cregit-Linux how code gets into the kernel

Release 4.11 net/sctp/endpointola.c

Directory: net/sctp
/* SCTP kernel implementation
 * Copyright (c) 1999-2000 Cisco, Inc.
 * Copyright (c) 1999-2001 Motorola, Inc.
 * Copyright (c) 2001-2002 International Business Machines, Corp.
 * 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
 *
 * This abstraction represents an SCTP endpoint.
 *
 * The 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.
 *
 * The 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@austin.ibm.com>
 *    Daisy Chang <daisyc@us.ibm.com>
 *    Dajiang Zhang <dajiang.zhang@nokia.com>
 */

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <linux/random.h>	/* get_random_bytes() */
#include <net/sock.h>
#include <net/ipv6.h>
#include <net/sctp/sctp.h>
#include <net/sctp/sm.h>

/* Forward declarations for internal helpers. */
static void sctp_endpoint_bh_rcv(struct work_struct *work);

/*
 * Initialize the base fields of the endpoint structure.
 */



static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
						struct sock *sk,
						gfp_t gfp)
{
	struct net *net = sock_net(sk);
	struct sctp_hmac_algo_param *auth_hmacs = NULL;
	struct sctp_chunks_param *auth_chunks = NULL;
	struct sctp_shared_key *null_key;
	int err;

	ep->digest = kzalloc(SCTP_SIGNATURE_SIZE, gfp);
	if (!ep->digest)
		return NULL;

	ep->auth_enable = net->sctp.auth_enable;
	if (ep->auth_enable) {
		/* Allocate space for HMACS and CHUNKS authentication
                 * variables.  There are arrays that we encode directly
                 * into parameters to make the rest of the operations easier.
                 */
		auth_hmacs = kzalloc(sizeof(sctp_hmac_algo_param_t) +
				sizeof(__u16) * SCTP_AUTH_NUM_HMACS, gfp);
		if (!auth_hmacs)
			goto nomem;

		auth_chunks = kzalloc(sizeof(sctp_chunks_param_t) +
					SCTP_NUM_CHUNK_TYPES, gfp);
		if (!auth_chunks)
			goto nomem;

		/* Initialize the HMACS parameter.
                 * SCTP-AUTH: Section 3.3
                 *    Every endpoint supporting SCTP chunk authentication MUST
                 *    support the HMAC based on the SHA-1 algorithm.
                 */
		auth_hmacs->param_hdr.type = SCTP_PARAM_HMAC_ALGO;
		auth_hmacs->param_hdr.length =
					htons(sizeof(sctp_paramhdr_t) + 2);
		auth_hmacs->hmac_ids[0] = htons(SCTP_AUTH_HMAC_ID_SHA1);

		/* Initialize the CHUNKS parameter */
		auth_chunks->param_hdr.type = SCTP_PARAM_CHUNKS;
		auth_chunks->param_hdr.length = htons(sizeof(sctp_paramhdr_t));

		/* If the Add-IP functionality is enabled, we must
                 * authenticate, ASCONF and ASCONF-ACK chunks
                 */
		if (net->sctp.addip_enable) {
			auth_chunks->chunks[0] = SCTP_CID_ASCONF;
			auth_chunks->chunks[1] = SCTP_CID_ASCONF_ACK;
			auth_chunks->param_hdr.length =
					htons(sizeof(sctp_paramhdr_t) + 2);
		}
	}

	/* Initialize the base structure. */
	/* What type of endpoint are we?  */
	ep->base.type = SCTP_EP_TYPE_SOCKET;

	/* Initialize the basic object fields. */
	atomic_set(&ep->base.refcnt, 1);
	ep->base.dead = false;

	/* Create an input queue.  */
	sctp_inq_init(&ep->base.inqueue);

	/* Set its top-half handler */
	sctp_inq_set_th_handler(&ep->base.inqueue, sctp_endpoint_bh_rcv);

	/* Initialize the bind addr area */
	sctp_bind_addr_init(&ep->base.bind_addr, 0);

	/* Remember who we are attached to.  */
	ep->base.sk = sk;
	sock_hold(ep->base.sk);

	/* Create the lists of associations.  */
	INIT_LIST_HEAD(&ep->asocs);

	/* Use SCTP specific send buffer space queues.  */
	ep->sndbuf_policy = net->sctp.sndbuf_policy;

	sk->sk_data_ready = sctp_data_ready;
	sk->sk_write_space = sctp_write_space;
	sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);

