sockaddr))
|
|
return -EINVAL;
|
|
strlcpy(name, uaddr->sa_data, sizeof(name));
|
|
|
|
return packet_do_bind(sk, name, 0, pkt_sk(sk)->num);
|
|
}
|
|
|
|
static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
|
|
{
|
|
struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
|
|
struct sock *sk = sock->sk;
|
|
|
|
/*
|
|
* Check legality
|
|
*/
|
|
|
|
if (addr_len < sizeof(struct sockaddr_ll))
|
|
return -EINVAL;
|
|
if (sll->sll_family != AF_PACKET)
|
|
return -EINVAL;
|
|
|
|
return packet_do_bind(sk, NULL, sll->sll_ifindex,
|
|
sll->sll_protocol ? : pkt_sk(sk)->num);
|
|
}
|
|
|
|
static struct proto packet_proto = {
|
|
.name = "PACKET",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct packet_sock),
|
|
};
|
|
|
|
/*
|
|
* Create a packet of type SOCK_PACKET.
|
|
*/
|
|
|
|
static int packet_create(struct net *net, struct socket *sock, int protocol,
|
|
int kern)
|
|
{
|
|
struct sock *sk;
|
|
struct packet_sock *po;
|
|
__be16 proto = (__force __be16)protocol; /* weird, but documented */
|
|
int err;
|
|
|
|
if (!ns_capable(net->user_ns, CAP_NET_RAW))
|
|
return -EPERM;
|
|
if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
|
|
sock->type != SOCK_PACKET)
|
|
return -ESOCKTNOSUPPORT;
|
|
|
|
sock->state = SS_UNCONNECTED;
|
|
|
|
err = -ENOBUFS;
|
|
sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern);
|
|
if (sk == NULL)
|
|
goto out;
|
|
|
|
sock->ops = &packet_ops;
|
|
if (sock->type == SOCK_PACKET)
|
|
sock->ops = &packet_ops_spkt;
|
|
|
|
sock_init_data(sock, sk);
|
|
|
|
po = pkt_sk(sk);
|
|
sk->sk_family = PF_PACKET;
|
|
po->num = proto;
|
|
po->xmit = dev_queue_xmit;
|
|
|
|
err = packet_alloc_pending(po);
|
|
if (err)
|
|
goto out2;
|
|
|
|
packet_cached_dev_reset(po);
|
|
|
|
sk->sk_destruct = packet_sock_destruct;
|
|
sk_refcnt_debug_inc(sk);
|
|
|
|
/*
|
|
* Attach a protocol block
|
|
*/
|
|
|
|
spin_lock_init(&po->bind_lock);
|
|
mutex_init(&po->pg_vec_lock);
|
|
po->rollover = NULL;
|
|
po->prot_hook.func = packet_rcv;
|
|
|
|
if (sock->type == SOCK_PACKET)
|
|
po->prot_hook.func = packet_rcv_spkt;
|
|
|
|
po->prot_hook.af_packet_priv = sk;
|
|
|
|
if (proto) {
|
|
po->prot_hook.type = proto;
|
|
register_prot_hook(sk);
|
|
}
|
|
|
|
mutex_lock(&net->packet.sklist_lock);
|
|
sk_add_node_rcu(sk, &net->packet.sklist);
|
|
mutex_unlock(&net->packet.sklist_lock);
|
|
|
|
preempt_disable();
|
|
sock_prot_inuse_add(net, &packet_proto, 1);
|
|
preempt_enable();
|
|
|
|
return 0;
|
|
out2:
|
|
sk_free(sk);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Pull a packet from our receive queue and hand it to the user.
|
|
* If necessary we block.
|
|
*/
|
|
|
|
static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
|
|
int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct sk_buff *skb;
|
|
int copied, err;
|
|
int vnet_hdr_len = 0;
|
|
unsigned int origlen = 0;
|
|
|
|
err = -EINVAL;
|
|
if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
|
|
goto out;
|
|
|
|
#if 0
|
|
/* What error should we return now? EUNATTACH? */
|
|
if (pkt_sk(sk)->ifindex < 0)
|
|
return -ENODEV;
|
|
#endif
|
|
|
|
if (flags & MSG_ERRQUEUE) {
|
|
err = sock_recv_errqueue(sk, msg, len,
|
|
SOL_PACKET, PACKET_TX_TIMESTAMP);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Call the generic datagram receiver. This handles all sorts
|
|
* of horrible races and re-entrancy so we can forget about it
|
|
* in the protocol layers.
|
|
*
|
|
* Now it will return ENETDOWN, if device have just gone down,
|
|
* but then it will block.
|
|
*/
|
|
|
|
skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
|
|
|
|
/*
|
|
* An error occurred so return it. Because skb_recv_datagram()
|
|
* handles the blocking we don't see and worry about blocking
|
|
* retries.
|
|
*/
|
|
|
|
if (skb == NULL)
|
|
goto out;
|
|
|
|
if (pkt_sk(sk)->pressure)
|
|
packet_rcv_has_room(pkt_sk(sk), NULL);
|
|
|
|
if (pkt_sk(sk)->has_vnet_hdr) {
|
|
err = packet_rcv_vnet(msg, skb, &len);
|
|
if (err)
|
|
goto out_free;
|
|
vnet_hdr_len = sizeof(struct virtio_net_hdr);
|
|
}
|
|
|
|
/* You lose any data beyond the buffer you gave. If it worries
|
|
* a user program they can ask the device for its MTU
|
|
* anyway.
