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Fixed MTP to work with TWRP

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awab228 2018-06-19 23:16:04 +02:00
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120
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/* SCTP kernel implementation
* (C) Copyright 2007 Hewlett-Packard Development Company, L.P.
*
* This file is part of the SCTP kernel implementation
*
* 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:
* Vlad Yasevich <vladislav.yasevich@hp.com>
*/
#ifndef __sctp_auth_h__
#define __sctp_auth_h__
#include <linux/list.h>
#include <linux/crypto.h>
struct sctp_endpoint;
struct sctp_association;
struct sctp_authkey;
struct sctp_hmacalgo;
/*
* Define a generic struct that will hold all the info
* necessary for an HMAC transform
*/
struct sctp_hmac {
__u16 hmac_id; /* one of the above ids */
char *hmac_name; /* name for loading */
__u16 hmac_len; /* length of the signature */
};
/* This is generic structure that containst authentication bytes used
* as keying material. It's a what is referred to as byte-vector all
* over SCTP-AUTH
*/
struct sctp_auth_bytes {
atomic_t refcnt;
__u32 len;
__u8 data[];
};
/* Definition for a shared key, weather endpoint or association */
struct sctp_shared_key {
struct list_head key_list;
__u16 key_id;
struct sctp_auth_bytes *key;
};
#define key_for_each(__key, __list_head) \
list_for_each_entry(__key, __list_head, key_list)
#define key_for_each_safe(__key, __tmp, __list_head) \
list_for_each_entry_safe(__key, __tmp, __list_head, key_list)
static inline void sctp_auth_key_hold(struct sctp_auth_bytes *key)
{
if (!key)
return;
atomic_inc(&key->refcnt);
}
void sctp_auth_key_put(struct sctp_auth_bytes *key);
struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp);
void sctp_auth_destroy_keys(struct list_head *keys);
int sctp_auth_asoc_init_active_key(struct sctp_association *asoc, gfp_t gfp);
struct sctp_shared_key *sctp_auth_get_shkey(
const struct sctp_association *asoc,
__u16 key_id);
int sctp_auth_asoc_copy_shkeys(const struct sctp_endpoint *ep,
struct sctp_association *asoc,
gfp_t gfp);
int sctp_auth_init_hmacs(struct sctp_endpoint *ep, gfp_t gfp);
void sctp_auth_destroy_hmacs(struct crypto_hash *auth_hmacs[]);
struct sctp_hmac *sctp_auth_get_hmac(__u16 hmac_id);
struct sctp_hmac *sctp_auth_asoc_get_hmac(const struct sctp_association *asoc);
void sctp_auth_asoc_set_default_hmac(struct sctp_association *asoc,
struct sctp_hmac_algo_param *hmacs);
int sctp_auth_asoc_verify_hmac_id(const struct sctp_association *asoc,
__be16 hmac_id);
int sctp_auth_send_cid(sctp_cid_t chunk, const struct sctp_association *asoc);
int sctp_auth_recv_cid(sctp_cid_t chunk, const struct sctp_association *asoc);
void sctp_auth_calculate_hmac(const struct sctp_association *asoc,
struct sk_buff *skb,
struct sctp_auth_chunk *auth, gfp_t gfp);
/* API Helpers */
int sctp_auth_ep_add_chunkid(struct sctp_endpoint *ep, __u8 chunk_id);
int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep,
struct sctp_hmacalgo *hmacs);
int sctp_auth_set_key(struct sctp_endpoint *ep,
struct sctp_association *asoc,
struct sctp_authkey *auth_key);
int sctp_auth_set_active_key(struct sctp_endpoint *ep,
struct sctp_association *asoc,
__u16 key_id);
int sctp_auth_del_key_id(struct sctp_endpoint *ep,
struct sctp_association *asoc,
__u16 key_id);
#endif

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/* SCTP kernel reference Implementation
* Copyright (c) 1999-2001 Motorola, Inc.
* Copyright (c) 2001-2003 International Business Machines, Corp.
*
* This file is part of the SCTP kernel reference Implementation
*
* SCTP Checksum functions
*
* The SCTP reference 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.
*
* The SCTP reference 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:
* Dinakaran Joseph
* Jon Grimm <jgrimm@us.ibm.com>
* Sridhar Samudrala <sri@us.ibm.com>
*
* Rewritten to use libcrc32c by:
* Vlad Yasevich <vladislav.yasevich@hp.com>
*/
#ifndef __sctp_checksum_h__
#define __sctp_checksum_h__
#include <linux/types.h>
#include <net/sctp/sctp.h>
#include <linux/crc32c.h>
#include <linux/crc32.h>
static inline __wsum sctp_csum_update(const void *buff, int len, __wsum sum)
{
/* This uses the crypto implementation of crc32c, which is either
* implemented w/ hardware support or resolves to __crc32c_le().
*/
return crc32c(sum, buff, len);
}
static inline __wsum sctp_csum_combine(__wsum csum, __wsum csum2,
int offset, int len)
{
return __crc32c_le_combine(csum, csum2, len);
}
static inline __le32 sctp_compute_cksum(const struct sk_buff *skb,
unsigned int offset)
{
struct sctphdr *sh = sctp_hdr(skb);
__le32 ret, old = sh->checksum;
const struct skb_checksum_ops ops = {
.update = sctp_csum_update,
.combine = sctp_csum_combine,
};
sh->checksum = 0;
ret = cpu_to_le32(~__skb_checksum(skb, offset, skb->len - offset,
~(__u32)0, &ops));
sh->checksum = old;
return ret;
}
#endif /* __sctp_checksum_h__ */

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/* SCTP kernel Implementation
* (C) Copyright IBM Corp. 2001, 2004
* Copyright (C) 1999-2001 Cisco, Motorola
*
* This file is part of the SCTP kernel implementation
*
* These are the definitions needed for the command object.
