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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
16#include <linux/netdevice.h>
17#include <linux/export.h>
18
19#include <net/fib_rules.h>
20#include <net/ipv6.h>
21#include <net/addrconf.h>
22#include <net/ip6_route.h>
23#include <net/netlink.h>
24
25struct fib6_rule {
26 struct fib_rule common;
27 struct rt6key src;
28 struct rt6key dst;
29 u8 tclass;
30};
31
32struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
33 int flags, pol_lookup_t lookup)
34{
35 struct fib_lookup_arg arg = {
36 .lookup_ptr = lookup,
37 .flags = FIB_LOOKUP_NOREF,
38 };
39
40 fib_rules_lookup(net->ipv6.fib6_rules_ops,
41 flowi6_to_flowi(fl6), flags, &arg);
42
43 if (arg.result)
44 return arg.result;
45
46 dst_hold(&net->ipv6.ip6_null_entry->dst);
47 return &net->ipv6.ip6_null_entry->dst;
48}
49
50static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
51 int flags, struct fib_lookup_arg *arg)
52{
53 struct flowi6 *flp6 = &flp->u.ip6;
54 struct rt6_info *rt = NULL;
55 struct fib6_table *table;
56 struct net *net = rule->fr_net;
57 pol_lookup_t lookup = arg->lookup_ptr;
58 int err = 0;
59
60 switch (rule->action) {
61 case FR_ACT_TO_TBL:
62 break;
63 case FR_ACT_UNREACHABLE:
64 err = -ENETUNREACH;
65 rt = net->ipv6.ip6_null_entry;
66 goto discard_pkt;
67 default:
68 case FR_ACT_BLACKHOLE:
69 err = -EINVAL;
70 rt = net->ipv6.ip6_blk_hole_entry;
71 goto discard_pkt;
72 case FR_ACT_PROHIBIT:
73 err = -EACCES;
74 rt = net->ipv6.ip6_prohibit_entry;
75 goto discard_pkt;
76 }
77
78 table = fib6_get_table(net, rule->table);
79 if (!table) {
80 err = -EAGAIN;
81 goto out;
82 }
83
84 rt = lookup(net, table, flp6, flags);
85 if (rt != net->ipv6.ip6_null_entry) {
86 struct fib6_rule *r = (struct fib6_rule *)rule;
87
88 /*
89 * If we need to find a source address for this traffic,
90 * we check the result if it meets requirement of the rule.
91 */
92 if ((rule->flags & FIB_RULE_FIND_SADDR) &&
93 r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
94 struct in6_addr saddr;
95
96 if (ipv6_dev_get_saddr(net,
97 ip6_dst_idev(&rt->dst)->dev,
98 &flp6->daddr,
99 rt6_flags2srcprefs(flags),
100 &saddr))
101 goto again;
102 if (!ipv6_prefix_equal(&saddr, &r->src.addr,
103 r->src.plen))
104 goto again;
105 flp6->saddr = saddr;
106 }
107 goto out;
108 }
109again:
110 ip6_rt_put(rt);
111 err = -EAGAIN;
112 rt = NULL;
113 goto out;
114
115discard_pkt:
116 dst_hold(&rt->dst);
117out:
118 arg->result = rt;
119 return err;
120}
121
122static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
123{
124 struct rt6_info *rt = (struct rt6_info *) arg->result;
125 struct net_device *dev = NULL;
126
127 if (rt->rt6i_idev)
128 dev = rt->rt6i_idev->dev;
129
130 /* do not accept result if the route does
131 * not meet the required prefix length
132 */
133 if (rt->rt6i_dst.plen <= rule->suppress_prefixlen)
134 goto suppress_route;
135
136 /* do not accept result if the route uses a device
137 * belonging to a forbidden interface group
138 */
139 if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
140 goto suppress_route;
141
142 return false;
143
144suppress_route:
145 ip6_rt_put(rt);
146 return true;
147}
148
149static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
150{
151 struct fib6_rule *r = (struct fib6_rule *) rule;
152 struct flowi6 *fl6 = &fl->u.ip6;
153
154 if (r->dst.plen &&
155 !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
156 return 0;
157
158 /*
159 * If FIB_RULE_FIND_SADDR is set and we do not have a
160 * source address for the traffic, we defer check for
161 * source address.