|
|
*/
|
|
copied = skb->len;
|
|
if (copied > len) {
|
|
copied = len;
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
}
|
|
|
|
err = skb_copy_datagram_msg(skb, 0, msg, copied);
|
|
if (err)
|
|
goto out_free;
|
|
|
|
if (sock->type != SOCK_PACKET) {
|
|
struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
|
|
|
|
/* Original length was stored in sockaddr_ll fields */
|
|
origlen = PACKET_SKB_CB(skb)->sa.origlen;
|
|
sll->sll_family = AF_PACKET;
|
|
sll->sll_protocol = skb->protocol;
|
|
}
|
|
|
|
sock_recv_ts_and_drops(msg, sk, skb);
|
|
|
|
if (msg->msg_name) {
|
|
/* If the address length field is there to be filled
|
|
* in, we fill it in now.
|
|
*/
|
|
if (sock->type == SOCK_PACKET) {
|
|
__sockaddr_check_size(sizeof(struct sockaddr_pkt));
|
|
msg->msg_namelen = sizeof(struct sockaddr_pkt);
|
|
} else {
|
|
struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
|
|
|
|
msg->msg_namelen = sll->sll_halen +
|
|
offsetof(struct sockaddr_ll, sll_addr);
|
|
}
|
|
memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
|
|
msg->msg_namelen);
|
|
}
|
|
|
|
if (pkt_sk(sk)->auxdata) {
|
|
struct tpacket_auxdata aux;
|
|
|
|
aux.tp_status = TP_STATUS_USER;
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL)
|
|
aux.tp_status |= TP_STATUS_CSUMNOTREADY;
|
|
else if (skb->pkt_type != PACKET_OUTGOING &&
|
|
(skb->ip_summed == CHECKSUM_COMPLETE ||
|
|
skb_csum_unnecessary(skb)))
|
|
aux.tp_status |= TP_STATUS_CSUM_VALID;
|
|
|
|
aux.tp_len = origlen;
|
|
aux.tp_snaplen = skb->len;
|
|
aux.tp_mac = 0;
|
|
aux.tp_net = skb_network_offset(skb);
|
|
if (skb_vlan_tag_present(skb)) {
|
|
aux.tp_vlan_tci = skb_vlan_tag_get(skb);
|
|
aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
|
|
aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
|
|
} else {
|
|
aux.tp_vlan_tci = 0;
|
|
aux.tp_vlan_tpid = 0;
|
|
}
|
|
put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
|
|
}
|
|
|
|
/*
|
|
* Free or return the buffer as appropriate. Again this
|
|
* hides all the races and re-entrancy issues from us.
|
|
*/
|
|
err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
|
|
|
|
out_free:
|
|
skb_free_datagram(sk, skb);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
|
|
int *uaddr_len, int peer)
|
|
{
|
|
struct net_device *dev;
|
|
struct sock *sk = sock->sk;
|
|
|
|
if (peer)
|
|
return -EOPNOTSUPP;
|
|
|
|
uaddr->sa_family = AF_PACKET;
|
|
memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
|
|
rcu_read_lock();
|
|
dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
|
|
if (dev)
|
|
strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
|
|
rcu_read_unlock();
|
|
*uaddr_len = sizeof(*uaddr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
|
|
int *uaddr_len, int peer)
|
|
{
|
|
struct net_device *dev;
|
|
struct sock *sk = sock->sk;
|
|
struct packet_sock *po = pkt_sk(sk);
|
|
DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
|
|
|
|
if (peer)
|
|
return -EOPNOTSUPP;
|
|
|
|
sll->sll_family = AF_PACKET;
|
|
sll->sll_ifindex = po->ifindex;
|
|
sll->sll_protocol = po->num;
|
|
sll->sll_pkttype = 0;
|
|
rcu_read_lock();
|
|
dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
|
|
if (dev) {
|
|
sll->sll_hatype = dev->type;
|
|
sll->sll_halen = dev->addr_len;
|
|
memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
|
|
} else {
|
|
sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
|
|
sll->sll_halen = 0;
|
|
}
|
|
rcu_read_unlock();
|
|
*uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
|
|
int what)
|
|
{
|
|
switch (i->type) {
|
|
case PACKET_MR_MULTICAST:
|
|
if (i->alen != dev->addr_len)
|
|
return -EINVAL;
|
|
if (what > 0)
|
|
return dev_mc_add(dev, i->addr);
|
|
else
|
|
return dev_mc_del(dev, i->addr);
|
|
break;
|
|
case PACKET_MR_PROMISC:
|
|
return dev_set_promiscuity(dev, what);
|
|
case PACKET_MR_ALLMULTI:
|
|
return dev_set_allmulti(dev, what);
|
|
case PACKET_MR_UNICAST:
|
|
if (i->alen != dev->addr_len)
|
|
return -EINVAL;
|
|
if (what > 0)
|
|
return dev_uc_add(dev, i->addr);
|
|
else
|
|
return dev_uc_del(dev, i->addr);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void packet_dev_mclist_delete(struct net_device *dev,
|
|
struct packet_mclist **mlp)
|
|
{
|
|
struct packet_mclist *ml;
|
|
|
|
while ((ml = *mlp) != NULL) {
|
|
if (ml->ifindex == dev->ifindex) {
|
|
packet_dev_mc(dev, ml, -1);
|
|
*mlp = ml->next;
|
|
kfree(ml);
|
|
} else
|
|
mlp = &ml->next;
|
|
}
|
|
}
|
|
|
|
