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 | * IPv4 Forwarding Information Base: policy rules. |
| 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 9 | * Thomas Graf <tgraf@suug.ch> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License |
| 13 | * as published by the Free Software Foundation; either version |
| 14 | * 2 of the License, or (at your option) any later version. |
| 15 | * |
| 16 | * Fixes: |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 17 | * Rani Assaf : local_rule cannot be deleted |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | * Marc Boucher : routing by fwmark |
| 19 | */ |
| 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/types.h> |
| 22 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/netdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/netlink.h> |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 25 | #include <linux/inetdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/init.h> |
Robert Olsson | 7b204af | 2006-03-20 17:18:53 -0800 | [diff] [blame] | 27 | #include <linux/list.h> |
| 28 | #include <linux/rcupdate.h> |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 29 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <net/ip.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <net/route.h> |
| 32 | #include <net/tcp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <net/ip_fib.h> |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 34 | #include <net/fib_rules.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Eric Dumazet | 6a31d2a | 2010-10-04 20:00:18 +0000 | [diff] [blame] | 36 | struct fib4_rule { |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 37 | struct fib_rule common; |
| 38 | u8 dst_len; |
| 39 | u8 src_len; |
| 40 | u8 tos; |
Al Viro | 81f7bf6 | 2006-09-27 18:40:00 -0700 | [diff] [blame] | 41 | __be32 src; |
| 42 | __be32 srcmask; |
| 43 | __be32 dst; |
| 44 | __be32 dstmask; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 45 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 46 | u32 tclassid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | }; |
| 49 | |
Ido Schimmel | 3c71006 | 2017-03-16 09:08:12 +0100 | [diff] [blame] | 50 | static bool fib4_rule_matchall(const struct fib_rule *rule) |
| 51 | { |
| 52 | struct fib4_rule *r = container_of(rule, struct fib4_rule, common); |
| 53 | |
| 54 | if (r->dst_len || r->src_len || r->tos) |
| 55 | return false; |
| 56 | return fib_rule_matchall(rule); |
| 57 | } |
| 58 | |
| 59 | bool fib4_rule_default(const struct fib_rule *rule) |
| 60 | { |
| 61 | if (!fib4_rule_matchall(rule) || rule->action != FR_ACT_TO_TBL || |
| 62 | rule->l3mdev) |
| 63 | return false; |
| 64 | if (rule->table != RT_TABLE_LOCAL && rule->table != RT_TABLE_MAIN && |
| 65 | rule->table != RT_TABLE_DEFAULT) |
| 66 | return false; |
| 67 | return true; |
| 68 | } |
| 69 | EXPORT_SYMBOL_GPL(fib4_rule_default); |
| 70 | |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 71 | int __fib_lookup(struct net *net, struct flowi4 *flp, |
| 72 | struct fib_result *res, unsigned int flags) |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 73 | { |
| 74 | struct fib_lookup_arg arg = { |
| 75 | .result = res, |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 76 | .flags = flags, |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 77 | }; |
| 78 | int err; |
| 79 | |
David Ahern | 9ee0034 | 2016-09-10 12:09:52 -0700 | [diff] [blame] | 80 | /* update flow if oif or iif point to device enslaved to l3mdev */ |
