Release 4.11 net/sctp/ipv6.c

/* SCTP kernel implementation
 * (C) Copyright IBM Corp. 2002, 2004
 * Copyright (c) 2001 Nokia, Inc.
 * Copyright (c) 2001 La Monte H.P. Yarroll
 * Copyright (c) 2002-2003 Intel Corp.
 *
 * This file is part of the SCTP kernel implementation
 *
 * SCTP over IPv6.
 *
 * This SCTP implementation 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, or (at your option)
 * any later version.
 *
 * This SCTP implementation is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 *                 ************************
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU CC; see the file COPYING.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * Please send any bug reports or fixes you make to the
 * email address(es):
 *    lksctp developers <linux-sctp@vger.kernel.org>
 *
 * Written or modified by:
 *    Le Yanqun             <yanqun.le@nokia.com>
 *    Hui Huang             <hui.huang@nokia.com>
 *    La Monte H.P. Yarroll <piggy@acm.org>
 *    Sridhar Samudrala     <sri@us.ibm.com>
 *    Jon Grimm             <jgrimm@us.ibm.com>
 *    Ardelle Fan           <ardelle.fan@intel.com>
 *
 * Based on:
 *      linux/net/ipv6/tcp_ipv6.c
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/ipsec.h>
#include <linux/slab.h>

#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/random.h>
#include <linux/seq_file.h>

#include <net/protocol.h>
#include <net/ndisc.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/transp_v6.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <net/inet_common.h>
#include <net/inet_ecn.h>
#include <net/sctp/sctp.h>

#include <linux/uaccess.h>

static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
					 union sctp_addr *s2);
static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
			      __be16 port);
static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
			    const union sctp_addr *addr2);

/* Event handler for inet6 address addition/deletion events.
 * The sctp_local_addr_list needs to be protocted by a spin lock since
 * multiple notifiers (say IPv4 and IPv6) may be running at the same
 * time and thus corrupt the list.
 * The reader side is protected with RCU.
 */


static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
				void *ptr)
{
	struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
	struct sctp_sockaddr_entry *addr = NULL;
	struct sctp_sockaddr_entry *temp;
	struct net *net = dev_net(ifa->idev->dev);
	int found = 0;

	switch (ev) {
	case NETDEV_UP:
		addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
		if (addr) {
			addr->a.v6.sin6_family = AF_INET6;
			addr->a.v6.sin6_port = 0;
			addr->a.v6.sin6_addr = ifa->addr;
			addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
			addr->valid = 1;
			spin_lock_bh(&net->sctp.local_addr_lock);
			list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
			sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
			spin_unlock_bh(&net->sctp.local_addr_lock);
		}
		break;
	case NETDEV_DOWN:
		spin_lock_bh(&net->sctp.local_addr_lock);
		list_for_each_entry_safe(addr, temp,
					&net->sctp.local_addr_list, list) {
			if (addr->a.sa.sa_family == AF_INET6 &&
					ipv6_addr_equal(&addr->a.v6.sin6_addr,
						&ifa->addr)) {
				sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
				found = 1;
				addr->valid = 0;
				list_del_rcu(&addr->list);
				break;
			}
		}
		spin_unlock_bh(&net->sctp.local_addr_lock);
		if (found)
			kfree_rcu(addr, rcu);
		break;
	}

	return NOTIFY_DONE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sridhar Samudrala
165
55.37%
1
11.11%
Vladislav Yasevich
51
17.11%
1
11.11%
Eric W. Biedermann
44
14.77%
1
11.11%
Michio Honda
14
4.70%
1
11.11%
Pavel Emelyanov
10
3.36%
1
11.11%
Chidambar 'ilLogict' Zinnoury
10
3.36%
1
11.11%
Lai Jiangshan
2
0.67%
1
11.11%
Alexey Dobriyan
1
0.34%
1
11.11%
Adrian Bunk
1
0.34%
1
11.11%
Total
298
100.00%
9
100.00%


static struct notifier_block sctp_inet6addr_notifier = {
	.notifier_call = sctp_inet6addr_event,
};

