Release 4.8 net/ipv6/fib6_rules.c

/*
 * net/ipv6/fib6_rules.c        IPv6 Routing Policy Rules
 *
 * Copyright (C)2003-2006 Helsinki University of Technology
 * Copyright (C)2003-2006 USAGI/WIDE Project
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License as
 *      published by the Free Software Foundation, version 2.
 *
 * Authors
 *      Thomas Graf             <tgraf@suug.ch>
 *      Ville Nuorvala          <vnuorval@tcs.hut.fi>
 */

#include <linux/netdevice.h>
#include <linux/export.h>

#include <net/fib_rules.h>
#include <net/ipv6.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <net/netlink.h>


struct fib6_rule {
	
struct fib_rule		common;
	
struct rt6key		src;
	
struct rt6key		dst;
	
u8			tclass;
};



struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
				   int flags, pol_lookup_t lookup)
{
	struct rt6_info *rt;
	struct fib_lookup_arg arg = {
		.lookup_ptr = lookup,
		.flags = FIB_LOOKUP_NOREF,
        };

	fib_rules_lookup(net->ipv6.fib6_rules_ops,
			 flowi6_to_flowi(fl6), flags, &arg);

	rt = arg.result;

	if (!rt) {
		dst_hold(&net->ipv6.ip6_null_entry->dst);
		return &net->ipv6.ip6_null_entry->dst;
	}

	if (rt->rt6i_flags & RTF_REJECT &&
	    rt->dst.error == -EAGAIN) {
		ip6_rt_put(rt);
		rt = net->ipv6.ip6_null_entry;
		dst_hold(&rt->dst);
	}

	return &rt->dst;
}

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thomas graf
thomas graf
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1
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daniel lezcano
daniel lezcano
19
13.19%
4
44.44%
ville nuorvala
ville nuorvala
14
9.72%
1
11.11%
david s. miller
david s. miller
6
4.17%
1
11.11%
eric dumazet
eric dumazet
5
3.47%
1
11.11%
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144
100.00%
9
100.00%



static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
			    int flags, struct fib_lookup_arg *arg)
{
	struct flowi6 *flp6 = &flp->u.ip6;
	struct rt6_info *rt = NULL;
	struct fib6_table *table;
	struct net *net = rule->fr_net;
	pol_lookup_t lookup = arg->lookup_ptr;
	int err = 0;
	u32 tb_id;

	switch (rule->action) {
	case FR_ACT_TO_TBL:
		break;
	case FR_ACT_UNREACHABLE:
		err = -ENETUNREACH;
		rt = net->ipv6.ip6_null_entry;
		goto discard_pkt;
	default:
	case FR_ACT_BLACKHOLE:
		err = -EINVAL;
		rt = net->ipv6.ip6_blk_hole_entry;
		goto discard_pkt;
	case FR_ACT_PROHIBIT:
		err = -EACCES;
		rt = net->ipv6.ip6_prohibit_entry;
		goto discard_pkt;
	}

	tb_id = fib_rule_get_table(rule, arg);
	table = fib6_get_table(net, tb_id);
	if (!table) {
		err = -EAGAIN;
		goto out;
	}

	rt = lookup(net, table, flp6, flags);
	if (rt != net->ipv6.ip6_null_entry) {
		struct fib6_rule *r = (struct fib6_rule *)rule;

		/*
                 * If we need to find a source address for this traffic,
                 * we check the result if it meets requirement of the rule.
                 */
		if ((rule->flags & FIB_RULE_FIND_SADDR) &&
		    r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
			struct in6_addr saddr;

			if (ipv6_dev_get_saddr(net,
					       ip6_dst_idev(&rt->dst)->dev,
					       &flp6->daddr,
					       rt6_flags2srcprefs(flags),
					       &saddr))
				goto again;
			if (!ipv6_prefix_equal(&saddr, &r->src.addr,
					       r->src.plen))
				goto again;
			flp6->saddr = saddr;
		}
		err = rt->dst.error;
		goto out;
	}
again:
	ip6_rt_put(rt);
	err = -EAGAIN;
	rt = NULL;
	goto out;

