^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* SCTP kernel implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * (C) Copyright IBM Corp. 2001, 2004
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) 1999-2000 Cisco, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 1999-2001 Motorola, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (c) 2001-2003 Intel Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * This file is part of the SCTP kernel implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * These functions implement the sctp_outq class. The outqueue handles
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * bundling and queueing of outgoing SCTP chunks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * Please send any bug reports or fixes you make to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * email address(es):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * lksctp developers <linux-sctp@vger.kernel.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Written or modified by:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * La Monte H.P. Yarroll <piggy@acm.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Karl Knutson <karl@athena.chicago.il.us>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * Perry Melange <pmelange@null.cc.uic.edu>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * Xingang Guo <xingang.guo@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * Hui Huang <hui.huang@nokia.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * Sridhar Samudrala <sri@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * Jon Grimm <jgrimm@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/list.h> /* For struct list_head */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <net/sock.h> /* For skb_set_owner_w */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <net/sctp/sctp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <net/sctp/sm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <net/sctp/stream_sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <trace/events/sctp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /* Declare internal functions here. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static int sctp_acked(struct sctp_sackhdr *sack, __u32 tsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static void sctp_check_transmitted(struct sctp_outq *q,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct list_head *transmitted_queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct sctp_transport *transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) union sctp_addr *saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct sctp_sackhdr *sack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) __u32 *highest_new_tsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static void sctp_mark_missing(struct sctp_outq *q,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct list_head *transmitted_queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct sctp_transport *transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) __u32 highest_new_tsn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) int count_of_newacks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /* Add data to the front of the queue. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) static inline void sctp_outq_head_data(struct sctp_outq *q,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct sctp_chunk *ch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct sctp_stream_out_ext *oute;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) __u16 stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) list_add(&ch->list, &q->out_chunk_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) q->out_qlen += ch->skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) stream = sctp_chunk_stream_no(ch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) oute = SCTP_SO(&q->asoc->stream, stream)->ext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) list_add(&ch->stream_list, &oute->outq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) /* Take data from the front of the queue. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static inline struct sctp_chunk *sctp_outq_dequeue_data(struct sctp_outq *q)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return q->sched->dequeue(q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) /* Add data chunk to the end of the queue. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static inline void sctp_outq_tail_data(struct sctp_outq *q,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) struct sctp_chunk *ch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct sctp_stream_out_ext *oute;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) __u16 stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) list_add_tail(&ch->list, &q->out_chunk_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) q->out_qlen += ch->skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) stream = sctp_chunk_stream_no(ch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) oute = SCTP_SO(&q->asoc->stream, stream)->ext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) list_add_tail(&ch->stream_list, &oute->outq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * SFR-CACC algorithm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * D) If count_of_newacks is greater than or equal to 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * and t was not sent to the current primary then the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * sender MUST NOT increment missing report count for t.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static inline int sctp_cacc_skip_3_1_d(struct sctp_transport *primary,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) struct sctp_transport *transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) int count_of_newacks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (count_of_newacks >= 2 && transport != primary)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * SFR-CACC algorithm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * F) If count_of_newacks is less than 2, let d be the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * destination to which t was sent. If cacc_saw_newack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) * is 0 for destination d, then the sender MUST NOT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * increment missing report count for t.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static inline int sctp_cacc_skip_3_1_f(struct sctp_transport *transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) int count_of_newacks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (count_of_newacks < 2 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) (transport && !transport->cacc.cacc_saw_newack))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * SFR-CACC algorithm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * 3.1) If CYCLING_CHANGEOVER is 0, the sender SHOULD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * execute steps C, D, F.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * C has been implemented in sctp_outq_sack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static inline int sctp_cacc_skip_3_1(struct sctp_transport *primary,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) struct sctp_transport *transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) int count_of_newacks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (!primary->cacc.cycling_changeover) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (sctp_cacc_skip_3_1_d(primary, transport, count_of_newacks))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (sctp_cacc_skip_3_1_f(transport, count_of_newacks))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * SFR-CACC algorithm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) * 3.2) Else if CYCLING_CHANGEOVER is 1, and t is less
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) * than next_tsn_at_change of the current primary, then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * the sender MUST NOT increment missing report count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) * for t.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static inline int sctp_cacc_skip_3_2(struct sctp_transport *primary, __u32 tsn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (primary->cacc.cycling_changeover &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) TSN_lt(tsn, primary->cacc.next_tsn_at_change))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) * SFR-CACC algorithm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * 3) If the missing report count for TSN t is to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * incremented according to [RFC2960] and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * [SCTP_STEWART-2002], and CHANGEOVER_ACTIVE is set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * then the sender MUST further execute steps 3.1 and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) * 3.2 to determine if the missing report count for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * TSN t SHOULD NOT be incremented.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * 3.3) If 3.1 and 3.2 do not dictate that the missing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * report count for t should not be incremented, then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) * the sender SHOULD increment missing report count for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * t (according to [RFC2960] and [SCTP_STEWART_2002]).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static inline int sctp_cacc_skip(struct sctp_transport *primary,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) struct sctp_transport *transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) int count_of_newacks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) __u32 tsn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) if (primary->cacc.changeover_active &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) (sctp_cacc_skip_3_1(primary, transport, count_of_newacks) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) sctp_cacc_skip_3_2(primary, tsn)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) /* Initialize an existing sctp_outq. This does the boring stuff.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) * You still need to define handlers if you really want to DO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * something with this structure...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) void sctp_outq_init(struct sctp_association *asoc, struct sctp_outq *q)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) memset(q, 0, sizeof(struct sctp_outq));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) q->asoc = asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) INIT_LIST_HEAD(&q->out_chunk_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) INIT_LIST_HEAD(&q->control_chunk_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) INIT_LIST_HEAD(&q->retransmit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) INIT_LIST_HEAD(&q->sacked);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) INIT_LIST_HEAD(&q->abandoned);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) sctp_sched_set_sched(asoc, sctp_sk(asoc->base.sk)->default_ss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) /* Free the outqueue structure and any related pending chunks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) static void __sctp_outq_teardown(struct sctp_outq *q)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) struct sctp_transport *transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) struct list_head *lchunk, *temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) struct sctp_chunk *chunk, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) /* Throw away unacknowledged chunks. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) list_for_each_entry(transport, &q->asoc->peer.transport_addr_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) transports) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) while ((lchunk = sctp_list_dequeue(&transport->transmitted)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) chunk = list_entry(lchunk, struct sctp_chunk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) transmitted_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) /* Mark as part of a failed message. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) sctp_chunk_fail(chunk, q->error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) sctp_chunk_free(chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) /* Throw away chunks that have been gap ACKed. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) list_for_each_safe(lchunk, temp, &q->sacked) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) list_del_init(lchunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) chunk = list_entry(lchunk, struct sctp_chunk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) transmitted_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) sctp_chunk_fail(chunk, q->error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) sctp_chunk_free(chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) /* Throw away any chunks in the retransmit queue. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) list_for_each_safe(lchunk, temp, &q->retransmit) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) list_del_init(lchunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) chunk = list_entry(lchunk, struct sctp_chunk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) transmitted_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) sctp_chunk_fail(chunk, q->error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) sctp_chunk_free(chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) /* Throw away any chunks that are in the abandoned queue. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) list_for_each_safe(lchunk, temp, &q->abandoned) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) list_del_init(lchunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) chunk = list_entry(lchunk, struct sctp_chunk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) transmitted_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) sctp_chunk_fail(chunk, q->error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) sctp_chunk_free(chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) /* Throw away any leftover data chunks. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) while ((chunk = sctp_outq_dequeue_data(q)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) sctp_sched_dequeue_done(q, chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) /* Mark as send failure. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) sctp_chunk_fail(chunk, q->error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) sctp_chunk_free(chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) /* Throw away any leftover control chunks. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) list_for_each_entry_safe(chunk, tmp, &q->control_chunk_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) list_del_init(&chunk->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) sctp_chunk_free(chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) void sctp_outq_teardown(struct sctp_outq *q)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) __sctp_outq_teardown(q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) sctp_outq_init(q->asoc, q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) /* Free the outqueue structure and any related pending chunks. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) void sctp_outq_free(struct sctp_outq *q)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) /* Throw away leftover chunks. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) __sctp_outq_teardown(q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) /* Put a new chunk in an sctp_outq. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) void sctp_outq_tail(struct sctp_outq *q, struct sctp_chunk *chunk, gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) struct net *net = q->asoc->base.net;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) pr_debug("%s: outq:%p, chunk:%p[%s]\n", __func__, q, chunk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) chunk && chunk->chunk_hdr ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type)) :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) "illegal chunk");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) /* If it is data, queue it up, otherwise, send it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) * immediately.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) if (sctp_chunk_is_data(chunk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) pr_debug("%s: outqueueing: outq:%p, chunk:%p[%s])\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) __func__, q, chunk, chunk && chunk->chunk_hdr ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type)) :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) "illegal chunk");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) sctp_outq_tail_data(q, chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) if (chunk->asoc->peer.prsctp_capable &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) SCTP_PR_PRIO_ENABLED(chunk->sinfo.sinfo_flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) chunk->asoc->sent_cnt_removable++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) SCTP_INC_STATS(net, SCTP_MIB_OUTUNORDERCHUNKS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) SCTP_INC_STATS(net, SCTP_MIB_OUTORDERCHUNKS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) list_add_tail(&chunk->list, &q->control_chunk_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) if (!q->cork)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) sctp_outq_flush(q, 0, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) /* Insert a chunk into the sorted list based on the TSNs. The retransmit list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) * and the abandoned list are in ascending order.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) static void sctp_insert_list(struct list_head *head, struct list_head *new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) struct list_head *pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) struct sctp_chunk *nchunk, *lchunk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) __u32 ntsn, ltsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) int done = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) nchunk = list_entry(new, struct sctp_chunk, transmitted_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) ntsn = ntohl(nchunk->subh.data_hdr->tsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) list_for_each(pos, head) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) lchunk = list_entry(pos, struct sctp_chunk, transmitted_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) ltsn = ntohl(lchunk->subh.data_hdr->tsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) if (TSN_lt(ntsn, ltsn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) list_add(new, pos->prev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) done = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) if (!done)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) list_add_tail(new, head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) static int sctp_prsctp_prune_sent(struct sctp_association *asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) struct sctp_sndrcvinfo *sinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) struct list_head *queue, int msg_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) struct sctp_chunk *chk, *temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) list_for_each_entry_safe(chk, temp, queue, transmitted_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) struct sctp_stream_out *streamout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) if (!chk->msg->abandoned &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) (!SCTP_PR_PRIO_ENABLED(chk->sinfo.sinfo_flags) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) chk->sinfo.sinfo_timetolive <= sinfo->sinfo_timetolive))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) chk->msg->abandoned = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) list_del_init(&chk->transmitted_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) sctp_insert_list(&asoc->outqueue.abandoned,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) &chk->transmitted_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) streamout = SCTP_SO(&asoc->stream, chk->sinfo.sinfo_stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) asoc->sent_cnt_removable--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) asoc->abandoned_sent[SCTP_PR_INDEX(PRIO)]++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) streamout->ext->abandoned_sent[SCTP_PR_INDEX(PRIO)]++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) if (queue != &asoc->outqueue.retransmit &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) !chk->tsn_gap_acked) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) if (chk->transport)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) chk->transport->flight_size -=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) sctp_data_size(chk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) asoc->outqueue.outstanding_bytes -= sctp_data_size(chk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) msg_len -= chk->skb->truesize + sizeof(struct sctp_chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) if (msg_len <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) return msg_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) static int sctp_prsctp_prune_unsent(struct sctp_association *asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) struct sctp_sndrcvinfo *sinfo, int msg_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) struct sctp_outq *q = &asoc->outqueue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) struct sctp_chunk *chk, *temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) q->sched->unsched_all(&asoc->stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) list_for_each_entry_safe(chk, temp, &q->out_chunk_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) if (!chk->msg->abandoned &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) (!(chk->chunk_hdr->flags & SCTP_DATA_FIRST_FRAG) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) !SCTP_PR_PRIO_ENABLED(chk->sinfo.sinfo_flags) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) chk->sinfo.sinfo_timetolive <= sinfo->sinfo_timetolive))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) chk->msg->abandoned = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) sctp_sched_dequeue_common(q, chk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) asoc->sent_cnt_removable--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) asoc->abandoned_unsent[SCTP_PR_INDEX(PRIO)]++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) if (chk->sinfo.sinfo_stream < asoc->stream.outcnt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) struct sctp_stream_out *streamout =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) SCTP_SO(&asoc->stream, chk->sinfo.sinfo_stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) streamout->ext->abandoned_unsent[SCTP_PR_INDEX(PRIO)]++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) msg_len -= chk->skb->truesize + sizeof(struct sctp_chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) sctp_chunk_free(chk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) if (msg_len <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) q->sched->sched_all(&asoc->stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) return msg_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) /* Abandon the chunks according their priorities */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) void sctp_prsctp_prune(struct sctp_association *asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) struct sctp_sndrcvinfo *sinfo, int msg_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) struct sctp_transport *transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) if (!asoc->peer.prsctp_capable || !asoc->sent_cnt_removable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) msg_len = sctp_prsctp_prune_sent(asoc, sinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) &asoc->outqueue.retransmit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) msg_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) if (msg_len <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) list_for_each_entry(transport, &asoc->peer.transport_addr_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) transports) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) msg_len = sctp_prsctp_prune_sent(asoc, sinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) &transport->transmitted,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) msg_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (msg_len <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) sctp_prsctp_prune_unsent(asoc, sinfo, msg_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) /* Mark all the eligible packets on a transport for retransmission. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) void sctp_retransmit_mark(struct sctp_outq *q,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) struct sctp_transport *transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) __u8 reason)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) struct list_head *lchunk, *ltemp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) struct sctp_chunk *chunk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) /* Walk through the specified transmitted queue. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) list_for_each_safe(lchunk, ltemp, &transport->transmitted) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) chunk = list_entry(lchunk, struct sctp_chunk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) transmitted_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) /* If the chunk is abandoned, move it to abandoned list. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) if (sctp_chunk_abandoned(chunk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) list_del_init(lchunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) sctp_insert_list(&q->abandoned, lchunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) /* If this chunk has not been previousely acked,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) * stop considering it 'outstanding'. Our peer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) * will most likely never see it since it will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) * not be retransmitted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) if (!chunk->tsn_gap_acked) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) if (chunk->transport)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) chunk->transport->flight_size -=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) sctp_data_size(chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) q->outstanding_bytes -= sctp_data_size(chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) q->asoc->peer.rwnd += sctp_data_size(chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) /* If we are doing retransmission due to a timeout or pmtu
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) * discovery, only the chunks that are not yet acked should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) * be added to the retransmit queue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if ((reason == SCTP_RTXR_FAST_RTX &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) (chunk->fast_retransmit == SCTP_NEED_FRTX)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) (reason != SCTP_RTXR_FAST_RTX && !chunk->tsn_gap_acked)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) /* RFC 2960 6.2.1 Processing a Received SACK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) * C) Any time a DATA chunk is marked for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) * retransmission (via either T3-rtx timer expiration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) * (Section 6.3.3) or via fast retransmit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) * (Section 7.2.4)), add the data size of those
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) * chunks to the rwnd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) q->asoc->peer.rwnd += sctp_data_size(chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) q->outstanding_bytes -= sctp_data_size(chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) if (chunk->transport)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) transport->flight_size -= sctp_data_size(chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) /* sctpimpguide-05 Section 2.8.2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) * M5) If a T3-rtx timer expires, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) * 'TSN.Missing.Report' of all affected TSNs is set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) * to 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) chunk->tsn_missing_report = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) /* If a chunk that is being used for RTT measurement
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) * has to be retransmitted, we cannot use this chunk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) * anymore for RTT measurements. Reset rto_pending so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) * that a new RTT measurement is started when a new
