mirror of https://gitee.com/openkylin/linux.git
1621 lines
37 KiB
C
1621 lines
37 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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* The IP to API glue.
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*
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* Authors: see ip.c
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*
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* Fixes:
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* Many : Split from ip.c , see ip.c for history.
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* Martin Mares : TOS setting fixed.
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* Alan Cox : Fixed a couple of oopses in Martin's
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* TOS tweaks.
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* Mike McLagan : Routing by source
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/icmp.h>
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#include <linux/inetdevice.h>
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#include <linux/netdevice.h>
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#include <linux/slab.h>
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#include <net/sock.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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#include <net/tcp_states.h>
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#include <linux/udp.h>
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#include <linux/igmp.h>
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#include <linux/netfilter.h>
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#include <linux/route.h>
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#include <linux/mroute.h>
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#include <net/inet_ecn.h>
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#include <net/route.h>
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#include <net/xfrm.h>
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#include <net/compat.h>
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#include <net/checksum.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/transp_v6.h>
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#endif
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#include <net/ip_fib.h>
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#include <linux/errqueue.h>
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#include <linux/uaccess.h>
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#include <linux/bpfilter.h>
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/*
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* SOL_IP control messages.
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*/
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static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
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{
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struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
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info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
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put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
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}
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static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
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{
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int ttl = ip_hdr(skb)->ttl;
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put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
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}
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static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
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{
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put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
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}
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static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
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{
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if (IPCB(skb)->opt.optlen == 0)
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return;
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put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
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ip_hdr(skb) + 1);
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}
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static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg,
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struct sk_buff *skb)
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{
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unsigned char optbuf[sizeof(struct ip_options) + 40];
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struct ip_options *opt = (struct ip_options *)optbuf;
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if (IPCB(skb)->opt.optlen == 0)
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return;
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if (ip_options_echo(net, opt, skb)) {
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msg->msg_flags |= MSG_CTRUNC;
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return;
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}
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ip_options_undo(opt);
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put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
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}
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static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb)
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{
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int val;
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if (IPCB(skb)->frag_max_size == 0)
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return;
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val = IPCB(skb)->frag_max_size;
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put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val);
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}
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static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
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int tlen, int offset)
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{
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__wsum csum = skb->csum;
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if (skb->ip_summed != CHECKSUM_COMPLETE)
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return;
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if (offset != 0) {
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int tend_off = skb_transport_offset(skb) + tlen;
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csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0));
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}
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put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
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}
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static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
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{
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char *secdata;
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u32 seclen, secid;
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int err;
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err = security_socket_getpeersec_dgram(NULL, skb, &secid);
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if (err)
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return;
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err = security_secid_to_secctx(secid, &secdata, &seclen);
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if (err)
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return;
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put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
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security_release_secctx(secdata, seclen);
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}
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static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
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{
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__be16 _ports[2], *ports;
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struct sockaddr_in sin;
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/* All current transport protocols have the port numbers in the
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* first four bytes of the transport header and this function is
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* written with this assumption in mind.
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*/
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ports = skb_header_pointer(skb, skb_transport_offset(skb),
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sizeof(_ports), &_ports);
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if (!ports)
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return;
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = ip_hdr(skb)->daddr;
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sin.sin_port = ports[1];
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memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
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put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
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}
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void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
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struct sk_buff *skb, int tlen, int offset)
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{
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struct inet_sock *inet = inet_sk(sk);
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unsigned int flags = inet->cmsg_flags;
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/* Ordered by supposed usage frequency */
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if (flags & IP_CMSG_PKTINFO) {
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ip_cmsg_recv_pktinfo(msg, skb);
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flags &= ~IP_CMSG_PKTINFO;
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if (!flags)
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return;
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}
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if (flags & IP_CMSG_TTL) {
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ip_cmsg_recv_ttl(msg, skb);
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flags &= ~IP_CMSG_TTL;
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if (!flags)
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return;
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}
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if (flags & IP_CMSG_TOS) {
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ip_cmsg_recv_tos(msg, skb);
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flags &= ~IP_CMSG_TOS;
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if (!flags)
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return;
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}
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if (flags & IP_CMSG_RECVOPTS) {
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ip_cmsg_recv_opts(msg, skb);
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flags &= ~IP_CMSG_RECVOPTS;
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if (!flags)
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return;
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}
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if (flags & IP_CMSG_RETOPTS) {
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ip_cmsg_recv_retopts(sock_net(sk), msg, skb);
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flags &= ~IP_CMSG_RETOPTS;
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if (!flags)
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return;
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}
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if (flags & IP_CMSG_PASSSEC) {
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ip_cmsg_recv_security(msg, skb);
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flags &= ~IP_CMSG_PASSSEC;
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if (!flags)
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return;
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}
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if (flags & IP_CMSG_ORIGDSTADDR) {
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ip_cmsg_recv_dstaddr(msg, skb);
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flags &= ~IP_CMSG_ORIGDSTADDR;
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if (!flags)
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return;
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}
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if (flags & IP_CMSG_CHECKSUM)
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ip_cmsg_recv_checksum(msg, skb, tlen, offset);
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if (flags & IP_CMSG_RECVFRAGSIZE)
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ip_cmsg_recv_fragsize(msg, skb);
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}
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EXPORT_SYMBOL(ip_cmsg_recv_offset);
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int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
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bool allow_ipv6)
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{
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int err, val;
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struct cmsghdr *cmsg;
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struct net *net = sock_net(sk);
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for_each_cmsghdr(cmsg, msg) {
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if (!CMSG_OK(msg, cmsg))
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return -EINVAL;
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#if IS_ENABLED(CONFIG_IPV6)
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if (allow_ipv6 &&
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cmsg->cmsg_level == SOL_IPV6 &&
