mirror of https://gitee.com/openkylin/linux.git
1620 lines
43 KiB
C
1620 lines
43 KiB
C
/* SCTP kernel implementation
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* (C) Copyright IBM Corp. 2001, 2004
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* Copyright (c) 1999-2000 Cisco, Inc.
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* Copyright (c) 1999-2001 Motorola, Inc.
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* Copyright (c) 2001 Intel Corp.
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* Copyright (c) 2001 Nokia, Inc.
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* Copyright (c) 2001 La Monte H.P. Yarroll
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*
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* This file is part of the SCTP kernel implementation
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*
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* Initialization/cleanup for SCTP protocol support.
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*
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* This SCTP implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This SCTP implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Please send any bug reports or fixes you make to the
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* email address(es):
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* lksctp developers <linux-sctp@vger.kernel.org>
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*
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* Written or modified by:
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* La Monte H.P. Yarroll <piggy@acm.org>
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* Karl Knutson <karl@athena.chicago.il.us>
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* Jon Grimm <jgrimm@us.ibm.com>
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* Sridhar Samudrala <sri@us.ibm.com>
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* Daisy Chang <daisyc@us.ibm.com>
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* Ardelle Fan <ardelle.fan@intel.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/inetdevice.h>
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#include <linux/seq_file.h>
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#include <linux/memblock.h>
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#include <linux/highmem.h>
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#include <linux/swap.h>
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#include <linux/slab.h>
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#include <net/net_namespace.h>
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#include <net/protocol.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/route.h>
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#include <net/sctp/sctp.h>
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#include <net/addrconf.h>
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#include <net/inet_common.h>
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#include <net/inet_ecn.h>
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#define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024)
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/* Global data structures. */
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struct sctp_globals sctp_globals __read_mostly;
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struct idr sctp_assocs_id;
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DEFINE_SPINLOCK(sctp_assocs_id_lock);
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static struct sctp_pf *sctp_pf_inet6_specific;
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static struct sctp_pf *sctp_pf_inet_specific;
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static struct sctp_af *sctp_af_v4_specific;
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static struct sctp_af *sctp_af_v6_specific;
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struct kmem_cache *sctp_chunk_cachep __read_mostly;
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struct kmem_cache *sctp_bucket_cachep __read_mostly;
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long sysctl_sctp_mem[3];
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int sysctl_sctp_rmem[3];
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int sysctl_sctp_wmem[3];
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/* Private helper to extract ipv4 address and stash them in
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* the protocol structure.
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*/
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static void sctp_v4_copy_addrlist(struct list_head *addrlist,
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struct net_device *dev)
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{
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struct in_device *in_dev;
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struct in_ifaddr *ifa;
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struct sctp_sockaddr_entry *addr;
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rcu_read_lock();
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if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
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rcu_read_unlock();
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return;
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}
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for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
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/* Add the address to the local list. */
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addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
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if (addr) {
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addr->a.v4.sin_family = AF_INET;
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addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
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addr->valid = 1;
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INIT_LIST_HEAD(&addr->list);
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list_add_tail(&addr->list, addrlist);
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}
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}
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rcu_read_unlock();
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}
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/* Extract our IP addresses from the system and stash them in the
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* protocol structure.
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*/
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static void sctp_get_local_addr_list(struct net *net)
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{
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struct net_device *dev;
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struct list_head *pos;
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struct sctp_af *af;
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rcu_read_lock();
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for_each_netdev_rcu(net, dev) {
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list_for_each(pos, &sctp_address_families) {
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af = list_entry(pos, struct sctp_af, list);
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af->copy_addrlist(&net->sctp.local_addr_list, dev);
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}
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}
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rcu_read_unlock();
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}
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/* Free the existing local addresses. */
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static void sctp_free_local_addr_list(struct net *net)
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{
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struct sctp_sockaddr_entry *addr;
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struct list_head *pos, *temp;
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list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
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addr = list_entry(pos, struct sctp_sockaddr_entry, list);
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list_del(pos);
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kfree(addr);
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}
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}
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/* Copy the local addresses which are valid for 'scope' into 'bp'. */
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int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
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enum sctp_scope scope, gfp_t gfp, int copy_flags)
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{
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struct sctp_sockaddr_entry *addr;
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union sctp_addr laddr;
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int error = 0;
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rcu_read_lock();
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list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
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if (!addr->valid)
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continue;
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if (!sctp_in_scope(net, &addr->a, scope))
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continue;
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/* Now that the address is in scope, check to see if
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* the address type is really supported by the local
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* sock as well as the remote peer.