*
* 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>
* Karl Knutson <karl@athena.chicago.il.us>
* Ardelle Fan <ardelle.fan@intel.com>
* Sridhar Samudrala <sri@us.ibm.com>
*/
#ifndef __net_sctp_command_h__
#define __net_sctp_command_h__
#include <net/sctp/constants.h>
#include <net/sctp/structs.h>
typedef enum {
SCTP_CMD_NOP = 0, /* Do nothing. */
SCTP_CMD_NEW_ASOC, /* Register a new association. */
SCTP_CMD_DELETE_TCB, /* Delete the current association. */
SCTP_CMD_NEW_STATE, /* Enter a new state. */
SCTP_CMD_REPORT_TSN, /* Record the arrival of a TSN. */
SCTP_CMD_GEN_SACK, /* Send a Selective ACK (maybe). */
SCTP_CMD_PROCESS_SACK, /* Process an inbound SACK. */
SCTP_CMD_GEN_INIT_ACK, /* Generate an INIT ACK chunk. */
SCTP_CMD_PEER_INIT, /* Process a INIT from the peer. */
SCTP_CMD_GEN_COOKIE_ECHO, /* Generate a COOKIE ECHO chunk. */
SCTP_CMD_CHUNK_ULP, /* Send a chunk to the sockets layer. */
SCTP_CMD_EVENT_ULP, /* Send a notification to the sockets layer. */
SCTP_CMD_REPLY, /* Send a chunk to our peer. */
SCTP_CMD_SEND_PKT, /* Send a full packet to our peer. */
SCTP_CMD_RETRAN, /* Mark a transport for retransmission. */
SCTP_CMD_ECN_CE, /* Do delayed CE processing. */
SCTP_CMD_ECN_ECNE, /* Do delayed ECNE processing. */
SCTP_CMD_ECN_CWR, /* Do delayed CWR processing. */
SCTP_CMD_TIMER_START, /* Start a timer. */
SCTP_CMD_TIMER_START_ONCE, /* Start a timer once */
SCTP_CMD_TIMER_RESTART, /* Restart a timer. */
SCTP_CMD_TIMER_STOP, /* Stop a timer. */
SCTP_CMD_INIT_CHOOSE_TRANSPORT, /* Choose transport for an INIT. */
SCTP_CMD_INIT_COUNTER_RESET, /* Reset init counter. */
SCTP_CMD_INIT_COUNTER_INC, /* Increment init counter. */
SCTP_CMD_INIT_RESTART, /* High level, do init timer work. */
SCTP_CMD_COOKIEECHO_RESTART, /* High level, do cookie-echo timer work. */
SCTP_CMD_INIT_FAILED, /* High level, do init failure work. */
SCTP_CMD_REPORT_DUP, /* Report a duplicate TSN. */
SCTP_CMD_STRIKE, /* Mark a strike against a transport. */
SCTP_CMD_HB_TIMERS_START, /* Start the heartbeat timers. */
SCTP_CMD_HB_TIMER_UPDATE, /* Update a heartbeat timers. */
SCTP_CMD_HB_TIMERS_STOP, /* Stop the heartbeat timers. */
SCTP_CMD_TRANSPORT_HB_SENT, /* Reset the status of a transport. */
SCTP_CMD_TRANSPORT_IDLE, /* Do manipulations on idle transport */
SCTP_CMD_TRANSPORT_ON, /* Mark the transport as active. */
SCTP_CMD_REPORT_ERROR, /* Pass this error back out of the sm. */
SCTP_CMD_REPORT_BAD_TAG, /* Verification tags didn't match. */
SCTP_CMD_PROCESS_CTSN, /* Sideeffect from shutdown. */
SCTP_CMD_ASSOC_FAILED, /* Handle association failure. */
SCTP_CMD_DISCARD_PACKET, /* Discard the whole packet. */
SCTP_CMD_GEN_SHUTDOWN, /* Generate a SHUTDOWN chunk. */
SCTP_CMD_UPDATE_ASSOC, /* Update association information. */
SCTP_CMD_PURGE_OUTQUEUE, /* Purge all data waiting to be sent. */
SCTP_CMD_SETUP_T2, /* Hi-level, setup T2-shutdown parms. */
SCTP_CMD_RTO_PENDING, /* Set transport's rto_pending. */
SCTP_CMD_PART_DELIVER, /* Partial data delivery considerations. */
SCTP_CMD_RENEGE, /* Renege data on an association. */
SCTP_CMD_SETUP_T4, /* ADDIP, setup T4 RTO timer parms. */
SCTP_CMD_PROCESS_OPERR, /* Process an ERROR chunk. */
SCTP_CMD_REPORT_FWDTSN, /* Report new cumulative TSN Ack. */
SCTP_CMD_PROCESS_FWDTSN, /* Skips were reported, so process further. */
SCTP_CMD_CLEAR_INIT_TAG, /* Clears association peer's inittag. */
SCTP_CMD_DEL_NON_PRIMARY, /* Removes non-primary peer transports. */
SCTP_CMD_T3_RTX_TIMERS_STOP, /* Stops T3-rtx pending timers */
SCTP_CMD_FORCE_PRIM_RETRAN, /* Forces retrans. over primary path. */
SCTP_CMD_SET_SK_ERR, /* Set sk_err */
SCTP_CMD_ASSOC_CHANGE, /* generate and send assoc_change event */
SCTP_CMD_ADAPTATION_IND, /* generate and send adaptation event */
SCTP_CMD_ASSOC_SHKEY, /* generate the association shared keys */
SCTP_CMD_T1_RETRAN, /* Mark for retransmission after T1 timeout */
SCTP_CMD_UPDATE_INITTAG, /* Update peer inittag */
SCTP_CMD_SEND_MSG, /* Send the whole use message */
SCTP_CMD_SEND_NEXT_ASCONF, /* Send the next ASCONF after ACK */
SCTP_CMD_PURGE_ASCONF_QUEUE, /* Purge all asconf queues.*/
SCTP_CMD_SET_ASOC, /* Restore association context */
SCTP_CMD_LAST
} sctp_verb_t;
/* How many commands can you put in an sctp_cmd_seq_t?
* This is a rather arbitrary number, ideally derived from a careful
* analysis of the state functions, but in reality just taken from
* thin air in the hopes othat we don't trigger a kernel panic.
*/
#define SCTP_MAX_NUM_COMMANDS 20
typedef union {
void *zero_all; /* Set to NULL to clear the entire union */
__s32 i32;
__u32 u32;
__be32 be32;
__u16 u16;
__u8 u8;
int error;
__be16 err;
sctp_state_t state;
sctp_event_timeout_t to;
struct sctp_chunk *chunk;
struct sctp_association *asoc;
struct sctp_transport *transport;
struct sctp_bind_addr *bp;
sctp_init_chunk_t *init;
struct sctp_ulpevent *ulpevent;
struct sctp_packet *packet;
sctp_sackhdr_t *sackh;
struct sctp_datamsg *msg;
} sctp_arg_t;
/* We are simulating ML type constructors here.
*
* SCTP_ARG_CONSTRUCTOR(NAME, TYPE, ELT) builds a function called
* SCTP_NAME() which takes an argument of type TYPE and returns an
* sctp_arg_t. It does this by inserting the sole argument into the
* ELT union element of a local sctp_arg_t.
*
* E.g., SCTP_ARG_CONSTRUCTOR(I32, __s32, i32) builds SCTP_I32(arg),
* which takes an __s32 and returns a sctp_arg_t containing the
* __s32. So, after foo = SCTP_I32(arg), foo.i32 == arg.
*/
#define SCTP_ARG_CONSTRUCTOR(name, type, elt) \
static inline sctp_arg_t \
SCTP_## name (type arg) \
{ sctp_arg_t retval;\
retval.zero_all = NULL;\
retval.elt = arg;\
return retval;\
}
SCTP_ARG_CONSTRUCTOR(I32, __s32, i32)
SCTP_ARG_CONSTRUCTOR(U32, __u32, u32)
SCTP_ARG_CONSTRUCTOR(BE32, __be32, be32)
SCTP_ARG_CONSTRUCTOR(U16, __u16, u16)
SCTP_ARG_CONSTRUCTOR(U8, __u8, u8)
SCTP_ARG_CONSTRUCTOR(ERROR, int, error)
SCTP_ARG_CONSTRUCTOR(PERR, __be16, err) /* protocol error */
SCTP_ARG_CONSTRUCTOR(STATE, sctp_state_t, state)
SCTP_ARG_CONSTRUCTOR(TO, sctp_event_timeout_t, to)
SCTP_ARG_CONSTRUCTOR(CHUNK, struct sctp_chunk *, chunk)
SCTP_ARG_CONSTRUCTOR(ASOC, struct sctp_association *, asoc)
SCTP_ARG_CONSTRUCTOR(TRANSPORT, struct sctp_transport *, transport)
SCTP_ARG_CONSTRUCTOR(BA, struct sctp_bind_addr *, bp)
SCTP_ARG_CONSTRUCTOR(PEER_INIT, sctp_init_chunk_t *, init)
SCTP_ARG_CONSTRUCTOR(ULPEVENT, struct sctp_ulpevent *, ulpevent)
SCTP_ARG_CONSTRUCTOR(PACKET, struct sctp_packet *, packet)
SCTP_ARG_CONSTRUCTOR(SACKH, sctp_sackhdr_t *, sackh)
SCTP_ARG_CONSTRUCTOR(DATAMSG, struct sctp_datamsg *, msg)
static inline sctp_arg_t SCTP_FORCE(void)
{
return SCTP_I32(1);
}
static inline sctp_arg_t SCTP_NOFORCE(void)
{
return SCTP_I32(0);
}
static inline sctp_arg_t SCTP_NULL(void)
{
sctp_arg_t retval;
retval.zero_all = NULL;
return retval;
}
typedef struct {
sctp_arg_t obj;
sctp_verb_t verb;
} sctp_cmd_t;
typedef struct {
sctp_cmd_t cmds[SCTP_MAX_NUM_COMMANDS];
sctp_cmd_t *last_used_slot;
sctp_cmd_t *next_cmd;
} sctp_cmd_seq_t;
/* Initialize a block of memory as a command sequence.
* Return 0 if the initialization fails.
