Release 4.15 net/ipv6/sit.c

/*
 *      IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
 *      Linux INET6 implementation
 *
 *      Authors:
 *      Pedro Roque             <roque@di.fc.ul.pt>
 *      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.
 *
 *      Changes:
 * Roger Venning <r.venning@telstra.com>:       6to4 support
 * Nate Thompson <nate@thebog.net>:             6to4 support
 * Fred Templin <fred.l.templin@boeing.com>:    isatap support
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/icmp.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/init.h>
#include <linux/netfilter_ipv4.h>
#include <linux/if_ether.h>

#include <net/sock.h>
#include <net/snmp.h>

#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/transp_v6.h>
#include <net/ip6_fib.h>
#include <net/ip6_route.h>
#include <net/ndisc.h>
#include <net/addrconf.h>
#include <net/ip.h>
#include <net/udp.h>
#include <net/icmp.h>
#include <net/ip_tunnels.h>
#include <net/inet_ecn.h>
#include <net/xfrm.h>
#include <net/dsfield.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>

/*
   This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c

   For comments look at net/ipv4/ip_gre.c --ANK
 */


#define IP6_SIT_HASH_SIZE  16

#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)


static bool log_ecn_error = true;
module_param(log_ecn_error, bool, 0644);
MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");

static int ipip6_tunnel_init(struct net_device *dev);
static void ipip6_tunnel_setup(struct net_device *dev);
static void ipip6_dev_free(struct net_device *dev);
static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
		      __be32 *v4dst);

static struct rtnl_link_ops sit_link_ops __read_mostly;


static unsigned int sit_net_id __read_mostly;

struct sit_net {
	
struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE];
	
struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE];
	
struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE];
	
struct ip_tunnel __rcu *tunnels_wc[1];
	
struct ip_tunnel __rcu **tunnels[4];

	
struct net_device *fb_tunnel_dev;
};

/*
 * Must be invoked with rcu_read_lock
 */


static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
					     struct net_device *dev,
					     __be32 remote, __be32 local,
					     int sifindex)
{
	unsigned int h0 = HASH(remote);
	unsigned int h1 = HASH(local);
	struct ip_tunnel *t;
	struct sit_net *sitn = net_generic(net, sit_net_id);
	int ifindex = dev ? dev->ifindex : 0;

	for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
		if (local == t->parms.iph.saddr &&
		    remote == t->parms.iph.daddr &&
		    (!dev || !t->parms.link || ifindex == t->parms.link ||
		     sifindex == t->parms.link) &&
		    (t->dev->flags & IFF_UP))
			return t;
	}
	for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
		if (remote == t->parms.iph.daddr &&
		    (!dev || !t->parms.link || ifindex == t->parms.link ||
		     sifindex == t->parms.link) &&
		    (t->dev->flags & IFF_UP))
			return t;
	}
	for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
		if (local == t->parms.iph.saddr &&
		    (!dev || !t->parms.link || ifindex == t->parms.link ||
		     sifindex == t->parms.link) &&
		    (t->dev->flags & IFF_UP))
			return t;
	}
	t = rcu_dereference(sitn->tunnels_wc[0]);
	if (t && (t->dev->flags & IFF_UP))
		return t;
	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
147
49.33%
2
18.18%
Sascha Hlusiak
66
22.15%
1
9.09%
David Ahern
38
12.75%
1
9.09%
Pavel Emelyanov
19
6.38%
2
18.18%
Eric Dumazet
17
5.70%
2
18.18%
Américo Wang
6
2.01%
1
9.09%
Shmulik Ladkani
3
1.01%
1
9.09%
Al Viro
2
0.67%
1
9.09%
Total
298
100.00%
11
100.00%



static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
		struct ip_tunnel_parm *parms)
{
	__be32 remote = parms->iph.daddr;
	__be32 local = parms->iph.saddr;
	unsigned int h = 0;
	int prio = 0;

	if (remote) {
		prio |= 2;
		h ^= HASH(remote);
	}
	if (local) {
		prio |= 1;
		h ^= HASH(local);
	}
	return &sitn->tunnels[prio][h];
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
79
83.16%
1
16.67%
Pavel Emelyanov
7
7.37%
2
33.33%
Hideaki Yoshifuji / 吉藤英明
5
5.26%
1
16.67%
Eric Dumazet
2
2.11%
1
16.67%
Al Viro
2
2.11%
1
16.67%
Total
95
100.00%
6
100.00%



static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
		struct ip_tunnel *t)
{
	return __ipip6_bucket(sitn, &t->parms);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hideaki Yoshifuji / 吉藤英明
24
75.00%
1
33.33%
Pavel Emelyanov
7
21.88%
1
33.33%
Eric Dumazet
1
3.12%
1
33.33%
Total
32
100.00%
3
100.00%



static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
{
	struct ip_tunnel __rcu **tp;
	struct ip_tunnel *iter;

	for (tp = ipip6_bucket(sitn, t);
	     (iter = rtnl_dereference(*tp)) != NULL;
	     tp = &iter->next) {
		if (t == iter) {
			rcu_assign_pointer(*tp, t->next);
			break;
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
53
67.09%
2
40.00%
Eric Dumazet
19
24.05%
2
40.00%
Pavel Emelyanov
7
8.86%
1
20.00%
Total
79
100.00%
5
100.00%



static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
{
	struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);

	rcu_assign_pointer(t->next, rtnl_dereference(*tp));
	rcu_assign_pointer(*tp, t);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
33
64.71%
2
33.33%
Eric Dumazet
11
21.57%
3
50.00%
Pavel Emelyanov
7
13.73%
1
16.67%
Total
51
100.00%
6
100.00%



static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
{
#ifdef CONFIG_IPV6_SIT_6RD
	struct ip_tunnel *t = netdev_priv(dev);

	if (t->dev == sitn->fb_tunnel_dev) {
		ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
		t->ip6rd.relay_prefix = 0;
		t->ip6rd.prefixlen = 16;
		t->ip6rd.relay_prefixlen = 0;
	} else {
		struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
		memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
	}
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hideaki Yoshifuji / 吉藤英明
123
100.00%
2
100.00%
Total
123
100.00%
2
100.00%



static int ipip6_tunnel_create(struct net_device *dev)
{
	struct ip_tunnel *t = netdev_priv(dev);
	struct net *net = dev_net(dev);
	struct sit_net *sitn = net_generic(net, sit_net_id);
	int err;

	memcpy(dev->dev_addr, &t->parms.iph.saddr, 4);
	memcpy(dev->broadcast, &t->parms.iph.daddr, 4);

	if ((__force u16)t->parms.i_flags & SIT_ISATAP)
		dev->priv_flags |= IFF_ISATAP;

	dev->rtnl_link_ops = &sit_link_ops;

	err = register_netdevice(dev);
	if (err < 0)
		goto out;

	ipip6_tunnel_clone_6rd(dev, sitn);

	dev_hold(dev);

	ipip6_tunnel_link(sitn, t);
	return 0;

out:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
115
75.66%
2
50.00%
Steffen Klassert
30
19.74%
1
25.00%
Thadeu Lima de Souza Cascardo
7
4.61%
1
25.00%
Total
152
100.00%
4
100.00%



static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
		struct ip_tunnel_parm *parms, int create)
{
	__be32 remote = parms->iph.daddr;
	__be32 local = parms->iph.saddr;
	struct ip_tunnel *t, *nt;
	struct ip_tunnel __rcu **tp;
	struct net_device *dev;
	char name[IFNAMSIZ];
	struct sit_net *sitn = net_generic(net, sit_net_id);

	for (tp = __ipip6_bucket(sitn, parms);
	    (t = rtnl_dereference(*tp)) != NULL;
	     tp = &t->next) {
		if (local == t->parms.iph.saddr &&
		    remote == t->parms.iph.daddr &&
		    parms->link == t->parms.link) {
			if (create)
				return NULL;
			else
				return t;
		}
	}
	if (!create)
		goto failed;

	if (parms->name[0])
		strlcpy(name, parms->name, IFNAMSIZ);
	else
		strcpy(name, "sit%d");

	dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
			   ipip6_tunnel_setup);
	if (!dev)
		return NULL;

	dev_net_set(dev, net);

	nt = netdev_priv(dev);

	nt->parms = *parms;
	if (ipip6_tunnel_create(dev) < 0)
		goto failed_free;

	return nt;

failed_free:
	free_netdev(dev);
failed:
	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
135
51.33%
4
18.18%
Stephen Hemminger
41
15.59%
1
4.55%
Pavel Emelyanov
33
12.55%
3
13.64%
Sascha Hlusiak
20
7.60%
2
9.09%
Eric Dumazet
13
4.94%
2
9.09%
Linus Torvalds
4
1.52%
1
4.55%
Hideaki Yoshifuji / 吉藤英明
4
1.52%
1
4.55%
David S. Miller
3
1.14%
2
9.09%
Patrick McHardy
3
1.14%
1
4.55%
Al Viro
2
0.76%
1
4.55%
Tom Gundersen
2
0.76%
1
4.55%
Stephen Rothwell
1
0.38%
1
4.55%
Nicolas Dichtel
1
0.38%
1
4.55%
Ian Morris
1
0.38%
1
4.55%
Total
263
100.00%
22
100.00%