static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
|
|
{
|
|
struct packet_sock *po = pkt_sk(sk);
|
|
struct packet_mclist *ml, *i;
|
|
struct net_device *dev;
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
|
|
err = -ENODEV;
|
|
dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
|
|
if (!dev)
|
|
goto done;
|
|
|
|
err = -EINVAL;
|
|
if (mreq->mr_alen > dev->addr_len)
|
|
goto done;
|
|
|
|
err = -ENOBUFS;
|
|
i = kmalloc(sizeof(*i), GFP_KERNEL);
|
|
if (i == NULL)
|
|
goto done;
|
|
|
|
err = 0;
|
|
for (ml = po->mclist; ml; ml = ml->next) {
|
|
if (ml->ifindex == mreq->mr_ifindex &&
|
|
ml->type == mreq->mr_type &&
|
|
ml->alen == mreq->mr_alen &&
|
|
memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
|
|
ml->count++;
|
|
/* Free the new element ... */
|
|
kfree(i);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
i->type = mreq->mr_type;
|
|
i->ifindex = mreq->mr_ifindex;
|
|
i->alen = mreq->mr_alen;
|
|
memcpy(i->addr, mreq->mr_address, i->alen);
|
|
memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen);
|
|
i->count = 1;
|
|
i->next = po->mclist;
|
|
po->mclist = i;
|
|
err = packet_dev_mc(dev, i, 1);
|
|
if (err) {
|
|
po->mclist = i->next;
|
|
kfree(i);
|
|
}
|
|
|
|
done:
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
|
|
static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
|
|
{
|
|
struct packet_mclist *ml, **mlp;
|
|
|
|
rtnl_lock();
|
|
|
|
for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
|
|
if (ml->ifindex == mreq->mr_ifindex &&
|
|
ml->type == mreq->mr_type &&
|
|
ml->alen == mreq->mr_alen &&
|
|
memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
|
|
if (--ml->count == 0) {
|
|
struct net_device *dev;
|
|
*mlp = ml->next;
|
|
dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
|
|
if (dev)
|
|
packet_dev_mc(dev, ml, -1);
|
|
kfree(ml);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
rtnl_unlock();
|
|
return 0;
|
|
}
|
|
|
|
static void packet_flush_mclist(struct sock *sk)
|
|
{
|
|
struct packet_sock *po = pkt_sk(sk);
|
|
struct packet_mclist *ml;
|
|
|
|
if (!po->mclist)
|
|
return;
|
|
|
|
rtnl_lock();
|
|
while ((ml = po->mclist) != NULL) {
|
|
struct net_device *dev;
|
|
|
|
po->mclist = ml->next;
|
|
dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
|
|
if (dev != NULL)
|
|
packet_dev_mc(dev, ml, -1);
|
|
kfree(ml);
|
|
}
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static int
|
|
packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct packet_sock *po = pkt_sk(sk);
|
|
int ret;
|
|
|
|
if (level != SOL_PACKET)
|
|
return -ENOPROTOOPT;
|
|
|
|
switch (optname) {
|
|
case PACKET_ADD_MEMBERSHIP:
|
|
case PACKET_DROP_MEMBERSHIP:
|
|
{
|
|
struct packet_mreq_max mreq;
|
|
int len = optlen;
|
|
memset(&mreq, 0, sizeof(mreq));
|
|
if (len < sizeof(struct packet_mreq))
|
|
return -EINVAL;
|
|
if (len > sizeof(mreq))
|
|
len = sizeof(mreq);
|
|
if (copy_from_user(&mreq, optval, len))
|
|
return -EFAULT;
|
|
if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
|
|
return -EINVAL;
|
|
if (optname == PACKET_ADD_MEMBERSHIP)
|
|
ret = packet_mc_add(sk, &mreq);
|
|
else
|
|
ret = packet_mc_drop(sk, &mreq);
|
|
return ret;
|
|
}
|
|
|
|
case PACKET_RX_RING:
|
|
case PACKET_TX_RING:
|
|
{
|
|
union tpacket_req_u req_u;
|
|
int len;
|
|
|
|
switch (po->tp_version) {
|
|
case TPACKET_V1:
|
|
case TPACKET_V2:
|
|
len = sizeof(req_u.req);
|
|
break;
|
|
case TPACKET_V3:
|
|
default:
|
|
len = sizeof(req_u.req3);
|
|
break;
|
|
}
|
|
if (optlen < len)
|
|
return -EINVAL;
|
|
if (copy_from_user(&req_u.req, optval, len))
|
|
return -EFAULT;
|
|
return packet_set_ring(sk, &req_u, 0,
|
|
optname == PACKET_TX_RING);
|
|
}
|
|
case PACKET_COPY_THRESH:
|
|
{
|
|
int val;
|
|
|
|
if (optlen != sizeof(val))
|
|
return -EINVAL;
|
|
if (copy_from_user(&val, optval, sizeof(val)))
|
|
return -EFAULT;
|
|
|
|
pkt_sk(sk)->copy_thresh = val;
|
|
return 0;
|
|
}
|
|
case PACKET_VERSION:
|
|
{
|
|
int val;
|
|
|
|
if (optlen != sizeof(val))
|
|
return -EINVAL;
|
|
if (copy_from_user(&val, optval, sizeof(val)))
|
|
return -EFAULT;
|
|
switch (val) {
|
|
case TPACKET_V1:
|
|
case TPACKET_V2:
|
|
case TPACKET_V3:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
lock_sock(sk);
|
|
if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
|
|
ret = -EBUSY;
|
|
} else {
|
|
po->tp_version = val;
|
|
ret = 0;
|
|
}
|
|
release_sock(sk);
|
|
return ret;
|
|
}
|
|
case PACKET_RESERVE:
|