/* ICMP error handler. */


static void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
			u8 type, u8 code, int offset, __be32 info)
{
	struct inet6_dev *idev;
	struct sock *sk;
	struct sctp_association *asoc;
	struct sctp_transport *transport;
	struct ipv6_pinfo *np;
	__u16 saveip, savesctp;
	int err;
	struct net *net = dev_net(skb->dev);

	idev = in6_dev_get(skb->dev);

	/* Fix up skb to look at the embedded net header. */
	saveip	 = skb->network_header;
	savesctp = skb->transport_header;
	skb_reset_network_header(skb);
	skb_set_transport_header(skb, offset);
	sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
	/* Put back, the original pointers. */
	skb->network_header   = saveip;
	skb->transport_header = savesctp;
	if (!sk) {
		__ICMP6_INC_STATS(net, idev, ICMP6_MIB_INERRORS);
		goto out;
	}

	/* Warning:  The sock lock is held.  Remember to call
         * sctp_err_finish!
         */

	switch (type) {
	case ICMPV6_PKT_TOOBIG:
		if (ip6_sk_accept_pmtu(sk))
			sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
		goto out_unlock;
	case ICMPV6_PARAMPROB:
		if (ICMPV6_UNK_NEXTHDR == code) {
			sctp_icmp_proto_unreachable(sk, asoc, transport);
			goto out_unlock;
		}
		break;
	case NDISC_REDIRECT:
		sctp_icmp_redirect(sk, transport, skb);
		goto out_unlock;
	default:
		break;
	}

	np = inet6_sk(sk);
	icmpv6_err_convert(type, code, &err);
	if (!sock_owned_by_user(sk) && np->recverr) {
		sk->sk_err = err;
		sk->sk_error_report(sk);
	} else {  /* Only an error on timeout */
		sk->sk_err_soft = err;
	}

out_unlock:
	sctp_err_finish(sk, transport);
out:
	if (likely(idev != NULL))
		in6_dev_put(idev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jon Grimm
191
60.63%
3
13.64%
David S. Miller
47
14.92%
2
9.09%
Sridhar Samudrala
24
7.62%
1
4.55%
Arnaldo Carvalho de Melo
19
6.03%
4
18.18%
Eric W. Biedermann
15
4.76%
2
9.09%
Hannes Frederic Sowa
7
2.22%
1
4.55%
Daniel Borkmann
4
1.27%
2
9.09%
Brian Haley
2
0.63%
1
4.55%
Hideaki Yoshifuji / 吉藤英明
1
0.32%
1
4.55%
Xin Long
1
0.32%
1
4.55%
Eric Dumazet
1
0.32%
1
4.55%
Al Viro
1
0.32%
1
4.55%
Denis V. Lunev
1
0.32%
1
4.55%
Simon Horman
1
0.32%
1
4.55%
Total
315
100.00%
22
100.00%



static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
{
	struct sock *sk = skb->sk;
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct flowi6 *fl6 = &transport->fl.u.ip6;
	int res;

	pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
		 skb->len, &fl6->saddr, &fl6->daddr);

	IP6_ECN_flow_xmit(sk, fl6->flowlabel);

	if (!(transport->param_flags & SPP_PMTUD_ENABLE))
		skb->ignore_df = 1;

	SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);

	rcu_read_lock();
	res = ip6_xmit(sk, skb, fl6, sk->sk_mark, rcu_dereference(np->opt),
		       np->tclass);
	rcu_read_unlock();
	return res;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jon Grimm
49
33.56%
2
11.76%
Daniel Borkmann
22
15.07%
2
11.76%
Eric Dumazet
21
14.38%
2
11.76%
Sridhar Samudrala
19
13.01%
3
17.65%
Herbert Xu
16
10.96%
1
5.88%
David S. Miller
7
4.79%
1
5.88%
Pablo Neira Ayuso
4
2.74%
1
5.88%
Harvey Harrison
4
2.74%
3
17.65%
Eric W. Biedermann
3
2.05%
1
5.88%
Américo Wang
1
0.68%
1
5.88%
Total
146
100.00%
17
100.00%