162 */
163 if (r->src.plen) {
164 if (flags & RT6_LOOKUP_F_HAS_SADDR) {
165 if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
166 r->src.plen))
167 return 0;
168 } else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
169 return 0;
170 }
171
172 if (r->tclass && r->tclass != ip6_tclass(fl6->flowlabel))
173 return 0;
174
175 return 1;
176}
177
178static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
179 FRA_GENERIC_POLICY,
180};
181
182static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
183 struct fib_rule_hdr *frh,
184 struct nlattr **tb)
185{
186 int err = -EINVAL;
187 struct net *net = sock_net(skb->sk);
188 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
189
190 if (rule->action == FR_ACT_TO_TBL) {
191 if (rule->table == RT6_TABLE_UNSPEC)
192 goto errout;
193
194 if (fib6_new_table(net, rule->table) == NULL) {
195 err = -ENOBUFS;
196 goto errout;
197 }
198 }
199
200 if (frh->src_len)
201 nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
202 sizeof(struct in6_addr));
203
204 if (frh->dst_len)
205 nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
206 sizeof(struct in6_addr));
207
208 rule6->src.plen = frh->src_len;
209 rule6->dst.plen = frh->dst_len;
210 rule6->tclass = frh->tos;
211
212 err = 0;
213errout:
214 return err;
215}
216
217static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
218 struct nlattr **tb)
219{
220 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
221
222 if (frh->src_len && (rule6->src.plen != frh->src_len))
223 return 0;
224
225 if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
226 return 0;
227
228 if (frh->tos && (rule6->tclass != frh->tos))
229 return 0;
230
231 if (frh->src_len &&
232 nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
233 return 0;
234
235 if (frh->dst_len &&
236 nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
237 return 0;
238
239 return 1;
240}
241
242static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
243 struct fib_rule_hdr *frh)
244{
245 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
246
247 frh->dst_len = rule6->dst.plen;
248 frh->src_len = rule6->src.plen;
249 frh->tos = rule6->tclass;
250
251 if ((rule6->dst.plen &&
252 nla_put(skb, FRA_DST, sizeof(struct in6_addr),
253 &rule6->dst.addr)) ||
254 (rule6->src.plen &&
255 nla_put(skb, FRA_SRC, sizeof(struct in6_addr),
256 &rule6->src.addr)))
257 goto nla_put_failure;
258 return 0;
259
260nla_put_failure:
261 return -ENOBUFS;
262}
263
264static u32 fib6_rule_default_pref(struct fib_rules_ops *ops)
265{
266 return 0x3FFF;
267}
268
269static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
270{
271 return nla_total_size(16) /* dst */
272 + nla_total_size(16); /* src */
273}
274
275static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = {
276 .family = AF_INET6,
277 .rule_size = sizeof(struct fib6_rule),
278 .addr_size = sizeof(struct in6_addr),
279 .action = fib6_rule_action,
280 .match = fib6_rule_match,
281 .suppress = fib6_rule_suppress,
282 .configure = fib6_rule_configure,
283 .compare = fib6_rule_compare,
284 .fill = fib6_rule_fill,
285 .default_pref = fib6_rule_default_pref,
286 .nlmsg_payload = fib6_rule_nlmsg_payload,
287 .nlgroup = RTNLGRP_IPV6_RULE,
