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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
18#include <net/fib_rules.h>
19#include <net/ipv6.h>
20#include <net/addrconf.h>
21#include <net/ip6_route.h>
22#include <net/netlink.h>
23
24struct fib6_rule
25{
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
59 switch (rule->action) {
60 case FR_ACT_TO_TBL:
61 break;
62 case FR_ACT_UNREACHABLE:
63 rt = net->ipv6.ip6_null_entry;
64 goto discard_pkt;
65 default:
66 case FR_ACT_BLACKHOLE:
67 rt = net->ipv6.ip6_blk_hole_entry;
68 goto discard_pkt;
69 case FR_ACT_PROHIBIT:
70 rt = net->ipv6.ip6_prohibit_entry;
71 goto discard_pkt;
72 }
73
74 table = fib6_get_table(net, rule->table);
75 if (table)
76 rt = lookup(net, table, flp6, flags);
77
78 if (rt != net->ipv6.ip6_null_entry) {
79 struct fib6_rule *r = (struct fib6_rule *)rule;
80
81 /*
82 * If we need to find a source address for this traffic,
83 * we check the result if it meets requirement of the rule.
84 */
85 if ((rule->flags & FIB_RULE_FIND_SADDR) &&
86 r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
87 struct in6_addr saddr;
88
89 if (ipv6_dev_get_saddr(net,
90 ip6_dst_idev(&rt->dst)->dev,
91 &flp6->daddr,
92 rt6_flags2srcprefs(flags),
93 &saddr))
94 goto again;
95 if (!ipv6_prefix_equal(&saddr, &r->src.addr,
96 r->src.plen))
97 goto again;
98 ipv6_addr_copy(&flp6->saddr, &saddr);
99 }
100 goto out;
101 }
102again:
103 dst_release(&rt->dst);
104 rt = NULL;
105 goto out;
106
107discard_pkt:
108 dst_hold(&rt->dst);
109out:
110 arg->result = rt;
111 return rt == NULL ? -EAGAIN : 0;
112}
113
114
115static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
116{
117 struct fib6_rule *r = (struct fib6_rule *) rule;
118 struct flowi6 *fl6 = &fl->u.ip6;
119
120 if (r->dst.plen &&
121 !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
122 return 0;
123
124 /*
125 * If FIB_RULE_FIND_SADDR is set and we do not have a
126 * source address for the traffic, we defer check for
127 * source address.
128 */
129 if (r->src.plen) {
130 if (flags & RT6_LOOKUP_F_HAS_SADDR) {
131 if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
132 r->src.plen))
133 return 0;
134 } else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
135 return 0;
136 }
137
138 if (r->tclass && r->tclass != ((ntohl(fl6->flowlabel) >> 20) & 0xff))
139 return 0;
140
141 return 1;
142}
143
144static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
145 FRA_GENERIC_POLICY,
146};
147
148static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
149 struct fib_rule_hdr *frh,
150 struct nlattr **tb)
151{
152 int err = -EINVAL;
153 struct net *net = sock_net(skb->sk);
154 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
155
156 if (rule->action == FR_ACT_TO_TBL) {
157 if (rule->table == RT6_TABLE_UNSPEC)
158 goto errout;
159
160 if (fib6_new_table(net, rule->table) == NULL) {
161 err = -ENOBUFS;
162 goto errout;
163 }
164 }
165
166 if (frh->src_len)
167 nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
168 sizeof(struct in6_addr));
169
170 if (frh->dst_len)
171 nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
172 sizeof(struct in6_addr));
173
174 rule6->src.plen = frh->src_len;
175 rule6->dst.plen = frh->dst_len;
176 rule6->tclass = frh->tos;
177
178 err = 0;
179errout:
180 return err;
181}
182
183static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
184 struct nlattr **tb)
185{
186 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
187
188 if (frh->src_len && (rule6->src.plen != frh->src_len))
189 return 0;
190
191 if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
192 return 0;
193
194 if (frh->tos && (rule6->tclass != frh->tos))
195 return 0;
196
197 if (frh->src_len &&
198 nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
199 return 0;
200
201 if (frh->dst_len &&
