cregit-Linux how code gets into the kernel

Release 4.11 net/sctp/protocol.c

Directory: net/sctp
/* SCTP kernel implementation
 * (C) Copyright IBM Corp. 2001, 2004
 * Copyright (c) 1999-2000 Cisco, Inc.
 * Copyright (c) 1999-2001 Motorola, Inc.
 * Copyright (c) 2001 Intel Corp.
 * Copyright (c) 2001 Nokia, Inc.
 * Copyright (c) 2001 La Monte H.P. Yarroll
 *
 * This file is part of the SCTP kernel implementation
 *
 * Initialization/cleanup for SCTP protocol support.
 *
 * 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:
 *    La Monte H.P. Yarroll <piggy@acm.org>
 *    Karl Knutson <karl@athena.chicago.il.us>
 *    Jon Grimm <jgrimm@us.ibm.com>
 *    Sridhar Samudrala <sri@us.ibm.com>
 *    Daisy Chang <daisyc@us.ibm.com>
 *    Ardelle Fan <ardelle.fan@intel.com>
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/seq_file.h>
#include <linux/bootmem.h>
#include <linux/highmem.h>
#include <linux/swap.h>
#include <linux/slab.h>
#include <net/net_namespace.h>
#include <net/protocol.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/route.h>
#include <net/sctp/sctp.h>
#include <net/addrconf.h>
#include <net/inet_common.h>
#include <net/inet_ecn.h>


#define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024)

/* Global data structures. */

struct sctp_globals sctp_globals __read_mostly;


struct idr sctp_assocs_id;

DEFINE_SPINLOCK(sctp_assocs_id_lock);


static struct sctp_pf *sctp_pf_inet6_specific;

static struct sctp_pf *sctp_pf_inet_specific;

static struct sctp_af *sctp_af_v4_specific;

static struct sctp_af *sctp_af_v6_specific;


struct kmem_cache *sctp_chunk_cachep __read_mostly;

struct kmem_cache *sctp_bucket_cachep __read_mostly;


long sysctl_sctp_mem[3];

int sysctl_sctp_rmem[3];

int sysctl_sctp_wmem[3];

/* Set up the proc fs entry for the SCTP protocol. */



static int __net_init sctp_proc_init(struct net *net)
{
#ifdef CONFIG_PROC_FS
	net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
	if (!net->sctp.proc_net_sctp)
		goto out_proc_net_sctp;
	if (sctp_snmp_proc_init(net))
		goto out_snmp_proc_init;
	if (sctp_eps_proc_init(net))
		goto out_eps_proc_init;
	if (sctp_assocs_proc_init(net))
		goto out_assocs_proc_init;
	if (sctp_remaddr_proc_init(net))
		goto out_remaddr_proc_init;

	return 0;

out_remaddr_proc_init:
	sctp_assocs_proc_exit(net);
out_assocs_proc_init:
	sctp_eps_proc_exit(net);
out_eps_proc_init:
	sctp_snmp_proc_exit(net);
out_snmp_proc_init:
	remove_proc_entry("sctp", net->proc_net);
	net->sctp.proc_net_sctp = NULL;
out_proc_net_sctp:
	return -ENOMEM;
#endif /* CONFIG_PROC_FS */
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Eric W. Biedermann5539.57%213.33%


Sridhar Samudrala2517.99%320.00%


Wei Yongjun2014.39%16.67%


Jon Grimm139.35%16.67%


Florian Westphal85.76%16.67%


Neil Horman64.32%16.67%


David S. Miller42.88%16.67%


Alexey Dobriyan32.16%16.67%


Randy Dunlap21.44%16.67%


Eric Dumazet10.72%16.67%


Christoph Paasch10.72%16.67%


Pavel Emelyanov10.72%16.67%


Total139100.00%15100.00%



/* Clean up the proc fs entry for the SCTP protocol.
 * Note: Do not make this __exit as it is used in the init error
 * path.
 */



static void sctp_proc_exit(struct net *net)
{
#ifdef CONFIG_PROC_FS
	sctp_snmp_proc_exit(net);
	sctp_eps_proc_exit(net);
	sctp_assocs_proc_exit(net);
	sctp_remaddr_proc_exit(net);

	remove_proc_entry("sctp", net->proc_net);
	net->sctp.proc_net_sctp = NULL;
#endif
}


