forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
2183 lines
66 KiB
2183 lines
66 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
|
/* 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 |
|
* |
|
* Please send any bug reports or fixes you make to the |
|
* email addresses: |
|
* lksctp developers <[email protected]> |
|
* |
|
* Written or modified by: |
|
* Randall Stewart <[email protected]> |
|
* Ken Morneau <[email protected]> |
|
* Qiaobing Xie <[email protected]> |
|
* La Monte H.P. Yarroll <[email protected]> |
|
* Karl Knutson <[email protected]> |
|
* Jon Grimm <[email protected]> |
|
* Xingang Guo <[email protected]> |
|
* Hui Huang <[email protected]> |
|
* Sridhar Samudrala <[email protected]> |
|
* Daisy Chang <[email protected]> |
|
* Dajiang Zhang <[email protected]> |
|
* Ardelle Fan <[email protected]> |
|
* Ryan Layer <[email protected]> |
|
* Anup Pemmaiah <[email protected]> |
|
* Kevin Gao <[email protected]> |
|
*/ |
|
|
|
#ifndef __sctp_structs_h__ |
|
#define __sctp_structs_h__ |
|
|
|
#include <linux/ktime.h> |
|
#include <linux/generic-radix-tree.h> |
|
#include <linux/rhashtable-types.h> |
|
#include <linux/socket.h> /* linux/in.h needs this!! */ |
|
#include <linux/in.h> /* We get struct sockaddr_in. */ |
|
#include <linux/in6.h> /* We get struct in6_addr */ |
|
#include <linux/ipv6.h> |
|
#include <asm/param.h> /* We get MAXHOSTNAMELEN. */ |
|
#include <linux/atomic.h> /* This gets us atomic counters. */ |
|
#include <linux/skbuff.h> /* We need sk_buff_head. */ |
|
#include <linux/workqueue.h> /* We need tq_struct. */ |
|
#include <linux/sctp.h> /* We need sctp* header structs. */ |
|
#include <net/sctp/auth.h> /* We need auth specific structs */ |
|
#include <net/ip.h> /* For inet_skb_parm */ |
|
|
|
/* A convenience structure for handling sockaddr structures. |
|
* We should wean ourselves off this. |
|
*/ |
|
union sctp_addr { |
|
struct sockaddr_in v4; |
|
struct sockaddr_in6 v6; |
|
struct sockaddr sa; |
|
}; |
|
|
|
/* Forward declarations for data structures. */ |
|
struct sctp_globals; |
|
struct sctp_endpoint; |
|
struct sctp_association; |
|
struct sctp_transport; |
|
struct sctp_packet; |
|
struct sctp_chunk; |
|
struct sctp_inq; |
|
struct sctp_outq; |
|
struct sctp_bind_addr; |
|
struct sctp_ulpq; |
|
struct sctp_ep_common; |
|
struct crypto_shash; |
|
struct sctp_stream; |
|
|
|
|
|
#include <net/sctp/tsnmap.h> |
|
#include <net/sctp/ulpevent.h> |
|
#include <net/sctp/ulpqueue.h> |
|
#include <net/sctp/stream_interleave.h> |
|
|
|
/* Structures useful for managing bind/connect. */ |
|
|
|
struct sctp_bind_bucket { |
|
unsigned short port; |
|
signed char fastreuse; |
|
signed char fastreuseport; |
|
kuid_t fastuid; |
|
struct hlist_node node; |
|
struct hlist_head owner; |
|
struct net *net; |
|
}; |
|
|
|
struct sctp_bind_hashbucket { |
|
spinlock_t lock; |
|
struct hlist_head chain; |
|
}; |
|
|
|
/* Used for hashing all associations. */ |
|
struct sctp_hashbucket { |
|
rwlock_t lock; |
|
struct hlist_head chain; |
|
} __attribute__((__aligned__(8))); |
|
|
|
|
|
/* The SCTP globals structure. */ |
|
extern struct sctp_globals { |
|
/* This is a list of groups of functions for each address |
|
* family that we support. |
|
*/ |
|
struct list_head address_families; |
|
|
|
/* This is the hash of all endpoints. */ |
|
struct sctp_hashbucket *ep_hashtable; |
|
/* This is the sctp port control hash. */ |
|
struct sctp_bind_hashbucket *port_hashtable; |
|
/* This is the hash of all transports. */ |
|
struct rhltable transport_hashtable; |
|
|
|
/* Sizes of above hashtables. */ |
|
int ep_hashsize; |
|
int port_hashsize; |
|
|
|
/* Default initialization values to be applied to new associations. */ |
|
__u16 max_instreams; |
|
__u16 max_outstreams; |
|
|
|
/* Flag to indicate whether computing and verifying checksum |
|
* is disabled. */ |
|
bool checksum_disable; |
|
} sctp_globals; |
|
|
|
#define sctp_max_instreams (sctp_globals.max_instreams) |
|
#define sctp_max_outstreams (sctp_globals.max_outstreams) |
|
#define sctp_address_families (sctp_globals.address_families) |
|
#define sctp_ep_hashsize (sctp_globals.ep_hashsize) |
|
#define sctp_ep_hashtable (sctp_globals.ep_hashtable) |
|
#define sctp_port_hashsize (sctp_globals.port_hashsize) |
|
#define sctp_port_hashtable (sctp_globals.port_hashtable) |
|
#define sctp_transport_hashtable (sctp_globals.transport_hashtable) |
|
#define sctp_checksum_disable (sctp_globals.checksum_disable) |
|
|
|
/* SCTP Socket type: UDP or TCP style. */ |
|
enum sctp_socket_type { |
|
SCTP_SOCKET_UDP = 0, |
|
SCTP_SOCKET_UDP_HIGH_BANDWIDTH, |
|
SCTP_SOCKET_TCP |
|
}; |
|
|
|
/* Per socket SCTP information. */ |
|
struct sctp_sock { |
|
/* inet_sock has to be the first member of sctp_sock */ |
|
struct inet_sock inet; |
|
/* What kind of a socket is this? */ |
|
enum sctp_socket_type type; |
|
|
|
/* PF_ family specific functions. */ |
|
struct sctp_pf *pf; |
|
|
|
/* Access to HMAC transform. */ |
|
struct crypto_shash *hmac; |
|
char *sctp_hmac_alg; |
|
|
|
/* What is our base endpointer? */ |
|
struct sctp_endpoint *ep; |
|
|
|
struct sctp_bind_bucket *bind_hash; |
|
/* Various Socket Options. */ |
|
__u16 default_stream; |
|
__u32 default_ppid; |
|
__u16 default_flags; |
|
__u32 default_context; |
|
__u32 default_timetolive; |
|
__u32 default_rcv_context; |
|
int max_burst; |
|
|
|
/* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
|
* the destination address every heartbeat interval. This value |
|
* will be inherited by all new associations. |
|
*/ |
|
__u32 hbinterval; |
|
|
|
__be16 udp_port; |
|
__be16 encap_port; |
|
|
|
/* This is the max_retrans value for new associations. */ |
|
__u16 pathmaxrxt; |
|
|
|
__u32 flowlabel; |
|
__u8 dscp; |
|
|
|
__u16 pf_retrans; |
|
__u16 ps_retrans; |
|
|
|
/* The initial Path MTU to use for new associations. */ |
|
__u32 pathmtu; |
|
|
|
/* The default SACK delay timeout for new associations. */ |
|
__u32 sackdelay; |
|
__u32 sackfreq; |
|
|
|
/* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ |
|
__u32 param_flags; |
|
|
|
__u32 default_ss; |
|
|
|
struct sctp_rtoinfo rtoinfo; |
|
struct sctp_paddrparams paddrparam; |
|
struct sctp_assocparams assocparams; |
|
|
|
/* |
|
* These two structures must be grouped together for the usercopy |
|
* whitelist region. |
|
*/ |
|
__u16 subscribe; |
|
struct sctp_initmsg initmsg; |
|
|
|
int user_frag; |
|
|
|
__u32 autoclose; |
|
__u32 adaptation_ind; |
|
__u32 pd_point; |
|
__u16 nodelay:1, |
|
pf_expose:2, |
|
reuse:1, |
|
disable_fragments:1, |
|
v4mapped:1, |
|
frag_interleave:1, |
|
recvrcvinfo:1, |
|
recvnxtinfo:1, |
|
data_ready_signalled:1; |
|
|
|
atomic_t pd_mode; |
|
|
|
/* Fields after this point will be skipped on copies, like on accept |
|
* and peeloff operations |
|
*/ |
|
|
|
/* Receive to here while partial delivery is in effect. */ |
|
struct sk_buff_head pd_lobby; |
|
|
|
struct list_head auto_asconf_list; |
|
int do_auto_asconf; |
|
}; |
|
|
|
static inline struct sctp_sock *sctp_sk(const struct sock *sk) |
|
{ |
|
return (struct sctp_sock *)sk; |
|
} |
|
|
|
static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) |
|
{ |
|
return (struct sock *)sp; |
|
} |
|
|
|
#if IS_ENABLED(CONFIG_IPV6) |
|
struct sctp6_sock { |
|
struct sctp_sock sctp; |
|
struct ipv6_pinfo inet6; |
|
}; |
|
#endif /* CONFIG_IPV6 */ |
|
|
|
|
|
/* This is our APPLICATION-SPECIFIC state cookie. |
|
* THIS IS NOT DICTATED BY THE SPECIFICATION. |
|
*/ |
|
/* These are the parts of an association which we send in the cookie. |
|
* Most of these are straight out of: |
|
* RFC2960 12.2 Parameters necessary per association (i.e. the TCB) |
|
* |
|
*/ |
|
|
|
struct sctp_cookie { |
|
|
|
/* My : Tag expected in every inbound packet and sent |
|
* Verification: in the INIT or INIT ACK chunk. |
|
* Tag : |
|
*/ |
|
__u32 my_vtag; |
|
|
|
/* Peer's : Tag expected in every outbound packet except |
|
* Verification: in the INIT chunk. |
|
* Tag : |
|
*/ |
|
__u32 peer_vtag; |
|
|
|
/* The rest of these are not from the spec, but really need to |
|
* be in the cookie. |
|
*/ |
|
|
|
/* My Tie Tag : Assist in discovering a restarting association. */ |
|
__u32 my_ttag; |
|
|
|
/* Peer's Tie Tag: Assist in discovering a restarting association. */ |
|
__u32 peer_ttag; |
|
|
|
/* When does this cookie expire? */ |
|
ktime_t expiration; |
|
|
|
/* Number of inbound/outbound streams which are set |
|
* and negotiated during the INIT process. |
|
*/ |
|
__u16 sinit_num_ostreams; |
|
__u16 sinit_max_instreams; |
|
|
|
/* This is the first sequence number I used. */ |
|
__u32 initial_tsn; |
|
|
|
/* This holds the originating address of the INIT packet. */ |
|
union sctp_addr peer_addr; |
|
|
|
/* IG Section 2.35.3 |
|
* Include the source port of the INIT-ACK |
|
*/ |
|
__u16 my_port; |
|
|
|
__u8 prsctp_capable; |
|
|
|
/* Padding for future use */ |
|
__u8 padding; |
|
|
|
__u32 adaptation_ind; |
|
