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![Mianhan Liu](/assets/img/avatar_default.png)
nr_free_buffer_pages could be exposed through mm.h instead of swap.h. The advantage of this change is that it can reduce the obsolete includes. For example, net/ipv4/tcp.c wouldn't need swap.h any more since it has already included mm.h. Similarly, after checking all the other files, it comes that tcp.c, udp.c meter.c ,... follow the same rule, so these files can have swap.h removed too. Moreover, after preprocessing all the files that use nr_free_buffer_pages, it turns out that those files have already included mm.h.Thus, we can move nr_free_buffer_pages from swap.h to mm.h safely. This change will not affect the compilation of other files. Link: https://lkml.kernel.org/r/20210912133640.1624-1-liumh1@shanghaitech.edu.cn Signed-off-by: Mianhan Liu <liumh1@shanghaitech.edu.cn> Cc: Jakub Kicinski <kuba@kernel.org> CC: Ulf Hansson <ulf.hansson@linaro.org> Cc: "David S . Miller" <davem@davemloft.net> Cc: Simon Horman <horms@verge.net.au> Cc: Pravin B Shelar <pshelar@ovn.org> Cc: Vlad Yasevich <vyasevich@gmail.com> Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Cc: Matthew Wilcox <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1728 lines
46 KiB
C
1728 lines
46 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* 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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* 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/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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#include <net/udp_tunnel.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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in_dev_for_each_ifa_rcu(ifa, in_dev) {
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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_ALLOWED) ||
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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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memset(sa->sin_zero, 0, sizeof(sa->sin_zero));
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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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memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
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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 bool 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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if (ntohs(param->v4.param_hdr.length) < sizeof(struct sctp_ipv4addr_param))
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return false;
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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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memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
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return true;
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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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memset(saddr->v4.sin_zero, 0, sizeof(saddr->v4.sin_zero));
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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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memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
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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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* 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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ipv4_is_test_198(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 flowi _fl;
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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(&_fl, 0x0, sizeof(_fl));
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fl4->daddr = daddr->v4.sin_addr.s_addr;
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fl4->fl4_dport = daddr->v4.sin_port;
|
|
fl4->flowi4_proto = IPPROTO_SCTP;
|
|
if (asoc) {
|
|
fl4->flowi4_tos = RT_CONN_FLAGS_TOS(asoc->base.sk, tos);
|
|
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;
|
|
if (!fl4->fl4_sport)
|
|
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;
|
|
t->dst = dst;
|
|
memcpy(fl, &_fl, sizeof(_fl));
|
|
}
|
|
|
|
/* 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_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;
|
|
t->dst = dst;
|
|
memcpy(fl, &_fl, sizeof(_fl));
|
|
} else {
|
|
dst_release(&rt->dst);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
dst_release(dst);
|
|
dst = &rt->dst;
|
|
t->dst = dst;
|
|
memcpy(fl, &_fl, sizeof(_fl));
|
|
break;
|
|
}
|
|
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
out:
|
|
if (dst) {
|
|
pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
|
|
&fl->u.ip4.daddr, &fl->u.ip4.saddr);
|
|
} else {
|
|
t->dst = NULL;
|
|
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 */
|
|
memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
|
|
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;