Contributors
PersonTokensPropCommitsCommitProp
Eric W. Biedermann2852.83%222.22%


Jon Grimm1120.75%111.11%


Sridhar Samudrala713.21%333.33%


Florian Westphal59.43%111.11%


David S. Miller11.89%111.11%


Neil Horman11.89%111.11%


Total53100.00%9100.00%



/* Private helper to extract ipv4 address and stash them in
 * the protocol structure.
 */



static void sctp_v4_copy_addrlist(struct list_head *addrlist,
				  struct net_device *dev)
{
	struct in_device *in_dev;
	struct in_ifaddr *ifa;
	struct sctp_sockaddr_entry *addr;

	rcu_read_lock();
	if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
		rcu_read_unlock();
		return;
	}

	for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
		/* Add the address to the local list.  */
		addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
		if (addr) {
			addr->a.v4.sin_family = AF_INET;
			addr->a.v4.sin_port = 0;
			addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
			addr->valid = 1;
			INIT_LIST_HEAD(&addr->list);
			list_add_tail(&addr->list, addrlist);
		}
	}

	rcu_read_unlock();
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm12280.26%444.44%


Vladislav Yasevich149.21%111.11%


David S. Miller63.95%111.11%


Daniel Borkmann63.95%111.11%


Al Viro31.97%111.11%


Herbert Xu10.66%111.11%


Total152100.00%9100.00%



/* Extract our IP addresses from the system and stash them in the
 * protocol structure.
 */



static void sctp_get_local_addr_list(struct net *net)
{
	struct net_device *dev;
	struct list_head *pos;
	struct sctp_af *af;

	rcu_read_lock();
	for_each_netdev_rcu(net, dev) {
		list_for_each(pos, &sctp_address_families) {
			af = list_entry(pos, struct sctp_af, list);
			af->copy_addrlist(&net->sctp.local_addr_list, dev);
		}
	}
	rcu_read_unlock();
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm5270.27%330.00%


Eric W. Biedermann1114.86%220.00%


Eric Dumazet56.76%110.00%


Pavel Emelyanov34.05%110.00%


Sridhar Samudrala22.70%220.00%


Dave Jones11.35%110.00%


Total74100.00%10100.00%



/* Free the existing local addresses.  */



static void sctp_free_local_addr_list(struct net *net)
{
	struct sctp_sockaddr_entry *addr;
	struct list_head *pos, *temp;

	list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
		addr = list_entry(pos, struct sctp_sockaddr_entry, list);
		list_del(pos);
		kfree(addr);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm4783.93%233.33%


Eric W. Biedermann58.93%116.67%


Rusty Russell23.57%116.67%


Sridhar Samudrala11.79%116.67%


David S. Miller11.79%116.67%


Total56100.00%6100.00%



/* Copy the local addresses which are valid for 'scope' into 'bp'.  */



int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
			      sctp_scope_t scope, gfp_t gfp, int copy_flags)
{
	struct sctp_sockaddr_entry *addr;
	union sctp_addr laddr;
	int error = 0;

	rcu_read_lock();
	list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
		if (!addr->valid)
			continue;
		if (!sctp_in_scope(net, &addr->a, scope))
			continue;

		/* Now that the address is in scope, check to see if
                 * the address type is really supported by the local
                 * sock as well as the remote peer.
                 */
		if (addr->a.sa.sa_family == AF_INET &&
		    !(copy_flags & SCTP_ADDR4_PEERSUPP))
			continue;
		if (addr->a.sa.sa_family == AF_INET6 &&
		    (!(copy_flags & SCTP_ADDR6_ALLOWED) ||
		     !(copy_flags & SCTP_ADDR6_PEERSUPP)))
			continue;

		laddr = addr->a;
		/* also works for setting ipv6 address port */
		laddr.v4.sin_port = htons(bp->port);
		if (sctp_bind_addr_state(bp, &laddr) != -1)
			continue;

		error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a),
					   SCTP_ADDR_SRC, GFP_ATOMIC);
		if (error)
			break;
	}

	rcu_read_unlock();
	return error;
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm9649.74%526.32%