/* Returns the dst cache entry for the given source and destination ip
 * addresses.
 */


static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
			    struct flowi *fl, struct sock *sk)
{
	struct sctp_association *asoc = t->asoc;
	struct dst_entry *dst = NULL;
	struct flowi6 *fl6 = &fl->u.ip6;
	struct sctp_bind_addr *bp;
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct sctp_sockaddr_entry *laddr;
	union sctp_addr *baddr = NULL;
	union sctp_addr *daddr = &t->ipaddr;
	union sctp_addr dst_saddr;
	struct in6_addr *final_p, final;
	__u8 matchlen = 0;
	__u8 bmatchlen;
	sctp_scope_t scope;

	memset(fl6, 0, sizeof(struct flowi6));
	fl6->daddr = daddr->v6.sin6_addr;
	fl6->fl6_dport = daddr->v6.sin6_port;
	fl6->flowi6_proto = IPPROTO_SCTP;
	if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
		fl6->flowi6_oif = daddr->v6.sin6_scope_id;

	pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);

	if (asoc)
		fl6->fl6_sport = htons(asoc->base.bind_addr.port);

	if (saddr) {
		fl6->saddr = saddr->v6.sin6_addr;
		fl6->fl6_sport = saddr->v6.sin6_port;

		pr_debug("src=%pI6 - ", &fl6->saddr);
	}

	rcu_read_lock();
	final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
	rcu_read_unlock();

	dst = ip6_dst_lookup_flow(sk, fl6, final_p);
	if (!asoc || saddr)
		goto out;

	bp = &asoc->base.bind_addr;
	scope = sctp_scope(daddr);
	/* ip6_dst_lookup has filled in the fl6->saddr for us.  Check
         * to see if we can use it.
         */
	if (!IS_ERR(dst)) {
		/* Walk through the bind address list and look for a bind
                 * address that matches the source address of the returned dst.
                 */
		sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
		rcu_read_lock();
		list_for_each_entry_rcu(laddr, &bp->address_list, list) {
			if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
			    (laddr->state != SCTP_ADDR_SRC &&
			     !asoc->src_out_of_asoc_ok))
				continue;

			/* Do not compare against v4 addrs */
			if ((laddr->a.sa.sa_family == AF_INET6) &&
			    (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
				rcu_read_unlock();
				goto out;
			}
		}
		rcu_read_unlock();
		/* None of the bound addresses match the source address of the
                 * dst. So release it.
                 */
		dst_release(dst);
		dst = NULL;
	}

	/* Walk through the bind address list and try to get the
         * best source address for a given destination.
         */
	rcu_read_lock();
	list_for_each_entry_rcu(laddr, &bp->address_list, list) {
		if (!laddr->valid)
			continue;
		if ((laddr->state == SCTP_ADDR_SRC) &&
		    (laddr->a.sa.sa_family == AF_INET6) &&
		    (scope <= sctp_scope(&laddr->a))) {
			bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
			if (!baddr || (matchlen < bmatchlen)) {
				baddr = &laddr->a;
				matchlen = bmatchlen;
			}
		}
	}
	if (baddr) {
		fl6->saddr = baddr->v6.sin6_addr;
		fl6->fl6_sport = baddr->v6.sin6_port;
		final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
		dst = ip6_dst_lookup_flow(sk, fl6, final_p);
	}
	rcu_read_unlock();

out:
	if (!IS_ERR_OR_NULL(dst)) {
		struct rt6_info *rt;

		rt = (struct rt6_info *)dst;
		t->dst = dst;
		t->dst_cookie = rt6_get_cookie(rt);
		pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
			 &rt->rt6i_dst.addr, rt->rt6i_dst.plen,
			 &fl6->saddr);
	} else {
		t->dst = NULL;