| 81 | l3mdev_update_flow(net, flowi4_to_flowi(flp)); |
| 82 | |
David S. Miller | 22bd5b9 | 2011-03-11 19:54:08 -0500 | [diff] [blame] | 83 | err = fib_rules_lookup(net->ipv4.rules_ops, flowi4_to_flowi(flp), 0, &arg); |
David S. Miller | 85b91b0 | 2012-07-13 08:21:29 -0700 | [diff] [blame] | 84 | #ifdef CONFIG_IP_ROUTE_CLASSID |
| 85 | if (arg.rule) |
| 86 | res->tclassid = ((struct fib4_rule *)arg.rule)->tclassid; |
| 87 | else |
| 88 | res->tclassid = 0; |
| 89 | #endif |
Panu Matilainen | 49dd18b | 2014-11-14 13:14:32 +0200 | [diff] [blame] | 90 | |
| 91 | if (err == -ESRCH) |
| 92 | err = -ENETUNREACH; |
| 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | return err; |
| 95 | } |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 96 | EXPORT_SYMBOL_GPL(__fib_lookup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Adrian Bunk | 8ce11e6 | 2006-08-07 21:50:48 -0700 | [diff] [blame] | 98 | static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp, |
| 99 | int flags, struct fib_lookup_arg *arg) |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 100 | { |
| 101 | int err = -EAGAIN; |
| 102 | struct fib_table *tbl; |
David Ahern | 96c63fa | 2016-06-08 10:55:39 -0700 | [diff] [blame] | 103 | u32 tb_id; |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 104 | |
| 105 | switch (rule->action) { |
| 106 | case FR_ACT_TO_TBL: |
| 107 | break; |
| 108 | |
| 109 | case FR_ACT_UNREACHABLE: |
Alexander Duyck | 345e9b5 | 2014-12-31 10:56:24 -0800 | [diff] [blame] | 110 | return -ENETUNREACH; |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 111 | |
| 112 | case FR_ACT_PROHIBIT: |
Alexander Duyck | 345e9b5 | 2014-12-31 10:56:24 -0800 | [diff] [blame] | 113 | return -EACCES; |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 114 | |
| 115 | case FR_ACT_BLACKHOLE: |
| 116 | default: |
Alexander Duyck | 345e9b5 | 2014-12-31 10:56:24 -0800 | [diff] [blame] | 117 | return -EINVAL; |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 118 | } |
| 119 | |
Alexander Duyck | 345e9b5 | 2014-12-31 10:56:24 -0800 | [diff] [blame] | 120 | rcu_read_lock(); |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 121 | |
David Ahern | 96c63fa | 2016-06-08 10:55:39 -0700 | [diff] [blame] | 122 | tb_id = fib_rule_get_table(rule, arg); |
| 123 | tbl = fib_get_table(rule->fr_net, tb_id); |
Alexander Duyck | 345e9b5 | 2014-12-31 10:56:24 -0800 | [diff] [blame] | 124 | if (tbl) |
| 125 | err = fib_table_lookup(tbl, &flp->u.ip4, |
| 126 | (struct fib_result *)arg->result, |
| 127 | arg->flags); |
| 128 | |
| 129 | rcu_read_unlock(); |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 130 | return err; |
| 131 | } |
| 132 | |
Stefan Tomanek | 7764a45 | 2013-08-01 02:17:15 +0200 | [diff] [blame] | 133 | static bool fib4_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg) |
| 134 | { |
Stefan Tomanek | 6ef94cf | 2013-08-02 17:19:56 +0200 | [diff] [blame] | 135 | struct fib_result *result = (struct fib_result *) arg->result; |
Stefan Tomanek | 673498b | 2013-12-10 23:21:25 +0100 | [diff] [blame] | 136 | struct net_device *dev = NULL; |
| 137 | |
| 138 | if (result->fi) |
| 139 | dev = result->fi->fib_dev; |
Stefan Tomanek | 6ef94cf | 2013-08-02 17:19:56 +0200 | [diff] [blame] | 140 | |
Stefan Tomanek | 7764a45 | 2013-08-01 02:17:15 +0200 | [diff] [blame] | 141 | /* do not accept result if the route does |
| 142 | * not meet the required prefix length |
| 143 | */ |
Stefan Tomanek | 73f5698 | 2013-08-03 14:14:43 +0200 | [diff] [blame] | 144 | if (result->prefixlen <= rule->suppress_prefixlen) |
