Release 4.11 net/ipv4/fib_frontend.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: FIB frontend.
 *
 * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 *              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.
 */

#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/bitops.h>
#include <linux/capability.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/errno.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/inetdevice.h>
#include <linux/netdevice.h>
#include <linux/if_addr.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <linux/cache.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/slab.h>

#include <net/ip.h>
#include <net/protocol.h>
#include <net/route.h>
#include <net/tcp.h>
#include <net/sock.h>
#include <net/arp.h>
#include <net/ip_fib.h>
#include <net/rtnetlink.h>
#include <net/xfrm.h>
#include <net/l3mdev.h>
#include <net/lwtunnel.h>
#include <trace/events/fib.h>

#ifndef CONFIG_IP_MULTIPLE_TABLES



static int __net_init fib4_rules_init(struct net *net)
{
	struct fib_table *local_table, *main_table;

	main_table  = fib_trie_table(RT_TABLE_MAIN, NULL);
	if (!main_table)
		return -ENOMEM;

	local_table = fib_trie_table(RT_TABLE_LOCAL, main_table);
	if (!local_table)
		goto fail;

	hlist_add_head_rcu(&local_table->tb_hlist,
				&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]);
	hlist_add_head_rcu(&main_table->tb_hlist,
				&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]);
	return 0;

fail:
	fib_free_table(main_table);
	return -ENOMEM;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Denis V. Lunev
48
45.71%
4
40.00%
Pavel Emelyanov
34
32.38%
1
10.00%
Alexander Duyck
19
18.10%
3
30.00%
David S. Miller
2
1.90%
1
10.00%
Ian Morris
2
1.90%
1
10.00%
Total
105
100.00%
10
100.00%

#else



struct fib_table *fib_new_table(struct net *net, u32 id)
{
	struct fib_table *tb, *alias = NULL;
	unsigned int h;

	if (id == 0)
		id = RT_TABLE_MAIN;
	tb = fib_get_table(net, id);
	if (tb)
		return tb;

	if (id == RT_TABLE_LOCAL && !net->ipv4.fib_has_custom_rules)
		alias = fib_new_table(net, RT_TABLE_MAIN);

	tb = fib_trie_table(id, alias);
	if (!tb)
		return NULL;

	switch (id) {
	case RT_TABLE_MAIN:
		rcu_assign_pointer(net->ipv4.fib_main, tb);
		break;
	case RT_TABLE_DEFAULT:
		rcu_assign_pointer(net->ipv4.fib_default, tb);
		break;
	default:
		break;
	}

	h = id & (FIB_TABLE_HASHSZ - 1);
	hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]);
	return tb;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Patrick McHardy
56
34.36%
2
20.00%
Alexander Duyck
37
22.70%
3
30.00%
David S. Miller
31
19.02%
2
20.00%
Linus Torvalds (pre-git)
28
17.18%
1
10.00%
Denis V. Lunev
11
6.75%
2
20.00%
Total
163
100.00%
10
100.00%


EXPORT_SYMBOL_GPL(fib_new_table);

/* caller must hold either rtnl or rcu read lock */


struct fib_table *fib_get_table(struct net *net, u32 id)
{
	struct fib_table *tb;
	struct hlist_head *head;
	unsigned int h;

	if (id == 0)
		id = RT_TABLE_MAIN;
	h = id & (FIB_TABLE_HASHSZ - 1);

	head = &net->ipv4.fib_table_hash[h];
	hlist_for_each_entry_rcu(tb, head, tb_hlist) {
		if (tb->tb_id == id)
			return tb;
	}
	return NULL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Patrick McHardy
57
67.06%
1
25.00%
Denis V. Lunev
22
25.88%
2
50.00%
Linus Torvalds (pre-git)
6
7.06%
1
25.00%
Total
85
100.00%
4
100.00%

#endif /* CONFIG_IP_MULTIPLE_TABLES */



static void fib_replace_table(struct net *net, struct fib_table *old,
			      struct fib_table *new)
{
#ifdef CONFIG_IP_MULTIPLE_TABLES
	switch (new->tb_id) {
	case RT_TABLE_MAIN:
		rcu_assign_pointer(net->ipv4.fib_main, new);
		break;
	case RT_TABLE_DEFAULT:
		rcu_assign_pointer(net->ipv4.fib_default, new);
		break;
	default:
		break;
	}

#endif
	/* replace the old table in the hlist */
	hlist_replace_rcu(&old->tb_hlist, &new->tb_hlist);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Duyck
80
100.00%
1
100.00%
Total
80
100.00%
1
100.00%



int fib_unmerge(struct net *net)
{
	struct fib_table *old, *new, *main_table;

