| /* SCTP kernel implementation |
| * (C) Copyright IBM Corp. 2001, 2004 |
| * Copyright (c) 1999-2000 Cisco, Inc. |
| * Copyright (c) 1999-2001 Motorola, Inc. |
| * Copyright (c) 2001-2003 Intel Corp. |
| * |
| * This file is part of the SCTP kernel implementation |
| * |
| * The base lksctp header. |
| * |
| * This SCTP implementation is free software; |
| * you can redistribute it and/or modify it under the terms of |
| * the GNU General Public License as published by |
| * the Free Software Foundation; either version 2, or (at your option) |
| * any later version. |
| * |
| * This SCTP implementation is distributed in the hope that it |
| * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| * ************************ |
| * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| * See the GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with GNU CC; see the file COPYING. If not, see |
| * <http://www.gnu.org/licenses/>. |
| * |
| * Please send any bug reports or fixes you make to the |
| * email address(es): |
| * lksctp developers <linux-sctp@vger.kernel.org> |
| * |
| * Written or modified by: |
| * La Monte H.P. Yarroll <piggy@acm.org> |
| * Xingang Guo <xingang.guo@intel.com> |
| * Jon Grimm <jgrimm@us.ibm.com> |
| * Daisy Chang <daisyc@us.ibm.com> |
| * Sridhar Samudrala <sri@us.ibm.com> |
| * Ardelle Fan <ardelle.fan@intel.com> |
| * Ryan Layer <rmlayer@us.ibm.com> |
| * Kevin Gao <kevin.gao@intel.com> |
| */ |
| |
| #ifndef __net_sctp_h__ |
| #define __net_sctp_h__ |
| |
| /* Header Strategy. |
| * Start getting some control over the header file depencies: |
| * includes |
| * constants |
| * structs |
| * prototypes |
| * macros, externs, and inlines |
| * |
| * Move test_frame specific items out of the kernel headers |
| * and into the test frame headers. This is not perfect in any sense |
| * and will continue to evolve. |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/slab.h> |
| #include <linux/in.h> |
| #include <linux/tty.h> |
| #include <linux/proc_fs.h> |
| #include <linux/spinlock.h> |
| #include <linux/jiffies.h> |
| #include <linux/idr.h> |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| #include <net/ipv6.h> |
| #include <net/ip6_route.h> |
| #endif |
| |
| #include <asm/uaccess.h> |
| #include <asm/page.h> |
| #include <net/sock.h> |
| #include <net/snmp.h> |
| #include <net/sctp/structs.h> |
| #include <net/sctp/constants.h> |
| |
| #ifdef CONFIG_IP_SCTP_MODULE |
| #define SCTP_PROTOSW_FLAG 0 |
| #else /* static! */ |
| #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT |
| #endif |
| |
| /* |
| * Function declarations. |
| */ |
| |
| /* |
| * sctp/protocol.c |
| */ |
| int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *, |
| sctp_scope_t, gfp_t gfp, int flags); |
| struct sctp_pf *sctp_get_pf_specific(sa_family_t family); |
| int sctp_register_pf(struct sctp_pf *, sa_family_t); |
| void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); |
| |
| /* |
| * sctp/socket.c |
| */ |
| int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
| int sctp_inet_listen(struct socket *sock, int backlog); |
| void sctp_write_space(struct sock *sk); |
| void sctp_data_ready(struct sock *sk, int len); |
| unsigned int sctp_poll(struct file *file, struct socket *sock, |
| poll_table *wait); |
| void sctp_sock_rfree(struct sk_buff *skb); |
| void sctp_copy_sock(struct sock *newsk, struct sock *sk, |
| struct sctp_association *asoc); |
| extern struct percpu_counter sctp_sockets_allocated; |
| int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); |
| |
| /* |
| * sctp/primitive.c |
| */ |
| int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg); |
| int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg); |
| int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg); |
| int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg); |
| int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg); |
