Release 4.11 net/core/fib_rules.c

/*
 * net/core/fib_rules.c         Generic Routing Rules
 *
 *      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>
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/module.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/fib_rules.h>
#include <net/ip_tunnels.h>


static const struct fib_kuid_range fib_kuid_range_unset = {
	KUIDT_INIT(0),
	KUIDT_INIT(~0),
};



int fib_default_rule_add(struct fib_rules_ops *ops,
			 u32 pref, u32 table, u32 flags)
{
	struct fib_rule *r;

	r = kzalloc(ops->rule_size, GFP_KERNEL);
	if (r == NULL)
		return -ENOMEM;

	atomic_set(&r->refcnt, 1);
	r->action = FR_ACT_TO_TBL;
	r->pref = pref;
	r->table = table;
	r->flags = flags;
	r->fr_net = ops->fro_net;
	r->uid_range = fib_kuid_range_unset;

	r->suppress_prefixlen = -1;
	r->suppress_ifgroup = -1;

	/* The lock is not required here, the list in unreacheable
         * at the moment this function is called */
	list_add_tail(&r->list, &ops->rules_list);
	return 0;
}
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6
4.84%
1
25.00%
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124
100.00%
4
100.00%


EXPORT_SYMBOL(fib_default_rule_add);



static u32 fib_default_rule_pref(struct fib_rules_ops *ops)
{
	struct list_head *pos;
	struct fib_rule *rule;

	if (!list_empty(&ops->rules_list)) {
		pos = ops->rules_list.next;
		if (pos->next != &ops->rules_list) {
			rule = list_entry(pos->next, struct fib_rule, list);
			if (rule->pref)
				return rule->pref - 1;
		}
	}

	return 0;
}

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2
100.00%

static void notify_rule_change(int event, struct fib_rule *rule,
			       struct fib_rules_ops *ops, struct nlmsghdr *nlh,
			       u32 pid);



static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
{
	struct fib_rules_ops *ops;

	rcu_read_lock();
	list_for_each_entry_rcu(ops, &net->rules_ops, list) {
		if (ops->family == family) {
			if (!try_module_get(ops->owner))
				ops = NULL;
			rcu_read_unlock();
			return ops;
		}
	}
	rcu_read_unlock();

	return NULL;
}

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1
50.00%
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70
100.00%
2
100.00%



static void rules_ops_put(struct fib_rules_ops *ops)
{
	if (ops)
		module_put(ops->owner);
}

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1
100.00%



static void flush_route_cache(struct fib_rules_ops *ops)
{
	if (ops->flush_cache)
		ops->flush_cache(ops);
}

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24
100.00%
2
100.00%



static int __fib_rules_register(struct fib_rules_ops *ops)
{
	int err = -EEXIST;
	struct fib_rules_ops *o;
	struct net *net;

	net = ops->fro_net;

	if (ops->rule_size < sizeof(struct fib_rule))
		return -EINVAL;

	if (ops->match == NULL || ops->configure == NULL ||
	    ops->compare == NULL || ops->fill == NULL ||
	    ops->action == NULL)
		return -EINVAL;

	spin_lock(&net->rules_mod_lock);
	list_for_each_entry(o, &net->rules_ops, list)
		if (ops->family == o->family)
			goto errout;

	list_add_tail_rcu(&ops->list, &net->rules_ops);
	err = 0;
errout:
	spin_unlock(&net->rules_mod_lock);

	return err;
}

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124
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18
12.50%
2
50.00%
Eric W. Biedermann
2
1.39%
1
25.00%
Total
144
100.00%
4
100.00%


struct fib_rules_ops *

fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
{
	struct fib_rules_ops *ops;
	int err;

	ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
	if (ops == NULL)
		return ERR_PTR(-ENOMEM);

	INIT_LIST_HEAD(&ops->rules_list);
	ops->fro_net = net;

	err = __fib_rules_register(ops);
	if (err) {
		kfree(ops);
		ops = ERR_PTR(err);
	}

	return ops;
}
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1
1.04%
1
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96
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(fib_rules_register);



static void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
{
	struct fib_rule *rule, *tmp;

	list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
		list_del_rcu(&rule->list);
		if (ops->delete)
			ops->delete(rule);
		fib_rule_put(rule);
	}
}

