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