288 .policy = fib6_rule_policy,
289 .owner = THIS_MODULE,
290 .fro_net = &init_net,
291};
292
293static int __net_init fib6_rules_net_init(struct net *net)
294{
295 struct fib_rules_ops *ops;
296 int err = -ENOMEM;
297
298 ops = fib_rules_register(&fib6_rules_ops_template, net);
299 if (IS_ERR(ops))
300 return PTR_ERR(ops);
301 net->ipv6.fib6_rules_ops = ops;
302
303
304 err = fib_default_rule_add(net->ipv6.fib6_rules_ops, 0,
305 RT6_TABLE_LOCAL, 0);
306 if (err)
307 goto out_fib6_rules_ops;
308
309 err = fib_default_rule_add(net->ipv6.fib6_rules_ops,
310 0x7FFE, RT6_TABLE_MAIN, 0);
311 if (err)
312 goto out_fib6_rules_ops;
313
314out:
315 return err;
316
317out_fib6_rules_ops:
318 fib_rules_unregister(ops);
319 goto out;
320}
321
322static void __net_exit fib6_rules_net_exit(struct net *net)
323{
324 fib_rules_unregister(net->ipv6.fib6_rules_ops);
325}
326
327static struct pernet_operations fib6_rules_net_ops = {
328 .init = fib6_rules_net_init,
329 .exit = fib6_rules_net_exit,
330};
331
332int __init fib6_rules_init(void)
333{
334 return register_pernet_subsys(&fib6_rules_net_ops);
335}
336
337
338void fib6_rules_cleanup(void)
339{
340 unregister_pernet_subsys(&fib6_rules_net_ops);
341}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * net/ipv6/fib6_rules.c IPv6 Routing Policy Rules
4 *
5 * Copyright (C)2003-2006 Helsinki University of Technology
6 * Copyright (C)2003-2006 USAGI/WIDE Project
7 *
8 * Authors
9 * Thomas Graf <tgraf@suug.ch>
10 * Ville Nuorvala <vnuorval@tcs.hut.fi>
11 */
12
13#include <linux/netdevice.h>
14#include <linux/notifier.h>
15#include <linux/export.h>
16#include <linux/indirect_call_wrapper.h>
17
18#include <net/fib_rules.h>
19#include <net/inet_dscp.h>
20#include <net/ipv6.h>
21#include <net/addrconf.h>
22#include <net/ip6_route.h>
23#include <net/netlink.h>
24
25struct fib6_rule {
26 struct fib_rule common;
27 struct rt6key src;
28 struct rt6key dst;
29 dscp_t dscp;
30 u8 dscp_full:1; /* DSCP or TOS selector */
31};
32
33static bool fib6_rule_matchall(const struct fib_rule *rule)
34{
35 struct fib6_rule *r = container_of(rule, struct fib6_rule, common);
36
37 if (r->dst.plen || r->src.plen || r->dscp)
38 return false;
39 return fib_rule_matchall(rule);
40}
41
42bool fib6_rule_default(const struct fib_rule *rule)
43{
44 if (!fib6_rule_matchall(rule) || rule->action != FR_ACT_TO_TBL ||
45 rule->l3mdev)
46 return false;
47 if (rule->table != RT6_TABLE_LOCAL && rule->table != RT6_TABLE_MAIN)
48 return false;
49 return true;
50}
51EXPORT_SYMBOL_GPL(fib6_rule_default);
52
53int fib6_rules_dump(struct net *net, struct notifier_block *nb,
54 struct netlink_ext_ack *extack)
55{
56 return fib_rules_dump(net, nb, AF_INET6, extack);
57}
58
59unsigned int fib6_rules_seq_read(const struct net *net)
60{
61 return fib_rules_seq_read(net, AF_INET6);
62}
63
64/* called with rcu lock held; no reference taken on fib6_info */
65int fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
66 struct fib6_result *res, int flags)
67{
68 int err;
69
70 if (net->ipv6.fib6_has_custom_rules) {
71 struct fib_lookup_arg arg = {
72 .lookup_ptr = fib6_table_lookup,
73 .lookup_data = &oif,
74 .result = res,
75 .flags = FIB_LOOKUP_NOREF,
