#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_inet sa; /* Large enough for both address families */ struct sockaddr_in v4; struct sockaddr_in6 v6;
};
/* Used for hashing all associations. */ struct sctp_hashbucket {
rwlock_t lock; struct hlist_head chain;
} __attribute__((__aligned__(8)));
/* The SCTP globals structure. */ externstruct 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;
/* 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;
/* 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;
__u32 probe_interval;
__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;
/* 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;
/* 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; unsignedlong sent_at;
__u64 hb_nonce;
__u32 probe_size;
};
/* 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, unsignedint 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) (constunion sctp_addr *addr1, constunion 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); bool (*from_addr_param) (union sctp_addr *, union sctp_addr_param *,
__be16 port, int iif); int (*to_addr_param) (constunion sctp_addr *, union sctp_addr_param *); int (*addr_valid) (union sctp_addr *, struct sctp_sock *, conststruct sk_buff *); enum sctp_scope (*scope)(union sctp_addr *); void (*inaddr_any) (union sctp_addr *, __be16); int (*is_any) (constunion sctp_addr *); int (*available) (union sctp_addr *, struct sctp_sock *); int (*skb_iif) (conststruct sk_buff *sk); int (*skb_sdif)(conststruct sk_buff *sk); int (*is_ce) (conststruct 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) (constunion sctp_addr *, constunion 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)(conststruct 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? */ unsignedlong expires_at; /* Did the message 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 */
};
/* 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;
/* 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. */ unsignedlong 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 */
pmtu_probe:1, /* Used by PLPMTUD, can be set in s HB chunk */
tsn_missing_report:2, /* Data chunk missing counter. */
fast_retransmit:2; /* Is this chunk fast retransmitted? */
};
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 */
};
/* 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;
__u32 dead:1, /* 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.
*/
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 transport */
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. */ unsignedlong 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 */
/* Heartbeat interval: The endpoint sends out a Heartbeat chunk to * the destination address every heartbeat interval.
*/ unsignedlong hbinterval; unsignedlong probe_interval;
/* 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
*/ unsignedlong last_time_sent;
/* Last time(in jiffies) when cwnd is reduced due to the congestion * indication based on ECNE chunk.
*/ unsignedlong 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. */ unsignedshort 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 send a probe HB packet for PLPMTUD */ struct timer_list probe_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;
/* 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;
};
/* 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;
unsignedint out_qlen; /* Total length of queued data chunks. */
/* Error of send failed, may used in SCTP_SEND_FAILED event. */ unsignedint 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;
/* 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, conststruct sctp_bind_addr *src, enum sctp_scope scope, gfp_t gfp, int flags); int sctp_bind_addr_dup(struct sctp_bind_addr *dest, conststruct 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 *, constunion sctp_addr *, struct sctp_sock *); int sctp_bind_addr_conflict(struct sctp_bind_addr *, constunion sctp_addr *, struct sctp_sock *, struct sctp_sock *); int sctp_bind_addr_state(conststruct sctp_bind_addr *bp, constunion 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, constunion sctp_addr *addrs, int addrcnt, struct sctp_sock *opt); union sctp_params sctp_bind_addrs_to_raw(conststruct 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(constunion sctp_addr *addr); int sctp_in_scope(struct net *net, constunion sctp_addr *addr, constenum sctp_scope scope); int sctp_is_any(struct sock *sk, constunion 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 implementation 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 { /* 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;
/* Fields to help us manage our entries in the hash tables. */ struct hlist_node node; int hashent;
/* 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;
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;
__u16 users;
};
__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 { struct list_head fc_list;
};
}; struct sctp_stream_interleave *si;
};
/* 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? */
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;
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.
*/ unsignedlong rto_initial; unsignedlong rto_max; unsignedlong 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 */ unsignedlong 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.
*/ unsignedlong hbinterval; unsignedlong probe_interval;
__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;
/* 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.
*/
/* 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 receive 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;
/* 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 items 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 chunks 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 application * and can't change during the lifetime of the association
*/ struct list_head endpoint_shared_keys;
/* SCTP AUTH: * The current generated association 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 */
/* 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;
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 outer association structure. */ staticinlinestruct sctp_association *sctp_assoc(struct sctp_ep_common *base)
{ struct sctp_association *asoc;
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