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cmsg->cmsg_type == IPV6_PKTINFO) {
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struct in6_pktinfo *src_info;
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if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
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return -EINVAL;
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src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
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if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
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return -EINVAL;
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if (src_info->ipi6_ifindex)
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ipc->oif = src_info->ipi6_ifindex;
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ipc->addr = src_info->ipi6_addr.s6_addr32[3];
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continue;
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}
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#endif
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if (cmsg->cmsg_level == SOL_SOCKET) {
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err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc);
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if (err)
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return err;
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continue;
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}
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if (cmsg->cmsg_level != SOL_IP)
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continue;
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switch (cmsg->cmsg_type) {
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case IP_RETOPTS:
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err = cmsg->cmsg_len - sizeof(struct cmsghdr);
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/* Our caller is responsible for freeing ipc->opt */
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err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
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err < 40 ? err : 40);
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if (err)
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return err;
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break;
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case IP_PKTINFO:
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{
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struct in_pktinfo *info;
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if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
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return -EINVAL;
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info = (struct in_pktinfo *)CMSG_DATA(cmsg);
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if (info->ipi_ifindex)
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ipc->oif = info->ipi_ifindex;
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ipc->addr = info->ipi_spec_dst.s_addr;
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break;
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}
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case IP_TTL:
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if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
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return -EINVAL;
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val = *(int *)CMSG_DATA(cmsg);
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if (val < 1 || val > 255)
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return -EINVAL;
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ipc->ttl = val;
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break;
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case IP_TOS:
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if (cmsg->cmsg_len == CMSG_LEN(sizeof(int)))
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val = *(int *)CMSG_DATA(cmsg);
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else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8)))
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val = *(u8 *)CMSG_DATA(cmsg);
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else
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return -EINVAL;
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if (val < 0 || val > 255)
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return -EINVAL;
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ipc->tos = val;
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ipc->priority = rt_tos2priority(ipc->tos);
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break;
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default:
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return -EINVAL;
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}
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}
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return 0;
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}
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static void ip_ra_destroy_rcu(struct rcu_head *head)
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{
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struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
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sock_put(ra->saved_sk);
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kfree(ra);
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}
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int ip_ra_control(struct sock *sk, unsigned char on,
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void (*destructor)(struct sock *))
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{
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struct ip_ra_chain *ra, *new_ra;
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struct ip_ra_chain __rcu **rap;
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struct net *net = sock_net(sk);
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if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
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return -EINVAL;
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new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
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mutex_lock(&net->ipv4.ra_mutex);
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for (rap = &net->ipv4.ra_chain;
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(ra = rcu_dereference_protected(*rap,
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lockdep_is_held(&net->ipv4.ra_mutex))) != NULL;
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rap = &ra->next) {
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if (ra->sk == sk) {
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if (on) {
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mutex_unlock(&net->ipv4.ra_mutex);
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kfree(new_ra);
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return -EADDRINUSE;
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}
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/* dont let ip_call_ra_chain() use sk again */
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ra->sk = NULL;
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RCU_INIT_POINTER(*rap, ra->next);
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mutex_unlock(&net->ipv4.ra_mutex);
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if (ra->destructor)
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ra->destructor(sk);
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/*
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* Delay sock_put(sk) and kfree(ra) after one rcu grace
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* period. This guarantee ip_call_ra_chain() dont need
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* to mess with socket refcounts.
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*/
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ra->saved_sk = sk;
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call_rcu(&ra->rcu, ip_ra_destroy_rcu);
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return 0;
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}
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}
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if (!new_ra) {
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mutex_unlock(&net->ipv4.ra_mutex);
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return -ENOBUFS;
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}
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new_ra->sk = sk;
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new_ra->destructor = destructor;
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RCU_INIT_POINTER(new_ra->next, ra);
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rcu_assign_pointer(*rap, new_ra);
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sock_hold(sk);
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mutex_unlock(&net->ipv4.ra_mutex);
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return 0;
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}
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void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
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__be16 port, u32 info, u8 *payload)
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{
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struct sock_exterr_skb *serr;
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skb = skb_clone(skb, GFP_ATOMIC);
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if (!skb)
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return;
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serr = SKB_EXT_ERR(skb);
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serr->ee.ee_errno = err;
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serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
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serr->ee.ee_type = icmp_hdr(skb)->type;
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serr->ee.ee_code = icmp_hdr(skb)->code;
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serr->ee.ee_pad = 0;
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serr->ee.ee_info = info;
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serr->ee.ee_data = 0;
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serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
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skb_network_header(skb);
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serr->port = port;
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if (skb_pull(skb, payload - skb->data)) {
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skb_reset_transport_header(skb);
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if (sock_queue_err_skb(sk, skb) == 0)
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return;
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}
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kfree_skb(skb);
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}
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void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
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{
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struct inet_sock *inet = inet_sk(sk);
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struct sock_exterr_skb *serr;
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struct iphdr *iph;
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struct sk_buff *skb;
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if (!inet->recverr)
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return;
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skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
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if (!skb)
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return;
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skb_put(skb, sizeof(struct iphdr));
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skb_reset_network_header(skb);
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iph = ip_hdr(skb);
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iph->daddr = daddr;
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serr = SKB_EXT_ERR(skb);
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serr->ee.ee_errno = err;
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serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
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serr->ee.ee_type = 0;
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serr->ee.ee_code = 0;
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serr->ee.ee_pad = 0;
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serr->ee.ee_info = info;
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serr->ee.ee_data = 0;
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serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
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serr->port = port;
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__skb_pull(skb, skb_tail_pointer(skb) - skb->data);
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skb_reset_transport_header(skb);
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if (sock_queue_err_skb(sk, skb))
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kfree_skb(skb);
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}
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/* For some errors we have valid addr_offset even with zero payload and
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* zero port. Also, addr_offset should be supported if port is set.
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*/
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static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
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{
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return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
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serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
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}
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/* IPv4 supports cmsg on all imcp errors and some timestamps
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*
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* Timestamp code paths do not initialize the fields expected by cmsg:
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* the PKTINFO fields in skb->cb[]. Fill those in here.
