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