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> |
Francesco Fusco | aa66158 | 2013-09-24 15:43:09 +0200 | [diff] [blame] | 31 | #include <net/route.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <net/snmp.h> |
KOVACS Krisztian | 86b08d8 | 2008-10-01 07:44:42 -0700 | [diff] [blame] | 33 | #include <net/flow.h> |
Tom Herbert | b73c3d0 | 2014-07-01 21:32:17 -0700 | [diff] [blame] | 34 | #include <net/flow_keys.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | struct sock; |
| 37 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 38 | struct inet_skb_parm { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | struct ip_options opt; /* Compiled IP options */ |
| 40 | unsigned char flags; |
| 41 | |
Patrick McHardy | 8cdfab8 | 2006-01-06 23:04:01 -0800 | [diff] [blame] | 42 | #define IPSKB_FORWARDED 1 |
| 43 | #define IPSKB_XFRM_TUNNEL_SIZE 2 |
Patrick McHardy | 3e3850e | 2006-01-06 23:04:54 -0800 | [diff] [blame] | 44 | #define IPSKB_XFRM_TRANSFORMED 4 |
| 45 | #define IPSKB_FRAG_COMPLETE 8 |
Patrick McHardy | 48d5cad | 2006-02-15 15:10:22 -0800 | [diff] [blame] | 46 | #define IPSKB_REROUTED 16 |
Patrick McHardy | 5f2d04f | 2012-08-26 19:13:55 +0200 | [diff] [blame] | 47 | |
| 48 | u16 frag_max_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | }; |
| 50 | |
Arnaldo Carvalho de Melo | c9bdd4b | 2007-03-12 20:09:15 -0300 | [diff] [blame] | 51 | static inline unsigned int ip_hdrlen(const struct sk_buff *skb) |
| 52 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 53 | return ip_hdr(skb)->ihl * 4; |
Arnaldo Carvalho de Melo | c9bdd4b | 2007-03-12 20:09:15 -0300 | [diff] [blame] | 54 | } |
| 55 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 56 | struct ipcm_cookie { |
Al Viro | c1d18f9 | 2006-09-27 18:28:28 -0700 | [diff] [blame] | 57 | __be32 addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | int oif; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 59 | struct ip_options_rcu *opt; |
Oliver Hartkopp | 2244d07 | 2010-08-17 08:59:14 +0000 | [diff] [blame] | 60 | __u8 tx_flags; |
Francesco Fusco | f02db31 | 2013-09-24 15:43:08 +0200 | [diff] [blame] | 61 | __u8 ttl; |
| 62 | __s16 tos; |
| 63 | char priority; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | }; |
| 65 | |
| 66 | #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) |
Hannes Frederic Sowa | 4b261c7 | 2014-01-20 03:43:08 +0100 | [diff] [blame] | 67 | #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 69 | struct ip_ra_chain { |
Eric Dumazet | 43a951e | 2010-10-25 03:32:44 +0000 | [diff] [blame] | 70 | struct ip_ra_chain __rcu *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | struct sock *sk; |
Eric Dumazet | 592fcb9 | 2010-06-09 16:21:07 +0000 | [diff] [blame] | 72 | union { |
| 73 | void (*destructor)(struct sock *); |
| 74 | struct sock *saved_sk; |
| 75 | }; |
Eric Dumazet | 6601850 | 2010-06-07 03:12:08 +0000 | [diff] [blame] | 76 | struct rcu_head rcu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | }; |
| 78 | |
Eric Dumazet | 43a951e | 2010-10-25 03:32:44 +0000 | [diff] [blame] | 79 | extern struct ip_ra_chain __rcu *ip_ra_chain; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
| 81 | /* IP flags. */ |
| 82 | #define IP_CE 0x8000 /* Flag: "Congestion" */ |
| 83 | #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ |
| 84 | #define IP_MF 0x2000 /* Flag: "More Fragments" */ |
| 85 | #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ |
| 86 | |
| 87 | #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ |
| 88 | |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 89 | struct msghdr; |
| 90 | struct net_device; |
| 91 | struct packet_type; |
| 92 | struct rtable; |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 93 | struct sockaddr; |
| 94 | |
WANG Cong | 72c1d3b | 2014-01-10 16:09:45 -0800 | [diff] [blame] | 95 | int igmp_mc_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
| 97 | /* |
| 98 | * Functions provided by ip.c |
| 99 | */ |
| 100 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 101 | int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, |
