^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 Intel Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (c) 2001 Nokia, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (c) 2001 La Monte H.P. Yarroll
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * This abstraction carries sctp events to the ULP (sockets).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Please send any bug reports or fixes you make to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * email address(es):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * lksctp developers <linux-sctp@vger.kernel.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Written or modified by:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Jon Grimm <jgrimm@us.ibm.com>
^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) * Sridhar Samudrala <sri@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <net/busy_poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <net/sctp/structs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <net/sctp/sctp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <net/sctp/sm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /* Forward declarations for internal helpers. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static struct sctp_ulpevent *sctp_ulpq_reasm(struct sctp_ulpq *ulpq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct sctp_ulpevent *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static struct sctp_ulpevent *sctp_ulpq_order(struct sctp_ulpq *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct sctp_ulpevent *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static void sctp_ulpq_reasm_drain(struct sctp_ulpq *ulpq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) /* 1st Level Abstractions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) /* Initialize a ULP queue from a block of memory. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct sctp_ulpq *sctp_ulpq_init(struct sctp_ulpq *ulpq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct sctp_association *asoc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) memset(ulpq, 0, sizeof(struct sctp_ulpq));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) ulpq->asoc = asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) skb_queue_head_init(&ulpq->reasm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) skb_queue_head_init(&ulpq->reasm_uo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) skb_queue_head_init(&ulpq->lobby);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) ulpq->pd_mode = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return ulpq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /* Flush the reassembly and ordering queues. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) void sctp_ulpq_flush(struct sctp_ulpq *ulpq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct sctp_ulpevent *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) while ((skb = __skb_dequeue(&ulpq->lobby)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) event = sctp_skb2event(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) sctp_ulpevent_free(event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) while ((skb = __skb_dequeue(&ulpq->reasm)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) event = sctp_skb2event(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) sctp_ulpevent_free(event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) while ((skb = __skb_dequeue(&ulpq->reasm_uo)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) event = sctp_skb2event(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) sctp_ulpevent_free(event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) /* Dispose of a ulpqueue. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) void sctp_ulpq_free(struct sctp_ulpq *ulpq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) sctp_ulpq_flush(ulpq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) /* Process an incoming DATA chunk. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) int sctp_ulpq_tail_data(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) struct sk_buff_head temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) struct sctp_ulpevent *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) int event_eor = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /* Create an event from the incoming chunk. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) event = sctp_ulpevent_make_rcvmsg(chunk->asoc, chunk, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (!event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) event->ssn = ntohs(chunk->subh.data_hdr->ssn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) event->ppid = chunk->subh.data_hdr->ppid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /* Do reassembly if needed. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) event = sctp_ulpq_reasm(ulpq, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) /* Do ordering if needed. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (event) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /* Create a temporary list to collect chunks on. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) skb_queue_head_init(&temp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) __skb_queue_tail(&temp, sctp_event2skb(event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (event->msg_flags & MSG_EOR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) event = sctp_ulpq_order(ulpq, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /* Send event to the ULP. 'event' is the sctp_ulpevent for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * very first SKB on the 'temp' list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (event) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) event_eor = (event->msg_flags & MSG_EOR) ? 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) sctp_ulpq_tail_event(ulpq, &temp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return event_eor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) /* Add a new event for propagation to the ULP. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /* Clear the partial delivery mode for this socket. Note: This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * assumes that no association is currently in partial delivery mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) int sctp_clear_pd(struct sock *sk, struct sctp_association *asoc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct sctp_sock *sp = sctp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (atomic_dec_and_test(&sp->pd_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) /* This means there are no other associations in PD, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * we can go ahead and clear out the lobby in one shot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (!skb_queue_empty(&sp->pd_lobby)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) skb_queue_splice_tail_init(&sp->pd_lobby,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) &sk->sk_receive_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) /* There are other associations in PD, so we only need to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) * pull stuff out of the lobby that belongs to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * associations that is exiting PD (all of its notifications
