Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/ipv6/fib6_rules.c IPv6 Routing Policy Rules |
| 3 | * |
| 4 | * Copyright (C)2003-2006 Helsinki University of Technology |
| 5 | * Copyright (C)2003-2006 USAGI/WIDE Project |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License as |
| 9 | * published by the Free Software Foundation, version 2. |
| 10 | * |
| 11 | * Authors |
| 12 | * Thomas Graf <tgraf@suug.ch> |
| 13 | * Ville Nuorvala <vnuorval@tcs.hut.fi> |
| 14 | */ |
| 15 | |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 16 | #include <linux/netdevice.h> |
| 17 | |
| 18 | #include <net/fib_rules.h> |
| 19 | #include <net/ipv6.h> |
YOSHIFUJI Hideaki | 29f6af7 | 2007-04-06 11:45:39 -0700 | [diff] [blame] | 20 | #include <net/addrconf.h> |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 21 | #include <net/ip6_route.h> |
| 22 | #include <net/netlink.h> |
| 23 | |
| 24 | struct fib6_rule |
| 25 | { |
| 26 | struct fib_rule common; |
| 27 | struct rt6key src; |
| 28 | struct rt6key dst; |
| 29 | u8 tclass; |
| 30 | }; |
| 31 | |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 32 | struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi *fl, |
| 33 | int flags, pol_lookup_t lookup) |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 34 | { |
| 35 | struct fib_lookup_arg arg = { |
| 36 | .lookup_ptr = lookup, |
| 37 | }; |
| 38 | |
Daniel Lezcano | dcabb81 | 2008-03-03 23:33:08 -0800 | [diff] [blame] | 39 | fib_rules_lookup(net->ipv6.fib6_rules_ops, fl, flags, &arg); |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 40 | if (arg.rule) |
| 41 | fib_rule_put(arg.rule); |
| 42 | |
Ville Nuorvala | b142955 | 2006-08-08 16:44:17 -0700 | [diff] [blame] | 43 | if (arg.result) |
YOSHIFUJI Hideaki | 40aa7b9 | 2006-10-19 13:50:09 +0900 | [diff] [blame] | 44 | return arg.result; |
Ville Nuorvala | b142955 | 2006-08-08 16:44:17 -0700 | [diff] [blame] | 45 | |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 46 | dst_hold(&net->ipv6.ip6_null_entry->u.dst); |
| 47 | return &net->ipv6.ip6_null_entry->u.dst; |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 48 | } |
| 49 | |
Adrian Bunk | 8ce11e6 | 2006-08-07 21:50:48 -0700 | [diff] [blame] | 50 | static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp, |
| 51 | int flags, struct fib_lookup_arg *arg) |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 52 | { |
| 53 | struct rt6_info *rt = NULL; |
| 54 | struct fib6_table *table; |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 55 | struct net *net = rule->fr_net; |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 56 | pol_lookup_t lookup = arg->lookup_ptr; |
| 57 | |
| 58 | switch (rule->action) { |
| 59 | case FR_ACT_TO_TBL: |
| 60 | break; |
| 61 | case FR_ACT_UNREACHABLE: |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 62 | rt = net->ipv6.ip6_null_entry; |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 63 | goto discard_pkt; |
| 64 | default: |
| 65 | case FR_ACT_BLACKHOLE: |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 66 | rt = net->ipv6.ip6_blk_hole_entry; |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 67 | goto discard_pkt; |
| 68 | case FR_ACT_PROHIBIT: |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 69 | rt = net->ipv6.ip6_prohibit_entry; |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 70 | goto discard_pkt; |
| 71 | } |
| 72 | |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 73 | table = fib6_get_table(net, rule->table); |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 74 | if (table) |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 75 | rt = lookup(net, table, flp, flags); |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 76 | |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 77 | if (rt != net->ipv6.ip6_null_entry) { |
YOSHIFUJI Hideaki | 29f6af7 | 2007-04-06 11:45:39 -0700 | [diff] [blame] | 78 | struct fib6_rule *r = (struct fib6_rule *)rule; |
