Release 4.8 net/ipv6/ip6_input.c

/*
 *      IPv6 input
 *      Linux INET6 implementation
 *
 *      Authors:
 *      Pedro Roque             <roque@di.fc.ul.pt>
 *      Ian P. Morris           <I.P.Morris@soton.ac.uk>
 *
 *      Based in linux/net/ipv4/ip_input.c
 *
 *      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
 *
 *      Mitsuru KANDA @USAGI and
 *      YOSHIFUJI Hideaki @USAGI: Remove ipv6_parse_exthdrs().
 */

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/in6.h>
#include <linux/icmpv6.h>
#include <linux/mroute6.h>
#include <linux/slab.h>

#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>

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

#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/transp_v6.h>
#include <net/rawv6.h>
#include <net/ndisc.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/xfrm.h>
#include <net/inet_ecn.h>
#include <net/dst_metadata.h>



int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	/* if ingress device is enslaved to an L3 master device pass the
         * skb to its handler for processing
         */
	skb = l3mdev_ip6_rcv(skb);
	if (!skb)
		return NET_RX_SUCCESS;

	if (net->ipv4.sysctl_ip_early_demux && !skb_dst(skb) && skb->sk == NULL) {
		const struct inet6_protocol *ipprot;

		ipprot = rcu_dereference(inet6_protos[ipv6_hdr(skb)->nexthdr]);
		if (ipprot && ipprot->early_demux)
			ipprot->early_demux(skb);
	}
	if (!skb_valid_dst(skb))
		ip6_route_input(skb);

	return dst_input(skb);
}

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eric dumazet
eric dumazet
51
45.13%
2
20.00%
pre-git
pre-git
24
21.24%
1
10.00%
david ahern
david ahern
16
14.16%
1
10.00%
holger eitzenberger
holger eitzenberger
6
5.31%
1
10.00%
eric w. biederman
eric w. biederman
5
4.42%
1
10.00%
david s. miller
david s. miller
5
4.42%
1
10.00%
nikolay borisov
nikolay borisov
4
3.54%
1
10.00%
wei-chun chao
wei-chun chao
1
0.88%
1
10.00%
hideaki yoshifuji
hideaki yoshifuji
1
0.88%
1
10.00%
Total
113
100.00%
10
100.00%



int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
{
	const struct ipv6hdr *hdr;
	u32 pkt_len;
	struct inet6_dev *idev;
	struct net *net = dev_net(skb->dev);

	if (skb->pkt_type == PACKET_OTHERHOST) {
		kfree_skb(skb);
		return NET_RX_DROP;
	}

	rcu_read_lock();

	idev = __in6_dev_get(skb->dev);

	__IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_IN, skb->len);

	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL ||
	    !idev || unlikely(idev->cnf.disable_ipv6)) {
		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS);
		goto drop;
	}

	memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));

	/*
         * Store incoming device index. When the packet will
         * be queued, we cannot refer to skb->dev anymore.
         *
         * BTW, when we send a packet for our own local address on a
         * non-loopback interface (e.g. ethX), it is being delivered
         * via the loopback interface (lo) here; skb->dev = loopback_dev.
         * It, however, should be considered as if it is being
         * arrived via the sending interface (ethX), because of the
         * nature of scoping architecture. --yoshfuji
         */
	IP6CB(skb)->iif = skb_valid_dst(skb) ? ip6_dst_idev(skb_dst(skb))->dev->ifindex : dev->ifindex;

	if (unlikely(!pskb_may_pull(skb, sizeof(*hdr))))
		goto err;

	hdr = ipv6_hdr(skb);

	if (hdr->version != 6)
		goto err;

	__IP6_ADD_STATS(net, idev,
			IPSTATS_MIB_NOECTPKTS +
				(ipv6_get_dsfield(hdr) & INET_ECN_MASK),
			max_t(unsigned short, 1, skb_shinfo(skb)->gso_segs));
	/*
         * RFC4291 2.5.3
         * A packet received on an interface with a destination address
         * of loopback must be dropped.
         */
	if (!(dev->flags & IFF_LOOPBACK) &&
	    ipv6_addr_loopback(&hdr->daddr))
		goto err;