Stefan Tomanek | 6ef94cf | 2013-08-02 17:19:56 +0200 | [diff] [blame] | 145 | goto suppress_route; |
| 146 | |
| 147 | /* do not accept result if the route uses a device |
| 148 | * belonging to a forbidden interface group |
| 149 | */ |
| 150 | if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup) |
| 151 | goto suppress_route; |
| 152 | |
Stefan Tomanek | 7764a45 | 2013-08-01 02:17:15 +0200 | [diff] [blame] | 153 | return false; |
Stefan Tomanek | 6ef94cf | 2013-08-02 17:19:56 +0200 | [diff] [blame] | 154 | |
| 155 | suppress_route: |
| 156 | if (!(arg->flags & FIB_LOOKUP_NOREF)) |
| 157 | fib_info_put(result->fi); |
| 158 | return true; |
Stefan Tomanek | 7764a45 | 2013-08-01 02:17:15 +0200 | [diff] [blame] | 159 | } |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 160 | |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 161 | static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) |
| 162 | { |
| 163 | struct fib4_rule *r = (struct fib4_rule *) rule; |
David S. Miller | 9ade228 | 2011-03-12 02:02:42 -0500 | [diff] [blame] | 164 | struct flowi4 *fl4 = &fl->u.ip4; |
| 165 | __be32 daddr = fl4->daddr; |
| 166 | __be32 saddr = fl4->saddr; |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 167 | |
| 168 | if (((saddr ^ r->src) & r->srcmask) || |
| 169 | ((daddr ^ r->dst) & r->dstmask)) |
| 170 | return 0; |
| 171 | |
David S. Miller | 9ade228 | 2011-03-12 02:02:42 -0500 | [diff] [blame] | 172 | if (r->tos && (r->tos != fl4->flowi4_tos)) |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 173 | return 0; |
| 174 | |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 175 | return 1; |
| 176 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame] | 178 | static struct fib_table *fib_empty_table(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | { |
Patrick McHardy | 2dfe55b | 2006-08-10 23:08:33 -0700 | [diff] [blame] | 180 | u32 id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
| 182 | for (id = 1; id <= RT_TABLE_MAX; id++) |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 183 | if (!fib_get_table(net, id)) |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame] | 184 | return fib_new_table(net, id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | return NULL; |
| 186 | } |
| 187 | |
Ido Schimmel | 5d7bfd1 | 2017-03-16 09:08:14 +0100 | [diff] [blame] | 188 | static int call_fib_rule_notifier(struct notifier_block *nb, struct net *net, |
| 189 | enum fib_event_type event_type, |
| 190 | struct fib_rule *rule) |
| 191 | { |
| 192 | struct fib_rule_notifier_info info = { |
| 193 | .rule = rule, |
| 194 | }; |
| 195 | |
| 196 | return call_fib_notifier(nb, net, event_type, &info.info); |
| 197 | } |
| 198 | |
Jiri Pirko | b90eb75 | 2016-09-26 12:52:29 +0200 | [diff] [blame] | 199 | static int call_fib_rule_notifiers(struct net *net, |
Ido Schimmel | 6a003a5 | 2017-03-16 09:08:13 +0100 | [diff] [blame] | 200 | enum fib_event_type event_type, |
| 201 | struct fib_rule *rule) |
Jiri Pirko | b90eb75 | 2016-09-26 12:52:29 +0200 | [diff] [blame] | 202 | { |
Ido Schimmel | 6a003a5 | 2017-03-16 09:08:13 +0100 | [diff] [blame] | 203 | struct fib_rule_notifier_info info = { |
| 204 | .rule = rule, |
| 205 | }; |
Jiri Pirko | b90eb75 | 2016-09-26 12:52:29 +0200 | [diff] [blame] | 206 | |
Ido Schimmel | 6a003a5 | 2017-03-16 09:08:13 +0100 | [diff] [blame] | 207 | return call_fib_notifiers(net, event_type, &info.info); |