|
{
|
|
unsigned int val;
|
|
|
|
if (optlen != sizeof(val))
|
|
return -EINVAL;
|
|
if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
|
|
return -EBUSY;
|
|
if (copy_from_user(&val, optval, sizeof(val)))
|
|
return -EFAULT;
|
|
po->tp_reserve = val;
|
|
return 0;
|
|
}
|
|
case PACKET_LOSS:
|
|
{
|
|
unsigned int val;
|
|
|
|
if (optlen != sizeof(val))
|
|
return -EINVAL;
|
|
if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
|
|
return -EBUSY;
|
|
if (copy_from_user(&val, optval, sizeof(val)))
|
|
return -EFAULT;
|
|
po->tp_loss = !!val;
|
|
return 0;
|
|
}
|
|
case PACKET_AUXDATA:
|
|
{
|
|
int val;
|
|
|
|
if (optlen < sizeof(val))
|
|
return -EINVAL;
|
|
if (copy_from_user(&val, optval, sizeof(val)))
|
|
return -EFAULT;
|
|
|
|
po->auxdata = !!val;
|
|
return 0;
|
|
}
|
|
case PACKET_ORIGDEV:
|
|
{
|
|
int val;
|
|
|
|
if (optlen < sizeof(val))
|
|
return -EINVAL;
|
|
if (copy_from_user(&val, optval, sizeof(val)))
|
|
return -EFAULT;
|
|
|
|
po->origdev = !!val;
|
|
return 0;
|
|
}
|
|
case PACKET_VNET_HDR:
|
|
{
|
|
int val;
|
|
|
|
if (sock->type != SOCK_RAW)
|
|
return -EINVAL;
|
|
if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
|
|
return -EBUSY;
|
|
if (optlen < sizeof(val))
|
|
return -EINVAL;
|
|
if (copy_from_user(&val, optval, sizeof(val)))
|
|
return -EFAULT;
|
|
|
|
po->has_vnet_hdr = !!val;
|
|
return 0;
|
|
}
|
|
case PACKET_TIMESTAMP:
|
|
{
|
|
int val;
|
|
|
|
if (optlen != sizeof(val))
|
|
return -EINVAL;
|
|
if (copy_from_user(&val, optval, sizeof(val)))
|
|
return -EFAULT;
|
|
|
|
po->tp_tstamp = val;
|
|
return 0;
|
|
}
|
|
case PACKET_FANOUT:
|
|
{
|
|
int val;
|
|
|
|
if (optlen != sizeof(val))
|
|
return -EINVAL;
|
|
if (copy_from_user(&val, optval, sizeof(val)))
|
|
return -EFAULT;
|
|
|
|
return fanout_add(sk, val & 0xffff, val >> 16);
|
|
}
|
|
case PACKET_FANOUT_DATA:
|
|
{
|
|
if (!po->fanout)
|
|
return -EINVAL;
|
|
|
|
return fanout_set_data(po, optval, optlen);
|
|
}
|
|
case PACKET_TX_HAS_OFF:
|
|
{
|
|
unsigned int val;
|
|
|
|
if (optlen != sizeof(val))
|
|
return -EINVAL;
|
|
if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
|
|
return -EBUSY;
|
|
if (copy_from_user(&val, optval, sizeof(val)))
|
|
return -EFAULT;
|
|
po->tp_tx_has_off = !!val;
|
|
return 0;
|
|
}
|
|
case PACKET_QDISC_BYPASS:
|
|
{
|
|
int val;
|
|
|
|
if (optlen != sizeof(val))
|
|
return -EINVAL;
|
|
if (copy_from_user(&val, optval, sizeof(val)))
|
|
return -EFAULT;
|
|
|
|
po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
|
|
return 0;
|
|
}
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
}
|
|
|
|
static int packet_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
int len;
|
|
int val, lv = sizeof(val);
|
|
struct sock *sk = sock->sk;
|
|
struct packet_sock *po = pkt_sk(sk);
|
|
void *data = &val;
|
|
union tpacket_stats_u st;
|
|
struct tpacket_rollover_stats rstats;
|
|
|
|
if (level != SOL_PACKET)
|
|
return -ENOPROTOOPT;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
if (len < 0)
|
|
return -EINVAL;
|
|
|
|
switch (optname) {
|
|
case PACKET_STATISTICS:
|
|
spin_lock_bh(&sk->sk_receive_queue.lock);
|
|
memcpy(&st, &po->stats, sizeof(st));
|
|
memset(&po->stats, 0, sizeof(po->stats));
|
|
spin_unlock_bh(&sk->sk_receive_queue.lock);
|
|
|
|
if (po->tp_version == TPACKET_V3) {
|
|
lv = sizeof(struct tpacket_stats_v3);
|
|
st.stats3.tp_packets += st.stats3.tp_drops;
|
|
data = &st.stats3;
|
|
} else {
|
|
lv = sizeof(struct tpacket_stats);
|
|
st.stats1.tp_packets += st.stats1.tp_drops;
|
|
data = &st.stats1;
|
|
}
|
|
|
|
break;
|
|
case PACKET_AUXDATA:
|
|
val = po->auxdata;
|
|
break;
|
|
case PACKET_ORIGDEV:
|
|
val = po->origdev;
|
|
break;
|
|
case PACKET_VNET_HDR:
|
|
val = po->has_vnet_hdr;
|
|
break;
|
|
case PACKET_VERSION:
|
|
val = po->tp_version;
|
|
break;
|
|
case PACKET_HDRLEN:
|
|
if (len > sizeof(int))
|
|
len = sizeof(int);
|
|
if (copy_from_user(&val, optval, len))
|
|
return -EFAULT;
|
|
switch (val) {
|
|
case TPACKET_V1:
|
|
val = sizeof(struct tpacket_hdr);
|
|
break;
|
|
case TPACKET_V2:
|
|
val = sizeof(struct tpacket2_hdr);
|
|
break;
|
|
case TPACKET_V3:
|
|
val = sizeof(struct tpacket3_hdr);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
case PACKET_RESERVE:
|
|
val = po->tp_reserve;
|
|
break;
|
|
case PACKET_LOSS:
|
|
val = po->tp_loss;
|
|
break;
|
|
case PACKET_TIMESTAMP:
|
|
val = po->tp_tstamp;
|
|
break;
|
|
case PACKET_FANOUT:
|
|
val = (po->fanout ?
