/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Definitions for the IP module. * * Version: @(#)ip.h 1.0.2 05/07/93 * * Authors: Ross Biro * Fred N. van Kempen, * Alan Cox, * * Changes: * Mike McLagan : Routing by source * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _IP_H #define _IP_H #include #include #include #include #include #include struct sock; struct inet_skb_parm { struct ip_options opt; /* Compiled IP options */ unsigned char flags; #define IPSKB_FORWARDED 1 #define IPSKB_XFRM_TUNNEL_SIZE 2 #define IPSKB_XFRM_TRANSFORMED 4 #define IPSKB_FRAG_COMPLETE 8 #define IPSKB_REROUTED 16 }; static inline unsigned int ip_hdrlen(const struct sk_buff *skb) { return ip_hdr(skb)->ihl * 4; } struct ipcm_cookie { __be32 addr; int oif; struct ip_options *opt; }; #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) struct ip_ra_chain { struct ip_ra_chain *next; struct sock *sk; void (*destructor)(struct sock *); }; extern struct ip_ra_chain *ip_ra_chain; extern rwlock_t ip_ra_lock; /* IP flags. */ #define IP_CE 0x8000 /* Flag: "Congestion" */ #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ #define IP_MF 0x2000 /* Flag: "More Fragments" */ #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ struct msghdr; struct net_device; struct packet_type; struct rtable; struct sockaddr; extern int igmp_mc_proc_init(void); /* * Functions provided by ip.c */ extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, __be32 saddr, __be32 daddr, struct ip_options *opt); extern int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); extern int ip_local_deliver(struct sk_buff *skb); extern int ip_mr_input(struct sk_buff *skb); extern int ip_output(struct sk_buff *skb); extern int ip_mc_output(struct sk_buff *skb); extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); extern int ip_do_nat(struct sk_buff *skb); extern void ip_send_check(struct iphdr *ip); extern int __ip_local_out(struct sk_buff *skb); extern int ip_local_out(struct sk_buff *skb); extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok); extern void ip_init(void); extern int ip_append_data(struct sock *sk, int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), void *from, int len, int protolen, struct ipcm_cookie *ipc, struct rtable *rt, unsigned int flags); extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb); extern ssize_t ip_append_page(struct sock *sk, struct page *page, int offset, size_t size, int flags); extern int ip_push_pending_frames(struct sock *sk); extern void ip_flush_pending_frames(struct sock *sk); /* datagram.c */ extern int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); /* * Map a multicast IP onto multicast MAC for type Token Ring. * This conforms to RFC1469 Option 2 Multicasting i.e. * using a functional address to transmit / receive * multicast packets. */ static inline void ip_tr_mc_map(__be32 addr, char *buf) { buf[0]=0xC0; buf[1]=0x00; buf[2]=0x00; buf[3]=0x04; buf[4]=0x00; buf[5]=0x00; } struct ip_reply_arg { struct kvec iov[1]; int flags; __wsum csum; int csumoffset; /* u16 offset of csum in iov[0].iov_base */ /* -1 if not needed */ int bound_dev_if; }; #define IP_REPLY_ARG_NOSRCCHECK 1 void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg, unsigned int len); struct ipv4_config { int log_martians; int no_pmtu_disc; }; extern struct ipv4_config ipv4_config; #define IP_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.ip_statistics, field) #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.ip_statistics, field) #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS_BH((net)->mib.ip_statistics, field, val) #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field) #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field) #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd) #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd) extern unsigned long snmp_fold_field(void *mib[], int offt); extern int snmp_mib_init(void *ptr[2], size_t mibsize); extern void snmp_mib_free(void *ptr[2]); extern void inet_get_local_port_range(int *low, int *high); extern int sysctl_ip_default_ttl; extern int sysctl_ip_nonlocal_bind; extern struct ctl_path net_ipv4_ctl_path[]; /* From inetpeer.c */ extern int inet_peer_threshold; extern int inet_peer_minttl; extern int inet_peer_maxttl; extern int inet_peer_gc_mintime; extern int inet_peer_gc_maxtime; /* From ip_output.c */ extern int sysctl_ip_dynaddr; extern void ipfrag_init(void); extern void ip_static_sysctl_init(void); #ifdef CONFIG_INET #include /* The function in 2.2 was invalid, producing wrong result for * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ static inline int ip_decrease_ttl(struct iphdr *iph) { u32 check = (__force u32)iph->check; check += (__force u32)htons(0x0100); iph->check = (__force __sum16)(check + (check>=0xFFFF)); return --iph->ttl; } static inline int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) { return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && !(dst_metric_locked(dst, RTAX_MTU)))); } extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more); static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk) { if (iph->frag_off & htons(IP_DF)) { /* This is only to work around buggy Windows95/2000 * VJ compression implementations. If the ID field * does not change, they drop every other packet in * a TCP stream using header compression. */ iph->id = (sk && inet_sk(sk)->daddr) ? htons(inet_sk(sk)->id++) : 0; } else __ip_select_ident(iph, dst, 0); } static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more) { if (iph->frag_off & htons(IP_DF)) { if (sk && inet_sk(sk)->daddr) { iph->id = htons(inet_sk(sk)->id); inet_sk(sk)->id += 1 + more; } else iph->id = 0; } else __ip_select_ident(iph, dst, more); } /* * Map a multicast IP onto multicast MAC for type ethernet. */ static inline void ip_eth_mc_map(__be32 naddr, char *buf) { __u32 addr=ntohl(naddr); buf[0]=0x01; buf[1]=0x00; buf[2]=0x5e; buf[5]=addr&0xFF; addr>>=8; buf[4]=addr&0xFF; addr>>=8; buf[3]=addr&0x7F; } /* * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. * Leave P_Key as 0 to be filled in by driver. */ static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) { __u32 addr; unsigned char scope = broadcast[5] & 0xF; buf[0] = 0; /* Reserved */ buf[1] = 0xff; /* Multicast QPN */ buf[2] = 0xff; buf[3] = 0xff; addr = ntohl(naddr); buf[4] = 0xff; buf[5] = 0x10 | scope; /* scope from broadcast address */ buf[6] = 0x40; /* IPv4 signature */ buf[7] = 0x1b; buf[8] = broadcast[8]; /* P_Key */ buf[9] = broadcast[9]; buf[10] = 0; buf[11] = 0; buf[12] = 0; buf[13] = 0; buf[14] = 0; buf[15] = 0; buf[19] = addr & 0xff; addr >>= 8; buf[18] = addr & 0xff; addr >>= 8; buf[17] = addr & 0xff; addr >>= 8; buf[16] = addr & 0x0f; } #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) #include #endif static __inline__ void inet_reset_saddr(struct sock *sk) { inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0; #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) if (sk->sk_family == PF_INET6) { struct ipv6_pinfo *np = inet6_sk(sk); memset(&np->saddr, 0, sizeof(np->saddr)); memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr)); } #endif } #endif extern int ip_call_ra_chain(struct sk_buff *skb); /* * Functions provided by ip_fragment.c */ enum ip_defrag_users { IP_DEFRAG_LOCAL_DELIVER, IP_DEFRAG_CALL_RA_CHAIN, IP_DEFRAG_CONNTRACK_IN, IP_DEFRAG_CONNTRACK_OUT, IP_DEFRAG_VS_IN, IP_DEFRAG_VS_OUT, IP_DEFRAG_VS_FWD }; int ip_defrag(struct sk_buff *skb, u32 user); int ip_frag_mem(struct net *net); int ip_frag_nqueues(struct net *net); /* * Functions provided by ip_forward.c */ extern int ip_forward(struct sk_buff *skb); /* * Functions provided by ip_options.c */ extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, __be32 daddr, struct rtable *rt, int is_frag); extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); extern void ip_options_fragment(struct sk_buff *skb); extern int ip_options_compile(struct net *net, struct ip_options *opt, struct sk_buff *skb); extern int ip_options_get(struct net *net, struct ip_options **optp, unsigned char *data, int optlen); extern int ip_options_get_from_user(struct net *net, struct ip_options **optp, unsigned char __user *data, int optlen); extern void ip_options_undo(struct ip_options * opt); extern void ip_forward_options(struct sk_buff *skb); extern int ip_options_rcv_srr(struct sk_buff *skb); /* * Functions provided by ip_sockglue.c */ extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); extern int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc); extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen); extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); extern int compat_ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen); extern int compat_ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *)); extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len); extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, u32 info, u8 *payload); extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, u32 info); /* sysctl helpers - any sysctl which holds a value that ends up being * fed into the routing cache should use these handlers. */ int ipv4_doint_and_flush(ctl_table *ctl, int write, struct file* filp, void __user *buffer, size_t *lenp, loff_t *ppos); int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, void __user *newval, size_t newlen); #ifdef CONFIG_PROC_FS extern int ip_misc_proc_init(void); #endif #endif /* _IP_H */