413 lines
12 KiB
C
413 lines
12 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/snmp.h>
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#include <net/flow.h>
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struct sock;
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struct inet_skb_parm
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{
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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 1
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#define IPSKB_XFRM_TUNNEL_SIZE 2
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#define IPSKB_XFRM_TRANSFORMED 4
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#define IPSKB_FRAG_COMPLETE 8
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#define IPSKB_REROUTED 16
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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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{
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__be32 addr;
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int oif;
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struct ip_options *opt;
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union skb_shared_tx shtx;
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};
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#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
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struct ip_ra_chain
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{
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struct ip_ra_chain *next;
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struct sock *sk;
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void (*destructor)(struct sock *);
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};
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extern struct ip_ra_chain *ip_ra_chain;
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extern rwlock_t ip_ra_lock;
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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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extern int igmp_mc_proc_init(void);
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/*
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* Functions provided by ip.c
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*/
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extern 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 *opt);
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extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt, struct net_device *orig_dev);
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extern int ip_local_deliver(struct sk_buff *skb);
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extern int ip_mr_input(struct sk_buff *skb);
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extern int ip_output(struct sk_buff *skb);
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extern int ip_mc_output(struct sk_buff *skb);
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extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
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extern int ip_do_nat(struct sk_buff *skb);
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extern void ip_send_check(struct iphdr *ip);
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extern int __ip_local_out(struct sk_buff *skb);
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extern int ip_local_out(struct sk_buff *skb);
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extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok);
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extern void ip_init(void);
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extern int ip_append_data(struct sock *sk,
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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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extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
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extern ssize_t ip_append_page(struct sock *sk, struct page *page,
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int offset, size_t size, int flags);
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extern int ip_push_pending_frames(struct sock *sk);
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extern void ip_flush_pending_frames(struct sock *sk);
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/* datagram.c */
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extern int ip4_datagram_connect(struct sock *sk,
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struct sockaddr *uaddr, int addr_len);
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/*
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* Map a multicast IP onto multicast MAC for type Token Ring.
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* This conforms to RFC1469 Option 2 Multicasting i.e.
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* using a functional address to transmit / receive
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* multicast packets.
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*/
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static inline void ip_tr_mc_map(__be32 addr, char *buf)
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{
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buf[0]=0xC0;
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buf[1]=0x00;
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buf[2]=0x00;
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buf[3]=0x04;
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buf[4]=0x00;
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buf[5]=0x00;
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}
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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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};
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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_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
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unsigned int len);
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struct ipv4_config
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{
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int log_martians;
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int no_pmtu_disc;
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};
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extern struct ipv4_config ipv4_config;
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#define IP_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.ip_statistics, field)
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#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.ip_statistics, field)
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#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.ip_statistics, field, val)
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#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS_BH((net)->mib.ip_statistics, field, val)
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#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS((net)->mib.ip_statistics, field, val)
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#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS_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_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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extern unsigned long snmp_fold_field(void *mib[], int offt);
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extern int snmp_mib_init(void *ptr[2], size_t mibsize);
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extern void snmp_mib_free(void *ptr[2]);
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extern struct local_ports {
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seqlock_t lock;
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int range[2];
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} sysctl_local_ports;
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extern void inet_get_local_port_range(int *low, int *high);
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extern int sysctl_ip_default_ttl;
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extern int sysctl_ip_nonlocal_bind;
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extern struct ctl_path net_core_path[];
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extern struct ctl_path net_ipv4_ctl_path[];
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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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extern int inet_peer_gc_mintime;
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extern int inet_peer_gc_maxtime;
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/* From ip_output.c */
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extern int sysctl_ip_dynaddr;
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extern void ipfrag_init(void);
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extern void ip_static_sysctl_init(void);
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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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extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
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static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
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{
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if (iph->frag_off & htons(IP_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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iph->id = (sk && inet_sk(sk)->daddr) ?
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htons(inet_sk(sk)->id++) : 0;
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} else
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__ip_select_ident(iph, dst, 0);
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}
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static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
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{
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if (iph->frag_off & htons(IP_DF)) {
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if (sk && inet_sk(sk)->daddr) {
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iph->id = htons(inet_sk(sk)->id);
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inet_sk(sk)->id += 1 + more;
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} else
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iph->id = 0;
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} else
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__ip_select_ident(iph, dst, more);
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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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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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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)->rcv_saddr = inet_sk(sk)->saddr = 0;
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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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(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
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}
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#endif
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}
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#endif
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extern int 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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{
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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_OUT,
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IP_DEFRAG_CONNTRACK_BRIDGE_IN,
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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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};
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int ip_defrag(struct sk_buff *skb, u32 user);
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int ip_frag_mem(struct net *net);
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int ip_frag_nqueues(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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extern 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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extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, __be32 daddr, struct rtable *rt, int is_frag);
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extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
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extern void ip_options_fragment(struct sk_buff *skb);
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extern int ip_options_compile(struct net *net,
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struct ip_options *opt, struct sk_buff *skb);
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extern int ip_options_get(struct net *net, struct ip_options **optp,
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unsigned char *data, int optlen);
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extern int ip_options_get_from_user(struct net *net, struct ip_options **optp,
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unsigned char __user *data, int optlen);
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extern void ip_options_undo(struct ip_options * opt);
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extern void ip_forward_options(struct sk_buff *skb);
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extern 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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extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
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extern int ip_cmsg_send(struct net *net,
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struct msghdr *msg, struct ipcm_cookie *ipc);
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extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);
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extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
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extern int compat_ip_setsockopt(struct sock *sk, int level,
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int optname, char __user *optval, unsigned int optlen);
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extern int compat_ip_getsockopt(struct sock *sk, int level,
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int optname, char __user *optval, int __user *optlen);
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extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
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extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
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extern 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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extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
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u32 info);
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/* sysctl helpers - any sysctl which holds a value that ends up being
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* fed into the routing cache should use these handlers.
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*/
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int ipv4_doint_and_flush(ctl_table *ctl, int write,
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void __user *buffer,
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size_t *lenp, loff_t *ppos);
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int ipv4_doint_and_flush_strategy(ctl_table *table,
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void __user *oldval, size_t __user *oldlenp,
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void __user *newval, size_t newlen);
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#ifdef CONFIG_PROC_FS
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extern int ip_misc_proc_init(void);
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#endif
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#endif /* _IP_H */
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