Release 4.15 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;
}

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4
40.00%
Pavel Emelyanov
34
32.38%
1
10.00%
Alexander Duyck
19
18.10%
3
30.00%
Ian Morris
2
1.90%
1
10.00%
David S. Miller
2
1.90%
1
10.00%
Total
105
100.00%
10
100.00%



static bool fib4_has_custom_rules(struct net *net)
{
	return false;
}
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#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;
}
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Patrick McHardy
56
34.36%
2
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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;
}

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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%



static bool fib4_has_custom_rules(struct net *net)
{
	return net->ipv4.fib_has_custom_rules;
}
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Paolo Abeni
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18
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1
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#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);
}

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Alexander Duyck
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80
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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;
}

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Alexander Duyck
107
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3
100.00%
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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);
}

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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%
Adrian Bunk
1
1.14%
1
12.50%
Stephen Hemminger
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;
}

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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%
Stephen Hemminger
1
0.71%
1
5.56%
Al Viro
1
0.71%
1
5.56%
Arnaldo Carvalho de Melo
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);
}
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29
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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);
}
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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);
}
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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);
}
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43
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43
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3
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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);
}

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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;
	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;
}

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Linus Torvalds (pre-git)
177
40.23%
4
14.29%
David S. Miller
125
28.41%
6
21.43%
David Ahern
51
11.59%
4
14.29%
Julian Anastasov
16
3.64%
1
3.57%
Michael Smith
13
2.95%
1
3.57%
Denis V. Lunev
11
2.50%
2
7.14%
Eric Dumazet
9
2.05%
2
7.14%
Patrick McHardy
8
1.82%
1
3.57%
Thomas Graf
8
1.82%
1
3.57%
Sébastien Barré
7
1.59%
1
3.57%
Andy Gospodarek
4
0.91%
1
3.57%
Jamal Hadi Salim
4
0.91%
1
3.57%
Cong Wang
3
0.68%
1
3.57%
Stephen Hemminger
2
0.45%
1
3.57%
Al Viro
2
0.45%
1
3.57%
Total
440
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);
	struct net *net = dev_net(dev);

	if (!r && !fib_num_tclassid_users(net) &&
	    (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) {
		if (IN_DEV_ACCEPT_LOCAL(idev))
			goto ok;
		/* with custom local routes in place, checking local addresses
                 * only will be too optimistic, with custom rules, checking
                 * local addresses only can be too strict, e.g. due to vrf
                 */
		if (net->ipv4.fib_has_custom_local_routes ||
		    fib4_has_custom_rules(net))
			goto full_check;
		if (inet_lookup_ifaddr_rcu(net, src))
			return -EINVAL;

ok:
		*itag = 0;
		return 0;
	}

full_check:
	return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag);
}

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David S. Miller
92
56.79%
2
33.33%
Paolo Abeni
55
33.95%
2
33.33%
Julian Anastasov
13
8.02%
1
16.67%
Sébastien Barré
2
1.23%
1
16.67%
Total
162
100.00%
6
100.00%



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

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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);
}

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Thomas Graf
69
89.61%
1
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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
557
84.01%
1
9.09%
Linus Torvalds (pre-git)
60
9.05%
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,
							       NULL);
				else
					err = -ESRCH;
			} else {
				tb = fib_new_table(net, cfg.fc_table);
				if (tb)
					err = fib_table_insert(net, tb,
							       &cfg, NULL);
				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
87.56%
1
11.11%
Denis V. Lunev
11
5.26%
3
33.33%
Eric W. Biedermann
5
2.39%
1
11.11%
Jiri Pirko
4
1.91%
1
11.11%
David Ahern
4
1.91%
2
22.22%
Stephen Hemminger
2
0.96%
1
11.11%
Total
209
100.00%
9
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 netlink_ext_ack *extack)
{
	struct nlattr *attr;
	int err, remaining;
	struct rtmsg *rtm;

	err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy,
			     extack);
	if (err < 0)
		goto errout;

	memset(cfg, 0, sizeof(*cfg));

	rtm = nlmsg_data(nlh);
	cfg->fc_dst_len = rtm->rtm_dst_len;
	cfg->fc_tos = rtm->rtm_tos;
	cfg->fc_table = rtm->rtm_table;
	cfg->fc_protocol = rtm->rtm_protocol;
	cfg->fc_scope = rtm->rtm_scope;
	cfg->fc_type = rtm->rtm_type;
	cfg->fc_flags = rtm->rtm_flags;
	cfg->fc_nlflags = nlh->nlmsg_flags;

	cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
	cfg->fc_nlinfo.nlh = nlh;
	cfg->fc_nlinfo.nl_net = net;