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) * are posted here).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (!skb_queue_empty(&sp->pd_lobby) && asoc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) struct sk_buff *skb, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) struct sctp_ulpevent *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) sctp_skb_for_each(skb, &sp->pd_lobby, tmp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) event = sctp_skb2event(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (event->asoc == asoc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) __skb_unlink(skb, &sp->pd_lobby);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) __skb_queue_tail(&sk->sk_receive_queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^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) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /* Set the pd_mode on the socket and ulpq */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static void sctp_ulpq_set_pd(struct sctp_ulpq *ulpq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) struct sctp_sock *sp = sctp_sk(ulpq->asoc->base.sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) atomic_inc(&sp->pd_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) ulpq->pd_mode = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /* Clear the pd_mode and restart any pending messages waiting for delivery. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static int sctp_ulpq_clear_pd(struct sctp_ulpq *ulpq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) ulpq->pd_mode = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) sctp_ulpq_reasm_drain(ulpq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return sctp_clear_pd(ulpq->asoc->base.sk, ulpq->asoc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) int sctp_ulpq_tail_event(struct sctp_ulpq *ulpq, struct sk_buff_head *skb_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) struct sock *sk = ulpq->asoc->base.sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) struct sctp_sock *sp = sctp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) struct sctp_ulpevent *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) struct sk_buff_head *queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) int clear_pd = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) skb = __skb_peek(skb_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) event = sctp_skb2event(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) /* If the socket is just going to throw this away, do not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) * even try to deliver it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) if (sk->sk_shutdown & RCV_SHUTDOWN &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) (sk->sk_shutdown & SEND_SHUTDOWN ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) !sctp_ulpevent_is_notification(event)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (!sctp_ulpevent_is_notification(event)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) sk_mark_napi_id(sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) sk_incoming_cpu_update(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) /* Check if the user wishes to receive this event. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (!sctp_ulpevent_is_enabled(event, ulpq->asoc->subscribe))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) /* If we are in partial delivery mode, post to the lobby until
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * partial delivery is cleared, unless, of course _this_ is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) * the association the cause of the partial delivery.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if (atomic_read(&sp->pd_mode) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) queue = &sk->sk_receive_queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) if (ulpq->pd_mode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) /* If the association is in partial delivery, we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) * need to finish delivering the partially processed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) * packet before passing any other data. This is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) * because we don't truly support stream interleaving.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if ((event->msg_flags & MSG_NOTIFICATION) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) (SCTP_DATA_NOT_FRAG ==
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) (event->msg_flags & SCTP_DATA_FRAG_MASK)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) queue = &sp->pd_lobby;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) clear_pd = event->msg_flags & MSG_EOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) queue = &sk->sk_receive_queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) * If fragment interleave is enabled, we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) * can queue this to the receive queue instead
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) * of the lobby.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (sp->frag_interleave)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) queue = &sk->sk_receive_queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) queue = &sp->pd_lobby;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) skb_queue_splice_tail_init(skb_list, queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) /* Did we just complete partial delivery and need to get
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * rolling again? Move pending data to the receive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * queue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) if (clear_pd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) sctp_ulpq_clear_pd(ulpq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) if (queue == &sk->sk_receive_queue && !sp->data_ready_signalled) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (!sock_owned_by_user(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) sp->data_ready_signalled = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) sk->sk_data_ready(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) if (skb_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) sctp_queue_purge_ulpevents(skb_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) sctp_ulpevent_free(event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /* 2nd Level Abstractions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) /* Helper function to store chunks that need to be reassembled. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) static void sctp_ulpq_store_reasm(struct sctp_ulpq *ulpq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) struct sctp_ulpevent *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) struct sk_buff *pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) struct sctp_ulpevent *cevent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) __u32 tsn, ctsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) tsn = event->tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) /* See if it belongs at the end. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) pos = skb_peek_tail(&ulpq->reasm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) if (!pos) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /* Short circuit just dropping it at the end. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) cevent = sctp_skb2event(pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) ctsn = cevent->tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) if (TSN_lt(ctsn, tsn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) __skb_queue_tail(&ulpq->reasm, sctp_event2skb(event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) /* Find the right place in this list. We store them by TSN. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) skb_queue_walk(&ulpq->reasm, pos) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) cevent = sctp_skb2event(pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) ctsn = cevent->tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) if (TSN_lt(tsn, ctsn))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) /* Insert before pos. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) __skb_queue_before(&ulpq->reasm, pos, sctp_event2skb(event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) /* Helper function to return an event corresponding to the reassembled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) * datagram.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) * This routine creates a re-assembled skb given the first and last skb's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) * as stored in the reassembly queue. The skb's may be non-linear if the sctp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) * payload was fragmented on the way and ip had to reassemble them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) * We add the rest of skb's to the first skb's fraglist.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) struct sctp_ulpevent *sctp_make_reassembled_event(struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) struct sk_buff_head *queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) struct sk_buff *f_frag,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) struct sk_buff *l_frag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) struct sk_buff *pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) struct sk_buff *new = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) struct sctp_ulpevent *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) struct sk_buff *pnext, *last;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) struct sk_buff *list = skb_shinfo(f_frag)->frag_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) /* Store the pointer to the 2nd skb */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) if (f_frag == l_frag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) pos = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) pos = f_frag->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) /* Get the last skb in the f_frag's frag_list if present. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) for (last = list; list; last = list, list = list->next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) /* Add the list of remaining fragments to the first fragments