| int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg); |
| |
| /* |
| * sctp/input.c |
| */ |
| int sctp_rcv(struct sk_buff *skb); |
| void sctp_v4_err(struct sk_buff *skb, u32 info); |
| void sctp_hash_established(struct sctp_association *); |
| void sctp_unhash_established(struct sctp_association *); |
| void sctp_hash_endpoint(struct sctp_endpoint *); |
| void sctp_unhash_endpoint(struct sctp_endpoint *); |
| struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *, |
| struct sctphdr *, struct sctp_association **, |
| struct sctp_transport **); |
| void sctp_err_finish(struct sock *, struct sctp_association *); |
| void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, |
| struct sctp_transport *t, __u32 pmtu); |
| void sctp_icmp_redirect(struct sock *, struct sctp_transport *, |
| struct sk_buff *); |
| void sctp_icmp_proto_unreachable(struct sock *sk, |
| struct sctp_association *asoc, |
| struct sctp_transport *t); |
| void sctp_backlog_migrate(struct sctp_association *assoc, |
| struct sock *oldsk, struct sock *newsk); |
| |
| /* |
| * sctp/proc.c |
| */ |
| int sctp_snmp_proc_init(struct net *net); |
| void sctp_snmp_proc_exit(struct net *net); |
| int sctp_eps_proc_init(struct net *net); |
| void sctp_eps_proc_exit(struct net *net); |
| int sctp_assocs_proc_init(struct net *net); |
| void sctp_assocs_proc_exit(struct net *net); |
| int sctp_remaddr_proc_init(struct net *net); |
| void sctp_remaddr_proc_exit(struct net *net); |
| |
| |
| /* |
| * Module global variables |
| */ |
| |
| /* |
| * sctp/protocol.c |
| */ |
| extern struct kmem_cache *sctp_chunk_cachep __read_mostly; |
| extern struct kmem_cache *sctp_bucket_cachep __read_mostly; |
| |
| /* |
| * Section: Macros, externs, and inlines |
| */ |
| |
| /* SCTP SNMP MIB stats handlers */ |
| #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field) |
| #define SCTP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field) |
| #define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field) |
| #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field) |
| |
| /* sctp mib definitions */ |
| enum { |
| SCTP_MIB_NUM = 0, |
| SCTP_MIB_CURRESTAB, /* CurrEstab */ |
| SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ |
| SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ |
| SCTP_MIB_ABORTEDS, /* Aborteds */ |
| SCTP_MIB_SHUTDOWNS, /* Shutdowns */ |
| SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ |
| SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ |
| SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ |
| SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ |
| SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ |
| SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ |
| SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ |
| SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ |
| SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ |
| SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ |
| SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ |
| SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ |
| SCTP_MIB_T1_INIT_EXPIREDS, |
| SCTP_MIB_T1_COOKIE_EXPIREDS, |
| SCTP_MIB_T2_SHUTDOWN_EXPIREDS, |
| SCTP_MIB_T3_RTX_EXPIREDS, |
| SCTP_MIB_T4_RTO_EXPIREDS, |
| SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, |
| SCTP_MIB_DELAY_SACK_EXPIREDS, |
| SCTP_MIB_AUTOCLOSE_EXPIREDS, |
| SCTP_MIB_T1_RETRANSMITS, |
| SCTP_MIB_T3_RETRANSMITS, |
| SCTP_MIB_PMTUD_RETRANSMITS, |
| SCTP_MIB_FAST_RETRANSMITS, |
| SCTP_MIB_IN_PKT_SOFTIRQ, |
| SCTP_MIB_IN_PKT_BACKLOG, |
| SCTP_MIB_IN_PKT_DISCARDS, |
| SCTP_MIB_IN_DATA_CHUNK_DISCARDS, |
| __SCTP_MIB_MAX |
| }; |
| |
| #define SCTP_MIB_MAX __SCTP_MIB_MAX |
| struct sctp_mib { |
| unsigned long mibs[SCTP_MIB_MAX]; |
| }; |
| |
| /* helper function to track stats about max rto and related transport */ |
| static inline void sctp_max_rto(struct sctp_association *asoc, |