*/
static inline int sctp_init_cmd_seq(sctp_cmd_seq_t *seq)
{
/* cmds[] is filled backwards to simplify the overflow BUG() check */
seq->last_used_slot = seq->cmds + SCTP_MAX_NUM_COMMANDS;
seq->next_cmd = seq->last_used_slot;
return 1; /* We always succeed. */
}
/* Add a command to an sctp_cmd_seq_t.
*
* Use the SCTP_* constructors defined by SCTP_ARG_CONSTRUCTOR() above
* to wrap data which goes in the obj argument.
*/
static inline void sctp_add_cmd_sf(sctp_cmd_seq_t *seq, sctp_verb_t verb,
sctp_arg_t obj)
{
sctp_cmd_t *cmd = seq->last_used_slot - 1;
BUG_ON(cmd < seq->cmds);
cmd->verb = verb;
cmd->obj = obj;
seq->last_used_slot = cmd;
}
/* Return the next command structure in an sctp_cmd_seq.
* Return NULL at the end of the sequence.
*/
static inline sctp_cmd_t *sctp_next_cmd(sctp_cmd_seq_t *seq)
{
if (seq->next_cmd <= seq->last_used_slot)
return NULL;
return --seq->next_cmd;
}
#endif /* __net_sctp_command_h__ */

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/* 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.
*
* This file is part of the SCTP kernel implementation
*
* 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>
* Karl Knutson <karl@athena.chicago.il.us>
* Randall Stewart <randall@stewart.chicago.il.us>
* Ken Morneau <kmorneau@cisco.com>
* Qiaobing Xie <qxie1@motorola.com>
* Xingang Guo <xingang.guo@intel.com>
* Sridhar Samudrala <samudrala@us.ibm.com>
* Daisy Chang <daisyc@us.ibm.com>
*/
#ifndef __sctp_constants_h__
#define __sctp_constants_h__
#include <linux/sctp.h>
#include <linux/ipv6.h> /* For ipv6hdr. */
#include <net/tcp_states.h> /* For TCP states used in sctp_sock_state_t */
/* Value used for stream negotiation. */
enum { SCTP_MAX_STREAM = 0xffff };
enum { SCTP_DEFAULT_OUTSTREAMS = 10 };
enum { SCTP_DEFAULT_INSTREAMS = SCTP_MAX_STREAM };
/* Since CIDs are sparse, we need all four of the following
* symbols. CIDs are dense through SCTP_CID_BASE_MAX.
*/
#define SCTP_CID_BASE_MAX SCTP_CID_SHUTDOWN_COMPLETE
#define SCTP_NUM_BASE_CHUNK_TYPES (SCTP_CID_BASE_MAX + 1)
#define SCTP_NUM_ADDIP_CHUNK_TYPES 2
#define SCTP_NUM_PRSCTP_CHUNK_TYPES 1
#define SCTP_NUM_AUTH_CHUNK_TYPES 1
#define SCTP_NUM_CHUNK_TYPES (SCTP_NUM_BASE_CHUNK_TYPES + \
SCTP_NUM_ADDIP_CHUNK_TYPES +\
SCTP_NUM_PRSCTP_CHUNK_TYPES +\
SCTP_NUM_AUTH_CHUNK_TYPES)
/* These are the different flavours of event. */
typedef enum {
SCTP_EVENT_T_CHUNK = 1,
SCTP_EVENT_T_TIMEOUT,
SCTP_EVENT_T_OTHER,
SCTP_EVENT_T_PRIMITIVE
} sctp_event_t;
/* As a convenience for the state machine, we append SCTP_EVENT_* and
* SCTP_ULP_* to the list of possible chunks.
*/
typedef enum {
SCTP_EVENT_TIMEOUT_NONE = 0,
SCTP_EVENT_TIMEOUT_T1_COOKIE,
SCTP_EVENT_TIMEOUT_T1_INIT,
SCTP_EVENT_TIMEOUT_T2_SHUTDOWN,
SCTP_EVENT_TIMEOUT_T3_RTX,
SCTP_EVENT_TIMEOUT_T4_RTO,
SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD,
SCTP_EVENT_TIMEOUT_HEARTBEAT,
SCTP_EVENT_TIMEOUT_SACK,
SCTP_EVENT_TIMEOUT_AUTOCLOSE,
} sctp_event_timeout_t;
#define SCTP_EVENT_TIMEOUT_MAX SCTP_EVENT_TIMEOUT_AUTOCLOSE
#define SCTP_NUM_TIMEOUT_TYPES (SCTP_EVENT_TIMEOUT_MAX + 1)
typedef enum {
SCTP_EVENT_NO_PENDING_TSN = 0,
SCTP_EVENT_ICMP_PROTO_UNREACH,
} sctp_event_other_t;
#define SCTP_EVENT_OTHER_MAX SCTP_EVENT_ICMP_PROTO_UNREACH
#define SCTP_NUM_OTHER_TYPES (SCTP_EVENT_OTHER_MAX + 1)
/* These are primitive requests from the ULP. */
typedef enum {
SCTP_PRIMITIVE_ASSOCIATE = 0,
SCTP_PRIMITIVE_SHUTDOWN,
SCTP_PRIMITIVE_ABORT,
SCTP_PRIMITIVE_SEND,
SCTP_PRIMITIVE_REQUESTHEARTBEAT,
SCTP_PRIMITIVE_ASCONF,
} sctp_event_primitive_t;
#define SCTP_EVENT_PRIMITIVE_MAX SCTP_PRIMITIVE_ASCONF
#define SCTP_NUM_PRIMITIVE_TYPES (SCTP_EVENT_PRIMITIVE_MAX + 1)
/* We define here a utility type for manipulating subtypes.
* The subtype constructors all work like this:
*
* sctp_subtype_t foo = SCTP_ST_CHUNK(SCTP_CID_INIT);
*/
typedef union {
sctp_cid_t chunk;
sctp_event_timeout_t timeout;
sctp_event_other_t other;
sctp_event_primitive_t primitive;
} sctp_subtype_t;
#define SCTP_SUBTYPE_CONSTRUCTOR(_name, _type, _elt) \
static inline sctp_subtype_t \
SCTP_ST_## _name (_type _arg) \
{ sctp_subtype_t _retval; _retval._elt = _arg; return _retval; }
SCTP_SUBTYPE_CONSTRUCTOR(CHUNK, sctp_cid_t, chunk)
SCTP_SUBTYPE_CONSTRUCTOR(TIMEOUT, sctp_event_timeout_t, timeout)
SCTP_SUBTYPE_CONSTRUCTOR(OTHER, sctp_event_other_t, other)
SCTP_SUBTYPE_CONSTRUCTOR(PRIMITIVE, sctp_event_primitive_t, primitive)
#define sctp_chunk_is_data(a) (a->chunk_hdr->type == SCTP_CID_DATA)
/* Calculate the actual data size in a data chunk */
#define SCTP_DATA_SNDSIZE(c) ((int)((unsigned long)(c->chunk_end)\
- (unsigned long)(c->chunk_hdr)\
- sizeof(sctp_data_chunk_t)))
/* Internal error codes */
typedef enum {
SCTP_IERROR_NO_ERROR = 0,
SCTP_IERROR_BASE = 1000,
SCTP_IERROR_NO_COOKIE,
SCTP_IERROR_BAD_SIG,
SCTP_IERROR_STALE_COOKIE,
SCTP_IERROR_NOMEM,
SCTP_IERROR_MALFORMED,
SCTP_IERROR_BAD_TAG,
SCTP_IERROR_BIG_GAP,
SCTP_IERROR_DUP_TSN,
SCTP_IERROR_HIGH_TSN,
SCTP_IERROR_IGNORE_TSN,
SCTP_IERROR_NO_DATA,
SCTP_IERROR_BAD_STREAM,
SCTP_IERROR_BAD_PORTS,
SCTP_IERROR_AUTH_BAD_HMAC,
SCTP_IERROR_AUTH_BAD_KEYID,
SCTP_IERROR_PROTO_VIOLATION,
SCTP_IERROR_ERROR,
SCTP_IERROR_ABORT,
} sctp_ierror_t;
/* SCTP state defines for internal state machine */
typedef enum {
SCTP_STATE_CLOSED = 0,
SCTP_STATE_COOKIE_WAIT = 1,
SCTP_STATE_COOKIE_ECHOED = 2,
SCTP_STATE_ESTABLISHED = 3,
SCTP_STATE_SHUTDOWN_PENDING = 4,
SCTP_STATE_SHUTDOWN_SENT = 5,
SCTP_STATE_SHUTDOWN_RECEIVED = 6,
SCTP_STATE_SHUTDOWN_ACK_SENT = 7,
} sctp_state_t;
#define SCTP_STATE_MAX SCTP_STATE_SHUTDOWN_ACK_SENT
#define SCTP_STATE_NUM_STATES (SCTP_STATE_MAX + 1)
/* These are values for sk->state.