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) * frag_list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) if (last)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) last->next = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (skb_cloned(f_frag)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) /* This is a cloned skb, we can't just modify
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) * the frag_list. We need a new skb to do that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) * Instead of calling skb_unshare(), we'll do it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) * ourselves since we need to delay the free.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) new = skb_copy(f_frag, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) if (!new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) return NULL; /* try again later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) sctp_skb_set_owner_r(new, f_frag->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) skb_shinfo(new)->frag_list = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) skb_shinfo(f_frag)->frag_list = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) /* Remove the first fragment from the reassembly queue. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) __skb_unlink(f_frag, queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) /* if we did unshare, then free the old skb and re-assign */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) if (new) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) kfree_skb(f_frag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) f_frag = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) while (pos) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) pnext = pos->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) /* Update the len and data_len fields of the first fragment. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) f_frag->len += pos->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) f_frag->data_len += pos->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) /* Remove the fragment from the reassembly queue. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) __skb_unlink(pos, queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) /* Break if we have reached the last fragment. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) if (pos == l_frag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) pos->next = pnext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) pos = pnext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) event = sctp_skb2event(f_frag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) SCTP_INC_STATS(net, SCTP_MIB_REASMUSRMSGS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) return event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) /* Helper function to check if an incoming chunk has filled up the last
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) * missing fragment in a SCTP datagram and return the corresponding event.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) static struct sctp_ulpevent *sctp_ulpq_retrieve_reassembled(struct sctp_ulpq *ulpq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) struct sk_buff *pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) struct sctp_ulpevent *cevent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) struct sk_buff *first_frag = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) __u32 ctsn, next_tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) struct sctp_ulpevent *retval = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) struct sk_buff *pd_first = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) struct sk_buff *pd_last = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) size_t pd_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) struct sctp_association *asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) u32 pd_point;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) /* Initialized to 0 just to avoid compiler warning message. Will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) * never be used with this value. It is referenced only after it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) * is set when we find the first fragment of a message.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) next_tsn = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) /* The chunks are held in the reasm queue sorted by TSN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * Walk through the queue sequentially and look for a sequence of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) * fragmented chunks that complete a datagram.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) * 'first_frag' and next_tsn are reset when we find a chunk which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) * is the first fragment of a datagram. Once these 2 fields are set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) * we expect to find the remaining middle fragments and the last
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) * fragment in order. If not, first_frag is reset to NULL and we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) * start the next pass when we find another first fragment.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) * There is a potential to do partial delivery if user sets
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) * SCTP_PARTIAL_DELIVERY_POINT option. Lets count some things here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) * to see if can do PD.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) skb_queue_walk(&ulpq->reasm, pos) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) cevent = sctp_skb2event(pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) ctsn = cevent->tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) case SCTP_DATA_FIRST_FRAG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) /* If this "FIRST_FRAG" is the first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) * element in the queue, then count it towards
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) * possible PD.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) if (skb_queue_is_first(&ulpq->reasm, pos)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) pd_first = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) pd_last = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) pd_len = pos->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) pd_first = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) pd_last = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) pd_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) first_frag = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) next_tsn = ctsn + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) case SCTP_DATA_MIDDLE_FRAG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) if ((first_frag) && (ctsn == next_tsn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) next_tsn++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) if (pd_first) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) pd_last = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) pd_len += pos->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) first_frag = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) case SCTP_DATA_LAST_FRAG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) if (first_frag && (ctsn == next_tsn))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) first_frag = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) asoc = ulpq->asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) if (pd_first) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) /* Make sure we can enter partial deliver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) * We can trigger partial delivery only if framgent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) * interleave is set, or the socket is not already