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*/
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static bool ipv4_datagram_support_cmsg(const struct sock *sk,
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struct sk_buff *skb,
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int ee_origin)
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{
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struct in_pktinfo *info;
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if (ee_origin == SO_EE_ORIGIN_ICMP)
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return true;
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if (ee_origin == SO_EE_ORIGIN_LOCAL)
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return false;
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/* Support IP_PKTINFO on tstamp packets if requested, to correlate
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* timestamp with egress dev. Not possible for packets without iif
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* or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
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*/
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info = PKTINFO_SKB_CB(skb);
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if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) ||
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!info->ipi_ifindex)
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return false;
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info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
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return true;
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}
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/*
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* Handle MSG_ERRQUEUE
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*/
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int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
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{
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struct sock_exterr_skb *serr;
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struct sk_buff *skb;
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DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
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struct {
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struct sock_extended_err ee;
|
|
struct sockaddr_in offender;
|
|
} errhdr;
|
|
int err;
|
|
int copied;
|
|
|
|
err = -EAGAIN;
|
|
skb = sock_dequeue_err_skb(sk);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
copied = skb->len;
|
|
if (copied > len) {
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
copied = len;
|
|
}
|
|
err = skb_copy_datagram_msg(skb, 0, msg, copied);
|
|
if (unlikely(err)) {
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
sock_recv_timestamp(msg, sk, skb);
|
|
|
|
serr = SKB_EXT_ERR(skb);
|
|
|
|
if (sin && ipv4_datagram_support_addr(serr)) {
|
|
sin->sin_family = AF_INET;
|
|
sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
|
|
serr->addr_offset);
|
|
sin->sin_port = serr->port;
|
|
memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
|
|
*addr_len = sizeof(*sin);
|
|
}
|
|
|
|
memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
|
|
sin = &errhdr.offender;
|
|
memset(sin, 0, sizeof(*sin));
|
|
|
|
if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
|
|
sin->sin_family = AF_INET;
|
|
sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
|
|
if (inet_sk(sk)->cmsg_flags)
|
|
ip_cmsg_recv(msg, skb);
|
|
}
|
|
|
|
put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
|
|
|
|
/* Now we could try to dump offended packet options */
|
|
|
|
msg->msg_flags |= MSG_ERRQUEUE;
|
|
err = copied;
|
|
|
|
consume_skb(skb);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* Socket option code for IP. This is the end of the line after any
|
|
* TCP,UDP etc options on an IP socket.
|
|
*/
|
|
static bool setsockopt_needs_rtnl(int optname)
|
|
{
|
|
switch (optname) {
|
|
case IP_ADD_MEMBERSHIP:
|
|
case IP_ADD_SOURCE_MEMBERSHIP:
|
|
case IP_BLOCK_SOURCE:
|
|
case IP_DROP_MEMBERSHIP:
|
|
case IP_DROP_SOURCE_MEMBERSHIP:
|
|
case IP_MSFILTER:
|
|
case IP_UNBLOCK_SOURCE:
|
|
case MCAST_BLOCK_SOURCE:
|
|
case MCAST_MSFILTER:
|
|
case MCAST_JOIN_GROUP:
|
|
case MCAST_JOIN_SOURCE_GROUP:
|
|
case MCAST_LEAVE_GROUP:
|
|
case MCAST_LEAVE_SOURCE_GROUP:
|
|
case MCAST_UNBLOCK_SOURCE:
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static int do_ip_setsockopt(struct sock *sk, int level,
|
|
int optname, char __user *optval, unsigned int optlen)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct net *net = sock_net(sk);
|
|
int val = 0, err;
|
|
bool needs_rtnl = setsockopt_needs_rtnl(optname);
|
|
|
|
switch (optname) {
|
|
case IP_PKTINFO:
|
|
case IP_RECVTTL:
|
|
case IP_RECVOPTS:
|
|
case IP_RECVTOS:
|
|
case IP_RETOPTS:
|
|
case IP_TOS:
|
|
case IP_TTL:
|
|
case IP_HDRINCL:
|
|
case IP_MTU_DISCOVER:
|
|
case IP_RECVERR:
|
|
case IP_ROUTER_ALERT:
|
|
case IP_FREEBIND:
|
|
case IP_PASSSEC:
|
|
case IP_TRANSPARENT:
|
|
case IP_MINTTL:
|
|
case IP_NODEFRAG:
|
|
case IP_BIND_ADDRESS_NO_PORT:
|
|
case IP_UNICAST_IF:
|
|
case IP_MULTICAST_TTL:
|
|
case IP_MULTICAST_ALL:
|
|
case IP_MULTICAST_LOOP:
|
|
case IP_RECVORIGDSTADDR:
|
|
case IP_CHECKSUM:
|
|
case IP_RECVFRAGSIZE:
|
|
if (optlen >= sizeof(int)) {
|
|
if (get_user(val, (int __user *) optval))
|
|
return -EFAULT;
|
|
} else if (optlen >= sizeof(char)) {
|
|
unsigned char ucval;
|
|
|
|
if (get_user(ucval, (unsigned char __user *) optval))
|
|
return -EFAULT;
|
|
val = (int) ucval;
|
|
}
|
|
}
|
|
|
|
/* If optlen==0, it is equivalent to val == 0 */
|
|
|
|
if (optname == IP_ROUTER_ALERT)
|
|
return ip_ra_control(sk, val ? 1 : 0, NULL);
|
|
if (ip_mroute_opt(optname))
|
|
return ip_mroute_setsockopt(sk, optname, optval, optlen);
|
|
|
|
err = 0;
|
|
if (needs_rtnl)
|
|
rtnl_lock();
|
|
lock_sock(sk);
|
|
|
|
switch (optname) {
|
|
case IP_OPTIONS:
|
|
{
|
|
struct ip_options_rcu *old, *opt = NULL;
|
|
|
|
if (optlen > 40)
|
|
goto e_inval;
|
|
err = ip_options_get_from_user(sock_net(sk), &opt,
|
|
optval, optlen);
|
|
if (err)
|
|
break;
|
|
old = rcu_dereference_protected(inet->inet_opt,
|
|
lockdep_sock_is_held(sk));
|
|
if (inet->is_icsk) {
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
if (sk->sk_family == PF_INET ||
|
|
(!((1 << sk->sk_state) &
|
|
(TCPF_LISTEN | TCPF_CLOSE)) &&
|
|
inet->inet_daddr != LOOPBACK4_IPV6)) {
|
|
#endif
|
|
if (old)
|
|
icsk->icsk_ext_hdr_len -= old->opt.optlen;
|
|
if (opt)
|
|
icsk->icsk_ext_hdr_len += opt->opt.optlen;
|
|
icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
}
|
|
#endif
|
|
}
|
|
rcu_assign_pointer(inet->inet_opt, opt);
|
|
if (old)
|
|
kfree_rcu(old, rcu);
|
|
break;
|
|
}
|
|
case IP_PKTINFO:
|
|
if (val)
|
|
inet->cmsg_flags |= IP_CMSG_PKTINFO;
|
|
else
|
|
inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
|
|
break;
|
|
case IP_RECVTTL:
|
|
if (val)
|
|
inet->cmsg_flags |= IP_CMSG_TTL;
|
|
else
|
|
inet->cmsg_flags &= ~IP_CMSG_TTL;
|
|
break;
|
|
case IP_RECVTOS:
|
|
if (val)
|
|
inet->cmsg_flags |= IP_CMSG_TOS;
|
|
else
|
|
inet->cmsg_flags &= ~IP_CMSG_TOS;
|
|
break;
|
|
case IP_RECVOPTS:
|
|
if (val)
|
|
inet->cmsg_flags |= IP_CMSG_RECVOPTS;
|
|
else
|
|
inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
|
|
break;
|
|
case IP_RETOPTS:
|
|
if (val)
|
|
inet->cmsg_flags |= IP_CMSG_RETOPTS;
|
|
else
|
|
inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
|
|
break;
|
|
case IP_PASSSEC:
|
|
if (val)
|
|
inet->cmsg_flags |= IP_CMSG_PASSSEC;
|
|
else
|
|
inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
|
|
break;
|
|
case IP_RECVORIGDSTADDR:
|
|
if (val)
|
|
inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
|
|
else
|
|
inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
|
|
break;
|
|
case IP_CHECKSUM:
|
|
if (val) {
|
|
if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
|
|
inet_inc_convert_csum(sk);
|
|
inet->cmsg_flags |= IP_CMSG_CHECKSUM;
|
|
}
|
|
} else {
|
|
if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
|
|
inet_dec_convert_csum(sk);
|
|
inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
|
|
}
|
|
}
|
|
break;
|
|
case IP_RECVFRAGSIZE:
|
|
if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM)
|
|
goto e_inval;
|
|
if (val)
|
|
inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE;
|
|
else
|
|
inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE;
|
|
break;
|
|
case IP_TOS: /* This sets both TOS and Precedence */
|
|
if (sk->sk_type == SOCK_STREAM) {
|
|
val &= ~INET_ECN_MASK;
|
|
val |= inet->tos & INET_ECN_MASK;
|
|
}
|
|
if (inet->tos != val) {
|
|
inet->tos = val;
|
|
sk->sk_priority = rt_tos2priority(val);
|
|
sk_dst_reset(sk);
|
|
}
|
|
break;
|
|
case IP_TTL:
|
|
if (optlen < 1)
|
|
goto e_inval;
|
|
if (val != -1 && (val < 1 || val > 255))
|
|
goto e_inval;
|
|
inet->uc_ttl = val;
|
|
break;
|
|
case IP_HDRINCL:
|
|
if (sk->sk_type != SOCK_RAW) {
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
inet->hdrincl = val ? 1 : 0;
|
|
break;
|
|
case IP_NODEFRAG:
|
|
if (sk->sk_type != SOCK_RAW) {
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
inet->nodefrag = val ? 1 : 0;
|
|
break;
|
|
case IP_BIND_ADDRESS_NO_PORT:
|
|
inet->bind_address_no_port = val ? 1 : 0;
|
|
break;
|
|
case IP_MTU_DISCOVER:
|
|
if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
|
|
goto e_inval;
|
|
inet->pmtudisc = val;
|
|
break;
|
|
case IP_RECVERR:
|
|
inet->recverr = !!val;
|
|
if (!val)
|
|
skb_queue_purge(&sk->sk_error_queue);
|
|
break;
|
|
case IP_MULTICAST_TTL:
|
|
if (sk->sk_type == SOCK_STREAM)
|
|
goto e_inval;
|
|
if (optlen < 1)
|
|
goto e_inval;
|
|
if (val == -1)
|
|
val = 1;
|
|
if (val < 0 || val > 255)
|
|