* For a UDP-style SCTP socket, the states are defined as follows
* - A socket in SCTP_SS_CLOSED state indicates that it is not willing to
* accept new associations, but it can initiate the creation of new ones.
* - A socket in SCTP_SS_LISTENING state indicates that it is willing to
* accept new associations and can initiate the creation of new ones.
* - A socket in SCTP_SS_ESTABLISHED state indicates that it is a peeled off
* socket with one association.
* For a TCP-style SCTP socket, the states are defined as follows
* - A socket in SCTP_SS_CLOSED state indicates that it is not willing to
* accept new associations, but it can initiate the creation of new ones.
* - A socket in SCTP_SS_LISTENING state indicates that it is willing to
* accept new associations, but cannot initiate the creation of new ones.
* - A socket in SCTP_SS_ESTABLISHED state indicates that it has a single
* association.
*/
typedef enum {
SCTP_SS_CLOSED = TCP_CLOSE,
SCTP_SS_LISTENING = TCP_LISTEN,
SCTP_SS_ESTABLISHING = TCP_SYN_SENT,
SCTP_SS_ESTABLISHED = TCP_ESTABLISHED,
SCTP_SS_CLOSING = TCP_CLOSING,
} sctp_sock_state_t;
/* These functions map various type to printable names. */
const char *sctp_cname(const sctp_subtype_t); /* chunk types */
const char *sctp_oname(const sctp_subtype_t); /* other events */
const char *sctp_tname(const sctp_subtype_t); /* timeouts */
const char *sctp_pname(const sctp_subtype_t); /* primitives */
/* This is a table of printable names of sctp_state_t's. */
extern const char *const sctp_state_tbl[];
extern const char *const sctp_evttype_tbl[];
extern const char *const sctp_status_tbl[];
/* Maximum chunk length considering padding requirements. */
enum { SCTP_MAX_CHUNK_LEN = ((1<<16) - sizeof(__u32)) };
/* Encourage Cookie-Echo bundling by pre-fragmenting chunks a little
* harder (until reaching ESTABLISHED state).
*/
enum { SCTP_ARBITRARY_COOKIE_ECHO_LEN = 200 };
/* Guess at how big to make the TSN mapping array.
* We guarantee that we can handle at least this big a gap between the
* cumulative ACK and the highest TSN. In practice, we can often
* handle up to twice this value.
*
* NEVER make this more than 32767 (2^15-1). The Gap Ack Blocks in a
* SACK (see section 3.3.4) are only 16 bits, so 2*SCTP_TSN_MAP_SIZE
* must be less than 65535 (2^16 - 1), or we will have overflow
* problems creating SACK's.
*/
#define SCTP_TSN_MAP_INITIAL BITS_PER_LONG
#define SCTP_TSN_MAP_INCREMENT SCTP_TSN_MAP_INITIAL
#define SCTP_TSN_MAP_SIZE 4096
/* We will not record more than this many duplicate TSNs between two
* SACKs. The minimum PMTU is 576. Remove all the headers and there
* is enough room for 131 duplicate reports. Round down to the
* nearest power of 2.
*/
enum { SCTP_MIN_PMTU = 576 };
enum { SCTP_MAX_DUP_TSNS = 16 };
enum { SCTP_MAX_GABS = 16 };
/* Heartbeat interval - 30 secs */
#define SCTP_DEFAULT_TIMEOUT_HEARTBEAT (30*1000)
/* Delayed sack timer - 200ms */
#define SCTP_DEFAULT_TIMEOUT_SACK (200)
/* RTO.Initial - 3 seconds
* RTO.Min - 1 second
* RTO.Max - 60 seconds
* RTO.Alpha - 1/8
* RTO.Beta - 1/4
*/
#define SCTP_RTO_INITIAL (3 * 1000)
#define SCTP_RTO_MIN (1 * 1000)
#define SCTP_RTO_MAX (60 * 1000)
#define SCTP_RTO_ALPHA 3 /* 1/8 when converted to right shifts. */
#define SCTP_RTO_BETA 2 /* 1/4 when converted to right shifts. */
/* Maximum number of new data packets that can be sent in a burst. */
#define SCTP_DEFAULT_MAX_BURST 4
#define SCTP_CLOCK_GRANULARITY 1 /* 1 jiffy */
#define SCTP_DEFAULT_COOKIE_LIFE (60 * 1000) /* 60 seconds */
#define SCTP_DEFAULT_MINWINDOW 1500 /* default minimum rwnd size */
#define SCTP_DEFAULT_MAXWINDOW 65535 /* default rwnd size */
#define SCTP_DEFAULT_RWND_SHIFT 4 /* by default, update on 1/16 of
* rcvbuf, which is 1/8 of initial
* window
*/
#define SCTP_DEFAULT_MAXSEGMENT 1500 /* MTU size, this is the limit
* to which we will raise the P-MTU.
*/
#define SCTP_DEFAULT_MINSEGMENT 512 /* MTU size ... if no mtu disc */
#define SCTP_SECRET_SIZE 32 /* Number of octets in a 256 bits. */
#define SCTP_SIGNATURE_SIZE 20 /* size of a SLA-1 signature */
#define SCTP_COOKIE_MULTIPLE 32 /* Pad out our cookie to make our hash
* functions simpler to write.
*/
/* These return values describe the success or failure of a number of
* routines which form the lower interface to SCTP_outqueue.
*/
typedef enum {
SCTP_XMIT_OK,
SCTP_XMIT_PMTU_FULL,
SCTP_XMIT_RWND_FULL,
SCTP_XMIT_DELAY,
} sctp_xmit_t;
/* These are the commands for manipulating transports. */
typedef enum {
SCTP_TRANSPORT_UP,
SCTP_TRANSPORT_DOWN,
SCTP_TRANSPORT_PF,
} sctp_transport_cmd_t;
/* These are the address scopes defined mainly for IPv4 addresses
* based on draft of SCTP IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
* These scopes are hopefully generic enough to be used on scoping both
* IPv4 and IPv6 addresses in SCTP.
* At this point, the IPv6 scopes will be mapped to these internal scopes
* as much as possible.
*/
typedef enum {
SCTP_SCOPE_GLOBAL, /* IPv4 global addresses */
SCTP_SCOPE_PRIVATE, /* IPv4 private addresses */
SCTP_SCOPE_LINK, /* IPv4 link local address */
SCTP_SCOPE_LOOPBACK, /* IPv4 loopback address */
SCTP_SCOPE_UNUSABLE, /* IPv4 unusable addresses */
} sctp_scope_t;
typedef enum {
SCTP_SCOPE_POLICY_DISABLE, /* Disable IPv4 address scoping */
SCTP_SCOPE_POLICY_ENABLE, /* Enable IPv4 address scoping */
SCTP_SCOPE_POLICY_PRIVATE, /* Follow draft but allow IPv4 private addresses */
SCTP_SCOPE_POLICY_LINK, /* Follow draft but allow IPv4 link local addresses */
} sctp_scope_policy_t;
/* Based on IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>,
* SCTP IPv4 unusable addresses: 0.0.0.0/8, 224.0.0.0/4, 198.18.0.0/24,
* 192.88.99.0/24.