	/* attempt to fetch local table if it has been allocated */
	old = fib_get_table(net, RT_TABLE_LOCAL);
	if (!old)
		return 0;

	new = fib_trie_unmerge(old);
	if (!new)
		return -ENOMEM;

	/* table is already unmerged */
	if (new == old)
		return 0;

	/* replace merged table with clean table */
	fib_replace_table(net, old, new);
	fib_free_table(old);

	/* attempt to fetch main table if it has been allocated */
	main_table = fib_get_table(net, RT_TABLE_MAIN);
	if (!main_table)
		return 0;

	/* flush local entries from main table */
	fib_table_flush_external(main_table);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Duyck
107
100.00%
3
100.00%
Total
107
100.00%
3
100.00%



static void fib_flush(struct net *net)
{
	int flushed = 0;
	unsigned int h;

	for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
		struct hlist_head *head = &net->ipv4.fib_table_hash[h];
		struct hlist_node *tmp;
		struct fib_table *tb;

		hlist_for_each_entry_safe(tb, tmp, head, tb_hlist)
			flushed += fib_table_flush(net, tb);
	}

	if (flushed)
		rt_cache_flush(net);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
36
40.91%
1
12.50%
Alexander Duyck
18
20.45%
1
12.50%
Denis V. Lunev
16
18.18%
2
25.00%
Patrick McHardy
14
15.91%
1
12.50%
Jiri Pirko
2
2.27%
1
12.50%
Stephen Hemminger
1
1.14%
1
12.50%
Adrian Bunk
1
1.14%
1
12.50%
Total
88
100.00%
8
100.00%

/*
 * Find address type as if only "dev" was present in the system. If
 * on_dev is NULL then all interfaces are taken into consideration.
 */


static inline unsigned int __inet_dev_addr_type(struct net *net,
						const struct net_device *dev,
						__be32 addr, u32 tb_id)
{
	struct flowi4		fl4 = { .daddr = addr };
	struct fib_result	res;
	unsigned int ret = RTN_BROADCAST;
	struct fib_table *table;

	if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
		return RTN_BROADCAST;
	if (ipv4_is_multicast(addr))
		return RTN_MULTICAST;

	rcu_read_lock();

	table = fib_get_table(net, tb_id);
	if (table) {
		ret = RTN_UNICAST;
		if (!fib_table_lookup(table, &fl4, &res, FIB_LOOKUP_NOREF)) {
			if (!dev || dev == res.fi->fib_dev)
				ret = res.type;
		}
	}

	rcu_read_unlock();
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
68
48.23%
2
11.11%
Tóth László Attila
22
15.60%
1
5.56%
David S. Miller
10
7.09%
2
11.11%
Pavel Emelyanov
9
6.38%
1
5.56%
David Ahern
8
5.67%
2
11.11%
Eric Dumazet
7
4.96%
2
11.11%
Eric W. Biedermann
6
4.26%
1
5.56%
Alexander Duyck
4
2.84%
1
5.56%
Joe Perches
2
1.42%
1
5.56%
Al Viro
1
0.71%
1
5.56%
Arnaldo Carvalho de Melo
1
0.71%
1
5.56%
Stephen Hemminger
1
0.71%
1
5.56%
Jan Engelhardt
1
0.71%
1
5.56%
Denis V. Lunev
1
0.71%
1
5.56%
Total
141
100.00%
18
100.00%



unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id)
{
	return __inet_dev_addr_type(net, NULL, addr, tb_id);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Ahern
29
100.00%
2
100.00%
Total
29
100.00%
2
100.00%


EXPORT_SYMBOL(inet_addr_type_table);



unsigned int inet_addr_type(struct net *net, __be32 addr)
{
	return __inet_dev_addr_type(net, NULL, addr, RT_TABLE_LOCAL);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Tóth László Attila
17
65.38%
1
33.33%
Eric W. Biedermann
7
26.92%
1
33.33%
David Ahern
2
7.69%
1
33.33%
Total
26
100.00%
3
100.00%


EXPORT_SYMBOL(inet_addr_type);



unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
				__be32 addr)
{
	u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL;

	return __inet_dev_addr_type(net, dev, addr, rt_table);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Tóth László Attila
23
53.49%
1
20.00%
David Ahern
13
30.23%
3
60.00%
Eric W. Biedermann
7
16.28%
1
20.00%
Total
43
100.00%
5
100.00%


