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1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * IPv4 Forwarding Information Base: policy rules.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 * Thomas Graf <tgraf@suug.ch>
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 *
16 * Fixes:
17 * Rani Assaf : local_rule cannot be deleted
18 * Marc Boucher : routing by fwmark
19 */
20
21#include <linux/types.h>
22#include <linux/kernel.h>
23#include <linux/netdevice.h>
24#include <linux/netlink.h>
25#include <linux/inetdevice.h>
26#include <linux/init.h>
27#include <linux/list.h>
28#include <linux/rcupdate.h>
29#include <linux/export.h>
30#include <net/ip.h>
31#include <net/route.h>
32#include <net/tcp.h>
33#include <net/ip_fib.h>
34#include <net/fib_rules.h>
35
36struct fib4_rule {
37 struct fib_rule common;
38 u8 dst_len;
39 u8 src_len;
40 u8 tos;
41 __be32 src;
42 __be32 srcmask;
43 __be32 dst;
44 __be32 dstmask;
45#ifdef CONFIG_IP_ROUTE_CLASSID
46 u32 tclassid;
47#endif
48};
49
50int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res)
51{
52 struct fib_lookup_arg arg = {
53 .result = res,
54 .flags = FIB_LOOKUP_NOREF,
55 };
56 int err;
57
58 err = fib_rules_lookup(net->ipv4.rules_ops, flowi4_to_flowi(flp), 0, &arg);
59#ifdef CONFIG_IP_ROUTE_CLASSID
60 if (arg.rule)
61 res->tclassid = ((struct fib4_rule *)arg.rule)->tclassid;
62 else
63 res->tclassid = 0;
64#endif
65 return err;
66}
67EXPORT_SYMBOL_GPL(__fib_lookup);
68
69static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp,
70 int flags, struct fib_lookup_arg *arg)
71{
72 int err = -EAGAIN;
73 struct fib_table *tbl;
74
75 switch (rule->action) {
76 case FR_ACT_TO_TBL:
77 break;
78
79 case FR_ACT_UNREACHABLE:
80 err = -ENETUNREACH;
81 goto errout;
82
83 case FR_ACT_PROHIBIT:
84 err = -EACCES;
85 goto errout;
86
87 case FR_ACT_BLACKHOLE:
88 default:
89 err = -EINVAL;
90 goto errout;
91 }
92
93 tbl = fib_get_table(rule->fr_net, rule->table);
94 if (!tbl)
95 goto errout;
96
97 err = fib_table_lookup(tbl, &flp->u.ip4, (struct fib_result *) arg->result, arg->flags);
98 if (err > 0)
99 err = -EAGAIN;
100errout:
101 return err;
102}
103
104static bool fib4_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
105{
106 struct fib_result *result = (struct fib_result *) arg->result;
107 struct net_device *dev = NULL;
108
109 if (result->fi)
110 dev = result->fi->fib_dev;
111
112 /* do not accept result if the route does
113 * not meet the required prefix length
114 */
115 if (result->prefixlen <= rule->suppress_prefixlen)
116 goto suppress_route;
117
118 /* do not accept result if the route uses a device
119 * belonging to a forbidden interface group
120 */
121 if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
122 goto suppress_route;
123
124 return false;
125
126suppress_route:
127 if (!(arg->flags & FIB_LOOKUP_NOREF))
128 fib_info_put(result->fi);
129 return true;
130}
131
132static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
133{
134 struct fib4_rule *r = (struct fib4_rule *) rule;
135 struct flowi4 *fl4 = &fl->u.ip4;
136 __be32 daddr = fl4->daddr;
137 __be32 saddr = fl4->saddr;
138
139 if (((saddr ^ r->src) & r->srcmask) ||
140 ((daddr ^ r->dst) & r->dstmask))
