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/*-
 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * a) Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * b) Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the distribution.
 *
 * c) Neither the name of Cisco Systems, Inc. nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/netinet/sctp_pcb.h 237896 2012-07-01 07:59:00Z tuexen $");

#ifndef _NETINET_SCTP_PCB_H_
#define _NETINET_SCTP_PCB_H_

#include <netinet/sctp_os.h>
#include <netinet/sctp.h>
#include <netinet/sctp_constants.h>
#include <netinet/sctp_sysctl.h>

LIST_HEAD(sctppcbhead, sctp_inpcb);
LIST_HEAD(sctpasochead, sctp_tcb);
LIST_HEAD(sctpladdr, sctp_laddr);
LIST_HEAD(sctpvtaghead, sctp_tagblock);
LIST_HEAD(sctp_vrflist, sctp_vrf);
LIST_HEAD(sctp_ifnlist, sctp_ifn);
LIST_HEAD(sctp_ifalist, sctp_ifa);
TAILQ_HEAD(sctp_readhead, sctp_queued_to_read);
TAILQ_HEAD(sctp_streamhead, sctp_stream_queue_pending);

#include <netinet/sctp_structs.h>
#include <netinet/sctp_auth.h>

#define SCTP_PCBHASH_ALLADDR(port, mask) (port & mask)
#define SCTP_PCBHASH_ASOC(tag, mask) (tag & mask)

struct sctp_vrf {
	LIST_ENTRY(sctp_vrf) next_vrf;
	struct sctp_ifalist *vrf_addr_hash;
	struct sctp_ifnlist ifnlist;
	uint32_t vrf_id;
	uint32_t tbl_id_v4;	/* default v4 table id */
	uint32_t tbl_id_v6;	/* default v6 table id */
	uint32_t total_ifa_count;
	u_long vrf_addr_hashmark;
	uint32_t refcount;
};

struct sctp_ifn {
	struct sctp_ifalist ifalist;
	struct sctp_vrf *vrf;
	         LIST_ENTRY(sctp_ifn) next_ifn;
	         LIST_ENTRY(sctp_ifn) next_bucket;
	void *ifn_p;		/* never access without appropriate lock */
	uint32_t ifn_mtu;
	uint32_t ifn_type;
	uint32_t ifn_index;	/* shorthand way to look at ifn for reference */
	uint32_t refcount;	/* number of reference held should be >=
				 * ifa_count */
	uint32_t ifa_count;	/* IFA's we hold (in our list - ifalist) */
	uint32_t num_v6;	/* number of v6 addresses */
	uint32_t num_v4;	/* number of v4 addresses */
	uint32_t registered_af;	/* registered address family for i/f events */
	char ifn_name[SCTP_IFNAMSIZ];
};

/* SCTP local IFA flags */
#define SCTP_ADDR_VALID         0x00000001	/* its up and active */
#define SCTP_BEING_DELETED      0x00000002	/* being deleted, when
						 * refcount = 0. Note that it
						 * is pulled from the ifn list
						 * and ifa_p is nulled right
						 * away but it cannot be freed
						 * until the last *net
						 * pointing to it is deleted. */
#define SCTP_ADDR_DEFER_USE     0x00000004	/* Hold off using this one */
#define SCTP_ADDR_IFA_UNUSEABLE 0x00000008

struct sctp_ifa {
	LIST_ENTRY(sctp_ifa) next_ifa;
	LIST_ENTRY(sctp_ifa) next_bucket;
	struct sctp_ifn *ifn_p;	/* back pointer to parent ifn */
	void *ifa;		/* pointer to ifa, needed for flag update for
				 * that we MUST lock appropriate locks. This
				 * is for V6. */
	union sctp_sockstore address;
	uint32_t refcount;	/* number of folks refering to this */
	uint32_t flags;
	uint32_t localifa_flags;
	uint32_t vrf_id;	/* vrf_id of this addr (for deleting) */
	uint8_t src_is_loop;
	uint8_t src_is_priv;
	uint8_t src_is_glob;
	uint8_t resv;
};