* Also, RFC 8.4, non-unicast addresses are not considered valid SCTP
* addresses.
*/
#define IS_IPV4_UNUSABLE_ADDRESS(a) \
((htonl(INADDR_BROADCAST) == a) || \
ipv4_is_multicast(a) || \
ipv4_is_zeronet(a) || \
ipv4_is_test_198(a) || \
ipv4_is_anycast_6to4(a))
/* Flags used for the bind address copy functions. */
#define SCTP_ADDR6_ALLOWED 0x00000001 /* IPv6 address is allowed by
local sock family */
#define SCTP_ADDR4_PEERSUPP 0x00000002 /* IPv4 address is supported by
peer */
#define SCTP_ADDR6_PEERSUPP 0x00000004 /* IPv6 address is supported by
peer */
/* Reasons to retransmit. */
typedef enum {
SCTP_RTXR_T3_RTX,
SCTP_RTXR_FAST_RTX,
SCTP_RTXR_PMTUD,
SCTP_RTXR_T1_RTX,
} sctp_retransmit_reason_t;
/* Reasons to lower cwnd. */
typedef enum {
SCTP_LOWER_CWND_T3_RTX,
SCTP_LOWER_CWND_FAST_RTX,
SCTP_LOWER_CWND_ECNE,
SCTP_LOWER_CWND_INACTIVE,
} sctp_lower_cwnd_t;
/* SCTP-AUTH Necessary constants */
/* SCTP-AUTH, Section 3.3
*
* The following Table 2 shows the currently defined values for HMAC
* identifiers.
*
* +-----------------+--------------------------+
* | HMAC Identifier | Message Digest Algorithm |
* +-----------------+--------------------------+
* | 0 | Reserved |
* | 1 | SHA-1 defined in [8] |
* | 2 | Reserved |
* | 3 | SHA-256 defined in [8] |
* +-----------------+--------------------------+
*/
enum {
SCTP_AUTH_HMAC_ID_RESERVED_0,
SCTP_AUTH_HMAC_ID_SHA1,
SCTP_AUTH_HMAC_ID_RESERVED_2,
#if defined (CONFIG_CRYPTO_SHA256) || defined (CONFIG_CRYPTO_SHA256_MODULE)
SCTP_AUTH_HMAC_ID_SHA256,
#endif
__SCTP_AUTH_HMAC_MAX
};
#define SCTP_AUTH_HMAC_ID_MAX __SCTP_AUTH_HMAC_MAX - 1
#define SCTP_AUTH_NUM_HMACS __SCTP_AUTH_HMAC_MAX
#define SCTP_SHA1_SIG_SIZE 20
#define SCTP_SHA256_SIG_SIZE 32
/* SCTP-AUTH, Section 3.2
* The chunk types for INIT, INIT-ACK, SHUTDOWN-COMPLETE and AUTH chunks
* MUST NOT be listed in the CHUNKS parameter
*/
#define SCTP_NUM_NOAUTH_CHUNKS 4
#define SCTP_AUTH_MAX_CHUNKS (SCTP_NUM_CHUNK_TYPES - SCTP_NUM_NOAUTH_CHUNKS)
/* SCTP-AUTH Section 6.1
* The RANDOM parameter MUST contain a 32 byte random number.
*/
#define SCTP_AUTH_RANDOM_LENGTH 32
#endif /* __sctp_constants_h__ */

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/* 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);
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 *);
struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
/*
* 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;
}
static inline enum sctp_sstat_state
sctp_assoc_to_state(const struct sctp_association *asoc)
{
/* SCTP's uapi always had SCTP_EMPTY(=0) as a dummy state, but we
* got rid of it in kernel space. Therefore SCTP_CLOSED et al
* start at =1 in user space, but actually as =0 in kernel space.
* Now that we can not break user space and SCTP_EMPTY is exposed
* there, we need to fix it up with an ugly offset not to break
* applications. :(
*/
return asoc->state + 1;
}
/* 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);
}
/* 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_flowinfo = 0;
addr->v6.sin6_scope_id = 0;
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__ */

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/* 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.
*
* This file is part of the SCTP kernel implementation
*
* These are definitions needed by the state machine.
*
* 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 addresses:
* lksctp developers <linux-sctp@vger.kernel.org>
*
* Written or modified by:
* La Monte H.P. Yarroll <piggy@acm.org>
* Karl Knutson <karl@athena.chicago.il.us>
* Xingang Guo <xingang.guo@intel.com>
* Jon Grimm <jgrimm@us.ibm.com>
* Dajiang Zhang <dajiang.zhang@nokia.com>
* Sridhar Samudrala <sri@us.ibm.com>
* Daisy Chang <daisyc@us.ibm.com>
* Ardelle Fan <ardelle.fan@intel.com>
* Kevin Gao <kevin.gao@intel.com>
*/
#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <net/sctp/command.h>
#include <net/sctp/sctp.h>
#ifndef __sctp_sm_h__
#define __sctp_sm_h__
/*
* Possible values for the disposition are:
*/
typedef enum {
SCTP_DISPOSITION_DISCARD, /* No further processing. */
SCTP_DISPOSITION_CONSUME, /* Process return values normally. */
SCTP_DISPOSITION_NOMEM, /* We ran out of memory--recover. */
SCTP_DISPOSITION_DELETE_TCB, /* Close the association. */
SCTP_DISPOSITION_ABORT, /* Close the association NOW. */
SCTP_DISPOSITION_VIOLATION, /* The peer is misbehaving. */
SCTP_DISPOSITION_NOT_IMPL, /* This entry is not implemented. */
SCTP_DISPOSITION_ERROR, /* This is plain old user error. */
SCTP_DISPOSITION_BUG, /* This is a bug. */
} sctp_disposition_t;
typedef struct {
int name;
int action;
} sctp_sm_command_t;
typedef sctp_disposition_t (sctp_state_fn_t) (struct net *,
const struct sctp_endpoint *,
const struct sctp_association *,
const sctp_subtype_t type,
void *arg,
sctp_cmd_seq_t *);
typedef void (sctp_timer_event_t) (unsigned long);
typedef struct {
sctp_state_fn_t *fn;
const char *name;
} sctp_sm_table_entry_t;
/* A naming convention of "sctp_sf_xxx" applies to all the state functions
* currently in use.