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*/
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if (addr->a.sa.sa_family == AF_INET &&
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!(copy_flags & SCTP_ADDR4_PEERSUPP))
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continue;
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if (addr->a.sa.sa_family == AF_INET6 &&
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(!(copy_flags & SCTP_ADDR6_ALLOWED) ||
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!(copy_flags & SCTP_ADDR6_PEERSUPP)))
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continue;
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laddr = addr->a;
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/* also works for setting ipv6 address port */
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laddr.v4.sin_port = htons(bp->port);
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if (sctp_bind_addr_state(bp, &laddr) != -1)
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continue;
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error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a),
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SCTP_ADDR_SRC, GFP_ATOMIC);
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if (error)
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break;
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}
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rcu_read_unlock();
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return error;
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}
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/* Copy over any ip options */
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static void sctp_v4_copy_ip_options(struct sock *sk, struct sock *newsk)
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{
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struct inet_sock *newinet, *inet = inet_sk(sk);
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struct ip_options_rcu *inet_opt, *newopt = NULL;
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newinet = inet_sk(newsk);
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rcu_read_lock();
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inet_opt = rcu_dereference(inet->inet_opt);
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if (inet_opt) {
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newopt = sock_kmalloc(newsk, sizeof(*inet_opt) +
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inet_opt->opt.optlen, GFP_ATOMIC);
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if (newopt)
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memcpy(newopt, inet_opt, sizeof(*inet_opt) +
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inet_opt->opt.optlen);
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else
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pr_err("%s: Failed to copy ip options\n", __func__);
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}
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RCU_INIT_POINTER(newinet->inet_opt, newopt);
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rcu_read_unlock();
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}
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/* Account for the IP options */
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static int sctp_v4_ip_options_len(struct sock *sk)
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{
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struct inet_sock *inet = inet_sk(sk);
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struct ip_options_rcu *inet_opt;
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int len = 0;
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rcu_read_lock();
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inet_opt = rcu_dereference(inet->inet_opt);
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if (inet_opt)
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len = inet_opt->opt.optlen;
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rcu_read_unlock();
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return len;
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}
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/* Initialize a sctp_addr from in incoming skb. */
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static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
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int is_saddr)
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{
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/* Always called on head skb, so this is safe */
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struct sctphdr *sh = sctp_hdr(skb);
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struct sockaddr_in *sa = &addr->v4;
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addr->v4.sin_family = AF_INET;
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if (is_saddr) {
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sa->sin_port = sh->source;
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sa->sin_addr.s_addr = ip_hdr(skb)->saddr;
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} else {
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sa->sin_port = sh->dest;
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sa->sin_addr.s_addr = ip_hdr(skb)->daddr;
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}
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}
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/* Initialize an sctp_addr from a socket. */
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static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
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{
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addr->v4.sin_family = AF_INET;
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addr->v4.sin_port = 0;
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addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
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}
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/* Initialize sk->sk_rcv_saddr from sctp_addr. */
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static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
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{
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inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
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}
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/* Initialize sk->sk_daddr from sctp_addr. */
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static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
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{
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inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
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}
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/* Initialize a sctp_addr from an address parameter. */
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static void sctp_v4_from_addr_param(union sctp_addr *addr,
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union sctp_addr_param *param,
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__be16 port, int iif)
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{
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addr->v4.sin_family = AF_INET;
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addr->v4.sin_port = port;
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addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
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}
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/* Initialize an address parameter from a sctp_addr and return the length
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* of the address parameter.
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*/
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static int sctp_v4_to_addr_param(const union sctp_addr *addr,
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union sctp_addr_param *param)
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{
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int length = sizeof(struct sctp_ipv4addr_param);
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param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
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param->v4.param_hdr.length = htons(length);
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param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
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return length;
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}
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/* Initialize a sctp_addr from a dst_entry. */
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static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
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__be16 port)
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{
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saddr->v4.sin_family = AF_INET;
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saddr->v4.sin_port = port;
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saddr->v4.sin_addr.s_addr = fl4->saddr;
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}
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/* Compare two addresses exactly. */
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static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
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const union sctp_addr *addr2)
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{
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if (addr1->sa.sa_family != addr2->sa.sa_family)
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return 0;
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if (addr1->v4.sin_port != addr2->v4.sin_port)
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return 0;
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if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
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return 0;
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return 1;
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}
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/* Initialize addr struct to INADDR_ANY. */
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static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
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{
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addr->v4.sin_family = AF_INET;
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addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
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addr->v4.sin_port = port;
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}
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/* Is this a wildcard address? */
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static int sctp_v4_is_any(const union sctp_addr *addr)
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{
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return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
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}
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/* This function checks if the address is a valid address to be used for
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* SCTP binding.
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*
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* Output:
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* Return 0 - If the address is a non-unicast or an illegal address.
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* Return 1 - If the address is a unicast.
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*/
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static int sctp_v4_addr_valid(union sctp_addr *addr,
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struct sctp_sock *sp,
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const struct sk_buff *skb)
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{
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/* IPv4 addresses not allowed */
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if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
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return 0;
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/* Is this a non-unicast address or a unusable SCTP address? */
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if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
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return 0;
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/* Is this a broadcast address? */
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if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
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return 0;
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return 1;
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}
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/* Should this be available for binding? */
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static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
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{
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struct net *net = sock_net(&sp->inet.sk);
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int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
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if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
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ret != RTN_LOCAL &&
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!sp->inet.freebind &&
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!net->ipv4.sysctl_ip_nonlocal_bind)
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return 0;
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if (ipv6_only_sock(sctp_opt2sk(sp)))
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return 0;
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return 1;
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}
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/* Checking the loopback, private and other address scopes as defined in
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* RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
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* scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
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*
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* Level 0 - unusable SCTP addresses
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* Level 1 - loopback address
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* Level 2 - link-local addresses
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* Level 3 - private addresses.
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* Level 4 - global addresses
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* For INIT and INIT-ACK address list, let L be the level of
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* of requested destination address, sender and receiver
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* SHOULD include all of its addresses with level greater
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* than or equal to L.
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*
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* IPv4 scoping can be controlled through sysctl option
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* net.sctp.addr_scope_policy
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*/
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static enum sctp_scope sctp_v4_scope(union sctp_addr *addr)
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{
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enum sctp_scope retval;
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/* Check for unusable SCTP addresses. */
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if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
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retval = SCTP_SCOPE_UNUSABLE;
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} else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
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retval = SCTP_SCOPE_LOOPBACK;
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} else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
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retval = SCTP_SCOPE_LINK;
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} else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
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ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
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ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
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retval = SCTP_SCOPE_PRIVATE;
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} else {
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retval = SCTP_SCOPE_GLOBAL;
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}
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return retval;
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}
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/* Returns a valid dst cache entry for the given source and destination ip
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* addresses. If an association is passed, trys to get a dst entry with a
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* source address that matches an address in the bind address list.