76 };
77
78 l3mdev_update_flow(net, flowi6_to_flowi(fl6));
79
80 err = fib_rules_lookup(net->ipv6.fib6_rules_ops,
81 flowi6_to_flowi(fl6), flags, &arg);
82 } else {
83 err = fib6_table_lookup(net, net->ipv6.fib6_local_tbl, oif,
84 fl6, res, flags);
85 if (err || res->f6i == net->ipv6.fib6_null_entry)
86 err = fib6_table_lookup(net, net->ipv6.fib6_main_tbl,
87 oif, fl6, res, flags);
88 }
89
90 return err;
91}
92
93struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
94 const struct sk_buff *skb,
95 int flags, pol_lookup_t lookup)
96{
97 if (net->ipv6.fib6_has_custom_rules) {
98 struct fib6_result res = {};
99 struct fib_lookup_arg arg = {
100 .lookup_ptr = lookup,
101 .lookup_data = skb,
102 .result = &res,
103 .flags = FIB_LOOKUP_NOREF,
104 };
105
106 /* update flow if oif or iif point to device enslaved to l3mdev */
107 l3mdev_update_flow(net, flowi6_to_flowi(fl6));
108
109 fib_rules_lookup(net->ipv6.fib6_rules_ops,
110 flowi6_to_flowi(fl6), flags, &arg);
111
112 if (res.rt6)
113 return &res.rt6->dst;
114 } else {
115 struct rt6_info *rt;
116
117 rt = pol_lookup_func(lookup,
118 net, net->ipv6.fib6_local_tbl, fl6, skb, flags);
119 if (rt != net->ipv6.ip6_null_entry && rt->dst.error != -EAGAIN)
120 return &rt->dst;
121 ip6_rt_put_flags(rt, flags);
122 rt = pol_lookup_func(lookup,
123 net, net->ipv6.fib6_main_tbl, fl6, skb, flags);
124 if (rt->dst.error != -EAGAIN)
125 return &rt->dst;
126 ip6_rt_put_flags(rt, flags);
127 }
128
129 if (!(flags & RT6_LOOKUP_F_DST_NOREF))
130 dst_hold(&net->ipv6.ip6_null_entry->dst);
131 return &net->ipv6.ip6_null_entry->dst;
132}
133
134static int fib6_rule_saddr(struct net *net, struct fib_rule *rule, int flags,
135 struct flowi6 *flp6, const struct net_device *dev)
136{
137 struct fib6_rule *r = (struct fib6_rule *)rule;
138
139 /* If we need to find a source address for this traffic,
140 * we check the result if it meets requirement of the rule.
141 */
142 if ((rule->flags & FIB_RULE_FIND_SADDR) &&
143 r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
144 struct in6_addr saddr;
145
146 if (ipv6_dev_get_saddr(net, dev, &flp6->daddr,
147 rt6_flags2srcprefs(flags), &saddr))
148 return -EAGAIN;
149
150 if (!ipv6_prefix_equal(&saddr, &r->src.addr, r->src.plen))
151 return -EAGAIN;
152
153 flp6->saddr = saddr;
154 }
155
156 return 0;
157}
158
159static int fib6_rule_action_alt(struct fib_rule *rule, struct flowi *flp,
160 int flags, struct fib_lookup_arg *arg)
161{
162 struct fib6_result *res = arg->result;
163 struct flowi6 *flp6 = &flp->u.ip6;
164 struct net *net = rule->fr_net;
165 struct fib6_table *table;
166 int err, *oif;
167 u32 tb_id;
168
169 switch (rule->action) {
170 case FR_ACT_TO_TBL:
171 break;
172 case FR_ACT_UNREACHABLE:
173 return -ENETUNREACH;
174 case FR_ACT_PROHIBIT:
175 return -EACCES;
176 case FR_ACT_BLACKHOLE:
177 default:
178 return -EINVAL;
179 }
180
181 tb_id = fib_rule_get_table(rule, arg);
182 table = fib6_get_table(net, tb_id);
183 if (!table)
184 return -EAGAIN;
185
186 oif = (int *)arg->lookup_data;
187 err = fib6_table_lookup(net, table, *oif, flp6, res, flags);
188 if (!err && res->f6i != net->ipv6.fib6_null_entry)
189 err = fib6_rule_saddr(net, rule, flags, flp6,