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Thomas Graf
41
71.93%
1
20.00%
David S. Miller
13
22.81%
1
20.00%
Stephen Hemminger
1
1.75%
1
20.00%
Denis V. Lunev
1
1.75%
1
20.00%
Daniel Lezcano
1
1.75%
1
20.00%
Total
57
100.00%
5
100.00%



void fib_rules_unregister(struct fib_rules_ops *ops)
{
	struct net *net = ops->fro_net;

	spin_lock(&net->rules_mod_lock);
	list_del_rcu(&ops->list);
	spin_unlock(&net->rules_mod_lock);

	fib_rules_cleanup_ops(ops);
	kfree_rcu(ops, rcu);
}
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Denis V. Lunev
18
32.73%
3
42.86%
Américo Wang
5
9.09%
1
14.29%
Eric W. Biedermann
4
7.27%
2
28.57%
Total
55
100.00%
7
100.00%


EXPORT_SYMBOL_GPL(fib_rules_unregister);



static int uid_range_set(struct fib_kuid_range *range)
{
	return uid_valid(range->start) && uid_valid(range->end);
}

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static struct fib_kuid_range nla_get_kuid_range(struct nlattr **tb)
{
	struct fib_rule_uid_range *in;
	struct fib_kuid_range out;

	in = (struct fib_rule_uid_range *)nla_data(tb[FRA_UID_RANGE]);

	out.start = make_kuid(current_user_ns(), in->start);
	out.end = make_kuid(current_user_ns(), in->end);

	return out;
}

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static int nla_put_uid_range(struct sk_buff *skb, struct fib_kuid_range *range)
{
	struct fib_rule_uid_range out = {
		from_kuid_munged(current_user_ns(), range->start),
		from_kuid_munged(current_user_ns(), range->end)
	};

	return nla_put(skb, FRA_UID_RANGE, sizeof(out), &out);
}

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static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
			  struct flowi *fl, int flags,
			  struct fib_lookup_arg *arg)
{
	int ret = 0;

	if (rule->iifindex && (rule->iifindex != fl->flowi_iif))
		goto out;

	if (rule->oifindex && (rule->oifindex != fl->flowi_oif))
		goto out;

	if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
		goto out;

	if (rule->tun_id && (rule->tun_id != fl->flowi_tun_key.tun_id))
		goto out;

	if (rule->l3mdev && !l3mdev_fib_rule_match(rule->fr_net, fl, arg))
		goto out;

	if (uid_lt(fl->flowi_uid, rule->uid_range.start) ||
	    uid_gt(fl->flowi_uid, rule->uid_range.end))
		goto out;

	ret = ops->match(rule, fl, flags);
out:
	return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
}

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31
16.06%
1
11.11%
David Ahern
26
13.47%
1
11.11%
Patrick McHardy
20
10.36%
2
22.22%
David S. Miller
3
1.55%
1
11.11%
Total
193
100.00%
9
100.00%



int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
		     int flags, struct fib_lookup_arg *arg)
{
	struct fib_rule *rule;
	int err;

	rcu_read_lock();

	list_for_each_entry_rcu(rule, &ops->rules_list, list) {
jumped:
		if (!fib_rule_match(rule, ops, fl, flags, arg))
			continue;

		if (rule->action == FR_ACT_GOTO) {
			struct fib_rule *target;

			target = rcu_dereference(rule->ctarget);
			if (target == NULL) {
				continue;
			} else {
				rule = target;
				goto jumped;
			}
		} else if (rule->action == FR_ACT_NOP)
			continue;
		else
			err = ops->action(rule, fl, flags, arg);

		if (!err && ops->suppress && ops->suppress(rule, arg))
			continue;

		if (err != -EAGAIN) {
			if ((arg->flags & FIB_LOOKUP_NOREF) ||
			    likely(atomic_inc_not_zero(&rule->refcnt))) {
				arg->rule = rule;
				goto out;
			}
			break;
		}
	}

	err = -ESRCH;
out:
	rcu_read_unlock();

	return err;
}
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2
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Stefan Tomanek
19
9.22%
1
10.00%
David Ahern
2
0.97%
1
10.00%
Denis V. Lunev
1
0.49%
1
10.00%
Steven Whitehouse
1
0.49%
1
10.00%
Total
206
100.00%
10
100.00%