|
|
((u32)po->fanout->id |
|
|
((u32)po->fanout->type << 16) |
|
|
((u32)po->fanout->flags << 24)) :
|
|
0);
|
|
break;
|
|
case PACKET_ROLLOVER_STATS:
|
|
if (!po->rollover)
|
|
return -EINVAL;
|
|
rstats.tp_all = atomic_long_read(&po->rollover->num);
|
|
rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
|
|
rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
|
|
data = &rstats;
|
|
lv = sizeof(rstats);
|
|
break;
|
|
case PACKET_TX_HAS_OFF:
|
|
val = po->tp_tx_has_off;
|
|
break;
|
|
case PACKET_QDISC_BYPASS:
|
|
val = packet_use_direct_xmit(po);
|
|
break;
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
if (len > lv)
|
|
len = lv;
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, data, len))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int compat_packet_setsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
struct packet_sock *po = pkt_sk(sock->sk);
|
|
|
|
if (level != SOL_PACKET)
|
|
return -ENOPROTOOPT;
|
|
|
|
if (optname == PACKET_FANOUT_DATA &&
|
|
po->fanout && po->fanout->type == PACKET_FANOUT_CBPF) {
|
|
optval = (char __user *)get_compat_bpf_fprog(optval);
|
|
if (!optval)
|
|
return -EFAULT;
|
|
optlen = sizeof(struct sock_fprog);
|
|
}
|
|
|
|
return packet_setsockopt(sock, level, optname, optval, optlen);
|
|
}
|
|
#endif
|
|
|
|
static int packet_notifier(struct notifier_block *this,
|
|
unsigned long msg, void *ptr)
|
|
{
|
|
struct sock *sk;
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
struct net *net = dev_net(dev);
|
|
|
|
rcu_read_lock();
|
|
sk_for_each_rcu(sk, &net->packet.sklist) {
|
|
struct packet_sock *po = pkt_sk(sk);
|
|
|
|
switch (msg) {
|
|
case NETDEV_UNREGISTER:
|
|
if (po->mclist)
|
|
packet_dev_mclist_delete(dev, &po->mclist);
|
|
/* fallthrough */
|
|
|
|
case NETDEV_DOWN:
|
|
if (dev->ifindex == po->ifindex) {
|
|
spin_lock(&po->bind_lock);
|
|
if (po->running) {
|
|
__unregister_prot_hook(sk, false);
|
|
sk->sk_err = ENETDOWN;
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk->sk_error_report(sk);
|
|
}
|
|
if (msg == NETDEV_UNREGISTER) {
|
|
packet_cached_dev_reset(po);
|
|
fanout_release(sk);
|
|
po->ifindex = -1;
|
|
if (po->prot_hook.dev)
|
|
dev_put(po->prot_hook.dev);
|
|
po->prot_hook.dev = NULL;
|
|
}
|
|
spin_unlock(&po->bind_lock);
|
|
}
|
|
break;
|
|
case NETDEV_UP:
|
|
if (dev->ifindex == po->ifindex) {
|
|
spin_lock(&po->bind_lock);
|
|
if (po->num)
|
|
register_prot_hook(sk);
|
|
spin_unlock(&po->bind_lock);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
|
|
static int packet_ioctl(struct socket *sock, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
switch (cmd) {
|
|
case SIOCOUTQ:
|
|
{
|
|
int amount = sk_wmem_alloc_get(sk);
|
|
|
|
return put_user(amount, (int __user *)arg);
|
|
}
|
|
case SIOCINQ:
|
|
{
|
|
struct sk_buff *skb;
|
|
int amount = 0;
|
|
|
|
spin_lock_bh(&sk->sk_receive_queue.lock);
|
|
skb = skb_peek(&sk->sk_receive_queue);
|
|
if (skb)
|
|
amount = skb->len;
|
|
spin_unlock_bh(&sk->sk_receive_queue.lock);
|
|
return put_user(amount, (int __user *)arg);
|
|
}
|
|
case SIOCGSTAMP:
|
|
return sock_get_timestamp(sk, (struct timeval __user *)arg);
|
|
case SIOCGSTAMPNS:
|
|
return sock_get_timestampns(sk, (struct timespec __user *)arg);
|
|
|
|
#ifdef CONFIG_INET
|
|
case SIOCADDRT:
|
|
case SIOCDELRT:
|
|
case SIOCDARP:
|
|
case SIOCGARP:
|
|
case SIOCSARP:
|
|
case SIOCGIFADDR:
|
|
case SIOCSIFADDR:
|
|
case SIOCGIFBRDADDR:
|
|
case SIOCSIFBRDADDR:
|
|
case SIOCGIFNETMASK:
|
|
case SIOCSIFNETMASK:
|
|
case SIOCGIFDSTADDR:
|
|
case SIOCSIFDSTADDR:
|
|
case SIOCSIFFLAGS:
|
|
return inet_dgram_ops.ioctl(sock, cmd, arg);
|
|
#endif
|
|
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int packet_poll(struct file *file, struct socket *sock,
|
|
poll_table *wait)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct packet_sock *po = pkt_sk(sk);
|
|
unsigned int mask = datagram_poll(file, sock, wait);
|
|
|
|
spin_lock_bh(&sk->sk_receive_queue.lock);
|
|
if (po->rx_ring.pg_vec) {
|
|
if (!packet_previous_rx_frame(po, &po->rx_ring,
|
|
TP_STATUS_KERNEL))
|
|
mask |= POLLIN | POLLRDNORM;