Xin Long5629.02%315.79%


Vladislav Yasevich189.33%210.53%


Eric W. Biedermann84.15%210.53%


Marcelo Ricardo Leitner73.63%15.26%


Al Viro52.59%315.79%


Sridhar Samudrala21.04%210.53%


David S. Miller10.52%15.26%


Total193100.00%19100.00%



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



static void sctp_v4_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_in *sa = &addr->v4;

	addr->v4.sin_family = AF_INET;

	if (is_saddr) {
		sa->sin_port = sh->source;
		sa->sin_addr.s_addr = ip_hdr(skb)->saddr;
	} else {
		sa->sin_port = sh->dest;
		sa->sin_addr.s_addr = ip_hdr(skb)->daddr;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm6565.66%133.33%


Marcelo Ricardo Leitner2828.28%133.33%


Arnaldo Carvalho de Melo66.06%133.33%


Total99100.00%3100.00%



/* Initialize an sctp_addr from a socket. */



static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
{
	addr->v4.sin_family = AF_INET;
	addr->v4.sin_port = 0;
	addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm4595.74%133.33%


Al Viro12.13%133.33%


Eric Dumazet12.13%133.33%


Total47100.00%3100.00%



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



static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
{
	inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm2993.55%133.33%


Eric Dumazet13.23%133.33%


Sridhar Samudrala13.23%133.33%


Total31100.00%3100.00%



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



static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
{
	inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
}


Contributors
PersonTokensPropCommitsCommitProp
Sridhar Samudrala3096.77%150.00%


Eric Dumazet13.23%150.00%


Total31100.00%2100.00%



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



static void sctp_v4_from_addr_param(union sctp_addr *addr,
				    union sctp_addr_param *param,
				    __be16 port, int iif)
{
	addr->v4.sin_family = AF_INET;
	addr->v4.sin_port = port;
	addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
}


Contributors
PersonTokensPropCommitsCommitProp
Sridhar Samudrala5398.15%150.00%


Al Viro11.85%150.00%


Total54100.00%2100.00%



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



static int sctp_v4_to_addr_param(const union sctp_addr *addr,
				 union sctp_addr_param *param)
{
	int length = sizeof(sctp_ipv4addr_param_t);

	param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
	param->v4.param_hdr.length = htons(length);
	param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;

	return length;
}


Contributors
PersonTokensPropCommitsCommitProp
Sridhar Samudrala6698.51%150.00%


Al Viro11.49%150.00%


Total67100.00%2100.00%



/* Initialize a sctp_addr from a dst_entry. */



static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
			      __be16 port)
{
	saddr->v4.sin_family = AF_INET;
	saddr->v4.sin_port = port;
	saddr->v4.sin_addr.s_addr = fl4->saddr;
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm2655.32%233.33%


Sridhar Samudrala1634.04%233.33%


David S. Miller48.51%116.67%


Al Viro12.13%116.67%


Total47100.00%6100.00%



/* Compare two addresses exactly. */



static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
			    const union sctp_addr *addr2)
{
	if (addr1->sa.sa_family != addr2->sa.sa_family)
		return 0;
	if (addr1->v4.sin_port != addr2->v4.sin_port)
		return 0;
	if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
		return 0;

	return 1;
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm7092.11%266.67%


Sridhar Samudrala67.89%133.33%


Total76100.00%3100.00%



/* Initialize addr struct to INADDR_ANY. */



static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
{
	addr->v4.sin_family = AF_INET;
	addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
	addr->v4.sin_port = port;
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm3990.70%250.00%


Al Viro49.30%250.00%


Total43100.00%4100.00%



/* Is this a wildcard address? */



static int sctp_v4_is_any(const union sctp_addr *addr)
{
	return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm2388.46%150.00%