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*/
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static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
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struct flowi *fl, struct sock *sk)
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{
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struct sctp_association *asoc = t->asoc;
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struct rtable *rt;
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struct flowi4 *fl4 = &fl->u.ip4;
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struct sctp_bind_addr *bp;
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struct sctp_sockaddr_entry *laddr;
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struct dst_entry *dst = NULL;
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union sctp_addr *daddr = &t->ipaddr;
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union sctp_addr dst_saddr;
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__u8 tos = inet_sk(sk)->tos;
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if (t->dscp & SCTP_DSCP_SET_MASK)
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tos = t->dscp & SCTP_DSCP_VAL_MASK;
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memset(fl4, 0x0, sizeof(struct flowi4));
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fl4->daddr = daddr->v4.sin_addr.s_addr;
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fl4->fl4_dport = daddr->v4.sin_port;
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fl4->flowi4_proto = IPPROTO_SCTP;
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if (asoc) {
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fl4->flowi4_tos = RT_CONN_FLAGS_TOS(asoc->base.sk, tos);
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fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
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fl4->fl4_sport = htons(asoc->base.bind_addr.port);
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}
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if (saddr) {
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fl4->saddr = saddr->v4.sin_addr.s_addr;
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if (!fl4->fl4_sport)
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fl4->fl4_sport = saddr->v4.sin_port;
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}
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pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
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&fl4->saddr);
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rt = ip_route_output_key(sock_net(sk), fl4);
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if (!IS_ERR(rt))
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dst = &rt->dst;
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/* If there is no association or if a source address is passed, no
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* more validation is required.
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*/
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if (!asoc || saddr)
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goto out;
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bp = &asoc->base.bind_addr;
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if (dst) {
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/* Walk through the bind address list and look for a bind
|
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* 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_TOS(asoc->base.sk, tos),
|
|
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;
|
|
|
|
/* 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 (!dst)
|
|
dst = &rt->dst;
|
|
else
|
|
dst_release(&rt->dst);
|
|
continue;
|
|
}
|
|
|
|
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");
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
/* What interface did this skb arrive on? */
|
|
static int sctp_v4_skb_iif(const struct sk_buff *skb)
|
|
{
|
|
return inet_iif(skb);
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/* 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);
|
|
|
|
sctp_v4_copy_ip_options(sk, newsk);
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
static void sctp_v4_ecn_capable(struct sock *sk)
|
|
{
|
|
INET_ECN_xmit(sk);
|
|
}
|
|
|
|
static void sctp_addr_wq_timeout_handler(struct timer_list *t)
|
|
{
|
|
struct net *net = from_timer(net, t, sctp.addr_wq_timer);
|
|
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);
|
|
}
|
|
|
|
static void sctp_free_addr_wq(struct net *net)
|
|
{
|
|
struct sctp_sockaddr_entry *addrw;
|
|
struct sctp_sockaddr_entry *temp;
|
|
|
|
spin_lock_bh(&net->sctp.addr_wq_lock);
|
|
del_timer(&net->sctp.addr_wq_timer);
|
|
list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
|
|
list_del(&addrw->list);
|
|
kfree(addrw);
|
|
}
|
|
spin_unlock_bh(&net->sctp.addr_wq_lock);
|
|
}
|
|
|
|
/* lookup the entry for the same address in the addr_waitq
|
|
* sctp_addr_wq MUST be locked
|
|
*/
|
|
static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
|
|
struct sctp_sockaddr_entry *addr)
|
|
{
|
|
struct sctp_sockaddr_entry *addrw;
|
|
|
|
list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
|
|
if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
|
|
continue;
|
|
if (addrw->a.sa.sa_family == AF_INET) {
|
|
if (addrw->a.v4.sin_addr.s_addr ==
|
|
addr->a.v4.sin_addr.s_addr)
|
|
return addrw;
|
|
} else if (addrw->a.sa.sa_family == AF_INET6) {
|
|
if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
|
|
&addr->a.v6.sin6_addr))
|
|
return addrw;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
|
|
{
|
|
struct sctp_sockaddr_entry *addrw;
|
|
unsigned long timeo_val;
|
|
|
|
/* first, we check if an opposite message already exist in the queue.
|
|
* If we found such message, it is removed.
|
|
* This operation is a bit stupid, but the DHCP client attaches the
|
|
* new address after a couple of addition and deletion of that address
|
|
*/
|
|
|
|
spin_lock_bh(&net->sctp.addr_wq_lock);
|
|
/* Offsets existing events in addr_wq */
|
|
addrw = sctp_addr_wq_lookup(net, addr);
|
|
if (addrw) {
|
|
if (addrw->state != cmd) {
|
|
pr_debug("%s: offsets existing entry for %d, addr:%pISc "
|
|
"in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
|
|
&net->sctp.addr_waitq);
|
|
|
|
list_del(&addrw->list);
|
|
kfree(addrw);
|
|
}
|
|
spin_unlock_bh(&net->sctp.addr_wq_lock);
|
|
return;
|
|
}
|
|
|
|
/* OK, we have to add the new address to the wait queue */
|
|
addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
|
|
if (addrw == NULL) {
|
|
spin_unlock_bh(&net->sctp.addr_wq_lock);
|
|
return;
|
|
}
|
|
addrw->state = cmd;
|
|
list_add_tail(&addrw->list, &net->sctp.addr_waitq);
|
|
|
|
pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
|
|
__func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
|
|
|
|
if (!timer_pending(&net->sctp.addr_wq_timer)) {
|
|
timeo_val = jiffies;
|
|
timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
|
|
mod_timer(&net->sctp.addr_wq_timer, timeo_val);
|
|
}
|
|
spin_unlock_bh(&net->sctp.addr_wq_lock);
|
|
}
|
|
|
|
/* Event handler for inet 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_inetaddr_event(struct notifier_block *this, unsigned long ev,
|
|
void *ptr)
|
|
{
|
|
struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
|
|
struct sctp_sockaddr_entry *addr = NULL;
|
|
struct sctp_sockaddr_entry *temp;
|
|
struct net *net = dev_net(ifa->ifa_dev->dev);
|
|
int found = 0;
|
|
|
|
switch (ev) {
|
|
case NETDEV_UP:
|
|
addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
|
|
if (addr) {
|
|
addr->a.v4.sin_family = AF_INET;
|
|
addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
|
|
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_INET &&
|
|
addr->a.v4.sin_addr.s_addr ==
|
|
ifa->ifa_local) {
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Initialize the control inode/socket with a control endpoint data
|
|
* structure. This endpoint is reserved exclusively for the OOTB processing.