goto e_inval;
|
|
inet->mc_ttl = val;
|
|
break;
|
|
case IP_MULTICAST_LOOP:
|
|
if (optlen < 1)
|
|
goto e_inval;
|
|
inet->mc_loop = !!val;
|
|
break;
|
|
case IP_UNICAST_IF:
|
|
{
|
|
struct net_device *dev = NULL;
|
|
int ifindex;
|
|
int midx;
|
|
|
|
if (optlen != sizeof(int))
|
|
goto e_inval;
|
|
|
|
ifindex = (__force int)ntohl((__force __be32)val);
|
|
if (ifindex == 0) {
|
|
inet->uc_index = 0;
|
|
err = 0;
|
|
break;
|
|
}
|
|
|
|
dev = dev_get_by_index(sock_net(sk), ifindex);
|
|
err = -EADDRNOTAVAIL;
|
|
if (!dev)
|
|
break;
|
|
|
|
midx = l3mdev_master_ifindex(dev);
|
|
dev_put(dev);
|
|
|
|
err = -EINVAL;
|
|
if (sk->sk_bound_dev_if &&
|
|
(!midx || midx != sk->sk_bound_dev_if))
|
|
break;
|
|
|
|
inet->uc_index = ifindex;
|
|
err = 0;
|
|
break;
|
|
}
|
|
case IP_MULTICAST_IF:
|
|
{
|
|
struct ip_mreqn mreq;
|
|
struct net_device *dev = NULL;
|
|
int midx;
|
|
|
|
if (sk->sk_type == SOCK_STREAM)
|
|
goto e_inval;
|
|
/*
|
|
* Check the arguments are allowable
|
|
*/
|
|
|
|
if (optlen < sizeof(struct in_addr))
|
|
goto e_inval;
|
|
|
|
err = -EFAULT;
|
|
if (optlen >= sizeof(struct ip_mreqn)) {
|
|
if (copy_from_user(&mreq, optval, sizeof(mreq)))
|
|
break;
|
|
} else {
|
|
memset(&mreq, 0, sizeof(mreq));
|
|
if (optlen >= sizeof(struct ip_mreq)) {
|
|
if (copy_from_user(&mreq, optval,
|
|
sizeof(struct ip_mreq)))
|
|
break;
|
|
} else if (optlen >= sizeof(struct in_addr)) {
|
|
if (copy_from_user(&mreq.imr_address, optval,
|
|
sizeof(struct in_addr)))
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!mreq.imr_ifindex) {
|
|
if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
|
|
inet->mc_index = 0;
|
|
inet->mc_addr = 0;
|
|
err = 0;
|
|
break;
|
|
}
|
|
dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
|
|
if (dev)
|
|
mreq.imr_ifindex = dev->ifindex;
|
|
} else
|
|
dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
|
|
|
|
|
|
err = -EADDRNOTAVAIL;
|
|
if (!dev)
|
|
break;
|
|
|
|
midx = l3mdev_master_ifindex(dev);
|
|
|
|
dev_put(dev);
|
|
|
|
err = -EINVAL;
|
|
if (sk->sk_bound_dev_if &&
|
|
mreq.imr_ifindex != sk->sk_bound_dev_if &&
|
|
(!midx || midx != sk->sk_bound_dev_if))
|
|
break;
|
|
|
|
inet->mc_index = mreq.imr_ifindex;
|
|
inet->mc_addr = mreq.imr_address.s_addr;
|
|
err = 0;
|
|
break;
|
|
}
|
|
|
|
case IP_ADD_MEMBERSHIP:
|
|
case IP_DROP_MEMBERSHIP:
|
|
{
|
|
struct ip_mreqn mreq;
|
|
|
|
err = -EPROTO;
|
|
if (inet_sk(sk)->is_icsk)
|
|
break;
|
|
|
|
if (optlen < sizeof(struct ip_mreq))
|
|
goto e_inval;
|
|
err = -EFAULT;
|
|
if (optlen >= sizeof(struct ip_mreqn)) {
|
|
if (copy_from_user(&mreq, optval, sizeof(mreq)))
|
|
break;
|
|
} else {
|
|
memset(&mreq, 0, sizeof(mreq));
|
|
if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
|
|
break;
|
|
}
|
|
|
|
if (optname == IP_ADD_MEMBERSHIP)
|
|
err = ip_mc_join_group(sk, &mreq);
|
|
else
|
|
err = ip_mc_leave_group(sk, &mreq);
|
|
break;
|
|
}
|
|
case IP_MSFILTER:
|
|
{
|
|
struct ip_msfilter *msf;
|
|
|
|
if (optlen < IP_MSFILTER_SIZE(0))
|
|
goto e_inval;
|
|
if (optlen > sysctl_optmem_max) {
|
|
err = -ENOBUFS;
|
|
break;
|
|
}
|
|
msf = memdup_user(optval, optlen);
|
|
if (IS_ERR(msf)) {
|
|
err = PTR_ERR(msf);
|
|
break;
|
|
}
|
|
/* numsrc >= (1G-4) overflow in 32 bits */
|
|
if (msf->imsf_numsrc >= 0x3ffffffcU ||
|
|
msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
|
|
kfree(msf);
|
|
err = -ENOBUFS;
|
|
break;
|
|
}
|
|
if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
|
|
kfree(msf);
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
err = ip_mc_msfilter(sk, msf, 0);
|
|
kfree(msf);
|
|
break;
|
|
}
|
|
case IP_BLOCK_SOURCE:
|
|
case IP_UNBLOCK_SOURCE:
|
|
case IP_ADD_SOURCE_MEMBERSHIP:
|
|
case IP_DROP_SOURCE_MEMBERSHIP:
|
|
{
|
|
struct ip_mreq_source mreqs;
|
|
int omode, add;
|
|
|
|
if (optlen != sizeof(struct ip_mreq_source))
|
|
goto e_inval;
|
|
if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
if (optname == IP_BLOCK_SOURCE) {
|
|
omode = MCAST_EXCLUDE;
|
|
add = 1;
|
|
} else if (optname == IP_UNBLOCK_SOURCE) {
|
|
omode = MCAST_EXCLUDE;
|
|
add = 0;
|
|
} else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
|
|
struct ip_mreqn mreq;
|
|
|
|
mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
|
|
mreq.imr_address.s_addr = mreqs.imr_interface;
|
|
mreq.imr_ifindex = 0;
|
|
err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE);
|
|
if (err && err != -EADDRINUSE)
|
|
break;
|
|
omode = MCAST_INCLUDE;
|
|
add = 1;
|
|
} else /* IP_DROP_SOURCE_MEMBERSHIP */ {
|
|
omode = MCAST_INCLUDE;
|
|
add = 0;
|
|
}
|
|
err = ip_mc_source(add, omode, sk, &mreqs, 0);
|
|
break;
|
|
}
|
|
case MCAST_JOIN_GROUP:
|
|
case MCAST_LEAVE_GROUP:
|
|
{
|
|
struct group_req greq;
|
|
struct sockaddr_in *psin;
|
|
struct ip_mreqn mreq;
|
|
|
|
if (optlen < sizeof(struct group_req))
|
|
goto e_inval;
|
|
err = -EFAULT;
|
|
if (copy_from_user(&greq, optval, sizeof(greq)))
|
|
break;
|
|