	if (cfg->fc_type > RTN_MAX) {
		NL_SET_ERR_MSG(extack, "Invalid route type");
		err = -EINVAL;
		goto errout;
	}

	nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) {
		switch (nla_type(attr)) {
		case RTA_DST:
			cfg->fc_dst = nla_get_be32(attr);
			break;
		case RTA_OIF:
			cfg->fc_oif = nla_get_u32(attr);
			break;
		case RTA_GATEWAY:
			cfg->fc_gw = nla_get_be32(attr);
			break;
		case RTA_PRIORITY:
			cfg->fc_priority = nla_get_u32(attr);
			break;
		case RTA_PREFSRC:
			cfg->fc_prefsrc = nla_get_be32(attr);
			break;
		case RTA_METRICS:
			cfg->fc_mx = nla_data(attr);
			cfg->fc_mx_len = nla_len(attr);
			break;
		case RTA_MULTIPATH:
			err = lwtunnel_valid_encap_type_attr(nla_data(attr),
							     nla_len(attr),
							     extack);
			if (err < 0)
				goto errout;
			cfg->fc_mp = nla_data(attr);
			cfg->fc_mp_len = nla_len(attr);
			break;
		case RTA_FLOW:
			cfg->fc_flow = nla_get_u32(attr);
			break;
		case RTA_TABLE:
			cfg->fc_table = nla_get_u32(attr);
			break;
		case RTA_ENCAP:
			cfg->fc_encap = attr;
			break;
		case RTA_ENCAP_TYPE:
			cfg->fc_encap_type = nla_get_u16(attr);
			err = lwtunnel_valid_encap_type(cfg->fc_encap_type,
							extack);
			if (err < 0)
				goto errout;
			break;
		}
	}

	return 0;
errout:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Graf
320
71.91%
3
17.65%
David Ahern
59
13.26%
4
23.53%
Linus Torvalds (pre-git)
23
5.17%
3
17.65%
Roopa Prabhu
23
5.17%
1
5.88%
Denis V. Lunev
13
2.92%
2
11.76%
Al Viro
3
0.67%
1
5.88%
Eric W. Biedermann
2
0.45%
1
5.88%
Johannes Berg
1
0.22%
1
5.88%
Patrick McHardy
1
0.22%
1
5.88%
Total
445
100.00%
17
100.00%



static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
			     struct netlink_ext_ack *extack)
{
	struct net *net = sock_net(skb->sk);
	struct fib_config cfg;
	struct fib_table *tb;
	int err;

	err = rtm_to_fib_config(net, skb, nlh, &cfg, extack);
	if (err < 0)
		goto errout;

	tb = fib_get_table(net, cfg.fc_table);
	if (!tb) {
		NL_SET_ERR_MSG(extack, "FIB table does not exist");
		err = -ESRCH;
		goto errout;
	}

	err = fib_table_delete(net, tb, &cfg, extack);
errout:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
43
35.25%
2
12.50%
Thomas Graf
42
34.43%
2
12.50%
David Ahern
16
13.11%
4
25.00%
Denis V. Lunev
13
10.66%
3
18.75%
Hideaki Yoshifuji / 吉藤英明
3
2.46%
1
6.25%
Jiri Pirko
2
1.64%
1
6.25%
Patrick McHardy
1
0.82%
1
6.25%
Ian Morris
1
0.82%
1
6.25%
Stephen Hemminger
1
0.82%
1
6.25%
Total
122
100.00%
16
100.00%



static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
			     struct netlink_ext_ack *extack)
{
	struct net *net = sock_net(skb->sk);
	struct fib_config cfg;
	struct fib_table *tb;
	int err;

	err = rtm_to_fib_config(net, skb, nlh, &cfg, extack);
	if (err < 0)
		goto errout;

	tb = fib_new_table(net, cfg.fc_table);
	if (!tb) {
		err = -ENOBUFS;
		goto errout;
	}

	err = fib_table_insert(net, tb, &cfg, extack);
	if (!err && cfg.fc_type == RTN_LOCAL)
		net->ipv4.fib_has_custom_local_routes = true;
errout:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Graf
44
32.84%
2
12.50%
Linus Torvalds (pre-git)
41
30.60%
2
12.50%
Paolo Abeni
19
14.18%
1
6.25%
Denis V. Lunev
13
9.70%
4
25.00%
David Ahern
9
6.72%
2
12.50%
Hideaki Yoshifuji / 吉藤英明
3
2.24%
1
6.25%
Jiri Pirko
2
1.49%
1
6.25%
Stephen Hemminger
1
0.75%
1
6.25%
Ian Morris
1
0.75%
1
6.25%
Patrick McHardy
1
0.75%
1
6.25%
Total
134
100.00%
16
100.00%



