/* 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, 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>
* 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>
*
* Any bugs reported given to us we will try to fix... any fixes shared will
* be incorporated into the next SCTP release.
*/
#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 defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
#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>
/* Set SCTP_DEBUG flag via config if not already set. */
#ifndef SCTP_DEBUG
#ifdef CONFIG_SCTP_DBG_MSG
#define SCTP_DEBUG 1
#else
#define SCTP_DEBUG 0
#endif /* CONFIG_SCTP_DBG */
#endif /* SCTP_DEBUG */
#ifdef CONFIG_IP_SCTP_MODULE
#define SCTP_PROTOSW_FLAG 0
#else /* static! */
#define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
#endif
/* Certain internal static functions need to be exported when
* compiled into the test frame.
*/
#ifndef SCTP_STATIC
#define SCTP_STATIC static
#endif
/*
* Function declarations.
*/
/*
* sctp/protocol.c
*/
extern struct sock *sctp_get_ctl_sock(void);
extern int sctp_copy_local_addr_list(struct sctp_bind_addr *,
sctp_scope_t, gfp_t gfp,
int flags);
extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
/*
* 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;
/*
* sctp/primitive.c
*/
int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg);
int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg);
int sctp_primitive_ABORT(struct sctp_association *, void *arg);
int sctp_primitive_SEND(struct sctp_association *, void *arg);
int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg);
int sctp_primitive_ASCONF(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(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_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(void);
void sctp_snmp_proc_exit(void);
int sctp_eps_proc_init(void);
void sctp_eps_proc_exit(void);
int sctp_assocs_proc_init(void);
void sctp_assocs_proc_exit(void);
int sctp_remaddr_proc_init(void);
void sctp_remaddr_proc_exit(void);
/*
* 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
*/
#ifdef TEST_FRAME
#include <test_frame.h>
#else
/* spin lock wrappers. */
#define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
#define sctp_spin_unlock_irqrestore(lock, flags) \
spin_unlock_irqrestore(lock, flags)
#define sctp_local_bh_disable() local_bh_disable()
#define sctp_local_bh_enable() local_bh_enable()
#define sctp_spin_lock(lock) spin_lock(lock)
#define sctp_spin_unlock(lock) spin_unlock(lock)
#define sctp_write_lock(lock) write_lock(lock)
#define sctp_write_unlock(lock) write_unlock(lock)
#define sctp_read_lock(lock) read_lock(lock)
#define sctp_read_unlock(lock) read_unlock(lock)
/* sock lock wrappers. */
#define sctp_lock_sock(sk) lock_sock(sk)
#define sctp_release_sock(sk) release_sock(sk)
#define sctp_bh_lock_sock(sk) bh_lock_sock(sk)
#define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk)
/* SCTP SNMP MIB stats handlers */
DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics);
#define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field)
#define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field)
#define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field)
#define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field)
#endif /* !TEST_FRAME */
/* 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];
};
/* Print debugging messages. */
#if SCTP_DEBUG
extern int sctp_debug_flag;
#define SCTP_DEBUG_PRINTK(fmt, args...) \
do { \
if (sctp_debug_flag) \
printk(KERN_DEBUG pr_fmt(fmt), ##args); \
} while (0)
#define SCTP_DEBUG_PRINTK_CONT(fmt, args...) \
do { \
if (sctp_debug_flag) \
pr_cont(fmt, ##args); \
} while (0)
#define SCTP_DEBUG_PRINTK_IPADDR(fmt_lead, fmt_trail, \
args_lead, saddr, args_trail...) \
do { \
if (sctp_debug_flag) { \
if (saddr->sa.sa_family == AF_INET6) { \
printk(KERN_DEBUG \
pr_fmt(fmt_lead "%pI6" fmt_trail), \
args_lead, \
&saddr->v6.sin6_addr, \
args_trail); \
} else { \
printk(KERN_DEBUG \
pr_fmt(fmt_lead "%pI4" fmt_trail), \
args_lead, \
&saddr->v4.sin_addr.s_addr, \
args_trail); \
} \
} \
} while (0)
#define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
#define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
#define SCTP_ASSERT(expr, str, func) \
if (!(expr)) { \
SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
str, (#expr), __FILE__, __func__, __LINE__); \
func; \
}
#else /* SCTP_DEBUG */
#define SCTP_DEBUG_PRINTK(whatever...)
#define SCTP_DEBUG_PRINTK_CONT(fmt, args...)
#define SCTP_DEBUG_PRINTK_IPADDR(whatever...)
#define SCTP_ENABLE_DEBUG
#define SCTP_DISABLE_DEBUG
#define SCTP_ASSERT(expr, str, func)
#endif /* SCTP_DEBUG */
/*
* 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(void);
void sctp_dbg_objcnt_exit(void);
#else
#define SCTP_DBG_OBJCNT_INC(name)
#define SCTP_DBG_OBJCNT_DEC(name)
static inline void sctp_dbg_objcnt_init(void) { return; }
static inline void sctp_dbg_objcnt_exit(void) { return; }
#endif /* CONFIG_SCTP_DBG_OBJCOUNT */
#if defined CONFIG_SYSCTL
void sctp_sysctl_register(void);
void sctp_sysctl_unregister(void);
#else
static inline void sctp_sysctl_register(void) { return; }
static inline void sctp_sysctl_unregister(void) { return; }
#endif
/* Size of Supported Address Parameter for 'x' address types. */
#define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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);
/* 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;
sctp_spin_lock_irqsave(&head->lock, flags);
sctp_spin_lock(&list->lock);
skb_queue_splice_tail_init(list, head);
sctp_spin_unlock(&list->lock);
sctp_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 sctp_association *asoc)
{
sctp_assoc_sync_pmtu(asoc);
asoc->pmtu_pending = 0;
}
/* 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)
/* Make a new instance of type. */
#define t_new(type, flags) (type *)kzalloc(sizeof(type), flags)
/* Compare two timevals. */
#define tv_lt(s, t) \
(s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec))
/* Add tv1 to tv2. */
#define TIMEVAL_ADD(tv1, tv2) \
({ \
suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \
time_t secs = (tv2).tv_sec + (tv1).tv_sec; \
\
if (usecs >= 1000000) { \
usecs -= 1000000; \
secs++; \
} \
(tv2).tv_sec = secs; \
(tv2).tv_usec = usecs; \
})
/* External references. */
extern struct proto sctp_prot;
extern struct proto sctpv6_prot;
extern struct proc_dir_entry *proc_net_sctp;
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;
};
}
/* Perform some sanity checks. */
static inline int sctp_sanity_check(void)
{
SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
sizeof(((struct sk_buff *)0)->cb),
"SCTP: ulpevent does not fit in skb!\n", return 0);
return 1;
}
/* 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(__u16 lport)
{
return lport & (sctp_port_hashsize - 1);
}
/* This is the hash function for the endpoint hash table. */
static inline int sctp_ep_hashfn(__u16 lport)
{
return lport & (sctp_ep_hashsize - 1);
}
/* This is the hash function for the association hash table. */
static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport)
{
int h = (lport << 16) + rport;
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, node, head) \
hlist_for_each_entry(epb, node, 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, 0)) {
dst_release(t->dst);
t->dst = NULL;
}
return t->dst;
}
#endif /* __net_sctp_h__ */