141 return 0;
142
143 if (r->tos && (r->tos != fl4->flowi4_tos))
144 return 0;
145
146 return 1;
147}
148
149static struct fib_table *fib_empty_table(struct net *net)
150{
151 u32 id;
152
153 for (id = 1; id <= RT_TABLE_MAX; id++)
154 if (fib_get_table(net, id) == NULL)
155 return fib_new_table(net, id);
156 return NULL;
157}
158
159static const struct nla_policy fib4_rule_policy[FRA_MAX+1] = {
160 FRA_GENERIC_POLICY,
161 [FRA_FLOW] = { .type = NLA_U32 },
162};
163
164static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
165 struct fib_rule_hdr *frh,
166 struct nlattr **tb)
167{
168 struct net *net = sock_net(skb->sk);
169 int err = -EINVAL;
170 struct fib4_rule *rule4 = (struct fib4_rule *) rule;
171
172 if (frh->tos & ~IPTOS_TOS_MASK)
173 goto errout;
174
175 if (rule->table == RT_TABLE_UNSPEC) {
176 if (rule->action == FR_ACT_TO_TBL) {
177 struct fib_table *table;
178
179 table = fib_empty_table(net);
180 if (table == NULL) {
181 err = -ENOBUFS;
182 goto errout;
183 }
184
185 rule->table = table->tb_id;
186 }
187 }
188
189 if (frh->src_len)
190 rule4->src = nla_get_be32(tb[FRA_SRC]);
191
192 if (frh->dst_len)
193 rule4->dst = nla_get_be32(tb[FRA_DST]);
194
195#ifdef CONFIG_IP_ROUTE_CLASSID
196 if (tb[FRA_FLOW]) {
197 rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
198 if (rule4->tclassid)
199 net->ipv4.fib_num_tclassid_users++;
200 }
201#endif
202
203 rule4->src_len = frh->src_len;
204 rule4->srcmask = inet_make_mask(rule4->src_len);
205 rule4->dst_len = frh->dst_len;
206 rule4->dstmask = inet_make_mask(rule4->dst_len);
207 rule4->tos = frh->tos;
208
209 net->ipv4.fib_has_custom_rules = true;
210 err = 0;
211errout:
212 return err;
213}
214
215static void fib4_rule_delete(struct fib_rule *rule)
216{
217 struct net *net = rule->fr_net;
218#ifdef CONFIG_IP_ROUTE_CLASSID
219 struct fib4_rule *rule4 = (struct fib4_rule *) rule;
220
221 if (rule4->tclassid)
222 net->ipv4.fib_num_tclassid_users--;
223#endif
224 net->ipv4.fib_has_custom_rules = true;
225}
226
227static int fib4_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
228 struct nlattr **tb)
229{
230 struct fib4_rule *rule4 = (struct fib4_rule *) rule;
231
232 if (frh->src_len && (rule4->src_len != frh->src_len))
233 return 0;
234
235 if (frh->dst_len && (rule4->dst_len != frh->dst_len))
236 return 0;
237
238 if (frh->tos && (rule4->tos != frh->tos))
239 return 0;
240
241#ifdef CONFIG_IP_ROUTE_CLASSID
242 if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW])))
243 return 0;
244#endif
245
246 if (frh->src_len && (rule4->src != nla_get_be32(tb[FRA_SRC])))
247 return 0;
248
249 if (frh->dst_len && (rule4->dst != nla_get_be32(tb[FRA_DST])))
250 return 0;
251
252 return 1;
253}
254
255static int fib4_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
256 struct fib_rule_hdr *frh)
257{
258 struct fib4_rule *rule4 = (struct fib4_rule *) rule;
259
260 frh->dst_len = rule4->dst_len;
261 frh->src_len = rule4->src_len;
262 frh->tos = rule4->tos;
263
264 if ((rule4->dst_len &&
265 nla_put_be32(skb, FRA_DST, rule4->dst)) ||
266 (rule4->src_len &&
267 nla_put_be32(skb, FRA_SRC, rule4->src)))
268 goto nla_put_failure;
269#ifdef CONFIG_IP_ROUTE_CLASSID
270 if (rule4->tclassid &&