|
|
*/
|
|
static int sctp_ctl_sock_init(struct net *net)
|
|
{
|
|
int err;
|
|
sa_family_t family = PF_INET;
|
|
|
|
if (sctp_get_pf_specific(PF_INET6))
|
|
family = PF_INET6;
|
|
|
|
err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
|
|
SOCK_SEQPACKET, IPPROTO_SCTP, net);
|
|
|
|
/* If IPv6 socket could not be created, try the IPv4 socket */
|
|
if (err < 0 && family == PF_INET6)
|
|
err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
|
|
SOCK_SEQPACKET, IPPROTO_SCTP,
|
|
net);
|
|
|
|
if (err < 0) {
|
|
pr_err("Failed to create the SCTP control socket\n");
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Register address family specific functions. */
|
|
int sctp_register_af(struct sctp_af *af)
|
|
{
|
|
switch (af->sa_family) {
|
|
case AF_INET:
|
|
if (sctp_af_v4_specific)
|
|
return 0;
|
|
sctp_af_v4_specific = af;
|
|
break;
|
|
case AF_INET6:
|
|
if (sctp_af_v6_specific)
|
|
return 0;
|
|
sctp_af_v6_specific = af;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&af->list);
|
|
list_add_tail(&af->list, &sctp_address_families);
|
|
return 1;
|
|
}
|
|
|
|
/* Get the table of functions for manipulating a particular address
|
|
* family.
|
|
*/
|
|
struct sctp_af *sctp_get_af_specific(sa_family_t family)
|
|
{
|
|
switch (family) {
|
|
case AF_INET:
|
|
return sctp_af_v4_specific;
|
|
case AF_INET6:
|
|
return sctp_af_v6_specific;
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* Common code to initialize a AF_INET msg_name. */
|
|
static void sctp_inet_msgname(char *msgname, int *addr_len)
|
|
{
|
|
struct sockaddr_in *sin;
|
|
|
|
sin = (struct sockaddr_in *)msgname;
|
|
*addr_len = sizeof(struct sockaddr_in);
|
|
sin->sin_family = AF_INET;
|
|
memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
|
|
}
|
|
|
|
/* Copy the primary address of the peer primary address as the msg_name. */
|
|
static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
|
|
int *addr_len)
|
|
{
|
|
struct sockaddr_in *sin, *sinfrom;
|
|
|
|
if (msgname) {
|
|
struct sctp_association *asoc;
|
|
|
|
asoc = event->asoc;
|
|
sctp_inet_msgname(msgname, addr_len);
|
|
sin = (struct sockaddr_in *)msgname;
|
|
sinfrom = &asoc->peer.primary_addr.v4;
|
|
sin->sin_port = htons(asoc->peer.port);
|
|
sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
|
|
}
|
|
}
|
|
|
|
/* Initialize and copy out a msgname from an inbound skb. */
|
|
static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
|
|
{
|
|
if (msgname) {
|
|
struct sctphdr *sh = sctp_hdr(skb);
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
|
|
|
|
sctp_inet_msgname(msgname, len);
|
|
sin->sin_port = sh->source;
|
|
sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
|
|
}
|
|
}
|
|
|
|
/* Do we support this AF? */
|
|
static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
|
|
{
|
|
/* PF_INET only supports AF_INET addresses. */
|
|
return AF_INET == family;
|
|
}
|
|
|
|
/* Address matching with wildcards allowed. */
|
|
static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
|
|
const union sctp_addr *addr2,
|
|
struct sctp_sock *opt)
|
|
{
|
|
/* PF_INET only supports AF_INET addresses. */
|
|
if (addr1->sa.sa_family != addr2->sa.sa_family)
|
|
return 0;
|
|
if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
|
|
htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
|
|
return 1;
|
|
if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Verify that provided sockaddr looks bindable. Common verification has
|
|
* already been taken care of.
|
|
*/
|
|
static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
|
|
{
|
|
return sctp_v4_available(addr, opt);
|
|
}
|
|
|
|
/* Verify that sockaddr looks sendable. Common verification has already
|
|
* been taken care of.
|
|
*/
|
|
static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/* Fill in Supported Address Type information for INIT and INIT-ACK
|
|
* chunks. Returns number of addresses supported.
