Release 4.14 net/ipv4/fib_rules.c

/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              IPv4 Forwarding Information Base: policy rules.
 *
 * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *              Thomas Graf <tgraf@suug.ch>
 *
 *              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; either version
 *              2 of the License, or (at your option) any later version.
 *
 * Fixes:
 *              Rani Assaf      :       local_rule cannot be deleted
 *              Marc Boucher    :       routing by fwmark
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/inetdevice.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <linux/export.h>
#include <net/ip.h>
#include <net/route.h>
#include <net/tcp.h>
#include <net/ip_fib.h>
#include <net/fib_rules.h>


struct fib4_rule {
	
struct fib_rule		common;
	
u8			dst_len;
	
u8			src_len;
	
u8			tos;
	
__be32			src;
	
__be32			srcmask;
	
__be32			dst;
	
__be32			dstmask;
#ifdef CONFIG_IP_ROUTE_CLASSID
	
u32			tclassid;
#endif
};



static bool fib4_rule_matchall(const struct fib_rule *rule)
{
	struct fib4_rule *r = container_of(rule, struct fib4_rule, common);

	if (r->dst_len || r->src_len || r->tos)
		return false;
	return fib_rule_matchall(rule);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ido Schimmel
50
100.00%
1
100.00%
Total
50
100.00%
1
100.00%



bool fib4_rule_default(const struct fib_rule *rule)
{
	if (!fib4_rule_matchall(rule) || rule->action != FR_ACT_TO_TBL ||
	    rule->l3mdev)
		return false;
	if (rule->table != RT_TABLE_LOCAL && rule->table != RT_TABLE_MAIN &&
	    rule->table != RT_TABLE_DEFAULT)
		return false;
	return true;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Ido Schimmel
58
100.00%
1
100.00%
Total
58
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(fib4_rule_default);



int fib4_rules_dump(struct net *net, struct notifier_block *nb)
{
	return fib_rules_dump(net, nb, AF_INET);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ido Schimmel
25
100.00%
1
100.00%
Total
25
100.00%
1
100.00%



unsigned int fib4_rules_seq_read(struct net *net)
{
	return fib_rules_seq_read(net, AF_INET);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ido Schimmel
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%



int __fib_lookup(struct net *net, struct flowi4 *flp,
		 struct fib_result *res, unsigned int flags)
{
	struct fib_lookup_arg arg = {
		.result = res,
		.flags = flags,
        };
	int err;

	/* update flow if oif or iif point to device enslaved to l3mdev */
	l3mdev_update_flow(net, flowi4_to_flowi(flp));

	err = fib_rules_lookup(net->ipv4.rules_ops, flowi4_to_flowi(flp), 0, &arg);
#ifdef CONFIG_IP_ROUTE_CLASSID
	if (arg.rule)
		res->tclassid = ((struct fib4_rule *)arg.rule)->tclassid;
	else
		res->tclassid = 0;
#endif

	if (err == -ESRCH)
		err = -ENETUNREACH;

	return err;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David S. Miller
33
26.40%
3
21.43%
Thomas Graf
24
19.20%
1
7.14%
Linus Torvalds (pre-git)
23
18.40%
3
21.43%
Panu Matilainen
12
9.60%
1
7.14%
David Ahern
11
8.80%
1
7.14%
Denis V. Lunev
10
8.00%
2
14.29%
Andy Gospodarek
5
4.00%
1
7.14%
Eric Dumazet
4
3.20%
1
7.14%
Robert Olsson
3
2.40%
1
7.14%
Total
125
100.00%
14
100.00%


EXPORT_SYMBOL_GPL(__fib_lookup);



static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp,
			    int flags, struct fib_lookup_arg *arg)
{
	int err = -EAGAIN;
	struct fib_table *tbl;
	u32 tb_id;

	switch (rule->action) {
	case FR_ACT_TO_TBL:
		break;

	case FR_ACT_UNREACHABLE:
		return -ENETUNREACH;

	case FR_ACT_PROHIBIT:
		return -EACCES;

	case FR_ACT_BLACKHOLE:
	default:
		return -EINVAL;
	}

	rcu_read_lock();

