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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 | /* * 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, <bir7@leland.Stanford.Edu> * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * Alan Cox, <gw4pts@gw4pts.ampr.org> * * 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 <linux/config.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/ip.h> #include <linux/netdevice.h> #include <net/route.h> #ifndef _SNMP_H #include <net/snmp.h> #endif #include <net/sock.h> /* struct sock */ struct inet_skb_parm { struct ip_options opt; /* Compiled IP options */ u16 redirport; /* Redirect port */ unsigned char flags; char vif; #define IPSKB_MASQUERADED 1 #define IPSKB_TRANSLATED 2 #define IPSKB_TUNNELED 4 }; struct ipcm_cookie { u32 addr; struct ip_options *opt; }; #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) /* 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 device *dev); extern int ip_mc_procinfo(char *, char **, off_t, int, int); /* * Functions provided by ip.c */ extern int ip_ioctl(struct sock *sk, int cmd, unsigned long arg); extern int ip_build_pkt(struct sk_buff *skb, struct sock *sk, u32 saddr, u32 daddr, struct ip_options *opt); extern int ip_build_header(struct sk_buff *skb, struct sock *sk); extern int ip_rcv(struct sk_buff *skb, struct 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); #ifdef CONFIG_IP_ACCT extern int ip_acct_output(struct sk_buff *skb); #else #define ip_acct_output dev_queue_xmit #endif extern void ip_fragment(struct sk_buff *skb, int, int (*out)(struct sk_buff*)); extern struct sk_buff * ip_reply(struct sk_buff *skb, int payload); extern int ip_do_nat(struct sk_buff *skb); extern void ip_send_check(struct iphdr *ip); extern int ip_id_count; extern void ip_queue_xmit(struct sk_buff *skb); extern void ip_init(void); extern int ip_build_xmit(struct sock *sk, int getfrag (const void *, char *, unsigned int, unsigned int), const void *frag, unsigned short int length, struct ipcm_cookie *ipc, struct rtable *rt, int flags); static __inline__ void ip_send(struct sk_buff *skb) { ip_ll_header(skb); if (skb->len > skb->dev->mtu + skb->dev->hard_header_len) ip_fragment(skb, 0, ip_acct_output); else ip_acct_output(skb); } static __inline__ int ip_decrease_ttl(struct iphdr *iph) { u16 check = iph->check; check = ntohs(check) + 0x0100; if ((check & 0xFF00) == 0) check++; /* carry overflow */ iph->check = htons(check); return --iph->ttl; } extern struct ip_mib ip_statistics; struct ipv4_config { int accept_redirects; int secure_redirects; int rfc1620_redirects; int rfc1812_filter; int addrmask_agent; int log_martians; int source_route; int multicast_route; int bootp_agent; int bootp_relay; int fib_model; int no_pmtu_disc; }; extern struct ipv4_config ipv4_config; #define IS_ROUTER (ip_statistics.IpForwarding == 1) /* * Functions provided by ip_fragment.o */ struct sk_buff *ip_defrag(struct sk_buff *skb); /* * 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, u32 saddr, 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, struct device **devp); 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 ipv4_backlog_rcv(struct sock *sk, struct sk_buff *skb); #endif /* _IP_H */ |