psin = (struct sockaddr_in *)&greq.gr_group;
|
|
if (psin->sin_family != AF_INET)
|
|
goto e_inval;
|
|
memset(&mreq, 0, sizeof(mreq));
|
|
mreq.imr_multiaddr = psin->sin_addr;
|
|
mreq.imr_ifindex = greq.gr_interface;
|
|
|
|
if (optname == MCAST_JOIN_GROUP)
|
|
err = ip_mc_join_group(sk, &mreq);
|
|
else
|
|
err = ip_mc_leave_group(sk, &mreq);
|
|
break;
|
|
}
|
|
case MCAST_JOIN_SOURCE_GROUP:
|
|
case MCAST_LEAVE_SOURCE_GROUP:
|
|
case MCAST_BLOCK_SOURCE:
|
|
case MCAST_UNBLOCK_SOURCE:
|
|
{
|
|
struct group_source_req greqs;
|
|
struct ip_mreq_source mreqs;
|
|
struct sockaddr_in *psin;
|
|
int omode, add;
|
|
|
|
if (optlen != sizeof(struct group_source_req))
|
|
goto e_inval;
|
|
if (copy_from_user(&greqs, optval, sizeof(greqs))) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
if (greqs.gsr_group.ss_family != AF_INET ||
|
|
greqs.gsr_source.ss_family != AF_INET) {
|
|
err = -EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
psin = (struct sockaddr_in *)&greqs.gsr_group;
|
|
mreqs.imr_multiaddr = psin->sin_addr.s_addr;
|
|
psin = (struct sockaddr_in *)&greqs.gsr_source;
|
|
mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
|
|
mreqs.imr_interface = 0; /* use index for mc_source */
|
|
|
|
if (optname == MCAST_BLOCK_SOURCE) {
|
|
omode = MCAST_EXCLUDE;
|
|
add = 1;
|
|
} else if (optname == MCAST_UNBLOCK_SOURCE) {
|
|
omode = MCAST_EXCLUDE;
|
|
add = 0;
|
|
} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
|
|
struct ip_mreqn mreq;
|
|
|
|
psin = (struct sockaddr_in *)&greqs.gsr_group;
|
|
mreq.imr_multiaddr = psin->sin_addr;
|
|
mreq.imr_address.s_addr = 0;
|
|
mreq.imr_ifindex = greqs.gsr_interface;
|
|
err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE);
|
|
if (err && err != -EADDRINUSE)
|
|
break;
|
|
greqs.gsr_interface = mreq.imr_ifindex;
|
|
omode = MCAST_INCLUDE;
|
|
add = 1;
|
|
} else /* MCAST_LEAVE_SOURCE_GROUP */ {
|
|
omode = MCAST_INCLUDE;
|
|
add = 0;
|
|
}
|
|
err = ip_mc_source(add, omode, sk, &mreqs,
|
|
greqs.gsr_interface);
|
|
break;
|
|
}
|
|
case MCAST_MSFILTER:
|
|
{
|
|
struct sockaddr_in *psin;
|
|
struct ip_msfilter *msf = NULL;
|
|
struct group_filter *gsf = NULL;
|
|
int msize, i, ifindex;
|
|
|
|
if (optlen < GROUP_FILTER_SIZE(0))
|
|
goto e_inval;
|
|
if (optlen > sysctl_optmem_max) {
|
|
err = -ENOBUFS;
|
|
break;
|
|
}
|
|
gsf = memdup_user(optval, optlen);
|
|
if (IS_ERR(gsf)) {
|
|
err = PTR_ERR(gsf);
|
|
break;
|
|
}
|
|
|
|
/* numsrc >= (4G-140)/128 overflow in 32 bits */
|
|
if (gsf->gf_numsrc >= 0x1ffffff ||
|
|
gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
|
|
err = -ENOBUFS;
|
|
goto mc_msf_out;
|
|
}
|
|
if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
|
|
err = -EINVAL;
|
|
goto mc_msf_out;
|
|
}
|
|
msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
|
|
msf = kmalloc(msize, GFP_KERNEL);
|
|
if (!msf) {
|
|
err = -ENOBUFS;
|
|
goto mc_msf_out;
|
|
}
|
|
ifindex = gsf->gf_interface;
|
|
psin = (struct sockaddr_in *)&gsf->gf_group;
|
|
if (psin->sin_family != AF_INET) {
|
|
err = -EADDRNOTAVAIL;
|
|
goto mc_msf_out;
|
|
}
|
|
msf->imsf_multiaddr = psin->sin_addr.s_addr;
|
|
msf->imsf_interface = 0;
|
|
msf->imsf_fmode = gsf->gf_fmode;
|
|
msf->imsf_numsrc = gsf->gf_numsrc;
|
|
err = -EADDRNOTAVAIL;
|
|
for (i = 0; i < gsf->gf_numsrc; ++i) {
|
|
psin = (struct sockaddr_in *)&gsf->gf_slist[i];
|
|
|
|
if (psin->sin_family != AF_INET)
|
|
goto mc_msf_out;
|
|
msf->imsf_slist[i] = psin->sin_addr.s_addr;
|
|
}
|
|
kfree(gsf);
|
|
gsf = NULL;
|
|
|
|
err = ip_mc_msfilter(sk, msf, ifindex);
|
|
mc_msf_out:
|
|
kfree(msf);
|
|
kfree(gsf);
|
|
break;
|
|
}
|
|
case IP_MULTICAST_ALL:
|
|
if (optlen < 1)
|
|
goto e_inval;
|
|
if (val != 0 && val != 1)
|
|
goto e_inval;
|
|
inet->mc_all = val;
|
|
break;
|
|
|
|
case IP_FREEBIND:
|
|
if (optlen < 1)
|
|
goto e_inval;
|
|
inet->freebind = !!val;
|
|
break;
|
|
|
|
case IP_IPSEC_POLICY:
|
|
case IP_XFRM_POLICY:
|
|
err = -EPERM;
|
|
if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
|
|
break;
|
|
err = xfrm_user_policy(sk, optname, optval, optlen);
|
|
break;
|
|
|
|
case IP_TRANSPARENT:
|
|
if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
|
|
!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
|
|
err = -EPERM;
|
|
break;
|
|
}
|
|
if (optlen < 1)
|
|
goto e_inval;
|
|
inet->transparent = !!val;
|
|
break;
|
|
|
|
case IP_MINTTL:
|
|
if (optlen < 1)
|
|
goto e_inval;
|
|
if (val < 0 || val > 255)
|
|
goto e_inval;
|
|
inet->min_ttl = val;
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
release_sock(sk);
|
|
if (needs_rtnl)
|
|
rtnl_unlock();
|
|
return err;
|
|
|
|
e_inval:
|
|
release_sock(sk);
|
|
if (needs_rtnl)
|
|
rtnl_unlock();
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* ipv4_pktinfo_prepare - transfer some info from rtable to skb
|
|
* @sk: socket
|
|
* @skb: buffer
|
|
*
|
|
* To support IP_CMSG_PKTINFO option, we store rt_iif and specific
|
|
* destination in skb->cb[] before dst drop.