|
|
__u8 auth_random[sizeof(struct sctp_paramhdr) + |
|
SCTP_AUTH_RANDOM_LENGTH]; |
|
__u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; |
|
__u8 auth_chunks[sizeof(struct sctp_paramhdr) + SCTP_AUTH_MAX_CHUNKS]; |
|
|
|
/* This is a shim for my peer's INIT packet, followed by |
|
* a copy of the raw address list of the association. |
|
* The length of the raw address list is saved in the |
|
* raw_addr_list_len field, which will be used at the time when |
|
* the association TCB is re-constructed from the cookie. |
|
*/ |
|
__u32 raw_addr_list_len; |
|
struct sctp_init_chunk peer_init[]; |
|
}; |
|
|
|
|
|
/* The format of our cookie that we send to our peer. */ |
|
struct sctp_signed_cookie { |
|
__u8 signature[SCTP_SECRET_SIZE]; |
|
__u32 __pad; /* force sctp_cookie alignment to 64 bits */ |
|
struct sctp_cookie c; |
|
} __packed; |
|
|
|
/* This is another convenience type to allocate memory for address |
|
* params for the maximum size and pass such structures around |
|
* internally. |
|
*/ |
|
union sctp_addr_param { |
|
struct sctp_paramhdr p; |
|
struct sctp_ipv4addr_param v4; |
|
struct sctp_ipv6addr_param v6; |
|
}; |
|
|
|
/* A convenience type to allow walking through the various |
|
* parameters and avoid casting all over the place. |
|
*/ |
|
union sctp_params { |
|
void *v; |
|
struct sctp_paramhdr *p; |
|
struct sctp_cookie_preserve_param *life; |
|
struct sctp_hostname_param *dns; |
|
struct sctp_cookie_param *cookie; |
|
struct sctp_supported_addrs_param *sat; |
|
struct sctp_ipv4addr_param *v4; |
|
struct sctp_ipv6addr_param *v6; |
|
union sctp_addr_param *addr; |
|
struct sctp_adaptation_ind_param *aind; |
|
struct sctp_supported_ext_param *ext; |
|
struct sctp_random_param *random; |
|
struct sctp_chunks_param *chunks; |
|
struct sctp_hmac_algo_param *hmac_algo; |
|
struct sctp_addip_param *addip; |
|
}; |
|
|
|
/* RFC 2960. Section 3.3.5 Heartbeat. |
|
* Heartbeat Information: variable length |
|
* The Sender-specific Heartbeat Info field should normally include |
|
* information about the sender's current time when this HEARTBEAT |
|
* chunk is sent and the destination transport address to which this |
|
* HEARTBEAT is sent (see Section 8.3). |
|
*/ |
|
struct sctp_sender_hb_info { |
|
struct sctp_paramhdr param_hdr; |
|
union sctp_addr daddr; |
|
unsigned long sent_at; |
|
__u64 hb_nonce; |
|
}; |
|
|
|
int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt, |
|
gfp_t gfp); |
|
int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid); |
|
void sctp_stream_free(struct sctp_stream *stream); |
|
void sctp_stream_clear(struct sctp_stream *stream); |
|
void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new); |
|
|
|
/* What is the current SSN number for this stream? */ |
|
#define sctp_ssn_peek(stream, type, sid) \ |
|
(sctp_stream_##type((stream), (sid))->ssn) |
|
|
|
/* Return the next SSN number for this stream. */ |
|
#define sctp_ssn_next(stream, type, sid) \ |
|
(sctp_stream_##type((stream), (sid))->ssn++) |
|
|
|
/* Skip over this ssn and all below. */ |
|
#define sctp_ssn_skip(stream, type, sid, ssn) \ |
|
(sctp_stream_##type((stream), (sid))->ssn = ssn + 1) |
|
|
|
/* What is the current MID number for this stream? */ |
|
#define sctp_mid_peek(stream, type, sid) \ |
|
(sctp_stream_##type((stream), (sid))->mid) |
|
|
|
/* Return the next MID number for this stream. */ |
|
#define sctp_mid_next(stream, type, sid) \ |
|
(sctp_stream_##type((stream), (sid))->mid++) |
|
|
|
/* Skip over this mid and all below. */ |
|
#define sctp_mid_skip(stream, type, sid, mid) \ |
|
(sctp_stream_##type((stream), (sid))->mid = mid + 1) |
|
|
|
/* What is the current MID_uo number for this stream? */ |
|
#define sctp_mid_uo_peek(stream, type, sid) \ |
|
(sctp_stream_##type((stream), (sid))->mid_uo) |
|
|
|
/* Return the next MID_uo number for this stream. */ |
|
#define sctp_mid_uo_next(stream, type, sid) \ |
|
(sctp_stream_##type((stream), (sid))->mid_uo++) |
|
|
|
/* |
|
* Pointers to address related SCTP functions. |
|
* (i.e. things that depend on the address family.) |
|
*/ |
|
struct sctp_af { |
|
int (*sctp_xmit) (struct sk_buff *skb, |
|
struct sctp_transport *); |
|
int (*setsockopt) (struct sock *sk, |
|
int level, |
|
int optname, |
|
sockptr_t optval, |
|
unsigned int optlen); |
|
int (*getsockopt) (struct sock *sk, |
|
int level, |
|
int optname, |
|
char __user *optval, |
|
int __user *optlen); |
|
void (*get_dst) (struct sctp_transport *t, |
|
union sctp_addr *saddr, |
|
struct flowi *fl, |
|
struct sock *sk); |
|
void (*get_saddr) (struct sctp_sock *sk, |
|
struct sctp_transport *t, |
|
struct flowi *fl); |
|
void (*copy_addrlist) (struct list_head *, |
|
struct net_device *); |
|
int (*cmp_addr) (const union sctp_addr *addr1, |
|
const union sctp_addr *addr2); |
|
void (*addr_copy) (union sctp_addr *dst, |
|
union sctp_addr *src); |
|
void (*from_skb) (union sctp_addr *, |
|
struct sk_buff *skb, |
|
int saddr); |
|
void (*from_sk) (union sctp_addr *, |
|
struct sock *sk); |
|
void (*from_addr_param) (union sctp_addr *, |
|
union sctp_addr_param *, |
|
__be16 port, int iif); |
|
int (*to_addr_param) (const union sctp_addr *, |
|
union sctp_addr_param *); |
|
int (*addr_valid) (union sctp_addr *, |
|
struct sctp_sock *, |
|
const struct sk_buff *); |
|
enum sctp_scope (*scope)(union sctp_addr *); |
|
void (*inaddr_any) (union sctp_addr *, __be16); |
|
int (*is_any) (const union sctp_addr *); |
|
int (*available) (union sctp_addr *, |
|
struct sctp_sock *); |
|
int (*skb_iif) (const struct sk_buff *sk); |
|
int (*is_ce) (const struct sk_buff *sk); |
|
void (*seq_dump_addr)(struct seq_file *seq, |
|
union sctp_addr *addr); |
|
void (*ecn_capable)(struct sock *sk); |
|
__u16 net_header_len; |
|
int sockaddr_len; |
|
int (*ip_options_len)(struct sock *sk); |
|
sa_family_t sa_family; |
|
struct list_head list; |
|
}; |
|
|
|
struct sctp_af *sctp_get_af_specific(sa_family_t); |
|
int sctp_register_af(struct sctp_af *); |
|
|
|
/* Protocol family functions. */ |
|
struct sctp_pf { |
|
void (*event_msgname)(struct sctp_ulpevent *, char *, int *); |
|
void (*skb_msgname) (struct sk_buff *, char *, int *); |
|
int (*af_supported) (sa_family_t, struct sctp_sock *); |
|
int (*cmp_addr) (const union sctp_addr *, |
|
const union sctp_addr *, |
|
struct sctp_sock *); |
|
int (*bind_verify) (struct sctp_sock *, union sctp_addr *); |
|
int (*send_verify) (struct sctp_sock *, union sctp_addr *); |
|
int (*supported_addrs)(const struct sctp_sock *, __be16 *); |
|
struct sock *(*create_accept_sk) (struct sock *sk, |
|
struct sctp_association *asoc, |
|
bool kern); |
|
int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); |
|
void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); |
|
void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); |
|
void (*copy_ip_options)(struct sock *sk, struct sock *newsk); |
|
struct sctp_af *af; |
|
}; |
|
|
|
|
|
/* Structure to track chunk fragments that have been acked, but peer |
|
* fragments of the same message have not. |
|
*/ |
|
struct sctp_datamsg { |
|
/* Chunks waiting to be submitted to lower layer. */ |
|
struct list_head chunks; |
|
/* Reference counting. */ |
|
refcount_t refcnt; |
|
/* When is this message no longer interesting to the peer? */ |
|
unsigned long expires_at; |
|
/* Did the messenge fail to send? */ |
|
int send_error; |
|
u8 send_failed:1, |
|
can_delay:1, /* should this message be Nagle delayed */ |
|
abandoned:1; /* should this message be abandoned */ |
|
}; |
|
|
|
struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, |
|
struct sctp_sndrcvinfo *, |
|
struct iov_iter *); |
|
void sctp_datamsg_free(struct sctp_datamsg *); |
|
void sctp_datamsg_put(struct sctp_datamsg *); |
|
void sctp_chunk_fail(struct sctp_chunk *, int error); |
|
int sctp_chunk_abandoned(struct sctp_chunk *); |
|
|
|
/* RFC2960 1.4 Key Terms |
|
* |
|
* o Chunk: A unit of information within an SCTP packet, consisting of |
|
* a chunk header and chunk-specific content. |
|
* |
|
* As a matter of convenience, we remember the SCTP common header for |
|
* each chunk as well as a few other header pointers... |
|
*/ |
|
struct sctp_chunk { |
|
struct list_head list; |
|
|
|
refcount_t refcnt; |
|
|
|
/* How many times this chunk have been sent, for prsctp RTX policy */ |
|
int sent_count; |
|
|
|
union { |
|
/* This is our link to the per-transport transmitted list. */ |
|
struct list_head transmitted_list; |
|
/* List in specific stream outq */ |
|
struct list_head stream_list; |
|
}; |
|
|
|
/* This field is used by chunks that hold fragmented data. |
|
* For the first fragment this is the list that holds the rest of |
|
* fragments. For the remaining fragments, this is the link to the |
|
* frag_list maintained in the first fragment. |
|
*/ |
|
struct list_head frag_list; |
|
|
|
/* This points to the sk_buff containing the actual data. */ |
|
struct sk_buff *skb; |
|
|
|
union { |
|