| 79 | |
| 80 | /* |
| 81 | * If we need to find a source address for this traffic, |
| 82 | * we check the result if it meets requirement of the rule. |
| 83 | */ |
| 84 | if ((rule->flags & FIB_RULE_FIND_SADDR) && |
| 85 | r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) { |
| 86 | struct in6_addr saddr; |
YOSHIFUJI Hideaki | 7cbca67 | 2008-03-25 09:37:42 +0900 | [diff] [blame] | 87 | |
Brian Haley | 191cd58 | 2008-08-14 15:33:21 -0700 | [diff] [blame] | 88 | if (ipv6_dev_get_saddr(net, |
| 89 | ip6_dst_idev(&rt->u.dst)->dev, |
YOSHIFUJI Hideaki / 吉藤英明 | 0c9a2ac | 2010-03-07 00:14:44 +0000 | [diff] [blame] | 90 | &flp->fl6_dst, |
| 91 | rt6_flags2srcprefs(flags), |
YOSHIFUJI Hideaki | 7cbca67 | 2008-03-25 09:37:42 +0900 | [diff] [blame] | 92 | &saddr)) |
YOSHIFUJI Hideaki | 29f6af7 | 2007-04-06 11:45:39 -0700 | [diff] [blame] | 93 | goto again; |
| 94 | if (!ipv6_prefix_equal(&saddr, &r->src.addr, |
| 95 | r->src.plen)) |
| 96 | goto again; |
| 97 | ipv6_addr_copy(&flp->fl6_src, &saddr); |
| 98 | } |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 99 | goto out; |
YOSHIFUJI Hideaki | 29f6af7 | 2007-04-06 11:45:39 -0700 | [diff] [blame] | 100 | } |
| 101 | again: |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 102 | dst_release(&rt->u.dst); |
Patrick McHardy | 3226f688 | 2006-08-06 22:24:08 -0700 | [diff] [blame] | 103 | rt = NULL; |
| 104 | goto out; |
| 105 | |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 106 | discard_pkt: |
| 107 | dst_hold(&rt->u.dst); |
| 108 | out: |
| 109 | arg->result = rt; |
| 110 | return rt == NULL ? -EAGAIN : 0; |
| 111 | } |
| 112 | |
| 113 | |
| 114 | static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) |
| 115 | { |
| 116 | struct fib6_rule *r = (struct fib6_rule *) rule; |
| 117 | |
Thomas Graf | adaa70b | 2006-10-13 15:01:03 -0700 | [diff] [blame] | 118 | if (r->dst.plen && |
| 119 | !ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen)) |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 120 | return 0; |
| 121 | |
YOSHIFUJI Hideaki | 29f6af7 | 2007-04-06 11:45:39 -0700 | [diff] [blame] | 122 | /* |
| 123 | * If FIB_RULE_FIND_SADDR is set and we do not have a |
| 124 | * source address for the traffic, we defer check for |
| 125 | * source address. |
| 126 | */ |
Thomas Graf | adaa70b | 2006-10-13 15:01:03 -0700 | [diff] [blame] | 127 | if (r->src.plen) { |
YOSHIFUJI Hideaki | 29f6af7 | 2007-04-06 11:45:39 -0700 | [diff] [blame] | 128 | if (flags & RT6_LOOKUP_F_HAS_SADDR) { |
| 129 | if (!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, |
| 130 | r->src.plen)) |
| 131 | return 0; |
| 132 | } else if (!(r->common.flags & FIB_RULE_FIND_SADDR)) |
Thomas Graf | adaa70b | 2006-10-13 15:01:03 -0700 | [diff] [blame] | 133 | return 0; |
| 134 | } |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 135 | |
YOSHIFUJI Hideaki | 2cc67cc | 2006-08-21 19:18:57 +0900 | [diff] [blame] | 136 | if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff)) |
| 137 | return 0; |
| 138 | |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 139 | return 1; |
| 140 | } |
| 141 | |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 142 | static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = { |
Thomas Graf | 1f6c955 | 2006-11-09 15:22:48 -0800 | [diff] [blame] | 143 | FRA_GENERIC_POLICY, |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 144 | }; |
| 145 | |
| 146 | static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb, |
Rami Rosen | 8b3521e | 2009-05-11 05:52:49 +0000 | [diff] [blame] | 147 | struct fib_rule_hdr *frh, |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 148 | struct nlattr **tb) |
| 149 | { |
| 150 | int err = -EINVAL; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 151 | struct net *net = sock_net(skb->sk); |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 152 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
