Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * Definitions for the IP module. |
| 7 | * |
| 8 | * Version: @(#)ip.h 1.0.2 05/07/93 |
| 9 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 10 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 12 | * Alan Cox, <gw4pts@gw4pts.ampr.org> |
| 13 | * |
| 14 | * Changes: |
| 15 | * Mike McLagan : Routing by source |
| 16 | * |
| 17 | * This program is free software; you can redistribute it and/or |
| 18 | * modify it under the terms of the GNU General Public License |
| 19 | * as published by the Free Software Foundation; either version |
| 20 | * 2 of the License, or (at your option) any later version. |
| 21 | */ |
| 22 | #ifndef _IP_H |
| 23 | #define _IP_H |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/ip.h> |
| 27 | #include <linux/in.h> |
Arnaldo Carvalho de Melo | c9bdd4b | 2007-03-12 20:09:15 -0300 | [diff] [blame] | 28 | #include <linux/skbuff.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 29 | |
| 30 | #include <net/inet_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <net/snmp.h> |
KOVACS Krisztian | 86b08d8 | 2008-10-01 07:44:42 -0700 | [diff] [blame] | 32 | #include <net/flow.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | struct sock; |
| 35 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 36 | struct inet_skb_parm { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | struct ip_options opt; /* Compiled IP options */ |
| 38 | unsigned char flags; |
| 39 | |
Patrick McHardy | 8cdfab8 | 2006-01-06 23:04:01 -0800 | [diff] [blame] | 40 | #define IPSKB_FORWARDED 1 |
| 41 | #define IPSKB_XFRM_TUNNEL_SIZE 2 |
Patrick McHardy | 3e3850e | 2006-01-06 23:04:54 -0800 | [diff] [blame] | 42 | #define IPSKB_XFRM_TRANSFORMED 4 |
| 43 | #define IPSKB_FRAG_COMPLETE 8 |
Patrick McHardy | 48d5cad | 2006-02-15 15:10:22 -0800 | [diff] [blame] | 44 | #define IPSKB_REROUTED 16 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | }; |
| 46 | |
Arnaldo Carvalho de Melo | c9bdd4b | 2007-03-12 20:09:15 -0300 | [diff] [blame] | 47 | static inline unsigned int ip_hdrlen(const struct sk_buff *skb) |
| 48 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 49 | return ip_hdr(skb)->ihl * 4; |
Arnaldo Carvalho de Melo | c9bdd4b | 2007-03-12 20:09:15 -0300 | [diff] [blame] | 50 | } |
| 51 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 52 | struct ipcm_cookie { |
Al Viro | c1d18f9 | 2006-09-27 18:28:28 -0700 | [diff] [blame] | 53 | __be32 addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | int oif; |
| 55 | struct ip_options *opt; |
Patrick Ohly | 51f31ca | 2009-02-12 05:03:39 +0000 | [diff] [blame] | 56 | union skb_shared_tx shtx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | }; |
| 58 | |
| 59 | #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) |
| 60 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 61 | struct ip_ra_chain { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | struct ip_ra_chain *next; |
| 63 | struct sock *sk; |
Eric Dumazet | 592fcb9 | 2010-06-09 16:21:07 +0000 | [diff] [blame] | 64 | union { |
| 65 | void (*destructor)(struct sock *); |
| 66 | struct sock *saved_sk; |
| 67 | }; |
Eric Dumazet | 6601850 | 2010-06-07 03:12:08 +0000 | [diff] [blame] | 68 | struct rcu_head rcu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | }; |
| 70 | |
| 71 | extern struct ip_ra_chain *ip_ra_chain; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
| 73 | /* IP flags. */ |
| 74 | #define IP_CE 0x8000 /* Flag: "Congestion" */ |
| 75 | #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ |
| 76 | #define IP_MF 0x2000 /* Flag: "More Fragments" */ |
| 77 | #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ |
| 78 | |
| 79 | #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ |
| 80 | |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 81 | struct msghdr; |
| 82 | struct net_device; |
| 83 | struct packet_type; |
| 84 | struct rtable; |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 85 | struct sockaddr; |
| 86 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | extern int igmp_mc_proc_init(void); |
| 88 | |
| 89 | /* |
| 90 | * Functions provided by ip.c |
| 91 | */ |
| 92 | |
| 93 | extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, |
Al Viro | 13d8eaa0 | 2006-09-26 22:27:30 -0700 | [diff] [blame] | 94 | __be32 saddr, __be32 daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | struct ip_options *opt); |
| 96 | extern int ip_rcv(struct sk_buff *skb, struct net_device *dev, |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 97 | struct packet_type *pt, struct net_device *orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | extern int ip_local_deliver(struct sk_buff *skb); |
| 99 | extern int ip_mr_input(struct sk_buff *skb); |
| 100 | extern int ip_output(struct sk_buff *skb); |
| 101 | extern int ip_mc_output(struct sk_buff *skb); |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 102 | extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | extern int ip_do_nat(struct sk_buff *skb); |
| 104 | extern void ip_send_check(struct iphdr *ip); |
Herbert Xu | c439cb2 | 2008-01-11 19:14:00 -0800 | [diff] [blame] | 105 | extern int __ip_local_out(struct sk_buff *skb); |
| 106 | extern int ip_local_out(struct sk_buff *skb); |
Shan Wei | 4e15ed4 | 2010-04-15 16:43:08 +0000 | [diff] [blame] | 107 | extern int ip_queue_xmit(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | extern void ip_init(void); |
| 109 | extern int ip_append_data(struct sock *sk, |
| 110 | int getfrag(void *from, char *to, int offset, int len, |
| 111 | int odd, struct sk_buff *skb), |
| 112 | void *from, int len, int protolen, |
| 113 | struct ipcm_cookie *ipc, |
Eric Dumazet | 2e77d89 | 2008-11-24 15:52:46 -0800 | [diff] [blame] | 114 | struct rtable **rt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | unsigned int flags); |
| 116 | extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb); |
| 117 | extern ssize_t ip_append_page(struct sock *sk, struct page *page, |
| 118 | int offset, size_t size, int flags); |
| 119 | extern int ip_push_pending_frames(struct sock *sk); |
| 120 | extern void ip_flush_pending_frames(struct sock *sk); |
| 121 | |
| 122 | /* datagram.c */ |
| 123 | extern int ip4_datagram_connect(struct sock *sk, |
| 124 | struct sockaddr *uaddr, int addr_len); |
| 125 | |
| 126 | /* |
| 127 | * Map a multicast IP onto multicast MAC for type Token Ring. |
| 128 | * This conforms to RFC1469 Option 2 Multicasting i.e. |
| 129 | * using a functional address to transmit / receive |
| 130 | * multicast packets. |
| 131 | */ |
| 132 | |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 133 | static inline void ip_tr_mc_map(__be32 addr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | { |
| 135 | buf[0]=0xC0; |
| 136 | buf[1]=0x00; |
| 137 | buf[2]=0x00; |
| 138 | buf[3]=0x04; |
| 139 | buf[4]=0x00; |
| 140 | buf[5]=0x00; |
| 141 | } |
| 142 | |
| 143 | struct ip_reply_arg { |
| 144 | struct kvec iov[1]; |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 145 | int flags; |
Al Viro | d6f5493c | 2006-11-14 21:26:08 -0800 | [diff] [blame] | 146 | __wsum csum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | int csumoffset; /* u16 offset of csum in iov[0].iov_base */ |
| 148 | /* -1 if not needed */ |
Patrick McHardy | f0e48db | 2007-06-04 21:32:46 -0700 | [diff] [blame] | 149 | int bound_dev_if; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | }; |
| 151 | |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 152 | #define IP_REPLY_ARG_NOSRCCHECK 1 |
| 153 | |