/* In case of GSO packets, this will store the head one */ |
|
struct sk_buff *head_skb; |
|
/* In case of auth enabled, this will point to the shkey */ |
|
struct sctp_shared_key *shkey; |
|
}; |
|
|
|
/* These are the SCTP headers by reverse order in a packet. |
|
* Note that some of these may happen more than once. In that |
|
* case, we point at the "current" one, whatever that means |
|
* for that level of header. |
|
*/ |
|
|
|
/* We point this at the FIRST TLV parameter to chunk_hdr. */ |
|
union sctp_params param_hdr; |
|
union { |
|
__u8 *v; |
|
struct sctp_datahdr *data_hdr; |
|
struct sctp_inithdr *init_hdr; |
|
struct sctp_sackhdr *sack_hdr; |
|
struct sctp_heartbeathdr *hb_hdr; |
|
struct sctp_sender_hb_info *hbs_hdr; |
|
struct sctp_shutdownhdr *shutdown_hdr; |
|
struct sctp_signed_cookie *cookie_hdr; |
|
struct sctp_ecnehdr *ecne_hdr; |
|
struct sctp_cwrhdr *ecn_cwr_hdr; |
|
struct sctp_errhdr *err_hdr; |
|
struct sctp_addiphdr *addip_hdr; |
|
struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
|
struct sctp_authhdr *auth_hdr; |
|
struct sctp_idatahdr *idata_hdr; |
|
struct sctp_ifwdtsn_hdr *ifwdtsn_hdr; |
|
} subh; |
|
|
|
__u8 *chunk_end; |
|
|
|
struct sctp_chunkhdr *chunk_hdr; |
|
struct sctphdr *sctp_hdr; |
|
|
|
/* This needs to be recoverable for SCTP_SEND_FAILED events. */ |
|
struct sctp_sndrcvinfo sinfo; |
|
|
|
/* Which association does this belong to? */ |
|
struct sctp_association *asoc; |
|
|
|
/* What endpoint received this chunk? */ |
|
struct sctp_ep_common *rcvr; |
|
|
|
/* We fill this in if we are calculating RTT. */ |
|
unsigned long sent_at; |
|
|
|
/* What is the origin IP address for this chunk? */ |
|
union sctp_addr source; |
|
/* Destination address for this chunk. */ |
|
union sctp_addr dest; |
|
|
|
/* For outbound message, track all fragments for SEND_FAILED. */ |
|
struct sctp_datamsg *msg; |
|
|
|
/* For an inbound chunk, this tells us where it came from. |
|
* For an outbound chunk, it tells us where we'd like it to |
|
* go. It is NULL if we have no preference. |
|
*/ |
|
struct sctp_transport *transport; |
|
|
|
/* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO |
|
* we need save a pointer to the AUTH chunk, since the SCTP-AUTH |
|
* spec violates the principle premis that all chunks are processed |
|
* in order. |
|
*/ |
|
struct sk_buff *auth_chunk; |
|
|
|
#define SCTP_CAN_FRTX 0x0 |
|
#define SCTP_NEED_FRTX 0x1 |
|
#define SCTP_DONT_FRTX 0x2 |
|
__u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ |
|
has_tsn:1, /* Does this chunk have a TSN yet? */ |
|
has_ssn:1, /* Does this chunk have a SSN yet? */ |
|
#define has_mid has_ssn |
|
singleton:1, /* Only chunk in the packet? */ |
|
end_of_packet:1, /* Last chunk in the packet? */ |
|
ecn_ce_done:1, /* Have we processed the ECN CE bit? */ |
|
pdiscard:1, /* Discard the whole packet now? */ |
|
tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ |
|
data_accepted:1, /* At least 1 chunk accepted */ |
|
auth:1, /* IN: was auth'ed | OUT: needs auth */ |
|
has_asconf:1, /* IN: have seen an asconf before */ |
|
tsn_missing_report:2, /* Data chunk missing counter. */ |
|
fast_retransmit:2; /* Is this chunk fast retransmitted? */ |
|
}; |
|
|
|
#define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1) |
|
void sctp_chunk_hold(struct sctp_chunk *); |
|
void sctp_chunk_put(struct sctp_chunk *); |
|
int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, |
|
struct iov_iter *from); |
|
void sctp_chunk_free(struct sctp_chunk *); |
|
void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); |
|
struct sctp_chunk *sctp_chunkify(struct sk_buff *, |
|
const struct sctp_association *, |
|
struct sock *, gfp_t gfp); |
|
void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, |
|
union sctp_addr *); |
|
const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); |
|
|
|
static inline __u16 sctp_chunk_stream_no(struct sctp_chunk *ch) |
|
{ |
|
return ntohs(ch->subh.data_hdr->stream); |
|
} |
|
|
|
enum { |
|
SCTP_ADDR_NEW, /* new address added to assoc/ep */ |
|
SCTP_ADDR_SRC, /* address can be used as source */ |
|
SCTP_ADDR_DEL, /* address about to be deleted */ |
|
}; |
|
|
|
/* This is a structure for holding either an IPv6 or an IPv4 address. */ |
|
struct sctp_sockaddr_entry { |
|
struct list_head list; |
|
struct rcu_head rcu; |
|
union sctp_addr a; |
|
__u8 state; |
|
__u8 valid; |
|
}; |
|
|
|
#define SCTP_ADDRESS_TICK_DELAY 500 |
|
|
|
/* This structure holds lists of chunks as we are assembling for |
|
* transmission. |
|
*/ |
|
struct sctp_packet { |
|
/* These are the SCTP header values (host order) for the packet. */ |
|
__u16 source_port; |
|
__u16 destination_port; |
|
__u32 vtag; |
|
|
|
/* This contains the payload chunks. */ |
|
struct list_head chunk_list; |
|
|
|
/* This is the overhead of the sctp and ip headers. */ |
|
size_t overhead; |
|
/* This is the total size of all chunks INCLUDING padding. */ |
|
size_t size; |
|
/* This is the maximum size this packet may have */ |
|
size_t max_size; |
|
|
|
/* The packet is destined for this transport address. |
|
* The function we finally use to pass down to the next lower |
|
* layer lives in the transport structure. |
|
*/ |
|
struct sctp_transport *transport; |
|
|
|
/* pointer to the auth chunk for this packet */ |
|
struct sctp_chunk *auth; |
|
|
|
u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ |
|
has_sack:1, /* This packet contains a SACK chunk. */ |
|
has_auth:1, /* This packet contains an AUTH chunk */ |
|
has_data:1, /* This packet contains at least 1 DATA chunk */ |
|
ipfragok:1; /* So let ip fragment this packet */ |
|
}; |
|
|
|
void sctp_packet_init(struct sctp_packet *, struct sctp_transport *, |
|
__u16 sport, __u16 dport); |
|
void sctp_packet_config(struct sctp_packet *, __u32 vtag, int); |
|
enum sctp_xmit sctp_packet_transmit_chunk(struct sctp_packet *packet, |
|
struct sctp_chunk *chunk, |
|
int one_packet, gfp_t gfp); |
|
enum sctp_xmit sctp_packet_append_chunk(struct sctp_packet *packet, |
|
struct sctp_chunk *chunk); |
|
int sctp_packet_transmit(struct sctp_packet *, gfp_t); |
|
void sctp_packet_free(struct sctp_packet *); |
|
|
|
static inline int sctp_packet_empty(struct sctp_packet *packet) |
|
{ |
|
return packet->size == packet->overhead; |
|
} |
|
|
|
/* This represents a remote transport address. |
|
* For local transport addresses, we just use union sctp_addr. |
|
* |
|
* RFC2960 Section 1.4 Key Terms |
|
* |
|
* o Transport address: A Transport Address is traditionally defined |
|
* by Network Layer address, Transport Layer protocol and Transport |
|
* Layer port number. In the case of SCTP running over IP, a |
|
* transport address is defined by the combination of an IP address |
|
* and an SCTP port number (where SCTP is the Transport protocol). |
|
* |
|
* RFC2960 Section 7.1 SCTP Differences from TCP Congestion control |
|
* |
|
* o The sender keeps a separate congestion control parameter set for |
|
* each of the destination addresses it can send to (not each |
|
* source-destination pair but for each destination). The parameters |
|
* should decay if the address is not used for a long enough time |
|
* period. |
|
* |
|
*/ |
|
struct sctp_transport { |
|
/* A list of transports. */ |
|
struct list_head transports; |
|
struct rhlist_head node; |
|
|
|
/* Reference counting. */ |
|
refcount_t refcnt; |
|
/* RTO-Pending : A flag used to track if one of the DATA |
|
* chunks sent to this address is currently being |
|
* used to compute a RTT. If this flag is 0, |
|
* the next DATA chunk sent to this destination |
|
* should be used to compute a RTT and this flag |
|
* should be set. Every time the RTT |
|
* calculation completes (i.e. the DATA chunk |
|
* is SACK'd) clear this flag. |
|
*/ |
|
__u32 rto_pending:1, |
|
|
|
/* |
|
* hb_sent : a flag that signals that we have a pending |
|
* heartbeat. |
|
*/ |
|
hb_sent:1, |
|
|
|
/* Is the Path MTU update pending on this tranport */ |
|
pmtu_pending:1, |
|
|
|
dst_pending_confirm:1, /* need to confirm neighbour */ |
|
|
|
/* Has this transport moved the ctsn since we last sacked */ |
|
sack_generation:1; |
|
u32 dst_cookie; |
|
|
|
struct flowi fl; |
|
|
|
/* This is the peer's IP address and port. */ |
|
union sctp_addr ipaddr; |
|
|
|
/* These are the functions we call to handle LLP stuff. */ |
|
struct sctp_af *af_specific; |
|
|
|
/* Which association do we belong to? */ |
|
struct sctp_association *asoc; |
|
|
|
/* RFC2960 |
|
* |
|
* 12.3 Per Transport Address Data |
|
* |
|
* For each destination transport address in the peer's |
|
* address list derived from the INIT or INIT ACK chunk, a |
|
* number of data elements needs to be maintained including: |
|
*/ |
|
/* RTO : The current retransmission timeout value. */ |
|
unsigned long rto; |
|
|
|
__u32 rtt; /* This is the most recent RTT. */ |
|
|
|
/* RTTVAR : The current RTT variation. */ |
|
__u32 rttvar; |
|
|
|