	tb_id = fib_rule_get_table(rule, arg);
	tbl = fib_get_table(rule->fr_net, tb_id);
	if (tbl)
		err = fib_table_lookup(tbl, &flp->u.ip4,
				       (struct fib_result *)arg->result,
				       arg->flags);

	rcu_read_unlock();
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
54
40.91%
3
20.00%
Thomas Graf
31
23.48%
1
6.67%
David Ahern
13
9.85%
1
6.67%
Alexander Duyck
11
8.33%
1
6.67%
Eric Dumazet
8
6.06%
2
13.33%
David S. Miller
8
6.06%
2
13.33%
Denis V. Lunev
4
3.03%
2
13.33%
Adrian Bunk
1
0.76%
1
6.67%
Robert Olsson
1
0.76%
1
6.67%
Stephen Hemminger
1
0.76%
1
6.67%
Total
132
100.00%
15
100.00%



static bool fib4_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
{
	struct fib_result *result = (struct fib_result *) arg->result;
	struct net_device *dev = NULL;

	if (result->fi)
		dev = result->fi->fib_dev;

	/* do not accept result if the route does
         * not meet the required prefix length
         */
	if (result->prefixlen <= 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:
	if (!(arg->flags & FIB_LOOKUP_NOREF))
		fib_info_put(result->fi);
	return true;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stefan Tomanek
114
100.00%
4
100.00%
Total
114
100.00%
4
100.00%



static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
{
	struct fib4_rule *r = (struct fib4_rule *) rule;
	struct flowi4 *fl4 = &fl->u.ip4;
	__be32 daddr = fl4->daddr;
	__be32 saddr = fl4->saddr;

	if (((saddr ^ r->src) & r->srcmask) ||
	    ((daddr ^ r->dst) & r->dstmask))
		return 0;

	if (r->tos && (r->tos != fl4->flowi4_tos))
		return 0;

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Graf
85
75.89%
1
25.00%
David S. Miller
18
16.07%
1
25.00%
Linus Torvalds (pre-git)
7
6.25%
1
25.00%
Al Viro
2
1.79%
1
25.00%
Total
112
100.00%
4
100.00%



static struct fib_table *fib_empty_table(struct net *net)
{
	u32 id;

	for (id = 1; id <= RT_TABLE_MAX; id++)
		if (!fib_get_table(net, id))
			return fib_new_table(net, id);
	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Graf
33
66.00%
1
16.67%
Denis V. Lunev
8
16.00%
1
16.67%
Patrick McHardy
5
10.00%
2
33.33%
Linus Torvalds (pre-git)
3
6.00%
1
16.67%
Ian Morris
1
2.00%
1
16.67%
Total
50
100.00%
6
100.00%


static const struct nla_policy fib4_rule_policy[FRA_MAX+1] = {
	FRA_GENERIC_POLICY,
	[FRA_FLOW]	= { .type = NLA_U32 },
};



static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
			       struct fib_rule_hdr *frh,
			       struct nlattr **tb)
{
	struct net *net = sock_net(skb->sk);
	int err = -EINVAL;
	struct fib4_rule *rule4 = (struct fib4_rule *) rule;

	if (frh->tos & ~IPTOS_TOS_MASK)
		goto errout;

	/* split local/main if they are not already split */
	err = fib_unmerge(net);
	if (err)
		goto errout;

	if (rule->table == RT_TABLE_UNSPEC && !rule->l3mdev) {
		if (rule->action == FR_ACT_TO_TBL) {
			struct fib_table *table;

			table = fib_empty_table(net);
			if (!table) {
				err = -ENOBUFS;
				goto errout;
			}

			rule->table = table->tb_id;
		}
	}

	if (frh->src_len)
		rule4->src = nla_get_in_addr(tb[FRA_SRC]);

	if (frh->dst_len)
		rule4->dst = nla_get_in_addr(tb[FRA_DST]);