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) * in partial delivery.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) if (!sctp_sk(asoc->base.sk)->frag_interleave &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) atomic_read(&sctp_sk(asoc->base.sk)->pd_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) cevent = sctp_skb2event(pd_first);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) pd_point = sctp_sk(asoc->base.sk)->pd_point;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) if (pd_point && pd_point <= pd_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) retval = sctp_make_reassembled_event(asoc->base.net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) &ulpq->reasm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) pd_first, pd_last);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) sctp_ulpq_set_pd(ulpq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) found:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) retval = sctp_make_reassembled_event(ulpq->asoc->base.net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) &ulpq->reasm, first_frag, pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) retval->msg_flags |= MSG_EOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) /* Retrieve the next set of fragments of a partial message. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) static struct sctp_ulpevent *sctp_ulpq_retrieve_partial(struct sctp_ulpq *ulpq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) struct sk_buff *pos, *last_frag, *first_frag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) struct sctp_ulpevent *cevent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) __u32 ctsn, next_tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) int is_last;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) struct sctp_ulpevent *retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) /* The chunks are held in the reasm queue sorted by TSN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) * Walk through the queue sequentially and look for the first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) * sequence of fragmented chunks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) if (skb_queue_empty(&ulpq->reasm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) last_frag = first_frag = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) retval = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) next_tsn = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) is_last = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) skb_queue_walk(&ulpq->reasm, pos) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) cevent = sctp_skb2event(pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) ctsn = cevent->tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) case SCTP_DATA_FIRST_FRAG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) if (!first_frag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) case SCTP_DATA_MIDDLE_FRAG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) if (!first_frag) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) first_frag = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) next_tsn = ctsn + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) last_frag = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) } else if (next_tsn == ctsn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) next_tsn++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) last_frag = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) case SCTP_DATA_LAST_FRAG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) if (!first_frag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) first_frag = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) else if (ctsn != next_tsn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) last_frag = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) is_last = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) /* We have the reassembled event. There is no need to look
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) * further.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) retval = sctp_make_reassembled_event(ulpq->asoc->base.net, &ulpq->reasm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) first_frag, last_frag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) if (retval && is_last)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) retval->msg_flags |= MSG_EOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) /* Helper function to reassemble chunks. Hold chunks on the reasm queue that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) * need reassembling.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) static struct sctp_ulpevent *sctp_ulpq_reasm(struct sctp_ulpq *ulpq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) struct sctp_ulpevent *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) struct sctp_ulpevent *retval = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) /* Check if this is part of a fragmented message. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) if (SCTP_DATA_NOT_FRAG == (event->msg_flags & SCTP_DATA_FRAG_MASK)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) event->msg_flags |= MSG_EOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) return event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) sctp_ulpq_store_reasm(ulpq, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) if (!ulpq->pd_mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) retval = sctp_ulpq_retrieve_reassembled(ulpq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) __u32 ctsn, ctsnap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) /* Do not even bother unless this is the next tsn to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) * be delivered.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) ctsn = event->tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) ctsnap = sctp_tsnmap_get_ctsn(&ulpq->asoc->peer.tsn_map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) if (TSN_lte(ctsn, ctsnap))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) retval = sctp_ulpq_retrieve_partial(ulpq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) /* Retrieve the first part (sequential fragments) for partial delivery. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) static struct sctp_ulpevent *sctp_ulpq_retrieve_first(struct sctp_ulpq *ulpq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) struct sk_buff *pos, *last_frag, *first_frag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) struct sctp_ulpevent *cevent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) __u32 ctsn, next_tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) struct sctp_ulpevent *retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) /* The chunks are held in the reasm queue sorted by TSN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) * Walk through the queue sequentially and look for a sequence of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) * fragmented chunks that start a datagram.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) if (skb_queue_empty(&ulpq->reasm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) last_frag = first_frag = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) retval = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) next_tsn = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) skb_queue_walk(&ulpq->reasm, pos) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) cevent = sctp_skb2event(pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) ctsn = cevent->tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) case SCTP_DATA_FIRST_FRAG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) if (!first_frag) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) first_frag = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) next_tsn = ctsn + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) last_frag = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) case SCTP_DATA_MIDDLE_FRAG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) if (!first_frag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) if (ctsn == next_tsn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) next_tsn++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) last_frag = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) case SCTP_DATA_LAST_FRAG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) if (!first_frag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) /* We have the reassembled event. There is no need to look