Jiri Pirko | b90eb75 | 2016-09-26 12:52:29 +0200 | [diff] [blame] | 208 | } |
| 209 | |
Ido Schimmel | 5d7bfd1 | 2017-03-16 09:08:14 +0100 | [diff] [blame] | 210 | /* Called with rcu_read_lock() */ |
Ido Schimmel | d05f7a7 | 2017-03-10 08:56:19 +0100 | [diff] [blame] | 211 | void fib_rules_notify(struct net *net, struct notifier_block *nb) |
Ido Schimmel | c024389 | 2017-03-10 08:56:18 +0100 | [diff] [blame] | 212 | { |
Ido Schimmel | 5d7bfd1 | 2017-03-16 09:08:14 +0100 | [diff] [blame] | 213 | struct fib_rules_ops *ops = net->ipv4.rules_ops; |
| 214 | struct fib_rule *rule; |
Ido Schimmel | c024389 | 2017-03-10 08:56:18 +0100 | [diff] [blame] | 215 | |
Ido Schimmel | 5d7bfd1 | 2017-03-16 09:08:14 +0100 | [diff] [blame] | 216 | list_for_each_entry_rcu(rule, &ops->rules_list, list) |
| 217 | call_fib_rule_notifier(nb, net, FIB_EVENT_RULE_ADD, rule); |
Ido Schimmel | c024389 | 2017-03-10 08:56:18 +0100 | [diff] [blame] | 218 | } |
| 219 | |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 220 | static const struct nla_policy fib4_rule_policy[FRA_MAX+1] = { |
Thomas Graf | 1f6c955 | 2006-11-09 15:22:48 -0800 | [diff] [blame] | 221 | FRA_GENERIC_POLICY, |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 222 | [FRA_FLOW] = { .type = NLA_U32 }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | }; |
| 224 | |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 225 | static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb, |
Rami Rosen | 8b3521e | 2009-05-11 05:52:49 +0000 | [diff] [blame] | 226 | struct fib_rule_hdr *frh, |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 227 | struct nlattr **tb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 229 | struct net *net = sock_net(skb->sk); |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 230 | int err = -EINVAL; |
| 231 | struct fib4_rule *rule4 = (struct fib4_rule *) rule; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | |
Thomas Graf | e1701c6 | 2007-03-24 12:46:02 -0700 | [diff] [blame] | 233 | if (frh->tos & ~IPTOS_TOS_MASK) |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 234 | goto errout; |
| 235 | |
Alexander Duyck | 0ddcf43 | 2015-03-06 13:47:00 -0800 | [diff] [blame] | 236 | /* split local/main if they are not already split */ |
| 237 | err = fib_unmerge(net); |
| 238 | if (err) |
| 239 | goto errout; |
| 240 | |
David Ahern | 96c63fa | 2016-06-08 10:55:39 -0700 | [diff] [blame] | 241 | if (rule->table == RT_TABLE_UNSPEC && !rule->l3mdev) { |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 242 | if (rule->action == FR_ACT_TO_TBL) { |
| 243 | struct fib_table *table; |
| 244 | |
Denis V. Lunev | e4e4971 | 2008-01-10 03:27:51 -0800 | [diff] [blame] | 245 | table = fib_empty_table(net); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 246 | if (!table) { |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 247 | err = -ENOBUFS; |
| 248 | goto errout; |
| 249 | } |
| 250 | |
| 251 | rule->table = table->tb_id; |
| 252 | } |
| 253 | } |
| 254 | |
Thomas Graf | e1701c6 | 2007-03-24 12:46:02 -0700 | [diff] [blame] | 255 | if (frh->src_len) |
Jiri Benc | 67b61f6 | 2015-03-29 16:59:26 +0200 | [diff] [blame] | 256 | rule4->src = nla_get_in_addr(tb[FRA_SRC]); |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 257 | |
Thomas Graf | e1701c6 | 2007-03-24 12:46:02 -0700 | [diff] [blame] | 258 | if (frh->dst_len) |