	/* Get the receive buffer policy for this endpoint */
	ep->rcvbuf_policy = net->sctp.rcvbuf_policy;

	/* Initialize the secret key used with cookie. */
	get_random_bytes(ep->secret_key, sizeof(ep->secret_key));

	/* SCTP-AUTH extensions*/
	INIT_LIST_HEAD(&ep->endpoint_shared_keys);
	null_key = sctp_auth_shkey_create(0, gfp);
	if (!null_key)
		goto nomem;

	list_add(&null_key->key_list, &ep->endpoint_shared_keys);

	/* Allocate and initialize transorms arrays for supported HMACs. */
	err = sctp_auth_init_hmacs(ep, gfp);
	if (err)
		goto nomem_hmacs;

	/* Add the null key to the endpoint shared keys list and
         * set the hmcas and chunks pointers.
         */
	ep->auth_hmacs_list = auth_hmacs;
	ep->auth_chunk_list = auth_chunks;
	ep->prsctp_enable = net->sctp.prsctp_enable;
	ep->reconf_enable = net->sctp.reconf_enable;

	return ep;

nomem_hmacs:
	sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
nomem:
	/* Free all allocations */
	kfree(auth_hmacs);
	kfree(auth_chunks);
	kfree(ep->digest);
	return NULL;

}


Contributors
PersonTokensPropCommitsCommitProp
Vladislav Yasevich29055.45%313.04%


Jon Grimm13425.62%417.39%


Eric W. Biedermann305.74%14.35%


Xin Long203.82%28.70%


Neil Horman112.10%28.70%


Vlad Yasevich101.91%14.35%


Al Viro71.34%28.70%


Wei Yongjun61.15%14.35%


Daniel Borkmann61.15%28.70%


Thomas Graf50.96%14.35%


Dan Carpenter10.19%14.35%


Sridhar Samudrala10.19%14.35%


Masanari Iida10.19%14.35%


Arnaldo Carvalho de Melo10.19%14.35%


Total523100.00%23100.00%



/* Create a sctp_endpoint with all that boring stuff initialized.
 * Returns NULL if there isn't enough memory.
 */



struct sctp_endpoint *sctp_endpoint_new(struct sock *sk, gfp_t gfp)
{
	struct sctp_endpoint *ep;

	/* Build a local endpoint. */
	ep = kzalloc(sizeof(*ep), gfp);
	if (!ep)
		goto fail;

	if (!sctp_endpoint_init(ep, sk, gfp))
		goto fail_init;

	SCTP_DBG_OBJCNT_INC(ep);
	return ep;

fail_init:
	kfree(ep);
fail:
	return NULL;
}


Contributors
PersonTokensPropCommitsCommitProp
Sridhar Samudrala7090.91%133.33%


Daniel Borkmann67.79%133.33%


Al Viro11.30%133.33%


Total77100.00%3100.00%



/* Add an association to an endpoint.  */



void sctp_endpoint_add_asoc(struct sctp_endpoint *ep,
			    struct sctp_association *asoc)
{
	struct sock *sk = ep->base.sk;

	/* If this is a temporary association, don't bother
         * since we'll be removing it shortly and don't
         * want anyone to find it anyway.
         */
	if (asoc->temp)
		return;

	/* Now just add it to our list of asocs */
	list_add_tail(&asoc->asocs, &ep->asocs);

	/* Increment the backlog value for a TCP-style listening socket. */
	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
		sk->sk_ack_backlog++;
}


Contributors
PersonTokensPropCommitsCommitProp
Sridhar Samudrala3245.71%228.57%


Jon Grimm2840.00%228.57%


Vladislav Yasevich811.43%114.29%


David S. Miller11.43%114.29%


Arnaldo Carvalho de Melo11.43%114.29%


Total70100.00%7100.00%



/* Free the endpoint structure.  Delay cleanup until
 * all users have released their reference count on this structure.
 */



void sctp_endpoint_free(struct sctp_endpoint *ep)
{
	ep->base.dead = true;

	ep->base.sk->sk_state = SCTP_SS_CLOSED;

	/* Unlink this endpoint, so we can't find it again! */
	sctp_unhash_endpoint(ep);

	sctp_endpoint_put(ep);
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm2153.85%240.00%


Vladislav Yasevich1641.03%120.00%


Daniel Borkmann12.56%120.00%


David S. Miller12.56%120.00%


Total39100.00%5100.00%



/* Final destructor for endpoint.  */



static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
{
	struct sock *sk;

	if (unlikely(!ep->base.dead)) {
		WARN(1, "Attempt to destroy undead endpoint %p!\n", ep);
		return;
	}