Al Viro311.54%150.00%


Total26100.00%2100.00%



/* This function checks if the address is a valid address to be used for
 * SCTP binding.
 *
 * 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_v4_addr_valid(union sctp_addr *addr,
			      struct sctp_sock *sp,
			      const struct sk_buff *skb)
{
	/* IPv4 addresses not allowed */
	if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
		return 0;

	/* Is this a non-unicast address or a unusable SCTP address? */
	if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
		return 0;

	/* Is this a broadcast address? */
	if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
		return 0;

	return 1;
}


Contributors
PersonTokensPropCommitsCommitProp
Vladislav Yasevich3648.00%233.33%


Jon Grimm3546.67%233.33%


Eric Dumazet34.00%116.67%


Arnaldo Carvalho de Melo11.33%116.67%


Total75100.00%6100.00%



/* Should this be available for binding?   */



static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
{
	struct net *net = sock_net(&sp->inet.sk);
	int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);


	if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
	   ret != RTN_LOCAL &&
	   !sp->inet.freebind &&
	   !net->ipv4.sysctl_ip_nonlocal_bind)
		return 0;

	if (ipv6_only_sock(sctp_opt2sk(sp)))
		return 0;

	return 1;
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm5151.52%222.22%


Eric W. Biedermann1717.17%222.22%


Vladislav Yasevich1313.13%111.11%


Neil Horman1010.10%111.11%


Vincent Bernat44.04%111.11%


Al Viro33.03%111.11%


Arnaldo Carvalho de Melo11.01%111.11%


Total99100.00%9100.00%



/* Checking the loopback, private and other address scopes as defined in
 * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
 *
 * Level 0 - unusable SCTP addresses
 * Level 1 - loopback address
 * Level 2 - link-local addresses
 * Level 3 - private addresses.
 * Level 4 - global addresses
 * For INIT and INIT-ACK address list, let L be the level of
 * of requested destination address, sender and receiver
 * SHOULD include all of its addresses with level greater
 * than or equal to L.
 *
 * IPv4 scoping can be controlled through sysctl option
 * net.sctp.addr_scope_policy
 */



static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
{
	sctp_scope_t retval;

	/* Check for unusable SCTP addresses. */
	if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
		retval =  SCTP_SCOPE_UNUSABLE;
	} else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
		retval = SCTP_SCOPE_LOOPBACK;
	} else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
		retval = SCTP_SCOPE_LINK;
	} else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
		   ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
		   ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
		retval = SCTP_SCOPE_PRIVATE;
	} else {
		retval = SCTP_SCOPE_GLOBAL;
	}

	return retval;
}


Contributors
PersonTokensPropCommitsCommitProp
Sridhar Samudrala8365.87%133.33%


Joe Perches2519.84%133.33%


Jon Grimm1814.29%133.33%


Total126100.00%3100.00%



/* Returns a valid dst cache entry for the given source and destination ip
 * addresses. If an association is passed, trys to get a dst entry with a
 * source address that matches an address in the bind address list.
 */



static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
				struct flowi *fl, struct sock *sk)
{
	struct sctp_association *asoc = t->asoc;
	struct rtable *rt;
	struct flowi4 *fl4 = &fl->u.ip4;
	struct sctp_bind_addr *bp;
	struct sctp_sockaddr_entry *laddr;
	struct dst_entry *dst = NULL;
	union sctp_addr *daddr = &t->ipaddr;
	union sctp_addr dst_saddr;

	memset(fl4, 0x0, sizeof(struct flowi4));
	fl4->daddr  = daddr->v4.sin_addr.s_addr;
	fl4->fl4_dport = daddr->v4.sin_port;
	fl4->flowi4_proto = IPPROTO_SCTP;
	if (asoc) {
		fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
		fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
		fl4->fl4_sport = htons(asoc->base.bind_addr.port);
	}
	if (saddr) {
		fl4->saddr = saddr->v4.sin_addr.s_addr;
		fl4->fl4_sport = saddr->v4.sin_port;
	}

	pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
		 &fl4->saddr);

	rt = ip_route_output_key(sock_net(sk), fl4);
	if (!IS_ERR(rt))
		dst = &rt->dst;