|
|
}
|
|
if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL)
|
|
po->pressure = 0;
|
|
spin_unlock_bh(&sk->sk_receive_queue.lock);
|
|
spin_lock_bh(&sk->sk_write_queue.lock);
|
|
if (po->tx_ring.pg_vec) {
|
|
if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
|
|
mask |= POLLOUT | POLLWRNORM;
|
|
}
|
|
spin_unlock_bh(&sk->sk_write_queue.lock);
|
|
return mask;
|
|
}
|
|
|
|
|
|
/* Dirty? Well, I still did not learn better way to account
|
|
* for user mmaps.
|
|
*/
|
|
|
|
static void packet_mm_open(struct vm_area_struct *vma)
|
|
{
|
|
struct file *file = vma->vm_file;
|
|
struct socket *sock = file->private_data;
|
|
struct sock *sk = sock->sk;
|
|
|
|
if (sk)
|
|
atomic_inc(&pkt_sk(sk)->mapped);
|
|
}
|
|
|
|
static void packet_mm_close(struct vm_area_struct *vma)
|
|
{
|
|
struct file *file = vma->vm_file;
|
|
struct socket *sock = file->private_data;
|
|
struct sock *sk = sock->sk;
|
|
|
|
if (sk)
|
|
atomic_dec(&pkt_sk(sk)->mapped);
|
|
}
|
|
|
|
static const struct vm_operations_struct packet_mmap_ops = {
|
|
.open = packet_mm_open,
|
|
.close = packet_mm_close,
|
|
};
|
|
|
|
static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
|
|
unsigned int len)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
if (likely(pg_vec[i].buffer)) {
|
|
if (is_vmalloc_addr(pg_vec[i].buffer))
|
|
vfree(pg_vec[i].buffer);
|
|
else
|
|
free_pages((unsigned long)pg_vec[i].buffer,
|
|
order);
|
|
pg_vec[i].buffer = NULL;
|
|
}
|
|
}
|
|
kfree(pg_vec);
|
|
}
|
|
|
|
static char *alloc_one_pg_vec_page(unsigned long order)
|
|
{
|
|
char *buffer;
|
|
gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
|
|
__GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
|
|
|
|
buffer = (char *) __get_free_pages(gfp_flags, order);
|
|
if (buffer)
|
|
return buffer;
|
|
|
|
/* __get_free_pages failed, fall back to vmalloc */
|
|
buffer = vzalloc((1 << order) * PAGE_SIZE);
|
|
if (buffer)
|
|
return buffer;
|
|
|
|
/* vmalloc failed, lets dig into swap here */
|
|
gfp_flags &= ~__GFP_NORETRY;
|
|
buffer = (char *) __get_free_pages(gfp_flags, order);
|
|
if (buffer)
|
|
return buffer;
|
|
|
|
/* complete and utter failure */
|
|
return NULL;
|
|
}
|
|
|
|
static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
|
|
{
|
|
unsigned int block_nr = req->tp_block_nr;
|
|
struct pgv *pg_vec;
|
|
int i;
|
|
|
|
pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
|
|
if (unlikely(!pg_vec))
|
|
goto out;
|
|
|
|
for (i = 0; i < block_nr; i++) {
|
|
pg_vec[i].buffer = alloc_one_pg_vec_page(order);
|
|
if (unlikely(!pg_vec[i].buffer))
|
|
goto out_free_pgvec;
|
|
}
|
|
|
|
out:
|
|
return pg_vec;
|
|
|
|
out_free_pgvec:
|
|
free_pg_vec(pg_vec, order, block_nr);
|
|
pg_vec = NULL;
|
|
goto out;
|
|
}
|
|
|
|
static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
|
|
int closing, int tx_ring)
|
|
{
|
|
struct pgv *pg_vec = NULL;
|
|
struct packet_sock *po = pkt_sk(sk);
|
|
int was_running, order = 0;
|
|
struct packet_ring_buffer *rb;
|
|
struct sk_buff_head *rb_queue;
|
|
__be16 num;
|
|
int err = -EINVAL;
|
|
/* Added to avoid minimal code churn */
|
|
struct tpacket_req *req = &req_u->req;
|
|
|
|
lock_sock(sk);
|
|
/* Opening a Tx-ring is NOT supported in TPACKET_V3 */
|
|
if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
|
|
net_warn_ratelimited("Tx-ring is not supported.\n");
|
|
goto out;
|
|
}
|
|
|
|
rb = tx_ring ? &po->tx_ring : &po->rx_ring;
|
|
rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
|
|
|
|
err = -EBUSY;
|
|
if (!closing) {
|
|
if (atomic_read(&po->mapped))
|
|
goto out;
|
|
if (packet_read_pending(rb))
|
|
goto out;
|
|
}
|
|
|
|
if (req->tp_block_nr) {
|
|
/* Sanity tests and some calculations */
|
|
err = -EBUSY;
|
|
if (unlikely(rb->pg_vec))
|
|
goto out;
|
|
|
|
switch (po->tp_version) {
|
|
case TPACKET_V1:
|
|
po->tp_hdrlen = TPACKET_HDRLEN;
|
|
break;
|
|
case TPACKET_V2:
|
|
po->tp_hdrlen = TPACKET2_HDRLEN;
|
|
break;
|
|
case TPACKET_V3:
|
|
po->tp_hdrlen = TPACKET3_HDRLEN;
|
|
break;
|
|
}
|
|
|
|
err = -EINVAL;
|
|
if (unlikely((int)req->tp_block_size <= 0))
|