	/* RFC4291 Errata ID: 3480
         * Interface-Local scope spans only a single interface on a
         * node and is useful only for loopback transmission of
         * multicast.  Packets with interface-local scope received
         * from another node must be discarded.
         */
	if (!(skb->pkt_type == PACKET_LOOPBACK ||
	      dev->flags & IFF_LOOPBACK) &&
	    ipv6_addr_is_multicast(&hdr->daddr) &&
	    IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 1)
		goto err;

	/* If enabled, drop unicast packets that were encapsulated in link-layer
         * multicast or broadcast to protected against the so-called "hole-196"
         * attack in 802.11 wireless.
         */
	if (!ipv6_addr_is_multicast(&hdr->daddr) &&
	    (skb->pkt_type == PACKET_BROADCAST ||
	     skb->pkt_type == PACKET_MULTICAST) &&
	    idev->cnf.drop_unicast_in_l2_multicast)
		goto err;

	/* RFC4291 2.7
         * Nodes must not originate a packet to a multicast address whose scope
         * field contains the reserved value 0; if such a packet is received, it
         * must be silently dropped.
         */
	if (ipv6_addr_is_multicast(&hdr->daddr) &&
	    IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 0)
		goto err;

	/*
         * RFC4291 2.7
         * Multicast addresses must not be used as source addresses in IPv6
         * packets or appear in any Routing header.
         */
	if (ipv6_addr_is_multicast(&hdr->saddr))
		goto err;

	skb->transport_header = skb->network_header + sizeof(*hdr);
	IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);

	pkt_len = ntohs(hdr->payload_len);

	/* pkt_len may be zero if Jumbo payload option is present */
	if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) {
		if (pkt_len + sizeof(struct ipv6hdr) > skb->len) {
			__IP6_INC_STATS(net,
					idev, IPSTATS_MIB_INTRUNCATEDPKTS);
			goto drop;
		}
		if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) {
			__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
			goto drop;
		}
		hdr = ipv6_hdr(skb);
	}

	if (hdr->nexthdr == NEXTHDR_HOP) {
		if (ipv6_parse_hopopts(skb) < 0) {
			__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
			rcu_read_unlock();
			return NET_RX_DROP;
		}
	}

	rcu_read_unlock();

	/* Must drop socket now because of tproxy. */
	skb_orphan(skb);

	return NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING,
		       net, NULL, skb, dev, NULL,
		       ip6_rcv_finish);
err:
	__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
drop:
	rcu_read_unlock();
	kfree_skb(skb);
	return NET_RX_DROP;
}

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pre-git
pre-git
177
30.31%
7
14.89%
hideaki yoshifuji
hideaki yoshifuji
98
16.78%
7
14.89%
hannes frederic sowa
hannes frederic sowa
63
10.79%
2
4.26%
eric dumazet
eric dumazet
38
6.51%
5
10.64%
johannes berg
johannes berg
35
5.99%
1
2.13%
linus torvalds
linus torvalds
29
4.97%
1
2.13%
denis v. lunev
denis v. lunev
24
4.11%
1
2.13%
patrick mchardy
patrick mchardy
22
3.77%
2
4.26%
guillaume chazarain
guillaume chazarain
16
2.74%
1
2.13%
brian haley
brian haley
14
2.40%
1
2.13%
arnaldo carvalho de melo
arnaldo carvalho de melo
14
2.40%
3
6.38%
herbert xu
herbert xu
12
2.05%
3
6.38%
mitsuru chinen
mitsuru chinen
9
1.54%
1
2.13%
david s. miller
david s. miller
7
1.20%
2
4.26%
shirley ma
shirley ma
6
1.03%
1
2.13%
neil horman
neil horman
5
0.86%
1
2.13%
nivedita singhvi
nivedita singhvi
5
0.86%
1
2.13%
mark smith
mark smith
3
0.51%
1
2.13%
eric w. biederman
eric w. biederman
3
0.51%
2
4.26%
jesper nilsson
jesper nilsson
1
0.17%
1
2.13%
jan engelhardt
jan engelhardt
1
0.17%
1
2.13%
wei-chun chao
wei-chun chao
1
0.17%
1
2.13%
daniel lezcano
daniel lezcano
1
0.17%
1
2.13%
Total
584
100.00%
47
100.00%