*/
/* Prototypes for generic state functions. */
sctp_state_fn_t sctp_sf_not_impl;
sctp_state_fn_t sctp_sf_bug;
/* Prototypes for gener timer state functions. */
sctp_state_fn_t sctp_sf_timer_ignore;
/* Prototypes for chunk state functions. */
sctp_state_fn_t sctp_sf_do_9_1_abort;
sctp_state_fn_t sctp_sf_cookie_wait_abort;
sctp_state_fn_t sctp_sf_cookie_echoed_abort;
sctp_state_fn_t sctp_sf_shutdown_pending_abort;
sctp_state_fn_t sctp_sf_shutdown_sent_abort;
sctp_state_fn_t sctp_sf_shutdown_ack_sent_abort;
sctp_state_fn_t sctp_sf_do_5_1B_init;
sctp_state_fn_t sctp_sf_do_5_1C_ack;
sctp_state_fn_t sctp_sf_do_5_1D_ce;
sctp_state_fn_t sctp_sf_do_5_1E_ca;
sctp_state_fn_t sctp_sf_do_4_C;
sctp_state_fn_t sctp_sf_eat_data_6_2;
sctp_state_fn_t sctp_sf_eat_data_fast_4_4;
sctp_state_fn_t sctp_sf_eat_sack_6_2;
sctp_state_fn_t sctp_sf_operr_notify;
sctp_state_fn_t sctp_sf_t1_init_timer_expire;
sctp_state_fn_t sctp_sf_t1_cookie_timer_expire;
sctp_state_fn_t sctp_sf_t2_timer_expire;
sctp_state_fn_t sctp_sf_t4_timer_expire;
sctp_state_fn_t sctp_sf_t5_timer_expire;
sctp_state_fn_t sctp_sf_sendbeat_8_3;
sctp_state_fn_t sctp_sf_beat_8_3;
sctp_state_fn_t sctp_sf_backbeat_8_3;
sctp_state_fn_t sctp_sf_do_9_2_final;
sctp_state_fn_t sctp_sf_do_9_2_shutdown;
sctp_state_fn_t sctp_sf_do_9_2_shut_ctsn;
sctp_state_fn_t sctp_sf_do_ecn_cwr;
sctp_state_fn_t sctp_sf_do_ecne;
sctp_state_fn_t sctp_sf_ootb;
sctp_state_fn_t sctp_sf_pdiscard;
sctp_state_fn_t sctp_sf_violation;
sctp_state_fn_t sctp_sf_discard_chunk;
sctp_state_fn_t sctp_sf_do_5_2_1_siminit;
sctp_state_fn_t sctp_sf_do_5_2_2_dupinit;
sctp_state_fn_t sctp_sf_do_5_2_3_initack;
sctp_state_fn_t sctp_sf_do_5_2_4_dupcook;
sctp_state_fn_t sctp_sf_unk_chunk;
sctp_state_fn_t sctp_sf_do_8_5_1_E_sa;
sctp_state_fn_t sctp_sf_cookie_echoed_err;
sctp_state_fn_t sctp_sf_do_asconf;
sctp_state_fn_t sctp_sf_do_asconf_ack;
sctp_state_fn_t sctp_sf_do_9_2_reshutack;
sctp_state_fn_t sctp_sf_eat_fwd_tsn;
sctp_state_fn_t sctp_sf_eat_fwd_tsn_fast;
sctp_state_fn_t sctp_sf_eat_auth;
/* Prototypes for primitive event state functions. */
sctp_state_fn_t sctp_sf_do_prm_asoc;
sctp_state_fn_t sctp_sf_do_prm_send;
sctp_state_fn_t sctp_sf_do_9_2_prm_shutdown;
sctp_state_fn_t sctp_sf_cookie_wait_prm_shutdown;
sctp_state_fn_t sctp_sf_cookie_echoed_prm_shutdown;
sctp_state_fn_t sctp_sf_do_9_1_prm_abort;
sctp_state_fn_t sctp_sf_cookie_wait_prm_abort;
sctp_state_fn_t sctp_sf_cookie_echoed_prm_abort;
sctp_state_fn_t sctp_sf_shutdown_pending_prm_abort;
sctp_state_fn_t sctp_sf_shutdown_sent_prm_abort;
sctp_state_fn_t sctp_sf_shutdown_ack_sent_prm_abort;
sctp_state_fn_t sctp_sf_error_closed;
sctp_state_fn_t sctp_sf_error_shutdown;
sctp_state_fn_t sctp_sf_ignore_primitive;
sctp_state_fn_t sctp_sf_do_prm_requestheartbeat;
sctp_state_fn_t sctp_sf_do_prm_asconf;
/* Prototypes for other event state functions. */
sctp_state_fn_t sctp_sf_do_no_pending_tsn;
sctp_state_fn_t sctp_sf_do_9_2_start_shutdown;
sctp_state_fn_t sctp_sf_do_9_2_shutdown_ack;
sctp_state_fn_t sctp_sf_ignore_other;
sctp_state_fn_t sctp_sf_cookie_wait_icmp_abort;
/* Prototypes for timeout event state functions. */
sctp_state_fn_t sctp_sf_do_6_3_3_rtx;
sctp_state_fn_t sctp_sf_do_6_2_sack;
sctp_state_fn_t sctp_sf_autoclose_timer_expire;
/* Prototypes for utility support functions. */
__u8 sctp_get_chunk_type(struct sctp_chunk *chunk);
const sctp_sm_table_entry_t *sctp_sm_lookup_event(struct net *,
sctp_event_t,
sctp_state_t,
sctp_subtype_t);
int sctp_chunk_iif(const struct sctp_chunk *);
struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *,
struct sctp_chunk *,
gfp_t gfp);
__u32 sctp_generate_verification_tag(void);
void sctp_populate_tie_tags(__u8 *cookie, __u32 curTag, __u32 hisTag);
/* Prototypes for chunk-building functions. */
struct sctp_chunk *sctp_make_init(const struct sctp_association *,
const struct sctp_bind_addr *,
gfp_t gfp, int vparam_len);
struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *,
const struct sctp_chunk *,
const gfp_t gfp,
const int unkparam_len);
struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *,
const struct sctp_chunk *);
struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *,
const struct sctp_chunk *);
struct sctp_chunk *sctp_make_cwr(const struct sctp_association *,
const __u32 lowest_tsn,
const struct sctp_chunk *);
struct sctp_chunk * sctp_make_datafrag_empty(struct sctp_association *,
const struct sctp_sndrcvinfo *sinfo,
int len, const __u8 flags,
__u16 ssn);
struct sctp_chunk *sctp_make_ecne(const struct sctp_association *,
const __u32);
struct sctp_chunk *sctp_make_sack(const struct sctp_association *);
struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
const struct sctp_chunk *chunk);
struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
const struct sctp_chunk *);
struct sctp_chunk *sctp_make_shutdown_complete(const struct sctp_association *,
const struct sctp_chunk *);
void sctp_init_cause(struct sctp_chunk *, __be16 cause, size_t);
struct sctp_chunk *sctp_make_abort(const struct sctp_association *,
const struct sctp_chunk *,
const size_t hint);
struct sctp_chunk *sctp_make_abort_no_data(const struct sctp_association *,
const struct sctp_chunk *,
__u32 tsn);
struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *,
const struct msghdr *, size_t msg_len);
struct sctp_chunk *sctp_make_abort_violation(const struct sctp_association *,
const struct sctp_chunk *,
const __u8 *,
const size_t );
struct sctp_chunk *sctp_make_violation_paramlen(const struct sctp_association *,
const struct sctp_chunk *,
struct sctp_paramhdr *);
struct sctp_chunk *sctp_make_violation_max_retrans(const struct sctp_association *,
const struct sctp_chunk *);
struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *,
const struct sctp_transport *);
struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *,
const struct sctp_chunk *,
const void *payload,
const size_t paylen);
struct sctp_chunk *sctp_make_op_error(const struct sctp_association *,
const struct sctp_chunk *chunk,
__be16 cause_code,
const void *payload,
size_t paylen,
size_t reserve_tail);
struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *,
union sctp_addr *,
struct sockaddr *,
int, __be16);
struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
union sctp_addr *addr);
bool sctp_verify_asconf(const struct sctp_association *asoc,
struct sctp_chunk *chunk, bool addr_param_needed,
struct sctp_paramhdr **errp);
struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
struct sctp_chunk *asconf);
int sctp_process_asconf_ack(struct sctp_association *asoc,
struct sctp_chunk *asconf_ack);
struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
__u32 new_cum_tsn, size_t nstreams,
struct sctp_fwdtsn_skip *skiplist);
struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc);
void sctp_chunk_assign_tsn(struct sctp_chunk *);
void sctp_chunk_assign_ssn(struct sctp_chunk *);
/* Prototypes for statetable processing. */
int sctp_do_sm(struct net *net, sctp_event_t event_type, sctp_subtype_t subtype,
sctp_state_t state,
struct sctp_endpoint *,
struct sctp_association *asoc,
void *event_arg,
gfp_t gfp);
/* 2nd level prototypes */
void sctp_generate_t3_rtx_event(unsigned long peer);
void sctp_generate_heartbeat_event(unsigned long peer);
void sctp_generate_proto_unreach_event(unsigned long peer);
void sctp_ootb_pkt_free(struct sctp_packet *);
struct sctp_association *sctp_unpack_cookie(const struct sctp_endpoint *,
const struct sctp_association *,
struct sctp_chunk *,
gfp_t gfp, int *err,
struct sctp_chunk **err_chk_p);
int sctp_addip_addr_config(struct sctp_association *, sctp_param_t,
struct sockaddr_storage*, int);
/* 3rd level prototypes */
__u32 sctp_generate_tag(const struct sctp_endpoint *);
__u32 sctp_generate_tsn(const struct sctp_endpoint *);
/* Extern declarations for major data structures. */
extern sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES];
/* Get the size of a DATA chunk payload. */
static inline __u16 sctp_data_size(struct sctp_chunk *chunk)
{
__u16 size;
size = ntohs(chunk->chunk_hdr->length);
size -= sizeof(sctp_data_chunk_t);
return size;
}
/* Compare two TSNs */
/* RFC 1982 - Serial Number Arithmetic
*
* 2. Comparison
* Then, s1 is said to be equal to s2 if and only if i1 is equal to i2,
* in all other cases, s1 is not equal to s2.