| 153 | |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 154 | if (rule->action == FR_ACT_TO_TBL) { |
| 155 | if (rule->table == RT6_TABLE_UNSPEC) |
| 156 | goto errout; |
| 157 | |
Daniel Lezcano | dcabb81 | 2008-03-03 23:33:08 -0800 | [diff] [blame] | 158 | if (fib6_new_table(net, rule->table) == NULL) { |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 159 | err = -ENOBUFS; |
| 160 | goto errout; |
| 161 | } |
| 162 | } |
| 163 | |
Thomas Graf | e1701c6 | 2007-03-24 12:46:02 -0700 | [diff] [blame] | 164 | if (frh->src_len) |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 165 | nla_memcpy(&rule6->src.addr, tb[FRA_SRC], |
| 166 | sizeof(struct in6_addr)); |
| 167 | |
Thomas Graf | e1701c6 | 2007-03-24 12:46:02 -0700 | [diff] [blame] | 168 | if (frh->dst_len) |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 169 | nla_memcpy(&rule6->dst.addr, tb[FRA_DST], |
| 170 | sizeof(struct in6_addr)); |
| 171 | |
| 172 | rule6->src.plen = frh->src_len; |
| 173 | rule6->dst.plen = frh->dst_len; |
| 174 | rule6->tclass = frh->tos; |
| 175 | |
| 176 | err = 0; |
| 177 | errout: |
| 178 | return err; |
| 179 | } |
| 180 | |
| 181 | static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, |
| 182 | struct nlattr **tb) |
| 183 | { |
| 184 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
| 185 | |
| 186 | if (frh->src_len && (rule6->src.plen != frh->src_len)) |
| 187 | return 0; |
| 188 | |
| 189 | if (frh->dst_len && (rule6->dst.plen != frh->dst_len)) |
| 190 | return 0; |
| 191 | |
| 192 | if (frh->tos && (rule6->tclass != frh->tos)) |
| 193 | return 0; |
| 194 | |
Thomas Graf | e1701c6 | 2007-03-24 12:46:02 -0700 | [diff] [blame] | 195 | if (frh->src_len && |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 196 | nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr))) |
| 197 | return 0; |
| 198 | |
Thomas Graf | e1701c6 | 2007-03-24 12:46:02 -0700 | [diff] [blame] | 199 | if (frh->dst_len && |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 200 | nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr))) |
| 201 | return 0; |
| 202 | |
| 203 | return 1; |
| 204 | } |
| 205 | |
| 206 | static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb, |
Rami Rosen | 04af8cf | 2009-05-20 17:26:23 -0700 | [diff] [blame] | 207 | struct fib_rule_hdr *frh) |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 208 | { |
| 209 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
| 210 | |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 211 | frh->dst_len = rule6->dst.plen; |
| 212 | frh->src_len = rule6->src.plen; |
| 213 | frh->tos = rule6->tclass; |
| 214 | |
| 215 | if (rule6->dst.plen) |
| 216 | NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr), |
| 217 | &rule6->dst.addr); |
| 218 | |
| 219 | if (rule6->src.plen) |
| 220 | NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr), |
| 221 | &rule6->src.addr); |
| 222 | |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 223 | return 0; |
| 224 | |
| 225 | nla_put_failure: |
| 226 | return -ENOBUFS; |
| 227 | } |
| 228 | |
Denis V. Lunev | 868d13a | 2008-01-10 03:18:25 -0800 | [diff] [blame] | 229 | static u32 fib6_rule_default_pref(struct fib_rules_ops *ops) |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 230 | { |
| 231 | return 0x3FFF; |
| 232 | } |
| 233 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 234 | static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule) |
| 235 | { |
| 236 | return nla_total_size(16) /* dst */ |
| 237 | + nla_total_size(16); /* src */ |
| 238 | } |
| 239 | |
Daniel Lezcano | eb5564b | 2008-03-03 23:32:30 -0800 | [diff] [blame] | 240 | static struct fib_rules_ops fib6_rules_ops_template = { |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 241 | .family = AF_INET6, |
| 242 | .rule_size = sizeof(struct fib6_rule), |