190 res->nh->fib_nh_dev);
191 else
192 err = -EAGAIN;
193
194 return err;
195}
196
197static int __fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
198 int flags, struct fib_lookup_arg *arg)
199{
200 struct fib6_result *res = arg->result;
201 struct flowi6 *flp6 = &flp->u.ip6;
202 struct rt6_info *rt = NULL;
203 struct fib6_table *table;
204 struct net *net = rule->fr_net;
205 pol_lookup_t lookup = arg->lookup_ptr;
206 int err = 0;
207 u32 tb_id;
208
209 switch (rule->action) {
210 case FR_ACT_TO_TBL:
211 break;
212 case FR_ACT_UNREACHABLE:
213 err = -ENETUNREACH;
214 rt = net->ipv6.ip6_null_entry;
215 goto discard_pkt;
216 default:
217 case FR_ACT_BLACKHOLE:
218 err = -EINVAL;
219 rt = net->ipv6.ip6_blk_hole_entry;
220 goto discard_pkt;
221 case FR_ACT_PROHIBIT:
222 err = -EACCES;
223 rt = net->ipv6.ip6_prohibit_entry;
224 goto discard_pkt;
225 }
226
227 tb_id = fib_rule_get_table(rule, arg);
228 table = fib6_get_table(net, tb_id);
229 if (!table) {
230 err = -EAGAIN;
231 goto out;
232 }
233
234 rt = pol_lookup_func(lookup,
235 net, table, flp6, arg->lookup_data, flags);
236 if (rt != net->ipv6.ip6_null_entry) {
237 struct inet6_dev *idev = ip6_dst_idev(&rt->dst);
238
239 if (!idev)
240 goto again;
241 err = fib6_rule_saddr(net, rule, flags, flp6,
242 idev->dev);
243
244 if (err == -EAGAIN)
245 goto again;
246
247 err = rt->dst.error;
248 if (err != -EAGAIN)
249 goto out;
250 }
251again:
252 ip6_rt_put_flags(rt, flags);
253 err = -EAGAIN;
254 rt = NULL;
255 goto out;
256
257discard_pkt:
258 if (!(flags & RT6_LOOKUP_F_DST_NOREF))
259 dst_hold(&rt->dst);
260out:
261 res->rt6 = rt;
262 return err;
263}
264
265INDIRECT_CALLABLE_SCOPE int fib6_rule_action(struct fib_rule *rule,
266 struct flowi *flp, int flags,
267 struct fib_lookup_arg *arg)
268{
269 if (arg->lookup_ptr == fib6_table_lookup)
270 return fib6_rule_action_alt(rule, flp, flags, arg);
271
272 return __fib6_rule_action(rule, flp, flags, arg);
273}
274
275INDIRECT_CALLABLE_SCOPE bool fib6_rule_suppress(struct fib_rule *rule,
276 int flags,
277 struct fib_lookup_arg *arg)
278{
279 struct fib6_result *res = arg->result;
280 struct rt6_info *rt = res->rt6;
281 struct net_device *dev = NULL;
282
283 if (!rt)
284 return false;
285
286 if (rt->rt6i_idev)
287 dev = rt->rt6i_idev->dev;
288
289 /* do not accept result if the route does
290 * not meet the required prefix length
291 */
292 if (rt->rt6i_dst.plen <= rule->suppress_prefixlen)
293 goto suppress_route;
294
295 /* do not accept result if the route uses a device
296 * belonging to a forbidden interface group
297 */
298 if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
299 goto suppress_route;
300
301 return false;
302
303suppress_route:
304 ip6_rt_put_flags(rt, flags);
305 return true;
306}
307
308INDIRECT_CALLABLE_SCOPE int fib6_rule_match(struct fib_rule *rule,
309 struct flowi *fl, int flags)
310{
311 struct fib6_rule *r = (struct fib6_rule *) rule;
312 struct flowi6 *fl6 = &fl->u.ip6;
313
314 if (r->dst.plen &&
315 !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
316 return 0;
317
318 /*
319 * If FIB_RULE_FIND_SADDR is set and we do not have a
320 * source address for the traffic, we defer check for
321 * source address.
