/* * 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 #include #include #include #ifndef _SNMP_H #include #endif #include /* struct sock */ struct inet_skb_parm { struct ip_options opt; /* Compiled IP options */ unsigned char flags; #define IPSKB_MASQUERADED 1 #define IPSKB_TRANSLATED 2 #define IPSKB_FORWARDED 4 }; struct ipcm_cookie { u32 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 */ extern void ip_mc_dropsocket(struct sock *); extern void ip_mc_dropdevice(struct net_device *dev); extern int ip_mc_procinfo(char *, char **, off_t, int); extern int ip_mcf_procinfo(char *, char **, off_t, int); /* * Functions provided by ip.c */ extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, u32 saddr, u32 daddr, struct ip_options *opt); extern int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt); 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 (*out)(struct sk_buff*)); extern int ip_do_nat(struct sk_buff *skb); extern void ip_send_check(struct iphdr *ip); extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok); extern void ip_init(void); extern int ip_build_xmit(struct sock *sk, int getfrag (const void *, char *, unsigned int, unsigned int, struct sk_buff *), const void *frag, unsigned length, struct ipcm_cookie *ipc, struct rtable *rt, int flags); /* * 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(u32 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 iovec iov[2]; int n_iov; /* redundant */ u32 csum; int csumoffset; /* u16 offset of csum in iov[0].iov_base */ /* -1 if not needed */ }; void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg, unsigned int len); extern int ip_finish_output(struct sk_buff *skb); struct ipv4_config { int log_martians; int autoconfig; int no_pmtu_disc; }; extern struct ipv4_config ipv4_config; extern struct ip_mib ip_statistics[NR_CPUS*2]; #define IP_INC_STATS(field) SNMP_INC_STATS(ip_statistics, field) #define IP_INC_STATS_BH(field) SNMP_INC_STATS_BH(ip_statistics, field) #define IP_INC_STATS_USER(field) SNMP_INC_STATS_USER(ip_statistics, field) extern struct linux_mib net_statistics[NR_CPUS*2]; #define NET_INC_STATS(field) SNMP_INC_STATS(net_statistics, field) #define NET_INC_STATS_BH(field) SNMP_INC_STATS_BH(net_statistics, field) #define NET_INC_STATS_USER(field) SNMP_INC_STATS_USER(net_statistics, field) extern int sysctl_local_port_range[2]; extern int sysctl_ip_default_ttl; #ifdef CONFIG_INET static inline int ip_send(struct sk_buff *skb) { if (skb->len > skb->dst->pmtu) return ip_fragment(skb, ip_finish_output); else return ip_finish_output(skb); } /* 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 = iph->check; check += __constant_htons(0x0100); iph->check = check + (check>=0xFFFF); return --iph->ttl; } static inline int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) { return (sk->protinfo.af_inet.pmtudisc == IP_PMTUDISC_DO || (sk->protinfo.af_inet.pmtudisc == IP_PMTUDISC_WANT && !(dst->mxlock&(1<frag_off&__constant_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 && sk->daddr) ? htons(sk->protinfo.af_inet.id++) : 0); } else __ip_select_ident(iph, dst); } /* * Map a multicast IP onto multicast MAC for type ethernet. */ static inline void ip_eth_mc_map(u32 addr, char *buf) { addr=ntohl(addr); 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; } #endif extern int ip_call_ra_chain(struct sk_buff *skb); /* * Functions provided by ip_fragment.o */ enum ip_defrag_users { IP_DEFRAG_LOCAL_DELIVER, IP_DEFRAG_CALL_RA_CHAIN, IP_DEFRAG_CONNTRACK_IN, IP_DEFRAG_CONNTRACK_OUT, IP_DEFRAG_NAT_OUT, IP_DEFRAG_VS_OUT, IP_DEFRAG_VS_FWD }; struct sk_buff *ip_defrag(struct sk_buff *skb, u32 user); extern int ip_frag_nqueues; extern atomic_t ip_frag_mem; /* * Functions provided by ip_forward.c */ extern int ip_forward(struct sk_buff *skb); extern int ip_net_unreachable(struct sk_buff *skb); /* * Functions provided by ip_options.c */ extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, u32 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 ip_options *opt, struct sk_buff *skb); extern int ip_options_get(struct ip_options **optp, unsigned char *data, int optlen, int user); 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 msghdr *msg, struct ipcm_cookie *ipc); extern int ip_setsockopt(struct sock *sk, int level, int optname, char *optval, int optlen); extern int ip_getsockopt(struct sock *sk, int level, int optname, char *optval, int *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, u16 port, u32 info, u8 *payload); extern void ip_local_error(struct sock *sk, int err, u32 daddr, u16 dport, u32 info); #endif /* _IP_H */