271 nla_put_u32(skb, FRA_FLOW, rule4->tclassid))
272 goto nla_put_failure;
273#endif
274 return 0;
275
276nla_put_failure:
277 return -ENOBUFS;
278}
279
280static size_t fib4_rule_nlmsg_payload(struct fib_rule *rule)
281{
282 return nla_total_size(4) /* dst */
283 + nla_total_size(4) /* src */
284 + nla_total_size(4); /* flow */
285}
286
287static void fib4_rule_flush_cache(struct fib_rules_ops *ops)
288{
289 rt_cache_flush(ops->fro_net);
290}
291
292static const struct fib_rules_ops __net_initconst fib4_rules_ops_template = {
293 .family = AF_INET,
294 .rule_size = sizeof(struct fib4_rule),
295 .addr_size = sizeof(u32),
296 .action = fib4_rule_action,
297 .suppress = fib4_rule_suppress,
298 .match = fib4_rule_match,
299 .configure = fib4_rule_configure,
300 .delete = fib4_rule_delete,
301 .compare = fib4_rule_compare,
302 .fill = fib4_rule_fill,
303 .default_pref = fib_default_rule_pref,
304 .nlmsg_payload = fib4_rule_nlmsg_payload,
305 .flush_cache = fib4_rule_flush_cache,
306 .nlgroup = RTNLGRP_IPV4_RULE,
307 .policy = fib4_rule_policy,
308 .owner = THIS_MODULE,
309};
310
311static int fib_default_rules_init(struct fib_rules_ops *ops)
312{
313 int err;
314
315 err = fib_default_rule_add(ops, 0, RT_TABLE_LOCAL, 0);
316 if (err < 0)
317 return err;
318 err = fib_default_rule_add(ops, 0x7FFE, RT_TABLE_MAIN, 0);
319 if (err < 0)
320 return err;
321 err = fib_default_rule_add(ops, 0x7FFF, RT_TABLE_DEFAULT, 0);
322 if (err < 0)
323 return err;
324 return 0;
325}
326
327int __net_init fib4_rules_init(struct net *net)
328{
329 int err;
330 struct fib_rules_ops *ops;
331
332 ops = fib_rules_register(&fib4_rules_ops_template, net);
333 if (IS_ERR(ops))
334 return PTR_ERR(ops);
335
336 err = fib_default_rules_init(ops);
337 if (err < 0)
338 goto fail;
339 net->ipv4.rules_ops = ops;
340 net->ipv4.fib_has_custom_rules = false;
341 return 0;
342
343fail:
344 /* also cleans all rules already added */
345 fib_rules_unregister(ops);
346 return err;
347}
348
349void __net_exit fib4_rules_exit(struct net *net)
350{
351 fib_rules_unregister(net->ipv4.rules_ops);
352}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * IPv4 Forwarding Information Base: policy rules.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 * Thomas Graf <tgraf@suug.ch>
11 *
12 * Fixes:
13 * Rani Assaf : local_rule cannot be deleted
14 * Marc Boucher : routing by fwmark
15 */
16
17#include <linux/types.h>
18#include <linux/kernel.h>
19#include <linux/netdevice.h>
20#include <linux/netlink.h>
21#include <linux/inetdevice.h>
22#include <linux/init.h>
23#include <linux/list.h>
24#include <linux/rcupdate.h>
25#include <linux/export.h>
26#include <net/ip.h>
27#include <net/route.h>
28#include <net/tcp.h>
29#include <net/ip_fib.h>
30#include <net/nexthop.h>
31#include <net/fib_rules.h>
32#include <linux/indirect_call_wrapper.h>
33
34struct fib4_rule {
35 struct fib_rule common;
36 u8 dst_len;
37 u8 src_len;
38 u8 tos;
39 __be32 src;
40 __be32 srcmask;
41 __be32 dst;
42 __be32 dstmask;
43#ifdef CONFIG_IP_ROUTE_CLASSID
44 u32 tclassid;
45#endif
46};
47
48static bool fib4_rule_matchall(const struct fib_rule *rule)
49{
50 struct fib4_rule *r = container_of(rule, struct fib4_rule, common);