|
|
* This way, receiver doesn't make cache line misses to read rtable.
|
|
*/
|
|
void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
|
|
bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
|
|
ipv6_sk_rxinfo(sk);
|
|
|
|
if (prepare && skb_rtable(skb)) {
|
|
/* skb->cb is overloaded: prior to this point it is IP{6}CB
|
|
* which has interface index (iif) as the first member of the
|
|
* underlying inet{6}_skb_parm struct. This code then overlays
|
|
* PKTINFO_SKB_CB and in_pktinfo also has iif as the first
|
|
* element so the iif is picked up from the prior IPCB. If iif
|
|
* is the loopback interface, then return the sending interface
|
|
* (e.g., process binds socket to eth0 for Tx which is
|
|
* redirected to loopback in the rtable/dst).
|
|
*/
|
|
struct rtable *rt = skb_rtable(skb);
|
|
bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags);
|
|
|
|
if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX)
|
|
pktinfo->ipi_ifindex = inet_iif(skb);
|
|
else if (l3slave && rt && rt->rt_iif)
|
|
pktinfo->ipi_ifindex = rt->rt_iif;
|
|
|
|
pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
|
|
} else {
|
|
pktinfo->ipi_ifindex = 0;
|
|
pktinfo->ipi_spec_dst.s_addr = 0;
|
|
}
|
|
skb_dst_drop(skb);
|
|
}
|
|
|
|
int ip_setsockopt(struct sock *sk, int level,
|
|
int optname, char __user *optval, unsigned int optlen)
|
|
{
|
|
int err;
|
|
|
|
if (level != SOL_IP)
|
|
return -ENOPROTOOPT;
|
|
|
|
err = do_ip_setsockopt(sk, level, optname, optval, optlen);
|
|
#if IS_ENABLED(CONFIG_BPFILTER_UMH)
|
|
if (optname >= BPFILTER_IPT_SO_SET_REPLACE &&
|
|
optname < BPFILTER_IPT_SET_MAX)
|
|
err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen);
|
|
#endif
|
|
#ifdef CONFIG_NETFILTER
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
|
if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
|
|
optname != IP_IPSEC_POLICY &&
|
|
optname != IP_XFRM_POLICY &&
|
|
!ip_mroute_opt(optname))
|
|
err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
|
|
#endif
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(ip_setsockopt);
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
int compat_ip_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
int err;
|
|
|
|
if (level != SOL_IP)
|
|
return -ENOPROTOOPT;
|
|
|
|
if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
|
|
return compat_mc_setsockopt(sk, level, optname, optval, optlen,
|
|
ip_setsockopt);
|
|
|
|
err = do_ip_setsockopt(sk, level, optname, optval, optlen);
|
|
#ifdef CONFIG_NETFILTER
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
|
if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
|
|
optname != IP_IPSEC_POLICY &&
|
|
optname != IP_XFRM_POLICY &&
|
|
!ip_mroute_opt(optname))
|
|
err = compat_nf_setsockopt(sk, PF_INET, optname, optval,
|
|
optlen);
|
|
#endif
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(compat_ip_setsockopt);
|
|
#endif
|
|
|
|
/*
|
|
* Get the options. Note for future reference. The GET of IP options gets
|
|
* the _received_ ones. The set sets the _sent_ ones.
|
|
*/
|
|
|
|
static bool getsockopt_needs_rtnl(int optname)
|
|
{
|
|
switch (optname) {
|
|
case IP_MSFILTER:
|
|
case MCAST_MSFILTER:
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static int do_ip_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen, unsigned int flags)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
bool needs_rtnl = getsockopt_needs_rtnl(optname);
|
|
int val, err = 0;
|
|
int len;
|
|
|
|
if (level != SOL_IP)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (ip_mroute_opt(optname))
|
|
return ip_mroute_getsockopt(sk, optname, optval, optlen);
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
if (len < 0)
|
|
return -EINVAL;
|
|
|
|
if (needs_rtnl)
|
|
rtnl_lock();
|
|
lock_sock(sk);
|
|
|
|
switch (optname) {
|
|
case IP_OPTIONS:
|
|
{
|
|
unsigned char optbuf[sizeof(struct ip_options)+40];
|
|
struct ip_options *opt = (struct ip_options *)optbuf;
|
|
struct ip_options_rcu *inet_opt;
|
|
|
|
inet_opt = rcu_dereference_protected(inet->inet_opt,
|
|
lockdep_sock_is_held(sk));
|
|
opt->optlen = 0;
|
|
if (inet_opt)
|
|
memcpy(optbuf, &inet_opt->opt,
|
|
sizeof(struct ip_options) +
|
|
inet_opt->opt.optlen);
|
|
release_sock(sk);
|
|
|
|
if (opt->optlen == 0)
|
|
return put_user(0, optlen);
|
|
|
|
ip_options_undo(opt);
|
|
|
|
len = min_t(unsigned int, len, opt->optlen);
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, opt->__data, len))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
case IP_PKTINFO:
|
|
val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
|
|
break;
|
|
case IP_RECVTTL:
|
|
val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
|
|
break;
|
|
case IP_RECVTOS:
|
|
val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
|
|
break;
|
|
case IP_RECVOPTS:
|
|
val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
|
|
break;
|
|
case IP_RETOPTS:
|
|
val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
|
|
break;
|
|
case IP_PASSSEC:
|
|
val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
|
|
break;
|
|
case IP_RECVORIGDSTADDR:
|
|
val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
|
|
break;
|
|
case IP_CHECKSUM:
|
|
val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
|
|
break;
|
|
case IP_RECVFRAGSIZE:
|
|
val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0;
|
|
break;
|
|
case IP_TOS:
|
|
val = inet->tos;
|
|
break;
|
|
case IP_TTL:
|
|
{
|
|
struct net *net = sock_net(sk);
|
|
val = (inet->uc_ttl == -1 ?