/* SRTT : The current smoothed round trip time. */ |
|
__u32 srtt; |
|
|
|
/* |
|
* These are the congestion stats. |
|
*/ |
|
/* cwnd : The current congestion window. */ |
|
__u32 cwnd; /* This is the actual cwnd. */ |
|
|
|
/* ssthresh : The current slow start threshold value. */ |
|
__u32 ssthresh; |
|
|
|
/* partial : The tracking method for increase of cwnd when in |
|
* bytes acked : congestion avoidance mode (see Section 6.2.2) |
|
*/ |
|
__u32 partial_bytes_acked; |
|
|
|
/* Data that has been sent, but not acknowledged. */ |
|
__u32 flight_size; |
|
|
|
__u32 burst_limited; /* Holds old cwnd when max.burst is applied */ |
|
|
|
/* Destination */ |
|
struct dst_entry *dst; |
|
/* Source address. */ |
|
union sctp_addr saddr; |
|
|
|
/* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
|
* the destination address every heartbeat interval. |
|
*/ |
|
unsigned long hbinterval; |
|
|
|
/* SACK delay timeout */ |
|
unsigned long sackdelay; |
|
__u32 sackfreq; |
|
|
|
atomic_t mtu_info; |
|
|
|
/* When was the last time that we heard from this transport? We use |
|
* this to pick new active and retran paths. |
|
*/ |
|
ktime_t last_time_heard; |
|
|
|
/* When was the last time that we sent a chunk using this |
|
* transport? We use this to check for idle transports |
|
*/ |
|
unsigned long last_time_sent; |
|
|
|
/* Last time(in jiffies) when cwnd is reduced due to the congestion |
|
* indication based on ECNE chunk. |
|
*/ |
|
unsigned long last_time_ecne_reduced; |
|
|
|
__be16 encap_port; |
|
|
|
/* This is the max_retrans value for the transport and will |
|
* be initialized from the assocs value. This can be changed |
|
* using the SCTP_SET_PEER_ADDR_PARAMS socket option. |
|
*/ |
|
__u16 pathmaxrxt; |
|
|
|
__u32 flowlabel; |
|
__u8 dscp; |
|
|
|
/* This is the partially failed retrans value for the transport |
|
* and will be initialized from the assocs value. This can be changed |
|
* using the SCTP_PEER_ADDR_THLDS socket option |
|
*/ |
|
__u16 pf_retrans; |
|
/* Used for primary path switchover. */ |
|
__u16 ps_retrans; |
|
/* PMTU : The current known path MTU. */ |
|
__u32 pathmtu; |
|
|
|
/* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ |
|
__u32 param_flags; |
|
|
|
/* The number of times INIT has been sent on this transport. */ |
|
int init_sent_count; |
|
|
|
/* state : The current state of this destination, |
|
* : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. |
|
*/ |
|
int state; |
|
|
|
/* These are the error stats for this destination. */ |
|
|
|
/* Error count : The current error count for this destination. */ |
|
unsigned short error_count; |
|
|
|
/* Per : A timer used by each destination. |
|
* Destination : |
|
* Timer : |
|
* |
|
* [Everywhere else in the text this is called T3-rtx. -ed] |
|
*/ |
|
struct timer_list T3_rtx_timer; |
|
|
|
/* Heartbeat timer is per destination. */ |
|
struct timer_list hb_timer; |
|
|
|
/* Timer to handle ICMP proto unreachable envets */ |
|
struct timer_list proto_unreach_timer; |
|
|
|
/* Timer to handler reconf chunk rtx */ |
|
struct timer_list reconf_timer; |
|
|
|
/* Since we're using per-destination retransmission timers |
|
* (see above), we're also using per-destination "transmitted" |
|
* queues. This probably ought to be a private struct |
|
* accessible only within the outqueue, but it's not, yet. |
|
*/ |
|
struct list_head transmitted; |
|
|
|
/* We build bundle-able packets for this transport here. */ |
|
struct sctp_packet packet; |
|
|
|
/* This is the list of transports that have chunks to send. */ |
|
struct list_head send_ready; |
|
|
|
/* State information saved for SFR_CACC algorithm. The key |
|
* idea in SFR_CACC is to maintain state at the sender on a |
|
* per-destination basis when a changeover happens. |
|
* char changeover_active; |
|
* char cycling_changeover; |
|
* __u32 next_tsn_at_change; |
|
* char cacc_saw_newack; |
|
*/ |
|
struct { |
|
/* An unsigned integer, which stores the next TSN to be |
|
* used by the sender, at the moment of changeover. |
|
*/ |
|
__u32 next_tsn_at_change; |
|
|
|
/* A flag which indicates the occurrence of a changeover */ |
|
char changeover_active; |
|
|
|
/* A flag which indicates whether the change of primary is |
|
* the first switch to this destination address during an |
|
* active switch. |
|
*/ |
|
char cycling_changeover; |
|
|
|
/* A temporary flag, which is used during the processing of |
|
* a SACK to estimate the causative TSN(s)'s group. |
|
*/ |
|
char cacc_saw_newack; |
|
} cacc; |
|
|
|
/* 64-bit random number sent with heartbeat. */ |
|
__u64 hb_nonce; |
|
|
|
struct rcu_head rcu; |
|
}; |
|
|
|
struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, |
|
gfp_t); |
|
void sctp_transport_set_owner(struct sctp_transport *, |
|
struct sctp_association *); |
|
void sctp_transport_route(struct sctp_transport *, union sctp_addr *, |
|
struct sctp_sock *); |
|
void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); |
|
void sctp_transport_free(struct sctp_transport *); |
|
void sctp_transport_reset_t3_rtx(struct sctp_transport *); |
|
void sctp_transport_reset_hb_timer(struct sctp_transport *); |
|
void sctp_transport_reset_reconf_timer(struct sctp_transport *transport); |
|
int sctp_transport_hold(struct sctp_transport *); |
|
void sctp_transport_put(struct sctp_transport *); |
|
void sctp_transport_update_rto(struct sctp_transport *, __u32); |
|
void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); |
|
void sctp_transport_lower_cwnd(struct sctp_transport *t, |
|
enum sctp_lower_cwnd reason); |
|
void sctp_transport_burst_limited(struct sctp_transport *); |
|
void sctp_transport_burst_reset(struct sctp_transport *); |
|
unsigned long sctp_transport_timeout(struct sctp_transport *); |
|
void sctp_transport_reset(struct sctp_transport *t); |
|
bool sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu); |
|
void sctp_transport_immediate_rtx(struct sctp_transport *); |
|
void sctp_transport_dst_release(struct sctp_transport *t); |
|
void sctp_transport_dst_confirm(struct sctp_transport *t); |
|
|
|
|
|
/* This is the structure we use to queue packets as they come into |
|
* SCTP. We write packets to it and read chunks from it. |
|
*/ |
|
struct sctp_inq { |
|
/* This is actually a queue of sctp_chunk each |
|
* containing a partially decoded packet. |
|
*/ |
|
struct list_head in_chunk_list; |
|
/* This is the packet which is currently off the in queue and is |
|
* being worked on through the inbound chunk processing. |
|
*/ |
|
struct sctp_chunk *in_progress; |
|
|
|
/* This is the delayed task to finish delivering inbound |
|
* messages. |
|
*/ |
|
struct work_struct immediate; |
|
}; |
|
|
|
void sctp_inq_init(struct sctp_inq *); |
|
void sctp_inq_free(struct sctp_inq *); |
|
void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); |
|
struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); |
|
struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); |
|
void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); |
|
|
|
/* This is the structure we use to hold outbound chunks. You push |
|
* chunks in and they automatically pop out the other end as bundled |
|
* packets (it calls (*output_handler)()). |
|
* |
|
* This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, |
|
* and 8.2 of the v13 draft. |
|
* |
|
* It handles retransmissions. The connection to the timeout portion |
|
* of the state machine is through sctp_..._timeout() and timeout_handler. |
|
* |
|
* If you feed it SACKs, it will eat them. |
|
* |
|
* If you give it big chunks, it will fragment them. |
|
* |
|
* It assigns TSN's to data chunks. This happens at the last possible |
|
* instant before transmission. |
|
* |
|
* When free()'d, it empties itself out via output_handler(). |
|
*/ |
|
struct sctp_outq { |
|
struct sctp_association *asoc; |
|
|
|
/* Data pending that has never been transmitted. */ |
|
struct list_head out_chunk_list; |
|
|
|
/* Stream scheduler being used */ |
|
struct sctp_sched_ops *sched; |
|
|
|
unsigned int out_qlen; /* Total length of queued data chunks. */ |
|
|
|
/* Error of send failed, may used in SCTP_SEND_FAILED event. */ |
|
unsigned int error; |
|
|
|
/* These are control chunks we want to send. */ |
|
struct list_head control_chunk_list; |
|
|
|
/* These are chunks that have been sacked but are above the |
|
* CTSN, or cumulative tsn ack point. |
|
*/ |
|
struct list_head sacked; |
|
|
|
/* Put chunks on this list to schedule them for |
|
* retransmission. |
|
*/ |
|
struct list_head retransmit; |
|
|
|
/* Put chunks on this list to save them for FWD TSN processing as |
|
* they were abandoned. |
|
*/ |
|
struct list_head abandoned; |
|
|
|
/* How many unackd bytes do we have in-flight? */ |
|
__u32 outstanding_bytes; |
|
|
|
/* Are we doing fast-rtx on this queue */ |
|
char fast_rtx; |
|
|
|
/* Corked? */ |
|
char cork; |
|
}; |
|
|
|
void sctp_outq_init(struct sctp_association *, struct sctp_outq *); |