|
|
*/
|
|
static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
|
|
__be16 *types)
|
|
{
|
|
types[0] = SCTP_PARAM_IPV4_ADDRESS;
|
|
return 1;
|
|
}
|
|
|
|
/* Wrapper routine that calls the ip transmit routine. */
|
|
static inline int sctp_v4_xmit(struct sk_buff *skb,
|
|
struct sctp_transport *transport)
|
|
{
|
|
struct inet_sock *inet = inet_sk(skb->sk);
|
|
__u8 dscp = inet->tos;
|
|
|
|
pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
|
|
skb->len, &transport->fl.u.ip4.saddr,
|
|
&transport->fl.u.ip4.daddr);
|
|
|
|
if (transport->dscp & SCTP_DSCP_SET_MASK)
|
|
dscp = transport->dscp & SCTP_DSCP_VAL_MASK;
|
|
|
|
inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
|
|
IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
|
|
|
|
SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
|
|
|
|
return __ip_queue_xmit(&inet->sk, skb, &transport->fl, dscp);
|
|
}
|
|
|
|
static struct sctp_af sctp_af_inet;
|
|
|
|
static struct sctp_pf sctp_pf_inet = {
|
|
.event_msgname = sctp_inet_event_msgname,
|
|
.skb_msgname = sctp_inet_skb_msgname,
|
|
.af_supported = sctp_inet_af_supported,
|
|
.cmp_addr = sctp_inet_cmp_addr,
|
|
.bind_verify = sctp_inet_bind_verify,
|
|
.send_verify = sctp_inet_send_verify,
|
|
.supported_addrs = sctp_inet_supported_addrs,
|
|
.create_accept_sk = sctp_v4_create_accept_sk,
|
|
.addr_to_user = sctp_v4_addr_to_user,
|
|
.to_sk_saddr = sctp_v4_to_sk_saddr,
|
|
.to_sk_daddr = sctp_v4_to_sk_daddr,
|
|
.copy_ip_options = sctp_v4_copy_ip_options,
|
|
.af = &sctp_af_inet
|
|
};
|
|
|
|
/* Notifier for inetaddr addition/deletion events. */
|
|
static struct notifier_block sctp_inetaddr_notifier = {
|
|
.notifier_call = sctp_inetaddr_event,
|
|
};
|
|
|
|
/* Socket operations. */
|
|
static const struct proto_ops inet_seqpacket_ops = {
|
|
.family = PF_INET,
|
|
.owner = THIS_MODULE,
|
|
.release = inet_release, /* Needs to be wrapped... */
|
|
.bind = inet_bind,
|
|
.connect = sctp_inet_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = inet_accept,
|
|
.getname = inet_getname, /* Semantics are different. */
|
|
.poll = sctp_poll,
|
|
.ioctl = inet_ioctl,
|
|
.listen = sctp_inet_listen,
|
|
.shutdown = inet_shutdown, /* Looks harmless. */
|
|
.setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
|
|
.getsockopt = sock_common_getsockopt,
|
|
.sendmsg = inet_sendmsg,
|
|
.recvmsg = inet_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_sock_common_setsockopt,
|
|
.compat_getsockopt = compat_sock_common_getsockopt,
|
|
#endif
|
|
};
|
|
|
|
/* Registration with AF_INET family. */
|
|
static struct inet_protosw sctp_seqpacket_protosw = {
|
|
.type = SOCK_SEQPACKET,
|
|
.protocol = IPPROTO_SCTP,
|
|
.prot = &sctp_prot,
|
|
.ops = &inet_seqpacket_ops,
|
|
.flags = SCTP_PROTOSW_FLAG
|
|
};
|
|
static struct inet_protosw sctp_stream_protosw = {
|
|
.type = SOCK_STREAM,
|
|
.protocol = IPPROTO_SCTP,
|
|
.prot = &sctp_prot,
|
|
.ops = &inet_seqpacket_ops,
|
|
.flags = SCTP_PROTOSW_FLAG
|
|
};
|
|
|
|
/* Register with IP layer. */
|
|
static const struct net_protocol sctp_protocol = {
|
|
.handler = sctp_rcv,
|
|
.err_handler = sctp_v4_err,
|
|
.no_policy = 1,
|
|
.netns_ok = 1,
|
|
.icmp_strict_tag_validation = 1,
|
|
};
|
|
|
|
/* IPv4 address related functions. */
|
|
static struct sctp_af sctp_af_inet = {
|
|
.sa_family = AF_INET,
|
|
.sctp_xmit = sctp_v4_xmit,
|
|
.setsockopt = ip_setsockopt,
|
|
.getsockopt = ip_getsockopt,
|
|
.get_dst = sctp_v4_get_dst,
|
|
.get_saddr = sctp_v4_get_saddr,
|
|
.copy_addrlist = sctp_v4_copy_addrlist,
|
|
.from_skb = sctp_v4_from_skb,
|
|
.from_sk = sctp_v4_from_sk,
|
|
.from_addr_param = sctp_v4_from_addr_param,
|
|
.to_addr_param = sctp_v4_to_addr_param,
|
|
.cmp_addr = sctp_v4_cmp_addr,
|
|
.addr_valid = sctp_v4_addr_valid,
|
|
.inaddr_any = sctp_v4_inaddr_any,
|
|
.is_any = sctp_v4_is_any,
|
|
.available = sctp_v4_available,
|
|
.scope = sctp_v4_scope,
|
|
.skb_iif = sctp_v4_skb_iif,
|
|
.is_ce = sctp_v4_is_ce,
|
|
.seq_dump_addr = sctp_v4_seq_dump_addr,
|
|
.ecn_capable = sctp_v4_ecn_capable,
|
|
.net_header_len = sizeof(struct iphdr),
|
|
.sockaddr_len = sizeof(struct sockaddr_in),
|
|
.ip_options_len = sctp_v4_ip_options_len,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_ip_setsockopt,
|
|
.compat_getsockopt = compat_ip_getsockopt,
|
|
#endif
|
|
};
|
|
|
|
struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
|
|
{
|
|
switch (family) {
|
|
case PF_INET:
|
|
return sctp_pf_inet_specific;
|
|
case PF_INET6:
|
|
return sctp_pf_inet6_specific;
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* Register the PF specific function table. */
|
|
int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
|
|
{
|
|
switch (family) {
|
|
case PF_INET:
|
|
if (sctp_pf_inet_specific)
|
|
return 0;
|
|
sctp_pf_inet_specific = pf;
|
|
break;
|
|
case PF_INET6:
|
|
if (sctp_pf_inet6_specific)
|
|
return 0;
|
|