51
52 if (r->dst_len || r->src_len || r->tos)
53 return false;
54 return fib_rule_matchall(rule);
55}
56
57bool fib4_rule_default(const struct fib_rule *rule)
58{
59 if (!fib4_rule_matchall(rule) || rule->action != FR_ACT_TO_TBL ||
60 rule->l3mdev)
61 return false;
62 if (rule->table != RT_TABLE_LOCAL && rule->table != RT_TABLE_MAIN &&
63 rule->table != RT_TABLE_DEFAULT)
64 return false;
65 return true;
66}
67EXPORT_SYMBOL_GPL(fib4_rule_default);
68
69int fib4_rules_dump(struct net *net, struct notifier_block *nb,
70 struct netlink_ext_ack *extack)
71{
72 return fib_rules_dump(net, nb, AF_INET, extack);
73}
74
75unsigned int fib4_rules_seq_read(struct net *net)
76{
77 return fib_rules_seq_read(net, AF_INET);
78}
79
80int __fib_lookup(struct net *net, struct flowi4 *flp,
81 struct fib_result *res, unsigned int flags)
82{
83 struct fib_lookup_arg arg = {
84 .result = res,
85 .flags = flags,
86 };
87 int err;
88
89 /* update flow if oif or iif point to device enslaved to l3mdev */
90 l3mdev_update_flow(net, flowi4_to_flowi(flp));
91
92 err = fib_rules_lookup(net->ipv4.rules_ops, flowi4_to_flowi(flp), 0, &arg);
93#ifdef CONFIG_IP_ROUTE_CLASSID
94 if (arg.rule)
95 res->tclassid = ((struct fib4_rule *)arg.rule)->tclassid;
96 else
97 res->tclassid = 0;
98#endif
99
100 if (err == -ESRCH)
101 err = -ENETUNREACH;
102
103 return err;
104}
105EXPORT_SYMBOL_GPL(__fib_lookup);
106
107INDIRECT_CALLABLE_SCOPE int fib4_rule_action(struct fib_rule *rule,
108 struct flowi *flp, int flags,
109 struct fib_lookup_arg *arg)
110{
111 int err = -EAGAIN;
112 struct fib_table *tbl;
113 u32 tb_id;
114
115 switch (rule->action) {
116 case FR_ACT_TO_TBL:
117 break;
118
119 case FR_ACT_UNREACHABLE:
120 return -ENETUNREACH;
121
122 case FR_ACT_PROHIBIT:
123 return -EACCES;
124
125 case FR_ACT_BLACKHOLE:
126 default:
127 return -EINVAL;
128 }
129
130 rcu_read_lock();
131
132 tb_id = fib_rule_get_table(rule, arg);
133 tbl = fib_get_table(rule->fr_net, tb_id);
134 if (tbl)
135 err = fib_table_lookup(tbl, &flp->u.ip4,
136 (struct fib_result *)arg->result,
137 arg->flags);
138
139 rcu_read_unlock();
140 return err;
141}
142
143INDIRECT_CALLABLE_SCOPE bool fib4_rule_suppress(struct fib_rule *rule,
144 struct fib_lookup_arg *arg)
145{
146 struct fib_result *result = (struct fib_result *) arg->result;
147 struct net_device *dev = NULL;
148
149 if (result->fi) {
150 struct fib_nh_common *nhc = fib_info_nhc(result->fi, 0);
151
152 dev = nhc->nhc_dev;
153 }
154
155 /* do not accept result if the route does
156 * not meet the required prefix length
157 */
158 if (result->prefixlen <= rule->suppress_prefixlen)
159 goto suppress_route;
160
161 /* do not accept result if the route uses a device
162 * belonging to a forbidden interface group
163 */
164 if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
165 goto suppress_route;
166
167 return false;
168
169suppress_route:
170 if (!(arg->flags & FIB_LOOKUP_NOREF))
171 fib_info_put(result->fi);
172 return true;
173}
174
175INDIRECT_CALLABLE_SCOPE int fib4_rule_match(struct fib_rule *rule,
176 struct flowi *fl, int flags)
177{
178 struct fib4_rule *r = (struct fib4_rule *) rule;
179 struct flowi4 *fl4 = &fl->u.ip4;