static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct net *net = sock_net(skb->sk);
	unsigned int h, s_h;
	unsigned int e = 0, s_e;
	struct fib_table *tb;
	struct hlist_head *head;
	int dumped = 0, err;

	if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
	    ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED)
		return skb->len;

	s_h = cb->args[0];
	s_e = cb->args[1];

	rcu_read_lock();

	for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
		e = 0;
		head = &net->ipv4.fib_table_hash[h];
		hlist_for_each_entry_rcu(tb, head, tb_hlist) {
			if (e < s_e)
				goto next;
			if (dumped)
				memset(&cb->args[2], 0, sizeof(cb->args) -
						 2 * sizeof(cb->args[0]));
			err = fib_table_dump(tb, skb, cb);
			if (err < 0) {
				if (likely(skb->len))
					goto out;

				goto out_err;
			}
			dumped = 1;
next:
			e++;
		}
	}
out:
	err = skb->len;
out_err:
	rcu_read_unlock();

	cb->args[1] = e;
	cb->args[0] = h;

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
136
47.72%
3
23.08%
Patrick McHardy
76
26.67%
1
7.69%
David Ahern
31
10.88%
1
7.69%
Denis V. Lunev
26
9.12%
2
15.38%
Alexander Duyck
7
2.46%
1
7.69%
Hideaki Yoshifuji / 吉藤英明
3
1.05%
1
7.69%
Thomas Graf
3
1.05%
2
15.38%
Li RongQing
2
0.70%
1
7.69%
Stephen Hemminger
1
0.35%
1
7.69%
Total
285
100.00%
13
100.00%

/* Prepare and feed intra-kernel routing request.
 * Really, it should be netlink message, but :-( netlink
 * can be not configured, so that we feed it directly
 * to fib engine. It is legal, because all events occur
 * only when netlink is already locked.
 */


static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa)
{
	struct net *net = dev_net(ifa->ifa_dev->dev);
	u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev);
	struct fib_table *tb;
	struct fib_config cfg = {
		.fc_protocol = RTPROT_KERNEL,
		.fc_type = type,
		.fc_dst = dst,
		.fc_dst_len = dst_len,
		.fc_prefsrc = ifa->ifa_local,
		.fc_oif = ifa->ifa_dev->dev->ifindex,
		.fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
		.fc_nlinfo = {
			.nl_net = net,
                },
        };

	if (!tb_id)
		tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL;

	tb = fib_new_table(net, tb_id);
	if (!tb)
		return;

	cfg.fc_table = tb->tb_id;

	if (type != RTN_LOCAL)
		cfg.fc_scope = RT_SCOPE_LINK;
	else
		cfg.fc_scope = RT_SCOPE_HOST;

	if (cmd == RTM_NEWROUTE)
		fib_table_insert(net, tb, &cfg, NULL);
	else
		fib_table_delete(net, tb, &cfg, NULL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
82
40.00%
1
6.67%
Thomas Graf
62
30.24%
1
6.67%
David Ahern
27
13.17%
5
33.33%
Denis V. Lunev
23
11.22%
3
20.00%
Jiri Pirko
4
1.95%
1
6.67%
Hideaki Yoshifuji / 吉藤英明
3
1.46%
1
6.67%
Stephen Hemminger
2
0.98%
1
6.67%
Al Viro
1
0.49%
1
6.67%
Ian Morris
1
0.49%
1
6.67%
Total
205
100.00%
15
100.00%



void fib_add_ifaddr(struct in_ifaddr *ifa)
{
	struct in_device *in_dev = ifa->ifa_dev;
	struct net_device *dev = in_dev->dev;
	struct in_ifaddr *prim = ifa;
	__be32 mask = ifa->ifa_mask;
	__be32 addr = ifa->ifa_local;
	__be32 prefix = ifa->ifa_address & mask;

	if (ifa->ifa_flags & IFA_F_SECONDARY) {
		prim = inet_ifa_byprefix(in_dev, prefix, mask);
		if (!prim) {
			pr_warn("%s: bug: prim == NULL\n", __func__);
			return;
		}
	}

	fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);

	if (!(dev->flags & IFF_UP))
		return;

	/* Add broadcast address, if it is explicitly assigned. */
	if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF))
		fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);

	if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) &&
	    (prefix != addr || ifa->ifa_prefixlen < 32)) {
		if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
			fib_magic(RTM_NEWROUTE,
				  dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
				  prefix, ifa->ifa_prefixlen, prim);