Thomas Graf | e1701c6 | 2007-03-24 12:46:02 -0700 | [diff] [blame] | 243 | .addr_size = sizeof(struct in6_addr), |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 244 | .action = fib6_rule_action, |
| 245 | .match = fib6_rule_match, |
| 246 | .configure = fib6_rule_configure, |
| 247 | .compare = fib6_rule_compare, |
| 248 | .fill = fib6_rule_fill, |
| 249 | .default_pref = fib6_rule_default_pref, |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 250 | .nlmsg_payload = fib6_rule_nlmsg_payload, |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 251 | .nlgroup = RTNLGRP_IPV6_RULE, |
| 252 | .policy = fib6_rule_policy, |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 253 | .owner = THIS_MODULE, |
Denis V. Lunev | 03592383 | 2008-01-20 16:46:01 -0800 | [diff] [blame] | 254 | .fro_net = &init_net, |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 255 | }; |
| 256 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 257 | static int __net_init fib6_rules_net_init(struct net *net) |
Denis V. Lunev | 2994c63 | 2007-11-10 22:12:03 -0800 | [diff] [blame] | 258 | { |
Eric W. Biederman | e9c5158 | 2009-12-03 12:22:55 -0800 | [diff] [blame] | 259 | struct fib_rules_ops *ops; |
Daniel Lezcano | dcabb81 | 2008-03-03 23:33:08 -0800 | [diff] [blame] | 260 | int err = -ENOMEM; |
Denis V. Lunev | 2994c63 | 2007-11-10 22:12:03 -0800 | [diff] [blame] | 261 | |
Eric W. Biederman | e9c5158 | 2009-12-03 12:22:55 -0800 | [diff] [blame] | 262 | ops = fib_rules_register(&fib6_rules_ops_template, net); |
| 263 | if (IS_ERR(ops)) |
| 264 | return PTR_ERR(ops); |
| 265 | net->ipv6.fib6_rules_ops = ops; |
Daniel Lezcano | 9eb87f3 | 2007-12-07 00:42:52 -0800 | [diff] [blame] | 266 | |
Daniel Lezcano | 9eb87f3 | 2007-12-07 00:42:52 -0800 | [diff] [blame] | 267 | |
Daniel Lezcano | dcabb81 | 2008-03-03 23:33:08 -0800 | [diff] [blame] | 268 | err = fib_default_rule_add(net->ipv6.fib6_rules_ops, 0, |
Patrick McHardy | 5adef18 | 2009-12-03 01:25:57 +0000 | [diff] [blame] | 269 | RT6_TABLE_LOCAL, 0); |
Daniel Lezcano | dcabb81 | 2008-03-03 23:33:08 -0800 | [diff] [blame] | 270 | if (err) |
| 271 | goto out_fib6_rules_ops; |
| 272 | |
| 273 | err = fib_default_rule_add(net->ipv6.fib6_rules_ops, |
| 274 | 0x7FFE, RT6_TABLE_MAIN, 0); |
| 275 | if (err) |
Eric W. Biederman | e9c5158 | 2009-12-03 12:22:55 -0800 | [diff] [blame] | 276 | goto out_fib6_rules_ops; |
Daniel Lezcano | dcabb81 | 2008-03-03 23:33:08 -0800 | [diff] [blame] | 277 | |
Daniel Lezcano | dcabb81 | 2008-03-03 23:33:08 -0800 | [diff] [blame] | 278 | out: |
| 279 | return err; |
| 280 | |
Daniel Lezcano | dcabb81 | 2008-03-03 23:33:08 -0800 | [diff] [blame] | 281 | out_fib6_rules_ops: |
Eric W. Biederman | e9c5158 | 2009-12-03 12:22:55 -0800 | [diff] [blame] | 282 | fib_rules_unregister(ops); |
Daniel Lezcano | 9eb87f3 | 2007-12-07 00:42:52 -0800 | [diff] [blame] | 283 | goto out; |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 284 | } |
| 285 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 286 | static void __net_exit fib6_rules_net_exit(struct net *net) |
Daniel Lezcano | dcabb81 | 2008-03-03 23:33:08 -0800 | [diff] [blame] | 287 | { |
| 288 | fib_rules_unregister(net->ipv6.fib6_rules_ops); |
Daniel Lezcano | dcabb81 | 2008-03-03 23:33:08 -0800 | [diff] [blame] | 289 | } |
| 290 | |
| 291 | static struct pernet_operations fib6_rules_net_ops = { |
| 292 | .init = fib6_rules_net_init, |
| 293 | .exit = fib6_rules_net_exit, |
| 294 | }; |
| 295 | |
| 296 | int __init fib6_rules_init(void) |
| 297 | { |
| 298 | return register_pernet_subsys(&fib6_rules_net_ops); |
| 299 | } |
| 300 | |
| 301 | |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 302 | void fib6_rules_cleanup(void) |
| 303 | { |
YOSHIFUJI Hideaki | ff4e1fb | 2008-04-10 15:41:28 +0900 | [diff] [blame] | 304 | unregister_pernet_subsys(&fib6_rules_net_ops); |
Thomas Graf | 101367c | 2006-08-04 03:39:02 -0700 | [diff] [blame] | 305 | } |