sctp_pf_inet6_specific = pf;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static inline int init_sctp_mibs(struct net *net)
|
|
{
|
|
net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
|
|
if (!net->sctp.sctp_statistics)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static inline void cleanup_sctp_mibs(struct net *net)
|
|
{
|
|
free_percpu(net->sctp.sctp_statistics);
|
|
}
|
|
|
|
static void sctp_v4_pf_init(void)
|
|
{
|
|
/* Initialize the SCTP specific PF functions. */
|
|
sctp_register_pf(&sctp_pf_inet, PF_INET);
|
|
sctp_register_af(&sctp_af_inet);
|
|
}
|
|
|
|
static void sctp_v4_pf_exit(void)
|
|
{
|
|
list_del(&sctp_af_inet.list);
|
|
}
|
|
|
|
static int sctp_v4_protosw_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = proto_register(&sctp_prot, 1);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* Register SCTP(UDP and TCP style) with socket layer. */
|
|
inet_register_protosw(&sctp_seqpacket_protosw);
|
|
inet_register_protosw(&sctp_stream_protosw);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sctp_v4_protosw_exit(void)
|
|
{
|
|
inet_unregister_protosw(&sctp_stream_protosw);
|
|
inet_unregister_protosw(&sctp_seqpacket_protosw);
|
|
proto_unregister(&sctp_prot);
|
|
}
|
|
|
|
static int sctp_v4_add_protocol(void)
|
|
{
|
|
/* Register notifier for inet address additions/deletions. */
|
|
register_inetaddr_notifier(&sctp_inetaddr_notifier);
|
|
|
|
/* Register SCTP with inet layer. */
|
|
if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
|
|
return -EAGAIN;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sctp_v4_del_protocol(void)
|
|
{
|
|
inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
|
|
unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
|
|
}
|
|
|
|
static int __net_init sctp_defaults_init(struct net *net)
|
|
{
|
|
int status;
|
|
|
|
/*
|
|
* 14. Suggested SCTP Protocol Parameter Values
|
|
*/
|
|
/* The following protocol parameters are RECOMMENDED: */
|
|
/* RTO.Initial - 3 seconds */
|
|
net->sctp.rto_initial = SCTP_RTO_INITIAL;
|
|
/* RTO.Min - 1 second */
|
|
net->sctp.rto_min = SCTP_RTO_MIN;
|
|
/* RTO.Max - 60 seconds */
|
|
net->sctp.rto_max = SCTP_RTO_MAX;
|
|
/* RTO.Alpha - 1/8 */
|
|
net->sctp.rto_alpha = SCTP_RTO_ALPHA;
|
|
/* RTO.Beta - 1/4 */
|
|
net->sctp.rto_beta = SCTP_RTO_BETA;
|
|
|
|
/* Valid.Cookie.Life - 60 seconds */
|
|
net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
|
|
|
|
/* Whether Cookie Preservative is enabled(1) or not(0) */
|
|
net->sctp.cookie_preserve_enable = 1;
|
|
|
|
/* Default sctp sockets to use md5 as their hmac alg */
|
|
#if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
|
|
net->sctp.sctp_hmac_alg = "md5";
|
|
#elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
|
|
net->sctp.sctp_hmac_alg = "sha1";
|
|
#else
|
|
net->sctp.sctp_hmac_alg = NULL;
|
|
#endif
|
|
|
|
/* Max.Burst - 4 */
|
|
net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
|
|
|
|
/* Enable pf state by default */
|
|
net->sctp.pf_enable = 1;
|
|
|
|
/* Association.Max.Retrans - 10 attempts
|
|
* Path.Max.Retrans - 5 attempts (per destination address)
|
|
* Max.Init.Retransmits - 8 attempts
|
|
*/
|
|
net->sctp.max_retrans_association = 10;
|
|
net->sctp.max_retrans_path = 5;
|
|
net->sctp.max_retrans_init = 8;
|
|
|
|
/* Sendbuffer growth - do per-socket accounting */
|
|
net->sctp.sndbuf_policy = 0;
|
|
|
|
/* Rcvbuffer growth - do per-socket accounting */
|
|
net->sctp.rcvbuf_policy = 0;
|
|
|
|
/* HB.interval - 30 seconds */
|
|
net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
|
|
|
|
/* delayed SACK timeout */
|
|
net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
|
|
|
|
/* Disable ADDIP by default. */
|
|
net->sctp.addip_enable = 0;
|
|
net->sctp.addip_noauth = 0;
|
|
net->sctp.default_auto_asconf = 0;
|
|
|
|
/* Enable PR-SCTP by default. */
|
|
net->sctp.prsctp_enable = 1;
|
|
|
|
/* Disable RECONF by default. */
|
|
net->sctp.reconf_enable = 0;
|
|
|
|
/* Disable AUTH by default. */
|
|
net->sctp.auth_enable = 0;
|
|
|
|
/* Set SCOPE policy to enabled */
|
|
net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
|
|
|
|
/* Set the default rwnd update threshold */
|
|
net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
|
|
|
|
/* Initialize maximum autoclose timeout. */
|
|
net->sctp.max_autoclose = INT_MAX / HZ;
|
|
|
|
status = sctp_sysctl_net_register(net);
|
|
if (status)
|
|
goto err_sysctl_register;
|
|
|
|
/* Allocate and initialise sctp mibs. */
|
|
status = init_sctp_mibs(net);
|
|
if (status)
|
|
goto err_init_mibs;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
/* Initialize proc fs directory. */
|
|
status = sctp_proc_init(net);
|
|
if (status)
|
|
goto err_init_proc;
|
|
#endif
|
|
|
|
sctp_dbg_objcnt_init(net);
|
|
|
|
/* Initialize the local address list. */
|
|
INIT_LIST_HEAD(&net->sctp.local_addr_list);
|
|
spin_lock_init(&net->sctp.local_addr_lock);
|
|
sctp_get_local_addr_list(net);
|
|
|
|