		pr_debug("no route\n");
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vladislav Yasevich
197
30.26%
4
11.11%
Sridhar Samudrala
152
23.35%
4
11.11%
Weixing Shi
79
12.14%
1
2.78%
Daniel Borkmann
73
11.21%
4
11.11%
Jon Grimm
64
9.83%
4
11.11%
David S. Miller
31
4.76%
3
8.33%
Eric Dumazet
15
2.30%
2
5.56%
Martin KaFai Lau
10
1.54%
2
5.56%
Harvey Harrison
7
1.08%
2
5.56%
Fan Du
6
0.92%
1
2.78%
Hideaki Yoshifuji / 吉藤英明
5
0.77%
3
8.33%
Al Viro
4
0.61%
2
5.56%
Alexey Dobriyan
3
0.46%
1
2.78%
Ville Nuorvala
3
0.46%
1
2.78%
Tommi Rantala
1
0.15%
1
2.78%
Daniel Lezcano
1
0.15%
1
2.78%
Total
651
100.00%
36
100.00%

/* Returns the number of consecutive initial bits that match in the 2 ipv6
 * addresses.
 */


static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
					 union sctp_addr *s2)
{
	return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sridhar Samudrala
31
88.57%
2
66.67%
Hideaki Yoshifuji / 吉藤英明
4
11.43%
1
33.33%
Total
35
100.00%
3
100.00%

/* Fills in the source address(saddr) based on the destination address(daddr)
 * and asoc's bind address list.
 */


static void sctp_v6_get_saddr(struct sctp_sock *sk,
			      struct sctp_transport *t,
			      struct flowi *fl)
{
	struct flowi6 *fl6 = &fl->u.ip6;
	union sctp_addr *saddr = &t->saddr;

	pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);

	if (t->dst) {
		saddr->v6.sin6_family = AF_INET6;
		saddr->v6.sin6_addr = fl6->saddr;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sridhar Samudrala
44
52.38%
2
20.00%
Vladislav Yasevich
30
35.71%
2
20.00%
Hideaki Yoshifuji / 吉藤英明
5
5.95%
1
10.00%
Jon Grimm
2
2.38%
2
20.00%
Daniel Borkmann
1
1.19%
1
10.00%
Harvey Harrison
1
1.19%
1
10.00%
Alexey Dobriyan
1
1.19%
1
10.00%
Total
84
100.00%
10
100.00%

/* Make a copy of all potential local addresses. */


static void sctp_v6_copy_addrlist(struct list_head *addrlist,
				  struct net_device *dev)
{
	struct inet6_dev *in6_dev;
	struct inet6_ifaddr *ifp;
	struct sctp_sockaddr_entry *addr;

	rcu_read_lock();
	if ((in6_dev = __in6_dev_get(dev)) == NULL) {
		rcu_read_unlock();
		return;
	}

	read_lock_bh(&in6_dev->lock);
	list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
		/* Add the address to the local list.  */
		addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
		if (addr) {
			addr->a.v6.sin6_family = AF_INET6;
			addr->a.v6.sin6_port = 0;
			addr->a.v6.sin6_addr = ifp->addr;
			addr->a.v6.sin6_scope_id = dev->ifindex;
			addr->valid = 1;
			INIT_LIST_HEAD(&addr->list);
			list_add_tail(&addr->list, addrlist);
		}
	}

	read_unlock_bh(&in6_dev->lock);
	rcu_read_unlock();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jon Grimm
137
80.59%
3
30.00%
Stephen Hemminger
8
4.71%
1
10.00%
Hideaki Yoshifuji / 吉藤英明
6
3.53%
1
10.00%
Daniel Borkmann
6
3.53%
1
10.00%
Vladislav Yasevich
6
3.53%
1
10.00%
Al Viro
4
2.35%
1
10.00%
Jarek Poplawski
2
1.18%
1
10.00%
Alexey Dobriyan
1
0.59%
1
10.00%
Total
170
100.00%
10
100.00%