#define for_each_prl_rcu(start)			\
	for (prl = rcu_dereference(start);      \
             prl;                               \
             prl = rcu_dereference(prl->next))


static struct ip_tunnel_prl_entry *

__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
{
	struct ip_tunnel_prl_entry *prl;

	for_each_prl_rcu(t->prl)
		if (prl->addr == addr)
			break;
	return prl;

}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred L. Templin
18
48.65%
1
16.67%
Linus Torvalds (pre-git)
11
29.73%
3
50.00%
Eric Dumazet
7
18.92%
1
16.67%
Hideaki Yoshifuji / 吉藤英明
1
2.70%
1
16.67%
Total
37
100.00%
6
100.00%



static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
				struct ip_tunnel_prl __user *a)
{
	struct ip_tunnel_prl kprl, *kp;
	struct ip_tunnel_prl_entry *prl;
	unsigned int cmax, c = 0, ca, len;
	int ret = 0;

	if (copy_from_user(&kprl, a, sizeof(kprl)))
		return -EFAULT;
	cmax = kprl.datalen / sizeof(kprl);
	if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
		cmax = 1;

	/* For simple GET or for root users,
         * we try harder to allocate.
         */
	kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
		kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) :
		NULL;

	rcu_read_lock();

	ca = t->prl_count < cmax ? t->prl_count : cmax;

	if (!kp) {
		/* We don't try hard to allocate much memory for
                 * non-root users.
                 * For root users, retry allocating enough memory for
                 * the answer.
                 */
		kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
		if (!kp) {
			ret = -ENOMEM;
			goto out;
		}
	}

	c = 0;
	for_each_prl_rcu(t->prl) {
		if (c >= cmax)
			break;
		if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
			continue;
		kp[c].addr = prl->addr;
		kp[c].flags = prl->flags;
		c++;
		if (kprl.addr != htonl(INADDR_ANY))
			break;
	}
out:
	rcu_read_unlock();

	len = sizeof(*kp) * c;
	ret = 0;
	if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
		ret = -EFAULT;

	kfree(kp);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hideaki Yoshifuji / 吉藤英明
303
96.50%
2
40.00%
Eric Dumazet
8
2.55%
1
20.00%
Américo Wang
2
0.64%
1
20.00%
Sascha Hlusiak
1
0.32%
1
20.00%
Total
314
100.00%
5
100.00%


static int

ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
{
	struct ip_tunnel_prl_entry *p;
	int err = 0;

	if (a->addr == htonl(INADDR_ANY))
		return -EINVAL;

	ASSERT_RTNL();

	for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
		if (p->addr == a->addr) {
			if (chg) {
				p->flags = a->flags;
				goto out;
			}
			err = -EEXIST;
			goto out;
		}
	}

	if (chg) {
		err = -ENXIO;
		goto out;
	}

	p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
	if (!p) {
		err = -ENOBUFS;
		goto out;
	}

	p->next = t->prl;
	p->addr = a->addr;
	p->flags = a->flags;
	t->prl_count++;
	rcu_assign_pointer(t->prl, p);
out:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hideaki Yoshifuji / 吉藤英明
65
33.68%
3
21.43%
Fred L. Templin
61
31.61%
1
7.14%
Eric Dumazet
36
18.65%
4
28.57%
Linus Torvalds (pre-git)
28
14.51%
4
28.57%
Kazunori Miyazawa
2
1.04%
1
7.14%
Stephen Rothwell
1
0.52%
1
7.14%
Total
193
100.00%
14
100.00%



static void prl_list_destroy_rcu(struct rcu_head *head)
{
	struct ip_tunnel_prl_entry *p, *n;

	p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
	do {
		n = rcu_dereference_protected(p->next, 1);
		kfree(p);
		p = n;
	} while (p);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
59
100.00%
2
100.00%
Total
59
100.00%
2
100.00%


static int

ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
{
	struct ip_tunnel_prl_entry *x;
	struct ip_tunnel_prl_entry __rcu **p;
	int err = 0;

	ASSERT_RTNL();

	if (a && a->addr != htonl(INADDR_ANY)) {
		for (p = &t->prl;
		     (x = rtnl_dereference(*p)) != NULL;
		     p = &x->next) {
			if (x->addr == a->addr) {
				*p = x->next;
				kfree_rcu(x, rcu_head);
				t->prl_count--;
				goto out;
			}
		}
		err = -ENXIO;
	} else {
		x = rtnl_dereference(t->prl);
		if (x) {
			t->prl_count = 0;
			call_rcu(&x->rcu_head, prl_list_destroy_rcu);
			t->prl = NULL;
		}
	}
out:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred L. Templin
79
47.88%
1
8.33%
Eric Dumazet
39
23.64%
3
25.00%
Hideaki Yoshifuji / 吉藤英明
31
18.79%
3
25.00%
Linus Torvalds (pre-git)
13
7.88%
3
25.00%
Paul E. McKenney
2
1.21%
1
8.33%
Sascha Hlusiak
1
0.61%
1
8.33%
Total
165
100.00%
12
100.00%


static int

isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
{
	struct ip_tunnel_prl_entry *p;
	int ok = 1;

	rcu_read_lock();
	p = __ipip6_tunnel_locate_prl(t, iph->saddr);
	if (p) {
		if (p->flags & PRL_DEFAULT)
			skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
		else
			skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
	} else {
		const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;

		if (ipv6_addr_is_isatap(addr6) &&
		    (addr6->s6_addr32[3] == iph->saddr) &&
		    ipv6_chk_prefix(addr6, t->dev))
			skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
		else
			ok = 0;
	}
	rcu_read_unlock();
	return ok;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred L. Templin
111
81.62%
1
14.29%
Hideaki Yoshifuji / 吉藤英明
12
8.82%
2
28.57%
Linus Torvalds (pre-git)
7
5.15%
2
28.57%
Eric Dumazet
6
4.41%
2
28.57%
Total
136
100.00%
7
100.00%



static void ipip6_tunnel_uninit(struct net_device *dev)
{
	struct ip_tunnel *tunnel = netdev_priv(dev);
	struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);

	if (dev == sitn->fb_tunnel_dev) {
		RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
	} else {
		ipip6_tunnel_unlink(sitn, tunnel);
		ipip6_tunnel_del_prl(tunnel, NULL);
	}
	dst_cache_reset(&tunnel->dst_cache);
	dev_put(dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred L. Templin
40
45.98%
1
9.09%
Pavel Emelyanov
26
29.89%
3
27.27%
Nicolas Dichtel
11
12.64%
2
18.18%
Paolo Abeni
4
4.60%
1
9.09%
Eric Dumazet
2
2.30%
1
9.09%
Linus Torvalds (pre-git)
2
2.30%
1
9.09%
Hideaki Yoshifuji / 吉藤英明
1
1.15%
1
9.09%
Stephen Hemminger
1
1.15%
1
9.09%
Total
87
100.00%
11
100.00%



static int ipip6_err(struct sk_buff *skb, u32 info)
{
	const struct iphdr *iph = (const struct iphdr *)skb->data;
	const int type = icmp_hdr(skb)->type;
	const int code = icmp_hdr(skb)->code;
	unsigned int data_len = 0;
	struct ip_tunnel *t;
	int sifindex;
	int err;

	switch (type) {
	default:
	case ICMP_PARAMETERPROB:
		return 0;

	case ICMP_DEST_UNREACH:
		switch (code) {
		case ICMP_SR_FAILED:
			/* Impossible event. */
			return 0;
		default:
			/* All others are translated to HOST_UNREACH.
                           rfc2003 contains "deep thoughts" about NET_UNREACH,
                           I believe they are just ether pollution. --ANK
                         */
			break;
		}
		break;
	case ICMP_TIME_EXCEEDED:
		if (code != ICMP_EXC_TTL)
			return 0;
		data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */
		break;
	case ICMP_REDIRECT:
		break;
	}

	err = -ENOENT;

	sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
	t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
				iph->daddr, iph->saddr, sifindex);
	if (!t)
		goto out;

	if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
		ipv4_update_pmtu(skb, dev_net(skb->dev), info,
				 t->parms.link, 0, iph->protocol, 0);
		err = 0;
		goto out;
	}
	if (type == ICMP_REDIRECT) {
		ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
			      iph->protocol, 0);
		err = 0;
		goto out;
	}

	err = 0;
	if (!ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len))
		goto out;

	if (t->parms.iph.daddr == 0)
		goto out;

	if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
		goto out;

	if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
		t->err_count++;
	else
		t->err_count = 1;
	t->err_time = jiffies;
out:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fred L. Templin
99
26.33%
1
4.35%
David S. Miller
84
22.34%
2
8.70%
Linus Torvalds (pre-git)
65
17.29%
4
17.39%
Eric Dumazet
51
13.56%
4
17.39%
David Ahern
23
6.12%
1
4.35%
Oussama Ghorbel
10
2.66%
1
4.35%
Arnaldo Carvalho de Melo
8
2.13%
1
4.35%
Pavel Emelyanov
7
1.86%
2
8.70%
Simon Horman
6
1.60%
1
4.35%
Dmitry Popov
6
1.60%
1
4.35%
Wei Yongjun
5
1.33%
1
4.35%
Kazunori Miyazawa
5
1.33%
1
4.35%
Sascha Hlusiak
4
1.06%
1
4.35%
Patrick McHardy
2
0.53%
1
4.35%
Ian Morris
1
0.27%
1
4.35%
Total
376
100.00%
23
100.00%



static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
				  const struct in6_addr *v6addr)
{
	__be32 v4embed = 0;
	if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
		return true;
	return false;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hannes Frederic Sowa
49
100.00%
1
100.00%
Total
49
100.00%
1
100.00%