/* Initialize the address event list */
|
|
INIT_LIST_HEAD(&net->sctp.addr_waitq);
|
|
INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
|
|
spin_lock_init(&net->sctp.addr_wq_lock);
|
|
net->sctp.addr_wq_timer.expires = 0;
|
|
timer_setup(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, 0);
|
|
|
|
return 0;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
err_init_proc:
|
|
cleanup_sctp_mibs(net);
|
|
#endif
|
|
err_init_mibs:
|
|
sctp_sysctl_net_unregister(net);
|
|
err_sysctl_register:
|
|
return status;
|
|
}
|
|
|
|
static void __net_exit sctp_defaults_exit(struct net *net)
|
|
{
|
|
/* Free the local address list */
|
|
sctp_free_addr_wq(net);
|
|
sctp_free_local_addr_list(net);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
remove_proc_subtree("sctp", net->proc_net);
|
|
net->sctp.proc_net_sctp = NULL;
|
|
#endif
|
|
cleanup_sctp_mibs(net);
|
|
sctp_sysctl_net_unregister(net);
|
|
}
|
|
|
|
static struct pernet_operations sctp_defaults_ops = {
|
|
.init = sctp_defaults_init,
|
|
.exit = sctp_defaults_exit,
|
|
};
|
|
|
|
static int __net_init sctp_ctrlsock_init(struct net *net)
|
|
{
|
|
int status;
|
|
|
|
/* Initialize the control inode/socket for handling OOTB packets. */
|
|
status = sctp_ctl_sock_init(net);
|
|
if (status)
|
|
pr_err("Failed to initialize the SCTP control sock\n");
|
|
|
|
return status;
|
|
}
|
|
|
|
static void __net_init sctp_ctrlsock_exit(struct net *net)
|
|
{
|
|
/* Free the control endpoint. */
|
|
inet_ctl_sock_destroy(net->sctp.ctl_sock);
|
|
}
|
|
|
|
static struct pernet_operations sctp_ctrlsock_ops = {
|
|
.init = sctp_ctrlsock_init,
|
|
.exit = sctp_ctrlsock_exit,
|
|
};
|
|
|
|
/* Initialize the universe into something sensible. */
|
|
static __init int sctp_init(void)
|
|
{
|
|
int i;
|
|
int status = -EINVAL;
|
|
unsigned long goal;
|
|
unsigned long limit;
|
|
unsigned long nr_pages = totalram_pages();
|
|
int max_share;
|
|
int order;
|
|
int num_entries;
|
|
int max_entry_order;
|
|
|
|
sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
|
|
|
|
/* Allocate bind_bucket and chunk caches. */
|
|
status = -ENOBUFS;
|
|
sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
|
|
sizeof(struct sctp_bind_bucket),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
NULL);
|
|
if (!sctp_bucket_cachep)
|
|
goto out;
|
|
|
|
sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
|
|
sizeof(struct sctp_chunk),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
NULL);
|
|
if (!sctp_chunk_cachep)
|
|
goto err_chunk_cachep;
|
|
|
|
status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
|
|
if (status)
|
|
goto err_percpu_counter_init;
|
|
|
|
/* Implementation specific variables. */
|
|
|
|
/* Initialize default stream count setup information. */
|
|
sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
|
|
sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
|
|
|
|
/* Initialize handle used for association ids. */
|
|
idr_init(&sctp_assocs_id);
|
|
|
|
limit = nr_free_buffer_pages() / 8;
|
|
limit = max(limit, 128UL);
|
|
sysctl_sctp_mem[0] = limit / 4 * 3;
|
|
sysctl_sctp_mem[1] = limit;
|
|
sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
|
|
|
|
/* Set per-socket limits to no more than 1/128 the pressure threshold*/
|
|
limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
|
|
max_share = min(4UL*1024*1024, limit);
|
|
|
|
sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
|
|
sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
|
|
sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
|
|
|
|
sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
|
|
sysctl_sctp_wmem[1] = 16*1024;
|
|
sysctl_sctp_wmem[2] = max(64*1024, max_share);
|
|
|
|
/* Size and allocate the association hash table.
|
|
* The methodology is similar to that of the tcp hash tables.
|
|
* Though not identical. Start by getting a goal size
|
|
*/
|
|
if (nr_pages >= (128 * 1024))
|
|
goal = nr_pages >> (22 - PAGE_SHIFT);
|
|
else
|
|
goal = nr_pages >> (24 - PAGE_SHIFT);
|
|
|
|
/* Then compute the page order for said goal */
|
|
order = get_order(goal);
|
|
|
|
/* Now compute the required page order for the maximum sized table we
|
|
* want to create
|
|
*/
|
|
max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES *
|
|
sizeof(struct sctp_bind_hashbucket));
|
|
|
|
/* Limit the page order by that maximum hash table size */
|
|
order = min(order, max_entry_order);
|
|
|
|
/* Allocate and initialize the endpoint hash table. */
|
|
sctp_ep_hashsize = 64;
|
|
sctp_ep_hashtable =
|
|
kmalloc_array(64, sizeof(struct sctp_hashbucket), GFP_KERNEL);
|
|
if (!sctp_ep_hashtable) {
|
|
pr_err("Failed endpoint_hash alloc\n");
|
|
status = -ENOMEM;
|
|
goto err_ehash_alloc;
|
|
}
|
|
for (i = 0; i < sctp_ep_hashsize; i++) {
|
|
rwlock_init(&sctp_ep_hashtable[i].lock);
|
|
INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
|
|
}
|
|
|
|
/* Allocate and initialize the SCTP port hash table.