| 102 | __be32 saddr, __be32 daddr, |
| 103 | struct ip_options_rcu *opt); |
| 104 | int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, |
| 105 | struct net_device *orig_dev); |
| 106 | int ip_local_deliver(struct sk_buff *skb); |
| 107 | int ip_mr_input(struct sk_buff *skb); |
Eric Dumazet | aad8872 | 2014-04-15 13:47:15 -0400 | [diff] [blame] | 108 | int ip_output(struct sock *sk, struct sk_buff *skb); |
| 109 | int ip_mc_output(struct sock *sk, struct sk_buff *skb); |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 110 | int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); |
| 111 | int ip_do_nat(struct sk_buff *skb); |
| 112 | void ip_send_check(struct iphdr *ip); |
| 113 | int __ip_local_out(struct sk_buff *skb); |
Eric Dumazet | aad8872 | 2014-04-15 13:47:15 -0400 | [diff] [blame] | 114 | int ip_local_out_sk(struct sock *sk, struct sk_buff *skb); |
| 115 | static inline int ip_local_out(struct sk_buff *skb) |
| 116 | { |
| 117 | return ip_local_out_sk(skb->sk, skb); |
| 118 | } |
| 119 | |
Eric Dumazet | b0270e9 | 2014-04-15 12:58:34 -0400 | [diff] [blame] | 120 | int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl); |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 121 | void ip_init(void); |
| 122 | int ip_append_data(struct sock *sk, struct flowi4 *fl4, |
| 123 | int getfrag(void *from, char *to, int offset, int len, |
| 124 | int odd, struct sk_buff *skb), |
| 125 | void *from, int len, int protolen, |
| 126 | struct ipcm_cookie *ipc, |
| 127 | struct rtable **rt, |
| 128 | unsigned int flags); |
| 129 | int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, |
| 130 | struct sk_buff *skb); |
| 131 | ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, |
| 132 | int offset, size_t size, int flags); |
| 133 | struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, |
| 134 | struct sk_buff_head *queue, |
| 135 | struct inet_cork *cork); |
| 136 | int ip_send_skb(struct net *net, struct sk_buff *skb); |
| 137 | int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); |
| 138 | void ip_flush_pending_frames(struct sock *sk); |
| 139 | struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, |
| 140 | int getfrag(void *from, char *to, int offset, |
| 141 | int len, int odd, struct sk_buff *skb), |
| 142 | void *from, int length, int transhdrlen, |
| 143 | struct ipcm_cookie *ipc, struct rtable **rtp, |
| 144 | unsigned int flags); |
Herbert Xu | 1c32c5a | 2011-03-01 02:36:47 +0000 | [diff] [blame] | 145 | |
David S. Miller | 77968b7 | 2011-05-08 17:12:19 -0700 | [diff] [blame] | 146 | static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) |
Herbert Xu | 1c32c5a | 2011-03-01 02:36:47 +0000 | [diff] [blame] | 147 | { |
David S. Miller | 77968b7 | 2011-05-08 17:12:19 -0700 | [diff] [blame] | 148 | return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); |
Herbert Xu | 1c32c5a | 2011-03-01 02:36:47 +0000 | [diff] [blame] | 149 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
Francesco Fusco | aa66158 | 2013-09-24 15:43:09 +0200 | [diff] [blame] | 151 | static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) |
| 152 | { |
| 153 | return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); |
| 154 | } |
| 155 | |
| 156 | static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) |
| 157 | { |
| 158 | return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); |
| 159 | } |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | /* datagram.c */ |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 162 | int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 164 | void ip4_datagram_release_cb(struct sock *sk); |
Steffen Klassert | 8141ed9 | 2013-01-21 02:00:03 +0000 | [diff] [blame] | 165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | struct ip_reply_arg { |
| 167 | struct kvec iov[1]; |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 168 | int flags; |
Al Viro | d6f5493c | 2006-11-14 21:26:08 -0800 | [diff] [blame] | 169 | __wsum csum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | int csumoffset; /* u16 offset of csum in iov[0].iov_base */ |