/* Checks if an address matches an address on the tunnel interface.
 * Used to detect the NAT of proto 41 packets and let them pass spoofing test.
 * Long story:
 * This function is called after we considered the packet as spoofed
 * in is_spoofed_6rd.
 * We may have a router that is doing NAT for proto 41 packets
 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb
 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd
 * function will return true, dropping the packet.
 * But, we can still check if is spoofed against the IP
 * addresses associated with the interface.
 */


static bool only_dnatted(const struct ip_tunnel *tunnel,
	const struct in6_addr *v6dst)
{
	int prefix_len;

#ifdef CONFIG_IPV6_SIT_6RD
	prefix_len = tunnel->ip6rd.prefixlen + 32
		- tunnel->ip6rd.relay_prefixlen;
#else
	prefix_len = 48;
#endif
	return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Catalin(ux aka Dino) M. Boie
60
100.00%
1
100.00%
Total
60
100.00%
1
100.00%

/* Returns true if a packet is spoofed */


static bool packet_is_spoofed(struct sk_buff *skb,
			      const struct iphdr *iph,
			      struct ip_tunnel *tunnel)
{
	const struct ipv6hdr *ipv6h;

	if (tunnel->dev->priv_flags & IFF_ISATAP) {
		if (!isatap_chksrc(skb, iph, tunnel))
			return true;

		return false;
	}

	if (tunnel->dev->flags & IFF_POINTOPOINT)
		return false;

	ipv6h = ipv6_hdr(skb);

	if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) {
		net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
				     &iph->saddr, &ipv6h->saddr,
				     &iph->daddr, &ipv6h->daddr);
		return true;
	}

	if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr)))
		return false;

	if (only_dnatted(tunnel, &ipv6h->daddr))
		return false;

	net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n",
			     &iph->saddr, &ipv6h->saddr,
			     &iph->daddr, &ipv6h->daddr);
	return true;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Catalin(ux aka Dino) M. Boie
193
100.00%
1
100.00%
Total
193
100.00%
1
100.00%



static int ipip6_rcv(struct sk_buff *skb)
{
	const struct iphdr *iph = ip_hdr(skb);
	struct ip_tunnel *tunnel;
	int sifindex;
	int err;

	sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;
	tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
				     iph->saddr, iph->daddr, sifindex);
	if (tunnel) {
		struct pcpu_sw_netstats *tstats;

		if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
		    tunnel->parms.iph.protocol != 0)
			goto out;

		skb->mac_header = skb->network_header;
		skb_reset_network_header(skb);
		IPCB(skb)->flags = 0;
		skb->dev = tunnel->dev;

		if (packet_is_spoofed(skb, iph, tunnel)) {
			tunnel->dev->stats.rx_errors++;
			goto out;
		}

		if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6),
		    !net_eq(tunnel->net, dev_net(tunnel->dev))))
			goto out;

		err = IP_ECN_decapsulate(iph, skb);
		if (unlikely(err)) {
			if (log_ecn_error)
				net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
						     &iph->saddr, iph->tos);
			if (err > 1) {
				++tunnel->dev->stats.rx_frame_errors;
				++tunnel->dev->stats.rx_errors;
				goto out;
			}
		}

		tstats = this_cpu_ptr(tunnel->dev->tstats);
		u64_stats_update_begin(&tstats->syncp);
		tstats->rx_packets++;
		tstats->rx_bytes += skb->len;
		u64_stats_update_end(&tstats->syncp);

		netif_rx(skb);

		return 0;
	}

	/* no tunnel matched,  let upstream know, ipsec may handle it */
	return 1;
out:
	kfree_skb(skb);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
102
31.19%
3
10.71%
Linus Torvalds (pre-git)
56
17.13%
4
14.29%
Eric Dumazet
29
8.87%
2
7.14%
Jesse Gross
27
8.26%
1
3.57%
David Ahern
23
7.03%
1
3.57%
Fred L. Templin
21
6.42%
1
3.57%
Li RongQing
17
5.20%
2
7.14%
Pavel Emelyanov
10
3.06%
3
10.71%
Patrick McHardy
9
2.75%
1
3.57%
Sascha Hlusiak
8
2.45%
1
3.57%
Hannes Frederic Sowa
5
1.53%
1
3.57%
David S. Miller
5
1.53%
1
3.57%
Arnaldo Carvalho de Melo
5
1.53%
2
7.14%
David McCullough
4
1.22%
1
3.57%
Herbert Xu
2
0.61%
1
3.57%
Linus Torvalds
2
0.61%
1
3.57%
Stephen Rothwell
1
0.31%
1
3.57%
Catalin(ux aka Dino) M. Boie
1
0.31%
1
3.57%
Total
327
100.00%
28
100.00%


static const struct tnl_ptk_info ipip_tpi = {
	/* no tunnel info required for ipip. */
	.proto = htons(ETH_P_IP),
};

#if IS_ENABLED(CONFIG_MPLS)

static const struct tnl_ptk_info mplsip_tpi = {
	/* no tunnel info required for mplsip. */
	.proto = htons(ETH_P_MPLS_UC),
};
#endif



static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
{
	const struct iphdr *iph;
	struct ip_tunnel *tunnel;
	int sifindex;

	sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0;

	iph = ip_hdr(skb);
	tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
				     iph->saddr, iph->daddr, sifindex);
	if (tunnel) {
		const struct tnl_ptk_info *tpi;

		if (tunnel->parms.iph.protocol != ipproto &&
		    tunnel->parms.iph.protocol != 0)
			goto drop;

		if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
			goto drop;
#if IS_ENABLED(CONFIG_MPLS)
		if (ipproto == IPPROTO_MPLS)
			tpi = &mplsip_tpi;
		else
#endif
			tpi = &ipip_tpi;
		if (iptunnel_pull_header(skb, 0, tpi->proto, false))
			goto drop;
		return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
	}

	return 1;

drop:
	kfree_skb(skb);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
115
57.21%
1
14.29%
Simon Horman
37
18.41%
1
14.29%
David Ahern
23
11.44%
1
14.29%
Li Hongjun
15
7.46%
1
14.29%
Pravin B Shelar
9
4.48%
2
28.57%
Jiri Benc
2
1.00%
1
14.29%
Total
201
100.00%
7
100.00%



static int ipip_rcv(struct sk_buff *skb)
{
	return sit_tunnel_rcv(skb, IPPROTO_IPIP);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Simon Horman
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%

#if IS_ENABLED(CONFIG_MPLS)


static int mplsip_rcv(struct sk_buff *skb)
{
	return sit_tunnel_rcv(skb, IPPROTO_MPLS);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Simon Horman
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%

#endif

/*
 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
 * stores the embedded IPv4 address in v4dst and returns true.
 */


static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
		      __be32 *v4dst)
{
#ifdef CONFIG_IPV6_SIT_6RD
	if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
			      tunnel->ip6rd.prefixlen)) {
		unsigned int pbw0, pbi0;
		int pbi1;
		u32 d;

		pbw0 = tunnel->ip6rd.prefixlen >> 5;
		pbi0 = tunnel->ip6rd.prefixlen & 0x1f;

		d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
		    tunnel->ip6rd.relay_prefixlen;

		pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
		if (pbi1 > 0)
			d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
			     (32 - pbi1);

		*v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
		return true;
	}
#else
	if (v6dst->s6_addr16[0] == htons(0x2002)) {
		/* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
		memcpy(v4dst, &v6dst->s6_addr16[1], 4);
		return true;
	}
#endif
	return false;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hideaki Yoshifuji / 吉藤英明
132
67.69%
2
33.33%
Linus Torvalds (pre-git)
40
20.51%
1
16.67%
Hannes Frederic Sowa
21
10.77%
1
16.67%
Eric Dumazet
2
1.03%
2
33.33%
Total
195
100.00%
6
100.00%



static inline __be32 try_6rd(struct ip_tunnel *tunnel,
			     const struct in6_addr *v6dst)
{
	__be32 dst = 0;
	check_6rd(tunnel, v6dst, &dst);
	return dst;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hannes Frederic Sowa
33
91.67%
1
50.00%
Linus Torvalds (pre-git)
3
8.33%
1
50.00%
Total
36
100.00%
2
100.00%