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) * data chunk is sent.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) if (chunk->rtt_in_progress) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) chunk->rtt_in_progress = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) transport->rto_pending = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) /* Move the chunk to the retransmit queue. The chunks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) * on the retransmit queue are always kept in order.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) list_del_init(lchunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) sctp_insert_list(&q->retransmit, lchunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) pr_debug("%s: transport:%p, reason:%d, cwnd:%d, ssthresh:%d, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) "flight_size:%d, pba:%d\n", __func__, transport, reason,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) transport->cwnd, transport->ssthresh, transport->flight_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) transport->partial_bytes_acked);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) /* Mark all the eligible packets on a transport for retransmission and force
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) * one packet out.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) enum sctp_retransmit_reason reason)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) struct net *net = q->asoc->base.net;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) switch (reason) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) case SCTP_RTXR_T3_RTX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) SCTP_INC_STATS(net, SCTP_MIB_T3_RETRANSMITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) sctp_transport_lower_cwnd(transport, SCTP_LOWER_CWND_T3_RTX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) /* Update the retran path if the T3-rtx timer has expired for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) * the current retran path.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) if (transport == transport->asoc->peer.retran_path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) sctp_assoc_update_retran_path(transport->asoc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) transport->asoc->rtx_data_chunks +=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) transport->asoc->unack_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) case SCTP_RTXR_FAST_RTX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) SCTP_INC_STATS(net, SCTP_MIB_FAST_RETRANSMITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) sctp_transport_lower_cwnd(transport, SCTP_LOWER_CWND_FAST_RTX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) q->fast_rtx = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) case SCTP_RTXR_PMTUD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) SCTP_INC_STATS(net, SCTP_MIB_PMTUD_RETRANSMITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) case SCTP_RTXR_T1_RTX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) SCTP_INC_STATS(net, SCTP_MIB_T1_RETRANSMITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) transport->asoc->init_retries++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) sctp_retransmit_mark(q, transport, reason);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) /* PR-SCTP A5) Any time the T3-rtx timer expires, on any destination,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) * the sender SHOULD try to advance the "Advanced.Peer.Ack.Point" by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) * following the procedures outlined in C1 - C5.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) if (reason == SCTP_RTXR_T3_RTX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) q->asoc->stream.si->generate_ftsn(q, q->asoc->ctsn_ack_point);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) /* Flush the queues only on timeout, since fast_rtx is only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) * triggered during sack processing and the queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) * will be flushed at the end.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) if (reason != SCTP_RTXR_FAST_RTX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) sctp_outq_flush(q, /* rtx_timeout */ 1, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) * Transmit DATA chunks on the retransmit queue. Upon return from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) * __sctp_outq_flush_rtx() the packet 'pkt' may contain chunks which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) * need to be transmitted by the caller.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) * We assume that pkt->transport has already been set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) * The return value is a normal kernel error return value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) static int __sctp_outq_flush_rtx(struct sctp_outq *q, struct sctp_packet *pkt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) int rtx_timeout, int *start_timer, gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) struct sctp_transport *transport = pkt->transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) struct sctp_chunk *chunk, *chunk1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) struct list_head *lqueue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) enum sctp_xmit status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) int timer = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) int done = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) int fast_rtx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) lqueue = &q->retransmit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) fast_rtx = q->fast_rtx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) /* This loop handles time-out retransmissions, fast retransmissions,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) * and retransmissions due to opening of whindow.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) * RFC 2960 6.3.3 Handle T3-rtx Expiration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) * E3) Determine how many of the earliest (i.e., lowest TSN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) * outstanding DATA chunks for the address for which the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) * T3-rtx has expired will fit into a single packet, subject
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) * to the MTU constraint for the path corresponding to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) * destination transport address to which the retransmission
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) * is being sent (this may be different from the address for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) * which the timer expires [see Section 6.4]). Call this value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) * K. Bundle and retransmit those K DATA chunks in a single
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) * packet to the destination endpoint.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) * [Just to be painfully clear, if we are retransmitting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) * because a timeout just happened, we should send only ONE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) * packet of retransmitted data.]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) * For fast retransmissions we also send only ONE packet. However,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) * if we are just flushing the queue due to open window, we'll
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) * try to send as much as possible.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) list_for_each_entry_safe(chunk, chunk1, lqueue, transmitted_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) /* If the chunk is abandoned, move it to abandoned list. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) if (sctp_chunk_abandoned(chunk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) list_del_init(&chunk->transmitted_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) sctp_insert_list(&q->abandoned,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) &chunk->transmitted_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) /* Make sure that Gap Acked TSNs are not retransmitted. A
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) * simple approach is just to move such TSNs out of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) * way and into a 'transmitted' queue and skip to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) * next chunk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) if (chunk->tsn_gap_acked) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) list_move_tail(&chunk->transmitted_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) &transport->transmitted);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) /* If we are doing fast retransmit, ignore non-fast_rtransmit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) * chunks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) if (fast_rtx && !chunk->fast_retransmit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) redo:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) /* Attempt to append this chunk to the packet. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) status = sctp_packet_append_chunk(pkt, chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) switch (status) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) case SCTP_XMIT_PMTU_FULL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) if (!pkt->has_data && !pkt->has_cookie_echo) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) /* If this packet did not contain DATA then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) * retransmission did not happen, so do it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) * again. We'll ignore the error here since
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) * control chunks are already freed so there
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) * is nothing we can do.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) sctp_packet_transmit(pkt, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) goto redo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) /* Send this packet. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) error = sctp_packet_transmit(pkt, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) /* If we are retransmitting, we should only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) * send a single packet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) * Otherwise, try appending this chunk again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) if (rtx_timeout || fast_rtx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) done = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) goto redo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) /* Bundle next chunk in the next round. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) case SCTP_XMIT_RWND_FULL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) /* Send this packet. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) error = sctp_packet_transmit(pkt, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) /* Stop sending DATA as there is no more room
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) * at the receiver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) done = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) case SCTP_XMIT_DELAY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) /* Send this packet. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) error = sctp_packet_transmit(pkt, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) /* Stop sending DATA because of nagle delay. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) done = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) /* The append was successful, so add this chunk to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) * the transmitted list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) list_move_tail(&chunk->transmitted_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) &transport->transmitted);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) /* Mark the chunk as ineligible for fast retransmit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) * after it is retransmitted.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) if (chunk->fast_retransmit == SCTP_NEED_FRTX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) chunk->fast_retransmit = SCTP_DONT_FRTX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) q->asoc->stats.rtxchunks++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) /* Set the timer if there were no errors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) if (!error && !timer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) timer = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) if (done)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) /* If we are here due to a retransmit timeout or a fast
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) * retransmit and if there are any chunks left in the retransmit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) * queue that could not fit in the PMTU sized packet, they need