/*
 *      Deliver the packet to the host
 */




static int ip6_input_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	const struct inet6_protocol *ipprot;
	struct inet6_dev *idev;
	unsigned int nhoff;
	int nexthdr;
	bool raw;
	bool have_final = false;

	/*
         *      Parse extension headers
         */

	rcu_read_lock();
resubmit:
	idev = ip6_dst_idev(skb_dst(skb));
	if (!pskb_pull(skb, skb_transport_offset(skb)))
		goto discard;
	nhoff = IP6CB(skb)->nhoff;
	nexthdr = skb_network_header(skb)[nhoff];

resubmit_final:
	raw = raw6_local_deliver(skb, nexthdr);
	ipprot = rcu_dereference(inet6_protos[nexthdr]);
	if (ipprot) {
		int ret;

		if (have_final) {
			if (!(ipprot->flags & INET6_PROTO_FINAL)) {
				/* Once we've seen a final protocol don't
                                 * allow encapsulation on any non-final
                                 * ones. This allows foo in UDP encapsulation
                                 * to work.
                                 */
				goto discard;
			}
		} else if (ipprot->flags & INET6_PROTO_FINAL) {
			const struct ipv6hdr *hdr;

			/* Only do this once for first final protocol */
			have_final = true;

			/* Free reference early: we don't need it any more,
                           and it may hold ip_conntrack module loaded
                           indefinitely. */
			nf_reset(skb);

			skb_postpull_rcsum(skb, skb_network_header(skb),
					   skb_network_header_len(skb));
			hdr = ipv6_hdr(skb);
			if (ipv6_addr_is_multicast(&hdr->daddr) &&
			    !ipv6_chk_mcast_addr(skb->dev, &hdr->daddr,
			    &hdr->saddr) &&
			    !ipv6_is_mld(skb, nexthdr, skb_network_header_len(skb)))
				goto discard;
		}
		if (!(ipprot->flags & INET6_PROTO_NOPOLICY) &&
		    !xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
			goto discard;

		ret = ipprot->handler(skb);
		if (ret > 0) {
			if (ipprot->flags & INET6_PROTO_FINAL) {
				/* Not an extension header, most likely UDP
                                 * encapsulation. Use return value as nexthdr
                                 * protocol not nhoff (which presumably is
                                 * not set by handler).
                                 */
				nexthdr = ret;
				goto resubmit_final;
			} else {
				goto resubmit;
			}
		} else if (ret == 0) {
			__IP6_INC_STATS(net, idev, IPSTATS_MIB_INDELIVERS);
		}
	} else {
		if (!raw) {
			if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
				__IP6_INC_STATS(net, idev,
						IPSTATS_MIB_INUNKNOWNPROTOS);
				icmpv6_send(skb, ICMPV6_PARAMPROB,
					    ICMPV6_UNK_NEXTHDR, nhoff);
			}
			kfree_skb(skb);
		} else {
			__IP6_INC_STATS(net, idev, IPSTATS_MIB_INDELIVERS);
			consume_skb(skb);
		}
	}
	rcu_read_unlock();
	return 0;

discard:
	__IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS);
	rcu_read_unlock();
	kfree_skb(skb);
	return 0;
}