202 nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
203 return 0;
204
205 return 1;
206}
207
208static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
209 struct fib_rule_hdr *frh)
210{
211 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
212
213 frh->dst_len = rule6->dst.plen;
214 frh->src_len = rule6->src.plen;
215 frh->tos = rule6->tclass;
216
217 if (rule6->dst.plen)
218 NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr),
219 &rule6->dst.addr);
220
221 if (rule6->src.plen)
222 NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
223 &rule6->src.addr);
224
225 return 0;
226
227nla_put_failure:
228 return -ENOBUFS;
229}
230
231static u32 fib6_rule_default_pref(struct fib_rules_ops *ops)
232{
233 return 0x3FFF;
234}
235
236static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
237{
238 return nla_total_size(16) /* dst */
239 + nla_total_size(16); /* src */
240}
241
242static const struct fib_rules_ops __net_initdata fib6_rules_ops_template = {
243 .family = AF_INET6,
244 .rule_size = sizeof(struct fib6_rule),
245 .addr_size = sizeof(struct in6_addr),
246 .action = fib6_rule_action,
247 .match = fib6_rule_match,
248 .configure = fib6_rule_configure,
249 .compare = fib6_rule_compare,
250 .fill = fib6_rule_fill,
251 .default_pref = fib6_rule_default_pref,
252 .nlmsg_payload = fib6_rule_nlmsg_payload,
253 .nlgroup = RTNLGRP_IPV6_RULE,
254 .policy = fib6_rule_policy,
255 .owner = THIS_MODULE,
256 .fro_net = &init_net,
257};
258
259static int __net_init fib6_rules_net_init(struct net *net)
260{
261 struct fib_rules_ops *ops;
262 int err = -ENOMEM;
263
264 ops = fib_rules_register(&fib6_rules_ops_template, net);
265 if (IS_ERR(ops))
266 return PTR_ERR(ops);
267 net->ipv6.fib6_rules_ops = ops;
268
269
270 err = fib_default_rule_add(net->ipv6.fib6_rules_ops, 0,
271 RT6_TABLE_LOCAL, 0);
272 if (err)
273 goto out_fib6_rules_ops;
274
275 err = fib_default_rule_add(net->ipv6.fib6_rules_ops,
276 0x7FFE, RT6_TABLE_MAIN, 0);
277 if (err)
278 goto out_fib6_rules_ops;
279
280out:
281 return err;
282
283out_fib6_rules_ops:
284 fib_rules_unregister(ops);
285 goto out;
286}
287
288static void __net_exit fib6_rules_net_exit(struct net *net)
289{
290 fib_rules_unregister(net->ipv6.fib6_rules_ops);
291}
292
293static struct pernet_operations fib6_rules_net_ops = {
294 .init = fib6_rules_net_init,
295 .exit = fib6_rules_net_exit,
296};
297
298int __init fib6_rules_init(void)
299{
300 return register_pernet_subsys(&fib6_rules_net_ops);
301}
302
303
304void fib6_rules_cleanup(void)
305{
306 unregister_pernet_subsys(&fib6_rules_net_ops);
307}
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
17#include <net/fib_rules.h>
18#include <net/ipv6.h>
19#include <net/addrconf.h>
20#include <net/ip6_route.h>
21#include <net/netlink.h>
22
23struct fib6_rule {
24 struct fib_rule common;
25 struct rt6key src;
26 struct rt6key dst;
27 u8 tclass;
28};
29
30static bool fib6_rule_matchall(const struct fib_rule *rule)
31{
32 struct fib6_rule *r = container_of(rule, struct fib6_rule, common);
33
34 if (r->dst.plen || r->src.plen || r->tclass)
35 return false;
36 return fib_rule_matchall(rule);
37}
38
39bool fib6_rule_default(const struct fib_rule *rule)
40{
41 if (!fib6_rule_matchall(rule) || rule->action != FR_ACT_TO_TBL ||
42 rule->l3mdev)
43 return false;
44 if (rule->table != RT6_TABLE_LOCAL && rule->table != RT6_TABLE_MAIN)
45 return false;
46 return true;
47}
48EXPORT_SYMBOL_GPL(fib6_rule_default);
49
50int fib6_rules_dump(struct net *net, struct notifier_block *nb)
51{
52 return fib_rules_dump(net, nb, AF_INET6);
53}
54
55unsigned int fib6_rules_seq_read(struct net *net)
56{
57 return fib_rules_seq_read(net, AF_INET6);
58}
59
60/* called with rcu lock held; no reference taken on fib6_info */
61int fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
62 struct fib6_result *res, int flags)
