diff options
Diffstat (limited to 'net/sctp/protocol.c')
| -rw-r--r-- | net/sctp/protocol.c | 1401 |
1 files changed, 1401 insertions, 0 deletions
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c new file mode 100644 index 00000000..5027b83f --- /dev/null +++ b/net/sctp/protocol.c @@ -0,0 +1,1401 @@ +/* SCTP kernel implementation + * (C) Copyright IBM Corp. 2001, 2004 + * Copyright (c) 1999-2000 Cisco, Inc. + * Copyright (c) 1999-2001 Motorola, Inc. + * Copyright (c) 2001 Intel Corp. + * Copyright (c) 2001 Nokia, Inc. + * Copyright (c) 2001 La Monte H.P. Yarroll + * + * This file is part of the SCTP kernel implementation + * + * Initialization/cleanup for SCTP protocol support. + * + * This SCTP implementation is free software; + * you can redistribute it and/or modify it under the terms of + * the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This SCTP implementation is distributed in the hope that it + * will be useful, but WITHOUT ANY WARRANTY; without even the implied + * ************************ + * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * See the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GNU CC; see the file COPYING. If not, write to + * the Free Software Foundation, 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + * + * Please send any bug reports or fixes you make to the + * email address(es): + * lksctp developers <lksctp-developers@lists.sourceforge.net> + * + * Or submit a bug report through the following website: + * http://www.sf.net/projects/lksctp + * + * Written or modified by: + * La Monte H.P. Yarroll <piggy@acm.org> + * Karl Knutson <karl@athena.chicago.il.us> + * Jon Grimm <jgrimm@us.ibm.com> + * Sridhar Samudrala <sri@us.ibm.com> + * Daisy Chang <daisyc@us.ibm.com> + * Ardelle Fan <ardelle.fan@intel.com> + * + * Any bugs reported given to us we will try to fix... any fixes shared will + * be incorporated into the next SCTP release. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/netdevice.h> +#include <linux/inetdevice.h> +#include <linux/seq_file.h> +#include <linux/bootmem.h> +#include <linux/highmem.h> +#include <linux/swap.h> +#include <linux/slab.h> +#include <net/net_namespace.h> +#include <net/protocol.h> +#include <net/ip.h> +#include <net/ipv6.h> +#include <net/route.h> +#include <net/sctp/sctp.h> +#include <net/addrconf.h> +#include <net/inet_common.h> +#include <net/inet_ecn.h> + +/* Global data structures. */ +struct sctp_globals sctp_globals __read_mostly; +DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; + +#ifdef CONFIG_PROC_FS +struct proc_dir_entry *proc_net_sctp; +#endif + +struct idr sctp_assocs_id; +DEFINE_SPINLOCK(sctp_assocs_id_lock); + +/* This is the global socket data structure used for responding to + * the Out-of-the-blue (OOTB) packets. A control sock will be created + * for this socket at the initialization time. + */ +static struct sock *sctp_ctl_sock; + +static struct sctp_pf *sctp_pf_inet6_specific; +static struct sctp_pf *sctp_pf_inet_specific; +static struct sctp_af *sctp_af_v4_specific; +static struct sctp_af *sctp_af_v6_specific; + +struct kmem_cache *sctp_chunk_cachep __read_mostly; +struct kmem_cache *sctp_bucket_cachep __read_mostly; + +int sysctl_sctp_mem[3]; +int sysctl_sctp_rmem[3]; +int sysctl_sctp_wmem[3]; + +/* Return the address of the control sock. */ +struct sock *sctp_get_ctl_sock(void) +{ + return sctp_ctl_sock; +} + +/* Set up the proc fs entry for the SCTP protocol. */ +static __init int sctp_proc_init(void) +{ + if (percpu_counter_init(&sctp_sockets_allocated, 0)) + goto out_nomem; +#ifdef CONFIG_PROC_FS + if (!proc_net_sctp) { + proc_net_sctp = proc_mkdir("sctp", init_net.proc_net); + if (!proc_net_sctp) + goto out_free_percpu; + } + + if (sctp_snmp_proc_init()) + goto out_snmp_proc_init; + if (sctp_eps_proc_init()) + goto out_eps_proc_init; + if (sctp_assocs_proc_init()) + goto out_assocs_proc_init; + if (sctp_remaddr_proc_init()) + goto out_remaddr_proc_init; + + return 0; + +out_remaddr_proc_init: + sctp_assocs_proc_exit(); +out_assocs_proc_init: + sctp_eps_proc_exit(); +out_eps_proc_init: + sctp_snmp_proc_exit(); +out_snmp_proc_init: + if (proc_net_sctp) { + proc_net_sctp = NULL; + remove_proc_entry("sctp", init_net.proc_net); + } +out_free_percpu: + percpu_counter_destroy(&sctp_sockets_allocated); +#else + return 0; +#endif /* CONFIG_PROC_FS */ + +out_nomem: + return -ENOMEM; +} + +/* Clean up the proc fs entry for the SCTP protocol. + * Note: Do not make this __exit as it is used in the init error + * path. + */ +static void sctp_proc_exit(void) +{ +#ifdef CONFIG_PROC_FS + sctp_snmp_proc_exit(); + sctp_eps_proc_exit(); + sctp_assocs_proc_exit(); + sctp_remaddr_proc_exit(); + + if (proc_net_sctp) { + proc_net_sctp = NULL; + remove_proc_entry("sctp", init_net.proc_net); + } +#endif + percpu_counter_destroy(&sctp_sockets_allocated); +} + +/* Private helper to extract ipv4 address and stash them in + * the protocol structure. + */ +static void sctp_v4_copy_addrlist(struct list_head *addrlist, + struct net_device *dev) +{ + struct in_device *in_dev; + struct in_ifaddr *ifa; + struct sctp_sockaddr_entry *addr; + + rcu_read_lock(); + if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { + rcu_read_unlock(); + return; + } + + for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { + /* Add the address to the local list. */ + addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); + if (addr) { + addr->a.v4.sin_family = AF_INET; + addr->a.v4.sin_port = 0; + addr->a.v4.sin_addr.s_addr = ifa->ifa_local; + addr->valid = 1; + INIT_LIST_HEAD(&addr->list); + list_add_tail(&addr->list, addrlist); + } + } + + rcu_read_unlock(); +} + +/* Extract our IP addresses from the system and stash them in the + * protocol structure. + */ +static void sctp_get_local_addr_list(void) +{ + struct net_device *dev; + struct list_head *pos; + struct sctp_af *af; + + rcu_read_lock(); + for_each_netdev_rcu(&init_net, dev) { + __list_for_each(pos, &sctp_address_families) { + af = list_entry(pos, struct sctp_af, list); + af->copy_addrlist(&sctp_local_addr_list, dev); + } + } + rcu_read_unlock(); +} + +/* Free the existing local addresses. */ +static void sctp_free_local_addr_list(void) +{ + struct sctp_sockaddr_entry *addr; + struct list_head *pos, *temp; + + list_for_each_safe(pos, temp, &sctp_local_addr_list) { + addr = list_entry(pos, struct sctp_sockaddr_entry, list); + list_del(pos); + kfree(addr); + } +} + +void sctp_local_addr_free(struct rcu_head *head) +{ + struct sctp_sockaddr_entry *e = container_of(head, + struct sctp_sockaddr_entry, rcu); + kfree(e); +} + +/* Copy the local addresses which are valid for 'scope' into 'bp'. */ +int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope, + gfp_t gfp, int copy_flags) +{ + struct sctp_sockaddr_entry *addr; + int error = 0; + + rcu_read_lock(); + list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) { + if (!addr->valid) + continue; + if (sctp_in_scope(&addr->a, scope)) { + /* Now that the address is in scope, check to see if + * the address type is really supported by the local + * sock as well as the remote peer. + */ + if ((((AF_INET == addr->a.sa.sa_family) && + (copy_flags & SCTP_ADDR4_PEERSUPP))) || + (((AF_INET6 == addr->a.sa.sa_family) && + (copy_flags & SCTP_ADDR6_ALLOWED) && + (copy_flags & SCTP_ADDR6_PEERSUPP)))) { + error = sctp_add_bind_addr(bp, &addr->a, + SCTP_ADDR_SRC, GFP_ATOMIC); + if (error) + goto end_copy; + } + } + } + +end_copy: + rcu_read_unlock(); + return error; +} + +/* Initialize a sctp_addr from in incoming skb. */ +static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, + int is_saddr) +{ + void *from; + __be16 *port; + struct sctphdr *sh; + + port = &addr->v4.sin_port; + addr->v4.sin_family = AF_INET; + + sh = sctp_hdr(skb); + if (is_saddr) { + *port = sh->source; + from = &ip_hdr(skb)->saddr; + } else { + *port = sh->dest; + from = &ip_hdr(skb)->daddr; + } + memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); +} + +/* Initialize an sctp_addr from a socket. */ +static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) +{ + addr->v4.sin_family = AF_INET; + addr->v4.sin_port = 0; + addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr; +} + +/* Initialize sk->sk_rcv_saddr from sctp_addr. */ +static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) +{ + inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr; +} + +/* Initialize sk->sk_daddr from sctp_addr. */ +static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) +{ + inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr; +} + +/* Initialize a sctp_addr from an address parameter. */ +static void sctp_v4_from_addr_param(union sctp_addr *addr, + union sctp_addr_param *param, + __be16 port, int iif) +{ + addr->v4.sin_family = AF_INET; + addr->v4.sin_port = port; + addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; +} + +/* Initialize an address parameter from a sctp_addr and return the length + * of the address parameter. + */ +static int sctp_v4_to_addr_param(const union sctp_addr *addr, + union sctp_addr_param *param) +{ + int length = sizeof(sctp_ipv4addr_param_t); + + param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; + param->v4.param_hdr.length = htons(length); + param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; + + return length; +} + +/* Initialize a sctp_addr from a dst_entry. */ +static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst, + __be16 port) +{ + struct rtable *rt = (struct rtable *)dst; + saddr->v4.sin_family = AF_INET; + saddr->v4.sin_port = port; + saddr->v4.sin_addr.s_addr = rt->rt_src; +} + +/* Compare two addresses exactly. */ +static int sctp_v4_cmp_addr(const union sctp_addr *addr1, + const union sctp_addr *addr2) +{ + if (addr1->sa.sa_family != addr2->sa.sa_family) + return 0; + if (addr1->v4.sin_port != addr2->v4.sin_port) + return 0; + if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) + return 0; + + return 1; +} + +/* Initialize addr struct to INADDR_ANY. */ +static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) +{ + addr->v4.sin_family = AF_INET; + addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); + addr->v4.sin_port = port; +} + +/* Is this a wildcard address? */ +static int sctp_v4_is_any(const union sctp_addr *addr) +{ + return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; +} + +/* This function checks if the address is a valid address to be used for + * SCTP binding. + * + * Output: + * Return 0 - If the address is a non-unicast or an illegal address. + * Return 1 - If the address is a unicast. + */ +static int sctp_v4_addr_valid(union sctp_addr *addr, + struct sctp_sock *sp, + const struct sk_buff *skb) +{ + /* IPv4 addresses not allowed */ + if (sp && ipv6_only_sock(sctp_opt2sk(sp))) + return 0; + + /* Is this a non-unicast address or a unusable SCTP address? */ + if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) + return 0; + + /* Is this a broadcast address? */ + if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST) + return 0; + + return 1; +} + +/* Should this be available for binding? */ +static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) +{ + int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr); + + + if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && + ret != RTN_LOCAL && + !sp->inet.freebind && + !sysctl_ip_nonlocal_bind) + return 0; + + if (ipv6_only_sock(sctp_opt2sk(sp))) + return 0; + + return 1; +} + +/* Checking the loopback, private and other address scopes as defined in + * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 + * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. + * + * Level 0 - unusable SCTP addresses + * Level 1 - loopback address + * Level 2 - link-local addresses + * Level 3 - private addresses. + * Level 4 - global addresses + * For INIT and INIT-ACK address list, let L be the level of + * of requested destination address, sender and receiver + * SHOULD include all of its addresses with level greater + * than or equal to L. + * + * IPv4 scoping can be controlled through sysctl option + * net.sctp.addr_scope_policy + */ +static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) +{ + sctp_scope_t retval; + + /* Check for unusable SCTP addresses. */ + if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { + retval = SCTP_SCOPE_UNUSABLE; + } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { + retval = SCTP_SCOPE_LOOPBACK; + } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { + retval = SCTP_SCOPE_LINK; + } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || + ipv4_is_private_172(addr->v4.sin_addr.s_addr) || + ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { + retval = SCTP_SCOPE_PRIVATE; + } else { + retval = SCTP_SCOPE_GLOBAL; + } + + return retval; +} + +/* Returns a valid dst cache entry for the given source and destination ip + * addresses. If an association is passed, trys to get a dst entry with a + * source address that matches an address in the bind address list. + */ +static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc, + union sctp_addr *daddr, + union sctp_addr *saddr) +{ + struct rtable *rt; + struct flowi fl; + struct sctp_bind_addr *bp; + struct sctp_sockaddr_entry *laddr; + struct dst_entry *dst = NULL; + union sctp_addr dst_saddr; + + memset(&fl, 0x0, sizeof(struct flowi)); + fl.fl4_dst = daddr->v4.sin_addr.s_addr; + fl.fl_ip_dport = daddr->v4.sin_port; + fl.proto = IPPROTO_SCTP; + if (asoc) { + fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk); + fl.oif = asoc->base.sk->sk_bound_dev_if; + fl.fl_ip_sport = htons(asoc->base.bind_addr.port); + } + if (saddr) { + fl.fl4_src = saddr->v4.sin_addr.s_addr; + fl.fl_ip_sport = saddr->v4.sin_port; + } + + SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ", + __func__, &fl.fl4_dst, &fl.fl4_src); + + if (!ip_route_output_key(&init_net, &rt, &fl)) { + dst = &rt->dst; + } + + /* If there is no association or if a source address is passed, no + * more validation is required. + */ + if (!asoc || saddr) + goto out; + + bp = &asoc->base.bind_addr; + + if (dst) { + /* Walk through the bind address list and look for a bind + * address that matches the source address of the returned dst. + */ + sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port)); + rcu_read_lock(); + list_for_each_entry_rcu(laddr, &bp->address_list, list) { + if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC)) + 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) { + if (!laddr->valid) + continue; + if ((laddr->state == SCTP_ADDR_SRC) && + (AF_INET == laddr->a.sa.sa_family)) { + fl.fl4_src = laddr->a.v4.sin_addr.s_addr; + fl.fl_ip_sport = laddr->a.v4.sin_port; + if (!ip_route_output_key(&init_net, &rt, &fl)) { + dst = &rt->dst; + goto out_unlock; + } + } + } + +out_unlock: + rcu_read_unlock(); +out: + if (dst) + SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n", + &rt->rt_dst, &rt->rt_src); + else + SCTP_DEBUG_PRINTK("NO ROUTE\n"); + + return dst; +} + +/* 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_association *asoc, + struct dst_entry *dst, + union sctp_addr *daddr, + union sctp_addr *saddr) +{ + struct rtable *rt = (struct rtable *)dst; + + if (!asoc) + return; + + if (rt) { + saddr->v4.sin_family = AF_INET; + saddr->v4.sin_port = htons(asoc->base.bind_addr.port); + saddr->v4.sin_addr.s_addr = rt->rt_src; + } +} + +/* What interface did this skb arrive on? */ +static int sctp_v4_skb_iif(const struct sk_buff *skb) +{ + return skb_rtable(skb)->rt_iif; +} + +/* 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) +{ + struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, + sk->sk_prot); + struct inet_sock *newinet; + + if (!newsk) + goto out; + + sock_init_data(NULL, newsk); + + sctp_copy_sock(newsk, sk, asoc); + sock_reset_flag(newsk, SOCK_ZAPPED); + + newinet = inet_sk(newsk); + + newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; + + sk_refcnt_debug_inc(newsk); + + if (newsk->sk_prot->init(newsk)) { + sk_common_release(newsk); + newsk = NULL; + } + +out: + return newsk; +} + +/* Map address, empty for v4 family */ +static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) +{ + /* Empty */ +} + +/* 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); +} + +/* 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; + int found = 0; + + if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net)) + return NOTIFY_DONE; + + switch (ev) { + case NETDEV_UP: + addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); + if (addr) { + addr->a.v4.sin_family = AF_INET; + addr->a.v4.sin_port = 0; + addr->a.v4.sin_addr.s_addr = ifa->ifa_local; + addr->valid = 1; + spin_lock_bh(&sctp_local_addr_lock); + list_add_tail_rcu(&addr->list, &sctp_local_addr_list); + spin_unlock_bh(&sctp_local_addr_lock); + } + break; + case NETDEV_DOWN: + spin_lock_bh(&sctp_local_addr_lock); + list_for_each_entry_safe(addr, temp, + &sctp_local_addr_list, list) { + if (addr->a.sa.sa_family == AF_INET && + addr->a.v4.sin_addr.s_addr == + ifa->ifa_local) { + found = 1; + addr->valid = 0; + list_del_rcu(&addr->list); + break; + } + } + spin_unlock_bh(&sctp_local_addr_lock); + if (found) + call_rcu(&addr->rcu, sctp_local_addr_free); + 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(void) +{ + int err; + sa_family_t family = PF_INET; + + if (sctp_get_pf_specific(PF_INET6)) + family = PF_INET6; + + err = inet_ctl_sock_create(&sctp_ctl_sock, family, + SOCK_SEQPACKET, IPPROTO_SCTP, &init_net); + + /* If IPv6 socket could not be created, try the IPv4 socket */ + if (err < 0 && family == PF_INET6) + err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET, + SOCK_SEQPACKET, IPPROTO_SCTP, + &init_net); + + if (err < 0) { + printk(KERN_ERR + "SCTP: 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); + + SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", + __func__, skb, skb->len, + &skb_rtable(skb)->rt_src, + &skb_rtable(skb)->rt_dst); + + inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? + IP_PMTUDISC_DO : IP_PMTUDISC_DONT; + + SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); + return ip_queue_xmit(skb); +} + +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_v4map = sctp_v4_addr_v4map, + .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 = inet_dgram_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 = sock_common_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, + .no_check = 0, + .flags = SCTP_PROTOSW_FLAG +}; +static struct inet_protosw sctp_stream_protosw = { + .type = SOCK_STREAM, + .protocol = IPPROTO_SCTP, + .prot = &sctp_prot, + .ops = &inet_seqpacket_ops, + .no_check = 0, + .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, +}; + +/* 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, + .to_sk_saddr = sctp_v4_to_sk_saddr, + .to_sk_daddr = sctp_v4_to_sk_daddr, + .from_addr_param = sctp_v4_from_addr_param, + .to_addr_param = sctp_v4_to_addr_param, + .dst_saddr = sctp_v4_dst_saddr, + .