/* Initialize a sockaddr_storage from in incoming skb. */


static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
			     int is_saddr)
{
	/* Always called on head skb, so this is safe */
	struct sctphdr *sh = sctp_hdr(skb);
	struct sockaddr_in6 *sa = &addr->v6;

	addr->v6.sin6_family = AF_INET6;
	addr->v6.sin6_flowinfo = 0; /* FIXME */
	addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;

	if (is_saddr) {
		sa->sin6_port = sh->source;
		sa->sin6_addr = ipv6_hdr(skb)->saddr;
	} else {
		sa->sin6_port = sh->dest;
		sa->sin6_addr = ipv6_hdr(skb)->daddr;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jon Grimm
93
75.61%
2
40.00%
Marcelo Ricardo Leitner
20
16.26%
1
20.00%
Arnaldo Carvalho de Melo
6
4.88%
1
20.00%
Alexey Dobriyan
4
3.25%
1
20.00%
Total
123
100.00%
5
100.00%

/* Initialize an sctp_addr from a socket. */


static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
{
	addr->v6.sin6_family = AF_INET6;
	addr->v6.sin6_port = 0;
	addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jon Grimm
39
92.86%
1
25.00%
Al Viro
1
2.38%
1
25.00%
Alexey Dobriyan
1
2.38%
1
25.00%
Eric Dumazet
1
2.38%
1
25.00%
Total
42
100.00%
4
100.00%

/* Initialize sk->sk_rcv_saddr from sctp_addr. */


static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
{
	if (addr->sa.sa_family == AF_INET) {
		sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
		sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
		sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
		sk->sk_v6_rcv_saddr.s6_addr32[3] =
			addr->v4.sin_addr.s_addr;
	} else {
		sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jon Grimm
87
92.55%
2
40.00%
Eric Dumazet
5
5.32%
1
20.00%
Sridhar Samudrala
1
1.06%
1
20.00%
Alexey Dobriyan
1
1.06%
1
20.00%
Total
94
100.00%
5
100.00%

/* Initialize sk->sk_daddr from sctp_addr. */


static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
{
	if (addr->sa.sa_family == AF_INET) {
		sk->sk_v6_daddr.s6_addr32[0] = 0;
		sk->sk_v6_daddr.s6_addr32[1] = 0;
		sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
		sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
	} else {
		sk->sk_v6_daddr = addr->v6.sin6_addr;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jon Grimm
64
68.09%
1
25.00%
Sridhar Samudrala
24
25.53%
1
25.00%
Eric Dumazet
5
5.32%
1
25.00%
Alexey Dobriyan
1
1.06%
1
25.00%
Total
94
100.00%
4
100.00%

/* Initialize a sctp_addr from an address parameter. */


static void sctp_v6_from_addr_param(union sctp_addr *addr,
				    union sctp_addr_param *param,
				    __be16 port, int iif)
{
	addr->v6.sin6_family = AF_INET6;
	addr->v6.sin6_port = port;
	addr->v6.sin6_flowinfo = 0; /* BUG */
	addr->v6.sin6_addr = param->v6.addr;
	addr->v6.sin6_scope_id = iif;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sridhar Samudrala
65
97.01%
1
33.33%
Al Viro
1
1.49%
1
33.33%
Alexey Dobriyan
1
1.49%
1
33.33%
Total
67
100.00%
3
100.00%

/* Initialize an address parameter from a sctp_addr and return the length
 * of the address parameter.
 */


static int sctp_v6_to_addr_param(const union sctp_addr *addr,
				 union sctp_addr_param *param)
{
	int length = sizeof(sctp_ipv6addr_param_t);

	param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
	param->v6.param_hdr.length = htons(length);
	param->v6.addr = addr->v6.sin6_addr;

	return length;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sridhar Samudrala
61
96.83%
1
33.33%
Al Viro
1
1.59%
1
33.33%
Alexey Dobriyan
1
1.59%
1
33.33%
Total
63
100.00%
3
100.00%

/* Initialize a sctp_addr from struct in6_addr. */


static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
			      __be16 port)
{
	addr->sa.sa_family = AF_INET6;
	addr->v6.sin6_port = port;
	addr->v6.sin6_addr = *saddr;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jon Grimm
22
50.00%
2
28.57%
Sridhar Samudrala
15
34.09%
2
28.57%
Vladislav Yasevich
4
9.09%
1
14.29%
Alexey Dobriyan
2
4.55%
1
14.29%
Al Viro
1
2.27%
1
14.29%
Total
44
100.00%
7
100.00%