| struct sctp_transport *trans) |
| { |
| if (asoc->stats.max_obs_rto < (__u64)trans->rto) { |
| asoc->stats.max_obs_rto = trans->rto; |
| memset(&asoc->stats.obs_rto_ipaddr, 0, |
| sizeof(struct sockaddr_storage)); |
| memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr, |
| trans->af_specific->sockaddr_len); |
| } |
| } |
| |
| /* |
| * Macros for keeping a global reference of object allocations. |
| */ |
| #ifdef CONFIG_SCTP_DBG_OBJCNT |
| |
| extern atomic_t sctp_dbg_objcnt_sock; |
| extern atomic_t sctp_dbg_objcnt_ep; |
| extern atomic_t sctp_dbg_objcnt_assoc; |
| extern atomic_t sctp_dbg_objcnt_transport; |
| extern atomic_t sctp_dbg_objcnt_chunk; |
| extern atomic_t sctp_dbg_objcnt_bind_addr; |
| extern atomic_t sctp_dbg_objcnt_bind_bucket; |
| extern atomic_t sctp_dbg_objcnt_addr; |
| extern atomic_t sctp_dbg_objcnt_ssnmap; |
| extern atomic_t sctp_dbg_objcnt_datamsg; |
| extern atomic_t sctp_dbg_objcnt_keys; |
| |
| /* Macros to atomically increment/decrement objcnt counters. */ |
| #define SCTP_DBG_OBJCNT_INC(name) \ |
| atomic_inc(&sctp_dbg_objcnt_## name) |
| #define SCTP_DBG_OBJCNT_DEC(name) \ |
| atomic_dec(&sctp_dbg_objcnt_## name) |
| #define SCTP_DBG_OBJCNT(name) \ |
| atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) |
| |
| /* Macro to help create new entries in in the global array of |
| * objcnt counters. |
| */ |
| #define SCTP_DBG_OBJCNT_ENTRY(name) \ |
| {.label= #name, .counter= &sctp_dbg_objcnt_## name} |
| |
| void sctp_dbg_objcnt_init(struct net *); |
| void sctp_dbg_objcnt_exit(struct net *); |
| |
| #else |
| |
| #define SCTP_DBG_OBJCNT_INC(name) |
| #define SCTP_DBG_OBJCNT_DEC(name) |
| |
| static inline void sctp_dbg_objcnt_init(struct net *net) { return; } |
| static inline void sctp_dbg_objcnt_exit(struct net *net) { return; } |
| |
| #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ |
| |
| #if defined CONFIG_SYSCTL |
| void sctp_sysctl_register(void); |
| void sctp_sysctl_unregister(void); |
| int sctp_sysctl_net_register(struct net *net); |
| void sctp_sysctl_net_unregister(struct net *net); |
| #else |
| static inline void sctp_sysctl_register(void) { return; } |
| static inline void sctp_sysctl_unregister(void) { return; } |
| static inline int sctp_sysctl_net_register(struct net *net) { return 0; } |
| static inline void sctp_sysctl_net_unregister(struct net *net) { return; } |
| #endif |
| |
| /* Size of Supported Address Parameter for 'x' address types. */ |
| #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| |
| void sctp_v6_pf_init(void); |
| void sctp_v6_pf_exit(void); |
| int sctp_v6_protosw_init(void); |
| void sctp_v6_protosw_exit(void); |
| int sctp_v6_add_protocol(void); |
| void sctp_v6_del_protocol(void); |
| |
| #else /* #ifdef defined(CONFIG_IPV6) */ |
| |
| static inline void sctp_v6_pf_init(void) { return; } |
| static inline void sctp_v6_pf_exit(void) { return; } |
| static inline int sctp_v6_protosw_init(void) { return 0; } |
| static inline void sctp_v6_protosw_exit(void) { return; } |
| static inline int sctp_v6_add_protocol(void) { return 0; } |
| static inline void sctp_v6_del_protocol(void) { return; } |
| |
| #endif /* #if defined(CONFIG_IPV6) */ |
| |
| |
| /* Map an association to an assoc_id. */ |
| static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) |
| { |
| return asoc ? asoc->assoc_id : 0; |
| } |
| |
| /* Look up the association by its id. */ |
| struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); |
| |
| int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); |
| |
| /* A macro to walk a list of skbs. */ |
| #define sctp_skb_for_each(pos, head, tmp) \ |
| skb_queue_walk_safe(head, pos, tmp) |
| |
| /* A helper to append an entire skb list (list) to another (head). */ |
| static inline void sctp_skb_list_tail(struct sk_buff_head *list, |
| struct sk_buff_head *head) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&head->lock, flags); |