EXPORT_SYMBOL_GPL(fib_rules_lookup);



static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb,
			    struct fib_rules_ops *ops)
{
	int err = -EINVAL;

	if (frh->src_len)
		if (tb[FRA_SRC] == NULL ||
		    frh->src_len > (ops->addr_size * 8) ||
		    nla_len(tb[FRA_SRC]) != ops->addr_size)
			goto errout;

	if (frh->dst_len)
		if (tb[FRA_DST] == NULL ||
		    frh->dst_len > (ops->addr_size * 8) ||
		    nla_len(tb[FRA_DST]) != ops->addr_size)
			goto errout;

	err = 0;
errout:
	return err;
}

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static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh,
		       struct nlattr **tb, struct fib_rule *rule)
{
	struct fib_rule *r;

	list_for_each_entry(r, &ops->rules_list, list) {
		if (r->action != rule->action)
			continue;

		if (r->table != rule->table)
			continue;

		if (r->pref != rule->pref)
			continue;

		if (memcmp(r->iifname, rule->iifname, IFNAMSIZ))
			continue;

		if (memcmp(r->oifname, rule->oifname, IFNAMSIZ))
			continue;

		if (r->mark != rule->mark)
			continue;

		if (r->mark_mask != rule->mark_mask)
			continue;

		if (r->tun_id != rule->tun_id)
			continue;

		if (r->fr_net != rule->fr_net)
			continue;

		if (r->l3mdev != rule->l3mdev)
			continue;

		if (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
		    !uid_eq(r->uid_range.end, rule->uid_range.end))
			continue;

		if (!ops->compare(r, frh, tb))
			continue;
		return 1;
	}
	return 0;
}

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218
100.00%
2
100.00%



int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh)
{
	struct net *net = sock_net(skb->sk);
	struct fib_rule_hdr *frh = nlmsg_data(nlh);
	struct fib_rules_ops *ops = NULL;
	struct fib_rule *rule, *r, *last = NULL;
	struct nlattr *tb[FRA_MAX+1];
	int err = -EINVAL, unresolved = 0;

	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
		goto errout;

	ops = lookup_rules_ops(net, frh->family);
	if (ops == NULL) {
		err = -EAFNOSUPPORT;
		goto errout;
	}

	err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
	if (err < 0)
		goto errout;

	err = validate_rulemsg(frh, tb, ops);
	if (err < 0)
		goto errout;

	rule = kzalloc(ops->rule_size, GFP_KERNEL);
	if (rule == NULL) {
		err = -ENOMEM;
		goto errout;
	}
	rule->fr_net = net;

	rule->pref = tb[FRA_PRIORITY] ? nla_get_u32(tb[FRA_PRIORITY])
	                              : fib_default_rule_pref(ops);

	if (tb[FRA_IIFNAME]) {
		struct net_device *dev;

		rule->iifindex = -1;
		nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
		dev = __dev_get_by_name(net, rule->iifname);
		if (dev)
			rule->iifindex = dev->ifindex;
	}

	if (tb[FRA_OIFNAME]) {
		struct net_device *dev;

		rule->oifindex = -1;
		nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
		dev = __dev_get_by_name(net, rule->oifname);
		if (dev)
			rule->oifindex = dev->ifindex;
	}

	if (tb[FRA_FWMARK]) {
		rule->mark = nla_get_u32(tb[FRA_FWMARK]);
		if (rule->mark)
			/* compatibility: if the mark value is non-zero all bits
                         * are compared unless a mask is explicitly specified.
                         */
			rule->mark_mask = 0xFFFFFFFF;
	}

	if (tb[FRA_FWMASK])
		rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);

	if (tb[FRA_TUN_ID])
		rule->tun_id = nla_get_be64(tb[FRA_TUN_ID]);

	if (tb[FRA_L3MDEV]) {
#ifdef CONFIG_NET_L3_MASTER_DEV
		rule->l3mdev = nla_get_u8(tb[FRA_L3MDEV]);
		if (rule->l3mdev != 1)
#endif
			goto errout_free;
	}

	rule->action = frh->action;
	rule->flags = frh->flags;
	rule->table = frh_get_table(frh, tb);
	if (tb[FRA_SUPPRESS_PREFIXLEN])
		rule->suppress_prefixlen = nla_get_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
	else
		rule->suppress_prefixlen = -1;

	if (tb[FRA_SUPPRESS_IFGROUP])
		rule->suppress_ifgroup = nla_get_u32(tb[FRA_SUPPRESS_IFGROUP]);
	else
		rule->suppress_ifgroup = -1;

	err = -EINVAL;
	if (tb[FRA_GOTO]) {
		if (rule->action != FR_ACT_GOTO)
			goto errout_free;

		rule->target = nla_get_u32(tb[FRA_GOTO]);
		/* Backward jumps are prohibited to avoid endless loops */
		if (rule->target <= rule->pref)
			goto errout_free;

		list_for_each_entry(r, &ops->rules_list, list) {
			if (r->pref == rule->target) {
				RCU_INIT_POINTER(rule->ctarget, r);
				break;
			}
		}