|
goto out;
|
|
if (unlikely(!PAGE_ALIGNED(req->tp_block_size)))
|
|
goto out;
|
|
if (po->tp_version >= TPACKET_V3 &&
|
|
(int)(req->tp_block_size -
|
|
BLK_PLUS_PRIV(req_u->req3.tp_sizeof_priv)) <= 0)
|
|
goto out;
|
|
if (unlikely(req->tp_frame_size < po->tp_hdrlen +
|
|
po->tp_reserve))
|
|
goto out;
|
|
if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
|
|
goto out;
|
|
|
|
rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
|
|
if (unlikely(rb->frames_per_block == 0))
|
|
goto out;
|
|
if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
|
|
req->tp_frame_nr))
|
|
goto out;
|
|
|
|
err = -ENOMEM;
|
|
order = get_order(req->tp_block_size);
|
|
pg_vec = alloc_pg_vec(req, order);
|
|
if (unlikely(!pg_vec))
|
|
goto out;
|
|
switch (po->tp_version) {
|
|
case TPACKET_V3:
|
|
/* Transmit path is not supported. We checked
|
|
* it above but just being paranoid
|
|
*/
|
|
if (!tx_ring)
|
|
init_prb_bdqc(po, rb, pg_vec, req_u);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
/* Done */
|
|
else {
|
|
err = -EINVAL;
|
|
if (unlikely(req->tp_frame_nr))
|
|
goto out;
|
|
}
|
|
|
|
|
|
/* Detach socket from network */
|
|
spin_lock(&po->bind_lock);
|
|
was_running = po->running;
|
|
num = po->num;
|
|
if (was_running) {
|
|
po->num = 0;
|
|
__unregister_prot_hook(sk, false);
|
|
}
|
|
spin_unlock(&po->bind_lock);
|
|
|
|
synchronize_net();
|
|
|
|
err = -EBUSY;
|
|
mutex_lock(&po->pg_vec_lock);
|
|
if (closing || atomic_read(&po->mapped) == 0) {
|
|
err = 0;
|
|
spin_lock_bh(&rb_queue->lock);
|
|
swap(rb->pg_vec, pg_vec);
|
|
rb->frame_max = (req->tp_frame_nr - 1);
|
|
rb->head = 0;
|
|
rb->frame_size = req->tp_frame_size;
|
|
spin_unlock_bh(&rb_queue->lock);
|
|
|
|
swap(rb->pg_vec_order, order);
|
|
swap(rb->pg_vec_len, req->tp_block_nr);
|
|
|
|
rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
|
|
po->prot_hook.func = (po->rx_ring.pg_vec) ?
|
|
tpacket_rcv : packet_rcv;
|
|
skb_queue_purge(rb_queue);
|
|
if (atomic_read(&po->mapped))
|
|
pr_err("packet_mmap: vma is busy: %d\n",
|
|
atomic_read(&po->mapped));
|
|
}
|
|
mutex_unlock(&po->pg_vec_lock);
|
|
|
|
spin_lock(&po->bind_lock);
|
|
if (was_running) {
|
|
po->num = num;
|
|
register_prot_hook(sk);
|
|
}
|
|
spin_unlock(&po->bind_lock);
|
|
if (closing && (po->tp_version > TPACKET_V2)) {
|
|
/* Because we don't support block-based V3 on tx-ring */
|
|
if (!tx_ring)
|
|
prb_shutdown_retire_blk_timer(po, rb_queue);
|
|
}
|
|
|
|
if (pg_vec)
|
|
free_pg_vec(pg_vec, order, req->tp_block_nr);
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int packet_mmap(struct file *file, struct socket *sock,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct packet_sock *po = pkt_sk(sk);
|
|
unsigned long size, expected_size;
|
|
struct packet_ring_buffer *rb;
|
|
unsigned long start;
|
|
int err = -EINVAL;
|
|
int i;
|
|
|
|
if (vma->vm_pgoff)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&po->pg_vec_lock);
|
|
|
|
expected_size = 0;
|
|
for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
|
|
if (rb->pg_vec) {
|
|
expected_size += rb->pg_vec_len
|
|
* rb->pg_vec_pages
|
|
* PAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
if (expected_size == 0)
|
|
goto out;
|
|
|
|
size = vma->vm_end - vma->vm_start;
|
|
if (size != expected_size)
|
|
goto out;
|
|
|
|
start = vma->vm_start;
|
|
for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
|
|
if (rb->pg_vec == NULL)
|
|
continue;
|
|
|
|
for (i = 0; i < rb->pg_vec_len; i++) {
|
|
struct page *page;
|
|
void *kaddr = rb->pg_vec[i].buffer;
|
|
int pg_num;
|
|
|
|
for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
|
|
page = pgv_to_page(kaddr);
|
|
err = vm_insert_page(vma, start, page);
|
|
if (unlikely(err))
|
|
goto out;
|
|
start += PAGE_SIZE;
|
|
kaddr += PAGE_SIZE;
|
|
}
|
|
}
|
|
}
|
|
|
|
atomic_inc(&po->mapped);
|
|
vma->vm_ops = &packet_mmap_ops;
|
|
err = 0;
|
|
|
|
out:
|
|
mutex_unlock(&po->pg_vec_lock);
|
|
return err;
|
|
}
|
|
|
|
static const struct proto_ops packet_ops_spkt = {
|
|
.family = PF_PACKET,
|
|
.owner = THIS_MODULE,
|
|
.release = packet_release,