Jiri Benc | 67b61f6 | 2015-03-29 16:59:26 +0200 | [diff] [blame] | 259 | rule4->dst = nla_get_in_addr(tb[FRA_DST]); |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 260 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 261 | #ifdef CONFIG_IP_ROUTE_CLASSID |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 262 | if (tb[FRA_FLOW]) { |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 263 | rule4->tclassid = nla_get_u32(tb[FRA_FLOW]); |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 264 | if (rule4->tclassid) |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 265 | net->ipv4.fib_num_tclassid_users++; |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 266 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 269 | rule4->src_len = frh->src_len; |
| 270 | rule4->srcmask = inet_make_mask(rule4->src_len); |
| 271 | rule4->dst_len = frh->dst_len; |
| 272 | rule4->dstmask = inet_make_mask(rule4->dst_len); |
| 273 | rule4->tos = frh->tos; |
| 274 | |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 275 | net->ipv4.fib_has_custom_rules = true; |
Ido Schimmel | 6a003a5 | 2017-03-16 09:08:13 +0100 | [diff] [blame] | 276 | call_fib_rule_notifiers(net, FIB_EVENT_RULE_ADD, rule); |
Scott Feldman | 104616e | 2015-03-05 21:21:16 -0800 | [diff] [blame] | 277 | |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 278 | err = 0; |
| 279 | errout: |
| 280 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | } |
| 282 | |
Alexander Duyck | 0ddcf43 | 2015-03-06 13:47:00 -0800 | [diff] [blame] | 283 | static int fib4_rule_delete(struct fib_rule *rule) |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 284 | { |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 285 | struct net *net = rule->fr_net; |
Alexander Duyck | 0ddcf43 | 2015-03-06 13:47:00 -0800 | [diff] [blame] | 286 | int err; |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 287 | |
Alexander Duyck | 0ddcf43 | 2015-03-06 13:47:00 -0800 | [diff] [blame] | 288 | /* split local/main if they are not already split */ |
| 289 | err = fib_unmerge(net); |
| 290 | if (err) |
| 291 | goto errout; |
| 292 | |
| 293 | #ifdef CONFIG_IP_ROUTE_CLASSID |
| 294 | if (((struct fib4_rule *)rule)->tclassid) |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 295 | net->ipv4.fib_num_tclassid_users--; |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 296 | #endif |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 297 | net->ipv4.fib_has_custom_rules = true; |
Ido Schimmel | 6a003a5 | 2017-03-16 09:08:13 +0100 | [diff] [blame] | 298 | call_fib_rule_notifiers(net, FIB_EVENT_RULE_DEL, rule); |
Alexander Duyck | 0ddcf43 | 2015-03-06 13:47:00 -0800 | [diff] [blame] | 299 | errout: |
| 300 | return err; |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 301 | } |
| 302 | |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 303 | static int fib4_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, |
| 304 | struct nlattr **tb) |
Patrick McHardy | a5cdc03 | 2006-03-23 01:16:06 -0800 | [diff] [blame] | 305 | { |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 306 | struct fib4_rule *rule4 = (struct fib4_rule *) rule; |
Patrick McHardy | a5cdc03 | 2006-03-23 01:16:06 -0800 | [diff] [blame] | 307 | |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 308 | if (frh->src_len && (rule4->src_len != frh->src_len)) |
| 309 | return 0; |
| 310 | |
| 311 | if (frh->dst_len && (rule4->dst_len != frh->dst_len)) |
| 312 | return 0; |
| 313 | |
| 314 | if (frh->tos && (rule4->tos != frh->tos)) |
| 315 | return 0; |
| 316 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 317 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 318 | if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW]))) |