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) * to be marked as ineligible for a subsequent fast retransmit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) if (rtx_timeout || fast_rtx) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) list_for_each_entry(chunk1, lqueue, transmitted_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) if (chunk1->fast_retransmit == SCTP_NEED_FRTX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) chunk1->fast_retransmit = SCTP_DONT_FRTX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) *start_timer = timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) /* Clear fast retransmit hint */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) if (fast_rtx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) q->fast_rtx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) /* Cork the outqueue so queued chunks are really queued. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) void sctp_outq_uncork(struct sctp_outq *q, gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) if (q->cork)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) q->cork = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) sctp_outq_flush(q, 0, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) static int sctp_packet_singleton(struct sctp_transport *transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) struct sctp_chunk *chunk, gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) const struct sctp_association *asoc = transport->asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) const __u16 sport = asoc->base.bind_addr.port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) const __u16 dport = asoc->peer.port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) const __u32 vtag = asoc->peer.i.init_tag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) struct sctp_packet singleton;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) sctp_packet_init(&singleton, transport, sport, dport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) sctp_packet_config(&singleton, vtag, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) sctp_packet_append_chunk(&singleton, chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) return sctp_packet_transmit(&singleton, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) /* Struct to hold the context during sctp outq flush */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) struct sctp_flush_ctx {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) struct sctp_outq *q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) /* Current transport being used. It's NOT the same as curr active one */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) struct sctp_transport *transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) /* These transports have chunks to send. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) struct list_head transport_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) struct sctp_association *asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) /* Packet on the current transport above */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) struct sctp_packet *packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) gfp_t gfp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) /* transport: current transport */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) static void sctp_outq_select_transport(struct sctp_flush_ctx *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) struct sctp_chunk *chunk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) struct sctp_transport *new_transport = chunk->transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) if (!new_transport) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) if (!sctp_chunk_is_data(chunk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) /* If we have a prior transport pointer, see if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) * the destination address of the chunk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) * matches the destination address of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) * current transport. If not a match, then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) * try to look up the transport with a given
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) * destination address. We do this because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) * after processing ASCONFs, we may have new
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) * transports created.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) if (ctx->transport && sctp_cmp_addr_exact(&chunk->dest,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) &ctx->transport->ipaddr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) new_transport = ctx->transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) new_transport = sctp_assoc_lookup_paddr(ctx->asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) &chunk->dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) /* if we still don't have a new transport, then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) * use the current active path.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) if (!new_transport)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) new_transport = ctx->asoc->peer.active_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) __u8 type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) switch (new_transport->state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) case SCTP_INACTIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) case SCTP_UNCONFIRMED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) case SCTP_PF:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) /* If the chunk is Heartbeat or Heartbeat Ack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) * send it to chunk->transport, even if it's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) * inactive.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) * 3.3.6 Heartbeat Acknowledgement:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) * ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) * A HEARTBEAT ACK is always sent to the source IP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) * address of the IP datagram containing the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) * HEARTBEAT chunk to which this ack is responding.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) * ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) * ASCONF_ACKs also must be sent to the source.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) type = chunk->chunk_hdr->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) if (type != SCTP_CID_HEARTBEAT &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) type != SCTP_CID_HEARTBEAT_ACK &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) type != SCTP_CID_ASCONF_ACK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) new_transport = ctx->asoc->peer.active_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) /* Are we switching transports? Take care of transport locks. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) if (new_transport != ctx->transport) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) ctx->transport = new_transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) ctx->packet = &ctx->transport->packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) if (list_empty(&ctx->transport->send_ready))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) list_add_tail(&ctx->transport->send_ready,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) &ctx->transport_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) sctp_packet_config(ctx->packet,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) ctx->asoc->peer.i.init_tag,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) ctx->asoc->peer.ecn_capable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) /* We've switched transports, so apply the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) * Burst limit to the new transport.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) sctp_transport_burst_limited(ctx->transport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) static void sctp_outq_flush_ctrl(struct sctp_flush_ctx *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) struct sctp_chunk *chunk, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) enum sctp_xmit status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) int one_packet, error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) list_for_each_entry_safe(chunk, tmp, &ctx->q->control_chunk_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) one_packet = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) /* RFC 5061, 5.3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) * F1) This means that until such time as the ASCONF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) * containing the add is acknowledged, the sender MUST
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) * NOT use the new IP address as a source for ANY SCTP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) * packet except on carrying an ASCONF Chunk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) if (ctx->asoc->src_out_of_asoc_ok &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) chunk->chunk_hdr->type != SCTP_CID_ASCONF)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) list_del_init(&chunk->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) /* Pick the right transport to use. Should always be true for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) * the first chunk as we don't have a transport by then.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) sctp_outq_select_transport(ctx, chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) switch (chunk->chunk_hdr->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) /* 6.10 Bundling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) * ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) * An endpoint MUST NOT bundle INIT, INIT ACK or SHUTDOWN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) * COMPLETE with any other chunks. [Send them immediately.]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) case SCTP_CID_INIT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) case SCTP_CID_INIT_ACK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) case SCTP_CID_SHUTDOWN_COMPLETE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) error = sctp_packet_singleton(ctx->transport, chunk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) ctx->gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) if (error < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) ctx->asoc->base.sk->sk_err = -error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) case SCTP_CID_ABORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) if (sctp_test_T_bit(chunk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) ctx->packet->vtag = ctx->asoc->c.my_vtag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) /* The following chunks are "response" chunks, i.e.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) * they are generated in response to something we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) * received. If we are sending these, then we can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) * send only 1 packet containing these chunks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) case SCTP_CID_HEARTBEAT_ACK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) case SCTP_CID_SHUTDOWN_ACK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) case SCTP_CID_COOKIE_ACK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) case SCTP_CID_COOKIE_ECHO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) case SCTP_CID_ERROR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) case SCTP_CID_ECN_CWR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) case SCTP_CID_ASCONF_ACK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) one_packet = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) case SCTP_CID_SACK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) case SCTP_CID_HEARTBEAT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) case SCTP_CID_SHUTDOWN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) case SCTP_CID_ECN_ECNE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) case SCTP_CID_ASCONF:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) case SCTP_CID_FWD_TSN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) case SCTP_CID_I_FWD_TSN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) case SCTP_CID_RECONF:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) status = sctp_packet_transmit_chunk(ctx->packet, chunk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) one_packet, ctx->gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) if (status != SCTP_XMIT_OK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) /* put the chunk back */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) list_add(&chunk->list, &ctx->q->control_chunk_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) ctx->asoc->stats.octrlchunks++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) /* PR-SCTP C5) If a FORWARD TSN is sent, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) * sender MUST assure that at least one T3-rtx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) * timer is running.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) if (chunk->chunk_hdr->type == SCTP_CID_FWD_TSN ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) chunk->chunk_hdr->type == SCTP_CID_I_FWD_TSN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) sctp_transport_reset_t3_rtx(ctx->transport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) ctx->transport->last_time_sent = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) if (chunk == ctx->asoc->strreset_chunk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) sctp_transport_reset_reconf_timer(ctx->transport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) /* We built a chunk with an illegal type! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) /* Returns false if new data shouldn't be sent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) static bool sctp_outq_flush_rtx(struct sctp_flush_ctx *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) int rtx_timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) int error, start_timer = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) if (ctx->asoc->peer.retran_path->state == SCTP_UNCONFIRMED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) if (ctx->transport != ctx->asoc->peer.retran_path) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) /* Switch transports & prepare the packet. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) ctx->transport = ctx->asoc->peer.retran_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) ctx->packet = &ctx->transport->packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) if (list_empty(&ctx->transport->send_ready))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) list_add_tail(&ctx->transport->send_ready,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) &ctx->transport_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) sctp_packet_config(ctx->packet, ctx->asoc->peer.i.init_tag,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) ctx->asoc->peer.ecn_capable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) error = __sctp_outq_flush_rtx(ctx->q, ctx->packet, rtx_timeout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) &start_timer, ctx->gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) if (error < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) ctx->asoc->base.sk->sk_err = -error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) if (start_timer) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) sctp_transport_reset_t3_rtx(ctx->transport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) ctx->transport->last_time_sent = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) /* This can happen on COOKIE-ECHO resend. Only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) * one chunk can get bundled with a COOKIE-ECHO.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) if (ctx->packet->has_cookie_echo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) /* Don't send new data if there is still data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) * waiting to retransmit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) if (!list_empty(&ctx->q->retransmit))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) static void sctp_outq_flush_data(struct sctp_flush_ctx *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) int rtx_timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) struct sctp_chunk *chunk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) enum sctp_xmit status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) /* Is it OK to send data chunks? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) switch (ctx->asoc->state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) case SCTP_STATE_COOKIE_ECHOED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) /* Only allow bundling when this packet has a COOKIE-ECHO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) * chunk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) if (!ctx->packet || !ctx->packet->has_cookie_echo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) case SCTP_STATE_ESTABLISHED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) case SCTP_STATE_SHUTDOWN_PENDING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) case SCTP_STATE_SHUTDOWN_RECEIVED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) /* Do nothing. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) /* RFC 2960 6.1 Transmission of DATA Chunks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) * C) When the time comes for the sender to transmit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) * before sending new DATA chunks, the sender MUST