EXPORT_SYMBOL(inet_dev_addr_type);

/* inet_addr_type with dev == NULL but using the table from a dev
 * if one is associated
 */


unsigned int inet_addr_type_dev_table(struct net *net,
				      const struct net_device *dev,
				      __be32 addr)
{
	u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL;

	return __inet_dev_addr_type(net, NULL, addr, rt_table);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Ahern
43
100.00%
3
100.00%
Total
43
100.00%
3
100.00%


EXPORT_SYMBOL(inet_addr_type_dev_table);



__be32 fib_compute_spec_dst(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	struct in_device *in_dev;
	struct fib_result res;
	struct rtable *rt;
	struct net *net;
	int scope;

	rt = skb_rtable(skb);
	if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) ==
	    RTCF_LOCAL)
		return ip_hdr(skb)->daddr;

	in_dev = __in_dev_get_rcu(dev);
	BUG_ON(!in_dev);

	net = dev_net(dev);

	scope = RT_SCOPE_UNIVERSE;
	if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) {
		struct flowi4 fl4 = {
			.flowi4_iif = LOOPBACK_IFINDEX,
			.daddr = ip_hdr(skb)->saddr,
			.flowi4_tos = RT_TOS(ip_hdr(skb)->tos),
			.flowi4_scope = scope,
			.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0,
                };
		if (!fib_lookup(net, &fl4, &res, 0))
			return FIB_RES_PREFSRC(net, res);
	} else {
		scope = RT_SCOPE_LINK;
	}

	return inet_select_addr(dev, ip_hdr(skb)->saddr, scope);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David S. Miller
193
91.04%
2
33.33%
Lance Richardson
12
5.66%
1
16.67%
Julian Anastasov
4
1.89%
1
16.67%
Andy Gospodarek
2
0.94%
1
16.67%
Pavel Emelyanov
1
0.47%
1
16.67%
Total
212
100.00%
6
100.00%

/* Given (packet source, input interface) and optional (dst, oif, tos):
 * - (main) check, that source is valid i.e. not broadcast or our local
 *   address.
 * - figure out what "logical" interface this packet arrived
 *   and calculate "specific destination" address.
 * - check, that packet arrived from expected physical interface.
 * called with rcu_read_lock()
 */


static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
				 u8 tos, int oif, struct net_device *dev,
				 int rpf, struct in_device *idev, u32 *itag)
{
	int ret, no_addr;
	struct fib_result res;
	struct flowi4 fl4;
	struct net *net = dev_net(dev);
	bool dev_match;

	fl4.flowi4_oif = 0;
	fl4.flowi4_iif = l3mdev_master_ifindex_rcu(dev);
	if (!fl4.flowi4_iif)
		fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX;
	fl4.daddr = src;
	fl4.saddr = dst;
	fl4.flowi4_tos = tos;
	fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
	fl4.flowi4_tun_key.tun_id = 0;
	fl4.flowi4_flags = 0;
	fl4.flowi4_uid = sock_net_uid(net, NULL);

	no_addr = idev->ifa_list == NULL;

	fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0;

	trace_fib_validate_source(dev, &fl4);

	if (fib_lookup(net, &fl4, &res, 0))
		goto last_resort;
	if (res.type != RTN_UNICAST &&
	    (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev)))
		goto e_inval;
	if (!rpf && !fib_num_tclassid_users(net) &&
	    (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev)))
		goto last_resort;
	fib_combine_itag(itag, &res);
	dev_match = false;

#ifdef CONFIG_IP_ROUTE_MULTIPATH
	for (ret = 0; ret < res.fi->fib_nhs; ret++) {
		struct fib_nh *nh = &res.fi->fib_nh[ret];

		if (nh->nh_dev == dev) {
			dev_match = true;
			break;
		} else if (l3mdev_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) {
			dev_match = true;
			break;
		}
	}
#else
	if (FIB_RES_DEV(res) == dev)
		dev_match = true;
#endif
	if (dev_match) {
		ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
		return ret;
	}
	if (no_addr)
		goto last_resort;
	if (rpf == 1)
		goto e_rpf;
	fl4.flowi4_oif = dev->ifindex;

	ret = 0;
	if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) {
		if (res.type == RTN_UNICAST)
			ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
	}
	return ret;

last_resort:
	if (rpf)
		goto e_rpf;
	*itag = 0;
	return 0;