	/* If there is no association or if a source address is passed, no
         * more validation is required.
         */
	if (!asoc || saddr)
		goto out;

	bp = &asoc->base.bind_addr;

	if (dst) {
		/* Walk through the bind address list and look for a bind
                 * address that matches the source address of the returned dst.
                 */
		sctp_v4_dst_saddr(&dst_saddr, fl4, 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;
			if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
				goto out_unlock;
		}
		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 a dst that
         * matches a bind address as the source address.
         */
	rcu_read_lock();
	list_for_each_entry_rcu(laddr, &bp->address_list, list) {
		struct net_device *odev;

		if (!laddr->valid)
			continue;
		if (laddr->state != SCTP_ADDR_SRC ||
		    AF_INET != laddr->a.sa.sa_family)
			continue;

		fl4->fl4_sport = laddr->a.v4.sin_port;
		flowi4_update_output(fl4,
				     asoc->base.sk->sk_bound_dev_if,
				     RT_CONN_FLAGS(asoc->base.sk),
				     daddr->v4.sin_addr.s_addr,
				     laddr->a.v4.sin_addr.s_addr);

		rt = ip_route_output_key(sock_net(sk), fl4);
		if (IS_ERR(rt))
			continue;

		if (!dst)
			dst = &rt->dst;

		/* Ensure the src address belongs to the output
                 * interface.
                 */
		odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
				     false);
		if (!odev || odev->ifindex != fl4->flowi4_oif) {
			if (&rt->dst != dst)
				dst_release(&rt->dst);
			continue;
		}

		if (dst != &rt->dst)
			dst_release(dst);
		dst = &rt->dst;
		break;
	}

out_unlock:
	rcu_read_unlock();
out:
	t->dst = dst;
	if (dst)
		pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
			 &fl4->daddr, &fl4->saddr);
	else
		pr_debug("no route\n");
}


Contributors
PersonTokensPropCommitsCommitProp
Sridhar Samudrala21836.27%412.50%


Marcelo Ricardo Leitner9315.47%412.50%


Vladislav Yasevich9014.98%412.50%


David S. Miller528.65%412.50%


Wei Yongjun355.82%13.12%


Xufeng Zhang335.49%13.12%


Jon Grimm284.66%412.50%


Gui Jianfeng142.33%13.12%


Michio Honda132.16%13.12%


Eric W. Biedermann81.33%13.12%


Harvey Harrison61.00%26.25%


Daniel Borkmann50.83%13.12%


Al Viro40.67%39.38%


Denis V. Lunev20.33%13.12%


Total601100.00%32100.00%



/* For v4, the source address is cached in the route entry(dst). So no need
 * to cache it separately and hence this is an empty routine.
 */



static void sctp_v4_get_saddr(struct sctp_sock *sk,
			      struct sctp_transport *t,
			      struct flowi *fl)
{
	union sctp_addr *saddr = &t->saddr;
	struct rtable *rt = (struct rtable *)t->dst;

	if (rt) {
		saddr->v4.sin_family = AF_INET;
		saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Sridhar Samudrala4965.33%342.86%


Vladislav Yasevich1418.67%114.29%


David S. Miller68.00%114.29%


Hideaki Yoshifuji / 吉藤英明56.67%114.29%


Jon Grimm11.33%114.29%


Total75100.00%7100.00%



/* What interface did this skb arrive on? */



static int sctp_v4_skb_iif(const struct sk_buff *skb)
{
	return inet_iif(skb);
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm1583.33%250.00%


Eric Dumazet211.11%125.00%


David S. Miller15.56%125.00%


Total18100.00%4100.00%



/* Was this packet marked by Explicit Congestion Notification? */



static int sctp_v4_is_ce(const struct sk_buff *skb)
{
	return INET_ECN_is_ce(ip_hdr(skb)->tos);
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm2086.96%150.00%