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), +#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(void) +{ + return snmp_mib_init((void __percpu **)sctp_statistics, + sizeof(struct sctp_mib), + __alignof__(struct sctp_mib)); +} + +static inline void cleanup_sctp_mibs(void) +{ + snmp_mib_free((void __percpu **)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); +} + +/* Initialize the universe into something sensible. */ +SCTP_STATIC __init int sctp_init(void) +{ + int i; + int status = -EINVAL; + unsigned long goal; + unsigned long limit; + unsigned long nr_pages; + int max_share; + int order; + + /* SCTP_DEBUG sanity check. */ + if (!sctp_sanity_check()) + goto out; + + /* 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; + + /* Allocate and initialise sctp mibs. */ + status = init_sctp_mibs(); + if (status) + goto err_init_mibs; + + /* Initialize proc fs directory. */ + status = sctp_proc_init(); + if (status) + goto err_init_proc; + + /* Initialize object count debugging. */ + sctp_dbg_objcnt_init(); + + /* + * 14. Suggested SCTP Protocol Parameter Values + */ + /* The following protocol parameters are RECOMMENDED: */ + /* RTO.Initial - 3 seconds */ + sctp_rto_initial = SCTP_RTO_INITIAL; + /* RTO.Min - 1 second */ + sctp_rto_min = SCTP_RTO_MIN; + /* RTO.Max - 60 seconds */ + sctp_rto_max = SCTP_RTO_MAX; + /* RTO.Alpha - 1/8 */ + sctp_rto_alpha = SCTP_RTO_ALPHA; + /* RTO.Beta - 1/4 */ + sctp_rto_beta = SCTP_RTO_BETA; + + /* Valid.Cookie.Life - 60 seconds */ + sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; + + /* Whether Cookie Preservative is enabled(1) or not(0) */ + sctp_cookie_preserve_enable = 1; + + /* Max.Burst - 4 */ + sctp_max_burst = SCTP_DEFAULT_MAX_BURST; + + /* Association.Max.Retrans - 10 attempts + * Path.Max.Retrans - 5 attempts (per destination address) + * Max.Init.Retransmits - 8 attempts + */ + sctp_max_retrans_association = 10; + sctp_max_retrans_path = 5; + sctp_max_retrans_init = 8; + + /* Sendbuffer growth - do per-socket accounting */ + sctp_sndbuf_policy = 0; + + /* Rcvbuffer growth - do per-socket accounting */ + sctp_rcvbuf_policy = 0; + + /* HB.interval - 30 seconds */ + sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; + + /* delayed SACK timeout */ + sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; + + /* 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); + + /* Set the pressure threshold to be a fraction of global memory that + * is up to 1/2 at 256 MB, decreasing toward zero with the amount of + * memory, with a floor of 128 pages. + * Note this initializes the data in sctpv6_prot too + * Unabashedly stolen from tcp_init + */ + nr_pages = totalram_pages - totalhigh_pages; + limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); + limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); + 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 *(sizeof(struct sk_buff) + 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. + */ + if (totalram_pages >= (128 * 1024)) + goal = totalram_pages >> (22 - PAGE_SHIFT); + else + goal = totalram_pages >> (24 - PAGE_SHIFT); + + for (order = 0; (1UL << order) < goal; order++) + ; + + do { + sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / + sizeof(struct sctp_hashbucket); + if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) + continue; + sctp_assoc_hashtable = (struct sctp_hashbucket *) + __get_free_pages(GFP_ATOMIC, order); + } while (!sctp_assoc_hashtable && --order > 0); + if (!sctp_assoc_hashtable) { + printk(KERN_ERR "SCTP: Failed association hash alloc.