/*
 *      This function assumes it is being called from dev_queue_xmit()
 *      and that skb is filled properly by that function.
 */



static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
				     struct net_device *dev)
{
	struct ip_tunnel *tunnel = netdev_priv(dev);
	const struct iphdr  *tiph = &tunnel->parms.iph;
	const struct ipv6hdr *iph6 = ipv6_hdr(skb);
	u8     tos = tunnel->parms.iph.tos;
	__be16 df = tiph->frag_off;
	struct rtable *rt;		/* Route to the other host */
	struct net_device *tdev;	/* Device to other host */
	unsigned int max_headroom;	/* The extra header space needed */
	__be32 dst = tiph->daddr;
	struct flowi4 fl4;
	int    mtu;
	const struct in6_addr *addr6;
	int addr_type;
	u8 ttl;
	u8 protocol = IPPROTO_IPV6;
	int t_hlen = tunnel->hlen + sizeof(struct iphdr);

	if (tos == 1)
		tos = ipv6_get_dsfield(iph6);

	/* ISATAP (RFC4214) - must come before 6to4 */
	if (dev->priv_flags & IFF_ISATAP) {
		struct neighbour *neigh = NULL;
		bool do_tx_error = false;

		if (skb_dst(skb))
			neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);

		if (!neigh) {
			net_dbg_ratelimited("nexthop == NULL\n");
			goto tx_error;
		}

		addr6 = (const struct in6_addr *)&neigh->primary_key;
		addr_type = ipv6_addr_type(addr6);

		if ((addr_type & IPV6_ADDR_UNICAST) &&
		     ipv6_addr_is_isatap(addr6))
			dst = addr6->s6_addr32[3];
		else
			do_tx_error = true;

		neigh_release(neigh);
		if (do_tx_error)
			goto tx_error;
	}

	if (!dst)
		dst = try_6rd(tunnel, &iph6->daddr);

	if (!dst) {
		struct neighbour *neigh = NULL;
		bool do_tx_error = false;

		if (skb_dst(skb))
			neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);

		if (!neigh) {
			net_dbg_ratelimited("nexthop == NULL\n");
			goto tx_error;
		}

		addr6 = (const struct in6_addr *)&neigh->primary_key;
		addr_type = ipv6_addr_type(addr6);

		if (addr_type == IPV6_ADDR_ANY) {
			addr6 = &ipv6_hdr(skb)->daddr;
			addr_type = ipv6_addr_type(addr6);
		}

		if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
			dst = addr6->s6_addr32[3];
		else
			do_tx_error = true;

		neigh_release(neigh);
		if (do_tx_error)
			goto tx_error;
	}

	flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark,
			   RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6,
			   0, dst, tiph->saddr, 0, 0,
			   sock_net_uid(tunnel->net, NULL));
	rt = ip_route_output_flow(tunnel->net, &fl4, NULL);

	if (IS_ERR(rt)) {
		dev->stats.tx_carrier_errors++;
		goto tx_error_icmp;
	}
	if (rt->rt_type != RTN_UNICAST) {
		ip_rt_put(rt);
		dev->stats.tx_carrier_errors++;
		goto tx_error_icmp;
	}
	tdev = rt->dst.dev;

	if (tdev == dev) {
		ip_rt_put(rt);
		dev->stats.collisions++;
		goto tx_error;
	}

	if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) {
		ip_rt_put(rt);
		goto tx_error;
	}

	if (df) {
		mtu = dst_mtu(&rt->dst) - t_hlen;

		if (mtu < 68) {
			dev->stats.collisions++;
			ip_rt_put(rt);
			goto tx_error;
		}

		if (mtu < IPV6_MIN_MTU) {
			mtu = IPV6_MIN_MTU;
			df = 0;
		}

		if (tunnel->parms.iph.daddr)
			skb_dst_update_pmtu(skb, mtu);

		if (skb->len > mtu && !skb_is_gso(skb)) {
			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
			ip_rt_put(rt);
			goto tx_error;
		}
	}

	if (tunnel->err_count > 0) {
		if (time_before(jiffies,
				tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
			tunnel->err_count--;
			dst_link_failure(skb);
		} else
			tunnel->err_count = 0;
	}

	/*
         * Okay, now see if we can stuff it in the buffer as-is.
         */
	max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen;

	if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
	    (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
		struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
		if (!new_skb) {
			ip_rt_put(rt);
			dev->stats.tx_dropped++;
			kfree_skb(skb);
			return NETDEV_TX_OK;
		}
		if (skb->sk)
			skb_set_owner_w(new_skb, skb->sk);
		dev_kfree_skb(skb);
		skb = new_skb;
		iph6 = ipv6_hdr(skb);
	}
	ttl = tiph->ttl;
	if (ttl == 0)
		ttl = iph6->hop_limit;
	tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));

	if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) {
		ip_rt_put(rt);
		goto tx_error;
	}

	skb_set_inner_ipproto(skb, IPPROTO_IPV6);

	iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl,
		      df, !net_eq(tunnel->net, dev_net(dev)));
	return NETDEV_TX_OK;

tx_error_icmp:
	dst_link_failure(skb);
tx_error:
	kfree_skb(skb);
	dev->stats.tx_errors++;
	return NETDEV_TX_OK;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
482
50.21%
9
14.52%
David S. Miller
85
8.85%
7
11.29%
Fred L. Templin
83
8.65%
1
1.61%
Tom Herbert
56
5.83%
3
4.84%
Eric Dumazet
54
5.62%
7
11.29%
Craig Gallek
38
3.96%
1
1.61%
Pravin B Shelar
27
2.81%
1
1.61%
Patrick McHardy
19
1.98%
4
6.45%
Herbert Xu
18
1.88%
3
4.84%
Alexey Kuznetsov
17
1.77%
3
4.84%
Nicolas Dichtel
16
1.67%
3
4.84%
Lionel Elie Mamane
11
1.15%
1
1.61%
Arnaldo Carvalho de Melo
9
0.94%
1
1.61%
Li RongQing
7
0.73%
1
1.61%
Hideaki Yoshifuji / 吉藤英明
6
0.62%
2
3.23%
Wei Yongjun
5
0.52%
1
1.61%
Julian Anastasov
5
0.52%
2
3.23%
Américo Wang
4
0.42%
1
1.61%
Hannes Frederic Sowa
4
0.42%
3
4.84%
Alexander Duyck
3
0.31%
1
1.61%
Catalin(ux aka Dino) M. Boie
2
0.21%
1
1.61%
Joe Perches
2
0.21%
1
1.61%
Gao Feng
2
0.21%
1
1.61%
Ian Morris
2
0.21%
1
1.61%
Al Viro
1
0.10%
1
1.61%
Stephen Hemminger
1
0.10%
1
1.61%
Chuck Lever
1
0.10%
1
1.61%
Total
960
100.00%
62
100.00%



static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb,
				     struct net_device *dev, u8 ipproto)
{
	struct ip_tunnel *tunnel = netdev_priv(dev);
	const struct iphdr  *tiph = &tunnel->parms.iph;

	if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
		goto tx_error;

	skb_set_inner_ipproto(skb, ipproto);

	ip_tunnel_xmit(skb, dev, tiph, ipproto);
	return NETDEV_TX_OK;
tx_error:
	kfree_skb(skb);
	dev->stats.tx_errors++;
	return NETDEV_TX_OK;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
54
58.70%
1
16.67%
Eric Dumazet
16
17.39%
1
16.67%
Alexander Duyck
9
9.78%
1
16.67%
Tom Herbert
7
7.61%
2
33.33%
Simon Horman
6
6.52%
1
16.67%
Total
92
100.00%
6
100.00%



static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
				   struct net_device *dev)
{
	switch (skb->protocol) {
	case htons(ETH_P_IP):
		sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP);
		break;
	case htons(ETH_P_IPV6):
		ipip6_tunnel_xmit(skb, dev);
		break;
#if IS_ENABLED(CONFIG_MPLS)
	case htons(ETH_P_MPLS_UC):
		sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS);
		break;
#endif
	default:
		goto tx_err;
	}

	return NETDEV_TX_OK;

tx_err:
	dev->stats.tx_errors++;
	kfree_skb(skb);
	return NETDEV_TX_OK;