63{
64 int err;
65
66 if (net->ipv6.fib6_has_custom_rules) {
67 struct fib_lookup_arg arg = {
68 .lookup_ptr = fib6_table_lookup,
69 .lookup_data = &oif,
70 .result = res,
71 .flags = FIB_LOOKUP_NOREF,
72 };
73
74 l3mdev_update_flow(net, flowi6_to_flowi(fl6));
75
76 err = fib_rules_lookup(net->ipv6.fib6_rules_ops,
77 flowi6_to_flowi(fl6), flags, &arg);
78 } else {
79 err = fib6_table_lookup(net, net->ipv6.fib6_local_tbl, oif,
80 fl6, res, flags);
81 if (err || res->f6i == net->ipv6.fib6_null_entry)
82 err = fib6_table_lookup(net, net->ipv6.fib6_main_tbl,
83 oif, fl6, res, flags);
84 }
85
86 return err;
87}
88
89struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
90 const struct sk_buff *skb,
91 int flags, pol_lookup_t lookup)
92{
93 if (net->ipv6.fib6_has_custom_rules) {
94 struct fib6_result res = {};
95 struct fib_lookup_arg arg = {
96 .lookup_ptr = lookup,
97 .lookup_data = skb,
98 .result = &res,
99 .flags = FIB_LOOKUP_NOREF,
100 };
101
102 /* update flow if oif or iif point to device enslaved to l3mdev */
103 l3mdev_update_flow(net, flowi6_to_flowi(fl6));
104
105 fib_rules_lookup(net->ipv6.fib6_rules_ops,
106 flowi6_to_flowi(fl6), flags, &arg);
107
108 if (res.rt6)
109 return &res.rt6->dst;
110 } else {
111 struct rt6_info *rt;
112
113 rt = lookup(net, net->ipv6.fib6_local_tbl, fl6, skb, flags);
114 if (rt != net->ipv6.ip6_null_entry && rt->dst.error != -EAGAIN)
115 return &rt->dst;
116 ip6_rt_put_flags(rt, flags);
117 rt = lookup(net, net->ipv6.fib6_main_tbl, fl6, skb, flags);
118 if (rt->dst.error != -EAGAIN)
119 return &rt->dst;
120 ip6_rt_put_flags(rt, flags);
121 }
122
123 if (!(flags & RT6_LOOKUP_F_DST_NOREF))
124 dst_hold(&net->ipv6.ip6_null_entry->dst);
125 return &net->ipv6.ip6_null_entry->dst;
126}
127
128static int fib6_rule_saddr(struct net *net, struct fib_rule *rule, int flags,
129 struct flowi6 *flp6, const struct net_device *dev)
130{
131 struct fib6_rule *r = (struct fib6_rule *)rule;
132
133 /* If we need to find a source address for this traffic,
134 * we check the result if it meets requirement of the rule.
135 */
136 if ((rule->flags & FIB_RULE_FIND_SADDR) &&
137 r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
138 struct in6_addr saddr;
139
140 if (ipv6_dev_get_saddr(net, dev, &flp6->daddr,
141 rt6_flags2srcprefs(flags), &saddr))
142 return -EAGAIN;
143
144 if (!ipv6_prefix_equal(&saddr, &r->src.addr, r->src.plen))
145 return -EAGAIN;
146
147 flp6->saddr = saddr;
148 }
149
150 return 0;
151}
152
153static int fib6_rule_action_alt(struct fib_rule *rule, struct flowi *flp,
154 int flags, struct fib_lookup_arg *arg)
155{
156 struct fib6_result *res = arg->result;
157 struct flowi6 *flp6 = &flp->u.ip6;
158 struct net *net = rule->fr_net;
159 struct fib6_table *table;
160 int err, *oif;
161 u32 tb_id;
162
163 switch (rule->action) {
164 case FR_ACT_TO_TBL:
165 break;
166 case FR_ACT_UNREACHABLE:
167 return -ENETUNREACH;
168 case FR_ACT_PROHIBIT:
169 return -EACCES;
170 case FR_ACT_BLACKHOLE:
171 default:
172 return -EINVAL;
173 }
174
175 tb_id = fib_rule_get_table(rule, arg);
176 table = fib6_get_table(net, tb_id);
177 if (!table)
178 return -EAGAIN;
179
180 oif = (int *)arg->lookup_data;
181 err = fib6_table_lookup(net, table, *oif, flp6, res, flags);
182 if (!err && res->f6i != net->ipv6.fib6_null_entry)
183 err = fib6_rule_saddr(net, rule, flags, flp6,
184 res->nh->fib_nh_dev);
185 else
186 err = -EAGAIN;
187
188 return err;
189}
190
191static int __fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
192 int flags, struct fib_lookup_arg *arg)
193{
194 struct fib6_result *res = arg->result;
195 struct flowi6 *flp6 = &flp->u.ip6;
196 struct rt6_info *rt = NULL;
197 struct fib6_table *table;
198 struct net *net = rule->fr_net;
199 pol_lookup_t lookup = arg->lookup_ptr;
200 int err = 0;
201 u32 tb_id;