discard_pkt:
	dst_hold(&rt->dst);
out:
	arg->result = rt;
	return err;
}

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hideaki yoshifuji
103
28.85%
4
25.00%
hannes frederic sowa
hannes frederic sowa
37
10.36%
1
6.25%
daniel lezcano
daniel lezcano
29
8.12%
2
12.50%
david s. miller
david s. miller
17
4.76%
1
6.25%
david ahern
david ahern
13
3.64%
1
6.25%
steven barth
steven barth
8
2.24%
1
6.25%
patrick mchardy
patrick mchardy
7
1.96%
1
6.25%
brian haley
brian haley
2
0.56%
1
6.25%
adrian bunk
adrian bunk
1
0.28%
1
6.25%
americo wang
americo wang
1
0.28%
1
6.25%
alexey dobriyan
alexey dobriyan
1
0.28%
1
6.25%
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357
100.00%
16
100.00%



static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
{
	struct rt6_info *rt = (struct rt6_info *) arg->result;
	struct net_device *dev = NULL;

	if (rt->rt6i_idev)
		dev = rt->rt6i_idev->dev;

	/* do not accept result if the route does
         * not meet the required prefix length
         */
	if (rt->rt6i_dst.plen <= rule->suppress_prefixlen)
		goto suppress_route;

	/* do not accept result if the route uses a device
         * belonging to a forbidden interface group
         */
	if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
		goto suppress_route;

	return false;

suppress_route:
	ip6_rt_put(rt);
	return true;
}

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4
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static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
{
	struct fib6_rule *r = (struct fib6_rule *) rule;
	struct flowi6 *fl6 = &fl->u.ip6;

	if (r->dst.plen &&
	    !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
		return 0;

	/*
         * If FIB_RULE_FIND_SADDR is set and we do not have a
         * source address for the traffic, we defer check for
         * source address.
         */
	if (r->src.plen) {
		if (flags & RT6_LOOKUP_F_HAS_SADDR) {
			if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
					       r->src.plen))
				return 0;
		} else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
			return 0;
	}

	if (r->tclass && r->tclass != ip6_tclass(fl6->flowlabel))
		return 0;

	return 1;
}

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thomas graf
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hideaki yoshifuji
41
25.31%
3
42.86%
david s. miller
david s. miller
18
11.11%
1
14.29%
li rongqing
li rongqing
1
0.62%
1
14.29%
Total
162
100.00%
7
100.00%


static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
	FRA_GENERIC_POLICY,
};



static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
			       struct fib_rule_hdr *frh,
			       struct nlattr **tb)
{
	int err = -EINVAL;
	struct net *net = sock_net(skb->sk);
	struct fib6_rule *rule6 = (struct fib6_rule *) rule;

	if (rule->action == FR_ACT_TO_TBL && !rule->l3mdev) {
		if (rule->table == RT6_TABLE_UNSPEC)
			goto errout;

		if (fib6_new_table(net, rule->table) == NULL) {
			err = -ENOBUFS;
			goto errout;
		}
	}

	if (frh->src_len)
		rule6->src.addr = nla_get_in6_addr(tb[FRA_SRC]);

	if (frh->dst_len)
		rule6->dst.addr = nla_get_in6_addr(tb[FRA_DST]);

	rule6->src.plen = frh->src_len;
	rule6->dst.plen = frh->dst_len;
	rule6->tclass = frh->tos;

	err = 0;
errout:
	return err;
}

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thomas graf
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daniel lezcano
11
6.01%
2
28.57%
jiri benc
jiri benc
6
3.28%
1
14.29%
david ahern
david ahern
5
2.73%
1
14.29%
hideaki yoshifuji
hideaki yoshifuji
3
1.64%
1
14.29%
Total
183
100.00%
7
100.00%



static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
			     struct nlattr **tb)
{
	struct fib6_rule *rule6 = (struct fib6_rule *) rule;

	if (frh->src_len && (rule6->src.plen != frh->src_len))
		return 0;

	if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
		return 0;

	if (frh->tos && (rule6->tclass != frh->tos))
		return 0;

	if (frh->src_len &&
	    nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
		return 0;

	if (frh->dst_len &&
	    nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
		return 0;

	return 1;
}

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static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
			  struct fib_rule_hdr *frh)
{
	struct fib6_rule *rule6 = (struct fib6_rule *) rule;

	frh->dst_len = rule6->dst.plen;
	frh->src_len = rule6->src.plen;
	frh->tos = rule6->tclass;

	if ((rule6->dst.plen &&
	     nla_put_in6_addr(skb, FRA_DST, &rule6->dst.addr)) ||
	    (rule6->src.plen &&
	     nla_put_in6_addr(skb, FRA_SRC, &rule6->src.addr)))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -ENOBUFS;
}

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jiri benc
2
1.68%
1
33.33%
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119
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3
100.00%



static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
{
	return nla_total_size(16) /* dst */
	       + nla_total_size(16); /* src */
}