|
void sctp_outq_teardown(struct sctp_outq *); |
|
void sctp_outq_free(struct sctp_outq*); |
|
void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); |
|
int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); |
|
int sctp_outq_is_empty(const struct sctp_outq *); |
|
void sctp_outq_restart(struct sctp_outq *); |
|
|
|
void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport, |
|
enum sctp_retransmit_reason reason); |
|
void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); |
|
void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); |
|
void sctp_prsctp_prune(struct sctp_association *asoc, |
|
struct sctp_sndrcvinfo *sinfo, int msg_len); |
|
void sctp_generate_fwdtsn(struct sctp_outq *q, __u32 sack_ctsn); |
|
/* Uncork and flush an outqueue. */ |
|
static inline void sctp_outq_cork(struct sctp_outq *q) |
|
{ |
|
q->cork = 1; |
|
} |
|
|
|
/* SCTP skb control block. |
|
* sctp_input_cb is currently used on rx and sock rx queue |
|
*/ |
|
struct sctp_input_cb { |
|
union { |
|
struct inet_skb_parm h4; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
struct inet6_skb_parm h6; |
|
#endif |
|
} header; |
|
struct sctp_chunk *chunk; |
|
struct sctp_af *af; |
|
__be16 encap_port; |
|
}; |
|
#define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0])) |
|
|
|
struct sctp_output_cb { |
|
struct sk_buff *last; |
|
}; |
|
#define SCTP_OUTPUT_CB(__skb) ((struct sctp_output_cb *)&((__skb)->cb[0])) |
|
|
|
static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb) |
|
{ |
|
const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk; |
|
|
|
return chunk->head_skb ? : skb; |
|
} |
|
|
|
/* These bind address data fields common between endpoints and associations */ |
|
struct sctp_bind_addr { |
|
|
|
/* RFC 2960 12.1 Parameters necessary for the SCTP instance |
|
* |
|
* SCTP Port: The local SCTP port number the endpoint is |
|
* bound to. |
|
*/ |
|
__u16 port; |
|
|
|
/* RFC 2960 12.1 Parameters necessary for the SCTP instance |
|
* |
|
* Address List: The list of IP addresses that this instance |
|
* has bound. This information is passed to one's |
|
* peer(s) in INIT and INIT ACK chunks. |
|
*/ |
|
struct list_head address_list; |
|
}; |
|
|
|
void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); |
|
void sctp_bind_addr_free(struct sctp_bind_addr *); |
|
int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, |
|
const struct sctp_bind_addr *src, |
|
enum sctp_scope scope, gfp_t gfp, |
|
int flags); |
|
int sctp_bind_addr_dup(struct sctp_bind_addr *dest, |
|
const struct sctp_bind_addr *src, |
|
gfp_t gfp); |
|
int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, |
|
int new_size, __u8 addr_state, gfp_t gfp); |
|
int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); |
|
int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, |
|
struct sctp_sock *); |
|
int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, |
|
struct sctp_sock *, struct sctp_sock *); |
|
int sctp_bind_addr_state(const struct sctp_bind_addr *bp, |
|
const union sctp_addr *addr); |
|
int sctp_bind_addrs_check(struct sctp_sock *sp, |
|
struct sctp_sock *sp2, int cnt2); |
|
union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, |
|
const union sctp_addr *addrs, |
|
int addrcnt, |
|
struct sctp_sock *opt); |
|
union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, |
|
int *addrs_len, |
|
gfp_t gfp); |
|
int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, |
|
__u16 port, gfp_t gfp); |
|
|
|
enum sctp_scope sctp_scope(const union sctp_addr *addr); |
|
int sctp_in_scope(struct net *net, const union sctp_addr *addr, |
|
const enum sctp_scope scope); |
|
int sctp_is_any(struct sock *sk, const union sctp_addr *addr); |
|
int sctp_is_ep_boundall(struct sock *sk); |
|
|
|
|
|
/* What type of endpoint? */ |
|
enum sctp_endpoint_type { |
|
SCTP_EP_TYPE_SOCKET, |
|
SCTP_EP_TYPE_ASSOCIATION, |
|
}; |
|
|
|
/* |
|
* A common base class to bridge the implmentation view of a |
|
* socket (usually listening) endpoint versus an association's |
|
* local endpoint. |
|
* This common structure is useful for several purposes: |
|
* 1) Common interface for lookup routines. |
|
* a) Subfunctions work for either endpoint or association |
|
* b) Single interface to lookup allows hiding the lookup lock rather |
|
* than acquiring it externally. |
|
* 2) Common interface for the inbound chunk handling/state machine. |
|
* 3) Common object handling routines for reference counting, etc. |
|
* 4) Disentangle association lookup from endpoint lookup, where we |
|
* do not have to find our endpoint to find our association. |
|
* |
|
*/ |
|
|
|
struct sctp_ep_common { |
|
/* Fields to help us manage our entries in the hash tables. */ |
|
struct hlist_node node; |
|
int hashent; |
|
|
|
/* Runtime type information. What kind of endpoint is this? */ |
|
enum sctp_endpoint_type type; |
|
|
|
/* Some fields to help us manage this object. |
|
* refcnt - Reference count access to this object. |
|
* dead - Do not attempt to use this object. |
|
*/ |
|
refcount_t refcnt; |
|
bool dead; |
|
|
|
/* What socket does this endpoint belong to? */ |
|
struct sock *sk; |
|
|
|
/* Cache netns and it won't change once set */ |
|
struct net *net; |
|
|
|
/* This is where we receive inbound chunks. */ |
|
struct sctp_inq inqueue; |
|
|
|
/* This substructure includes the defining parameters of the |
|
* endpoint: |
|
* bind_addr.port is our shared port number. |
|
* bind_addr.address_list is our set of local IP addresses. |
|
*/ |
|
struct sctp_bind_addr bind_addr; |
|
}; |
|
|
|
|
|
/* RFC Section 1.4 Key Terms |
|
* |
|
* o SCTP endpoint: The logical sender/receiver of SCTP packets. On a |
|
* multi-homed host, an SCTP endpoint is represented to its peers as a |
|
* combination of a set of eligible destination transport addresses to |
|
* which SCTP packets can be sent and a set of eligible source |
|
* transport addresses from which SCTP packets can be received. |
|
* All transport addresses used by an SCTP endpoint must use the |
|
* same port number, but can use multiple IP addresses. A transport |
|
* address used by an SCTP endpoint must not be used by another |
|
* SCTP endpoint. In other words, a transport address is unique |
|
* to an SCTP endpoint. |
|
* |
|
* From an implementation perspective, each socket has one of these. |
|
* A TCP-style socket will have exactly one association on one of |
|
* these. An UDP-style socket will have multiple associations hanging |
|
* off one of these. |
|
*/ |
|
|
|
struct sctp_endpoint { |
|
/* Common substructure for endpoint and association. */ |
|
struct sctp_ep_common base; |
|
|
|
/* Associations: A list of current associations and mappings |
|
* to the data consumers for each association. This |
|
* may be in the form of a hash table or other |
|
* implementation dependent structure. The data |
|
* consumers may be process identification |
|
* information such as file descriptors, named pipe |
|
* pointer, or table pointers dependent on how SCTP |
|
* is implemented. |
|
*/ |
|
/* This is really a list of struct sctp_association entries. */ |
|
struct list_head asocs; |
|
|
|
/* Secret Key: A secret key used by this endpoint to compute |
|
* the MAC. This SHOULD be a cryptographic quality |
|
* random number with a sufficient length. |
|
* Discussion in [RFC1750] can be helpful in |
|
* selection of the key. |
|
*/ |
|
__u8 secret_key[SCTP_SECRET_SIZE]; |
|
|
|
/* digest: This is a digest of the sctp cookie. This field is |
|
* only used on the receive path when we try to validate |
|
* that the cookie has not been tampered with. We put |
|
* this here so we pre-allocate this once and can re-use |
|
* on every receive. |
|
*/ |
|
__u8 *digest; |
|
|
|
/* sendbuf acct. policy. */ |
|
__u32 sndbuf_policy; |
|
|
|
/* rcvbuf acct. policy. */ |
|
__u32 rcvbuf_policy; |
|
|
|
/* SCTP AUTH: array of the HMACs that will be allocated |
|
* we need this per association so that we don't serialize |
|
*/ |
|
struct crypto_shash **auth_hmacs; |
|
|
|
/* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ |
|
struct sctp_hmac_algo_param *auth_hmacs_list; |
|
|
|
/* SCTP-AUTH: chunks to authenticate encoded into parameter */ |
|
struct sctp_chunks_param *auth_chunk_list; |
|
|
|
/* SCTP-AUTH: endpoint shared keys */ |
|
struct list_head endpoint_shared_keys; |
|
__u16 active_key_id; |
|
__u8 ecn_enable:1, |
|
auth_enable:1, |
|
intl_enable:1, |
|
prsctp_enable:1, |
|
asconf_enable:1, |
|
reconf_enable:1; |
|
|
|
__u8 strreset_enable; |
|
|
|
/* Security identifiers from incoming (INIT). These are set by |
|
* security_sctp_assoc_request(). These will only be used by |
|
* SCTP TCP type sockets and peeled off connections as they |
|
* cause a new socket to be generated. security_sctp_sk_clone() |
|
* will then plug these into the new socket. |
|
*/ |
|
|
|
u32 secid; |
|
u32 peer_secid; |
|
}; |
|
|
|
/* Recover the outter endpoint structure. */ |