KOVACS Krisztian | 86b08d8 | 2008-10-01 07:44:42 -0700 | [diff] [blame] | 154 | static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) |
| 155 | { |
| 156 | return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; |
| 157 | } |
| 158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg, |
| 160 | unsigned int len); |
| 161 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 162 | struct ipv4_config { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | int log_martians; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | int no_pmtu_disc; |
| 165 | }; |
| 166 | |
| 167 | extern struct ipv4_config ipv4_config; |
Eric Dumazet | 4ce3c18 | 2010-06-30 13:31:19 -0700 | [diff] [blame^] | 168 | #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
| 169 | #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field) |
| 170 | #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) |
| 171 | #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val) |
| 172 | #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) |
| 173 | #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val) |
Pavel Emelyanov | 61a7e26 | 2008-07-18 04:03:08 -0700 | [diff] [blame] | 174 | #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) |
| 175 | #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field) |
| 176 | #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field) |
| 177 | #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd) |
| 178 | #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
Tejun Heo | 7d720c3 | 2010-02-16 15:20:26 +0000 | [diff] [blame] | 180 | extern unsigned long snmp_fold_field(void __percpu *mib[], int offt); |
Eric Dumazet | 4ce3c18 | 2010-06-30 13:31:19 -0700 | [diff] [blame^] | 181 | #if BITS_PER_LONG==32 |
| 182 | extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off); |
| 183 | #else |
| 184 | static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off) |
| 185 | { |
| 186 | return snmp_fold_field(mib, offt); |
| 187 | } |
| 188 | #endif |
Eric Dumazet | 1823e4c8 | 2010-06-22 20:58:41 +0000 | [diff] [blame] | 189 | extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align); |
Tejun Heo | 7d720c3 | 2010-02-16 15:20:26 +0000 | [diff] [blame] | 190 | extern void snmp_mib_free(void __percpu *ptr[2]); |
YOSHIFUJI Hideaki | 3349017 | 2007-04-20 15:57:15 -0700 | [diff] [blame] | 191 | |
Eric Dumazet | 3c689b7 | 2008-10-08 14:18:04 -0700 | [diff] [blame] | 192 | extern struct local_ports { |
| 193 | seqlock_t lock; |
| 194 | int range[2]; |
| 195 | } sysctl_local_ports; |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 196 | extern void inet_get_local_port_range(int *low, int *high); |
| 197 | |
Amerigo Wang | e3826f1 | 2010-05-05 00:27:06 +0000 | [diff] [blame] | 198 | extern unsigned long *sysctl_local_reserved_ports; |
| 199 | static inline int inet_is_reserved_local_port(int port) |
| 200 | { |
| 201 | return test_bit(port, sysctl_local_reserved_ports); |
| 202 | } |
| 203 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | extern int sysctl_ip_default_ttl; |
Neil Horman | cdac4e0 | 2005-06-13 15:12:33 -0700 | [diff] [blame] | 205 | extern int sysctl_ip_nonlocal_bind; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
Alexey Dobriyan | b27aead | 2008-11-25 18:00:48 -0800 | [diff] [blame] | 207 | extern struct ctl_path net_core_path[]; |
Pavel Emelyanov | 3d7cc2b | 2008-01-09 00:33:11 -0800 | [diff] [blame] | 208 | extern struct ctl_path net_ipv4_ctl_path[]; |
| 209 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 210 | /* From inetpeer.c */ |
| 211 | extern int inet_peer_threshold; |
| 212 | extern int inet_peer_minttl; |
| 213 | extern int inet_peer_maxttl; |
| 214 | extern int inet_peer_gc_mintime; |
| 215 | extern int inet_peer_gc_maxtime; |
| 216 | |
| 217 | /* From ip_output.c */ |
| 218 | extern int sysctl_ip_dynaddr; |