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static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = {
	.family			= AF_INET6,
	.rule_size		= sizeof(struct fib6_rule),
	.addr_size		= sizeof(struct in6_addr),
	.action			= fib6_rule_action,
	.match			= fib6_rule_match,
	.suppress		= fib6_rule_suppress,
	.configure		= fib6_rule_configure,
	.compare		= fib6_rule_compare,
	.fill			= fib6_rule_fill,
	.nlmsg_payload		= fib6_rule_nlmsg_payload,
	.nlgroup		= RTNLGRP_IPV6_RULE,
	.policy			= fib6_rule_policy,
	.owner			= THIS_MODULE,
	.fro_net		= &init_net,
};



static int __net_init fib6_rules_net_init(struct net *net)
{
	struct fib_rules_ops *ops;
	int err = -ENOMEM;

	ops = fib_rules_register(&fib6_rules_ops_template, net);
	if (IS_ERR(ops))
		return PTR_ERR(ops);

	err = fib_default_rule_add(ops, 0, RT6_TABLE_LOCAL, 0);
	if (err)
		goto out_fib6_rules_ops;

	err = fib_default_rule_add(ops, 0x7FFE, RT6_TABLE_MAIN, 0);
	if (err)
		goto out_fib6_rules_ops;

	net->ipv6.fib6_rules_ops = ops;
out:
	return err;

out_fib6_rules_ops:
	fib_rules_unregister(ops);
	goto out;
}

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denis v. lunev
31
28.44%
1
11.11%
eric w. biederman
eric w. biederman
19
17.43%
1
11.11%
americo wang
americo wang
10
9.17%
1
11.11%
thomas graf
thomas graf
8
7.34%
1
11.11%
patrick mchardy
patrick mchardy
1
0.92%
1
11.11%
alexey dobriyan
alexey dobriyan
1
0.92%
1
11.11%
Total
109
100.00%
9
100.00%



static void __net_exit fib6_rules_net_exit(struct net *net)
{
	rtnl_lock();
	fib_rules_unregister(net->ipv6.fib6_rules_ops);
	rtnl_unlock();
}

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25.93%
1
20.00%
americo wang
americo wang
6
22.22%
1
20.00%
alexey dobriyan
alexey dobriyan
1
3.70%
1
20.00%
Total
27
100.00%
5
100.00%


static struct pernet_operations fib6_rules_net_ops = {
	.init = fib6_rules_net_init,
	.exit = fib6_rules_net_exit,
};



int __init fib6_rules_init(void)
{
	return register_pernet_subsys(&fib6_rules_net_ops);
}


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void fib6_rules_cleanup(void)
{
	unregister_pernet_subsys(&fib6_rules_net_ops);
}
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daniel lezcano
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50.00%
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hideaki yoshifuji
1
7.69%
1
50.00%
Total
13
100.00%
2
100.00%

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thomas graf
863
54.76%
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9.62%
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daniel lezcano
156
9.90%
6
11.54%
hideaki yoshifuji
hideaki yoshifuji
152
9.64%
9
17.31%
stefan tomanek
stefan tomanek
108
6.85%
4
7.69%
lucien xin
lucien xin
60
3.81%
1
1.92%
david s. miller
david s. miller
52
3.30%
2
3.85%
denis v. lunev
denis v. lunev
37
2.35%
2
3.85%
hannes frederic sowa
hannes frederic sowa
37
2.35%
1
1.92%
eric w. biederman
eric w. biederman
19
1.21%
1
1.92%
david ahern
david ahern
18
1.14%
1
1.92%
americo wang
americo wang
17
1.08%
3
5.77%
ville nuorvala
ville nuorvala
14
0.89%
1
1.92%
patrick mchardy
patrick mchardy
11
0.70%
5
9.62%
steven barth
steven barth
8
0.51%
1
1.92%
jiri benc
jiri benc
8
0.51%
2
3.85%
eric dumazet
eric dumazet
5
0.32%
1
1.92%
paul gortmaker
paul gortmaker
3
0.19%
1
1.92%
alexey dobriyan
alexey dobriyan
3
0.19%
2
3.85%
brian haley
brian haley
2
0.13%
1
1.92%
adrian bunk
adrian bunk
1
0.06%
1
1.92%
li rongqing
li rongqing
1
0.06%
1
1.92%
andi kleen
andi kleen
1
0.06%
1
1.92%
Total
1576
100.00%
52
100.00%
  
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