| 171 | /* -1 if not needed */ |
Patrick McHardy | f0e48db | 2007-06-04 21:32:46 -0700 | [diff] [blame] | 172 | int bound_dev_if; |
Eric Dumazet | 66b13d9 | 2011-10-24 03:06:21 -0400 | [diff] [blame] | 173 | u8 tos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | }; |
| 175 | |
KOVACS Krisztian | 88ef4a5 | 2008-10-01 07:41:00 -0700 | [diff] [blame] | 176 | #define IP_REPLY_ARG_NOSRCCHECK 1 |
| 177 | |
KOVACS Krisztian | 86b08d8 | 2008-10-01 07:44:42 -0700 | [diff] [blame] | 178 | static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) |
| 179 | { |
| 180 | return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; |
| 181 | } |
| 182 | |
Eric Dumazet | be9f4a4 | 2012-07-19 07:34:03 +0000 | [diff] [blame] | 183 | void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, |
David S. Miller | 70e7341 | 2012-06-28 03:21:41 -0700 | [diff] [blame] | 184 | __be32 saddr, const struct ip_reply_arg *arg, |
| 185 | unsigned int len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | |
Eric Dumazet | 4ce3c18 | 2010-06-30 13:31:19 -0700 | [diff] [blame] | 187 | #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) |
| 188 | #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field) |
| 189 | #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) |
| 190 | #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val) |
| 191 | #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) |
| 192 | #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] | 193 | #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) |
| 194 | #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field) |
| 195 | #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field) |
David S. Miller | f7324ac | 2014-03-06 15:03:17 -0500 | [diff] [blame] | 196 | #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) |
Pavel Emelyanov | 61a7e26 | 2008-07-18 04:03:08 -0700 | [diff] [blame] | 197 | #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd) |
| 198 | #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] | 199 | |
WANG Cong | 698365f | 2014-05-05 15:55:55 -0700 | [diff] [blame] | 200 | unsigned long snmp_fold_field(void __percpu *mib, int offt); |
Eric Dumazet | 4ce3c18 | 2010-06-30 13:31:19 -0700 | [diff] [blame] | 201 | #if BITS_PER_LONG==32 |
WANG Cong | 698365f | 2014-05-05 15:55:55 -0700 | [diff] [blame] | 202 | u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off); |
Eric Dumazet | 4ce3c18 | 2010-06-30 13:31:19 -0700 | [diff] [blame] | 203 | #else |
WANG Cong | 698365f | 2014-05-05 15:55:55 -0700 | [diff] [blame] | 204 | static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off) |
Eric Dumazet | 4ce3c18 | 2010-06-30 13:31:19 -0700 | [diff] [blame] | 205 | { |
| 206 | return snmp_fold_field(mib, offt); |
| 207 | } |
| 208 | #endif |
YOSHIFUJI Hideaki | 3349017 | 2007-04-20 15:57:15 -0700 | [diff] [blame] | 209 | |
Eric W. Biederman | 0bbf87d | 2013-09-28 14:10:59 -0700 | [diff] [blame] | 210 | void inet_get_local_port_range(struct net *net, int *low, int *high); |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 211 | |
David S. Miller | fcd77db | 2014-05-15 13:43:14 -0400 | [diff] [blame] | 212 | #ifdef CONFIG_SYSCTL |
WANG Cong | 122ff24 | 2014-05-12 16:04:53 -0700 | [diff] [blame] | 213 | static inline int inet_is_local_reserved_port(struct net *net, int port) |
Amerigo Wang | e3826f1 | 2010-05-05 00:27:06 +0000 | [diff] [blame] | 214 | { |
WANG Cong | 122ff24 | 2014-05-12 16:04:53 -0700 | [diff] [blame] | 215 | if (!net->ipv4.sysctl_local_reserved_ports) |
| 216 | return 0; |
| 217 | return test_bit(port, net->ipv4.sysctl_local_reserved_ports); |
Amerigo Wang | e3826f1 | 2010-05-05 00:27:06 +0000 | [diff] [blame] | 218 | } |
WANG Cong | 20e61da | 2014-07-25 15:25:08 -0700 | [diff] [blame] | 219 | |
| 220 | static inline bool sysctl_dev_name_is_allowed(const char *name) |
| 221 | { |
| 222 | return strcmp(name, "default") != 0 && strcmp(name, "all") != 0; |
| 223 | } |
| 224 | |
WANG Cong | 122ff24 | 2014-05-12 16:04:53 -0700 | [diff] [blame] | 225 | #else |