struct sctp_laddr {
	LIST_ENTRY(sctp_laddr) sctp_nxt_addr;	/* next in list */
	struct sctp_ifa *ifa;
	uint32_t action;	/* Used during asconf and adding if no-zero
				 * src-addr selection will not consider this
				 * address. */
	struct timeval start_time;	/* time when this address was created */
};

struct sctp_block_entry {
	int error;
};

struct sctp_timewait {
	uint32_t tv_sec_at_expire;	/* the seconds from boot to expire */
	uint32_t v_tag;		/* the vtag that can not be reused */
	uint16_t lport;		/* the local port used in vtag */
	uint16_t rport;		/* the remote port used in vtag */
};

struct sctp_tagblock {
	LIST_ENTRY(sctp_tagblock) sctp_nxt_tagblock;
	struct sctp_timewait vtag_block[SCTP_NUMBER_IN_VTAG_BLOCK];
};


struct sctp_epinfo {
	struct socket *udp_tun_socket;
	struct sctpasochead *sctp_asochash;
	u_long hashasocmark;

	struct sctppcbhead *sctp_ephash;
	u_long hashmark;

	/*-
	 * The TCP model represents a substantial overhead in that we get an
	 * additional hash table to keep explicit connections in. The
	 * listening TCP endpoint will exist in the usual ephash above and
	 * accept only INIT's. It will be incapable of sending off an INIT.
	 * When a dg arrives we must look in the normal ephash. If we find a
	 * TCP endpoint that will tell us to go to the specific endpoint
	 * hash and re-hash to find the right assoc/socket. If we find a UDP
	 * model socket we then must complete the lookup. If this fails,
	 * i.e. no association can be found then we must continue to see if
	 * a sctp_peeloff()'d socket is in the tcpephash (a spun off socket
	 * acts like a TCP model connected socket).
	 */
	struct sctppcbhead *sctp_tcpephash;
	u_long hashtcpmark;
	uint32_t hashtblsize;

	struct sctp_vrflist *sctp_vrfhash;
	u_long hashvrfmark;

	struct sctp_ifnlist *vrf_ifn_hash;
	u_long vrf_ifn_hashmark;

	struct sctppcbhead listhead;
	struct sctpladdr addr_wq;

	/* ep zone info */
	sctp_zone_t ipi_zone_ep;
	sctp_zone_t ipi_zone_asoc;
	sctp_zone_t ipi_zone_laddr;
	sctp_zone_t ipi_zone_net;
	sctp_zone_t ipi_zone_chunk;
	sctp_zone_t ipi_zone_readq;
	sctp_zone_t ipi_zone_strmoq;
	sctp_zone_t ipi_zone_asconf;
	sctp_zone_t ipi_zone_asconf_ack;

	struct rwlock ipi_ep_mtx;
	struct mtx ipi_iterator_wq_mtx;
	struct rwlock ipi_addr_mtx;
	struct mtx ipi_pktlog_mtx;
	struct mtx wq_addr_mtx;
	uint32_t ipi_count_ep;

	/* assoc/tcb zone info */
	uint32_t ipi_count_asoc;

	/* local addrlist zone info */
	uint32_t ipi_count_laddr;

	/* remote addrlist zone info */
	uint32_t ipi_count_raddr;

	/* chunk structure list for output */
	uint32_t ipi_count_chunk;

	/* socket queue zone info */
	uint32_t ipi_count_readq;

	/* socket queue zone info */
	uint32_t ipi_count_strmoq;

	/* Number of vrfs */
	uint32_t ipi_count_vrfs;

	/* Number of ifns */
	uint32_t ipi_count_ifns;

	/* Number of ifas */
	uint32_t ipi_count_ifas;