180 __be32 daddr = fl4->daddr;
181 __be32 saddr = fl4->saddr;
182
183 if (((saddr ^ r->src) & r->srcmask) ||
184 ((daddr ^ r->dst) & r->dstmask))
185 return 0;
186
187 if (r->tos && (r->tos != fl4->flowi4_tos))
188 return 0;
189
190 if (rule->ip_proto && (rule->ip_proto != fl4->flowi4_proto))
191 return 0;
192
193 if (fib_rule_port_range_set(&rule->sport_range) &&
194 !fib_rule_port_inrange(&rule->sport_range, fl4->fl4_sport))
195 return 0;
196
197 if (fib_rule_port_range_set(&rule->dport_range) &&
198 !fib_rule_port_inrange(&rule->dport_range, fl4->fl4_dport))
199 return 0;
200
201 return 1;
202}
203
204static struct fib_table *fib_empty_table(struct net *net)
205{
206 u32 id = 1;
207
208 while (1) {
209 if (!fib_get_table(net, id))
210 return fib_new_table(net, id);
211
212 if (id++ == RT_TABLE_MAX)
213 break;
214 }
215 return NULL;
216}
217
218static const struct nla_policy fib4_rule_policy[FRA_MAX+1] = {
219 FRA_GENERIC_POLICY,
220 [FRA_FLOW] = { .type = NLA_U32 },
221};
222
223static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
224 struct fib_rule_hdr *frh,
225 struct nlattr **tb,
226 struct netlink_ext_ack *extack)
227{
228 struct net *net = sock_net(skb->sk);
229 int err = -EINVAL;
230 struct fib4_rule *rule4 = (struct fib4_rule *) rule;
231
232 if (frh->tos & ~IPTOS_TOS_MASK) {
233 NL_SET_ERR_MSG(extack, "Invalid tos");
234 goto errout;
235 }
236
237 /* split local/main if they are not already split */
238 err = fib_unmerge(net);
239 if (err)
240 goto errout;
241
242 if (rule->table == RT_TABLE_UNSPEC && !rule->l3mdev) {
243 if (rule->action == FR_ACT_TO_TBL) {
244 struct fib_table *table;
245
246 table = fib_empty_table(net);
247 if (!table) {
248 err = -ENOBUFS;
249 goto errout;
250 }
251
252 rule->table = table->tb_id;
253 }
254 }
255
256 if (frh->src_len)
257 rule4->src = nla_get_in_addr(tb[FRA_SRC]);
258
259 if (frh->dst_len)
260 rule4->dst = nla_get_in_addr(tb[FRA_DST]);
261
262#ifdef CONFIG_IP_ROUTE_CLASSID
263 if (tb[FRA_FLOW]) {
264 rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
265 if (rule4->tclassid)
266 net->ipv4.fib_num_tclassid_users++;
267 }
268#endif
269
270 if (fib_rule_requires_fldissect(rule))
271 net->ipv4.fib_rules_require_fldissect++;
272
273 rule4->src_len = frh->src_len;
274 rule4->srcmask = inet_make_mask(rule4->src_len);
275 rule4->dst_len = frh->dst_len;
276 rule4->dstmask = inet_make_mask(rule4->dst_len);
277 rule4->tos = frh->tos;
278
279 net->ipv4.fib_has_custom_rules = true;
280
281 err = 0;
282errout:
283 return err;
284}
285
286static int fib4_rule_delete(struct fib_rule *rule)
287{
288 struct net *net = rule->fr_net;
289 int err;
290
291 /* split local/main if they are not already split */
292 err = fib_unmerge(net);
293 if (err)
294 goto errout;
295
296#ifdef CONFIG_IP_ROUTE_CLASSID
297 if (((struct fib4_rule *)rule)->tclassid)
298 net->ipv4.fib_num_tclassid_users--;
299#endif
300 net->ipv4.fib_has_custom_rules = true;
301
302 if (net->ipv4.fib_rules_require_fldissect &&
303 fib_rule_requires_fldissect(rule))
304 net->ipv4.fib_rules_require_fldissect--;
305errout:
306 return err;
307}
308
309static int fib4_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
310 struct nlattr **tb)
311{