		/* Add network specific broadcasts, when it takes a sense */
		if (ifa->ifa_prefixlen < 31) {
			fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
			fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask,
				  32, prim);
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
232
90.98%
4
44.44%
Paolo Abeni
11
4.31%
1
11.11%
Al Viro
6
2.35%
1
11.11%
Joe Perches
5
1.96%
2
22.22%
Ian Morris
1
0.39%
1
11.11%
Total
255
100.00%
9
100.00%

/* Delete primary or secondary address.
 * Optionally, on secondary address promotion consider the addresses
 * from subnet iprim as deleted, even if they are in device list.
 * In this case the secondary ifa can be in device list.
 */


void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim)
{
	struct in_device *in_dev = ifa->ifa_dev;
	struct net_device *dev = in_dev->dev;
	struct in_ifaddr *ifa1;
	struct in_ifaddr *prim = ifa, *prim1 = NULL;
	__be32 brd = ifa->ifa_address | ~ifa->ifa_mask;
	__be32 any = ifa->ifa_address & ifa->ifa_mask;

#define LOCAL_OK	1

#define BRD_OK		2

#define BRD0_OK		4

#define BRD1_OK		8
	unsigned int ok = 0;
	int subnet = 0;		/* Primary network */
	int gone = 1;		/* Address is missing */
	int same_prefsrc = 0;	/* Another primary with same IP */

	if (ifa->ifa_flags & IFA_F_SECONDARY) {
		prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
		if (!prim) {
			/* if the device has been deleted, we don't perform
                         * address promotion
                         */
			if (!in_dev->dead)
				pr_warn("%s: bug: prim == NULL\n", __func__);
			return;
		}
		if (iprim && iprim != prim) {
			pr_warn("%s: bug: iprim != prim\n", __func__);
			return;
		}
	} else if (!ipv4_is_zeronet(any) &&
		   (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) {
		if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE))
			fib_magic(RTM_DELROUTE,
				  dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
				  any, ifa->ifa_prefixlen, prim);
		subnet = 1;
	}

	if (in_dev->dead)
		goto no_promotions;

	/* Deletion is more complicated than add.
         * We should take care of not to delete too much :-)
         *
         * Scan address list to be sure that addresses are really gone.
         */

	for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
		if (ifa1 == ifa) {
			/* promotion, keep the IP */
			gone = 0;
			continue;
		}
		/* Ignore IFAs from our subnet */
		if (iprim && ifa1->ifa_mask == iprim->ifa_mask &&
		    inet_ifa_match(ifa1->ifa_address, iprim))
			continue;

		/* Ignore ifa1 if it uses different primary IP (prefsrc) */
		if (ifa1->ifa_flags & IFA_F_SECONDARY) {
			/* Another address from our subnet? */
			if (ifa1->ifa_mask == prim->ifa_mask &&
			    inet_ifa_match(ifa1->ifa_address, prim))
				prim1 = prim;
			else {
				/* We reached the secondaries, so
                                 * same_prefsrc should be determined.
                                 */
				if (!same_prefsrc)
					continue;
				/* Search new prim1 if ifa1 is not
                                 * using the current prim1
                                 */
				if (!prim1 ||
				    ifa1->ifa_mask != prim1->ifa_mask ||
				    !inet_ifa_match(ifa1->ifa_address, prim1))
					prim1 = inet_ifa_byprefix(in_dev,
							ifa1->ifa_address,
							ifa1->ifa_mask);
				if (!prim1)
					continue;
				if (prim1->ifa_local != prim->ifa_local)
					continue;
			}
		} else {
			if (prim->ifa_local != ifa1->ifa_local)
				continue;
			prim1 = ifa1;
			if (prim != prim1)
				same_prefsrc = 1;
		}
		if (ifa->ifa_local == ifa1->ifa_local)
			ok |= LOCAL_OK;
		if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
			ok |= BRD_OK;
		if (brd == ifa1->ifa_broadcast)
			ok |= BRD1_OK;
		if (any == ifa1->ifa_broadcast)
			ok |= BRD0_OK;
		/* primary has network specific broadcasts */
		if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) {
			__be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask;
			__be32 any1 = ifa1->ifa_address & ifa1->ifa_mask;

			if (!ipv4_is_zeronet(any1)) {
				if (ifa->ifa_broadcast == brd1 ||
				    ifa->ifa_broadcast == any1)
					ok |= BRD_OK;
				if (brd == brd1 || brd == any1)
					ok |= BRD1_OK;
				if (any == brd1 || any == any1)
					ok |= BRD0_OK;
			}
		}
	}

no_promotions:
	if (!(ok & BRD_OK))
		fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
	if (subnet && ifa->ifa_prefixlen < 31) {
		if (!(ok & BRD1_OK))
			fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
		if (!(ok & BRD0_OK))
			fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
	}
	if (!(ok & LOCAL_OK)) {
		unsigned int addr_type;

		fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);