#ifdef CONFIG_IP_ROUTE_CLASSID
	if (tb[FRA_FLOW]) {
		rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
		if (rule4->tclassid)
			net->ipv4.fib_num_tclassid_users++;
	}
#endif

	rule4->src_len = frh->src_len;
	rule4->srcmask = inet_make_mask(rule4->src_len);
	rule4->dst_len = frh->dst_len;
	rule4->dstmask = inet_make_mask(rule4->dst_len);
	rule4->tos = frh->tos;

	net->ipv4.fib_has_custom_rules = true;

	err = 0;
errout:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Graf
178
63.12%
2
13.33%
Linus Torvalds (pre-git)
40
14.18%
1
6.67%
David S. Miller
23
8.16%
2
13.33%
Alexander Duyck
15
5.32%
1
6.67%
Denis V. Lunev
12
4.26%
2
13.33%
David Ahern
5
1.77%
1
6.67%
Hideaki Yoshifuji / 吉藤英明
3
1.06%
1
6.67%
Jiri Benc
2
0.71%
1
6.67%
Linus Torvalds
1
0.35%
1
6.67%
Patrick McHardy
1
0.35%
1
6.67%
Jamal Hadi Salim
1
0.35%
1
6.67%
Ian Morris
1
0.35%
1
6.67%
Total
282
100.00%
15
100.00%



static int fib4_rule_delete(struct fib_rule *rule)
{
	struct net *net = rule->fr_net;
	int err;

	/* split local/main if they are not already split */
	err = fib_unmerge(net);
	if (err)
		goto errout;

#ifdef CONFIG_IP_ROUTE_CLASSID
	if (((struct fib4_rule *)rule)->tclassid)
		net->ipv4.fib_num_tclassid_users--;
#endif
	net->ipv4.fib_has_custom_rules = true;
errout:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David S. Miller
48
63.16%
2
66.67%
Alexander Duyck
28
36.84%
1
33.33%
Total
76
100.00%
3
100.00%



static int fib4_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
			     struct nlattr **tb)
{
	struct fib4_rule *rule4 = (struct fib4_rule *) rule;

	if (frh->src_len && (rule4->src_len != frh->src_len))
		return 0;

	if (frh->dst_len && (rule4->dst_len != frh->dst_len))
		return 0;

	if (frh->tos && (rule4->tos != frh->tos))
		return 0;

#ifdef CONFIG_IP_ROUTE_CLASSID
	if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW])))
		return 0;
#endif

	if (frh->src_len && (rule4->src != nla_get_in_addr(tb[FRA_SRC])))
		return 0;

	if (frh->dst_len && (rule4->dst != nla_get_in_addr(tb[FRA_DST])))
		return 0;

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Graf
130
76.92%
2
28.57%
Linus Torvalds (pre-git)
36
21.30%
3
42.86%
Jiri Benc
2
1.18%
1
14.29%
Patrick McHardy
1
0.59%
1
14.29%
Total
169
100.00%
7
100.00%



static int fib4_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
			  struct fib_rule_hdr *frh)
{
	struct fib4_rule *rule4 = (struct fib4_rule *) rule;

	frh->dst_len = rule4->dst_len;
	frh->src_len = rule4->src_len;
	frh->tos = rule4->tos;

	if ((rule4->dst_len &&
	     nla_put_in_addr(skb, FRA_DST, rule4->dst)) ||
	    (rule4->src_len &&
	     nla_put_in_addr(skb, FRA_SRC, rule4->src)))
		goto nla_put_failure;
#ifdef CONFIG_IP_ROUTE_CLASSID
	if (rule4->tclassid &&
	    nla_put_u32(skb, FRA_FLOW, rule4->tclassid))
		goto nla_put_failure;
#endif
	return 0;

nla_put_failure:
	return -ENOBUFS;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Graf
81
62.31%
1
20.00%
Patrick McHardy
30
23.08%
2
40.00%
David S. Miller
17
13.08%
1
20.00%
Jiri Benc
2
1.54%
1
20.00%
Total
130
100.00%
5
100.00%



static size_t fib4_rule_nlmsg_payload(struct fib_rule *rule)
{
	return nla_total_size(4) /* dst */
	       + nla_total_size(4) /* src */
	       + nla_total_size(4); /* flow */
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Graf
30
100.00%
1
100.00%
Total
30
100.00%
1
100.00%



static void fib4_rule_flush_cache(struct fib_rules_ops *ops)
{
	rt_cache_flush(ops->fro_net);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Graf
11
61.11%
1
50.00%
Denis V. Lunev
7
38.89%
1
50.00%
Total
18
100.00%
2
100.00%


