mirror of https://gitee.com/openkylin/linux.git
589 lines
17 KiB
C
589 lines
17 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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* Definitions for the IP module.
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*
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* Version: @(#)ip.h 1.0.2 05/07/93
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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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* Changes:
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* Mike McLagan : Routing by source
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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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#ifndef _IP_H
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#define _IP_H
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#include <linux/types.h>
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#include <linux/ip.h>
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#include <linux/in.h>
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#include <linux/skbuff.h>
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#include <net/inet_sock.h>
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#include <net/route.h>
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#include <net/snmp.h>
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#include <net/flow.h>
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#include <net/flow_dissector.h>
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struct sock;
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struct inet_skb_parm {
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struct ip_options opt; /* Compiled IP options */
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unsigned char flags;
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#define IPSKB_FORWARDED BIT(0)
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#define IPSKB_XFRM_TUNNEL_SIZE BIT(1)
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#define IPSKB_XFRM_TRANSFORMED BIT(2)
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#define IPSKB_FRAG_COMPLETE BIT(3)
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#define IPSKB_REROUTED BIT(4)
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#define IPSKB_DOREDIRECT BIT(5)
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#define IPSKB_FRAG_PMTU BIT(6)
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u16 frag_max_size;
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};
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static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
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{
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return ip_hdr(skb)->ihl * 4;
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}
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struct ipcm_cookie {
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__be32 addr;
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int oif;
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struct ip_options_rcu *opt;
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__u8 tx_flags;
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__u8 ttl;
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__s16 tos;
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char priority;
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};
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#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
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#define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
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struct ip_ra_chain {
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struct ip_ra_chain __rcu *next;
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struct sock *sk;
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union {
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void (*destructor)(struct sock *);
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struct sock *saved_sk;
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};
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struct rcu_head rcu;
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};
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extern struct ip_ra_chain __rcu *ip_ra_chain;
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/* IP flags. */
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#define IP_CE 0x8000 /* Flag: "Congestion" */
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#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
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#define IP_MF 0x2000 /* Flag: "More Fragments" */
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#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
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#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
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struct msghdr;
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struct net_device;
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struct packet_type;
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struct rtable;
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struct sockaddr;
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int igmp_mc_init(void);
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/*
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* Functions provided by ip.c
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*/
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int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
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__be32 saddr, __be32 daddr,
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struct ip_options_rcu *opt);
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int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
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struct net_device *orig_dev);
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int ip_local_deliver(struct sk_buff *skb);
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int ip_mr_input(struct sk_buff *skb);
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int ip_output(struct sock *sk, struct sk_buff *skb);
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int ip_mc_output(struct sock *sk, struct sk_buff *skb);
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int ip_do_fragment(struct sock *sk, struct sk_buff *skb,
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int (*output)(struct sock *, struct sk_buff *));
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void ip_send_check(struct iphdr *ip);
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int __ip_local_out(struct sk_buff *skb);
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int ip_local_out_sk(struct sock *sk, struct sk_buff *skb);
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static inline int ip_local_out(struct sk_buff *skb)
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{
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return ip_local_out_sk(skb->sk, skb);
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}
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int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
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void ip_init(void);
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int ip_append_data(struct sock *sk, struct flowi4 *fl4,
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int getfrag(void *from, char *to, int offset, int len,
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int odd, struct sk_buff *skb),
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void *from, int len, int protolen,
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struct ipcm_cookie *ipc,
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struct rtable **rt,
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unsigned int flags);
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int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
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struct sk_buff *skb);
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ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
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int offset, size_t size, int flags);
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struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
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struct sk_buff_head *queue,
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struct inet_cork *cork);
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int ip_send_skb(struct net *net, struct sk_buff *skb);
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int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
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void ip_flush_pending_frames(struct sock *sk);
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struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
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int getfrag(void *from, char *to, int offset,
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int len, int odd, struct sk_buff *skb),
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void *from, int length, int transhdrlen,
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struct ipcm_cookie *ipc, struct rtable **rtp,
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unsigned int flags);
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static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
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{
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return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
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}
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static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
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{
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return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
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}
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static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
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{
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return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
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}
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/* datagram.c */
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int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
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void ip4_datagram_release_cb(struct sock *sk);
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struct ip_reply_arg {
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struct kvec iov[1];
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int flags;
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__wsum csum;
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int csumoffset; /* u16 offset of csum in iov[0].iov_base */
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/* -1 if not needed */
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int bound_dev_if;
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u8 tos;
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};
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#define IP_REPLY_ARG_NOSRCCHECK 1
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static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
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{
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return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
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}
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void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
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const struct ip_options *sopt,
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__be32 daddr, __be32 saddr,
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const struct ip_reply_arg *arg,
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unsigned int len);
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#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
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#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
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#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
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#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
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#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
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#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
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#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
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#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
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#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
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#define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
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#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
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#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
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unsigned long snmp_fold_field(void __percpu *mib, int offt);
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#if BITS_PER_LONG==32
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u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
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#else
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static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