		/* Check, that this local address finally disappeared. */
		addr_type = inet_addr_type_dev_table(dev_net(dev), dev,
						     ifa->ifa_local);
		if (gone && addr_type != RTN_LOCAL) {
			/* And the last, but not the least thing.
                         * We must flush stray FIB entries.
                         *
                         * First of all, we scan fib_info list searching
                         * for stray nexthop entries, then ignite fib_flush.
                         */
			if (fib_sync_down_addr(dev, ifa->ifa_local))
				fib_flush(dev_net(dev));
		}
	}

#undef LOCAL_OK

#undef BRD_OK

#undef BRD0_OK

#undef BRD1_OK
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Julian Anastasov
366
48.74%
1
5.26%
Linus Torvalds (pre-git)
312
41.54%
3
15.79%
Paolo Abeni
19
2.53%
2
10.53%
David Ahern
15
2.00%
1
5.26%
David S. Miller
11
1.46%
1
5.26%
Joe Perches
8
1.07%
1
5.26%
Denis V. Lunev
7
0.93%
4
21.05%
Hideaki Yoshifuji / 吉藤英明
6
0.80%
1
5.26%
Eric Dumazet
3
0.40%
2
10.53%
Al Viro
2
0.27%
1
5.26%
Ian Morris
1
0.13%
1
5.26%
Eric W. Biedermann
1
0.13%
1
5.26%
Total
751
100.00%
19
100.00%



static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn)
{

	struct fib_result       res;
	struct flowi4           fl4 = {
		.flowi4_mark = frn->fl_mark,
		.daddr = frn->fl_addr,
		.flowi4_tos = frn->fl_tos,
		.flowi4_scope = frn->fl_scope,
        };
	struct fib_table *tb;

	rcu_read_lock();

	tb = fib_get_table(net, frn->tb_id_in);

	frn->err = -ENOENT;
	if (tb) {
		local_bh_disable();

		frn->tb_id = tb->tb_id;
		frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);

		if (!frn->err) {
			frn->prefixlen = res.prefixlen;
			frn->nh_sel = res.nh_sel;
			frn->type = res.type;
			frn->scope = res.scope;
		}
		local_bh_enable();
	}

	rcu_read_unlock();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Olsson
111
68.94%
1
11.11%
Alexander Duyck
26
16.15%
1
11.11%
Alexey Kuznetsov
7
4.35%
1
11.11%
David S. Miller
7
4.35%
1
11.11%
Thomas Graf
6
3.73%
2
22.22%
Eric Dumazet
2
1.24%
1
11.11%
Changli Gao
1
0.62%
1
11.11%
Stephen Hemminger
1
0.62%
1
11.11%
Total
161
100.00%
9
100.00%



static void nl_fib_input(struct sk_buff *skb)
{
	struct net *net;
	struct fib_result_nl *frn;
	struct nlmsghdr *nlh;
	u32 portid;

	net = sock_net(skb->sk);
	nlh = nlmsg_hdr(skb);
	if (skb->len < nlmsg_total_size(sizeof(*frn)) ||
	    skb->len < nlh->nlmsg_len ||
	    nlmsg_len(nlh) < sizeof(*frn))
		return;

	skb = netlink_skb_clone(skb, GFP_KERNEL);
	if (!skb)
		return;
	nlh = nlmsg_hdr(skb);

	frn = (struct fib_result_nl *) nlmsg_data(nlh);
	nl_fib_lookup(net, frn);

	portid = NETLINK_CB(skb).portid;      /* netlink portid */
	NETLINK_CB(skb).portid = 0;        /* from kernel */
	NETLINK_CB(skb).dst_group = 0;  /* unicast */
	netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Olsson
67
40.36%
1
5.56%
Denis V. Lunev
34
20.48%
4
22.22%
Thomas Graf
28
16.87%
1
5.56%
Eric Dumazet
8
4.82%
1
5.56%
Alexey Kuznetsov
5
3.01%
1
5.56%
Eric W. Biedermann
5
3.01%
1
5.56%
David S. Miller
4
2.41%
1
5.56%
Hong Zhi Guo
4
2.41%
1
5.56%
Arnaldo Carvalho de Melo
3
1.81%
1
5.56%
Hideaki Yoshifuji / 吉藤英明
3
1.81%
1
5.56%
Pablo Neira Ayuso
1
0.60%
1
5.56%
Rami Rosen
1
0.60%
1
5.56%
Patrick McHardy
1
0.60%
1
5.56%
Alexander Duyck
1
0.60%
1
5.56%
Ian Morris
1
0.60%
1
5.56%
Total
166
100.00%
18
100.00%



