path: root/include/net/sctp/sctp.h

/* 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;
extern long sysctl_sctp_mem[3];
extern int sysctl_sctp_rmem[3];
extern int sysctl_sctp_wmem[3];

/*
 *  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<