Linux Audio

Check our new training course

Loading...
v4.6
 
  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 rt6_info *rt;
 36	struct fib_lookup_arg arg = {
 37		.lookup_ptr = lookup,
 38		.flags = FIB_LOOKUP_NOREF,
 39	};
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 40
 41	fib_rules_lookup(net->ipv6.fib6_rules_ops,
 42			 flowi6_to_flowi(fl6), flags, &arg);
 
 
 43
 44	rt = arg.result;
 
 
 
 45
 46	if (!rt) {
 47		dst_hold(&net->ipv6.ip6_null_entry->dst);
 48		return &net->ipv6.ip6_null_entry->dst;
 
 
 
 
 
 
 
 
 
 
 
 
 49	}
 50
 51	if (rt->rt6i_flags & RTF_REJECT &&
 52	    rt->dst.error == -EAGAIN) {
 53		ip6_rt_put(rt);
 54		rt = net->ipv6.ip6_null_entry;
 55		dst_hold(&rt->dst);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 56	}
 57
 58	return &rt->dst;
 
 
 
 
 
 
 
 
 
 
 
 
 
 59}
 60
 61static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
 62			    int flags, struct fib_lookup_arg *arg)
 63{
 
 64	struct flowi6 *flp6 = &flp->u.ip6;
 65	struct rt6_info *rt = NULL;
 66	struct fib6_table *table;
 67	struct net *net = rule->fr_net;
 68	pol_lookup_t lookup = arg->lookup_ptr;
 69	int err = 0;
 
 70
 71	switch (rule->action) {
 72	case FR_ACT_TO_TBL:
 73		break;
 74	case FR_ACT_UNREACHABLE:
 75		err = -ENETUNREACH;
 76		rt = net->ipv6.ip6_null_entry;
 77		goto discard_pkt;
 78	default:
 79	case FR_ACT_BLACKHOLE:
 80		err = -EINVAL;
 81		rt = net->ipv6.ip6_blk_hole_entry;
 82		goto discard_pkt;
 83	case FR_ACT_PROHIBIT:
 84		err = -EACCES;
 85		rt = net->ipv6.ip6_prohibit_entry;
 86		goto discard_pkt;
 87	}
 88
 89	table = fib6_get_table(net, rule->table);
 
 90	if (!table) {
 91		err = -EAGAIN;
 92		goto out;
 93	}
 94
 95	rt = lookup(net, table, flp6, flags);
 
 96	if (rt != net->ipv6.ip6_null_entry) {
 97		struct fib6_rule *r = (struct fib6_rule *)rule;
 
 
 
 
 
 
 
 
 98
 99		/*
100		 * If we need to find a source address for this traffic,
101		 * we check the result if it meets requirement of the rule.
102		 */
103		if ((rule->flags & FIB_RULE_FIND_SADDR) &&
104		    r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
105			struct in6_addr saddr;
106
107			if (ipv6_dev_get_saddr(net,
108					       ip6_dst_idev(&rt->dst)->dev,
109					       &flp6->daddr,
110					       rt6_flags2srcprefs(flags),
111					       &saddr))
112				goto again;
113			if (!ipv6_prefix_equal(&saddr, &r->src.addr,
114					       r->src.plen))
115				goto again;
116			flp6->saddr = saddr;
117		}
118		err = rt->dst.error;
119		goto out;
 
120	}
121again:
122	ip6_rt_put(rt);
123	err = -EAGAIN;
124	rt = NULL;
125	goto out;
126
127discard_pkt:
128	dst_hold(&rt->dst);
 
129out:
130	arg->result = rt;
131	return err;
132}
133
134static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
 
 
 
 
 
 
 
 
 
 
 
 
135{
136	struct rt6_info *rt = (struct rt6_info *) arg->result;
 
137	struct net_device *dev = NULL;
138
 
 
 
139	if (rt->rt6i_idev)
140		dev = rt->rt6i_idev->dev;
141
142	/* do not accept result if the route does
143	 * not meet the required prefix length
144	 */
145	if (rt->rt6i_dst.plen <= rule->suppress_prefixlen)
146		goto suppress_route;
147
148	/* do not accept result if the route uses a device
149	 * belonging to a forbidden interface group
150	 */
151	if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
152		goto suppress_route;
153
154	return false;
155
156suppress_route:
157	ip6_rt_put(rt);
158	return true;
159}
160
161static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
 
162{
163	struct fib6_rule *r = (struct fib6_rule *) rule;
164	struct flowi6 *fl6 = &fl->u.ip6;
165
166	if (r->dst.plen &&
167	    !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
168		return 0;
169
170	/*
171	 * If FIB_RULE_FIND_SADDR is set and we do not have a
172	 * source address for the traffic, we defer check for
173	 * source address.
174	 */
175	if (r->src.plen) {
176		if (flags & RT6_LOOKUP_F_HAS_SADDR) {
177			if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
178					       r->src.plen))
179				return 0;
180		} else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
181			return 0;
182	}
183
184	if (r->tclass && r->tclass != ip6_tclass(fl6->flowlabel))
 
 
 
 
 