|
static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) |
|
{ |
|
struct sctp_endpoint *ep; |
|
|
|
ep = container_of(base, struct sctp_endpoint, base); |
|
return ep; |
|
} |
|
|
|
/* These are function signatures for manipulating endpoints. */ |
|
struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); |
|
void sctp_endpoint_free(struct sctp_endpoint *); |
|
void sctp_endpoint_put(struct sctp_endpoint *); |
|
void sctp_endpoint_hold(struct sctp_endpoint *); |
|
void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); |
|
struct sctp_association *sctp_endpoint_lookup_assoc( |
|
const struct sctp_endpoint *ep, |
|
const union sctp_addr *paddr, |
|
struct sctp_transport **); |
|
bool sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep, |
|
const union sctp_addr *paddr); |
|
struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, |
|
struct net *, const union sctp_addr *); |
|
bool sctp_has_association(struct net *net, const union sctp_addr *laddr, |
|
const union sctp_addr *paddr); |
|
|
|
int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, |
|
const struct sctp_association *asoc, |
|
enum sctp_cid cid, struct sctp_init_chunk *peer_init, |
|
struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); |
|
int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, |
|
const union sctp_addr *peer, |
|
struct sctp_init_chunk *init, gfp_t gfp); |
|
__u32 sctp_generate_tag(const struct sctp_endpoint *); |
|
__u32 sctp_generate_tsn(const struct sctp_endpoint *); |
|
|
|
struct sctp_inithdr_host { |
|
__u32 init_tag; |
|
__u32 a_rwnd; |
|
__u16 num_outbound_streams; |
|
__u16 num_inbound_streams; |
|
__u32 initial_tsn; |
|
}; |
|
|
|
struct sctp_stream_priorities { |
|
/* List of priorities scheduled */ |
|
struct list_head prio_sched; |
|
/* List of streams scheduled */ |
|
struct list_head active; |
|
/* The next stream in line */ |
|
struct sctp_stream_out_ext *next; |
|
__u16 prio; |
|
}; |
|
|
|
struct sctp_stream_out_ext { |
|
__u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; |
|
__u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; |
|
struct list_head outq; /* chunks enqueued by this stream */ |
|
union { |
|
struct { |
|
/* Scheduled streams list */ |
|
struct list_head prio_list; |
|
struct sctp_stream_priorities *prio_head; |
|
}; |
|
/* Fields used by RR scheduler */ |
|
struct { |
|
struct list_head rr_list; |
|
}; |
|
}; |
|
}; |
|
|
|
struct sctp_stream_out { |
|
union { |
|
__u32 mid; |
|
__u16 ssn; |
|
}; |
|
__u32 mid_uo; |
|
struct sctp_stream_out_ext *ext; |
|
__u8 state; |
|
}; |
|
|
|
struct sctp_stream_in { |
|
union { |
|
__u32 mid; |
|
__u16 ssn; |
|
}; |
|
__u32 mid_uo; |
|
__u32 fsn; |
|
__u32 fsn_uo; |
|
char pd_mode; |
|
char pd_mode_uo; |
|
}; |
|
|
|
struct sctp_stream { |
|
GENRADIX(struct sctp_stream_out) out; |
|
GENRADIX(struct sctp_stream_in) in; |
|
|
|
__u16 outcnt; |
|
__u16 incnt; |
|
/* Current stream being sent, if any */ |
|
struct sctp_stream_out *out_curr; |
|
union { |
|
/* Fields used by priority scheduler */ |
|
struct { |
|
/* List of priorities scheduled */ |
|
struct list_head prio_list; |
|
}; |
|
/* Fields used by RR scheduler */ |
|
struct { |
|
/* List of streams scheduled */ |
|
struct list_head rr_list; |
|
/* The next stream in line */ |
|
struct sctp_stream_out_ext *rr_next; |
|
}; |
|
}; |
|
struct sctp_stream_interleave *si; |
|
}; |
|
|
|
static inline struct sctp_stream_out *sctp_stream_out( |
|
struct sctp_stream *stream, |
|
__u16 sid) |
|
{ |
|
return genradix_ptr(&stream->out, sid); |
|
} |
|
|
|
static inline struct sctp_stream_in *sctp_stream_in( |
|
struct sctp_stream *stream, |
|
__u16 sid) |
|
{ |
|
return genradix_ptr(&stream->in, sid); |
|
} |
|
|
|
#define SCTP_SO(s, i) sctp_stream_out((s), (i)) |
|
#define SCTP_SI(s, i) sctp_stream_in((s), (i)) |
|
|
|
#define SCTP_STREAM_CLOSED 0x00 |
|
#define SCTP_STREAM_OPEN 0x01 |
|
|
|
static inline __u16 sctp_datachk_len(const struct sctp_stream *stream) |
|
{ |
|
return stream->si->data_chunk_len; |
|
} |
|
|
|
static inline __u16 sctp_datahdr_len(const struct sctp_stream *stream) |
|
{ |
|
return stream->si->data_chunk_len - sizeof(struct sctp_chunkhdr); |
|
} |
|
|
|
static inline __u16 sctp_ftsnchk_len(const struct sctp_stream *stream) |
|
{ |
|
return stream->si->ftsn_chunk_len; |
|
} |
|
|
|
static inline __u16 sctp_ftsnhdr_len(const struct sctp_stream *stream) |
|
{ |
|
return stream->si->ftsn_chunk_len - sizeof(struct sctp_chunkhdr); |
|
} |
|
|
|
/* SCTP_GET_ASSOC_STATS counters */ |
|
struct sctp_priv_assoc_stats { |
|
/* Maximum observed rto in the association during subsequent |
|
* observations. Value is set to 0 if no RTO measurement took place |
|
* The transport where the max_rto was observed is returned in |
|
* obs_rto_ipaddr |
|
*/ |
|
struct sockaddr_storage obs_rto_ipaddr; |
|
__u64 max_obs_rto; |
|
/* Total In and Out SACKs received and sent */ |
|
__u64 isacks; |
|
__u64 osacks; |
|
/* Total In and Out packets received and sent */ |
|
__u64 opackets; |
|
__u64 ipackets; |
|
/* Total retransmitted chunks */ |
|
__u64 rtxchunks; |
|
/* TSN received > next expected */ |
|
__u64 outofseqtsns; |
|
/* Duplicate Chunks received */ |
|
__u64 idupchunks; |
|
/* Gap Ack Blocks received */ |
|
__u64 gapcnt; |
|
/* Unordered data chunks sent and received */ |
|
__u64 ouodchunks; |
|
__u64 iuodchunks; |
|
/* Ordered data chunks sent and received */ |
|
__u64 oodchunks; |
|
__u64 iodchunks; |
|
/* Control chunks sent and received */ |
|
__u64 octrlchunks; |
|
__u64 ictrlchunks; |
|
}; |
|
|
|
/* RFC2960 |
|
* |
|
* 12. Recommended Transmission Control Block (TCB) Parameters |
|
* |
|
* This section details a recommended set of parameters that should |
|
* be contained within the TCB for an implementation. This section is |
|
* for illustrative purposes and should not be deemed as requirements |
|
* on an implementation or as an exhaustive list of all parameters |
|
* inside an SCTP TCB. Each implementation may need its own additional |
|
* parameters for optimization. |
|
*/ |
|
|
|
|
|
/* Here we have information about each individual association. */ |
|
struct sctp_association { |
|
|
|
/* A base structure common to endpoint and association. |
|
* In this context, it represents the associations's view |
|
* of the local endpoint of the association. |
|
*/ |
|
struct sctp_ep_common base; |
|
|
|
/* Associations on the same socket. */ |
|
struct list_head asocs; |
|
|
|
/* association id. */ |
|
sctp_assoc_t assoc_id; |
|
|
|
/* This is our parent endpoint. */ |
|
struct sctp_endpoint *ep; |
|
|
|
/* These are those association elements needed in the cookie. */ |
|
struct sctp_cookie c; |
|
|
|
/* This is all information about our peer. */ |
|
struct { |
|
/* transport_addr_list |
|
* |
|
* Peer : A list of SCTP transport addresses that the |
|
* Transport : peer is bound to. This information is derived |
|
* Address : from the INIT or INIT ACK and is used to |
|
* List : associate an inbound packet with a given |
|
* : association. Normally this information is |
|
* : hashed or keyed for quick lookup and access |
|
* : of the TCB. |
|
* : The list is also initialized with the list |
|
* : of addresses passed with the sctp_connectx() |
|
* : call. |
|
* |
|
* It is a list of SCTP_transport's. |
|
*/ |
|
struct list_head transport_addr_list; |
|
|
|
/* rwnd |
|
* |
|
* Peer Rwnd : Current calculated value of the peer's rwnd. |
|
*/ |
|
__u32 rwnd; |
|
|
|
/* transport_count |
|
* |
|
* Peer : A count of the number of peer addresses |
|
* Transport : in the Peer Transport Address List. |
|
* Address : |
|
* Count : |
|
*/ |
|
__u16 transport_count; |
|
|
|
/* port |
|
* The transport layer port number. |
|
*/ |
|
__u16 port; |
|
|
|
/* primary_path |
|
* |
|
* Primary : This is the current primary destination |
|
* Path : transport address of the peer endpoint. It |
|
* : may also specify a source transport address |
|
* : on this endpoint. |
|
* |
|
* All of these paths live on transport_addr_list. |
|
* |
|
* At the bakeoffs, we discovered that the intent of |
|
* primaryPath is that it only changes when the ULP |
|
* asks to have it changed. We add the activePath to |
|
* designate the connection we are currently using to |
|
* transmit new data and most control chunks. |
|
*/ |
|
struct sctp_transport *primary_path; |
|
|
|
/* Cache the primary path address here, when we |
|
* need a an address for msg_name. |
|
*/ |
|
union sctp_addr primary_addr; |
|
|
|
/* active_path |
|
* The path that we are currently using to |
|
* transmit new data and most control chunks. |
|
*/ |
|
struct sctp_transport *active_path; |
|
|
|
/* retran_path |
|
* |
|
* RFC2960 6.4 Multi-homed SCTP Endpoints |
|
* ... |
|
* Furthermore, when its peer is multi-homed, an |
|
* endpoint SHOULD try to retransmit a chunk to an |
|
* active destination transport address that is |
|
* different from the last destination address to |