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hideaki yoshifuji
hideaki yoshifuji
77
18.29%
4
9.76%
tom herbert
tom herbert
61
14.49%
2
4.88%
pre-git
pre-git
60
14.25%
6
14.63%
david l stevens
david l stevens
48
11.40%
1
2.44%
tom lendacky
tom lendacky
33
7.84%
1
2.44%
david s. miller
david s. miller
30
7.13%
4
9.76%
arnaldo carvalho de melo
arnaldo carvalho de melo
15
3.56%
4
9.76%
linus torvalds
linus torvalds
13
3.09%
1
2.44%
patrick mchardy
patrick mchardy
12
2.85%
2
4.88%
stephen hemminger
stephen hemminger
12
2.85%
1
2.44%
eric dumazet
eric dumazet
10
2.38%
4
9.76%
neil horman
neil horman
8
1.90%
1
2.44%
denis v. lunev
denis v. lunev
8
1.90%
1
2.44%
nivedita singhvi
nivedita singhvi
7
1.66%
1
2.44%
yasuyuki kozakai
yasuyuki kozakai
6
1.43%
1
2.44%
eric w. biederman
eric w. biederman
5
1.19%
1
2.44%
pavel emelianov
pavel emelianov
4
0.95%
1
2.44%
ian morris
ian morris
4
0.95%
1
2.44%
shirley ma
shirley ma
3
0.71%
1
2.44%
dipankar sarma
dipankar sarma
3
0.71%
1
2.44%
herbert xu
herbert xu
1
0.24%
1
2.44%
alexey dobriyan
alexey dobriyan
1
0.24%
1
2.44%
Total
421
100.00%
41
100.00%



int ip6_input(struct sk_buff *skb)
{
	return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_IN,
		       dev_net(skb->dev), NULL, skb, skb->dev, NULL,
		       ip6_input_finish);
}
Contributors
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pre-git
pre-git
26
70.27%
1
20.00%
eric w. biederman
eric w. biederman
7
18.92%
1
20.00%
david s. miller
david s. miller
2
5.41%
1
20.00%
patrick mchardy
patrick mchardy
1
2.70%
1
20.00%
jan engelhardt
jan engelhardt
1
2.70%
1
20.00%
Total
37
100.00%
5
100.00%


EXPORT_SYMBOL_GPL(ip6_input);



int ip6_mc_input(struct sk_buff *skb)
{
	const struct ipv6hdr *hdr;
	bool deliver;

	__IP6_UPD_PO_STATS(dev_net(skb_dst(skb)->dev),
			 ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INMCAST,
			 skb->len);

	hdr = ipv6_hdr(skb);
	deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);

#ifdef CONFIG_IPV6_MROUTE
	/*
         *      IPv6 multicast router mode is now supported ;)
         */
	if (dev_net(skb->dev)->ipv6.devconf_all->mc_forwarding &&
	    !(ipv6_addr_type(&hdr->daddr) &
	      (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)) &&
	    likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) {
		/*
                 * Okay, we try to forward - split and duplicate
                 * packets.
                 */
		struct sk_buff *skb2;
		struct inet6_skb_parm *opt = IP6CB(skb);

		/* Check for MLD */
		if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) {
			/* Check if this is a mld message */
			u8 nexthdr = hdr->nexthdr;
			__be16 frag_off;
			int offset;

			/* Check if the value of Router Alert
                         * is for MLD (0x0000).
                         */
			if (opt->ra == htons(IPV6_OPT_ROUTERALERT_MLD)) {
				deliver = false;

				if (!ipv6_ext_hdr(nexthdr)) {
					/* BUG */
					goto out;
				}
				offset = ipv6_skip_exthdr(skb, sizeof(*hdr),
							  &nexthdr, &frag_off);
				if (offset < 0)
					goto out;

				if (ipv6_is_mld(skb, nexthdr, offset))
					deliver = true;

				goto out;
			}
			/* unknown RA - process it normally */
		}

		if (deliver)
			skb2 = skb_clone(skb, GFP_ATOMIC);
		else {
			skb2 = skb;
			skb = NULL;
		}

		if (skb2) {
			ip6_mr_input(skb2);
		}
	}
out:
#endif
	if (likely(deliver))
		ip6_input(skb);
	else {
		/* discard */
		kfree_skb(skb);
	}