322 */
323 if (r->src.plen) {
324 if (flags & RT6_LOOKUP_F_HAS_SADDR) {
325 if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
326 r->src.plen))
327 return 0;
328 } else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
329 return 0;
330 }
331
332 if (r->dscp && r->dscp != ip6_dscp(fl6->flowlabel))
333 return 0;
334
335 if (rule->ip_proto && (rule->ip_proto != fl6->flowi6_proto))
336 return 0;
337
338 if (fib_rule_port_range_set(&rule->sport_range) &&
339 !fib_rule_port_inrange(&rule->sport_range, fl6->fl6_sport))
340 return 0;
341
342 if (fib_rule_port_range_set(&rule->dport_range) &&
343 !fib_rule_port_inrange(&rule->dport_range, fl6->fl6_dport))
344 return 0;
345
346 return 1;
347}
348
349static int fib6_nl2rule_dscp(const struct nlattr *nla, struct fib6_rule *rule6,
350 struct netlink_ext_ack *extack)
351{
352 if (rule6->dscp) {
353 NL_SET_ERR_MSG(extack, "Cannot specify both TOS and DSCP");
354 return -EINVAL;
355 }
356
357 rule6->dscp = inet_dsfield_to_dscp(nla_get_u8(nla) << 2);
358 rule6->dscp_full = true;
359
360 return 0;
361}
362
363static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
364 struct fib_rule_hdr *frh,
365 struct nlattr **tb,
366 struct netlink_ext_ack *extack)
367{
368 int err = -EINVAL;
369 struct net *net = sock_net(skb->sk);
370 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
371
372 if (!inet_validate_dscp(frh->tos)) {
373 NL_SET_ERR_MSG(extack,
374 "Invalid dsfield (tos): ECN bits must be 0");
375 goto errout;
376 }
377 rule6->dscp = inet_dsfield_to_dscp(frh->tos);
378
379 if (tb[FRA_DSCP] && fib6_nl2rule_dscp(tb[FRA_DSCP], rule6, extack) < 0)
380 goto errout;
381
382 if (rule->action == FR_ACT_TO_TBL && !rule->l3mdev) {
383 if (rule->table == RT6_TABLE_UNSPEC) {
384 NL_SET_ERR_MSG(extack, "Invalid table");
385 goto errout;
386 }
387
388 if (fib6_new_table(net, rule->table) == NULL) {
389 err = -ENOBUFS;
390 goto errout;
391 }
392 }
393
394 if (frh->src_len)
395 rule6->src.addr = nla_get_in6_addr(tb[FRA_SRC]);
396
397 if (frh->dst_len)
398 rule6->dst.addr = nla_get_in6_addr(tb[FRA_DST]);
399
400 rule6->src.plen = frh->src_len;
401 rule6->dst.plen = frh->dst_len;
402
403 if (fib_rule_requires_fldissect(rule))
404 net->ipv6.fib6_rules_require_fldissect++;
405
406 net->ipv6.fib6_has_custom_rules = true;
407 err = 0;
408errout:
409 return err;
410}
411
412static int fib6_rule_delete(struct fib_rule *rule)
413{
414 struct net *net = rule->fr_net;
415
416 if (net->ipv6.fib6_rules_require_fldissect &&
417 fib_rule_requires_fldissect(rule))
418 net->ipv6.fib6_rules_require_fldissect--;
419
420 return 0;
421}
422
423static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
424 struct nlattr **tb)
425{
426 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
427
428 if (frh->src_len && (rule6->src.plen != frh->src_len))
429 return 0;
430
431 if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
432 return 0;
433
434 if (frh->tos &&
435 (rule6->dscp_full ||
436 inet_dscp_to_dsfield(rule6->dscp) != frh->tos))
437 return 0;
438
439 if (tb[FRA_DSCP]) {
440 dscp_t dscp;
441
442 dscp = inet_dsfield_to_dscp(nla_get_u8(tb[FRA_DSCP]) << 2);