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) * first transmit any outstanding DATA chunks which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) * are marked for retransmission (limited by the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) * current cwnd).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) if (!list_empty(&ctx->q->retransmit) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) !sctp_outq_flush_rtx(ctx, rtx_timeout))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) /* Apply Max.Burst limitation to the current transport in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) * case it will be used for new data. We are going to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) * rest it before we return, but we want to apply the limit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) * to the currently queued data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) if (ctx->transport)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) sctp_transport_burst_limited(ctx->transport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) /* Finally, transmit new packets. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) while ((chunk = sctp_outq_dequeue_data(ctx->q)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) __u32 sid = ntohs(chunk->subh.data_hdr->stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) __u8 stream_state = SCTP_SO(&ctx->asoc->stream, sid)->state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) /* Has this chunk expired? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) if (sctp_chunk_abandoned(chunk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) sctp_sched_dequeue_done(ctx->q, chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) sctp_chunk_fail(chunk, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) sctp_chunk_free(chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) if (stream_state == SCTP_STREAM_CLOSED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) sctp_outq_head_data(ctx->q, chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) sctp_outq_select_transport(ctx, chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) pr_debug("%s: outq:%p, chunk:%p[%s], tx-tsn:0x%x skb->head:%p skb->users:%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) __func__, ctx->q, chunk, chunk && chunk->chunk_hdr ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type)) :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) "illegal chunk", ntohl(chunk->subh.data_hdr->tsn),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) chunk->skb ? chunk->skb->head : NULL, chunk->skb ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) refcount_read(&chunk->skb->users) : -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) /* Add the chunk to the packet. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) status = sctp_packet_transmit_chunk(ctx->packet, chunk, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) ctx->gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) if (status != SCTP_XMIT_OK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) /* We could not append this chunk, so put
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) * the chunk back on the output queue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) pr_debug("%s: could not transmit tsn:0x%x, status:%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) __func__, ntohl(chunk->subh.data_hdr->tsn),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) sctp_outq_head_data(ctx->q, chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) /* The sender is in the SHUTDOWN-PENDING state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) * The sender MAY set the I-bit in the DATA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) * chunk header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) if (ctx->asoc->state == SCTP_STATE_SHUTDOWN_PENDING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) chunk->chunk_hdr->flags |= SCTP_DATA_SACK_IMM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) ctx->asoc->stats.ouodchunks++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) ctx->asoc->stats.oodchunks++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) /* Only now it's safe to consider this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) * chunk as sent, sched-wise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) sctp_sched_dequeue_done(ctx->q, chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) list_add_tail(&chunk->transmitted_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) &ctx->transport->transmitted);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) sctp_transport_reset_t3_rtx(ctx->transport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) ctx->transport->last_time_sent = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) /* Only let one DATA chunk get bundled with a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) * COOKIE-ECHO chunk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) if (ctx->packet->has_cookie_echo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) static void sctp_outq_flush_transports(struct sctp_flush_ctx *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) struct list_head *ltransport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) struct sctp_packet *packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) struct sctp_transport *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) while ((ltransport = sctp_list_dequeue(&ctx->transport_list)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) t = list_entry(ltransport, struct sctp_transport, send_ready);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) packet = &t->packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) if (!sctp_packet_empty(packet)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) error = sctp_packet_transmit(packet, ctx->gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) if (error < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) ctx->q->asoc->base.sk->sk_err = -error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) /* Clear the burst limited state, if any */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) sctp_transport_burst_reset(t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) /* Try to flush an outqueue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) * Description: Send everything in q which we legally can, subject to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) * congestion limitations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) * * Note: This function can be called from multiple contexts so appropriate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) * locking concerns must be made. Today we use the sock lock to protect
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) * this function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) struct sctp_flush_ctx ctx = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) .q = q,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) .transport = NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) .transport_list = LIST_HEAD_INIT(ctx.transport_list),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) .asoc = q->asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) .packet = NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) .gfp = gfp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) /* 6.10 Bundling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) * ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) * When bundling control chunks with DATA chunks, an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) * endpoint MUST place control chunks first in the outbound
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) * SCTP packet. The transmitter MUST transmit DATA chunks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) * within a SCTP packet in increasing order of TSN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) * ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) sctp_outq_flush_ctrl(&ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) if (q->asoc->src_out_of_asoc_ok)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) goto sctp_flush_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) sctp_outq_flush_data(&ctx, rtx_timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) sctp_flush_out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) sctp_outq_flush_transports(&ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) /* Update unack_data based on the incoming SACK chunk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) static void sctp_sack_update_unack_data(struct sctp_association *assoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) struct sctp_sackhdr *sack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) union sctp_sack_variable *frags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) __u16 unack_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) unack_data = assoc->next_tsn - assoc->ctsn_ack_point - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) frags = sack->variable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) for (i = 0; i < ntohs(sack->num_gap_ack_blocks); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) unack_data -= ((ntohs(frags[i].gab.end) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) ntohs(frags[i].gab.start) + 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) assoc->unack_data = unack_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) /* This is where we REALLY process a SACK.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) * Process the SACK against the outqueue. Mostly, this just frees
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) * things off the transmitted queue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) int sctp_outq_sack(struct sctp_outq *q, struct sctp_chunk *chunk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) struct sctp_association *asoc = q->asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) struct sctp_sackhdr *sack = chunk->subh.sack_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) struct sctp_transport *transport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) struct sctp_chunk *tchunk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) struct list_head *lchunk, *transport_list, *temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) union sctp_sack_variable *frags = sack->variable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) __u32 sack_ctsn, ctsn, tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) __u32 highest_tsn, highest_new_tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) __u32 sack_a_rwnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) unsigned int outstanding;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) struct sctp_transport *primary = asoc->peer.primary_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) int count_of_newacks = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) int gap_ack_blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) u8 accum_moved = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) /* Grab the association's destination address list. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) transport_list = &asoc->peer.transport_addr_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) /* SCTP path tracepoint for congestion control debugging. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) if (trace_sctp_probe_path_enabled()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) list_for_each_entry(transport, transport_list, transports)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) trace_sctp_probe_path(transport, asoc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) sack_ctsn = ntohl(sack->cum_tsn_ack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) gap_ack_blocks = ntohs(sack->num_gap_ack_blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) asoc->stats.gapcnt += gap_ack_blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) * SFR-CACC algorithm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) * On receipt of a SACK the sender SHOULD execute the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) * following statements.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) * 1) If the cumulative ack in the SACK passes next tsn_at_change
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) * on the current primary, the CHANGEOVER_ACTIVE flag SHOULD be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) * cleared. The CYCLING_CHANGEOVER flag SHOULD also be cleared for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) * all destinations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) * 2) If the SACK contains gap acks and the flag CHANGEOVER_ACTIVE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) * is set the receiver of the SACK MUST take the following actions:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) * A) Initialize the cacc_saw_newack to 0 for all destination
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) * addresses.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) * Only bother if changeover_active is set. Otherwise, this is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) * totally suboptimal to do on every SACK.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) if (primary->cacc.changeover_active) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) u8 clear_cycling = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) if (TSN_lte(primary->cacc.next_tsn_at_change, sack_ctsn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) primary->cacc.changeover_active = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) clear_cycling = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) if (clear_cycling || gap_ack_blocks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) list_for_each_entry(transport, transport_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) transports) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) if (clear_cycling)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) transport->cacc.cycling_changeover = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) if (gap_ack_blocks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) transport->cacc.cacc_saw_newack = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) /* Get the highest TSN in the sack. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) highest_tsn = sack_ctsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) if (gap_ack_blocks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) highest_tsn += ntohs(frags[gap_ack_blocks - 1].gab.end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) if (TSN_lt(asoc->highest_sacked, highest_tsn))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) asoc->highest_sacked = highest_tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) highest_new_tsn = sack_ctsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) /* Run through the retransmit queue. Credit bytes received