e_inval:
	return -EINVAL;
e_rpf:
	return -EXDEV;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
177
37.82%
4
14.29%
David S. Miller
125
26.71%
6
21.43%
David Ahern
51
10.90%
4
14.29%
Sébastien Barré
34
7.26%
1
3.57%
Julian Anastasov
17
3.63%
1
3.57%
Michael Smith
13
2.78%
1
3.57%
Denis V. Lunev
11
2.35%
2
7.14%
Eric Dumazet
9
1.92%
2
7.14%
Thomas Graf
8
1.71%
1
3.57%
Patrick McHardy
8
1.71%
1
3.57%
Jamal Hadi Salim
4
0.85%
1
3.57%
Andy Gospodarek
4
0.85%
1
3.57%
Cong Wang
3
0.64%
1
3.57%
Al Viro
2
0.43%
1
3.57%
Stephen Hemminger
2
0.43%
1
3.57%
Total
468
100.00%
28
100.00%

/* Ignore rp_filter for packets protected by IPsec. */


int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
			u8 tos, int oif, struct net_device *dev,
			struct in_device *idev, u32 *itag)
{
	int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev);

	if (!r && !fib_num_tclassid_users(dev_net(dev)) &&
	    IN_DEV_ACCEPT_LOCAL(idev) &&
	    (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) {
		*itag = 0;
		return 0;
	}
	return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David S. Miller
97
83.62%
2
50.00%
Julian Anastasov
14
12.07%
1
25.00%
Sébastien Barré
5
4.31%
1
25.00%
Total
116
100.00%
4
100.00%



static inline __be32 sk_extract_addr(struct sockaddr *addr)
{
	return ((struct sockaddr_in *) addr)->sin_addr.s_addr;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Graf
25
96.15%
1
50.00%
Al Viro
1
3.85%
1
50.00%
Total
26
100.00%
2
100.00%



static int put_rtax(struct nlattr *mx, int len, int type, u32 value)
{
	struct nlattr *nla;

	nla = (struct nlattr *) ((char *) mx + len);
	nla->nla_type = type;
	nla->nla_len = nla_attr_size(4);
	*(u32 *) nla_data(nla) = value;

	return len + nla_total_size(4);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Graf
69
89.61%
1
50.00%
Linus Torvalds (pre-git)
8
10.39%
1
50.00%
Total
77
100.00%
2
100.00%



static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
				 struct fib_config *cfg)
{
	__be32 addr;
	int plen;

	memset(cfg, 0, sizeof(*cfg));
	cfg->fc_nlinfo.nl_net = net;

	if (rt->rt_dst.sa_family != AF_INET)
		return -EAFNOSUPPORT;

	/*
         * Check mask for validity:
         * a) it must be contiguous.
         * b) destination must have all host bits clear.
         * c) if application forgot to set correct family (AF_INET),
         *    reject request unless it is absolutely clear i.e.
         *    both family and mask are zero.
         */
	plen = 32;
	addr = sk_extract_addr(&rt->rt_dst);
	if (!(rt->rt_flags & RTF_HOST)) {
		__be32 mask = sk_extract_addr(&rt->rt_genmask);

		if (rt->rt_genmask.sa_family != AF_INET) {
			if (mask || rt->rt_genmask.sa_family)
				return -EAFNOSUPPORT;
		}

		if (bad_mask(mask, addr))
			return -EINVAL;

		plen = inet_mask_len(mask);
	}

	cfg->fc_dst_len = plen;
	cfg->fc_dst = addr;

	if (cmd != SIOCDELRT) {
		cfg->fc_nlflags = NLM_F_CREATE;
		cfg->fc_protocol = RTPROT_BOOT;
	}

	if (rt->rt_metric)
		cfg->fc_priority = rt->rt_metric - 1;

	if (rt->rt_flags & RTF_REJECT) {
		cfg->fc_scope = RT_SCOPE_HOST;
		cfg->fc_type = RTN_UNREACHABLE;
		return 0;
	}

	cfg->fc_scope = RT_SCOPE_NOWHERE;
	cfg->fc_type = RTN_UNICAST;

	if (rt->rt_dev) {
		char *colon;
		struct net_device *dev;
		char devname[IFNAMSIZ];

		if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1))
			return -EFAULT;

		devname[IFNAMSIZ-1] = 0;
		colon = strchr(devname, ':');
		if (colon)
			*colon = 0;
		dev = __dev_get_by_name(net, devname);
		if (!dev)
			return -ENODEV;
		cfg->fc_oif = dev->ifindex;
		cfg->fc_table = l3mdev_fib_table(dev);
		if (colon) {
			struct in_ifaddr *ifa;
			struct in_device *in_dev = __in_dev_get_rtnl(dev);
			if (!in_dev)
				return -ENODEV;
			*colon = ':';
			for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
				if (strcmp(ifa->ifa_label, devname) == 0)
					break;
			if (!ifa)
				return -ENODEV;
			cfg->fc_prefsrc = ifa->ifa_local;
		}
	}