202
203 switch (rule->action) {
204 case FR_ACT_TO_TBL:
205 break;
206 case FR_ACT_UNREACHABLE:
207 err = -ENETUNREACH;
208 rt = net->ipv6.ip6_null_entry;
209 goto discard_pkt;
210 default:
211 case FR_ACT_BLACKHOLE:
212 err = -EINVAL;
213 rt = net->ipv6.ip6_blk_hole_entry;
214 goto discard_pkt;
215 case FR_ACT_PROHIBIT:
216 err = -EACCES;
217 rt = net->ipv6.ip6_prohibit_entry;
218 goto discard_pkt;
219 }
220
221 tb_id = fib_rule_get_table(rule, arg);
222 table = fib6_get_table(net, tb_id);
223 if (!table) {
224 err = -EAGAIN;
225 goto out;
226 }
227
228 rt = lookup(net, table, flp6, arg->lookup_data, flags);
229 if (rt != net->ipv6.ip6_null_entry) {
230 err = fib6_rule_saddr(net, rule, flags, flp6,
231 ip6_dst_idev(&rt->dst)->dev);
232
233 if (err == -EAGAIN)
234 goto again;
235
236 err = rt->dst.error;
237 if (err != -EAGAIN)
238 goto out;
239 }
240again:
241 ip6_rt_put_flags(rt, flags);
242 err = -EAGAIN;
243 rt = NULL;
244 goto out;
245
246discard_pkt:
247 if (!(flags & RT6_LOOKUP_F_DST_NOREF))
248 dst_hold(&rt->dst);
249out:
250 res->rt6 = rt;
251 return err;
252}
253
254static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
255 int flags, struct fib_lookup_arg *arg)
256{
257 if (arg->lookup_ptr == fib6_table_lookup)
258 return fib6_rule_action_alt(rule, flp, flags, arg);
259
260 return __fib6_rule_action(rule, flp, flags, arg);
261}
262
263static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
264{
265 struct fib6_result *res = arg->result;
266 struct rt6_info *rt = res->rt6;
267 struct net_device *dev = NULL;
268
269 if (!rt)
270 return false;
271
272 if (rt->rt6i_idev)
273 dev = rt->rt6i_idev->dev;
274
275 /* do not accept result if the route does
276 * not meet the required prefix length
277 */
278 if (rt->rt6i_dst.plen <= rule->suppress_prefixlen)
279 goto suppress_route;
280
281 /* do not accept result if the route uses a device
282 * belonging to a forbidden interface group
283 */
284 if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
285 goto suppress_route;
286
287 return false;
288
289suppress_route:
290 if (!(arg->flags & FIB_LOOKUP_NOREF))
291 ip6_rt_put(rt);
292 return true;
293}
294
295static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
296{
297 struct fib6_rule *r = (struct fib6_rule *) rule;
298 struct flowi6 *fl6 = &fl->u.ip6;
299
300 if (r->dst.plen &&
301 !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
302 return 0;
303
304 /*
305 * If FIB_RULE_FIND_SADDR is set and we do not have a
306 * source address for the traffic, we defer check for
307 * source address.
308 */
309 if (r->src.plen) {
310 if (flags & RT6_LOOKUP_F_HAS_SADDR) {
311 if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
312 r->src.plen))
313 return 0;
314 } else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
315 return 0;
316 }
317
318 if (r->tclass && r->tclass != ip6_tclass(fl6->flowlabel))
319 return 0;
320
321 if (rule->ip_proto && (rule->ip_proto != fl6->flowi6_proto))
322 return 0;
323
324 if (fib_rule_port_range_set(&rule->sport_range) &&
325 !fib_rule_port_inrange(&rule->sport_range, fl6->fl6_sport))
326 return 0;
327
328 if (fib_rule_port_range_set(&rule->dport_range) &&
329 !fib_rule_port_inrange(&rule->dport_range, fl6->fl6_dport))
330 return 0;
331
332 return 1;
333}
334
335static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
336 FRA_GENERIC_POLICY,
337};
338
339static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
340 struct fib_rule_hdr *frh,
341 struct nlattr **tb,
342 struct netlink_ext_ack *extack)
343{
344 int err = -EINVAL;
345 struct net *net = sock_net(skb->sk);
346 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
347
348 if (rule->action == FR_ACT_TO_TBL && !rule->l3mdev) {
349 if (rule->table == RT6_TABLE_UNSPEC) {
350 NL_SET_ERR_MSG(extack, "Invalid table");
351 goto errout;
352 }