|
|
}
|
|
|
|
static int sctp_udp_rcv(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
SCTP_INPUT_CB(skb)->encap_port = udp_hdr(skb)->source;
|
|
|
|
skb_set_transport_header(skb, sizeof(struct udphdr));
|
|
sctp_rcv(skb);
|
|
return 0;
|
|
}
|
|
|
|
int sctp_udp_sock_start(struct net *net)
|
|
{
|
|
struct udp_tunnel_sock_cfg tuncfg = {NULL};
|
|
struct udp_port_cfg udp_conf = {0};
|
|
struct socket *sock;
|
|
int err;
|
|
|
|
udp_conf.family = AF_INET;
|
|
udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
|
|
udp_conf.local_udp_port = htons(net->sctp.udp_port);
|
|
err = udp_sock_create(net, &udp_conf, &sock);
|
|
if (err) {
|
|
pr_err("Failed to create the SCTP UDP tunneling v4 sock\n");
|
|
return err;
|
|
}
|
|
|
|
tuncfg.encap_type = 1;
|
|
tuncfg.encap_rcv = sctp_udp_rcv;
|
|
tuncfg.encap_err_lookup = sctp_udp_v4_err;
|
|
setup_udp_tunnel_sock(net, sock, &tuncfg);
|
|
net->sctp.udp4_sock = sock->sk;
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
memset(&udp_conf, 0, sizeof(udp_conf));
|
|
|
|
udp_conf.family = AF_INET6;
|
|
udp_conf.local_ip6 = in6addr_any;
|
|
udp_conf.local_udp_port = htons(net->sctp.udp_port);
|
|
udp_conf.use_udp6_rx_checksums = true;
|
|
udp_conf.ipv6_v6only = true;
|
|
err = udp_sock_create(net, &udp_conf, &sock);
|
|
if (err) {
|
|
pr_err("Failed to create the SCTP UDP tunneling v6 sock\n");
|
|
udp_tunnel_sock_release(net->sctp.udp4_sock->sk_socket);
|
|
net->sctp.udp4_sock = NULL;
|
|
return err;
|
|
}
|
|
|
|
tuncfg.encap_type = 1;
|
|
tuncfg.encap_rcv = sctp_udp_rcv;
|
|
tuncfg.encap_err_lookup = sctp_udp_v6_err;
|
|
setup_udp_tunnel_sock(net, sock, &tuncfg);
|
|
net->sctp.udp6_sock = sock->sk;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
void sctp_udp_sock_stop(struct net *net)
|
|
{
|
|
if (net->sctp.udp4_sock) {
|
|
udp_tunnel_sock_release(net->sctp.udp4_sock->sk_socket);
|
|
net->sctp.udp4_sock = NULL;
|
|
}
|
|
if (net->sctp.udp6_sock) {
|
|
udp_tunnel_sock_release(net->sctp.udp6_sock->sk_socket);
|
|
net->sctp.udp6_sock = NULL;
|
|
}
|
|
}
|
|
|
|
/* 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 *t)
|
|
{
|
|
struct dst_entry *dst = dst_clone(t->dst);
|
|
struct flowi4 *fl4 = &t->fl.u.ip4;
|
|
struct sock *sk = skb->sk;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
__u8 dscp = inet->tos;
|
|
__be16 df = 0;
|
|
|
|
pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
|
|
skb->len, &fl4->saddr, &fl4->daddr);
|
|
|
|
if (t->dscp & SCTP_DSCP_SET_MASK)
|
|
dscp = t->dscp & SCTP_DSCP_VAL_MASK;
|
|
|
|
inet->pmtudisc = t->param_flags & SPP_PMTUD_ENABLE ? IP_PMTUDISC_DO
|
|
: IP_PMTUDISC_DONT;
|
|
SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
|
|
|
|
if (!t->encap_port || !sctp_sk(sk)->udp_port) {
|
|
skb_dst_set(skb, dst);
|
|
return __ip_queue_xmit(sk, skb, &t->fl, dscp);
|
|
}
|
|
|
|
if (skb_is_gso(skb))
|
|
skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM;
|
|
|
|
if (ip_dont_fragment(sk, dst) && !skb->ignore_df)
|
|
df = htons(IP_DF);
|
|
|
|
skb->encapsulation = 1;
|
|
skb_reset_inner_mac_header(skb);
|
|
skb_reset_inner_transport_header(skb);
|
|
skb_set_inner_ipproto(skb, IPPROTO_SCTP);
|
|
udp_tunnel_xmit_skb((struct rtable *)dst, sk, skb, fl4->saddr,
|
|
fl4->daddr, dscp, ip4_dst_hoplimit(dst), df,
|
|
sctp_sk(sk)->udp_port, t->encap_port, false, false);
|
|
return 0;
|
|
}
|
|
|
|
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,
|
|
.gettstamp = sock_gettstamp,
|
|
.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,
|
|
};
|
|
|
|
/* 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
|
|
};
|
|
|
|
static int sctp4_rcv(struct sk_buff *skb)
|
|
{
|
|
SCTP_INPUT_CB(skb)->encap_port = 0;
|
|
return sctp_rcv(skb);
|
|
}
|
|
|
|
/* Register with IP layer. */
|
|
static const struct net_protocol sctp_protocol = {
|
|
.handler = sctp4_rcv,
|
|
.err_handler = sctp_v4_err,
|
|
.no_policy = 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,
|
|
};
|
|
|
|
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;
|
|
|
|
/* Disable of Primary Path Switchover by default */
|
|
net->sctp.ps_retrans = SCTP_PS_RETRANS_MAX;
|
|
|
|
/* Enable pf state by default */
|
|
net->sctp.pf_enable = 1;
|
|
|
|
/* Ignore pf exposure feature by default */
|
|
net->sctp.pf_expose = SCTP_PF_EXPOSE_UNSET;
|
|
|
|
/* 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;
|
|
|
|
/* Enable ECN by default. */
|
|
net->sctp.ecn_enable = 1;
|
|
|
|
/* Set UDP tunneling listening port to 0 by default */
|
|
net->sctp.udp_port = 0;
|
|
|
|
/* Set remote encap port to 0 by default */
|
|
net->sctp.encap_port = 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_exit 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)
|
|
{
|
|
unsigned long nr_pages = totalram_pages();
|
|
unsigned long limit;
|
|
unsigned long goal;
|
|
int max_entry_order;
|
|
int num_entries;
|
|
int max_share;
|
|
int status;
|
|
int order;
|
|
int i;
|
|
|
|
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 it's needed because
|
|
* the hash function operates based on the assumption 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");
|