static int __net_init nl_fib_lookup_init(struct net *net)
{
	struct sock *sk;
	struct netlink_kernel_cfg cfg = {
		.input	= nl_fib_input,
        };

	sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg);
	if (!sk)
		return -EAFNOSUPPORT;
	net->ipv4.fibnl = sk;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Denis V. Lunev
33
55.00%
3
37.50%
Pablo Neira Ayuso
13
21.67%
1
12.50%
Robert Olsson
11
18.33%
1
12.50%
Ian Morris
1
1.67%
1
12.50%
Alexey Dobriyan
1
1.67%
1
12.50%
Eric W. Biedermann
1
1.67%
1
12.50%
Total
60
100.00%
8
100.00%



static void nl_fib_lookup_exit(struct net *net)
{
	netlink_kernel_release(net->ipv4.fibnl);
	net->ipv4.fibnl = NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Denis V. Lunev
27
96.43%
3
75.00%
Robert Olsson
1
3.57%
1
25.00%
Total
28
100.00%
4
100.00%



static void fib_disable_ip(struct net_device *dev, unsigned long event,
			   bool force)
{
	if (fib_sync_down_dev(dev, event, force))
		fib_flush(dev_net(dev));
	else
		rt_cache_flush(dev_net(dev));
	arp_ifdown(dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
30
58.82%
2
20.00%
Denis V. Lunev
8
15.69%
4
40.00%
Julian Anastasov
5
9.80%
1
10.00%
Andy Gospodarek
4
7.84%
1
10.00%
Hideaki Yoshifuji / 吉藤英明
3
5.88%
1
10.00%
Gao Feng
1
1.96%
1
10.00%
Total
51
100.00%
10
100.00%



static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
{
	struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
	struct net_device *dev = ifa->ifa_dev->dev;
	struct net *net = dev_net(dev);

	switch (event) {
	case NETDEV_UP:
		fib_add_ifaddr(ifa);
#ifdef CONFIG_IP_ROUTE_MULTIPATH
		fib_sync_up(dev, RTNH_F_DEAD);
#endif
		atomic_inc(&net->ipv4.dev_addr_genid);
		rt_cache_flush(dev_net(dev));
		break;
	case NETDEV_DOWN:
		fib_del_ifaddr(ifa, NULL);
		atomic_inc(&net->ipv4.dev_addr_genid);
		if (!ifa->ifa_dev->ifa_list) {
			/* Last address was deleted from this interface.
                         * Disable IP.
                         */
			fib_disable_ip(dev, event, true);
		} else {
			rt_cache_flush(dev_net(dev));
		}
		break;
	}
	return NOTIFY_DONE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
80
52.29%
2
16.67%
David S. Miller
30
19.61%
2
16.67%
Denis V. Lunev
19
12.42%
1
8.33%
Alexey Kuznetsov
10
6.54%
1
8.33%
Linus Torvalds
5
3.27%
1
8.33%
Julian Anastasov
4
2.61%
2
16.67%
Andy Gospodarek
3
1.96%
1
8.33%
Ian Morris
1
0.65%
1
8.33%
Eric Dumazet
1
0.65%
1
8.33%
Total
153
100.00%
12
100.00%



static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	struct netdev_notifier_changeupper_info *info;
	struct in_device *in_dev;
	struct net *net = dev_net(dev);
	unsigned int flags;

	if (event == NETDEV_UNREGISTER) {
		fib_disable_ip(dev, event, true);
		rt_flush_dev(dev);
		return NOTIFY_DONE;
	}

	in_dev = __in_dev_get_rtnl(dev);
	if (!in_dev)
		return NOTIFY_DONE;