	return 0;
}
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hideaki yoshifuji
hideaki yoshifuji
194
62.99%
6
26.09%
pre-git
pre-git
54
17.53%
4
17.39%
thomas goff
thomas goff
13
4.22%
1
4.35%
eric dumazet
eric dumazet
11
3.57%
4
17.39%
david l stevens
david l stevens
8
2.60%
2
8.70%
denis v. lunev
denis v. lunev
7
2.27%
1
4.35%
jesse gross
jesse gross
6
1.95%
1
4.35%
neil horman
neil horman
5
1.62%
1
4.35%
hannes frederic sowa
hannes frederic sowa
4
1.30%
1
4.35%
angga
angga
3
0.97%
1
4.35%
arnaldo carvalho de melo
arnaldo carvalho de melo
3
0.97%
1
4.35%
Total
308
100.00%
23
100.00%

Overall Contributors
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Tokens
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CommitProp
pre-git
pre-git
399
25.86%
8
9.09%
hideaki yoshifuji
hideaki yoshifuji
373
24.17%
14
15.91%
eric dumazet
eric dumazet
113
7.32%
7
7.95%
hannes frederic sowa
hannes frederic sowa
67
4.34%
3
3.41%
tom herbert
tom herbert
61
3.95%
2
2.27%
david l stevens
david l stevens
56
3.63%
2
2.27%
david s. miller
david s. miller
44
2.85%
5
5.68%
linus torvalds
linus torvalds
42
2.72%
1
1.14%
denis v. lunev
denis v. lunev
39
2.53%
1
1.14%
tom lendacky
tom lendacky
36
2.33%
1
1.14%
johannes berg
johannes berg
35
2.27%
1
1.14%
patrick mchardy
patrick mchardy
35
2.27%
3
3.41%
arnaldo carvalho de melo
arnaldo carvalho de melo
32
2.07%
6
6.82%
david ahern
david ahern
21
1.36%
2
2.27%
eric w. biederman
eric w. biederman
20
1.30%
3
3.41%
neil horman
neil horman
18
1.17%
2
2.27%
guillaume chazarain
guillaume chazarain
16
1.04%
1
1.14%
brian haley
brian haley
14
0.91%
1
1.14%
herbert xu
herbert xu
13
0.84%
3
3.41%
thomas goff
thomas goff
13
0.84%
1
1.14%
stephen hemminger
stephen hemminger
12
0.78%
1
1.14%
nivedita singhvi
nivedita singhvi
12
0.78%
1
1.14%
shirley ma
shirley ma
9
0.58%
1
1.14%
mitsuru chinen
mitsuru chinen
9
0.58%
1
1.14%
yasuyuki kozakai
yasuyuki kozakai
6
0.39%
1
1.14%
jesse gross
jesse gross
6
0.39%
1
1.14%
holger eitzenberger
holger eitzenberger
6
0.39%
1
1.14%
wei-chun chao
wei-chun chao
5
0.32%
1
1.14%
ian morris
ian morris
5
0.32%
2
2.27%
nikolay borisov
nikolay borisov
4
0.26%
1
1.14%
pavel emelianov
pavel emelianov
4
0.26%
1
1.14%
angga
angga
3
0.19%
1
1.14%
dipankar sarma
dipankar sarma
3
0.19%
1
1.14%
mark smith
mark smith
3
0.19%
1
1.14%
tejun heo
tejun heo
3
0.19%
1
1.14%
jan engelhardt
jan engelhardt
2
0.13%
1
1.14%
daniel lezcano
daniel lezcano
1
0.06%
1
1.14%
alexey dobriyan
alexey dobriyan
1
0.06%
1
1.14%
jesper nilsson
jesper nilsson
1
0.06%
1
1.14%
adrian bunk
adrian bunk
1
0.06%
1
1.14%
Total
1543
100.00%
88
100.00%
  
Directory: net/ipv6

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