| 226 | static inline int inet_is_local_reserved_port(struct net *net, int port) |
| 227 | { |
| 228 | return 0; |
| 229 | } |
| 230 | #endif |
Amerigo Wang | e3826f1 | 2010-05-05 00:27:06 +0000 | [diff] [blame] | 231 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 232 | /* From inetpeer.c */ |
| 233 | extern int inet_peer_threshold; |
| 234 | extern int inet_peer_minttl; |
| 235 | extern int inet_peer_maxttl; |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 236 | |
Alexander Duyck | 6648bd7 | 2012-06-21 13:58:31 +0000 | [diff] [blame] | 237 | /* From ip_input.c */ |
| 238 | extern int sysctl_ip_early_demux; |
| 239 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 240 | /* From ip_output.c */ |
| 241 | extern int sysctl_ip_dynaddr; |
| 242 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 243 | void ipfrag_init(void); |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 244 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 245 | void ip_static_sysctl_init(void); |
Al Viro | bd7b153 | 2008-07-15 16:00:59 -0400 | [diff] [blame] | 246 | |
Lorenzo Colitti | e110861 | 2014-05-13 10:17:33 -0700 | [diff] [blame] | 247 | #define IP4_REPLY_MARK(net, mark) \ |
| 248 | ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0) |
| 249 | |
David S. Miller | d18cd55 | 2011-06-23 21:28:52 -0700 | [diff] [blame] | 250 | static inline bool ip_is_fragment(const struct iphdr *iph) |
| 251 | { |
| 252 | return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; |
| 253 | } |
| 254 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | #ifdef CONFIG_INET |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 256 | #include <net/dst.h> |
| 257 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | /* The function in 2.2 was invalid, producing wrong result for |
| 259 | * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ |
| 260 | static inline |
| 261 | int ip_decrease_ttl(struct iphdr *iph) |
| 262 | { |
Al Viro | 5c78f27 | 2006-11-14 21:42:26 -0800 | [diff] [blame] | 263 | u32 check = (__force u32)iph->check; |
| 264 | check += (__force u32)htons(0x0100); |
| 265 | iph->check = (__force __sum16)(check + (check>=0xFFFF)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | return --iph->ttl; |
| 267 | } |
| 268 | |
| 269 | static inline |
| 270 | int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) |
| 271 | { |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 272 | return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 274 | !(dst_metric_locked(dst, RTAX_MTU))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | } |
| 276 | |
Hannes Frederic Sowa | f87c10a | 2014-01-09 10:01:15 +0100 | [diff] [blame] | 277 | static inline bool ip_sk_accept_pmtu(const struct sock *sk) |
| 278 | { |
Hannes Frederic Sowa | 1b34657 | 2014-02-26 01:20:42 +0100 | [diff] [blame] | 279 | return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && |
| 280 | inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT; |
Hannes Frederic Sowa | f87c10a | 2014-01-09 10:01:15 +0100 | [diff] [blame] | 281 | } |
| 282 | |
| 283 | static inline bool ip_sk_use_pmtu(const struct sock *sk) |
| 284 | { |
| 285 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; |
| 286 | } |
| 287 | |
WANG Cong | 60ff746 | 2014-05-04 16:39:18 -0700 | [diff] [blame] | 288 | static inline bool ip_sk_ignore_df(const struct sock *sk) |
Hannes Frederic Sowa | 1b34657 | 2014-02-26 01:20:42 +0100 | [diff] [blame] | 289 | { |
| 290 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || |
| 291 | inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT; |
| 292 | } |
| 293 | |
Hannes Frederic Sowa | f87c10a | 2014-01-09 10:01:15 +0100 | [diff] [blame] | 294 | static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, |
| 295 | bool forwarding) |
| 296 | { |
| 297 | struct net *net = dev_net(dst->dev); |
| 298 | |
| 299 | if (net->ipv4.sysctl_ip_fwd_use_pmtu || |
| 300 | dst_metric_locked(dst, RTAX_MTU) || |
| 301 | !forwarding) |
| 302 | return dst_mtu(dst); |
| 303 | |
| 304 | return min(dst->dev->mtu, IP_MAX_MTU); |
| 305 | } |
| 306 | |