	/* system wide number of free chunks hanging around */
	uint32_t ipi_free_chunks;
	uint32_t ipi_free_strmoq;

	struct sctpvtaghead vtag_timewait[SCTP_STACK_VTAG_HASH_SIZE];

	/* address work queue handling */
	struct sctp_timer addr_wq_timer;

};


struct sctp_base_info {
	/*
	 * All static structures that anchor the system must be here.
	 */
	struct sctp_epinfo sctppcbinfo;
#if defined(__FreeBSD__) && defined(SMP) && defined(SCTP_USE_PERCPU_STAT)
	struct sctpstat *sctpstat;
#else
	struct sctpstat sctpstat;
#endif
	struct sctp_sysctl sctpsysctl;
	uint8_t first_time;
	char sctp_pcb_initialized;
#if defined(SCTP_PACKET_LOGGING)
	int packet_log_writers;
	int packet_log_end;
	uint8_t packet_log_buffer[SCTP_PACKET_LOG_SIZE];
#endif
};

/*-
 * Here we have all the relevant information for each SCTP entity created. We
 * will need to modify this as approprate. We also need to figure out how to
 * access /dev/random.
 */
struct sctp_pcb {
	unsigned int time_of_secret_change;	/* number of seconds from
						 * timeval.tv_sec */
	uint32_t secret_key[SCTP_HOW_MANY_SECRETS][SCTP_NUMBER_OF_SECRETS];
	unsigned int size_of_a_cookie;

	unsigned int sctp_timeoutticks[SCTP_NUM_TMRS];
	unsigned int sctp_minrto;
	unsigned int sctp_maxrto;
	unsigned int initial_rto;
	int initial_init_rto_max;

	unsigned int sctp_sack_freq;
	uint32_t sctp_sws_sender;
	uint32_t sctp_sws_receiver;

	uint32_t sctp_default_cc_module;
	uint32_t sctp_default_ss_module;
	/* authentication related fields */
	struct sctp_keyhead shared_keys;
	sctp_auth_chklist_t *local_auth_chunks;
	sctp_hmaclist_t *local_hmacs;
	uint16_t default_keyid;

	/* various thresholds */
	/* Max times I will init at a guy */
	uint16_t max_init_times;

	/* Max times I will send before we consider someone dead */
	uint16_t max_send_times;

	uint16_t def_net_failure;

	uint16_t def_net_pf_threshold;

	/* number of streams to pre-open on a association */
	uint16_t pre_open_stream_count;
	uint16_t max_open_streams_intome;

	/* random number generator */
	uint32_t random_counter;
	uint8_t random_numbers[SCTP_SIGNATURE_ALOC_SIZE];
	uint8_t random_store[SCTP_SIGNATURE_ALOC_SIZE];

	/*
	 * This timer is kept running per endpoint.  When it fires it will
	 * change the secret key.  The default is once a hour
	 */
	struct sctp_timer signature_change;

	/* Zero copy full buffer timer */
	struct sctp_timer zero_copy_timer;
	/* Zero copy app to transport (sendq) read repulse timer */
	struct sctp_timer zero_copy_sendq_timer;
	uint32_t def_cookie_life;
	/* defaults to 0 */
	int auto_close_time;
	uint32_t initial_sequence_debug;
	uint32_t adaptation_layer_indicator;
	uint32_t store_at;
	uint32_t max_burst;
	uint32_t fr_max_burst;
#ifdef INET6
	uint32_t default_flowlabel;
#endif
	uint8_t default_dscp;
	char current_secret_number;
	char last_secret_number;
	uint16_t port;		/* remote UDP encapsulation port */
};

#ifndef SCTP_ALIGNMENT
#define SCTP_ALIGNMENT 32
#endif

#ifndef SCTP_ALIGNM1
#define SCTP_ALIGNM1 (SCTP_ALIGNMENT-1)
#endif

#define sctp_lport ip_inp.inp.inp_lport

struct sctp_pcbtsn_rlog {
	uint32_t vtag;
	uint16_t strm;
	uint16_t seq;
	uint16_t sz;
	uint16_t flgs;
};