|
|
.bind = packet_bind_spkt,
|
|
.connect = sock_no_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = packet_getname_spkt,
|
|
.poll = datagram_poll,
|
|
.ioctl = packet_ioctl,
|
|
.listen = sock_no_listen,
|
|
.shutdown = sock_no_shutdown,
|
|
.setsockopt = sock_no_setsockopt,
|
|
.getsockopt = sock_no_getsockopt,
|
|
.sendmsg = packet_sendmsg_spkt,
|
|
.recvmsg = packet_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
};
|
|
|
|
static const struct proto_ops packet_ops = {
|
|
.family = PF_PACKET,
|
|
.owner = THIS_MODULE,
|
|
.release = packet_release,
|
|
.bind = packet_bind,
|
|
.connect = sock_no_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = packet_getname,
|
|
.poll = packet_poll,
|
|
.ioctl = packet_ioctl,
|
|
.listen = sock_no_listen,
|
|
.shutdown = sock_no_shutdown,
|
|
.setsockopt = packet_setsockopt,
|
|
.getsockopt = packet_getsockopt,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_packet_setsockopt,
|
|
#endif
|
|
.sendmsg = packet_sendmsg,
|
|
.recvmsg = packet_recvmsg,
|
|
.mmap = packet_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
};
|
|
|
|
static const struct net_proto_family packet_family_ops = {
|
|
.family = PF_PACKET,
|
|
.create = packet_create,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static struct notifier_block packet_netdev_notifier = {
|
|
.notifier_call = packet_notifier,
|
|
};
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
|
|
__acquires(RCU)
|
|
{
|
|
struct net *net = seq_file_net(seq);
|
|
|
|
rcu_read_lock();
|
|
return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
|
|
}
|
|
|
|
static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct net *net = seq_file_net(seq);
|
|
return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
|
|
}
|
|
|
|
static void packet_seq_stop(struct seq_file *seq, void *v)
|
|
__releases(RCU)
|
|
{
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static int packet_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
|
|
else {
|
|
struct sock *s = sk_entry(v);
|
|
const struct packet_sock *po = pkt_sk(s);
|
|
|
|
seq_printf(seq,
|
|
"%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
|
|
s,
|
|
atomic_read(&s->sk_refcnt),
|
|
s->sk_type,
|
|
ntohs(po->num),
|
|
po->ifindex,
|
|
po->running,
|
|
atomic_read(&s->sk_rmem_alloc),
|
|
from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),
|
|
sock_i_ino(s));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations packet_seq_ops = {
|
|
.start = packet_seq_start,
|
|
.next = packet_seq_next,
|
|
.stop = packet_seq_stop,
|
|
.show = packet_seq_show,
|
|
};
|
|
|
|
static int packet_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open_net(inode, file, &packet_seq_ops,
|
|
sizeof(struct seq_net_private));
|
|
}
|
|
|
|
static const struct file_operations packet_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = packet_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net,
|
|
};
|
|
|
|
#endif
|
|
|
|
static int __net_init packet_net_init(struct net *net)
|
|
{
|
|
mutex_init(&net->packet.sklist_lock);
|
|
INIT_HLIST_HEAD(&net->packet.sklist);
|
|
|
|
if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit packet_net_exit(struct net *net)
|
|
{
|
|
remove_proc_entry("packet", net->proc_net);
|
|
}
|
|
|
|
static struct pernet_operations packet_net_ops = {
|
|
.init = packet_net_init,
|
|
.exit = packet_net_exit,
|
|
};
|
|
|
|
|
|
static void __exit packet_exit(void)
|
|
{
|
|
unregister_netdevice_notifier(&packet_netdev_notifier);
|
|
unregister_pernet_subsys(&packet_net_ops);
|
|
sock_unregister(PF_PACKET);
|
|
proto_unregister(&packet_proto);
|
|
}
|
|
|
|
static int __init packet_init(void)
|
|
{
|
|
int rc = proto_register(&packet_proto, 0);
|
|
|
|
if (rc != 0)
|
|
goto out;
|
|
|
|
sock_register(&packet_family_ops);
|
|
register_pernet_subsys(&packet_net_ops);
|
|
register_netdevice_notifier(&packet_netdev_notifier);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
module_init(packet_init);
|
|
module_exit(packet_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_NETPROTO(PF_PACKET);
|