\n"); + status = -ENOMEM; + goto err_ahash_alloc; + } + for (i = 0; i < sctp_assoc_hashsize; i++) { + rwlock_init(&sctp_assoc_hashtable[i].lock); + INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); + } + + /* Allocate and initialize the endpoint hash table. */ + sctp_ep_hashsize = 64; + sctp_ep_hashtable = (struct sctp_hashbucket *) + kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); + if (!sctp_ep_hashtable) { + printk(KERN_ERR "SCTP: 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. */ + do { + sctp_port_hashsize = (1UL << order) * PAGE_SIZE / + sizeof(struct sctp_bind_hashbucket); + if ((sctp_port_hashsize > (64 * 1024)) && order > 0) + continue; + sctp_port_hashtable = (struct sctp_bind_hashbucket *) + __get_free_pages(GFP_ATOMIC, order); + } while (!sctp_port_hashtable && --order > 0); + if (!sctp_port_hashtable) { + printk(KERN_ERR "SCTP: Failed bind hash alloc."); + status = -ENOMEM; + goto err_bhash_alloc; + } + for (i = 0; i < sctp_port_hashsize; i++) { + spin_lock_init(&sctp_port_hashtable[i].lock); + INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); + } + + printk(KERN_INFO "SCTP: Hash tables configured " + "(established %d bind %d)\n", + sctp_assoc_hashsize, sctp_port_hashsize); + + /* Disable ADDIP by default. */ + sctp_addip_enable = 0; + sctp_addip_noauth = 0; + + /* Enable PR-SCTP by default. */ + sctp_prsctp_enable = 1; + + /* Disable AUTH by default. */ + sctp_auth_enable = 0; + + /* Set SCOPE policy to enabled */ + sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE; + + /* Set the default rwnd update threshold */ + sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; + + sctp_sysctl_register(); + + INIT_LIST_HEAD(&sctp_address_families); + sctp_v4_pf_init(); + sctp_v6_pf_init(); + + /* Initialize the local address list. */ + INIT_LIST_HEAD(&sctp_local_addr_list); + spin_lock_init(&sctp_local_addr_lock); + sctp_get_local_addr_list(); + + status = sctp_v4_protosw_init(); + + if (status) + goto err_protosw_init; + + status = sctp_v6_protosw_init(); + if (status) + goto err_v6_protosw_init; + + /* Initialize the control inode/socket for handling OOTB packets. */ + if ((status = sctp_ctl_sock_init())) { + printk (KERN_ERR + "SCTP: Failed to initialize the SCTP control sock.\n"); + goto err_ctl_sock_init; + } + + 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; + + status = 0; +out: + return status; +err_v6_add_protocol: + sctp_v4_del_protocol(); +err_add_protocol: + inet_ctl_sock_destroy(sctp_ctl_sock); +err_ctl_sock_init: + sctp_v6_protosw_exit(); +err_v6_protosw_init: + sctp_v4_protosw_exit(); +err_protosw_init: + sctp_free_local_addr_list(); + 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: + kfree(sctp_ep_hashtable); +err_ehash_alloc: + free_pages((unsigned long)sctp_assoc_hashtable, + get_order(sctp_assoc_hashsize * + sizeof(struct sctp_hashbucket))); +err_ahash_alloc: + sctp_dbg_objcnt_exit(); + sctp_proc_exit(); +err_init_proc: + cleanup_sctp_mibs(); +err_init_mibs: + kmem_cache_destroy(sctp_chunk_cachep); +err_chunk_cachep: + kmem_cache_destroy(sctp_bucket_cachep); + goto out; +} + +/* Exit handler for the SCTP protocol. */ +SCTP_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(); + + /* Free the control endpoint. */ + inet_ctl_sock_destroy(sctp_ctl_sock); + + /* Free protosw registrations */ + sctp_v6_protosw_exit(); + sctp_v4_protosw_exit(); + + /* Free the local address list. */ + sctp_free_local_addr_list(); + + /* Unregister with socket layer. */ + sctp_v6_pf_exit(); + sctp_v4_pf_exit(); + + sctp_sysctl_unregister(); + + free_pages((unsigned long)sctp_assoc_hashtable, + get_order(sctp_assoc_hashsize * + sizeof(struct sctp_hashbucket))); + kfree(sctp_ep_hashtable); + free_pages((unsigned long)sctp_port_hashtable, + get_order(sctp_port_hashsize * + sizeof(struct sctp_bind_hashbucket))); + + sctp_dbg_objcnt_exit(); + sctp_proc_exit(); + cleanup_sctp_mibs(); + + 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 <lksctp-developers@lists.sourceforge.net>"); +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"); |