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{
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return snmp_fold_field(mib, offt);
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}
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#endif
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void inet_get_local_port_range(struct net *net, int *low, int *high);
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#ifdef CONFIG_SYSCTL
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static inline int inet_is_local_reserved_port(struct net *net, int port)
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{
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if (!net->ipv4.sysctl_local_reserved_ports)
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return 0;
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return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
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}
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static inline bool sysctl_dev_name_is_allowed(const char *name)
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{
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return strcmp(name, "default") != 0 && strcmp(name, "all") != 0;
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}
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#else
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static inline int inet_is_local_reserved_port(struct net *net, int port)
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{
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return 0;
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}
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#endif
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/* From inetpeer.c */
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extern int inet_peer_threshold;
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extern int inet_peer_minttl;
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extern int inet_peer_maxttl;
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/* From ip_input.c */
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extern int sysctl_ip_early_demux;
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/* From ip_output.c */
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extern int sysctl_ip_dynaddr;
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void ipfrag_init(void);
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void ip_static_sysctl_init(void);
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#define IP4_REPLY_MARK(net, mark) \
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((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
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static inline bool ip_is_fragment(const struct iphdr *iph)
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{
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return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
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}
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#ifdef CONFIG_INET
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#include <net/dst.h>
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/* The function in 2.2 was invalid, producing wrong result for
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* check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
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static inline
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int ip_decrease_ttl(struct iphdr *iph)
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{
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u32 check = (__force u32)iph->check;
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check += (__force u32)htons(0x0100);
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iph->check = (__force __sum16)(check + (check>=0xFFFF));
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return --iph->ttl;
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}
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static inline
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int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
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{
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return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
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(inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
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!(dst_metric_locked(dst, RTAX_MTU)));
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}
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static inline bool ip_sk_accept_pmtu(const struct sock *sk)
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{
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return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
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inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
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}
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static inline bool ip_sk_use_pmtu(const struct sock *sk)
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{
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return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
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}
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static inline bool ip_sk_ignore_df(const struct sock *sk)
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{
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return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
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inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
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}
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static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
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bool forwarding)
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{
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struct net *net = dev_net(dst->dev);
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if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
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dst_metric_locked(dst, RTAX_MTU) ||
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!forwarding)
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return dst_mtu(dst);
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return min(dst->dev->mtu, IP_MAX_MTU);
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}
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static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb)
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{
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if (!skb->sk || ip_sk_use_pmtu(skb->sk)) {
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bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
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return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
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} else {
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return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU);
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}
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}
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u32 ip_idents_reserve(u32 hash, int segs);
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void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);
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static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb,
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struct sock *sk, int segs)
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{
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struct iphdr *iph = ip_hdr(skb);
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if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
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/* This is only to work around buggy Windows95/2000
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* VJ compression implementations. If the ID field
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* does not change, they drop every other packet in
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* a TCP stream using header compression.
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*/
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if (sk && inet_sk(sk)->inet_daddr) {
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iph->id = htons(inet_sk(sk)->inet_id);
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inet_sk(sk)->inet_id += segs;
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} else {
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iph->id = 0;
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}
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} else {
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__ip_select_ident(net, iph, segs);
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}
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}
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static inline void ip_select_ident(struct net *net, struct sk_buff *skb,
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struct sock *sk)
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{
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ip_select_ident_segs(net, skb, sk, 1);
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}
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static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
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{
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return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
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skb->len, proto, 0);
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}
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/* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store
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* Equivalent to : flow->v4addrs.src = iph->saddr;
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* flow->v4addrs.dst = iph->daddr;
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*/
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static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow,
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const struct iphdr *iph)
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{
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BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) !=
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offsetof(typeof(flow->addrs), v4addrs.src) +
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sizeof(flow->addrs.v4addrs.src));
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memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs));
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flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
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}
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static inline void inet_set_txhash(struct sock *sk)
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{
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struct inet_sock *inet = inet_sk(sk);
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struct flow_keys keys;
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memset(&keys, 0, sizeof(keys));
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keys.addrs.v4addrs.src = inet->inet_saddr;
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keys.addrs.v4addrs.dst = inet->inet_daddr;
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keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
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keys.ports.src = inet->inet_sport;
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keys.ports.dst = inet->inet_dport;
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sk->sk_txhash = flow_hash_from_keys(&keys);
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}
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static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
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{
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const struct iphdr *iph = skb_gro_network_header(skb);
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return csum_tcpudp_nofold(iph->saddr, iph->daddr,
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skb_gro_len(skb), proto, 0);
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}
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/*
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* Map a multicast IP onto multicast MAC for type ethernet.
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*/
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static inline void ip_eth_mc_map(__be32 naddr, char *buf)
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{
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__u32 addr=ntohl(naddr);
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buf[0]=0x01;
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buf[1]=0x00;
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buf[2]=0x5e;
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buf[5]=addr&0xFF;
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addr>>=8;
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buf[4]=addr&0xFF;
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addr>>=8;
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buf[3]=addr&0x7F;
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}
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/*
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* Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
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* Leave P_Key as 0 to be filled in by driver.