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) * and free those chunks that we can.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) sctp_check_transmitted(q, &q->retransmit, NULL, NULL, sack, &highest_new_tsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) /* Run through the transmitted queue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) * Credit bytes received and free those chunks which we can.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) * This is a MASSIVE candidate for optimization.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) list_for_each_entry(transport, transport_list, transports) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) sctp_check_transmitted(q, &transport->transmitted,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) transport, &chunk->source, sack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) &highest_new_tsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) * SFR-CACC algorithm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) * C) Let count_of_newacks be the number of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) * destinations for which cacc_saw_newack is set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) if (transport->cacc.cacc_saw_newack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) count_of_newacks++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) /* Move the Cumulative TSN Ack Point if appropriate. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) if (TSN_lt(asoc->ctsn_ack_point, sack_ctsn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) asoc->ctsn_ack_point = sack_ctsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) accum_moved = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) if (gap_ack_blocks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) if (asoc->fast_recovery && accum_moved)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) highest_new_tsn = highest_tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) list_for_each_entry(transport, transport_list, transports)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) sctp_mark_missing(q, &transport->transmitted, transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) highest_new_tsn, count_of_newacks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) /* Update unack_data field in the assoc. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) sctp_sack_update_unack_data(asoc, sack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) ctsn = asoc->ctsn_ack_point;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) /* Throw away stuff rotting on the sack queue. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) list_for_each_safe(lchunk, temp, &q->sacked) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344) tchunk = list_entry(lchunk, struct sctp_chunk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) transmitted_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) tsn = ntohl(tchunk->subh.data_hdr->tsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) if (TSN_lte(tsn, ctsn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) list_del_init(&tchunk->transmitted_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) if (asoc->peer.prsctp_capable &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) SCTP_PR_PRIO_ENABLED(chunk->sinfo.sinfo_flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) asoc->sent_cnt_removable--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) sctp_chunk_free(tchunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) /* ii) Set rwnd equal to the newly received a_rwnd minus the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) * number of bytes still outstanding after processing the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) * Cumulative TSN Ack and the Gap Ack Blocks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) sack_a_rwnd = ntohl(sack->a_rwnd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) asoc->peer.zero_window_announced = !sack_a_rwnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) outstanding = q->outstanding_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) if (outstanding < sack_a_rwnd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) sack_a_rwnd -= outstanding;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) sack_a_rwnd = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) asoc->peer.rwnd = sack_a_rwnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) asoc->stream.si->generate_ftsn(q, sack_ctsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) pr_debug("%s: sack cumulative tsn ack:0x%x\n", __func__, sack_ctsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) pr_debug("%s: cumulative tsn ack of assoc:%p is 0x%x, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) "advertised peer ack point:0x%x\n", __func__, asoc, ctsn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) asoc->adv_peer_ack_point);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) return sctp_outq_is_empty(q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) /* Is the outqueue empty?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) * The queue is empty when we have not pending data, no in-flight data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384) * and nothing pending retransmissions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) int sctp_outq_is_empty(const struct sctp_outq *q)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) return q->out_qlen == 0 && q->outstanding_bytes == 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) list_empty(&q->retransmit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) /********************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) * 2nd Level Abstractions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) ********************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) /* Go through a transport's transmitted list or the association's retransmit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) * list and move chunks that are acked by the Cumulative TSN Ack to q->sacked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) * The retransmit list will not have an associated transport.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) * I added coherent debug information output. --xguo
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) * Instead of printing 'sacked' or 'kept' for each TSN on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) * transmitted_queue, we print a range: SACKED: TSN1-TSN2, TSN3, TSN4-TSN5.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) * KEPT TSN6-TSN7, etc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) static void sctp_check_transmitted(struct sctp_outq *q,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) struct list_head *transmitted_queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) struct sctp_transport *transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) union sctp_addr *saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) struct sctp_sackhdr *sack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) __u32 *highest_new_tsn_in_sack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) struct list_head *lchunk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) struct sctp_chunk *tchunk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415) struct list_head tlist;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) __u32 tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) __u32 sack_ctsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) __u32 rtt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) __u8 restart_timer = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) int bytes_acked = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) int migrate_bytes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) bool forward_progress = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) sack_ctsn = ntohl(sack->cum_tsn_ack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) INIT_LIST_HEAD(&tlist);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) /* The while loop will skip empty transmitted queues. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) while (NULL != (lchunk = sctp_list_dequeue(transmitted_queue))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) tchunk = list_entry(lchunk, struct sctp_chunk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) transmitted_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) if (sctp_chunk_abandoned(tchunk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) /* Move the chunk to abandoned list. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) sctp_insert_list(&q->abandoned, lchunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) /* If this chunk has not been acked, stop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) * considering it as 'outstanding'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) if (transmitted_queue != &q->retransmit &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) !tchunk->tsn_gap_acked) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) if (tchunk->transport)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) tchunk->transport->flight_size -=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) sctp_data_size(tchunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) q->outstanding_bytes -= sctp_data_size(tchunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450) tsn = ntohl(tchunk->subh.data_hdr->tsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) if (sctp_acked(sack, tsn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) /* If this queue is the retransmit queue, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) * retransmit timer has already reclaimed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) * the outstanding bytes for this chunk, so only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) * count bytes associated with a transport.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) if (transport && !tchunk->tsn_gap_acked) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) /* If this chunk is being used for RTT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459) * measurement, calculate the RTT and update
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) * the RTO using this value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) * 6.3.1 C5) Karn's algorithm: RTT measurements
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463) * MUST NOT be made using packets that were
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) * retransmitted (and thus for which it is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) * ambiguous whether the reply was for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466) * first instance of the packet or a later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) * instance).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469) if (!sctp_chunk_retransmitted(tchunk) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) tchunk->rtt_in_progress) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) tchunk->rtt_in_progress = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) rtt = jiffies - tchunk->sent_at;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) sctp_transport_update_rto(transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) rtt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477) if (TSN_lte(tsn, sack_ctsn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479) * SFR-CACC algorithm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480) * 2) If the SACK contains gap acks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) * and the flag CHANGEOVER_ACTIVE is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) * set the receiver of the SACK MUST
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483) * take the following action:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) * B) For each TSN t being acked that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) * has not been acked in any SACK so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487) * far, set cacc_saw_newack to 1 for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) * the destination that the TSN was
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) * sent to.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491) if (sack->num_gap_ack_blocks &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492) q->asoc->peer.primary_path->cacc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) changeover_active)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) transport->cacc.cacc_saw_newack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499) /* If the chunk hasn't been marked as ACKED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) * mark it and account bytes_acked if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) * chunk had a valid transport (it will not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502) * have a transport if ASCONF had deleted it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) * while DATA was outstanding).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505) if (!tchunk->tsn_gap_acked) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506) tchunk->tsn_gap_acked = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507) if (TSN_lt(*highest_new_tsn_in_sack, tsn))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) *highest_new_tsn_in_sack = tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509) bytes_acked += sctp_data_size(tchunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) if (!tchunk->transport)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) migrate_bytes += sctp_data_size(tchunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) forward_progress = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) if (TSN_lte(tsn, sack_ctsn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516) /* RFC 2960 6.3.2 Retransmission Timer Rules
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518) * R3) Whenever a SACK is received
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) * that acknowledges the DATA chunk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520) * with the earliest outstanding TSN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521) * for that address, restart T3-rtx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522) * timer for that address with its