/* Compare addresses exactly.
 * v4-mapped-v6 is also in consideration.
 */


static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
			    const union sctp_addr *addr2)
{
	if (addr1->sa.sa_family != addr2->sa.sa_family) {
		if (addr1->sa.sa_family == AF_INET &&
		    addr2->sa.sa_family == AF_INET6 &&
		    ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
			if (addr2->v6.sin6_port == addr1->v4.sin_port &&
			    addr2->v6.sin6_addr.s6_addr32[3] ==
			    addr1->v4.sin_addr.s_addr)
				return 1;
		}
		if (addr2->sa.sa_family == AF_INET &&
		    addr1->sa.sa_family == AF_INET6 &&
		    ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
			if (addr1->v6.sin6_port == addr2->v4.sin_port &&
			    addr1->v6.sin6_addr.s6_addr32[3] ==
			    addr2->v4.sin_addr.s_addr)
				return 1;
		}
		return 0;
	}
	if (addr1->v6.sin6_port != addr2->v6.sin6_port)
		return 0;
	if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
		return 0;
	/* If this is a linklocal address, compare the scope_id. */
	if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
		if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
		    (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
			return 0;
		}
	}

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jon Grimm
234
89.31%
4
50.00%
Xin Long
17
6.49%
1
12.50%
Sridhar Samudrala
7
2.67%
1
12.50%
Hideaki Yoshifuji / 吉藤英明
2
0.76%
1
12.50%
Brian Haley
2
0.76%
1
12.50%
Total
262
100.00%
8
100.00%

/* Initialize addr struct to INADDR_ANY. */


static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
{
	memset(addr, 0x00, sizeof(union sctp_addr));
	addr->v6.sin6_family = AF_INET6;
	addr->v6.sin6_port = port;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jon Grimm
42
97.67%
2
66.67%
Al Viro
1
2.33%
1
33.33%
Total
43
100.00%
3
100.00%

/* Is this a wildcard address? */


static int sctp_v6_is_any(const union sctp_addr *addr)
{
	return ipv6_addr_any(&addr->v6.sin6_addr);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jon Grimm
21
91.30%
1
50.00%
Brian Haley
2
8.70%
1
50.00%
Total
23
100.00%
2
100.00%

/* Should this be available for binding?   */


static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
{
	int type;
	struct net *net = sock_net(&sp->inet.sk);
	const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;

	type = ipv6_addr_type(in6);
	if (IPV6_ADDR_ANY == type)
		return 1;
	if (type == IPV6_ADDR_MAPPED) {
		if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
			return 0;
		sctp_v6_map_v4(addr);
		return sctp_get_af_specific(AF_INET)->available(addr, sp);
	}
	if (!(type & IPV6_ADDR_UNICAST))
		return 0;

	return sp->inet.freebind || net->ipv6.sysctl.ip_nonlocal_bind ||
		ipv6_chk_addr(net, in6, NULL, 0);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jon Grimm
99
66.89%
2
22.22%
Xin Long
28
18.92%
1
11.11%
Sridhar Samudrala
11
7.43%
1
11.11%
Eric W. Biedermann
4
2.70%
1
11.11%
Ville Nuorvala
2
1.35%
1
11.11%
Eric Dumazet
2
1.35%
1
11.11%
Daniel Lezcano
1
0.68%
1
11.11%
Arnaldo Carvalho de Melo
1
0.68%
1
11.11%
Total
148
100.00%
9
100.00%

/* This function checks if the address is a valid address to be used for
 * SCTP.
 *
 * Output:
 * Return 0 - If the address is a non-unicast or an illegal address.
 * Return 1 - If the address is a unicast.
 */


static int sctp_v6_addr_valid(union sctp_addr *addr,
			      struct sctp_sock *sp,
			      const struct sk_buff *skb)
{
	int ret = ipv6_addr_type(&addr->v6.sin6_addr);

	/* Support v4-mapped-v6 address. */
	if