	/* Free the digest buffer */
	kfree(ep->digest);

	/* SCTP-AUTH: Free up AUTH releated data such as shared keys
         * chunks and hmacs arrays that were allocated
         */
	sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
	kfree(ep->auth_hmacs_list);
	kfree(ep->auth_chunk_list);

	/* AUTH - Free any allocated HMAC transform containers */
	sctp_auth_destroy_hmacs(ep->auth_hmacs);

	/* Cleanup. */
	sctp_inq_free(&ep->base.inqueue);
	sctp_bind_addr_free(&ep->base.bind_addr);

	memset(ep->secret_key, 0, sizeof(ep->secret_key));

	/* Give up our hold on the sock. */
	sk = ep->base.sk;
	if (sk != NULL) {
		/* Remove and free the port */
		if (sctp_sk(sk)->bind_hash)
			sctp_put_port(sk);

		sock_put(sk);
	}

	kfree(ep);
	SCTP_DBG_OBJCNT_DEC(ep);
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm6137.42%327.27%


Daniel Borkmann5835.58%436.36%


Vladislav Yasevich3923.93%218.18%


Arnaldo Carvalho de Melo42.45%19.09%


Sridhar Samudrala10.61%19.09%


Total163100.00%11100.00%



/* Hold a reference to an endpoint. */



void sctp_endpoint_hold(struct sctp_endpoint *ep)
{
	atomic_inc(&ep->base.refcnt);
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm20100.00%2100.00%


Total20100.00%2100.00%



/* Release a reference to an endpoint and clean up if there are
 * no more references.
 */



void sctp_endpoint_put(struct sctp_endpoint *ep)
{
	if (atomic_dec_and_test(&ep->base.refcnt))
		sctp_endpoint_destroy(ep);
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm27100.00%2100.00%


Total27100.00%2100.00%



/* Is this the endpoint we are looking for?  */



struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep,
					       struct net *net,
					       const union sctp_addr *laddr)
{
	struct sctp_endpoint *retval = NULL;

	if ((htons(ep->base.bind_addr.port) == laddr->v4.sin_port) &&
	    net_eq(sock_net(ep->base.sk), net)) {
		if (sctp_bind_addr_match(&ep->base.bind_addr, laddr,
					 sctp_sk(ep->base.sk)))
			retval = ep;
	}

	return retval;
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm7173.20%457.14%


Eric W. Biedermann2121.65%114.29%


Al Viro33.09%114.29%


Vladislav Yasevich22.06%114.29%


Total97100.00%7100.00%



/* Find the association that goes with this chunk.
 * We lookup the transport from hashtable at first, then get association
 * through t->assoc.
 */



struct sctp_association *sctp_endpoint_lookup_assoc(
	const struct sctp_endpoint *ep,
	const union sctp_addr *paddr,
	struct sctp_transport **transport)
{
	struct sctp_association *asoc = NULL;
	struct sctp_transport *t;

	*transport = NULL;

	/* If the local port is not set, there can't be any associations
         * on this endpoint.
         */
	if (!ep->base.bind_addr.port)
		return NULL;

	rcu_read_lock();
	t = sctp_epaddr_lookup_transport(ep, paddr);
	if (!t)
		goto out;

	*transport = t;
	asoc = t->asoc;
out:
	rcu_read_unlock();
	return asoc;
}


Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm4142.71%444.44%


Vladislav Yasevich3435.42%222.22%


Xin Long2121.88%333.33%


Total96100.00%9100.00%



/* Look for any peeled off association from the endpoint that matches the
 * given peer address.
 */



int sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
				const union sctp_addr *paddr)
{
	struct sctp_sockaddr_entry *addr;
	struct sctp_bind_addr *bp;
	struct net *net = sock_net(ep->base.sk);

	bp = &ep->base.bind_addr;
	/* This function is called with the socket lock held,
         * so the address_list can not change.
         */
	list_for_each_entry(addr, &bp->address_list, list) {
		if (sctp_has_association(net, &addr->a, paddr))
			return 1;
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Sridhar Samudrala5467.50%116.67%