| 219 | |
| 220 | extern void ipfrag_init(void); |
| 221 | |
Al Viro | bd7b153 | 2008-07-15 16:00:59 -0400 | [diff] [blame] | 222 | extern void ip_static_sysctl_init(void); |
| 223 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | #ifdef CONFIG_INET |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 225 | #include <net/dst.h> |
| 226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | /* The function in 2.2 was invalid, producing wrong result for |
| 228 | * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ |
| 229 | static inline |
| 230 | int ip_decrease_ttl(struct iphdr *iph) |
| 231 | { |
Al Viro | 5c78f27 | 2006-11-14 21:42:26 -0800 | [diff] [blame] | 232 | u32 check = (__force u32)iph->check; |
| 233 | check += (__force u32)htons(0x0100); |
| 234 | iph->check = (__force __sum16)(check + (check>=0xFFFF)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | return --iph->ttl; |
| 236 | } |
| 237 | |
| 238 | static inline |
| 239 | int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) |
| 240 | { |
| 241 | return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || |
| 242 | (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && |
Satoru SATOH | 0bbeafd | 2008-05-04 22:12:43 -0700 | [diff] [blame] | 243 | !(dst_metric_locked(dst, RTAX_MTU)))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | } |
| 245 | |
| 246 | extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more); |
| 247 | |
| 248 | static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk) |
| 249 | { |
| 250 | if (iph->frag_off & htons(IP_DF)) { |
| 251 | /* This is only to work around buggy Windows95/2000 |
| 252 | * VJ compression implementations. If the ID field |
| 253 | * does not change, they drop every other packet in |
| 254 | * a TCP stream using header compression. |
| 255 | */ |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 256 | iph->id = (sk && inet_sk(sk)->inet_daddr) ? |
| 257 | htons(inet_sk(sk)->inet_id++) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | } else |
| 259 | __ip_select_ident(iph, dst, 0); |
| 260 | } |
| 261 | |
| 262 | static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more) |
| 263 | { |
| 264 | if (iph->frag_off & htons(IP_DF)) { |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 265 | if (sk && inet_sk(sk)->inet_daddr) { |
| 266 | iph->id = htons(inet_sk(sk)->inet_id); |
| 267 | inet_sk(sk)->inet_id += 1 + more; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | } else |
| 269 | iph->id = 0; |
| 270 | } else |
| 271 | __ip_select_ident(iph, dst, more); |
| 272 | } |
| 273 | |
| 274 | /* |
| 275 | * Map a multicast IP onto multicast MAC for type ethernet. |
| 276 | */ |
| 277 | |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 278 | static inline void ip_eth_mc_map(__be32 naddr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | { |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 280 | __u32 addr=ntohl(naddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | buf[0]=0x01; |
| 282 | buf[1]=0x00; |
| 283 | buf[2]=0x5e; |
| 284 | buf[5]=addr&0xFF; |
| 285 | addr>>=8; |
| 286 | buf[4]=addr&0xFF; |
| 287 | addr>>=8; |
| 288 | buf[3]=addr&0x7F; |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. |
| 293 | * Leave P_Key as 0 to be filled in by driver. |
| 294 | */ |
| 295 | |
Rolf Manderscheid | a9e527e | 2007-12-10 13:38:41 -0700 | [diff] [blame] | 296 | static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | { |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 298 | __u32 addr; |
Rolf Manderscheid | a9e527e | 2007-12-10 13:38:41 -0700 | [diff] [blame] | 299 | unsigned char scope = broadcast[5] & 0xF; |
| 300 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | buf[0] = 0; /* Reserved */ |
| 302 | buf[1] = 0xff; /* Multicast QPN */ |
| 303 | buf[2] = 0xff; |