	switch (event) {
	case NETDEV_UP:
		for_ifa(in_dev) {
			fib_add_ifaddr(ifa);
		} endfor_ifa(in_dev);
#ifdef CONFIG_IP_ROUTE_MULTIPATH
		fib_sync_up(dev, RTNH_F_DEAD);
#endif
		atomic_inc(&net->ipv4.dev_addr_genid);
		rt_cache_flush(net);
		break;
	case NETDEV_DOWN:
		fib_disable_ip(dev, event, false);
		break;
	case NETDEV_CHANGE:
		flags = dev_get_flags(dev);
		if (flags & (IFF_RUNNING | IFF_LOWER_UP))
			fib_sync_up(dev, RTNH_F_LINKDOWN);
		else
			fib_sync_down_dev(dev, event, false);
		/* fall through */
	case NETDEV_CHANGEMTU:
		rt_cache_flush(net);
		break;
	case NETDEV_CHANGEUPPER:
		info = ptr;
		/* flush all routes if dev is linked to or unlinked from
                 * an L3 master device (e.g., VRF)
                 */
		if (info->upper_dev && netif_is_l3_master(info->upper_dev))
			fib_disable_ip(dev, NETDEV_DOWN, true);
		break;
	}
	return NOTIFY_DONE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
95
39.58%
5
33.33%
Andy Gospodarek
43
17.92%
1
6.67%
David Ahern
36
15.00%
1
6.67%
David S. Miller
25
10.42%
2
13.33%
Alexey Kuznetsov
15
6.25%
1
6.67%
Eric Dumazet
9
3.75%
2
13.33%
Oliver Hartkopp
8
3.33%
1
6.67%
Julian Anastasov
6
2.50%
1
6.67%
Jiri Pirko
3
1.25%
1
6.67%
Total
240
100.00%
15
100.00%


static struct notifier_block fib_inetaddr_notifier = {
	.notifier_call = fib_inetaddr_event,
};


static struct notifier_block fib_netdev_notifier = {
	.notifier_call = fib_netdev_event,
};



static int __net_init ip_fib_net_init(struct net *net)
{
	int err;
	size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ;

	err = fib4_notifier_init(net);
	if (err)
		return err;

	/* Avoid false sharing : Use at least a full cache line */
	size = max_t(size_t, size, L1_CACHE_BYTES);

	net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL);
	if (!net->ipv4.fib_table_hash) {
		err = -ENOMEM;
		goto err_table_hash_alloc;
	}

	err = fib4_rules_init(net);
	if (err < 0)
		goto err_rules_init;
	return 0;

err_rules_init:
	kfree(net->ipv4.fib_table_hash);
err_table_hash_alloc:
	fib4_notifier_exit(net);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Denis V. Lunev
64
51.61%
4
33.33%
Ido Schimmel
31
25.00%
2
16.67%
Eric Dumazet
23
18.55%
1
8.33%
Linus Torvalds (pre-git)
3
2.42%
2
16.67%
Ian Morris
1
0.81%
1
8.33%
Patrick McHardy
1
0.81%
1
8.33%
Thomas Graf
1
0.81%
1
8.33%
Total
124
100.00%
12
100.00%



static void ip_fib_net_exit(struct net *net)
{
	int i;

	rtnl_lock();
#ifdef CONFIG_IP_MULTIPLE_TABLES
	RCU_INIT_POINTER(net->ipv4.fib_main, NULL);
	RCU_INIT_POINTER(net->ipv4.fib_default, NULL);
#endif
	/* Destroy the tables in reverse order to guarantee that the
         * local table, ID 255, is destroyed before the main table, ID
         * 254. This is necessary as the local table may contain
         * references to data contained in the main table.
         */
	for (i = FIB_TABLE_HASHSZ - 1; i >= 0; i--) {
		struct hlist_head *head = &net->ipv4.fib_table_hash[i];
		struct hlist_node *tmp;
		struct fib_table *tb;

		hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) {
			hlist_del(&tb->tb_hlist);
			fib_table_flush(net, tb);
			fib_free_table(tb);
		}
	}

#ifdef CONFIG_IP_MULTIPLE_TABLES
	fib4_rules_exit(net);
#endif
	rtnl_unlock();
	kfree(net->ipv4.fib_table_hash);
	fib4_notifier_exit(net);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Duyck
70
47.95%
3
25.00%
Denis V. Lunev
54
36.99%
2
16.67%
Ido Schimmel
12
8.22%
2
16.67%
Sabrina Dubroca
3
2.05%
1
8.33%
Eric Dumazet
3
2.05%
1
8.33%
Jiri Pirko
2
1.37%
1
8.33%
Pavel Emelyanov
1
0.68%
1
8.33%
Linus Torvalds (pre-git)
1
0.68%
1
8.33%
Total
146
100.00%
12
100.00%



static int __net_init fib_net_init(struct net *net)
{
	int error;