		if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
			unresolved = 1;
	} else if (rule->action == FR_ACT_GOTO)
		goto errout_free;

	if (rule->l3mdev && rule->table)
		goto errout_free;

	if (tb[FRA_UID_RANGE]) {
		if (current_user_ns() != net->user_ns) {
			err = -EPERM;
			goto errout_free;
		}

		rule->uid_range = nla_get_kuid_range(tb);

		if (!uid_range_set(&rule->uid_range) ||
		    !uid_lte(rule->uid_range.start, rule->uid_range.end))
			goto errout_free;
	} else {
		rule->uid_range = fib_kuid_range_unset;
	}

	if ((nlh->nlmsg_flags & NLM_F_EXCL) &&
	    rule_exists(ops, frh, tb, rule)) {
		err = -EEXIST;
		goto errout_free;
	}

	err = ops->configure(rule, skb, frh, tb);
	if (err < 0)
		goto errout_free;

	list_for_each_entry(r, &ops->rules_list, list) {
		if (r->pref > rule->pref)
			break;
		last = r;
	}

	fib_rule_get(rule);

	if (last)
		list_add_rcu(&rule->list, &last->list);
	else
		list_add_rcu(&rule->list, &ops->rules_list);

	if (ops->unresolved_rules) {
		/*
                 * There are unresolved goto rules in the list, check if
                 * any of them are pointing to this new rule.
                 */
		list_for_each_entry(r, &ops->rules_list, list) {
			if (r->action == FR_ACT_GOTO &&
			    r->target == rule->pref &&
			    rtnl_dereference(r->ctarget) == NULL) {
				rcu_assign_pointer(r->ctarget, rule);
				if (--ops->unresolved_rules == 0)
					break;
			}
		}
	}

	if (rule->action == FR_ACT_GOTO)
		ops->nr_goto_rules++;

	if (unresolved)
		ops->unresolved_rules++;

	if (rule->tun_id)
		ip_tunnel_need_metadata();

	notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid);
	flush_route_cache(ops);
	rules_ops_put(ops);
	return 0;

errout_free:
	kfree(rule);
errout:
	rules_ops_put(ops);
	return err;
}
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76
7.65%
1
3.57%
Patrick McHardy
70
7.04%
4
14.29%
Stefan Tomanek
52
5.23%
3
10.71%
David Ahern
50
5.03%
1
3.57%
Eric Dumazet
43
4.33%
2
7.14%
Mateusz Bajorski
31
3.12%
1
3.57%
Eric W. Biedermann
12
1.21%
2
7.14%
Denis V. Lunev
11
1.11%
3
10.71%
Phil Sutter
10
1.01%
1
3.57%
Gao Feng
4
0.40%
1
3.57%
Hideaki Yoshifuji / 吉藤英明
3
0.30%
1
3.57%
Total
994
100.00%
28
100.00%


EXPORT_SYMBOL_GPL(fib_nl_newrule);



int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh)
{
	struct net *net = sock_net(skb->sk);
	struct fib_rule_hdr *frh = nlmsg_data(nlh);
	struct fib_rules_ops *ops = NULL;
	struct fib_rule *rule, *tmp;
	struct nlattr *tb[FRA_MAX+1];
	struct fib_kuid_range range;
	int err = -EINVAL;

	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
		goto errout;

	ops = lookup_rules_ops(net, frh->family);
	if (ops == NULL) {
		err = -EAFNOSUPPORT;
		goto errout;
	}

	err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
	if (err < 0)
		goto errout;

	err = validate_rulemsg(frh, tb, ops);
	if (err < 0)
		goto errout;

	if (tb[FRA_UID_RANGE]) {
		range = nla_get_kuid_range(tb);
		if (!uid_range_set(&range))
			goto errout;
	} else {
		range = fib_kuid_range_unset;
	}

	list_for_each_entry(rule, &ops->rules_list, list) {
		if (frh->action && (frh->action != rule->action))
			continue;

		if (frh_get_table(frh, tb) &&
		    (frh_get_table(frh, tb) != rule->table))
			continue;

		if (tb[FRA_PRIORITY] &&
		    (rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
			continue;

		if (tb[FRA_IIFNAME] &&
		    nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
			continue;

		if (tb[FRA_OIFNAME] &&
		    nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
			continue;

		if (tb[FRA_FWMARK] &&
		    (rule->mark != nla_get_u32(tb[FRA_FWMARK])))
			continue;

		if (tb[FRA_FWMASK] &&
		    (rule->mark_mask != nla_get_u32(tb[