#define SCTP_READ_LOG_SIZE 135	/* we choose the number to make a pcb a page */


struct sctp_inpcb {
	/*-
	 * put an inpcb in front of it all, kind of a waste but we need to
	 * for compatability with all the other stuff.
	 */
	union {
		struct inpcb inp;
		char align[(sizeof(struct in6pcb) + SCTP_ALIGNM1) &
		        ~SCTP_ALIGNM1];
	}     ip_inp;


	/* Socket buffer lock protects read_queue and of course sb_cc */
	struct sctp_readhead read_queue;

	              LIST_ENTRY(sctp_inpcb) sctp_list;	/* lists all endpoints */
	/* hash of all endpoints for model */
	              LIST_ENTRY(sctp_inpcb) sctp_hash;
	/* count of local addresses bound, 0 if bound all */
	int laddr_count;

	/* list of addrs in use by the EP, NULL if bound-all */
	struct sctpladdr sctp_addr_list;
	/*
	 * used for source address selection rotation when we are subset
	 * bound
	 */
	struct sctp_laddr *next_addr_touse;

	/* back pointer to our socket */
	struct socket *sctp_socket;
	uint32_t sctp_flags;	/* INP state flag set */
	uint32_t sctp_features;	/* Feature flags */
	uint32_t sctp_mobility_features;	/* Mobility  Feature flags */
	struct sctp_pcb sctp_ep;/* SCTP ep data */
	/* head of the hash of all associations */
	struct sctpasochead *sctp_tcbhash;
	u_long sctp_hashmark;
	/* head of the list of all associations */
	struct sctpasochead sctp_asoc_list;
#ifdef SCTP_TRACK_FREED_ASOCS
	struct sctpasochead sctp_asoc_free_list;
#endif
	struct sctp_iterator *inp_starting_point_for_iterator;
	uint32_t sctp_frag_point;
	uint32_t partial_delivery_point;
	uint32_t sctp_context;
	uint8_t local_strreset_support;
	uint32_t sctp_cmt_on_off;
	uint32_t sctp_ecn_enable;
	struct sctp_nonpad_sndrcvinfo def_send;
	/*-
	 * These three are here for the sosend_dgram
	 * (pkt, pkt_last and control).
	 * routine. However, I don't think anyone in
	 * the current FreeBSD kernel calls this. So
	 * they are candidates with sctp_sendm for
	 * de-supporting.
	 */
	struct mbuf *pkt, *pkt_last;
	struct mbuf *control;
	struct mtx inp_mtx;
	struct mtx inp_create_mtx;
	struct mtx inp_rdata_mtx;
	int32_t refcount;
	uint32_t def_vrf_id;
	uint32_t total_sends;
	uint32_t total_recvs;
	uint32_t last_abort_code;
	uint32_t total_nospaces;
	struct sctpasochead *sctp_asocidhash;
	u_long hashasocidmark;
	uint32_t sctp_associd_counter;

#ifdef SCTP_ASOCLOG_OF_TSNS
	struct sctp_pcbtsn_rlog readlog[SCTP_READ_LOG_SIZE];
	uint32_t readlog_index;
#endif
};

struct sctp_tcb {
	struct socket *sctp_socket;	/* back pointer to socket */
	struct sctp_inpcb *sctp_ep;	/* back pointer to ep */
	           LIST_ENTRY(sctp_tcb) sctp_tcbhash;	/* next link in hash
							 * table */
	           LIST_ENTRY(sctp_tcb) sctp_tcblist;	/* list of all of the
							 * TCB's */
	           LIST_ENTRY(sctp_tcb) sctp_tcbasocidhash;	/* next link in asocid
								 * hash table */
	           LIST_ENTRY(sctp_tcb) sctp_asocs;	/* vtag hash list */
	struct sctp_block_entry *block_entry;	/* pointer locked by  socket
						 * send buffer */
	struct sctp_association asoc;
	/*-
	 * freed_by_sorcv_sincelast is protected by the sockbuf_lock NOT the
	 * tcb_lock. Its special in this way to help avoid extra mutex calls
	 * in the reading of data.
	 */
	uint32_t freed_by_sorcv_sincelast;
	uint32_t total_sends;
	uint32_t total_recvs;
	int freed_from_where;
	uint16_t rport;		/* remote port in network format */
	uint16_t resv;
	struct mtx tcb_mtx;
	struct mtx tcb_send_mtx;
};