| 307 | static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb) |
| 308 | { |
| 309 | if (!skb->sk || ip_sk_use_pmtu(skb->sk)) { |
| 310 | bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; |
| 311 | return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); |
| 312 | } else { |
| 313 | return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU); |
| 314 | } |
| 315 | } |
| 316 | |
Eric Dumazet | 04ca697 | 2014-07-26 08:58:10 +0200 | [diff] [blame] | 317 | u32 ip_idents_reserve(u32 hash, int segs); |
Eric Dumazet | 73f156a | 2014-06-02 05:26:03 -0700 | [diff] [blame] | 318 | void __ip_select_ident(struct iphdr *iph, int segs); |
| 319 | |
| 320 | static inline void ip_select_ident_segs(struct sk_buff *skb, struct sock *sk, int segs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | { |
Ansis Atteka | 703133d | 2013-09-18 15:29:53 -0700 | [diff] [blame] | 322 | struct iphdr *iph = ip_hdr(skb); |
| 323 | |
WANG Cong | 60ff746 | 2014-05-04 16:39:18 -0700 | [diff] [blame] | 324 | if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | /* This is only to work around buggy Windows95/2000 |
| 326 | * VJ compression implementations. If the ID field |
| 327 | * does not change, they drop every other packet in |
| 328 | * a TCP stream using header compression. |
| 329 | */ |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 330 | if (sk && inet_sk(sk)->inet_daddr) { |
| 331 | iph->id = htons(inet_sk(sk)->inet_id); |
Eric Dumazet | 73f156a | 2014-06-02 05:26:03 -0700 | [diff] [blame] | 332 | inet_sk(sk)->inet_id += segs; |
| 333 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | iph->id = 0; |
Eric Dumazet | 73f156a | 2014-06-02 05:26:03 -0700 | [diff] [blame] | 335 | } |
| 336 | } else { |
| 337 | __ip_select_ident(iph, segs); |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | static inline void ip_select_ident(struct sk_buff *skb, struct sock *sk) |
| 342 | { |
| 343 | ip_select_ident_segs(skb, sk, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | } |
| 345 | |
Tom Herbert | ed70fcf | 2014-05-02 16:29:38 -0700 | [diff] [blame] | 346 | static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) |
| 347 | { |
| 348 | return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, |
| 349 | skb->len, proto, 0); |
| 350 | } |
| 351 | |
Tom Herbert | b73c3d0 | 2014-07-01 21:32:17 -0700 | [diff] [blame] | 352 | static inline void inet_set_txhash(struct sock *sk) |
| 353 | { |
| 354 | struct inet_sock *inet = inet_sk(sk); |
| 355 | struct flow_keys keys; |
| 356 | |
| 357 | keys.src = inet->inet_saddr; |
| 358 | keys.dst = inet->inet_daddr; |
| 359 | keys.port16[0] = inet->inet_sport; |
| 360 | keys.port16[1] = inet->inet_dport; |
| 361 | |
| 362 | sk->sk_txhash = flow_hash_from_keys(&keys); |
| 363 | } |
| 364 | |
Tom Herbert | 1933a78 | 2014-08-22 13:34:04 -0700 | [diff] [blame] | 365 | static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto) |
| 366 | { |
| 367 | const struct iphdr *iph = skb_gro_network_header(skb); |
| 368 | |
| 369 | return csum_tcpudp_nofold(iph->saddr, iph->daddr, |
| 370 | skb_gro_len(skb), proto, 0); |
| 371 | } |
| 372 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | /* |
| 374 | * Map a multicast IP onto multicast MAC for type ethernet. |
| 375 | */ |
| 376 | |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 377 | static inline void ip_eth_mc_map(__be32 naddr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | { |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 379 | __u32 addr=ntohl(naddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | buf[0]=0x01; |
| 381 | buf[1]=0x00; |
| 382 | buf[2]=0x5e; |
| 383 | buf[5]=addr&0xFF; |
| 384 | addr>>=8; |
| 385 | buf[4]=addr&0xFF; |
| 386 | addr>>=8; |
| 387 | buf[3]=addr&0x7F; |
| 388 | } |
| 389 | |
| 390 | /* |
| 391 | * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. |
| 392 | * Leave P_Key as 0 to be filled in by driver. |
| 393 | */ |
| 394 | |
Rolf Manderscheid | a9e527e | 2007-12-10 13:38:41 -0700 | [diff] [blame] | 395 | 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] | 396 | { |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 397 | __u32 addr; |