|
|
net->ipv4.sysctl_ip_default_ttl :
|
|
inet->uc_ttl);
|
|
break;
|
|
}
|
|
case IP_HDRINCL:
|
|
val = inet->hdrincl;
|
|
break;
|
|
case IP_NODEFRAG:
|
|
val = inet->nodefrag;
|
|
break;
|
|
case IP_BIND_ADDRESS_NO_PORT:
|
|
val = inet->bind_address_no_port;
|
|
break;
|
|
case IP_MTU_DISCOVER:
|
|
val = inet->pmtudisc;
|
|
break;
|
|
case IP_MTU:
|
|
{
|
|
struct dst_entry *dst;
|
|
val = 0;
|
|
dst = sk_dst_get(sk);
|
|
if (dst) {
|
|
val = dst_mtu(dst);
|
|
dst_release(dst);
|
|
}
|
|
if (!val) {
|
|
release_sock(sk);
|
|
return -ENOTCONN;
|
|
}
|
|
break;
|
|
}
|
|
case IP_RECVERR:
|
|
val = inet->recverr;
|
|
break;
|
|
case IP_MULTICAST_TTL:
|
|
val = inet->mc_ttl;
|
|
break;
|
|
case IP_MULTICAST_LOOP:
|
|
val = inet->mc_loop;
|
|
break;
|
|
case IP_UNICAST_IF:
|
|
val = (__force int)htonl((__u32) inet->uc_index);
|
|
break;
|
|
case IP_MULTICAST_IF:
|
|
{
|
|
struct in_addr addr;
|
|
len = min_t(unsigned int, len, sizeof(struct in_addr));
|
|
addr.s_addr = inet->mc_addr;
|
|
release_sock(sk);
|
|
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, &addr, len))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
case IP_MSFILTER:
|
|
{
|
|
struct ip_msfilter msf;
|
|
|
|
if (len < IP_MSFILTER_SIZE(0)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
|
|
err = -EFAULT;
|
|
goto out;
|
|
}
|
|
err = ip_mc_msfget(sk, &msf,
|
|
(struct ip_msfilter __user *)optval, optlen);
|
|
goto out;
|
|
}
|
|
case MCAST_MSFILTER:
|
|
{
|
|
struct group_filter gsf;
|
|
|
|
if (len < GROUP_FILTER_SIZE(0)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
|
|
err = -EFAULT;
|
|
goto out;
|
|
}
|
|
err = ip_mc_gsfget(sk, &gsf,
|
|
(struct group_filter __user *)optval,
|
|
optlen);
|
|
goto out;
|
|
}
|
|
case IP_MULTICAST_ALL:
|
|
val = inet->mc_all;
|
|
break;
|
|
case IP_PKTOPTIONS:
|
|
{
|
|
struct msghdr msg;
|
|
|
|
release_sock(sk);
|
|
|
|
if (sk->sk_type != SOCK_STREAM)
|
|
return -ENOPROTOOPT;
|
|
|
|
msg.msg_control = (__force void *) optval;
|
|
msg.msg_controllen = len;
|
|
msg.msg_flags = flags;
|
|
|
|
if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
|
|
struct in_pktinfo info;
|
|
|
|
info.ipi_addr.s_addr = inet->inet_rcv_saddr;
|
|
info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
|
|
info.ipi_ifindex = inet->mc_index;
|
|
put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
|
|
}
|
|
if (inet->cmsg_flags & IP_CMSG_TTL) {
|
|
int hlim = inet->mc_ttl;
|
|
put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
|
|
}
|
|
if (inet->cmsg_flags & IP_CMSG_TOS) {
|
|
int tos = inet->rcv_tos;
|
|
put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
|
|
}
|
|
len -= msg.msg_controllen;
|
|
return put_user(len, optlen);
|
|
}
|
|
case IP_FREEBIND:
|
|
val = inet->freebind;
|
|
break;
|
|
case IP_TRANSPARENT:
|
|
val = inet->transparent;
|
|
break;
|
|
case IP_MINTTL:
|
|
val = inet->min_ttl;
|
|
break;
|
|
default:
|
|
release_sock(sk);
|
|
return -ENOPROTOOPT;
|
|
}
|
|
release_sock(sk);
|
|
|
|
if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
|
|
unsigned char ucval = (unsigned char)val;
|
|
len = 1;
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, &ucval, 1))
|
|
return -EFAULT;
|
|
} else {
|
|
len = min_t(unsigned int, sizeof(int), len);
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, &val, len))
|
|
return -EFAULT;
|
|
}
|
|
return 0;
|
|
|
|
out:
|
|
release_sock(sk);
|
|
if (needs_rtnl)
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
|
|
int ip_getsockopt(struct sock *sk, int level,
|
|
int optname, char __user *optval, int __user *optlen)
|
|
{
|
|
int err;
|
|
|
|
err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
|
|
#if IS_ENABLED(CONFIG_BPFILTER_UMH)
|
|
if (optname >= BPFILTER_IPT_SO_GET_INFO &&
|
|
optname < BPFILTER_IPT_GET_MAX)
|
|
err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen);
|
|
#endif
|
|
#ifdef CONFIG_NETFILTER
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
|
if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
|
|
!ip_mroute_opt(optname)) {
|
|
int len;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
err = nf_getsockopt(sk, PF_INET, optname, optval, &len);
|
|
if (err >= 0)
|
|
err = put_user(len, optlen);
|
|
return err;
|
|
}
|
|
#endif
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(ip_getsockopt);
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
int compat_ip_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
int err;
|
|
|
|
if (optname == MCAST_MSFILTER)
|
|
return compat_mc_getsockopt(sk, level, optname, optval, optlen,
|
|
ip_getsockopt);
|
|
|
|
err = do_ip_getsockopt(sk, level, optname, optval, optlen,
|
|
MSG_CMSG_COMPAT);
|
|
|
|
#if IS_ENABLED(CONFIG_BPFILTER_UMH)
|
|
if (optname >= BPFILTER_IPT_SO_GET_INFO &&
|
|
optname < BPFILTER_IPT_GET_MAX)
|
|
err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen);
|
|
#endif
|
|
#ifdef CONFIG_NETFILTER
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
|
if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
|
|
!ip_mroute_opt(optname)) {
|
|
int len;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
|
|
if (err >= 0)
|
|
err = put_user(len, optlen);
|
|
return err;
|
|
}
|
|
#endif
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(compat_ip_getsockopt);
|
|
#endif
|