|
|
* Note that order is initalized to start at the max sized
|
|
* table we want to support. If we can't get that many pages
|
|
* reduce the order and try again
|
|
*/
|
|
do {
|
|
sctp_port_hashtable = (struct sctp_bind_hashbucket *)
|
|
__get_free_pages(GFP_KERNEL | __GFP_NOWARN, order);
|
|
} while (!sctp_port_hashtable && --order > 0);
|
|
|
|
if (!sctp_port_hashtable) {
|
|
pr_err("Failed bind hash alloc\n");
|
|
status = -ENOMEM;
|
|
goto err_bhash_alloc;
|
|
}
|
|
|
|
/* Now compute the number of entries that will fit in the
|
|
* port hash space we allocated
|
|
*/
|
|
num_entries = (1UL << order) * PAGE_SIZE /
|
|
sizeof(struct sctp_bind_hashbucket);
|
|
|
|
/* And finish by rounding it down to the nearest power of two
|
|
* this wastes some memory of course, but its needed because
|
|
* the hash function operates based on the assumption that
|
|
* that the number of entries is a power of two
|
|
*/
|
|
sctp_port_hashsize = rounddown_pow_of_two(num_entries);
|
|
|
|
for (i = 0; i < sctp_port_hashsize; i++) {
|
|
spin_lock_init(&sctp_port_hashtable[i].lock);
|
|
INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
|
|
}
|
|
|
|
status = sctp_transport_hashtable_init();
|
|
if (status)
|
|
goto err_thash_alloc;
|
|
|
|
pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize,
|
|
num_entries);
|
|
|
|
sctp_sysctl_register();
|
|
|
|
INIT_LIST_HEAD(&sctp_address_families);
|
|
sctp_v4_pf_init();
|
|
sctp_v6_pf_init();
|
|
sctp_sched_ops_init();
|
|
|
|
status = register_pernet_subsys(&sctp_defaults_ops);
|
|
if (status)
|
|
goto err_register_defaults;
|
|
|
|
status = sctp_v4_protosw_init();
|
|
if (status)
|
|
goto err_protosw_init;
|
|
|
|
status = sctp_v6_protosw_init();
|
|
if (status)
|
|
goto err_v6_protosw_init;
|
|
|
|
status = register_pernet_subsys(&sctp_ctrlsock_ops);
|
|
if (status)
|
|
goto err_register_ctrlsock;
|
|
|
|
status = sctp_v4_add_protocol();
|
|
if (status)
|
|
goto err_add_protocol;
|
|
|
|
/* Register SCTP with inet6 layer. */
|
|
status = sctp_v6_add_protocol();
|
|
if (status)
|
|
goto err_v6_add_protocol;
|
|
|
|
if (sctp_offload_init() < 0)
|
|
pr_crit("%s: Cannot add SCTP protocol offload\n", __func__);
|
|
|
|
out:
|
|
return status;
|
|
err_v6_add_protocol:
|
|
sctp_v4_del_protocol();
|
|
err_add_protocol:
|
|
unregister_pernet_subsys(&sctp_ctrlsock_ops);
|
|
err_register_ctrlsock:
|
|
sctp_v6_protosw_exit();
|
|
err_v6_protosw_init:
|
|
sctp_v4_protosw_exit();
|
|
err_protosw_init:
|
|
unregister_pernet_subsys(&sctp_defaults_ops);
|
|
err_register_defaults:
|
|
sctp_v4_pf_exit();
|
|
sctp_v6_pf_exit();
|
|
sctp_sysctl_unregister();
|
|
free_pages((unsigned long)sctp_port_hashtable,
|
|
get_order(sctp_port_hashsize *
|
|
sizeof(struct sctp_bind_hashbucket)));
|
|
err_bhash_alloc:
|
|
sctp_transport_hashtable_destroy();
|
|
err_thash_alloc:
|
|
kfree(sctp_ep_hashtable);
|
|
err_ehash_alloc:
|
|
percpu_counter_destroy(&sctp_sockets_allocated);
|
|
err_percpu_counter_init:
|
|
kmem_cache_destroy(sctp_chunk_cachep);
|
|
err_chunk_cachep:
|
|
kmem_cache_destroy(sctp_bucket_cachep);
|
|
goto out;
|
|
}
|
|
|
|
/* Exit handler for the SCTP protocol. */
|
|
static __exit void sctp_exit(void)
|
|
{
|
|
/* BUG. This should probably do something useful like clean
|
|
* up all the remaining associations and all that memory.
|
|
*/
|
|
|
|
/* Unregister with inet6/inet layers. */
|
|
sctp_v6_del_protocol();
|
|
sctp_v4_del_protocol();
|
|
|
|
unregister_pernet_subsys(&sctp_ctrlsock_ops);
|
|
|
|
/* Free protosw registrations */
|
|
sctp_v6_protosw_exit();
|
|
sctp_v4_protosw_exit();
|
|
|
|
unregister_pernet_subsys(&sctp_defaults_ops);
|
|
|
|
/* Unregister with socket layer. */
|
|
sctp_v6_pf_exit();
|
|
sctp_v4_pf_exit();
|
|
|
|
sctp_sysctl_unregister();
|
|
|
|
free_pages((unsigned long)sctp_port_hashtable,
|
|
get_order(sctp_port_hashsize *
|
|
sizeof(struct sctp_bind_hashbucket)));
|
|
kfree(sctp_ep_hashtable);
|
|
sctp_transport_hashtable_destroy();
|
|
|
|
percpu_counter_destroy(&sctp_sockets_allocated);
|
|
|
|
rcu_barrier(); /* Wait for completion of call_rcu()'s */
|
|
|
|
kmem_cache_destroy(sctp_chunk_cachep);
|
|
kmem_cache_destroy(sctp_bucket_cachep);
|
|
}
|
|
|
|
module_init(sctp_init);
|
|
module_exit(sctp_exit);
|
|
|
|
/*
|
|
* __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
|
|
*/
|
|
MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
|
|
MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
|
|
MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
|
|
MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
|
|
module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
|
|
MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
|
|
MODULE_LICENSE("GPL");
|