Rolf Manderscheid | a9e527e | 2007-12-10 13:38:41 -0700 | [diff] [blame] | 398 | unsigned char scope = broadcast[5] & 0xF; |
| 399 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | buf[0] = 0; /* Reserved */ |
| 401 | buf[1] = 0xff; /* Multicast QPN */ |
| 402 | buf[2] = 0xff; |
| 403 | buf[3] = 0xff; |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 404 | addr = ntohl(naddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | buf[4] = 0xff; |
Rolf Manderscheid | a9e527e | 2007-12-10 13:38:41 -0700 | [diff] [blame] | 406 | buf[5] = 0x10 | scope; /* scope from broadcast address */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | buf[6] = 0x40; /* IPv4 signature */ |
| 408 | buf[7] = 0x1b; |
Rolf Manderscheid | a9e527e | 2007-12-10 13:38:41 -0700 | [diff] [blame] | 409 | buf[8] = broadcast[8]; /* P_Key */ |
| 410 | buf[9] = broadcast[9]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | buf[10] = 0; |
| 412 | buf[11] = 0; |
| 413 | buf[12] = 0; |
| 414 | buf[13] = 0; |
| 415 | buf[14] = 0; |
| 416 | buf[15] = 0; |
| 417 | buf[19] = addr & 0xff; |
| 418 | addr >>= 8; |
| 419 | buf[18] = addr & 0xff; |
| 420 | addr >>= 8; |
| 421 | buf[17] = addr & 0xff; |
| 422 | addr >>= 8; |
| 423 | buf[16] = addr & 0x0f; |
| 424 | } |
| 425 | |
Timo Teräs | 93ca3bb | 2011-03-28 22:40:53 +0000 | [diff] [blame] | 426 | static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) |
| 427 | { |
| 428 | if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) |
| 429 | memcpy(buf, broadcast, 4); |
| 430 | else |
| 431 | memcpy(buf, &naddr, sizeof(naddr)); |
| 432 | } |
| 433 | |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 434 | #if IS_ENABLED(CONFIG_IPV6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | #include <linux/ipv6.h> |
| 436 | #endif |
| 437 | |
| 438 | static __inline__ void inet_reset_saddr(struct sock *sk) |
| 439 | { |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 440 | inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 441 | #if IS_ENABLED(CONFIG_IPV6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | if (sk->sk_family == PF_INET6) { |
| 443 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 444 | |
| 445 | memset(&np->saddr, 0, sizeof(np->saddr)); |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 446 | memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | } |
| 448 | #endif |
| 449 | } |
| 450 | |
| 451 | #endif |
| 452 | |
Octavian Purdila | 7ad6848 | 2010-01-06 20:37:01 -0800 | [diff] [blame] | 453 | static inline int sk_mc_loop(struct sock *sk) |
| 454 | { |
| 455 | if (!sk) |
| 456 | return 1; |
| 457 | switch (sk->sk_family) { |
| 458 | case AF_INET: |
| 459 | return inet_sk(sk)->mc_loop; |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 460 | #if IS_ENABLED(CONFIG_IPV6) |
Octavian Purdila | 7ad6848 | 2010-01-06 20:37:01 -0800 | [diff] [blame] | 461 | case AF_INET6: |
| 462 | return inet6_sk(sk)->mc_loop; |
| 463 | #endif |
| 464 | } |
Octavian Purdila | cd65c3c | 2010-01-13 18:10:36 -0800 | [diff] [blame] | 465 | WARN_ON(1); |
Octavian Purdila | 7ad6848 | 2010-01-06 20:37:01 -0800 | [diff] [blame] | 466 | return 1; |
| 467 | } |
| 468 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 469 | bool ip_call_ra_chain(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | |
| 471 | /* |
Rami Rosen | b798232 | 2008-01-01 21:13:09 -0800 | [diff] [blame] | 472 | * Functions provided by ip_fragment.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | */ |
| 474 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 475 | enum ip_defrag_users { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | IP_DEFRAG_LOCAL_DELIVER, |
| 477 | IP_DEFRAG_CALL_RA_CHAIN, |
| 478 | IP_DEFRAG_CONNTRACK_IN, |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 479 | __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | IP_DEFRAG_CONNTRACK_OUT, |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 481 | __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