| 304 | buf[3] = 0xff; |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 305 | addr = ntohl(naddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | buf[4] = 0xff; |
Rolf Manderscheid | a9e527e | 2007-12-10 13:38:41 -0700 | [diff] [blame] | 307 | buf[5] = 0x10 | scope; /* scope from broadcast address */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | buf[6] = 0x40; /* IPv4 signature */ |
| 309 | buf[7] = 0x1b; |
Rolf Manderscheid | a9e527e | 2007-12-10 13:38:41 -0700 | [diff] [blame] | 310 | buf[8] = broadcast[8]; /* P_Key */ |
| 311 | buf[9] = broadcast[9]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | buf[10] = 0; |
| 313 | buf[11] = 0; |
| 314 | buf[12] = 0; |
| 315 | buf[13] = 0; |
| 316 | buf[14] = 0; |
| 317 | buf[15] = 0; |
| 318 | buf[19] = addr & 0xff; |
| 319 | addr >>= 8; |
| 320 | buf[18] = addr & 0xff; |
| 321 | addr >>= 8; |
| 322 | buf[17] = addr & 0xff; |
| 323 | addr >>= 8; |
| 324 | buf[16] = addr & 0x0f; |
| 325 | } |
| 326 | |
| 327 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 328 | #include <linux/ipv6.h> |
| 329 | #endif |
| 330 | |
| 331 | static __inline__ void inet_reset_saddr(struct sock *sk) |
| 332 | { |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 333 | inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 335 | if (sk->sk_family == PF_INET6) { |
| 336 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 337 | |
| 338 | memset(&np->saddr, 0, sizeof(np->saddr)); |
| 339 | memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr)); |
| 340 | } |
| 341 | #endif |
| 342 | } |
| 343 | |
| 344 | #endif |
| 345 | |
Octavian Purdila | 7ad6848 | 2010-01-06 20:37:01 -0800 | [diff] [blame] | 346 | static inline int sk_mc_loop(struct sock *sk) |
| 347 | { |
| 348 | if (!sk) |
| 349 | return 1; |
| 350 | switch (sk->sk_family) { |
| 351 | case AF_INET: |
| 352 | return inet_sk(sk)->mc_loop; |
| 353 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 354 | case AF_INET6: |
| 355 | return inet6_sk(sk)->mc_loop; |
| 356 | #endif |
| 357 | } |
Octavian Purdila | cd65c3c | 2010-01-13 18:10:36 -0800 | [diff] [blame] | 358 | WARN_ON(1); |
Octavian Purdila | 7ad6848 | 2010-01-06 20:37:01 -0800 | [diff] [blame] | 359 | return 1; |
| 360 | } |
| 361 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | extern int ip_call_ra_chain(struct sk_buff *skb); |
| 363 | |
| 364 | /* |
Rami Rosen | b798232 | 2008-01-01 21:13:09 -0800 | [diff] [blame] | 365 | * Functions provided by ip_fragment.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | */ |
| 367 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 368 | enum ip_defrag_users { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | IP_DEFRAG_LOCAL_DELIVER, |
| 370 | IP_DEFRAG_CALL_RA_CHAIN, |
| 371 | IP_DEFRAG_CONNTRACK_IN, |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 372 | __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | IP_DEFRAG_CONNTRACK_OUT, |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 374 | __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
Patrick McHardy | 8fa9ff6 | 2009-12-15 16:59:59 +0100 | [diff] [blame] | 375 | IP_DEFRAG_CONNTRACK_BRIDGE_IN, |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 376 | __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | IP_DEFRAG_VS_IN, |
| 378 | IP_DEFRAG_VS_OUT, |
| 379 | IP_DEFRAG_VS_FWD |
| 380 | }; |
| 381 | |
Herbert Xu | 776c729 | 2007-10-14 00:38:32 -0700 | [diff] [blame] | 382 | int ip_defrag(struct sk_buff *skb, u32 user); |
Pavel Emelyanov | 6ddc082 | 2008-01-22 06:07:25 -0800 | [diff] [blame] | 383 | int ip_frag_mem(struct net *net); |
Pavel Emelyanov | e5a2bb8 | 2008-01-22 06:06:23 -0800 | [diff] [blame] | 384 | int ip_frag_nqueues(struct net *net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
| 386 | /* |