| 319 | return 0; |
| 320 | #endif |
| 321 | |
Jiri Benc | 67b61f6 | 2015-03-29 16:59:26 +0200 | [diff] [blame] | 322 | if (frh->src_len && (rule4->src != nla_get_in_addr(tb[FRA_SRC]))) |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 323 | return 0; |
| 324 | |
Jiri Benc | 67b61f6 | 2015-03-29 16:59:26 +0200 | [diff] [blame] | 325 | if (frh->dst_len && (rule4->dst != nla_get_in_addr(tb[FRA_DST]))) |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 326 | return 0; |
| 327 | |
| 328 | return 1; |
| 329 | } |
| 330 | |
| 331 | static int fib4_rule_fill(struct fib_rule *rule, struct sk_buff *skb, |
Rami Rosen | 04af8cf | 2009-05-20 17:26:23 -0700 | [diff] [blame] | 332 | struct fib_rule_hdr *frh) |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 333 | { |
| 334 | struct fib4_rule *rule4 = (struct fib4_rule *) rule; |
| 335 | |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 336 | frh->dst_len = rule4->dst_len; |
| 337 | frh->src_len = rule4->src_len; |
| 338 | frh->tos = rule4->tos; |
| 339 | |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 340 | if ((rule4->dst_len && |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 341 | nla_put_in_addr(skb, FRA_DST, rule4->dst)) || |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 342 | (rule4->src_len && |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 343 | nla_put_in_addr(skb, FRA_SRC, rule4->src))) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 344 | goto nla_put_failure; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 345 | #ifdef CONFIG_IP_ROUTE_CLASSID |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 346 | if (rule4->tclassid && |
| 347 | nla_put_u32(skb, FRA_FLOW, rule4->tclassid)) |
| 348 | goto nla_put_failure; |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 349 | #endif |
| 350 | return 0; |
| 351 | |
| 352 | nla_put_failure: |
| 353 | return -ENOBUFS; |
| 354 | } |
| 355 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 356 | static size_t fib4_rule_nlmsg_payload(struct fib_rule *rule) |
| 357 | { |
| 358 | return nla_total_size(4) /* dst */ |
| 359 | + nla_total_size(4) /* src */ |
| 360 | + nla_total_size(4); /* flow */ |
| 361 | } |
| 362 | |
Denis V. Lunev | ae299fc | 2008-07-05 19:01:28 -0700 | [diff] [blame] | 363 | static void fib4_rule_flush_cache(struct fib_rules_ops *ops) |
Thomas Graf | 73417f6 | 2007-03-27 13:56:52 -0700 | [diff] [blame] | 364 | { |
Nicolas Dichtel | bafa6d9 | 2012-09-07 00:45:29 +0000 | [diff] [blame] | 365 | rt_cache_flush(ops->fro_net); |
Thomas Graf | 73417f6 | 2007-03-27 13:56:52 -0700 | [diff] [blame] | 366 | } |
| 367 | |
Andi Kleen | 04a6f82 | 2012-10-04 17:12:11 -0700 | [diff] [blame] | 368 | static const struct fib_rules_ops __net_initconst fib4_rules_ops_template = { |
Patrick McHardy | 25239ce | 2010-04-26 16:02:05 +0200 | [diff] [blame] | 369 | .family = AF_INET, |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 370 | .rule_size = sizeof(struct fib4_rule), |
Thomas Graf | e1701c6 | 2007-03-24 12:46:02 -0700 | [diff] [blame] | 371 | .addr_size = sizeof(u32), |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 372 | .action = fib4_rule_action, |
Stefan Tomanek | 7764a45 | 2013-08-01 02:17:15 +0200 | [diff] [blame] | 373 | .suppress = fib4_rule_suppress, |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 374 | .match = fib4_rule_match, |
| 375 | .configure = fib4_rule_configure, |