Patrick McHardy | 8fa9ff6 | 2009-12-15 16:59:59 +0100 | [diff] [blame] | 482 | IP_DEFRAG_CONNTRACK_BRIDGE_IN, |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 483 | __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | IP_DEFRAG_VS_IN, |
| 485 | IP_DEFRAG_VS_OUT, |
David S. Miller | 595fc71 | 2011-07-05 01:05:48 -0700 | [diff] [blame] | 486 | IP_DEFRAG_VS_FWD, |
| 487 | IP_DEFRAG_AF_PACKET, |
Eric Dumazet | bc416d9 | 2011-10-06 10:28:31 +0000 | [diff] [blame] | 488 | IP_DEFRAG_MACVLAN, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | }; |
| 490 | |
Herbert Xu | 776c729 | 2007-10-14 00:38:32 -0700 | [diff] [blame] | 491 | int ip_defrag(struct sk_buff *skb, u32 user); |
Eric Dumazet | bc416d9 | 2011-10-06 10:28:31 +0000 | [diff] [blame] | 492 | #ifdef CONFIG_INET |
| 493 | struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user); |
| 494 | #else |
| 495 | static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user) |
| 496 | { |
| 497 | return skb; |
| 498 | } |
| 499 | #endif |
Pavel Emelyanov | 6ddc082 | 2008-01-22 06:07:25 -0800 | [diff] [blame] | 500 | int ip_frag_mem(struct net *net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | |
| 502 | /* |
| 503 | * Functions provided by ip_forward.c |
| 504 | */ |
| 505 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 506 | int ip_forward(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
| 508 | /* |
| 509 | * Functions provided by ip_options.c |
| 510 | */ |
| 511 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 512 | void ip_options_build(struct sk_buff *skb, struct ip_options *opt, |
| 513 | __be32 daddr, struct rtable *rt, int is_frag); |
| 514 | int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); |
| 515 | void ip_options_fragment(struct sk_buff *skb); |
| 516 | int ip_options_compile(struct net *net, struct ip_options *opt, |
| 517 | struct sk_buff *skb); |
| 518 | int ip_options_get(struct net *net, struct ip_options_rcu **optp, |
| 519 | unsigned char *data, int optlen); |
| 520 | int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, |
| 521 | unsigned char __user *data, int optlen); |
| 522 | void ip_options_undo(struct ip_options *opt); |
| 523 | void ip_forward_options(struct sk_buff *skb); |
| 524 | int ip_options_rcv_srr(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | |
| 526 | /* |
| 527 | * Functions provided by ip_sockglue.c |
| 528 | */ |
| 529 | |
Shawn Bohrer | fbf8866 | 2013-10-07 11:01:40 -0500 | [diff] [blame] | 530 | void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 531 | void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); |
Hannes Frederic Sowa | c8e6ad0 | 2014-02-18 21:38:08 +0100 | [diff] [blame] | 532 | int ip_cmsg_send(struct net *net, struct msghdr *msg, |
| 533 | struct ipcm_cookie *ipc, bool allow_ipv6); |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 534 | int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, |
| 535 | unsigned int optlen); |
| 536 | int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, |
| 537 | int __user *optlen); |
| 538 | int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
| 539 | char __user *optval, unsigned int optlen); |
| 540 | int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
| 541 | char __user *optval, int __user *optlen); |
| 542 | int ip_ra_control(struct sock *sk, unsigned char on, |
| 543 | void (*destructor)(struct sock *)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | |
Hannes Frederic Sowa | 85fbaa7 | 2013-11-23 00:46:12 +0100 | [diff] [blame] | 545 | int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 546 | void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, |
| 547 | u32 info, u8 *payload); |
| 548 | void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, |
| 549 | u32 info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 551 | #ifdef CONFIG_PROC_FS |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 552 | int ip_misc_proc_init(void); |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 553 | #endif |
| 554 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | #endif /* _IP_H */ |