| 387 | * Functions provided by ip_forward.c |
| 388 | */ |
| 389 | |
| 390 | extern int ip_forward(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
| 392 | /* |
| 393 | * Functions provided by ip_options.c |
| 394 | */ |
| 395 | |
Al Viro | 8712f77 | 2006-09-26 22:27:05 -0700 | [diff] [blame] | 396 | extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, __be32 daddr, struct rtable *rt, int is_frag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); |
| 398 | extern void ip_options_fragment(struct sk_buff *skb); |
Denis V. Lunev | 0e6bd4a | 2008-03-24 15:29:23 -0700 | [diff] [blame] | 399 | extern int ip_options_compile(struct net *net, |
| 400 | struct ip_options *opt, struct sk_buff *skb); |
Denis V. Lunev | f2c4802 | 2008-03-24 15:29:55 -0700 | [diff] [blame] | 401 | extern int ip_options_get(struct net *net, struct ip_options **optp, |
Arnaldo Carvalho de Melo | 4c6ea29 | 2005-08-16 19:46:48 -0300 | [diff] [blame] | 402 | unsigned char *data, int optlen); |
Denis V. Lunev | f2c4802 | 2008-03-24 15:29:55 -0700 | [diff] [blame] | 403 | extern int ip_options_get_from_user(struct net *net, struct ip_options **optp, |
Arnaldo Carvalho de Melo | 4c6ea29 | 2005-08-16 19:46:48 -0300 | [diff] [blame] | 404 | unsigned char __user *data, int optlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | extern void ip_options_undo(struct ip_options * opt); |
| 406 | extern void ip_forward_options(struct sk_buff *skb); |
| 407 | extern int ip_options_rcv_srr(struct sk_buff *skb); |
| 408 | |
| 409 | /* |
| 410 | * Functions provided by ip_sockglue.c |
| 411 | */ |
| 412 | |
Eric Dumazet | f84af32 | 2010-04-28 15:31:51 -0700 | [diff] [blame] | 413 | extern int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); |
Denis V. Lunev | 7a6adb9 | 2008-03-24 15:30:27 -0700 | [diff] [blame] | 415 | extern int ip_cmsg_send(struct net *net, |
| 416 | struct msghdr *msg, struct ipcm_cookie *ipc); |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 417 | extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 419 | extern int compat_ip_setsockopt(struct sock *sk, int level, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 420 | int optname, char __user *optval, unsigned int optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 421 | extern int compat_ip_getsockopt(struct sock *sk, int level, |
| 422 | int optname, char __user *optval, int __user *optlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *)); |
| 424 | |
| 425 | extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len); |
| 426 | extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
Al Viro | 35986b3 | 2006-09-27 18:34:21 -0700 | [diff] [blame] | 427 | __be16 port, u32 info, u8 *payload); |
Al Viro | 0579016 | 2006-09-27 18:33:40 -0700 | [diff] [blame] | 428 | extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | u32 info); |
| 430 | |
| 431 | /* sysctl helpers - any sysctl which holds a value that ends up being |
| 432 | * fed into the routing cache should use these handlers. |
| 433 | */ |
| 434 | int ipv4_doint_and_flush(ctl_table *ctl, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 435 | void __user *buffer, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | size_t *lenp, loff_t *ppos); |
Alexey Dobriyan | f221e72 | 2008-10-15 22:04:23 -0700 | [diff] [blame] | 437 | int ipv4_doint_and_flush_strategy(ctl_table *table, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | void __user *oldval, size_t __user *oldlenp, |
Alexey Dobriyan | 1f29bcd | 2006-12-10 02:19:10 -0800 | [diff] [blame] | 439 | void __user *newval, size_t newlen); |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 440 | #ifdef CONFIG_PROC_FS |
| 441 | extern int ip_misc_proc_init(void); |
| 442 | #endif |
| 443 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | #endif /* _IP_H */ |