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*/
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static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
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{
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__u32 addr;
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unsigned char scope = broadcast[5] & 0xF;
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buf[0] = 0; /* Reserved */
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buf[1] = 0xff; /* Multicast QPN */
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buf[2] = 0xff;
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buf[3] = 0xff;
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addr = ntohl(naddr);
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buf[4] = 0xff;
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buf[5] = 0x10 | scope; /* scope from broadcast address */
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buf[6] = 0x40; /* IPv4 signature */
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buf[7] = 0x1b;
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buf[8] = broadcast[8]; /* P_Key */
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buf[9] = broadcast[9];
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buf[10] = 0;
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buf[11] = 0;
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buf[12] = 0;
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buf[13] = 0;
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buf[14] = 0;
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buf[15] = 0;
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buf[19] = addr & 0xff;
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addr >>= 8;
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buf[18] = addr & 0xff;
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addr >>= 8;
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buf[17] = addr & 0xff;
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addr >>= 8;
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buf[16] = addr & 0x0f;
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}
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static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
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{
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if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
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memcpy(buf, broadcast, 4);
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else
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memcpy(buf, &naddr, sizeof(naddr));
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}
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#if IS_ENABLED(CONFIG_IPV6)
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#include <linux/ipv6.h>
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#endif
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static __inline__ void inet_reset_saddr(struct sock *sk)
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{
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inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
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#if IS_ENABLED(CONFIG_IPV6)
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if (sk->sk_family == PF_INET6) {
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struct ipv6_pinfo *np = inet6_sk(sk);
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memset(&np->saddr, 0, sizeof(np->saddr));
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memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
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}
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#endif
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}
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#endif
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bool ip_call_ra_chain(struct sk_buff *skb);
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/*
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* Functions provided by ip_fragment.c
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*/
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enum ip_defrag_users {
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IP_DEFRAG_LOCAL_DELIVER,
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IP_DEFRAG_CALL_RA_CHAIN,
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IP_DEFRAG_CONNTRACK_IN,
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__IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
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IP_DEFRAG_CONNTRACK_OUT,
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__IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
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IP_DEFRAG_CONNTRACK_BRIDGE_IN,
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__IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
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IP_DEFRAG_VS_IN,
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IP_DEFRAG_VS_OUT,
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IP_DEFRAG_VS_FWD,
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IP_DEFRAG_AF_PACKET,
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IP_DEFRAG_MACVLAN,
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};
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/* Return true if the value of 'user' is between 'lower_bond'
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* and 'upper_bond' inclusively.
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*/
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static inline bool ip_defrag_user_in_between(u32 user,
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enum ip_defrag_users lower_bond,
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enum ip_defrag_users upper_bond)
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{
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return user >= lower_bond && user <= upper_bond;
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}
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int ip_defrag(struct sk_buff *skb, u32 user);
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#ifdef CONFIG_INET
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struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
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#else
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static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
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{
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return skb;
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}
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#endif
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int ip_frag_mem(struct net *net);
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/*
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* Functions provided by ip_forward.c
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*/
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int ip_forward(struct sk_buff *skb);
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/*
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* Functions provided by ip_options.c
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*/
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void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
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__be32 daddr, struct rtable *rt, int is_frag);
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int __ip_options_echo(struct ip_options *dopt, struct sk_buff *skb,
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const struct ip_options *sopt);
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static inline int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb)
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{
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return __ip_options_echo(dopt, skb, &IPCB(skb)->opt);
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}
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void ip_options_fragment(struct sk_buff *skb);
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int ip_options_compile(struct net *net, struct ip_options *opt,
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struct sk_buff *skb);
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int ip_options_get(struct net *net, struct ip_options_rcu **optp,
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unsigned char *data, int optlen);
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int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
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unsigned char __user *data, int optlen);
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void ip_options_undo(struct ip_options *opt);
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void ip_forward_options(struct sk_buff *skb);
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int ip_options_rcv_srr(struct sk_buff *skb);
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/*
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* Functions provided by ip_sockglue.c
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*/
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void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
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void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, int offset);
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int ip_cmsg_send(struct net *net, struct msghdr *msg,
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struct ipcm_cookie *ipc, bool allow_ipv6);
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int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
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unsigned int optlen);
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int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
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int __user *optlen);
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int compat_ip_setsockopt(struct sock *sk, int level, int optname,
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char __user *optval, unsigned int optlen);
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int compat_ip_getsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int __user *optlen);
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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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int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
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void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
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u32 info, u8 *payload);
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void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
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u32 info);
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static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
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{
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ip_cmsg_recv_offset(msg, skb, 0);
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}
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bool icmp_global_allow(void);
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extern int sysctl_icmp_msgs_per_sec;
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extern int sysctl_icmp_msgs_burst;
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#ifdef CONFIG_PROC_FS
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int ip_misc_proc_init(void);
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#endif
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#endif /* _IP_H */
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