#include <netinet/sctp_lock_bsd.h>


/* TODO where to put non-_KERNEL things for __Userspace__? */
#if defined(_KERNEL) || defined(__Userspace__)

/* Attention Julian, this is the extern that
 * goes with the base info. sctp_pcb.c has
 * the real definition.
 */
VNET_DECLARE(struct sctp_base_info, system_base_info);

#ifdef INET6
int SCTP6_ARE_ADDR_EQUAL(struct sockaddr_in6 *a, struct sockaddr_in6 *b);

#endif

void sctp_fill_pcbinfo(struct sctp_pcbinfo *);

struct sctp_ifn *
         sctp_find_ifn(void *ifn, uint32_t ifn_index);

struct sctp_vrf *sctp_allocate_vrf(int vrfid);
struct sctp_vrf *sctp_find_vrf(uint32_t vrfid);
void sctp_free_vrf(struct sctp_vrf *vrf);

/*-
 * Change address state, can be used if
 * O/S supports telling transports about
 * changes to IFA/IFN's (link layer triggers).
 * If a ifn goes down, we will do src-addr-selection
 * and NOT use that, as a source address. This does
 * not stop the routing system from routing out
 * that interface, but we won't put it as a source.
 */
void sctp_mark_ifa_addr_down(uint32_t vrf_id, struct sockaddr *addr, const char *if_name, uint32_t ifn_index);
void sctp_mark_ifa_addr_up(uint32_t vrf_id, struct sockaddr *addr, const char *if_name, uint32_t ifn_index);

struct sctp_ifa *
sctp_add_addr_to_vrf(uint32_t vrfid,
    void *ifn, uint32_t ifn_index, uint32_t ifn_type,
    const char *if_name,
    void *ifa, struct sockaddr *addr, uint32_t ifa_flags,
    int dynamic_add);

void sctp_update_ifn_mtu(uint32_t ifn_index, uint32_t mtu);

void sctp_free_ifn(struct sctp_ifn *sctp_ifnp);
void sctp_free_ifa(struct sctp_ifa *sctp_ifap);


void 
sctp_del_addr_from_vrf(uint32_t vrfid, struct sockaddr *addr,
    uint32_t ifn_index, const char *if_name);



struct sctp_nets *sctp_findnet(struct sctp_tcb *, struct sockaddr *);

struct sctp_inpcb *sctp_pcb_findep(struct sockaddr *, int, int, uint32_t);

int 
sctp_inpcb_bind(struct socket *, struct sockaddr *,
    struct sctp_ifa *, struct thread *);

struct sctp_tcb *
sctp_findassociation_addr(struct mbuf *, int,
    struct sctphdr *, struct sctp_chunkhdr *, struct sctp_inpcb **,
    struct sctp_nets **, uint32_t vrf_id);

struct sctp_tcb *
sctp_findassociation_addr_sa(struct sockaddr *,
    struct sockaddr *, struct sctp_inpcb **, struct sctp_nets **, int, uint32_t);

void
sctp_move_pcb_and_assoc(struct sctp_inpcb *, struct sctp_inpcb *,
    struct sctp_tcb *);