| spin_lock(&list->lock); |
| |
| skb_queue_splice_tail_init(list, head); |
| |
| spin_unlock(&list->lock); |
| spin_unlock_irqrestore(&head->lock, flags); |
| } |
| |
| /** |
| * sctp_list_dequeue - remove from the head of the queue |
| * @list: list to dequeue from |
| * |
| * Remove the head of the list. The head item is |
| * returned or %NULL if the list is empty. |
| */ |
| |
| static inline struct list_head *sctp_list_dequeue(struct list_head *list) |
| { |
| struct list_head *result = NULL; |
| |
| if (list->next != list) { |
| result = list->next; |
| list->next = result->next; |
| list->next->prev = list; |
| INIT_LIST_HEAD(result); |
| } |
| return result; |
| } |
| |
| /* SCTP version of skb_set_owner_r. We need this one because |
| * of the way we have to do receive buffer accounting on bundled |
| * chunks. |
| */ |
| static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) |
| { |
| struct sctp_ulpevent *event = sctp_skb2event(skb); |
| |
| skb_orphan(skb); |
| skb->sk = sk; |
| skb->destructor = sctp_sock_rfree; |
| atomic_add(event->rmem_len, &sk->sk_rmem_alloc); |
| /* |
| * This mimics the behavior of skb_set_owner_r |
| */ |
| sk->sk_forward_alloc -= event->rmem_len; |
| } |
| |
| /* Tests if the list has one and only one entry. */ |
| static inline int sctp_list_single_entry(struct list_head *head) |
| { |
| return (head->next != head) && (head->next == head->prev); |
| } |
| |
| /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ |
| static inline __s32 sctp_jitter(__u32 rto) |
| { |
| static __u32 sctp_rand; |
| __s32 ret; |
| |
| /* Avoid divide by zero. */ |
| if (!rto) |
| rto = 1; |
| |
| sctp_rand += jiffies; |
| sctp_rand ^= (sctp_rand << 12); |
| sctp_rand ^= (sctp_rand >> 20); |
| |
| /* Choose random number from 0 to rto, then move to -50% ~ +50% |
| * of rto. |
| */ |
| ret = sctp_rand % rto - (rto >> 1); |
| return ret; |
| } |
| |
| /* Break down data chunks at this point. */ |
| static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu) |
| { |
| struct sctp_sock *sp = sctp_sk(asoc->base.sk); |
| int frag = pmtu; |
| |
| frag -= sp->pf->af->net_header_len; |
| frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); |
| |
| if (asoc->user_frag) |
| frag = min_t(int, frag, asoc->user_frag); |
| |
| frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); |
| |
| return frag; |
| } |
| |
| static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc) |
| { |
| |
| sctp_assoc_sync_pmtu(sk, asoc); |
| asoc->pmtu_pending = 0; |
| } |
| |
| static inline bool sctp_chunk_pending(const struct sctp_chunk *chunk) |
| { |
| return !list_empty(&chunk->list); |
| } |
| |
| /* Walk through a list of TLV parameters. Don't trust the |
| * individual parameter lengths and instead depend on |
| * the chunk length to indicate when to stop. Make sure |
| * there is room for a param header too. |
| */ |
| #define sctp_walk_params(pos, chunk, member)\ |
| _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member) |
| |
| #define _sctp_walk_params(pos, chunk, end, member)\ |
| for (pos.v = chunk->member;\ |
| pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ |
| ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ |
| pos.v += WORD_ROUND(ntohs(pos.p->length))) |
| |
| #define sctp_walk_errors(err, chunk_hdr)\ |
| _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) |
| |
| #define _sctp_walk_errors(err, chunk_hdr, end)\ |
| for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ |
| sizeof(sctp_chunkhdr_t));\ |
| (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ |
| ntohs(err->length) >= sizeof(sctp_errhdr_t); \ |
| err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) |
| |
| #define sctp_walk_fwdtsn(pos, chunk)\ |
| _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) |
| |
| #define _sctp_walk_fwdtsn(pos, chunk, end)\ |
| for (pos = chunk->subh.fwdtsn_hdr->skip;\ |