}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
74
72.55%
1
33.33%
Simon Horman
27
26.47%
1
33.33%
Gao Feng
1
0.98%
1
33.33%
Total
102
100.00%
3
100.00%



static void ipip6_tunnel_bind_dev(struct net_device *dev)
{
	struct net_device *tdev = NULL;
	struct ip_tunnel *tunnel;
	const struct iphdr *iph;
	struct flowi4 fl4;

	tunnel = netdev_priv(dev);
	iph = &tunnel->parms.iph;

	if (iph->daddr) {
		struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
							  NULL,
							  iph->daddr, iph->saddr,
							  0, 0,
							  IPPROTO_IPV6,
							  RT_TOS(iph->tos),
							  tunnel->parms.link);

		if (!IS_ERR(rt)) {
			tdev = rt->dst.dev;
			ip_rt_put(rt);
		}
		dev->flags |= IFF_POINTOPOINT;
	}

	if (!tdev && tunnel->parms.link)
		tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);

	if (tdev) {
		int t_hlen = tunnel->hlen + sizeof(struct iphdr);

		dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
		dev->mtu = tdev->mtu - t_hlen;
		if (dev->mtu < IPV6_MIN_MTU)
			dev->mtu = IPV6_MIN_MTU;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Michal Schmidt
157
73.71%
1
12.50%
David S. Miller
32
15.02%
3
37.50%
Tom Herbert
14
6.57%
1
12.50%
Nicolas Dichtel
6
2.82%
1
12.50%
Changli Gao
3
1.41%
1
12.50%
Eric Dumazet
1
0.47%
1
12.50%
Total
213
100.00%
8
100.00%



static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p,
				__u32 fwmark)
{
	struct net *net = t->net;
	struct sit_net *sitn = net_generic(net, sit_net_id);

	ipip6_tunnel_unlink(sitn, t);
	synchronize_net();
	t->parms.iph.saddr = p->iph.saddr;
	t->parms.iph.daddr = p->iph.daddr;
	memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
	memcpy(t->dev->broadcast, &p->iph.daddr, 4);
	ipip6_tunnel_link(sitn, t);
	t->parms.iph.ttl = p->iph.ttl;
	t->parms.iph.tos = p->iph.tos;
	t->parms.iph.frag_off = p->iph.frag_off;
	if (t->parms.link != p->link || t->fwmark != fwmark) {
		t->parms.link = p->link;
		t->fwmark = fwmark;
		ipip6_tunnel_bind_dev(t->dev);
	}
	dst_cache_reset(&t->dst_cache);
	netdev_state_change(t->dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
161
72.85%
3
37.50%
Pavel Emelyanov
18
8.14%
1
12.50%
Craig Gallek
15
6.79%
1
12.50%
Hangbin Liu
14
6.33%
1
12.50%
Linus Torvalds (pre-git)
9
4.07%
1
12.50%
Paolo Abeni
4
1.81%
1
12.50%
Total
221
100.00%
8
100.00%

#ifdef CONFIG_IPV6_SIT_6RD


static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
				   struct ip_tunnel_6rd *ip6rd)
{
	struct in6_addr prefix;
	__be32 relay_prefix;

	if (ip6rd->relay_prefixlen > 32 ||
	    ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
		return -EINVAL;

	ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
	if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
		return -EINVAL;
	if (ip6rd->relay_prefixlen)
		relay_prefix = ip6rd->relay_prefix &
			       htonl(0xffffffffUL <<
				     (32 - ip6rd->relay_prefixlen));
	else
		relay_prefix = 0;
	if (relay_prefix != ip6rd->relay_prefix)
		return -EINVAL;

	t->ip6rd.prefix = prefix;
	t->ip6rd.relay_prefix = relay_prefix;
	t->ip6rd.prefixlen = ip6rd->prefixlen;
	t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
	dst_cache_reset(&t->dst_cache);
	netdev_state_change(t->dev);
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
174
97.75%
2
66.67%
Paolo Abeni
4
2.25%
1
33.33%
Total
178
100.00%
3
100.00%

#endif



static bool ipip6_valid_ip_proto(u8 ipproto)
{
	return ipproto == IPPROTO_IPV6 ||
		ipproto == IPPROTO_IPIP ||
#if IS_ENABLED(CONFIG_MPLS)
		ipproto == IPPROTO_MPLS ||
#endif
		ipproto == 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Simon Horman
33
97.06%
1
50.00%
Wei Yongjun
1
2.94%
1
50.00%
Total
34
100.00%
2
100.00%


static int

ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	int err = 0;
	struct ip_tunnel_parm p;
	struct ip_tunnel_prl prl;
	struct ip_tunnel *t = netdev_priv(dev);
	struct net *net = t->net;
	struct sit_net *sitn = net_generic(net, sit_net_id);
#ifdef CONFIG_IPV6_SIT_6RD
	struct ip_tunnel_6rd ip6rd;
#endif

	switch (cmd) {
	case SIOCGETTUNNEL:
#ifdef CONFIG_IPV6_SIT_6RD
	case SIOCGET6RD:
#endif
		if (dev == sitn->fb_tunnel_dev) {
			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
				err = -EFAULT;
				break;
			}
			t = ipip6_tunnel_locate(net, &p, 0);
			if (!t)
				t = netdev_priv(dev);
		}

		err = -EFAULT;
		if (cmd == SIOCGETTUNNEL) {
			memcpy(&p, &t->parms, sizeof(p));
			if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
					 sizeof(p)))
				goto done;
#ifdef CONFIG_IPV6_SIT_6RD
		} else {
			ip6rd.prefix = t->ip6rd.prefix;
			ip6rd.relay_prefix = t->ip6rd.relay_prefix;
			ip6rd.prefixlen = t->ip6rd.prefixlen;
			ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
			if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
					 sizeof(ip6rd)))
				goto done;
#endif
		}
		err = 0;
		break;

	case SIOCADDTUNNEL:
	case SIOCCHGTUNNEL:
		err = -EPERM;
		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
			goto done;

		err = -EFAULT;
		if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
			goto done;

		err = -EINVAL;
		if (!ipip6_valid_ip_proto(p.iph.protocol))
			goto done;
		if (p.iph.version != 4 ||
		    p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
			goto done;
		if (p.iph.ttl)
			p.iph.frag_off |= htons(IP_DF);

		t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);

		if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
			if (t) {
				if (t->dev != dev) {
					err = -EEXIST;
					break;
				}
			} else {
				if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
				    (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
					err = -EINVAL;
					break;
				}
				t = netdev_priv(dev);
			}

			ipip6_tunnel_update(t, &p, t->fwmark);
		}

		if (t) {
			err = 0;
			if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
				err = -EFAULT;
		} else
			err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
		break;

	case SIOCDELTUNNEL:
		err = -EPERM;
		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
			goto done;

		if (dev == sitn->fb_tunnel_dev) {
			err = -EFAULT;
			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
				goto done;
			err = -ENOENT;
			t = ipip6_tunnel_locate(net, &p, 0);
			if (!t)
				goto done;
			err = -EPERM;
			if (t == netdev_priv(sitn->fb_tunnel_dev))
				goto done;
			dev = t->dev;
		}
		unregister_netdevice(dev);
		err = 0;
		break;

	case SIOCGETPRL:
		err = -EINVAL;
		if (dev == sitn->fb_tunnel_dev)
			goto done;
		err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
		break;

	case SIOCADDPRL:
	case SIOCDELPRL:
	case SIOCCHGPRL:
		err = -EPERM;
		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
			goto done;
		err = -EINVAL;
		if (dev == sitn->fb_tunnel_dev)
			goto done;
		err = -EFAULT;
		if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
			goto done;

		switch (cmd) {
		case SIOCDELPRL:
			err = ipip6_tunnel_del_prl(t, &prl);
			break;
		case SIOCADDPRL:
		case SIOCCHGPRL:
			err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
			break;
		}
		dst_cache_reset(&t->dst_cache);
		netdev_state_change(dev);
		break;

#ifdef CONFIG_IPV6_SIT_6RD
	case SIOCADD6RD:
	case SIOCCHG6RD:
	case SIOCDEL6RD:
		err = -EPERM;
		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
			goto done;

		err = -EFAULT;
		if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
				   sizeof(ip6rd)))
			goto done;

		if (cmd != SIOCDEL6RD) {
			err = ipip6_tunnel_update_6rd(t, &ip6rd);
			if (err < 0)
				goto done;
		} else
			ipip6_tunnel_clone_6rd(dev, sitn);

		err = 0;
		break;
#endif

	default:
		err = -EINVAL;
	}

done:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
438
45.48%
5
17.24%
Hideaki Yoshifuji / 吉藤英明
231
23.99%
5
17.24%
Nicolas Dichtel
118
12.25%
6
20.69%
Fred L. Templin
97
10.07%
1
3.45%
Pavel Emelyanov
21
2.18%
2
6.90%
Eric W. Biedermann
20
2.08%
1
3.45%
Patrick McHardy
9
0.93%
1
3.45%
Ian Morris
6
0.62%
2
6.90%
Linus Torvalds
6
0.62%
1
3.45%
Simon Horman
4
0.42%
1
3.45%
Stephen Hemminger
4
0.42%
1
3.45%
Craig Gallek
4
0.42%
1
3.45%
Paolo Abeni
4
0.42%
1
3.45%
Alexey Dobriyan
1
0.10%
1
3.45%
Total
963
100.00%
29
100.00%


static const struct net_device_ops ipip6_netdev_ops = {
	.ndo_init	= ipip6_tunnel_init,
	.ndo_uninit	= ipip6_tunnel_uninit,
	.ndo_start_xmit	= sit_tunnel_xmit,
	.ndo_do_ioctl	= ipip6_tunnel_ioctl,
	.ndo_get_stats64 = ip_tunnel_get_stats64,
	.ndo_get_iflink = ip_tunnel_get_iflink,
};



static void ipip6_dev_free(struct net_device *dev)
{
	struct ip_tunnel *tunnel = netdev_priv(dev);

	dst_cache_destroy(&tunnel->dst_cache);
	free_percpu(dev->tstats);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
18
50.00%
1
33.33%
Nicolas Dichtel
16
44.44%
1
33.33%
Paolo Abeni
2
5.56%
1
33.33%
Total
36
100.00%
3
100.00%