|
* which the DATA chunk was sent. |
|
*/ |
|
struct sctp_transport *retran_path; |
|
|
|
/* Pointer to last transport I have sent on. */ |
|
struct sctp_transport *last_sent_to; |
|
|
|
/* This is the last transport I have received DATA on. */ |
|
struct sctp_transport *last_data_from; |
|
|
|
/* |
|
* 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. |
|
* |
|
* 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. This value is hidden |
|
* in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). |
|
*/ |
|
struct sctp_tsnmap tsn_map; |
|
|
|
/* This mask is used to disable sending the ASCONF chunk |
|
* with specified parameter to peer. |
|
*/ |
|
__be16 addip_disabled_mask; |
|
|
|
/* These are capabilities which our peer advertised. */ |
|
__u16 ecn_capable:1, /* Can peer do ECN? */ |
|
ipv4_address:1, /* Peer understands IPv4 addresses? */ |
|
ipv6_address:1, /* Peer understands IPv6 addresses? */ |
|
hostname_address:1, /* Peer understands DNS addresses? */ |
|
asconf_capable:1, /* Does peer support ADDIP? */ |
|
prsctp_capable:1, /* Can peer do PR-SCTP? */ |
|
reconf_capable:1, /* Can peer do RE-CONFIG? */ |
|
intl_capable:1, /* Can peer do INTERLEAVE */ |
|
auth_capable:1, /* Is peer doing SCTP-AUTH? */ |
|
/* sack_needed: |
|
* This flag indicates if the next received |
|
* packet is to be responded to with a |
|
* SACK. This is initialized to 0. When a packet |
|
* is received sack_cnt is incremented. If this value |
|
* reaches 2 or more, a SACK is sent and the |
|
* value is reset to 0. Note: This is used only |
|
* when no DATA chunks are received out of |
|
* order. When DATA chunks are out of order, |
|
* SACK's are not delayed (see Section 6). |
|
*/ |
|
sack_needed:1, /* Do we need to sack the peer? */ |
|
sack_generation:1, |
|
zero_window_announced:1; |
|
|
|
__u32 sack_cnt; |
|
|
|
__u32 adaptation_ind; /* Adaptation Code point. */ |
|
|
|
struct sctp_inithdr_host i; |
|
void *cookie; |
|
int cookie_len; |
|
|
|
/* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. |
|
* C1) ... "Peer-Serial-Number'. This value MUST be initialized to the |
|
* Initial TSN Value minus 1 |
|
*/ |
|
__u32 addip_serial; |
|
|
|
/* SCTP-AUTH: We need to know pears random number, hmac list |
|
* and authenticated chunk list. All that is part of the |
|
* cookie and these are just pointers to those locations |
|
*/ |
|
struct sctp_random_param *peer_random; |
|
struct sctp_chunks_param *peer_chunks; |
|
struct sctp_hmac_algo_param *peer_hmacs; |
|
} peer; |
|
|
|
/* State : A state variable indicating what state the |
|
* : association is in, i.e. COOKIE-WAIT, |
|
* : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, |
|
* : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. |
|
* |
|
* Note: No "CLOSED" state is illustrated since if a |
|
* association is "CLOSED" its TCB SHOULD be removed. |
|
* |
|
* In this implementation we DO have a CLOSED |
|
* state which is used during initiation and shutdown. |
|
* |
|
* State takes values from SCTP_STATE_*. |
|
*/ |
|
enum sctp_state state; |
|
|
|
/* Overall : The overall association error count. |
|
* Error Count : [Clear this any time I get something.] |
|
*/ |
|
int overall_error_count; |
|
|
|
/* The cookie life I award for any cookie. */ |
|
ktime_t cookie_life; |
|
|
|
/* These are the association's initial, max, and min RTO values. |
|
* These values will be initialized by system defaults, but can |
|
* be modified via the SCTP_RTOINFO socket option. |
|
*/ |
|
unsigned long rto_initial; |
|
unsigned long rto_max; |
|
unsigned long rto_min; |
|
|
|
/* Maximum number of new data packets that can be sent in a burst. */ |
|
int max_burst; |
|
|
|
/* This is the max_retrans value for the association. This value will |
|
* be initialized from system defaults, but can be |
|
* modified by the SCTP_ASSOCINFO socket option. |
|
*/ |
|
int max_retrans; |
|
|
|
/* This is the partially failed retrans value for the transport |
|
* and will be initialized from the assocs value. This can be |
|
* changed using the SCTP_PEER_ADDR_THLDS socket option |
|
*/ |
|
__u16 pf_retrans; |
|
/* Used for primary path switchover. */ |
|
__u16 ps_retrans; |
|
|
|
/* Maximum number of times the endpoint will retransmit INIT */ |
|
__u16 max_init_attempts; |
|
|
|
/* How many times have we resent an INIT? */ |
|
__u16 init_retries; |
|
|
|
/* The largest timeout or RTO value to use in attempting an INIT */ |
|
unsigned long max_init_timeo; |
|
|
|
/* Heartbeat interval: The endpoint sends out a Heartbeat chunk to |
|
* the destination address every heartbeat interval. This value |
|
* will be inherited by all new transports. |
|
*/ |
|
unsigned long hbinterval; |
|
|
|
__be16 encap_port; |
|
|
|
/* This is the max_retrans value for new transports in the |
|
* association. |
|
*/ |
|
__u16 pathmaxrxt; |
|
|
|
__u32 flowlabel; |
|
__u8 dscp; |
|
|
|
/* Flag that path mtu update is pending */ |
|
__u8 pmtu_pending; |
|
|
|
/* Association : The smallest PMTU discovered for all of the |
|
* PMTU : peer's transport addresses. |
|
*/ |
|
__u32 pathmtu; |
|
|
|
/* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ |
|
__u32 param_flags; |
|
|
|
__u32 sackfreq; |
|
/* SACK delay timeout */ |
|
unsigned long sackdelay; |
|
|
|
unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; |
|
struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; |
|
|
|
/* Transport to which SHUTDOWN chunk was last sent. */ |
|
struct sctp_transport *shutdown_last_sent_to; |
|
|
|
/* Transport to which INIT chunk was last sent. */ |
|
struct sctp_transport *init_last_sent_to; |
|
|
|
/* How many times have we resent a SHUTDOWN */ |
|
int shutdown_retries; |
|
|
|
/* Next TSN : The next TSN number to be assigned to a new |
|
* : DATA chunk. This is sent in the INIT or INIT |
|
* : ACK chunk to the peer and incremented each |
|
* : time a DATA chunk is assigned a TSN |
|
* : (normally just prior to transmit or during |
|
* : fragmentation). |
|
*/ |
|
__u32 next_tsn; |
|
|
|
/* |
|
* Last Rcvd : This is the last TSN received in sequence. This value |
|
* TSN : is set initially by taking the peer's Initial TSN, |
|
* : received in the INIT or INIT ACK chunk, and |
|
* : subtracting one from it. |
|
* |
|
* Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. |
|
*/ |
|
|
|
__u32 ctsn_ack_point; |
|
|
|
/* PR-SCTP Advanced.Peer.Ack.Point */ |
|
__u32 adv_peer_ack_point; |
|
|
|
/* Highest TSN that is acknowledged by incoming SACKs. */ |
|
__u32 highest_sacked; |
|
|
|
/* TSN marking the fast recovery exit point */ |
|
__u32 fast_recovery_exit; |
|
|
|
/* Flag to track the current fast recovery state */ |
|
__u8 fast_recovery; |
|
|
|
/* The number of unacknowledged data chunks. Reported through |
|
* the SCTP_STATUS sockopt. |
|
*/ |
|
__u16 unack_data; |
|
|
|
/* The total number of data chunks that we've had to retransmit |
|
* as the result of a T3 timer expiration |
|
*/ |
|
__u32 rtx_data_chunks; |
|
|
|
/* This is the association's receive buffer space. This value is used |
|
* to set a_rwnd field in an INIT or a SACK chunk. |
|
*/ |
|
__u32 rwnd; |
|
|
|
/* This is the last advertised value of rwnd over a SACK chunk. */ |
|
__u32 a_rwnd; |
|
|
|
/* Number of bytes by which the rwnd has slopped. The rwnd is allowed |
|
* to slop over a maximum of the association's frag_point. |
|
*/ |
|
__u32 rwnd_over; |
|
|
|
/* Keeps treack of rwnd pressure. This happens when we have |
|
* a window, but not recevie buffer (i.e small packets). This one |
|
* is releases slowly (1 PMTU at a time ). |
|
*/ |
|
__u32 rwnd_press; |
|
|
|
/* This is the sndbuf size in use for the association. |
|
* This corresponds to the sndbuf size for the association, |
|
* as specified in the sk->sndbuf. |
|
*/ |
|
int sndbuf_used; |
|
|
|
/* This is the amount of memory that this association has allocated |
|
* in the receive path at any given time. |
|
*/ |
|
atomic_t rmem_alloc; |
|
|
|
/* This is the wait queue head for send requests waiting on |
|
* the association sndbuf space. |
|
*/ |
|
wait_queue_head_t wait; |
|
|
|
/* The message size at which SCTP fragmentation will occur. */ |
|
__u32 frag_point; |
|
__u32 user_frag; |
|
|
|
/* Counter used to count INIT errors. */ |
|
int init_err_counter; |
|
|
|
/* Count the number of INIT cycles (for doubling timeout). */ |
|
int init_cycle; |
|
|
|
/* Default send parameters. */ |
|
__u16 default_stream; |
|
__u16 default_flags; |
|
__u32 default_ppid; |
|
__u32 default_context; |
|
__u32 default_timetolive; |
|
|
|
/* Default receive parameters */ |
|
__u32 default_rcv_context; |
|
|
|
/* Stream arrays */ |
|
struct sctp_stream stream; |
|
|
|
/* All outbound chunks go through this structure. */ |
|
struct sctp_outq outqueue; |
|
|
|
/* A smart pipe that will handle reordering and fragmentation, |
|
* as well as handle passing events up to the ULP. |
|
*/ |
|
struct sctp_ulpq ulpq; |
|
|
|