 
 
 
 
 
 
185		return 0;
186
187	return 1;
188}
189
190static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
191	FRA_GENERIC_POLICY,
192};
 
 
 
 
 
 
 
 
 
 
193
194static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
195			       struct fib_rule_hdr *frh,
196			       struct nlattr **tb)
 
197{
198	int err = -EINVAL;
199	struct net *net = sock_net(skb->sk);
200	struct fib6_rule *rule6 = (struct fib6_rule *) rule;
201
202	if (rule->action == FR_ACT_TO_TBL) {
203		if (rule->table == RT6_TABLE_UNSPEC)
 
 
 
 
 
 
 
 
 
 
 
204			goto errout;
 
205
206		if (fib6_new_table(net, rule->table) == NULL) {
207			err = -ENOBUFS;
208			goto errout;
209		}
210	}
211
212	if (frh->src_len)
213		rule6->src.addr = nla_get_in6_addr(tb[FRA_SRC]);
214
215	if (frh->dst_len)
216		rule6->dst.addr = nla_get_in6_addr(tb[FRA_DST]);
217
218	rule6->src.plen = frh->src_len;
219	rule6->dst.plen = frh->dst_len;
220	rule6->tclass = frh->tos;
221
 
 
 
 
222	err = 0;
223errout:
224	return err;
225}
226
 
 
 
 
 
 
 
 
 
 
 
227static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
228			     struct nlattr **tb)
229{
230	struct fib6_rule *rule6 = (struct fib6_rule *) rule;
231
232	if (frh->src_len && (rule6->src.plen != frh->src_len))
233		return 0;
234
235	if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
236		return 0;
237
238	if (frh->tos && (rule6->tclass != frh->tos))
 
 
239		return 0;
240
 
 
 
 
 
 
 
 
241	if (frh->src_len &&
242	    nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
243		return 0;
244
245	if (frh->dst_len &&
246	    nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
247		return 0;
248
249	return 1;
250}
251
252static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
253			  struct fib_rule_hdr *frh)
254{
255	struct fib6_rule *rule6 = (struct fib6_rule *) rule;
256
257	frh->dst_len = rule6->dst.plen;
258	frh->src_len = rule6->src.plen;
259	frh->tos = rule6->tclass;
 
 
 
 
 
 
 
 
260
261	if ((rule6->dst.plen &&
262	     nla_put_in6_addr(skb, FRA_DST, &rule6->dst.addr)) ||
263	    (rule6->src.plen &&
264	     nla_put_in6_addr(skb, FRA_SRC, &rule6->src.addr)))
265		goto nla_put_failure;
266	return 0;
267
268nla_put_failure:
269	return -ENOBUFS;
270}
271
272static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
273{
274	return nla_total_size(16) /* dst */
275	       + nla_total_size(16); /* src */
 
 
 
 
 
 
276}
277
278static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = {
279	.family			= AF_INET6,
280	.rule_size		= sizeof(struct fib6_rule),
281	.addr_size		= sizeof(struct in6_addr),
282	.action			= fib6_rule_action,
283	.match			= fib6_rule_match,
284	.suppress		= fib6_rule_suppress,
285	.configure		= fib6_rule_configure,
 
286	.compare		= fib6_rule_compare,
287	.fill			= fib6_rule_fill,
288	.nlmsg_payload		= fib6_rule_nlmsg_payload,
 
289	.nlgroup		= RTNLGRP_IPV6_RULE,
290	.policy			= fib6_rule_policy,
291	.owner			= THIS_MODULE,
292	.fro_net		= &init_net,
293};
294
295static int __net_init fib6_rules_net_init(struct net *net)
296{
297	struct fib_rules_ops *ops;
298	int err = -ENOMEM;
299
300	ops = fib_rules_register(&fib6_rules_ops_template, net);
301	if (IS_ERR(ops))
302		return PTR_ERR(ops);
303
304	err = fib_default_rule_add(ops, 0, RT6_TABLE_LOCAL, 0);
305	if (err)
306		goto out_fib6_rules_ops;
307
308	err = fib_default_rule_add(ops, 0x7FFE, RT6_TABLE_MAIN, 0);
309	if (err)
310		goto out_fib6_rules_ops;
311
312	net->ipv6.fib6_rules_ops = ops;
 
313out:
314	return err;
315
316out_fib6_rules_ops:
317	fib_rules_unregister(ops);
318	goto out;
319}
320
321static void __net_exit fib6_rules_net_exit(struct net *net)
322{
 
 
323	rtnl_lock();
324	fib_rules_unregister(net->ipv6.fib6_rules_ops);
 
 
 
325	rtnl_unlock();
326}
327
328static struct pernet_operations fib6_rules_net_ops = {
329	.init = fib6_rules_net_init,
330	.exit = fib6_rules_net_exit,
331};
332
333int __init fib6_rules_init(void)
334{
335	return register_pernet_subsys(&fib6_rules_net_ops);
336}
337
338
339void fib6_rules_cleanup(void)
340{
341	unregister_pernet_subsys(&fib6_rules_net_ops);
342}
v6.13.7
  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}