*
* s1 is said to be less than s2 if, and only if, s1 is not equal to s2,
* and
*
* (i1 < i2 and i2 - i1 < 2^(SERIAL_BITS - 1)) or
* (i1 > i2 and i1 - i2 > 2^(SERIAL_BITS - 1))
*
* s1 is said to be greater than s2 if, and only if, s1 is not equal to
* s2, and
*
* (i1 < i2 and i2 - i1 > 2^(SERIAL_BITS - 1)) or
* (i1 > i2 and i1 - i2 < 2^(SERIAL_BITS - 1))
*/
/*
* RFC 2960
* 1.6 Serial Number Arithmetic
*
* Comparisons and arithmetic on TSNs in this document SHOULD use Serial
* Number Arithmetic as defined in [RFC1982] where SERIAL_BITS = 32.
*/
enum {
TSN_SIGN_BIT = (1<<31)
};
static inline int TSN_lt(__u32 s, __u32 t)
{
return ((s) - (t)) & TSN_SIGN_BIT;
}
static inline int TSN_lte(__u32 s, __u32 t)
{
return ((s) == (t)) || (((s) - (t)) & TSN_SIGN_BIT);
}
/* Compare two SSNs */
/*
* RFC 2960
* 1.6 Serial Number Arithmetic
*
* Comparisons and arithmetic on Stream Sequence Numbers in this document
* SHOULD use Serial Number Arithmetic as defined in [RFC1982] where
* SERIAL_BITS = 16.
*/
enum {
SSN_SIGN_BIT = (1<<15)
};
static inline int SSN_lt(__u16 s, __u16 t)
{
return ((s) - (t)) & SSN_SIGN_BIT;
}
static inline int SSN_lte(__u16 s, __u16 t)
{
return ((s) == (t)) || (((s) - (t)) & SSN_SIGN_BIT);
}
/*
* ADDIP 3.1.1
* The valid range of Serial Number is from 0 to 4294967295 (2**32 - 1). Serial
* Numbers wrap back to 0 after reaching 4294967295.
*/
enum {
ADDIP_SERIAL_SIGN_BIT = (1<<31)
};
static inline int ADDIP_SERIAL_gte(__u16 s, __u16 t)
{
return ((s) == (t)) || (((t) - (s)) & ADDIP_SERIAL_SIGN_BIT);
}
/* Check VTAG of the packet matches the sender's own tag. */
static inline int
sctp_vtag_verify(const struct sctp_chunk *chunk,
const struct sctp_association *asoc)
{
/* RFC 2960 Sec 8.5 When receiving an SCTP packet, the endpoint
* MUST ensure that the value in the Verification Tag field of
* the received SCTP packet matches its own Tag. If the received
* Verification Tag value does not match the receiver's own
* tag value, the receiver shall silently discard the packet...
*/
if (ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag)
return 1;
return 0;
}
/* Check VTAG of the packet matches the sender's own tag and the T bit is
* not set, OR its peer's tag and the T bit is set in the Chunk Flags.
*/
static inline int
sctp_vtag_verify_either(const struct sctp_chunk *chunk,
const struct sctp_association *asoc)
{
/* RFC 2960 Section 8.5.1, sctpimpguide Section 2.41
*
* B) The receiver of a ABORT MUST accept the packet
* if the Verification Tag field of the packet matches its own tag
* and the T bit is not set
* OR
* it is set to its peer's tag and the T bit is set in the Chunk
* Flags.
* Otherwise, the receiver MUST silently discard the packet
* and take no further action.
*
* C) The receiver of a SHUTDOWN COMPLETE shall accept the packet
* if the Verification Tag field of the packet matches its own tag
* and the T bit is not set
* OR
* it is set to its peer's tag and the T bit is set in the Chunk
* Flags.
* Otherwise, the receiver MUST silently discard the packet
* and take no further action. An endpoint MUST ignore the
* SHUTDOWN COMPLETE if it is not in the SHUTDOWN-ACK-SENT state.
*/
if ((!sctp_test_T_bit(chunk) &&
(ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag)) ||
(sctp_test_T_bit(chunk) && asoc->c.peer_vtag &&
(ntohl(chunk->sctp_hdr->vtag) == asoc->c.peer_vtag))) {
return 1;
}
return 0;
}
#endif /* __sctp_sm_h__ */

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/* 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.
*
* This file is part of the SCTP kernel implementation
*
* These are the definitions needed for the tsnmap type. The tsnmap is used
* to track out of order TSNs received.
*
* 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:
* Jon Grimm <jgrimm@us.ibm.com>
* La Monte H.P. Yarroll <piggy@acm.org>
* Karl Knutson <karl@athena.chicago.il.us>
* Sridhar Samudrala <sri@us.ibm.com>
*/
#include <net/sctp/constants.h>
#ifndef __sctp_tsnmap_h__
#define __sctp_tsnmap_h__
/* RFC 2960 12.2 Parameters necessary per association (i.e. the TCB)
* Mapping An array of bits or bytes indicating which out of
* Array order TSN's have been received (relative to the
* Last Rcvd TSN). If no gaps exist, i.e. no out of
* order packets have been received, this array
* will be set to all zero. This structure may be
* in the form of a circular buffer or bit array.
*/
struct sctp_tsnmap {
/* This array counts the number of chunks with each TSN.
* It points at one of the two buffers with which we will
* ping-pong between.
*/
unsigned long *tsn_map;
/* This is the TSN at tsn_map[0]. */
__u32 base_tsn;
/* Last Rcvd : This is the last TSN received in
* TSN : sequence. This value is set initially by
* : taking the peer's Initial TSN, received in
* : the INIT or INIT ACK chunk, and subtracting
* : one from it.
*
* Throughout most of the specification this is called the
* "Cumulative TSN ACK Point". In this case, we
* ignore the advice in 12.2 in favour of the term
* used in the bulk of the text.
*/
__u32 cumulative_tsn_ack_point;
/* This is the highest TSN we've marked. */
__u32 max_tsn_seen;
/* This is the minimum number of TSNs we can track. This corresponds
* to the size of tsn_map. Note: the overflow_map allows us to
* potentially track more than this quantity.
*/
__u16 len;
/* Data chunks pending receipt. used by SCTP_STATUS sockopt */
__u16 pending_data;
/* Record duplicate TSNs here. We clear this after
* every SACK. Store up to SCTP_MAX_DUP_TSNS worth of
* information.
*/
__u16 num_dup_tsns;
__be32 dup_tsns[SCTP_MAX_DUP_TSNS];
};
struct sctp_tsnmap_iter {
__u32 start;
};
/* Initialize a block of memory as a tsnmap. */
struct sctp_tsnmap *sctp_tsnmap_init(struct sctp_tsnmap *, __u16 len,
__u32 initial_tsn, gfp_t gfp);
void sctp_tsnmap_free(struct sctp_tsnmap *map);
/* Test the tracking state of this TSN.