Eric W. Biedermann1620.00%116.67%


Jon Grimm56.25%350.00%


Vladislav Yasevich56.25%116.67%


Total80100.00%6100.00%



/* Do delayed input processing.  This is scheduled by sctp_rcv().
 * This may be called on BH or task time.
 */



static void sctp_endpoint_bh_rcv(struct work_struct *work)
{
	struct sctp_endpoint *ep =
		container_of(work, struct sctp_endpoint,
			     base.inqueue.immediate);
	struct sctp_association *asoc;
	struct sock *sk;
	struct net *net;
	struct sctp_transport *transport;
	struct sctp_chunk *chunk;
	struct sctp_inq *inqueue;
	sctp_subtype_t subtype;
	sctp_state_t state;
	int error = 0;
	int first_time = 1;	/* is this the first time through the loop */

	if (ep->base.dead)
		return;

	asoc = NULL;
	inqueue = &ep->base.inqueue;
	sk = ep->base.sk;
	net = sock_net(sk);

	while (NULL != (chunk = sctp_inq_pop(inqueue))) {
		subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type);

		/* If the first chunk in the packet is AUTH, do special
                 * processing specified in Section 6.3 of SCTP-AUTH spec
                 */
		if (first_time && (subtype.chunk == SCTP_CID_AUTH)) {
			struct sctp_chunkhdr *next_hdr;

			next_hdr = sctp_inq_peek(inqueue);
			if (!next_hdr)
				goto normal;

			/* If the next chunk is COOKIE-ECHO, skip the AUTH
                         * chunk while saving a pointer to it so we can do
                         * Authentication later (during cookie-echo
                         * processing).
                         */
			if (next_hdr->type == SCTP_CID_COOKIE_ECHO) {
				chunk->auth_chunk = skb_clone(chunk->skb,
								GFP_ATOMIC);
				chunk->auth = 1;
				continue;
			}
		}
normal:
		/* We might have grown an association since last we
                 * looked, so try again.
                 *
                 * This happens when we've just processed our
                 * COOKIE-ECHO chunk.
                 */
		if (NULL == chunk->asoc) {
			asoc = sctp_endpoint_lookup_assoc(ep,
							  sctp_source(chunk),
							  &transport);
			chunk->asoc = asoc;
			chunk->transport = transport;
		}

		state = asoc ? asoc->state : SCTP_STATE_CLOSED;
		if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth)
			continue;

		/* Remember where the last DATA chunk came from so we
                 * know where to send the SACK.
                 */
		if (asoc && sctp_chunk_is_data(chunk))
			asoc->peer.last_data_from = chunk->transport;
		else {
			SCTP_INC_STATS(sock_net(ep->base.sk), SCTP_MIB_INCTRLCHUNKS);
			if (asoc)
				asoc->stats.ictrlchunks++;
		}

		if (chunk->transport)
			chunk->transport->last_time_heard = ktime_get();

		error = sctp_do_sm(net, SCTP_EVENT_T_CHUNK, subtype, state,
				   ep, asoc, chunk, GFP_ATOMIC);

		if (error && chunk)
			chunk->pdiscard = 1;

		/* Check to see if the endpoint is freed in response to
                 * the incoming chunk. If so, get out of the while loop.
                 */
		if (!sctp_sk(sk)->ep)
			break;

		if (first_time)
			first_time = 0;
	}
}

Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm22056.56%738.89%


Vladislav Yasevich9825.19%15.56%


Eric W. Biedermann235.91%211.11%


David Howells215.40%15.56%


Michele Baldessari133.34%15.56%


Sridhar Samudrala82.06%211.11%


David S. Miller20.51%15.56%


Daniel Borkmann20.51%15.56%


Hideaki Yoshifuji / 吉藤英明10.26%15.56%


Justin P. Mattock10.26%15.56%


Total389100.00%18100.00%




Overall Contributors
PersonTokensPropCommitsCommitProp
Jon Grimm66240.64%1117.74%


Vladislav Yasevich49230.20%914.52%


Sridhar Samudrala16810.31%69.68%


Eric W. Biedermann905.52%58.06%


Daniel Borkmann734.48%711.29%


Xin Long422.58%58.06%


David Howells231.41%11.61%


Michele Baldessari130.80%11.61%


David S. Miller120.74%23.23%


Neil Horman110.68%23.23%


Al Viro110.68%34.84%


Vlad Yasevich100.61%11.61%


Wei Yongjun60.37%11.61%


Arnaldo Carvalho de Melo60.37%23.23%


Thomas Graf50.31%11.61%


Dan Carpenter10.06%11.61%


Jeff Kirsher10.06%11.61%


Hideaki Yoshifuji / 吉藤英明10.06%11.61%


Justin P. Mattock10.06%11.61%


Masanari Iida10.06%11.61%


Total1629100.00%62100.00%


Directory: net/sctp



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