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) * current RTO.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) restart_timer = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526) forward_progress = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528) list_add_tail(&tchunk->transmitted_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) &q->sacked);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531) /* RFC2960 7.2.4, sctpimpguide-05 2.8.2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532) * M2) Each time a SACK arrives reporting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) * 'Stray DATA chunk(s)' record the highest TSN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534) * reported as newly acknowledged, call this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535) * value 'HighestTSNinSack'. A newly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) * acknowledged DATA chunk is one not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537) * previously acknowledged in a SACK.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539) * When the SCTP sender of data receives a SACK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) * chunk that acknowledges, for the first time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) * the receipt of a DATA chunk, all the still
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542) * unacknowledged DATA chunks whose TSN is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543) * older than that newly acknowledged DATA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) * chunk, are qualified as 'Stray DATA chunks'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546) list_add_tail(lchunk, &tlist);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549) if (tchunk->tsn_gap_acked) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550) pr_debug("%s: receiver reneged on data TSN:0x%x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) __func__, tsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553) tchunk->tsn_gap_acked = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) if (tchunk->transport)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556) bytes_acked -= sctp_data_size(tchunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558) /* RFC 2960 6.3.2 Retransmission Timer Rules
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560) * R4) Whenever a SACK is received missing a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561) * TSN that was previously acknowledged via a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) * Gap Ack Block, start T3-rtx for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563) * destination address to which the DATA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1564) * chunk was originally
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1565) * transmitted if it is not already running.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1566) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1567) restart_timer = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1568) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1570) list_add_tail(lchunk, &tlist);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1571) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1572) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1574) if (transport) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1575) if (bytes_acked) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1576) struct sctp_association *asoc = transport->asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1578) /* We may have counted DATA that was migrated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1579) * to this transport due to DEL-IP operation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1580) * Subtract those bytes, since the were never
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1581) * send on this transport and shouldn't be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1582) * credited to this transport.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1583) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1584) bytes_acked -= migrate_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1586) /* 8.2. When an outstanding TSN is acknowledged,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1587) * the endpoint shall clear the error counter of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1588) * the destination transport address to which the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1589) * DATA chunk was last sent.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1590) * The association's overall error counter is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1591) * also cleared.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1592) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1593) transport->error_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1594) transport->asoc->overall_error_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1595) forward_progress = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1597) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1598) * While in SHUTDOWN PENDING, we may have started
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1599) * the T5 shutdown guard timer after reaching the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1600) * retransmission limit. Stop that timer as soon
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1601) * as the receiver acknowledged any data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1602) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1603) if (asoc->state == SCTP_STATE_SHUTDOWN_PENDING &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1604) del_timer(&asoc->timers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1605) [SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1606) sctp_association_put(asoc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1607)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1608) /* Mark the destination transport address as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1609) * active if it is not so marked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1610) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1611) if ((transport->state == SCTP_INACTIVE ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1612) transport->state == SCTP_UNCONFIRMED) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1613) sctp_cmp_addr_exact(&transport->ipaddr, saddr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1614) sctp_assoc_control_transport(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1615) transport->asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1616) transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1617) SCTP_TRANSPORT_UP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1618) SCTP_RECEIVED_SACK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1619) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1620)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1621) sctp_transport_raise_cwnd(transport, sack_ctsn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1622) bytes_acked);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1623)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1624) transport->flight_size -= bytes_acked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1625) if (transport->flight_size == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1626) transport->partial_bytes_acked = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1627) q->outstanding_bytes -= bytes_acked + migrate_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1628) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1629) /* RFC 2960 6.1, sctpimpguide-06 2.15.2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1630) * When a sender is doing zero window probing, it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1631) * should not timeout the association if it continues
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1632) * to receive new packets from the receiver. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1633) * reason is that the receiver MAY keep its window
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1634) * closed for an indefinite time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1635) * A sender is doing zero window probing when the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1636) * receiver's advertised window is zero, and there is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1637) * only one data chunk in flight to the receiver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1638) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1639) * Allow the association to timeout while in SHUTDOWN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1640) * PENDING or SHUTDOWN RECEIVED in case the receiver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1641) * stays in zero window mode forever.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1642) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1643) if (!q->asoc->peer.rwnd &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1644) !list_empty(&tlist) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1645) (sack_ctsn+2 == q->asoc->next_tsn) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1646) q->asoc->state < SCTP_STATE_SHUTDOWN_PENDING) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1647) pr_debug("%s: sack received for zero window "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1648) "probe:%u\n", __func__, sack_ctsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1650) q->asoc->overall_error_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1651) transport->error_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1652) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1653) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1654)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1655) /* RFC 2960 6.3.2 Retransmission Timer Rules
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1656) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1657) * R2) Whenever all outstanding data sent to an address have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1658) * been acknowledged, turn off the T3-rtx timer of that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1659) * address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1660) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1661) if (!transport->flight_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1662) if (del_timer(&transport->T3_rtx_timer))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1663) sctp_transport_put(transport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1664) } else if (restart_timer) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1665) if (!mod_timer(&transport->T3_rtx_timer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1666) jiffies + transport->rto))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1667) sctp_transport_hold(transport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1668) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1669)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1670) if (forward_progress) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1671) if (transport->dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1672) sctp_transport_dst_confirm(transport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1673) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1674) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1675)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1676) list_splice(&tlist, transmitted_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1677) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1678)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1679) /* Mark chunks as missing and consequently may get retransmitted. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1680) static void sctp_mark_missing(struct sctp_outq *q,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1681) struct list_head *transmitted_queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1682) struct sctp_transport *transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1683) __u32 highest_new_tsn_in_sack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1684) int count_of_newacks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1685) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1686) struct sctp_chunk *chunk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1687) __u32 tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1688) char do_fast_retransmit = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1689) struct sctp_association *asoc = q->asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1690) struct sctp_transport *primary = asoc->peer.primary_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1691)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1692) list_for_each_entry(chunk, transmitted_queue, transmitted_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1693)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1694) tsn = ntohl(chunk->subh.data_hdr->tsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1696) /* RFC 2960 7.2.4, sctpimpguide-05 2.8.2 M3) Examine all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1697) * 'Unacknowledged TSN's', if the TSN number of an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1698) * 'Unacknowledged TSN' is smaller than the 'HighestTSNinSack'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1699) * value, increment the 'TSN.Missing.Report' count on that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1700) * chunk if it has NOT been fast retransmitted or marked for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1701) * fast retransmit already.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1702) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1703) if (chunk->fast_retransmit == SCTP_CAN_FRTX &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1704) !chunk->tsn_gap_acked &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1705) TSN_lt(tsn, highest_new_tsn_in_sack)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1706)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1707) /* SFR-CACC may require us to skip marking