312 struct fib4_rule *rule4 = (struct fib4_rule *) rule;
313
314 if (frh->src_len && (rule4->src_len != frh->src_len))
315 return 0;
316
317 if (frh->dst_len && (rule4->dst_len != frh->dst_len))
318 return 0;
319
320 if (frh->tos && (rule4->tos != frh->tos))
321 return 0;
322
323#ifdef CONFIG_IP_ROUTE_CLASSID
324 if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW])))
325 return 0;
326#endif
327
328 if (frh->src_len && (rule4->src != nla_get_in_addr(tb[FRA_SRC])))
329 return 0;
330
331 if (frh->dst_len && (rule4->dst != nla_get_in_addr(tb[FRA_DST])))
332 return 0;
333
334 return 1;
335}
336
337static int fib4_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
338 struct fib_rule_hdr *frh)
339{
340 struct fib4_rule *rule4 = (struct fib4_rule *) rule;
341
342 frh->dst_len = rule4->dst_len;
343 frh->src_len = rule4->src_len;
344 frh->tos = rule4->tos;
345
346 if ((rule4->dst_len &&
347 nla_put_in_addr(skb, FRA_DST, rule4->dst)) ||
348 (rule4->src_len &&
349 nla_put_in_addr(skb, FRA_SRC, rule4->src)))
350 goto nla_put_failure;
351#ifdef CONFIG_IP_ROUTE_CLASSID
352 if (rule4->tclassid &&
353 nla_put_u32(skb, FRA_FLOW, rule4->tclassid))
354 goto nla_put_failure;
355#endif
356 return 0;
357
358nla_put_failure:
359 return -ENOBUFS;
360}
361
362static size_t fib4_rule_nlmsg_payload(struct fib_rule *rule)
363{
364 return nla_total_size(4) /* dst */
365 + nla_total_size(4) /* src */
366 + nla_total_size(4); /* flow */
367}
368
369static void fib4_rule_flush_cache(struct fib_rules_ops *ops)
370{
371 rt_cache_flush(ops->fro_net);
372}
373
374static const struct fib_rules_ops __net_initconst fib4_rules_ops_template = {
375 .family = AF_INET,
376 .rule_size = sizeof(struct fib4_rule),
377 .addr_size = sizeof(u32),
378 .action = fib4_rule_action,
379 .suppress = fib4_rule_suppress,
380 .match = fib4_rule_match,
381 .configure = fib4_rule_configure,
382 .delete = fib4_rule_delete,
383 .compare = fib4_rule_compare,
384 .fill = fib4_rule_fill,
385 .nlmsg_payload = fib4_rule_nlmsg_payload,
386 .flush_cache = fib4_rule_flush_cache,
387 .nlgroup = RTNLGRP_IPV4_RULE,
388 .policy = fib4_rule_policy,
389 .owner = THIS_MODULE,
390};
391
392static int fib_default_rules_init(struct fib_rules_ops *ops)
393{
394 int err;
395
396 err = fib_default_rule_add(ops, 0, RT_TABLE_LOCAL, 0);
397 if (err < 0)
398 return err;
399 err = fib_default_rule_add(ops, 0x7FFE, RT_TABLE_MAIN, 0);
400 if (err < 0)
401 return err;
402 err = fib_default_rule_add(ops, 0x7FFF, RT_TABLE_DEFAULT, 0);
403 if (err < 0)
404 return err;
405 return 0;
406}
407
408int __net_init fib4_rules_init(struct net *net)
409{
410 int err;
411 struct fib_rules_ops *ops;
412
413 ops = fib_rules_register(&fib4_rules_ops_template, net);
414 if (IS_ERR(ops))
415 return PTR_ERR(ops);
416
417 err = fib_default_rules_init(ops);
418 if (err < 0)
419 goto fail;
420 net->ipv4.rules_ops = ops;
421 net->ipv4.fib_has_custom_rules = false;
422 net->ipv4.fib_rules_require_fldissect = 0;
423 return 0;
424
425fail:
426 /* also cleans all rules already added */
427 fib_rules_unregister(ops);
428 return err;
429}
430
431void __net_exit fib4_rules_exit(struct net *net)
432{
433 fib_rules_unregister(net->ipv4.rules_ops);
434}