#define SIT_FEATURES (NETIF_F_SG        | \
                      NETIF_F_FRAGLIST     | \
                      NETIF_F_HIGHDMA      | \
                      NETIF_F_GSO_SOFTWARE | \
                      NETIF_F_HW_CSUM)



static void ipip6_tunnel_setup(struct net_device *dev)
{
	struct ip_tunnel *tunnel = netdev_priv(dev);
	int t_hlen = tunnel->hlen + sizeof(struct iphdr);

	dev->netdev_ops		= &ipip6_netdev_ops;
	dev->needs_free_netdev	= true;
	dev->priv_destructor	= ipip6_dev_free;

	dev->type		= ARPHRD_SIT;
	dev->hard_header_len	= LL_MAX_HEADER + t_hlen;
	dev->mtu		= ETH_DATA_LEN - t_hlen;
	dev->min_mtu		= IPV6_MIN_MTU;
	dev->max_mtu		= 0xFFF8 - t_hlen;
	dev->flags		= IFF_NOARP;
	netif_keep_dst(dev);
	dev->addr_len		= 4;
	dev->features		|= NETIF_F_LLTX;
	dev->features		|= SIT_FEATURES;
	dev->hw_features	|= SIT_FEATURES;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
48
38.71%
4
25.00%
Tom Herbert
25
20.16%
1
6.25%
Eric Dumazet
18
14.52%
4
25.00%
Jarod Wilson
14
11.29%
1
6.25%
David S. Miller
7
5.65%
1
6.25%
Pavel Emelyanov
4
3.23%
1
6.25%
Stephen Hemminger
4
3.23%
2
12.50%
Sascha Hlusiak
3
2.42%
1
6.25%
Kris Katterjohn
1
0.81%
1
6.25%
Total
124
100.00%
16
100.00%



static int ipip6_tunnel_init(struct net_device *dev)
{
	struct ip_tunnel *tunnel = netdev_priv(dev);
	int err;

	tunnel->dev = dev;
	tunnel->net = dev_net(dev);
	strcpy(tunnel->parms.name, dev->name);

	ipip6_tunnel_bind_dev(dev);
	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
	if (!dev->tstats)
		return -ENOMEM;

	err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
	if (err) {
		free_percpu(dev->tstats);
		dev->tstats = NULL;
		return err;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
28
24.35%
2
13.33%
Eric Dumazet
23
20.00%
1
6.67%
Linus Torvalds (pre-git)
22
19.13%
3
20.00%
Stephen Hemminger
15
13.04%
2
13.33%
Paolo Abeni
12
10.43%
1
6.67%
Américo Wang
7
6.09%
2
13.33%
Patrick McHardy
3
2.61%
1
6.67%
Steffen Klassert
3
2.61%
1
6.67%
Michal Schmidt
1
0.87%
1
6.67%
Li RongQing
1
0.87%
1
6.67%
Total
115
100.00%
15
100.00%



static void __net_init ipip6_fb_tunnel_init(struct net_device *dev)
{
	struct ip_tunnel *tunnel = netdev_priv(dev);
	struct iphdr *iph = &tunnel->parms.iph;
	struct net *net = dev_net(dev);
	struct sit_net *sitn = net_generic(net, sit_net_id);

	iph->version		= 4;
	iph->protocol		= IPPROTO_IPV6;
	iph->ihl		= 5;
	iph->ttl		= 64;

	dev_hold(dev);
	rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
51
52.58%
4
33.33%
Pavel Emelyanov
24
24.74%
1
8.33%
Stephen Hemminger
12
12.37%
1
8.33%
Eric Dumazet
5
5.15%
3
25.00%
Patrick McHardy
3
3.09%
1
8.33%
Alexey Dobriyan
1
1.03%
1
8.33%
Arnaldo Carvalho de Melo
1
1.03%
1
8.33%
Total
97
100.00%
12
100.00%



static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[],
			  struct netlink_ext_ack *extack)
{
	u8 proto;

	if (!data || !data[IFLA_IPTUN_PROTO])
		return 0;

	proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
	if (!ipip6_valid_ip_proto(proto))
		return -EINVAL;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
56
86.15%
2
50.00%
Matthias Schiffer
5
7.69%
1
25.00%
Simon Horman
4
6.15%
1
25.00%
Total
65
100.00%
4
100.00%



static void ipip6_netlink_parms(struct nlattr *data[],
				struct ip_tunnel_parm *parms,
				__u32 *fwmark)
{
	memset(parms, 0, sizeof(*parms));

	parms->iph.version = 4;
	parms->iph.protocol = IPPROTO_IPV6;
	parms->iph.ihl = 5;
	parms->iph.ttl = 64;

	if (!data)
		return;

	if (data[IFLA_IPTUN_LINK])
		parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);

	if (data[IFLA_IPTUN_LOCAL])
		parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);

	if (data[IFLA_IPTUN_REMOTE])
		parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);

	if (data[IFLA_IPTUN_TTL]) {
		parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
		if (parms->iph.ttl)
			parms->iph.frag_off = htons(IP_DF);
	}

	if (data[IFLA_IPTUN_TOS])
		parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);

	if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
		parms->iph.frag_off = htons(IP_DF);

	if (data[IFLA_IPTUN_FLAGS])
		parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);

	if (data[IFLA_IPTUN_PROTO])
		parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);

	if (data[IFLA_IPTUN_FWMARK])
		*fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
259
92.17%
4
80.00%
Craig Gallek
22
7.83%
1
20.00%
Total
281
100.00%
5
100.00%

/* This function returns true when ENCAP attributes are present in the nl msg */


static bool ipip6_netlink_encap_parms(struct nlattr *data[],
				      struct ip_tunnel_encap *ipencap)
{
	bool ret = false;

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

	if (!data)
		return ret;

	if (data[IFLA_IPTUN_ENCAP_TYPE]) {
		ret = true;
		ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
	}

	if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
		ret = true;
		ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
	}

	if (data[IFLA_IPTUN_ENCAP_SPORT]) {
		ret = true;
		ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
	}

	if (data[IFLA_IPTUN_ENCAP_DPORT]) {
		ret = true;
		ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
	}

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tom Herbert
144
98.63%
1
50.00%
Eric Dumazet
2
1.37%
1
50.00%
Total
146
100.00%
2
100.00%

#ifdef CONFIG_IPV6_SIT_6RD
/* This function returns true when 6RD attributes are present in the nl msg */


static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
				    struct ip_tunnel_6rd *ip6rd)
{
	bool ret = false;
	memset(ip6rd, 0, sizeof(*ip6rd));

	if (!data)
		return ret;

	if (data[IFLA_IPTUN_6RD_PREFIX]) {
		ret = true;
		ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]);
	}

	if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
		ret = true;
		ip6rd->relay_prefix =
			nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
	}

	if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
		ret = true;
		ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
	}

	if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
		ret = true;
		ip6rd->relay_prefixlen =
			nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
	}

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
143
97.95%
1
50.00%
Jiri Benc
3
2.05%
1
50.00%
Total
146
100.00%
2
100.00%

#endif



static int ipip6_newlink(struct net *src_net, struct net_device *dev,
			 struct nlattr *tb[], struct nlattr *data[],
			 struct netlink_ext_ack *extack)
{
	struct net *net = dev_net(dev);
	struct ip_tunnel *nt;
	struct ip_tunnel_encap ipencap;
#ifdef CONFIG_IPV6_SIT_6RD
	struct ip_tunnel_6rd ip6rd;
#endif
	int err;

	nt = netdev_priv(dev);

	if (ipip6_netlink_encap_parms(data, &ipencap)) {
		err = ip_tunnel_encap_setup(nt, &ipencap);
		if (err < 0)
			return err;
	}

	ipip6_netlink_parms(data, &nt->parms, &nt->fwmark);

	if (ipip6_tunnel_locate(net, &nt->parms, 0))
		return -EEXIST;

	err = ipip6_tunnel_create(dev);
	if (err < 0)
		return err;

#ifdef CONFIG_IPV6_SIT_6RD
	if (ipip6_netlink_6rd_parms(data, &ip6rd))
		err = ipip6_tunnel_update_6rd(nt, &ip6rd);
#endif