#ifdef CONFIG_IP_ROUTE_CLASSID
	net->ipv4.fib_num_tclassid_users = 0;
#endif
	error = ip_fib_net_init(net);
	if (error < 0)
		goto out;
	error = nl_fib_lookup_init(net);
	if (error < 0)
		goto out_nlfl;
	error = fib_proc_init(net);
	if (error < 0)
		goto out_proc;
out:
	return error;

out_proc:
	nl_fib_lookup_exit(net);
out_nlfl:
	ip_fib_net_exit(net);
	goto out;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Denis V. Lunev
81
82.65%
1
25.00%
David S. Miller
13
13.27%
1
25.00%
Robert Olsson
2
2.04%
1
25.00%
Linus Torvalds (pre-git)
2
2.04%
1
25.00%
Total
98
100.00%
4
100.00%



static void __net_exit fib_net_exit(struct net *net)
{
	fib_proc_exit(net);
	nl_fib_lookup_exit(net);
	ip_fib_net_exit(net);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Denis V. Lunev
27
100.00%
1
100.00%
Total
27
100.00%
1
100.00%


static struct pernet_operations fib_net_ops = {
	.init = fib_net_init,
	.exit = fib_net_exit,
};



void __init ip_fib_init(void)
{
	fib_trie_init();

	register_pernet_subsys(&fib_net_ops);

	register_netdevice_notifier(&fib_netdev_notifier);
	register_inetaddr_notifier(&fib_inetaddr_notifier);

	rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, 0);
	rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, 0);
	rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, 0);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Graf
33
48.53%
1
16.67%
Mahesh Bandewar
21
30.88%
1
16.67%
Denis V. Lunev
7
10.29%
1
16.67%
Greg Rose
3
4.41%
1
16.67%
Florian Westphal
3
4.41%
1
16.67%
Linus Torvalds (pre-git)
1
1.47%
1
16.67%
Total
68
100.00%
6
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
1547
23.42%
13
7.03%
Thomas Graf
1512
22.89%
12
6.49%
Denis V. Lunev
603
9.13%
20
10.81%
David S. Miller
547
8.28%
15
8.11%
Julian Anastasov
415
6.28%
5
2.70%
David Ahern
386
5.84%
18
9.73%
Alexander Duyck
370
5.60%
10
5.41%
Patrick McHardy
220
3.33%
6
3.24%
Robert Olsson
192
2.91%
1
0.54%
Paolo Abeni
136
2.06%
4
2.16%
Eric Dumazet
78
1.18%
10
5.41%
Tóth László Attila
63
0.95%
1
0.54%
Andy Gospodarek
56
0.85%
2
1.08%
Roopa Prabhu
45
0.68%
1
0.54%
Pavel Emelyanov
45
0.68%
4
2.16%
Ido Schimmel
43
0.65%
3
1.62%
Alexey Kuznetsov
37
0.56%
3
1.62%
Eric W. Biedermann
35
0.53%
5
2.70%
Hideaki Yoshifuji / 吉藤英明
24
0.36%
2
1.08%
Mahesh Bandewar
21
0.32%
1
0.54%
Jiri Pirko
19
0.29%
2
1.08%
Al Viro
18
0.27%
6
3.24%
Michael Smith
16
0.24%
2
1.08%
Joe Perches
15
0.23%
2
1.08%
Pablo Neira Ayuso
14
0.21%
2
1.08%
Ian Morris
13
0.20%
1
0.54%
Lance Richardson
12
0.18%
1
0.54%
Stephen Hemminger
12
0.18%
2
1.08%
Liping Zhang
11
0.17%
1
0.54%
Lorenzo Colitti
11
0.17%
1
0.54%
Arnaldo Carvalho de Melo
10
0.15%
4
2.16%
Linus Torvalds
10
0.15%
3
1.62%
Mark Tomlinson
9
0.14%
1
0.54%
Sébastien Barré
9
0.14%
1
0.54%
Oliver Hartkopp
8
0.12%
1
0.54%
Adrian Bunk
5
0.08%
3
1.62%
Rusty Russell
4
0.06%
1
0.54%
Jamal Hadi Salim
4
0.06%
1
0.54%
Hong Zhi Guo
4
0.06%
1
0.54%
Greg Rose
3
0.05%
1
0.54%
Randy Dunlap
3
0.05%
1
0.54%
Cong Wang
3
0.05%
1
0.54%
Sabrina Dubroca
3
0.05%
1
0.54%
Florian Westphal
3
0.05%
1
0.54%
Tejun Heo
3
0.05%
1
0.54%
Li RongQing
2
0.03%
1
0.54%
Johannes Berg
1
0.02%
1
0.54%
Rami Rosen
1
0.02%
1
0.54%
Alexey Dobriyan
1
0.02%
1
0.54%
Gao Feng
1
0.02%
1
0.54%
Changli Gao
1
0.02%
1
0.54%
Jan Engelhardt
1
0.02%
1
0.54%
Total
6605
100.00%
185
100.00%
Directory: net/ipv4

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