David S. Miller | 7a9bc9b | 2012-06-29 01:32:45 -0700 | [diff] [blame] | 376 | .delete = fib4_rule_delete, |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 377 | .compare = fib4_rule_compare, |
| 378 | .fill = fib4_rule_fill, |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 379 | .nlmsg_payload = fib4_rule_nlmsg_payload, |
Thomas Graf | 73417f6 | 2007-03-27 13:56:52 -0700 | [diff] [blame] | 380 | .flush_cache = fib4_rule_flush_cache, |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 381 | .nlgroup = RTNLGRP_IPV4_RULE, |
| 382 | .policy = fib4_rule_policy, |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 383 | .owner = THIS_MODULE, |
| 384 | }; |
| 385 | |
Denis V. Lunev | e4e4971 | 2008-01-10 03:27:51 -0800 | [diff] [blame] | 386 | static int fib_default_rules_init(struct fib_rules_ops *ops) |
Denis V. Lunev | 2994c63 | 2007-11-10 22:12:03 -0800 | [diff] [blame] | 387 | { |
| 388 | int err; |
| 389 | |
Patrick McHardy | 5adef18 | 2009-12-03 01:25:57 +0000 | [diff] [blame] | 390 | err = fib_default_rule_add(ops, 0, RT_TABLE_LOCAL, 0); |
Denis V. Lunev | 2994c63 | 2007-11-10 22:12:03 -0800 | [diff] [blame] | 391 | if (err < 0) |
| 392 | return err; |
Denis V. Lunev | e4e4971 | 2008-01-10 03:27:51 -0800 | [diff] [blame] | 393 | err = fib_default_rule_add(ops, 0x7FFE, RT_TABLE_MAIN, 0); |
Denis V. Lunev | 2994c63 | 2007-11-10 22:12:03 -0800 | [diff] [blame] | 394 | if (err < 0) |
| 395 | return err; |
Denis V. Lunev | e4e4971 | 2008-01-10 03:27:51 -0800 | [diff] [blame] | 396 | err = fib_default_rule_add(ops, 0x7FFF, RT_TABLE_DEFAULT, 0); |
Denis V. Lunev | 2994c63 | 2007-11-10 22:12:03 -0800 | [diff] [blame] | 397 | if (err < 0) |
| 398 | return err; |
| 399 | return 0; |
| 400 | } |
| 401 | |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 402 | int __net_init fib4_rules_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | { |
Denis V. Lunev | dbb5016 | 2008-01-10 03:21:49 -0800 | [diff] [blame] | 404 | int err; |
Denis V. Lunev | e4e4971 | 2008-01-10 03:27:51 -0800 | [diff] [blame] | 405 | struct fib_rules_ops *ops; |
Denis V. Lunev | dbb5016 | 2008-01-10 03:21:49 -0800 | [diff] [blame] | 406 | |
Eric W. Biederman | e9c5158 | 2009-12-03 12:22:55 -0800 | [diff] [blame] | 407 | ops = fib_rules_register(&fib4_rules_ops_template, net); |
| 408 | if (IS_ERR(ops)) |
| 409 | return PTR_ERR(ops); |
Denis V. Lunev | e4e4971 | 2008-01-10 03:27:51 -0800 | [diff] [blame] | 410 | |
| 411 | err = fib_default_rules_init(ops); |
Denis V. Lunev | dbb5016 | 2008-01-10 03:21:49 -0800 | [diff] [blame] | 412 | if (err < 0) |
| 413 | goto fail; |
Denis V. Lunev | e4e4971 | 2008-01-10 03:27:51 -0800 | [diff] [blame] | 414 | net->ipv4.rules_ops = ops; |
David S. Miller | f4530fa | 2012-07-05 22:13:13 -0700 | [diff] [blame] | 415 | net->ipv4.fib_has_custom_rules = false; |
Denis V. Lunev | dbb5016 | 2008-01-10 03:21:49 -0800 | [diff] [blame] | 416 | return 0; |
| 417 | |
| 418 | fail: |
| 419 | /* also cleans all rules already added */ |
Denis V. Lunev | 9e3a548 | 2008-01-20 16:46:41 -0800 | [diff] [blame] | 420 | fib_rules_unregister(ops); |
Denis V. Lunev | dbb5016 | 2008-01-10 03:21:49 -0800 | [diff] [blame] | 421 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | } |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 423 | |
| 424 | void __net_exit fib4_rules_exit(struct net *net) |
| 425 | { |
Denis V. Lunev | 9e3a548 | 2008-01-20 16:46:41 -0800 | [diff] [blame] | 426 | fib_rules_unregister(net->ipv4.rules_ops); |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 427 | } |