Arnaldo Carvalho de Melo313.04%150.00%


Total23100.00%2100.00%



/* Create and initialize a new sk for the socket returned by accept(). */



static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
					     struct sctp_association *asoc,
					     bool kern)
{
	struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
			sk->sk_prot, kern);
	struct inet_sock *newinet;

	if (!newsk)
		goto out;

	sock_init_data(NULL, newsk);

	sctp_copy_sock(newsk, sk, asoc);
	sock_reset_flag(newsk, SOCK_ZAPPED);

	newinet = inet_sk(newsk);

	newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;

	sk_refcnt_debug_inc(newsk);

	if (newsk->sk_prot->init(newsk)) {
		sk_common_release(newsk);
		newsk = NULL;
	}

out:
	return newsk;
}


Contributors
PersonTokensPropCommitsCommitProp
Sridhar Samudrala9570.37%214.29%


Arnaldo Carvalho de Melo118.15%535.71%


Vladislav Yasevich118.15%17.14%


Thomas Graf75.19%17.14%


David Howells42.96%17.14%


Hideaki Yoshifuji / 吉藤英明32.22%17.14%


Eric W. Biedermann32.22%214.29%


Eric Dumazet10.74%17.14%


Total135100.00%14100.00%






static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
{
	/* No address mapping for V4 sockets */
	return sizeof(struct sockaddr_in);
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm1354.17%133.33%


Jason Gunthorpe1041.67%133.33%


Arnaldo Carvalho de Melo14.17%133.33%


Total24100.00%3100.00%



/* Dump the v4 addr to the seq file. */



static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
{
	seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
}


Contributors
PersonTokensPropCommitsCommitProp
Sridhar Samudrala2893.33%150.00%


Harvey Harrison26.67%150.00%


Total30100.00%2100.00%






static void sctp_v4_ecn_capable(struct sock *sk)
{
	INET_ECN_xmit(sk);
}


Contributors
PersonTokensPropCommitsCommitProp
Vladislav Yasevich16100.00%1100.00%


Total16100.00%1100.00%






static void sctp_addr_wq_timeout_handler(unsigned long arg)
{
	struct net *net = (struct net *)arg;
	struct sctp_sockaddr_entry *addrw, *temp;
	struct sctp_sock *sp;

	spin_lock_bh(&net->sctp.addr_wq_lock);

	list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
		pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
			 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
			 addrw->state, addrw);

#if IS_ENABLED(CONFIG_IPV6)
		/* Now we send an ASCONF for each association */
		/* Note. we currently don't handle link local IPv6 addressees */
		if (addrw->a.sa.sa_family == AF_INET6) {
			struct in6_addr *in6;

			if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
			    IPV6_ADDR_LINKLOCAL)
				goto free_next;

			in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
			if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
			    addrw->state == SCTP_ADDR_NEW) {
				unsigned long timeo_val;

				pr_debug("%s: this is on DAD, trying %d sec "
					 "later\n", __func__,
					 SCTP_ADDRESS_TICK_DELAY);

				timeo_val = jiffies;
				timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
				mod_timer(&net->sctp.addr_wq_timer, timeo_val);
				break;
			}
		}
#endif
		list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
			struct sock *sk;

			sk = sctp_opt2sk(sp);
			/* ignore bound-specific endpoints */
			if (!sctp_is_ep_boundall(sk))
				continue;
			bh_lock_sock(sk);
			if (sctp_asconf_mgmt(sp, addrw) < 0)
				pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
			bh_unlock_sock(sk);
		}
#if IS_ENABLED(CONFIG_IPV6)
free_next:
#endif
		list_del(&addrw->list);
		kfree(addrw);
	}
	spin_unlock_bh(&net->sctp.addr_wq_lock);
}


Contributors
PersonTokensPropCommitsCommitProp
Michio Honda23477.23%112.50%


Eric W. Biedermann3511.55%112.50%


Daniel Borkmann154.95%112.50%


Daniel C. Halperin82.64%112.50%


David S. Miller72.31%112.50%


Wang Weidong20.66%112.50%


Stephen Hemminger10.33%112.50%


Eric Dumazet10.33%112.50%


Total303100.00%8100.00%






static void sctp_free_addr_wq(