/* Last TSN that caused an ECNE Chunk to be sent. */ |
|
__u32 last_ecne_tsn; |
|
|
|
/* Last TSN that caused a CWR Chunk to be sent. */ |
|
__u32 last_cwr_tsn; |
|
|
|
/* How many duplicated TSNs have we seen? */ |
|
int numduptsns; |
|
|
|
/* These are to support |
|
* "SCTP Extensions for Dynamic Reconfiguration of IP Addresses |
|
* and Enforcement of Flow and Message Limits" |
|
* <draft-ietf-tsvwg-addip-sctp-02.txt> |
|
* or "ADDIP" for short. |
|
*/ |
|
|
|
|
|
|
|
/* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks |
|
* |
|
* R1) One and only one ASCONF Chunk MAY be in transit and |
|
* unacknowledged at any one time. If a sender, after sending |
|
* an ASCONF chunk, decides it needs to transfer another |
|
* ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk |
|
* returns from the previous ASCONF Chunk before sending a |
|
* subsequent ASCONF. Note this restriction binds each side, |
|
* so at any time two ASCONF may be in-transit on any given |
|
* association (one sent from each endpoint). |
|
* |
|
* [This is our one-and-only-one ASCONF in flight. If we do |
|
* not have an ASCONF in flight, this is NULL.] |
|
*/ |
|
struct sctp_chunk *addip_last_asconf; |
|
|
|
/* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. |
|
* |
|
* This is needed to implement itmes E1 - E4 of the updated |
|
* spec. Here is the justification: |
|
* |
|
* Since the peer may bundle multiple ASCONF chunks toward us, |
|
* we now need the ability to cache multiple ACKs. The section |
|
* describes in detail how they are cached and cleaned up. |
|
*/ |
|
struct list_head asconf_ack_list; |
|
|
|
/* These ASCONF chunks are waiting to be sent. |
|
* |
|
* These chunaks can't be pushed to outqueue until receiving |
|
* ASCONF_ACK for the previous ASCONF indicated by |
|
* addip_last_asconf, so as to guarantee that only one ASCONF |
|
* is in flight at any time. |
|
* |
|
* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks |
|
* |
|
* In defining the ASCONF Chunk transfer procedures, it is |
|
* essential that these transfers MUST NOT cause congestion |
|
* within the network. To achieve this, we place these |
|
* restrictions on the transfer of ASCONF Chunks: |
|
* |
|
* R1) One and only one ASCONF Chunk MAY be in transit and |
|
* unacknowledged at any one time. If a sender, after sending |
|
* an ASCONF chunk, decides it needs to transfer another |
|
* ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk |
|
* returns from the previous ASCONF Chunk before sending a |
|
* subsequent ASCONF. Note this restriction binds each side, |
|
* so at any time two ASCONF may be in-transit on any given |
|
* association (one sent from each endpoint). |
|
* |
|
* |
|
* [I really think this is EXACTLY the sort of intelligence |
|
* which already resides in sctp_outq. Please move this |
|
* queue and its supporting logic down there. --piggy] |
|
*/ |
|
struct list_head addip_chunk_list; |
|
|
|
/* ADDIP Section 4.1 ASCONF Chunk Procedures |
|
* |
|
* A2) A serial number should be assigned to the Chunk. The |
|
* serial number SHOULD be a monotonically increasing |
|
* number. The serial number SHOULD be initialized at |
|
* the start of the association to the same value as the |
|
* Initial TSN and every time a new ASCONF chunk is created |
|
* it is incremented by one after assigning the serial number |
|
* to the newly created chunk. |
|
* |
|
* ADDIP |
|
* 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) |
|
* |
|
* Serial Number : 32 bits (unsigned integer) |
|
* |
|
* This value represents a Serial Number for the ASCONF |
|
* Chunk. The valid range of Serial Number is from 0 to |
|
* 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 |
|
* after reaching 4294967295. |
|
*/ |
|
__u32 addip_serial; |
|
int src_out_of_asoc_ok; |
|
union sctp_addr *asconf_addr_del_pending; |
|
struct sctp_transport *new_transport; |
|
|
|
/* SCTP AUTH: list of the endpoint shared keys. These |
|
* keys are provided out of band by the user applicaton |
|
* and can't change during the lifetime of the association |
|
*/ |
|
struct list_head endpoint_shared_keys; |
|
|
|
/* SCTP AUTH: |
|
* The current generated assocaition shared key (secret) |
|
*/ |
|
struct sctp_auth_bytes *asoc_shared_key; |
|
struct sctp_shared_key *shkey; |
|
|
|
/* SCTP AUTH: hmac id of the first peer requested algorithm |
|
* that we support. |
|
*/ |
|
__u16 default_hmac_id; |
|
|
|
__u16 active_key_id; |
|
|
|
__u8 need_ecne:1, /* Need to send an ECNE Chunk? */ |
|
temp:1, /* Is it a temporary association? */ |
|
pf_expose:2, /* Expose pf state? */ |
|
force_delay:1; |
|
|
|
__u8 strreset_enable; |
|
__u8 strreset_outstanding; /* request param count on the fly */ |
|
|
|
__u32 strreset_outseq; /* Update after receiving response */ |
|
__u32 strreset_inseq; /* Update after receiving request */ |
|
__u32 strreset_result[2]; /* save the results of last 2 responses */ |
|
|
|
struct sctp_chunk *strreset_chunk; /* save request chunk */ |
|
|
|
struct sctp_priv_assoc_stats stats; |
|
|
|
int sent_cnt_removable; |
|
|
|
__u16 subscribe; |
|
|
|
__u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; |
|
__u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; |
|
|
|
struct rcu_head rcu; |
|
}; |
|
|
|
|
|
/* An eyecatcher for determining if we are really looking at an |
|
* association data structure. |
|
*/ |
|
enum { |
|
SCTP_ASSOC_EYECATCHER = 0xa550c123, |
|
}; |
|
|
|
/* Recover the outter association structure. */ |
|
static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) |
|
{ |
|
struct sctp_association *asoc; |
|
|
|
asoc = container_of(base, struct sctp_association, base); |
|
return asoc; |
|
} |
|
|
|
/* These are function signatures for manipulating associations. */ |
|
|
|
|
|
struct sctp_association * |
|
sctp_association_new(const struct sctp_endpoint *ep, const struct sock *sk, |
|
enum sctp_scope scope, gfp_t gfp); |
|
void sctp_association_free(struct sctp_association *); |
|
void sctp_association_put(struct sctp_association *); |
|
void sctp_association_hold(struct sctp_association *); |
|
|
|
struct sctp_transport *sctp_assoc_choose_alter_transport( |
|
struct sctp_association *, struct sctp_transport *); |
|
void sctp_assoc_update_retran_path(struct sctp_association *); |
|
struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, |
|
const union sctp_addr *); |
|
int sctp_assoc_lookup_laddr(struct sctp_association *asoc, |
|
const union sctp_addr *laddr); |
|
struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, |
|
const union sctp_addr *address, |
|
const gfp_t gfp, |
|
const int peer_state); |
|
void sctp_assoc_del_peer(struct sctp_association *asoc, |
|
const union sctp_addr *addr); |
|
void sctp_assoc_rm_peer(struct sctp_association *asoc, |
|
struct sctp_transport *peer); |
|
void sctp_assoc_control_transport(struct sctp_association *asoc, |
|
struct sctp_transport *transport, |
|
enum sctp_transport_cmd command, |
|
sctp_sn_error_t error); |
|
struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); |
|
void sctp_assoc_migrate(struct sctp_association *, struct sock *); |
|
int sctp_assoc_update(struct sctp_association *old, |
|
struct sctp_association *new); |
|
|
|
__u32 sctp_association_get_next_tsn(struct sctp_association *); |
|
|
|
void sctp_assoc_update_frag_point(struct sctp_association *asoc); |
|
void sctp_assoc_set_pmtu(struct sctp_association *asoc, __u32 pmtu); |
|
void sctp_assoc_sync_pmtu(struct sctp_association *asoc); |
|
void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); |
|
void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); |
|
void sctp_assoc_set_primary(struct sctp_association *, |
|
struct sctp_transport *); |
|
void sctp_assoc_del_nonprimary_peers(struct sctp_association *, |
|
struct sctp_transport *); |
|
int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, |
|
enum sctp_scope scope, gfp_t gfp); |
|
int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, |
|
struct sctp_cookie*, |
|
gfp_t gfp); |
|
int sctp_assoc_set_id(struct sctp_association *, gfp_t); |
|
void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); |
|
struct sctp_chunk *sctp_assoc_lookup_asconf_ack( |
|
const struct sctp_association *asoc, |
|
__be32 serial); |
|
void sctp_asconf_queue_teardown(struct sctp_association *asoc); |
|
|
|
int sctp_cmp_addr_exact(const union sctp_addr *ss1, |
|
const union sctp_addr *ss2); |
|
struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); |
|
|
|
/* A convenience structure to parse out SCTP specific CMSGs. */ |
|
struct sctp_cmsgs { |
|
struct sctp_initmsg *init; |
|
struct sctp_sndrcvinfo *srinfo; |
|
struct sctp_sndinfo *sinfo; |
|
struct sctp_prinfo *prinfo; |
|
struct sctp_authinfo *authinfo; |
|
struct msghdr *addrs_msg; |
|
}; |
|
|
|
/* Structure for tracking memory objects */ |
|
struct sctp_dbg_objcnt_entry { |
|
char *label; |
|
atomic_t *counter; |
|
}; |
|
|
|
#endif /* __sctp_structs_h__ */
|
|
|