static const struct fib_rules_ops __net_initconst fib4_rules_ops_template = {
	.family		= AF_INET,
	.rule_size	= sizeof(struct fib4_rule),
	.addr_size	= sizeof(u32),
	.action		= fib4_rule_action,
	.suppress	= fib4_rule_suppress,
	.match		= fib4_rule_match,
	.configure	= fib4_rule_configure,
	.delete		= fib4_rule_delete,
	.compare	= fib4_rule_compare,
	.fill		= fib4_rule_fill,
	.nlmsg_payload	= fib4_rule_nlmsg_payload,
	.flush_cache	= fib4_rule_flush_cache,
	.nlgroup	= RTNLGRP_IPV4_RULE,
	.policy		= fib4_rule_policy,
	.owner		= THIS_MODULE,
};



static int fib_default_rules_init(struct fib_rules_ops *ops)
{
	int err;

	err = fib_default_rule_add(ops, 0, RT_TABLE_LOCAL, 0);
	if (err < 0)
		return err;
	err = fib_default_rule_add(ops, 0x7FFE, RT_TABLE_MAIN, 0);
	if (err < 0)
		return err;
	err = fib_default_rule_add(ops, 0x7FFF, RT_TABLE_DEFAULT, 0);
	if (err < 0)
		return err;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Denis V. Lunev
72
86.75%
2
33.33%
Robert Olsson
7
8.43%
1
16.67%
Linus Torvalds (pre-git)
3
3.61%
2
33.33%
Patrick McHardy
1
1.20%
1
16.67%
Total
83
100.00%
6
100.00%



int __net_init fib4_rules_init(struct net *net)
{
	int err;
	struct fib_rules_ops *ops;

	ops = fib_rules_register(&fib4_rules_ops_template, net);
	if (IS_ERR(ops))
		return PTR_ERR(ops);

	err = fib_default_rules_init(ops);
	if (err < 0)
		goto fail;
	net->ipv4.rules_ops = ops;
	net->ipv4.fib_has_custom_rules = false;
	return 0;

fail:
	/* also cleans all rules already added */
	fib_rules_unregister(ops);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Denis V. Lunev
70
79.55%
4
57.14%
David S. Miller
8
9.09%
1
14.29%
Eric W. Biedermann
7
7.95%
1
14.29%
Thomas Graf
3
3.41%
1
14.29%
Total
88
100.00%
7
100.00%



void __net_exit fib4_rules_exit(struct net *net)
{
	fib_rules_unregister(net->ipv4.rules_ops);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Denis V. Lunev
20
100.00%
2
100.00%
Total
20
100.00%
2
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Graf
722
40.36%
5
7.69%
Linus Torvalds (pre-git)
215
12.02%
7
10.77%
Denis V. Lunev
204
11.40%
8
12.31%
David S. Miller
161
9.00%
7
10.77%
Ido Schimmel
157
8.78%
2
3.08%
Stefan Tomanek
119
6.65%
4
6.15%
Alexander Duyck
54
3.02%
2
3.08%
Patrick McHardy
42
2.35%
8
12.31%
David Ahern
29
1.62%
2
3.08%
Robert Olsson
17
0.95%
1
1.54%
Eric Dumazet
13
0.73%
2
3.08%
Panu Matilainen
12
0.67%
1
1.54%
Eric W. Biedermann
7
0.39%
1
1.54%
Al Viro
6
0.34%
1
1.54%
Jiri Benc
6
0.34%
2
3.08%
Andy Gospodarek
5
0.28%
1
1.54%
Florian Westphal
4
0.22%
1
1.54%
Hideaki Yoshifuji / 吉藤英明
3
0.17%
1
1.54%
Paul Gortmaker
3
0.17%
1
1.54%
Rusty Russell
2
0.11%
1
1.54%
Linus Torvalds
2
0.11%
2
3.08%
Ian Morris
2
0.11%
1
1.54%
Andi Kleen
1
0.06%
1
1.54%
Stephen Hemminger
1
0.06%
1
1.54%
Adrian Bunk
1
0.06%
1
1.54%
Jamal Hadi Salim
1
0.06%
1
1.54%
Total
1789
100.00%
65
100.00%
Directory: net/ipv4

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.