| (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ |
| pos++) |
| |
| /* Round an int up to the next multiple of 4. */ |
| #define WORD_ROUND(s) (((s)+3)&~3) |
| |
| /* External references. */ |
| |
| extern struct proto sctp_prot; |
| extern struct proto sctpv6_prot; |
| void sctp_put_port(struct sock *sk); |
| |
| extern struct idr sctp_assocs_id; |
| extern spinlock_t sctp_assocs_id_lock; |
| |
| /* Static inline functions. */ |
| |
| /* Convert from an IP version number to an Address Family symbol. */ |
| static inline int ipver2af(__u8 ipver) |
| { |
| switch (ipver) { |
| case 4: |
| return AF_INET; |
| case 6: |
| return AF_INET6; |
| default: |
| return 0; |
| } |
| } |
| |
| /* Convert from an address parameter type to an address family. */ |
| static inline int param_type2af(__be16 type) |
| { |
| switch (type) { |
| case SCTP_PARAM_IPV4_ADDRESS: |
| return AF_INET; |
| case SCTP_PARAM_IPV6_ADDRESS: |
| return AF_INET6; |
| default: |
| return 0; |
| } |
| } |
| |
| /* Warning: The following hash functions assume a power of two 'size'. */ |
| /* This is the hash function for the SCTP port hash table. */ |
| static inline int sctp_phashfn(struct net *net, __u16 lport) |
| { |
| return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1); |
| } |
| |
| /* This is the hash function for the endpoint hash table. */ |
| static inline int sctp_ep_hashfn(struct net *net, __u16 lport) |
| { |
| return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1); |
| } |
| |
| /* This is the hash function for the association hash table. */ |
| static inline int sctp_assoc_hashfn(struct net *net, __u16 lport, __u16 rport) |
| { |
| int h = (lport << 16) + rport + net_hash_mix(net); |
| h ^= h>>8; |
| return h & (sctp_assoc_hashsize - 1); |
| } |
| |
| /* This is the hash function for the association hash table. This is |
| * not used yet, but could be used as a better hash function when |
| * we have a vtag. |
| */ |
| static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) |
| { |
| int h = (lport << 16) + rport; |
| h ^= vtag; |
| return h & (sctp_assoc_hashsize - 1); |
| } |
| |
| #define sctp_for_each_hentry(epb, head) \ |
| hlist_for_each_entry(epb, head, node) |
| |
| /* Is a socket of this style? */ |
| #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) |
| static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) |
| { |
| return sctp_sk(sk)->type == style; |
| } |
| |
| /* Is the association in this state? */ |
| #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) |
| static inline int __sctp_state(const struct sctp_association *asoc, |
| sctp_state_t state) |
| { |
| return asoc->state == state; |
| } |
| |
| /* Is the socket in this state? */ |
| #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) |
| static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) |
| { |
| return sk->sk_state == state; |
| } |
| |
| /* Map v4-mapped v6 address back to v4 address */ |
| static inline void sctp_v6_map_v4(union sctp_addr *addr) |
| { |
| addr->v4.sin_family = AF_INET; |
| addr->v4.sin_port = addr->v6.sin6_port; |
| addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; |
| } |
| |
| /* Map v4 address to v4-mapped v6 address */ |
| static inline void sctp_v4_map_v6(union sctp_addr *addr) |
| { |
| addr->v6.sin6_family = AF_INET6; |
| addr->v6.sin6_port = addr->v4.sin_port; |
| addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; |
| addr->v6.sin6_addr.s6_addr32[0] = 0; |
| addr->v6.sin6_addr.s6_addr32[1] = 0; |
| addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); |
| } |
| |
| /* The cookie is always 0 since this is how it's used in the |
| * pmtu code. |
| */ |
| static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) |
| { |
| if (t->dst && !dst_check(t->dst, t->dst_cookie)) { |
| dst_release(t->dst); |
| t->dst = NULL; |
| } |
| |
| return t->dst; |
| } |
| |
| #endif /* __net_sctp_h__ */ |