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1708) * this chunk as missing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1709) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1710) if (!transport || !sctp_cacc_skip(primary,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1711) chunk->transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1712) count_of_newacks, tsn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1713) chunk->tsn_missing_report++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1714)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1715) pr_debug("%s: tsn:0x%x missing counter:%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1716) __func__, tsn, chunk->tsn_missing_report);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1717) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1718) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1719) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1720) * M4) If any DATA chunk is found to have a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1721) * 'TSN.Missing.Report'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1722) * value larger than or equal to 3, mark that chunk for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1723) * retransmission and start the fast retransmit procedure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1724) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1725)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1726) if (chunk->tsn_missing_report >= 3) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1727) chunk->fast_retransmit = SCTP_NEED_FRTX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1728) do_fast_retransmit = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1729) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1730) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1731)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1732) if (transport) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1733) if (do_fast_retransmit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1734) sctp_retransmit(q, transport, SCTP_RTXR_FAST_RTX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1735)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1736) pr_debug("%s: transport:%p, cwnd:%d, ssthresh:%d, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1737) "flight_size:%d, pba:%d\n", __func__, transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1738) transport->cwnd, transport->ssthresh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1739) transport->flight_size, transport->partial_bytes_acked);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1740) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1741) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1742)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1743) /* Is the given TSN acked by this packet? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1744) static int sctp_acked(struct sctp_sackhdr *sack, __u32 tsn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1745) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1746) __u32 ctsn = ntohl(sack->cum_tsn_ack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1747) union sctp_sack_variable *frags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1748) __u16 tsn_offset, blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1749) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1751) if (TSN_lte(tsn, ctsn))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1752) goto pass;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1753)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1754) /* 3.3.4 Selective Acknowledgment (SACK) (3):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1755) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1756) * Gap Ack Blocks:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1757) * These fields contain the Gap Ack Blocks. They are repeated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1758) * for each Gap Ack Block up to the number of Gap Ack Blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1759) * defined in the Number of Gap Ack Blocks field. All DATA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1760) * chunks with TSNs greater than or equal to (Cumulative TSN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1761) * Ack + Gap Ack Block Start) and less than or equal to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1762) * (Cumulative TSN Ack + Gap Ack Block End) of each Gap Ack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1763) * Block are assumed to have been received correctly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1764) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1766) frags = sack->variable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1767) blocks = ntohs(sack->num_gap_ack_blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1768) tsn_offset = tsn - ctsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1769) for (i = 0; i < blocks; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1770) if (tsn_offset >= ntohs(frags[i].gab.start) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1771) tsn_offset <= ntohs(frags[i].gab.end))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1772) goto pass;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1773) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1774)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1775) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1776) pass:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1777) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1778) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1779)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1780) static inline int sctp_get_skip_pos(struct sctp_fwdtsn_skip *skiplist,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1781) int nskips, __be16 stream)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1782) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1783) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1784)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1785) for (i = 0; i < nskips; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1786) if (skiplist[i].stream == stream)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1787) return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1788) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1789) return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1790) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1791)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1792) /* Create and add a fwdtsn chunk to the outq's control queue if needed. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1793) void sctp_generate_fwdtsn(struct sctp_outq *q, __u32 ctsn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1794) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1795) struct sctp_association *asoc = q->asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1796) struct sctp_chunk *ftsn_chunk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1797) struct sctp_fwdtsn_skip ftsn_skip_arr[10];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1798) int nskips = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1799) int skip_pos = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1800) __u32 tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1801) struct sctp_chunk *chunk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1802) struct list_head *lchunk, *temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1803)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1804) if (!asoc->peer.prsctp_capable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1805) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1806)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1807) /* PR-SCTP C1) Let SackCumAck be the Cumulative TSN ACK carried in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1808) * received SACK.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1809) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1810) * If (Advanced.Peer.Ack.Point < SackCumAck), then update
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1811) * Advanced.Peer.Ack.Point to be equal to SackCumAck.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1812) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1813) if (TSN_lt(asoc->adv_peer_ack_point, ctsn))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1814) asoc->adv_peer_ack_point = ctsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1815)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1816) /* PR-SCTP C2) Try to further advance the "Advanced.Peer.Ack.Point"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1817) * locally, that is, to move "Advanced.Peer.Ack.Point" up as long as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1818) * the chunk next in the out-queue space is marked as "abandoned" as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1819) * shown in the following example:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1820) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1821) * Assuming that a SACK arrived with the Cumulative TSN ACK 102
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1822) * and the Advanced.Peer.Ack.Point is updated to this value:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1823) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1824) * out-queue at the end of ==> out-queue after Adv.Ack.Point
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1825) * normal SACK processing local advancement
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1826) * ... ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1827) * Adv.Ack.Pt-> 102 acked 102 acked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1828) * 103 abandoned 103 abandoned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1829) * 104 abandoned Adv.Ack.P-> 104 abandoned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1830) * 105 105
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1831) * 106 acked 106 acked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1832) * ... ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1833) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1834) * In this example, the data sender successfully advanced the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1835) * "Advanced.Peer.Ack.Point" from 102 to 104 locally.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1836) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1837) list_for_each_safe(lchunk, temp, &q->abandoned) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1838) chunk = list_entry(lchunk, struct sctp_chunk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1839) transmitted_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1840) tsn = ntohl(chunk->subh.data_hdr->tsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1841)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1842) /* Remove any chunks in the abandoned queue that are acked by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1843) * the ctsn.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1844) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1845) if (TSN_lte(tsn, ctsn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1846) list_del_init(lchunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1847) sctp_chunk_free(chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1848) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1849) if (TSN_lte(tsn, asoc->adv_peer_ack_point+1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1850) asoc->adv_peer_ack_point = tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1851) if (chunk->chunk_hdr->flags &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1852) SCTP_DATA_UNORDERED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1853) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1854) skip_pos = sctp_get_skip_pos(&ftsn_skip_arr[0],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1855) nskips,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1856) chunk->subh.data_hdr->stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1857) ftsn_skip_arr[skip_pos].stream =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1858) chunk->subh.data_hdr->stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1859) ftsn_skip_arr[skip_pos].ssn =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1860) chunk->subh.data_hdr->ssn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1861) if (skip_pos == nskips)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1862) nskips++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1863) if (nskips == 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1864) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1865) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1866) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1867) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1868) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1870) /* PR-SCTP C3) If, after step C1 and C2, the "Advanced.Peer.Ack.Point"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1871) * is greater than the Cumulative TSN ACK carried in the received
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1872) * SACK, the data sender MUST send the data receiver a FORWARD TSN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1873) * chunk containing the latest value of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1874) * "Advanced.Peer.Ack.Point".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1875) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1876) * C4) For each "abandoned" TSN the sender of the FORWARD TSN SHOULD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1877) * list each stream and sequence number in the forwarded TSN. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1878) * information will enable the receiver to easily find any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1879) * stranded TSN's waiting on stream reorder queues. Each stream
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1880) * SHOULD only be reported once; this means that if multiple
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1881) * abandoned messages occur in the same stream then only the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1882) * highest abandoned stream sequence number is reported. If the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1883) * total size of the FORWARD TSN does NOT fit in a single MTU then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1884) * the sender of the FORWARD TSN SHOULD lower the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1885) * Advanced.Peer.Ack.Point to the last TSN that will fit in a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1886) * single MTU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1887) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1888) if (asoc->adv_peer_ack_point > ctsn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1889) ftsn_chunk = sctp_make_fwdtsn(asoc, asoc->adv_peer_ack_point,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1890) nskips, &ftsn_skip_arr[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1891)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1892) if (ftsn_chunk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1893) list_add_tail(&ftsn_chunk->list, &q->control_chunk_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1894) SCTP_INC_STATS(asoc->base.net, SCTP_MIB_OUTCTRLCHUNKS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1895) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1896) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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