	addr = sk_extract_addr(&rt->rt_gateway);
	if (rt->rt_gateway.sa_family == AF_INET && addr) {
		unsigned int addr_type;

		cfg->fc_gw = addr;
		addr_type = inet_addr_type_table(net, addr, cfg->fc_table);
		if (rt->rt_flags & RTF_GATEWAY &&
		    addr_type == RTN_UNICAST)
			cfg->fc_scope = RT_SCOPE_UNIVERSE;
	}

	if (cmd == SIOCDELRT)
		return 0;

	if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
		return -EINVAL;

	if (cfg->fc_scope == RT_SCOPE_NOWHERE)
		cfg->fc_scope = RT_SCOPE_LINK;

	if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) {
		struct nlattr *mx;
		int len = 0;

		mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL);
		if (!mx)
			return -ENOMEM;

		if (rt->rt_flags & RTF_MTU)
			len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40);

		if (rt->rt_flags & RTF_WINDOW)
			len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window);

		if (rt->rt_flags & RTF_IRTT)
			len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3);

		cfg->fc_mx = mx;
		cfg->fc_mx_len = len;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Graf
558
84.16%
1
9.09%
Linus Torvalds (pre-git)
59
8.90%
2
18.18%
David Ahern
18
2.71%
1
9.09%
Denis V. Lunev
14
2.11%
2
18.18%
Mark Tomlinson
9
1.36%
1
9.09%
Al Viro
2
0.30%
2
18.18%
Ian Morris
2
0.30%
1
9.09%
Eric W. Biedermann
1
0.15%
1
9.09%
Total
663
100.00%
11
100.00%

/*
 * Handle IP routing ioctl calls.
 * These are used to manipulate the routing tables
 */


int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg)
{
	struct fib_config cfg;
	struct rtentry rt;
	int err;

	switch (cmd) {
	case SIOCADDRT:		/* Add a route */
	case SIOCDELRT:		/* Delete a route */
		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		if (copy_from_user(&rt, arg, sizeof(rt)))
			return -EFAULT;

		rtnl_lock();
		err = rtentry_to_fib_config(net, cmd, &rt, &cfg);
		if (err == 0) {
			struct fib_table *tb;

			if (cmd == SIOCDELRT) {
				tb = fib_get_table(net, cfg.fc_table);
				if (tb)
					err = fib_table_delete(net, tb, &cfg);
				else
					err = -ESRCH;
			} else {
				tb = fib_new_table(net, cfg.fc_table);
				if (tb)
					err = fib_table_insert(net, tb, &cfg);
				else
					err = -ENOBUFS;
			}

			/* allocated by rtentry_to_fib_config() */
			kfree(cfg.fc_mx);
		}
		rtnl_unlock();
		return err;
	}
	return -EINVAL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Graf
183
89.27%
1
14.29%
Denis V. Lunev
11
5.37%
3
42.86%
Eric W. Biedermann
5
2.44%
1
14.29%
Jiri Pirko
4
1.95%
1
14.29%
Stephen Hemminger
2
0.98%
1
14.29%
Total
205
100.00%
7
100.00%


const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = {
	[RTA_DST]		= { .type = NLA_U32 },
	[RTA_SRC]		= { .type = NLA_U32 },
	[RTA_IIF]		= { .type = NLA_U32 },
	[RTA_OIF]		= { .type = NLA_U32 },
	[RTA_GATEWAY]		= { .type = NLA_U32 },
	[RTA_PRIORITY]		= { .type = NLA_U32 },
	[RTA_PREFSRC]		= { .type = NLA_U32 },
	[RTA_METRICS]		= { .type = NLA_NESTED },
	[RTA_MULTIPATH]		= { .len = sizeof(struct rtnexthop) },
	[RTA_FLOW]		= { .type = NLA_U32 },
	[RTA_ENCAP_TYPE]	= { .type = NLA_U16 },
	[RTA_ENCAP]		= { .type = NLA_NESTED },
	[RTA_UID]		= { .type = NLA_U32 },
	[RTA_MARK]		= { .type = NLA_U32 },
};



static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
			     struct nlmsghdr *nlh, struct fib_config *cfg)
{
	struct