/*-
 * For this call ep_addr, the to is the destination endpoint address of the
 * peer (relative to outbound). The from field is only used if the TCP model
 * is enabled and helps distingush amongst the subset bound (non-boundall).
 * The TCP model MAY change the actual ep field, this is why it is passed.
 */
struct sctp_tcb *
sctp_findassociation_ep_addr(struct sctp_inpcb **,
    struct sockaddr *, struct sctp_nets **, struct sockaddr *,
    struct sctp_tcb *);

struct sctp_tcb *
         sctp_findasoc_ep_asocid_locked(struct sctp_inpcb *inp, sctp_assoc_t asoc_id, int want_lock);

struct sctp_tcb *
sctp_findassociation_ep_asocid(struct sctp_inpcb *,
    sctp_assoc_t, int);

struct sctp_tcb *
sctp_findassociation_ep_asconf(struct mbuf *, int,
    struct sctphdr *, struct sctp_inpcb **, struct sctp_nets **, uint32_t vrf_id);

int sctp_inpcb_alloc(struct socket *so, uint32_t vrf_id);

int sctp_is_address_on_local_host(struct sockaddr *addr, uint32_t vrf_id);

void sctp_inpcb_free(struct sctp_inpcb *, int, int);

struct sctp_tcb *
sctp_aloc_assoc(struct sctp_inpcb *, struct sockaddr *,
    int *, uint32_t, uint32_t, struct thread *);

int sctp_free_assoc(struct sctp_inpcb *, struct sctp_tcb *, int, int);


void sctp_delete_from_timewait(uint32_t, uint16_t, uint16_t);

int sctp_is_in_timewait(uint32_t tag, uint16_t lport, uint16_t rport);

void
     sctp_add_vtag_to_timewait(uint32_t tag, uint32_t time, uint16_t lport, uint16_t rport);

void sctp_add_local_addr_ep(struct sctp_inpcb *, struct sctp_ifa *, uint32_t);

int sctp_insert_laddr(struct sctpladdr *, struct sctp_ifa *, uint32_t);

void sctp_remove_laddr(struct sctp_laddr *);

void sctp_del_local_addr_ep(struct sctp_inpcb *, struct sctp_ifa *);

int sctp_add_remote_addr(struct sctp_tcb *, struct sockaddr *, struct sctp_nets **, int, int);

void sctp_remove_net(struct sctp_tcb *, struct sctp_nets *);

int sctp_del_remote_addr(struct sctp_tcb *, struct sockaddr *);

void sctp_pcb_init(void);

void sctp_pcb_finish(void);

void sctp_add_local_addr_restricted(struct sctp_tcb *, struct sctp_ifa *);
void sctp_del_local_addr_restricted(struct sctp_tcb *, struct sctp_ifa *);

int
sctp_load_addresses_from_init(struct sctp_tcb *, struct mbuf *, int,
    int, struct sctphdr *, struct sockaddr *);

int
sctp_set_primary_addr(struct sctp_tcb *, struct sockaddr *,
    struct sctp_nets *);

int sctp_is_vtag_good(uint32_t, uint16_t lport, uint16_t rport, struct timeval *);

/* void sctp_drain(void); */

int sctp_destination_is_reachable(struct sctp_tcb *, struct sockaddr *);

int sctp_swap_inpcb_for_listen(struct sctp_inpcb *inp);

/*-
 * Null in last arg inpcb indicate run on ALL ep's. Specific inp in last arg
 * indicates run on ONLY assoc's of the specified endpoint.
 */
int
sctp_initiate_iterator(inp_func inpf,
    asoc_func af,
    inp_func inpe,
    uint32_t, uint32_t,
    uint32_t, void *,
    uint32_t,
    end_func ef,
    struct sctp_inpcb *,
    uint8_t co_off);

#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
void
     sctp_queue_to_mcore(struct mbuf *m, int off, int cpu_to_use);

#endif

#ifdef INVARIANTS
void
     sctp_validate_no_locks(struct sctp_inpcb *inp);

#endif

#endif				/* _KERNEL */
#endif				/* !__sctp_pcb_h__ */

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