353
354 if (fib6_new_table(net, rule->table) == NULL) {
355 err = -ENOBUFS;
356 goto errout;
357 }
358 }
359
360 if (frh->src_len)
361 rule6->src.addr = nla_get_in6_addr(tb[FRA_SRC]);
362
363 if (frh->dst_len)
364 rule6->dst.addr = nla_get_in6_addr(tb[FRA_DST]);
365
366 rule6->src.plen = frh->src_len;
367 rule6->dst.plen = frh->dst_len;
368 rule6->tclass = frh->tos;
369
370 if (fib_rule_requires_fldissect(rule))
371 net->ipv6.fib6_rules_require_fldissect++;
372
373 net->ipv6.fib6_has_custom_rules = true;
374 err = 0;
375errout:
376 return err;
377}
378
379static int fib6_rule_delete(struct fib_rule *rule)
380{
381 struct net *net = rule->fr_net;
382
383 if (net->ipv6.fib6_rules_require_fldissect &&
384 fib_rule_requires_fldissect(rule))
385 net->ipv6.fib6_rules_require_fldissect--;
386
387 return 0;
388}
389
390static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
391 struct nlattr **tb)
392{
393 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
394
395 if (frh->src_len && (rule6->src.plen != frh->src_len))
396 return 0;
397
398 if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
399 return 0;
400
401 if (frh->tos && (rule6->tclass != frh->tos))
402 return 0;
403
404 if (frh->src_len &&
405 nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
406 return 0;
407
408 if (frh->dst_len &&
409 nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
410 return 0;
411
412 return 1;
413}
414
415static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
416 struct fib_rule_hdr *frh)
417{
418 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
419
420 frh->dst_len = rule6->dst.plen;
421 frh->src_len = rule6->src.plen;
422 frh->tos = rule6->tclass;
423
424 if ((rule6->dst.plen &&
425 nla_put_in6_addr(skb, FRA_DST, &rule6->dst.addr)) ||
426 (rule6->src.plen &&
427 nla_put_in6_addr(skb, FRA_SRC, &rule6->src.addr)))
428 goto nla_put_failure;
429 return 0;
430
431nla_put_failure:
432 return -ENOBUFS;
433}
434
435static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
436{
437 return nla_total_size(16) /* dst */
438 + nla_total_size(16); /* src */
439}
440
441static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = {
442 .family = AF_INET6,
443 .rule_size = sizeof(struct fib6_rule),
444 .addr_size = sizeof(struct in6_addr),
445 .action = fib6_rule_action,
446 .match = fib6_rule_match,
447 .suppress = fib6_rule_suppress,
448 .configure = fib6_rule_configure,
449 .delete = fib6_rule_delete,
450 .compare = fib6_rule_compare,
451 .fill = fib6_rule_fill,
452 .nlmsg_payload = fib6_rule_nlmsg_payload,
453 .nlgroup = RTNLGRP_IPV6_RULE,
454 .policy = fib6_rule_policy,
455 .owner = THIS_MODULE,
456 .fro_net = &init_net,
457};
458
459static int __net_init fib6_rules_net_init(struct net *net)
460{
461 struct fib_rules_ops *ops;
462 int err = -ENOMEM;
463
464 ops = fib_rules_register(&fib6_rules_ops_template, net);
465 if (IS_ERR(ops))
466 return PTR_ERR(ops);
467
468 err = fib_default_rule_add(ops, 0, RT6_TABLE_LOCAL, 0);
469 if (err)
470 goto out_fib6_rules_ops;
471
472 err = fib_default_rule_add(ops, 0x7FFE, RT6_TABLE_MAIN, 0);
473 if (err)
474 goto out_fib6_rules_ops;
475
476 net->ipv6.fib6_rules_ops = ops;
477 net->ipv6.fib6_rules_require_fldissect = 0;
478out:
479 return err;
480
481out_fib6_rules_ops:
482 fib_rules_unregister(ops);
483 goto out;
484}
485
486static void __net_exit fib6_rules_net_exit(struct net *net)
487{
488 rtnl_lock();
489 fib_rules_unregister(net->ipv6.fib6_rules_ops);
490 rtnl_unlock();
491}
492
493static struct pernet_operations fib6_rules_net_ops = {
494 .init = fib6_rules_net_init,
495 .exit = fib6_rules_net_exit,
496};
497
498int __init fib6_rules_init(void)
499{
500 return register_pernet_subsys(&fib6_rules_net_ops);
501}
502
503
504void fib6_rules_cleanup(void)
505{
506 unregister_pernet_subsys(&fib6_rules_net_ops);
507}