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
134
74.86%
2
40.00%
Tom Herbert
35
19.55%
1
20.00%
Craig Gallek
5
2.79%
1
20.00%
Matthias Schiffer
5
2.79%
1
20.00%
Total
179
100.00%
5
100.00%



static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
			    struct nlattr *data[],
			    struct netlink_ext_ack *extack)
{
	struct ip_tunnel *t = netdev_priv(dev);
	struct ip_tunnel_parm p;
	struct ip_tunnel_encap ipencap;
	struct net *net = t->net;
	struct sit_net *sitn = net_generic(net, sit_net_id);
#ifdef CONFIG_IPV6_SIT_6RD
	struct ip_tunnel_6rd ip6rd;
#endif
	__u32 fwmark = t->fwmark;
	int err;

	if (dev == sitn->fb_tunnel_dev)
		return -EINVAL;

	if (ipip6_netlink_encap_parms(data, &ipencap)) {
		err = ip_tunnel_encap_setup(t, &ipencap);
		if (err < 0)
			return err;
	}

	ipip6_netlink_parms(data, &p, &fwmark);

	if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
	    (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
		return -EINVAL;

	t = ipip6_tunnel_locate(net, &p, 0);

	if (t) {
		if (t->dev != dev)
			return -EEXIST;
	} else
		t = netdev_priv(dev);

	ipip6_tunnel_update(t, &p, fwmark);

#ifdef CONFIG_IPV6_SIT_6RD
	if (ipip6_netlink_6rd_parms(data, &ip6rd))
		return ipip6_tunnel_update_6rd(t, &ip6rd);
#endif

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
200
78.43%
3
50.00%
Tom Herbert
38
14.90%
1
16.67%
Craig Gallek
12
4.71%
1
16.67%
Matthias Schiffer
5
1.96%
1
16.67%
Total
255
100.00%
6
100.00%



static size_t ipip6_get_size(const struct net_device *dev)
{
	return
		/* IFLA_IPTUN_LINK */
		nla_total_size(4) +
		/* IFLA_IPTUN_LOCAL */
		nla_total_size(4) +
		/* IFLA_IPTUN_REMOTE */
		nla_total_size(4) +
		/* IFLA_IPTUN_TTL */
		nla_total_size(1) +
		/* IFLA_IPTUN_TOS */
		nla_total_size(1) +
		/* IFLA_IPTUN_PMTUDISC */
		nla_total_size(1) +
		/* IFLA_IPTUN_FLAGS */
		nla_total_size(2) +
		/* IFLA_IPTUN_PROTO */
		nla_total_size(1) +
#ifdef CONFIG_IPV6_SIT_6RD
		/* IFLA_IPTUN_6RD_PREFIX */
		nla_total_size(sizeof(struct in6_addr)) +
		/* IFLA_IPTUN_6RD_RELAY_PREFIX */
		nla_total_size(4) +
		/* IFLA_IPTUN_6RD_PREFIXLEN */
		nla_total_size(2) +
		/* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
		nla_total_size(2) +
#endif
		/* IFLA_IPTUN_ENCAP_TYPE */
		nla_total_size(2) +
		/* IFLA_IPTUN_ENCAP_FLAGS */
		nla_total_size(2) +
		/* IFLA_IPTUN_ENCAP_SPORT */
		nla_total_size(2) +
		/* IFLA_IPTUN_ENCAP_DPORT */
		nla_total_size(2) +
		/* IFLA_IPTUN_FWMARK */
		nla_total_size(4) +
		0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
96
76.19%
3
60.00%
Tom Herbert
24
19.05%
1
20.00%
Craig Gallek
6
4.76%
1
20.00%
Total
126
100.00%
5
100.00%



static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
	struct ip_tunnel *tunnel = netdev_priv(dev);
	struct ip_tunnel_parm *parm = &tunnel->parms;

	if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
	    nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
	    nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
	    nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
	    nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
	    nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
		       !!(parm->iph.frag_off & htons(IP_DF))) ||
	    nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
	    nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) ||
	    nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
		goto nla_put_failure;

#ifdef CONFIG_IPV6_SIT_6RD
	if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX,
			     &tunnel->ip6rd.prefix) ||
	    nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
			    tunnel->ip6rd.relay_prefix) ||
	    nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
			tunnel->ip6rd.prefixlen) ||
	    nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
			tunnel->ip6rd.relay_prefixlen))
		goto nla_put_failure;
#endif

	if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
			tunnel->encap.type) ||
	    nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
			tunnel->encap.sport) ||
	    nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
			tunnel->encap.dport) ||
	    nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
			tunnel->encap.flags))
		goto nla_put_failure;

	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
219
75.26%
6
54.55%
Tom Herbert
55
18.90%
2
18.18%
Craig Gallek
11
3.78%
1
9.09%
Jiri Benc
4
1.37%
1
9.09%
Eric Dumazet
2
0.69%
1
9.09%
Total
291
100.00%
11
100.00%


static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
	[IFLA_IPTUN_LINK]		= { .type = NLA_U32 },
	[IFLA_IPTUN_LOCAL]		= { .type = NLA_U32 },
	[IFLA_IPTUN_REMOTE]		= { .type = NLA_U32 },
	[IFLA_IPTUN_TTL]		= { .type = NLA_U8 },
	[IFLA_IPTUN_TOS]		= { .type = NLA_U8 },
	[IFLA_IPTUN_PMTUDISC]		= { .type = NLA_U8 },
	[IFLA_IPTUN_FLAGS]		= { .type = NLA_U16 },
	[IFLA_IPTUN_PROTO]		= { .type = NLA_U8 },
#ifdef CONFIG_IPV6_SIT_6RD
	[IFLA_IPTUN_6RD_PREFIX]		= { .len = sizeof(struct in6_addr) },
	[IFLA_IPTUN_6RD_RELAY_PREFIX]	= { .type = NLA_U32 },
	[IFLA_IPTUN_6RD_PREFIXLEN]	= { .type = NLA_U16 },
	[IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
#endif
	[IFLA_IPTUN_ENCAP_TYPE]		= { .type = NLA_U16 },
	[IFLA_IPTUN_ENCAP_FLAGS]	= { .type = NLA_U16 },
	[IFLA_IPTUN_ENCAP_SPORT]	= { .type = NLA_U16 },
	[IFLA_IPTUN_ENCAP_DPORT]	= { .type = NLA_U16 },
	[IFLA_IPTUN_FWMARK]		= { .type = NLA_U32 },
};



static void ipip6_dellink(struct net_device *dev, struct list_head *head)
{
	struct net *net = dev_net(dev);
	struct sit_net *sitn = net_generic(net, sit_net_id);

	if (dev != sitn->fb_tunnel_dev)
		unregister_netdevice_queue(dev, head);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Willem de Bruijn
53
100.00%
1
100.00%
Total
53
100.00%
1
100.00%


static struct rtnl_link_ops sit_link_ops __read_mostly = {
	.kind		= "sit",
	.maxtype	= IFLA_IPTUN_MAX,
	.policy		= ipip6_policy,
	.priv_size	= sizeof(struct ip_tunnel),
	.setup		= ipip6_tunnel_setup,
	.validate	= ipip6_validate,
	.newlink	= ipip6_newlink,
	.changelink	= ipip6_changelink,
	.get_size	= ipip6_get_size,
	.fill_info	= ipip6_fill_info,
	.dellink	= ipip6_dellink,
	.get_link_net	= ip_tunnel_get_link_net,
};


static struct xfrm_tunnel sit_handler __read_mostly = {
	.handler	=	ipip6_rcv,
	.err_handler	=	ipip6_err,
	.priority	=	1,
};


static struct xfrm_tunnel ipip_handler __read_mostly = {
	.handler	=	ipip_rcv,
	.err_handler	=	ipip6_err,
	.priority	=	2,
};

#if IS_ENABLED(CONFIG_MPLS)

static struct xfrm_tunnel mplsip_handler __read_mostly = {
	.handler	=	mplsip_rcv,
	.err_handler	=	ipip6_err,
	.priority	=	2,
};
#endif



static void __net_exit sit_destroy_tunnels(struct net *net,
					   struct list_head *head)
{
	struct sit_net *sitn = net_generic(net, sit_net_id);
	struct net_device *dev, *aux;
	int prio;

	for_each_netdev_safe(net, dev, aux)
		if (dev->rtnl_link_ops == &sit_link_ops)
			unregister_netdevice_queue(dev, head);

	for (prio = 1; prio < 4; prio++) {
		int h;
		for (h = 0; h < IP6_SIT_HASH_SIZE; h++) {
			struct ip_tunnel *t;

			t = rtnl_dereference(sitn->tunnels[prio][h]);
			while (t) {
				/* If dev is in the same netns, it has already
                                 * been added to the list by the previous loop.
                                 */
				if (!net_eq(dev_net(t->dev), net))
					unregister_netdevice_queue(t->dev,
								   head);
				t = rtnl_dereference(t->next);
			}
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexey Kuznetsov
60
38.22%
1
11.11%
Nicolas Dichtel
54
34.39%
2
22.22%
Eric Dumazet
29
18.47%
2
22.22%
Willem de Bruijn
8
5.10%
1
11.11%
Pavel Emelyanov
4
2.55%
1
11.11%
Alexey Dobriyan
1
0.64%
1
11.11%
Jiri Kosina
1
0.64%
1
11.11%
Total
157
100.00%
9
100.00%



static int __net_init sit_init_net(struct net *net)
{
	struct sit_net *sitn = net_generic(net, sit_net_id);
	struct ip_tunnel *t;
	int err;

	sitn->tunnels[0] = sitn->tunnels_wc;
	sitn->tunnels[1] = sitn->tunnels_l;
	sitn->tunnels[2] = sitn->tunnels_r;
	sitn->tunnels[3] = sitn->tunnels_r_l;

	sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
					   NET_NAME_UNKNOWN,
					   ipip6_tunnel_setup);
	if (!sitn->fb_tunnel_dev) {
		err = -ENOMEM;
		goto err_alloc_dev;
	}
	dev_net_set(sitn->fb_tunnel_dev, net);
	sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops;
	/* FB netdevice is special: we have one, and only one per netns.
         * Allowing to move it to another netns is clearly unsafe.
         */
	sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;

	err = register_netdev(sitn->fb_tunnel_dev);
	if (err)
		goto err_reg_dev;

	ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
	ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);

	t = netdev_priv(sitn->fb_tunnel_dev);

	strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
	return 0;

err_reg_dev:
	ipip6_dev_free(sitn->fb_tunnel_dev);
err_alloc_dev:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Pavel Emelyanov
130
61.32%
3
20.00%
Ted Feng
29
13.68%
1
6.67%
Nicolas Dichtel
18
8.49%
2
13.33%
Eric Dumazet
12
5.66%
2
13.33%
Hideaki Yoshifuji / 吉藤英明
9
4.25%
1
6.67%
Eric W. Biedermann
5
2.36%
1
6.67%
Alexey Dobriyan
4
1.89%
2
13.33%
Stephen Hemminger
2
0.94%
1
6.67%
Tom Gundersen
2
0.94%
1
6.67%
Ian Morris
1
0.47%
1
6.67%
Total
212
100.00%
15
100.00%



static void __net_exit sit_exit_batch_net(struct list_head *net_list)
{
	LIST_HEAD(list);
	struct net *net;

	rtnl_lock();
	list_for_each_entry(net, net_list, exit_list)
		sit_destroy_tunnels(net, &list);

	unregister_netdevice_many(&list);
	rtnl_unlock();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
23
46.00%
2
25.00%
Pavel Emelyanov
21
42.00%
3
37.50%
Eric W. Biedermann
4
8.00%
1
12.50%
Willem de Bruijn
1
2.00%
1
12.50%
Alexey Dobriyan
1
2.00%
1
12.50%
Total
50
100.00%
8
100.00%


static struct pernet_operations sit_net_ops = {
	.init = sit_init_net,
	.exit_batch = sit_exit_batch_net,
	.id   = &sit_net_id,
	.size = sizeof(struct sit_net),
};



static void __exit sit_cleanup(void)
{
	rtnl_link_unregister(&sit_link_ops);
	xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
	xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
#if IS_ENABLED(CONFIG_MPLS)
	xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
#endif

	unregister_pernet_device(&sit_net_ops);
	rcu_barrier(); /* Wait for completion of call_rcu()'s */
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Simon Horman
16
28.07%
1
8.33%
Nicolas Dichtel
14
24.56%
2
16.67%
Linus Torvalds (pre-git)
11
19.30%
2
16.67%
Pavel Emelyanov
5
8.77%
1
8.33%
Eric Dumazet
4
7.02%
1
8.33%
Kazunori Miyazawa
3
5.26%
1
8.33%
Al Viro
1
1.75%
1
8.33%
David S. Miller
1
1.75%
1
8.33%
Eric W. Biedermann
1
1.75%
1
8.33%
Adrian Bunk
1
1.75%
1
8.33%
Total
57
100.00%
12
100.00%



static int __init sit_init(void)
{
	int err;

	pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n");

	err = register_pernet_device(&sit_net_ops);
	if (err < 0)
		return err;
	err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
	if (err < 0) {
		pr_info("%s: can't register ip6ip4\n", __func__);
		goto xfrm_tunnel_failed;
	}
	err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
	if (err < 0) {
		pr_info("%s: can't register ip4ip4\n", __func__);
		goto xfrm_tunnel4_failed;
	}
#if IS_ENABLED(CONFIG_MPLS)
	err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
	if (err < 0) {
		pr_info("%s: can't register mplsip\n", __func__);
		goto xfrm_tunnel_mpls_failed;
	}
#endif
	err = rtnl_link_register(&sit_link_ops);
	if (err < 0)
		goto rtnl_link_failed;

out:
	return err;

rtnl_link_failed:
#if IS_ENABLED(CONFIG_MPLS)
	xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
xfrm_tunnel_mpls_failed:
#endif
	xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
xfrm_tunnel4_failed:
	xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
xfrm_tunnel_failed:
	unregister_pernet_device(&sit_net_ops);
	goto out;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
82
41.62%
2
15.38%
Simon Horman
55
27.92%
1
7.69%
Alexey Dobriyan
18
9.14%
1
7.69%
Pavel Emelyanov
15
7.61%
2
15.38%
Linus Torvalds (pre-git)
11
5.58%
3
23.08%
David S. Miller
8
4.06%
1
7.69%
Joe Perches
4
2.03%
1
7.69%
Stephen Hemminger
3
1.52%
1
7.69%
Adrian Bunk
1
0.51%
1
7.69%
Total
197
100.00%
13
100.00%


module_init(sit_init);

module_exit(sit_cleanup);
MODULE_LICENSE("GPL");
MODULE_ALIAS_RTNL_LINK("sit");
MODULE_ALIAS_NETDEV("sit0");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
2572
26.51%
21
9.77%
Linus Torvalds (pre-git)
1892
19.50%
19
8.84%
Hideaki Yoshifuji / 吉藤英明
947
9.76%
12
5.58%
Fred L. Templin
609
6.28%
2
0.93%
Eric Dumazet
543
5.60%
25
11.63%
Tom Herbert
442
4.56%
4
1.86%
Pavel Emelyanov
400
4.12%
8
3.72%
Simon Horman
291
3.00%
2
0.93%
Catalin(ux aka Dino) M. Boie
258
2.66%
1
0.47%
David S. Miller
232
2.39%
13
6.05%
Michal Schmidt
158
1.63%
1
0.47%
Hannes Frederic Sowa
133
1.37%
4
1.86%
Craig Gallek
124
1.28%
1
0.47%
Stephen Hemminger
115
1.19%
6
2.79%
David Ahern
107
1.10%
1
0.47%
Sascha Hlusiak
104
1.07%
6
2.79%
Alexey Kuznetsov
77
0.79%
4
1.86%
Willem de Bruijn
67
0.69%
1
0.47%
Patrick McHardy
52
0.54%
5
2.33%
Eric W. Biedermann
45
0.46%
2
0.93%
Steffen Klassert
38
0.39%
1
0.47%
Pravin B Shelar
38
0.39%
5
2.33%
Paolo Abeni
30
0.31%
1
0.47%
Ted Feng
29
0.30%
1
0.47%
Jesse Gross
27
0.28%
1
0.47%
Alexey Dobriyan
27
0.28%
5
2.33%
Herbert Xu
26
0.27%
4
1.86%
Li RongQing
25
0.26%
3
1.40%
Arnaldo Carvalho de Melo
23
0.24%
5
2.33%
Américo Wang
19
0.20%
5
2.33%
Kazunori Miyazawa
17
0.18%
1
0.47%
Li Hongjun
15
0.15%
1
0.47%
Matthias Schiffer
15
0.15%
3
1.40%
Jarod Wilson
14
0.14%
1
0.47%
Hangbin Liu
14
0.14%
1
0.47%
Linus Torvalds
13
0.13%
4
1.86%
Joe Perches
13
0.13%
2
0.93%
Alexander Duyck
12
0.12%
1
0.47%
Lionel Elie Mamane
11
0.11%
1
0.47%
Ian Morris
11
0.11%
2
0.93%
Wei Yongjun
11
0.11%
2
0.93%
Oussama Ghorbel
10
0.10%
1
0.47%
Joerg Roedel
10
0.10%
1
0.47%
Jiri Benc
9
0.09%
3
1.40%
Tom Gundersen
9
0.09%
2
0.93%
Al Viro
9
0.09%
2
0.93%
Thadeu Lima de Souza Cascardo
7
0.07%
1
0.47%
Dmitry Popov
6
0.06%
1
0.47%
Jiri Kosina
5
0.05%
1
0.47%
Jan Dittmer
5
0.05%
1
0.47%
Julian Anastasov
5
0.05%
2
0.93%
Kris Katterjohn
4
0.04%
1
0.47%
David McCullough
4
0.04%
1
0.47%
Changli Gao
3
0.03%
1
0.47%
Stephen Rothwell
3
0.03%
1
0.47%
Randy Dunlap
3
0.03%
1
0.47%
Gao Feng
3
0.03%
1
0.47%
Shmulik Ladkani
3
0.03%
1
0.47%
Tejun Heo
3
0.03%
1
0.47%
Adrian Bunk
2
0.02%
1
0.47%
Paul E. McKenney
2
0.02%
1
0.47%
Chuck Lever
1
0.01%
1
0.47%
Vasiliy Kulikov
1
0.01%
1
0.47%
Total
9703
100.00%
215
100.00%
Directory: net/ipv6

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