net/sctp/structs.h

1 /* SPDX-License-Identifier: GPL-2.0-or-later */
4  * Copyright (c) 1999-2000 Cisco, Inc.
5  * Copyright (c) 1999-2001 Motorola, Inc.
12  *    lksctp developers <linux-sctp@vger.kernel.org>
36 #include <linux/generic-radix-tree.h>
37 #include <linux/rhashtable-types.h>
247 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp)  in sctp_opt2sk()  argument
249        return (struct sock *)sp;  in sctp_opt2sk()
260 /* This is our APPLICATION-SPECIFIC state cookie.
309 	 * Include the source port of the INIT-ACK
329 	 * the association TCB is re-constructed from the cookie.
376  *    The Sender-specific Heartbeat Info field should normally include
398 	(sctp_stream_##type((stream), (sid))->ssn)
402 	(sctp_stream_##type((stream), (sid))->ssn++)
406 	(sctp_stream_##type((stream), (sid))->ssn = ssn + 1)
410 	(sctp_stream_##type((stream), (sid))->mid)
414 	(sctp_stream_##type((stream), (sid))->mid++)
418 	(sctp_stream_##type((stream), (sid))->mid = mid + 1)
422 	(sctp_stream_##type((stream), (sid))->mid_uo)
426 	(sctp_stream_##type((stream), (sid))->mid_uo++)
542  * a chunk header and chunk-specific content.
556 		/* This is our link to the per-transport transmitted list.  */
637 	/* SCTP-AUTH:  For the special case inbound processing of COOKIE-ECHO
638 	 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH
664 #define sctp_chunk_retransmitted(chunk)	(chunk->sent_count > 1)
680 	return ntohs(ch->subh.data_hdr->stream);  in sctp_chunk_stream_no()
728 	u8  has_cookie_echo:1,	/* This packet contains a COOKIE-ECHO chunk. */
748 	return packet->size == packet->overhead;  in sctp_packet_empty()
766  *	source-destination pair but for each destination).  The parameters
778 		/* RTO-Pending : A flag used to track if one of the DATA
926 	 * [Everywhere else in the text this is called T3-rtx. -ed]
942 	/* Since we're using per-destination retransmission timers
943 	 * (see above), we're also using per-destination "transmitted"
949 	/* We build bundle-able packets for this transport here.  */
957 	 * per-destination basis when a changeover happens.
992 	/* 64-bit random number sent with heartbeat. */
1081 	struct sctp_sched_ops *sched;  member
1106 	/* How many unackd bytes do we have in-flight?	*/
1109 	/* Are we doing fast-rtx on this queue */
1132 	q->cork = 1;  in sctp_outq_cork()
1136  * sctp_input_cb is currently used on rx and sock rx queue
1149 #define SCTP_INPUT_CB(__skb)	((struct sctp_input_cb *)&((__skb)->cb[0]))
1154 #define SCTP_OUTPUT_CB(__skb)	((struct sctp_output_cb *)&((__skb)->cb[0]))
1158 	const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk;  in sctp_gso_headskb()
1160 	return chunk->head_skb ? : skb;  in sctp_gso_headskb()
1200 int sctp_bind_addrs_check(struct sctp_sock *sp,
1246 	 *   refcnt   - Reference count access to this object.
1247 	 *   dead     - Do not attempt to use this object.
1273  *   multi-homed host, an SCTP endpoint is represented to its peers as a
1284  * A TCP-style socket will have exactly one association on one of
1285  * these.  An UDP-style socket will have multiple associations hanging
1320  	 * 	    this here so we pre-allocate this once and can re-use
1336 	/* SCTP-AUTH: hmacs for the endpoint encoded into parameter */
1339 	/* SCTP-AUTH: chunks to authenticate encoded into parameter */
1342 	/* SCTP-AUTH: endpoint shared keys */
1489 	return genradix_ptr(&stream->out, sid);  in sctp_stream_out()
1496 	return genradix_ptr(&stream->in, sid);  in sctp_stream_in()
1507 	return stream->si->data_chunk_len;  in sctp_datachk_len()
1512 	return stream->si->data_chunk_len - sizeof(struct sctp_chunkhdr);  in sctp_datahdr_len()
1517 	return stream->si->ftsn_chunk_len;  in sctp_ftsnchk_len()
1522 	return stream->si->ftsn_chunk_len - sizeof(struct sctp_chunkhdr);  in sctp_ftsnhdr_len()
1662 		 * RFC2960 6.4 Multi-homed SCTP Endpoints
1664 		 * Furthermore, when its peer is multi-homed, an
1696 		 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn().
1710 			prsctp_capable:1,   /* Can peer do PR-SCTP? */
1711 			reconf_capable:1,   /* Can peer do RE-CONFIG? */
1713 			auth_capable:1,     /* Is peer doing SCTP-AUTH? */
1738 		 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the
1743 		/* SCTP-AUTH: We need to know pears random number, hmac list
1753 	 *	       : association is in, i.e. COOKIE-WAIT,
1754 	 *	       : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING,
1755 	 *	       : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT.
1873 	/* PR-SCTP Advanced.Peer.Ack.Point */
1916 	 * as specified in the sk->sndbuf.
1973 	 * <draft-ietf-tsvwg-addip-sctp-02.txt>
1984 	 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
1987 	 * so at any time two ASCONF may be in-transit on any given
1990 	 * [This is our one-and-only-one ASCONF in flight.  If we do
1997 	 * This is needed to implement items E1 - E4 of the updated
2023 	 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk
2026 	 * so at any time two ASCONF may be in-transit on any given
2032 	 *  queue and its supporting logic down there.	--piggy]
2053 	 * 4294967295 (2^32 - 1).  Serial Numbers wrap back to 0