443 if (!rule6->dscp_full || rule6->dscp != dscp)
444 return 0;
445 }
446
447 if (frh->src_len &&
448 nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
449 return 0;
450
451 if (frh->dst_len &&
452 nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
453 return 0;
454
455 return 1;
456}
457
458static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
459 struct fib_rule_hdr *frh)
460{
461 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
462
463 frh->dst_len = rule6->dst.plen;
464 frh->src_len = rule6->src.plen;
465
466 if (rule6->dscp_full) {
467 frh->tos = 0;
468 if (nla_put_u8(skb, FRA_DSCP,
469 inet_dscp_to_dsfield(rule6->dscp) >> 2))
470 goto nla_put_failure;
471 } else {
472 frh->tos = inet_dscp_to_dsfield(rule6->dscp);
473 }
474
475 if ((rule6->dst.plen &&
476 nla_put_in6_addr(skb, FRA_DST, &rule6->dst.addr)) ||
477 (rule6->src.plen &&
478 nla_put_in6_addr(skb, FRA_SRC, &rule6->src.addr)))
479 goto nla_put_failure;
480 return 0;
481
482nla_put_failure:
483 return -ENOBUFS;
484}
485
486static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
487{
488 return nla_total_size(16) /* dst */
489 + nla_total_size(16) /* src */
490 + nla_total_size(1); /* dscp */
491}
492
493static void fib6_rule_flush_cache(struct fib_rules_ops *ops)
494{
495 rt_genid_bump_ipv6(ops->fro_net);
496}
497
498static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = {
499 .family = AF_INET6,
500 .rule_size = sizeof(struct fib6_rule),
501 .addr_size = sizeof(struct in6_addr),
502 .action = fib6_rule_action,
503 .match = fib6_rule_match,
504 .suppress = fib6_rule_suppress,
505 .configure = fib6_rule_configure,
506 .delete = fib6_rule_delete,
507 .compare = fib6_rule_compare,
508 .fill = fib6_rule_fill,
509 .nlmsg_payload = fib6_rule_nlmsg_payload,
510 .flush_cache = fib6_rule_flush_cache,
511 .nlgroup = RTNLGRP_IPV6_RULE,
512 .owner = THIS_MODULE,
513 .fro_net = &init_net,
514};
515
516static int __net_init fib6_rules_net_init(struct net *net)
517{
518 struct fib_rules_ops *ops;
519 int err;
520
521 ops = fib_rules_register(&fib6_rules_ops_template, net);
522 if (IS_ERR(ops))
523 return PTR_ERR(ops);
524
525 err = fib_default_rule_add(ops, 0, RT6_TABLE_LOCAL);
526 if (err)
527 goto out_fib6_rules_ops;
528
529 err = fib_default_rule_add(ops, 0x7FFE, RT6_TABLE_MAIN);
530 if (err)
531 goto out_fib6_rules_ops;
532
533 net->ipv6.fib6_rules_ops = ops;
534 net->ipv6.fib6_rules_require_fldissect = 0;
535out:
536 return err;
537
538out_fib6_rules_ops:
539 fib_rules_unregister(ops);
540 goto out;
541}
542
543static void __net_exit fib6_rules_net_exit_batch(struct list_head *net_list)
544{
545 struct net *net;
546
547 rtnl_lock();
548 list_for_each_entry(net, net_list, exit_list) {
549 fib_rules_unregister(net->ipv6.fib6_rules_ops);
550 cond_resched();
551 }
552 rtnl_unlock();
553}
554
555static struct pernet_operations fib6_rules_net_ops = {
556 .init = fib6_rules_net_init,
557 .exit_batch = fib6_rules_net_exit_batch,
558};
559
560int __init fib6_rules_init(void)
561{
562 return register_pernet_subsys(&fib6_rules_net_ops);
563}
564
565
566void fib6_rules_cleanup(void)
567{
568 unregister_pernet_subsys(&fib6_rules_net_ops);
569}