* Returns:
* 0 if the TSN has not yet been seen
* >0 if the TSN has been seen (duplicate)
* <0 if the TSN is invalid (too large to track)
*/
int sctp_tsnmap_check(const struct sctp_tsnmap *, __u32 tsn);
/* Mark this TSN as seen. */
int sctp_tsnmap_mark(struct sctp_tsnmap *, __u32 tsn,
struct sctp_transport *trans);
/* Mark this TSN and all lower as seen. */
void sctp_tsnmap_skip(struct sctp_tsnmap *map, __u32 tsn);
/* Retrieve the Cumulative TSN ACK Point. */
static inline __u32 sctp_tsnmap_get_ctsn(const struct sctp_tsnmap *map)
{
return map->cumulative_tsn_ack_point;
}
/* Retrieve the highest TSN we've seen. */
static inline __u32 sctp_tsnmap_get_max_tsn_seen(const struct sctp_tsnmap *map)
{
return map->max_tsn_seen;
}
/* How many duplicate TSNs are stored? */
static inline __u16 sctp_tsnmap_num_dups(struct sctp_tsnmap *map)
{
return map->num_dup_tsns;
}
/* Return pointer to duplicate tsn array as needed by SACK. */
static inline __be32 *sctp_tsnmap_get_dups(struct sctp_tsnmap *map)
{
map->num_dup_tsns = 0;
return map->dup_tsns;
}
/* How many gap ack blocks do we have recorded? */
__u16 sctp_tsnmap_num_gabs(struct sctp_tsnmap *map,
struct sctp_gap_ack_block *gabs);
/* Refresh the count on pending data. */
__u16 sctp_tsnmap_pending(struct sctp_tsnmap *map);
/* Is there a gap in the TSN map? */
static inline int sctp_tsnmap_has_gap(const struct sctp_tsnmap *map)
{
return map->cumulative_tsn_ack_point != map->max_tsn_seen;
}
/* Mark a duplicate TSN. Note: limit the storage of duplicate TSN
* information.
*/
static inline void sctp_tsnmap_mark_dup(struct sctp_tsnmap *map, __u32 tsn)
{
if (map->num_dup_tsns < SCTP_MAX_DUP_TSNS)
map->dup_tsns[map->num_dup_tsns++] = htonl(tsn);
}
/* Renege a TSN that was seen. */
void sctp_tsnmap_renege(struct sctp_tsnmap *, __u32 tsn);
/* Is there a gap in the TSN map? */
int sctp_tsnmap_has_gap(const struct sctp_tsnmap *);
#endif /* __sctp_tsnmap_h__ */

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/* 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
*
* These are the definitions needed for the sctp_ulpevent type. The
* sctp_ulpevent type is used to carry information from the state machine
* upwards to the ULP.
*
* This file is part of the SCTP kernel implementation
*
* 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:
* Jon Grimm <jgrimm@us.ibm.com>
* La Monte H.P. Yarroll <piggy@acm.org>
* Karl Knutson <karl@athena.chicago.il.us>
* Sridhar Samudrala <sri@us.ibm.com>
*/
#ifndef __sctp_ulpevent_h__
#define __sctp_ulpevent_h__
/* A structure to carry information to the ULP (e.g. Sockets API) */
/* Warning: This sits inside an skb.cb[] area. Be very careful of
* growing this structure as it is at the maximum limit now.
*/
struct sctp_ulpevent {
struct sctp_association *asoc;
__u16 stream;
__u16 ssn;
__u16 flags;
__u32 ppid;
__u32 tsn;
__u32 cumtsn;
int msg_flags;
int iif;
unsigned int rmem_len;
};
/* Retrieve the skb this event sits inside of. */
static inline struct sk_buff *sctp_event2skb(const struct sctp_ulpevent *ev)
{
return container_of((void *)ev, struct sk_buff, cb);
}
/* Retrieve & cast the event sitting inside the skb. */
static inline struct sctp_ulpevent *sctp_skb2event(struct sk_buff *skb)
{
return (struct sctp_ulpevent *)skb->cb;
}
void sctp_ulpevent_free(struct sctp_ulpevent *);
int sctp_ulpevent_is_notification(const struct sctp_ulpevent *);
unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list);
struct sctp_ulpevent *sctp_ulpevent_make_assoc_change(
const struct sctp_association *asoc,
__u16 flags,
__u16 state,
__u16 error,
__u16 outbound,
__u16 inbound,
struct sctp_chunk *chunk,
gfp_t gfp);
struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change(
const struct sctp_association *asoc,
const struct sockaddr_storage *aaddr,
int flags,
int state,
int error,
gfp_t gfp);
struct sctp_ulpevent *sctp_ulpevent_make_remote_error(
const struct sctp_association *asoc,
struct sctp_chunk *chunk,
__u16 flags,
gfp_t gfp);
struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
const struct sctp_association *asoc,
struct sctp_chunk *chunk,
__u16 flags,
__u32 error,
gfp_t gfp);
struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
const struct sctp_association *asoc,
__u16 flags,
gfp_t gfp);
struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
const struct sctp_association *asoc,
__u32 indication, gfp_t gfp);
struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
const struct sctp_association *asoc, gfp_t gfp);
struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
struct sctp_chunk *chunk,
gfp_t gfp);
struct sctp_ulpevent *sctp_ulpevent_make_authkey(
const struct sctp_association *asoc, __u16 key_id,
__u32 indication, gfp_t gfp);
struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
const struct sctp_association *asoc, gfp_t gfp);
void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
struct msghdr *);
void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,
struct msghdr *);
void sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event,
struct msghdr *, struct sock *sk);
__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event);
/* Is this event type enabled? */
static inline int sctp_ulpevent_type_enabled(__u16 sn_type,
struct sctp_event_subscribe *mask)
{
char *amask = (char *) mask;
return amask[sn_type - SCTP_SN_TYPE_BASE];
}
/* Given an event subscription, is this event enabled? */
static inline int sctp_ulpevent_is_enabled(const struct sctp_ulpevent *event,
struct sctp_event_subscribe *mask)
{
__u16 sn_type;
int enabled = 1;
if (sctp_ulpevent_is_notification(event)) {
sn_type = sctp_ulpevent_get_notification_type(event);
enabled = sctp_ulpevent_type_enabled(sn_type, mask);
}
return enabled;
}
#endif /* __sctp_ulpevent_h__ */

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/* 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
*
* These are the definitions needed for the sctp_ulpq type. The
* sctp_ulpq is the interface between the Upper Layer Protocol, or ULP,
* and the core SCTP state machine. This is the component which handles
* reassembly and ordering.
*
* 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 addresses:
* lksctp developers <linux-sctp@vger.kernel.org>
*
* Written or modified by:
* Jon Grimm <jgrimm@us.ibm.com>
* La Monte H.P. Yarroll <piggy@acm.org>
* Sridhar Samudrala <sri@us.ibm.com>
*/
#ifndef __sctp_ulpqueue_h__
#define __sctp_ulpqueue_h__
/* A structure to carry information to the ULP (e.g. Sockets API) */
struct sctp_ulpq {
char pd_mode;
struct sctp_association *asoc;
struct sk_buff_head reasm;
struct sk_buff_head lobby;
};
/* Prototypes. */
struct sctp_ulpq *sctp_ulpq_init(struct sctp_ulpq *,
struct sctp_association *);
void sctp_ulpq_flush(struct sctp_ulpq *ulpq);
void sctp_ulpq_free(struct sctp_ulpq *);
/* Add a new DATA chunk for processing. */
int sctp_ulpq_tail_data(struct sctp_ulpq *, struct sctp_chunk *, gfp_t);
/* Add a new event for propagation to the ULP. */
int sctp_ulpq_tail_event(struct sctp_ulpq *, struct sctp_ulpevent *ev);
/* Renege previously received chunks. */
void sctp_ulpq_renege(struct sctp_ulpq *, struct sctp_chunk *, gfp_t);
/* Perform partial delivery. */
void sctp_ulpq_partial_delivery(struct sctp_ulpq *, gfp_t);
/* Abort the partial delivery. */
void sctp_ulpq_abort_pd(struct sctp_ulpq *, gfp_t);
/* Clear the partial data delivery condition on this socket. */
int sctp_clear_pd(struct sock *sk, struct sctp_association *asoc);
/* Skip over an SSN. */
void sctp_ulpq_skip(struct sctp_ulpq *ulpq, __u16 sid, __u16 ssn);
void sctp_ulpq_reasm_flushtsn(struct sctp_ulpq *, __u32);
#endif /* __sctp_ulpqueue_h__ */