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) * further.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) retval = sctp_make_reassembled_event(ulpq->asoc->base.net, &ulpq->reasm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) first_frag, last_frag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) * Flush out stale fragments from the reassembly queue when processing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) * a Forward TSN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) * RFC 3758, Section 3.6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) * After receiving and processing a FORWARD TSN, the data receiver MUST
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) * take cautions in updating its re-assembly queue. The receiver MUST
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) * remove any partially reassembled message, which is still missing one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) * or more TSNs earlier than or equal to the new cumulative TSN point.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) * In the event that the receiver has invoked the partial delivery API,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) * a notification SHOULD also be generated to inform the upper layer API
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) * that the message being partially delivered will NOT be completed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) void sctp_ulpq_reasm_flushtsn(struct sctp_ulpq *ulpq, __u32 fwd_tsn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) struct sk_buff *pos, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) struct sctp_ulpevent *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) __u32 tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) if (skb_queue_empty(&ulpq->reasm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) skb_queue_walk_safe(&ulpq->reasm, pos, tmp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) event = sctp_skb2event(pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) tsn = event->tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) /* Since the entire message must be abandoned by the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) * sender (item A3 in Section 3.5, RFC 3758), we can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) * free all fragments on the list that are less then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) * or equal to ctsn_point
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) if (TSN_lte(tsn, fwd_tsn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) __skb_unlink(pos, &ulpq->reasm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) sctp_ulpevent_free(event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) * Drain the reassembly queue. If we just cleared parted delivery, it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) * is possible that the reassembly queue will contain already reassembled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) * messages. Retrieve any such messages and give them to the user.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) static void sctp_ulpq_reasm_drain(struct sctp_ulpq *ulpq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) struct sctp_ulpevent *event = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) if (skb_queue_empty(&ulpq->reasm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) while ((event = sctp_ulpq_retrieve_reassembled(ulpq)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) struct sk_buff_head temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) skb_queue_head_init(&temp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) __skb_queue_tail(&temp, sctp_event2skb(event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) /* Do ordering if needed. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) if (event->msg_flags & MSG_EOR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) event = sctp_ulpq_order(ulpq, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) /* Send event to the ULP. 'event' is the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) * sctp_ulpevent for very first SKB on the temp' list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) if (event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) sctp_ulpq_tail_event(ulpq, &temp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) }
^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) /* Helper function to gather skbs that have possibly become
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) * ordered by an incoming chunk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) static void sctp_ulpq_retrieve_ordered(struct sctp_ulpq *ulpq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) struct sctp_ulpevent *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) struct sk_buff_head *event_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) struct sk_buff *pos, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) struct sctp_ulpevent *cevent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) struct sctp_stream *stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) __u16 sid, csid, cssn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) sid = event->stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) stream = &ulpq->asoc->stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) event_list = (struct sk_buff_head *) sctp_event2skb(event)->prev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) /* We are holding the chunks by stream, by SSN. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) sctp_skb_for_each(pos, &ulpq->lobby, tmp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) cevent = (struct sctp_ulpevent *) pos->cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) csid = cevent->stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) cssn = cevent->ssn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) /* Have we gone too far? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) if (csid > sid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) /* Have we not gone far enough? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) if (csid < sid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) if (cssn != sctp_ssn_peek(stream, in, sid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) /* Found it, so mark in the stream. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) sctp_ssn_next(stream, in, sid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) __skb_unlink(pos, &ulpq->lobby);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) /* Attach all gathered skbs to the event. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) __skb_queue_tail(event_list, pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) /* Helper function to store chunks needing ordering. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) static void sctp_ulpq_store_ordered(struct sctp_ulpq *ulpq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) struct sctp_ulpevent *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) struct sk_buff *pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) struct sctp_ulpevent *cevent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) __u16 sid, csid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) __u16 ssn, cssn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) pos = skb_peek_tail(&ulpq->lobby);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) if (!pos) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) sid = event->stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) ssn = event->ssn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) cevent = (struct sctp_ulpevent *) pos->cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) csid = cevent->stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) cssn = cevent->ssn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) if (sid > csid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) if ((sid == csid) && SSN_lt(cssn, ssn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) __skb_queue_tail(&ulpq->lobby, sctp_event2skb(event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) /* Find the right place in this list. We store them by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) * stream ID and then by SSN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) skb_queue_walk(&ulpq->lobby, pos) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) cevent = (struct sctp_ulpevent *) pos->cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) csid = cevent->stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) cssn = cevent->ssn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) if (csid > sid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) if (csid == sid && SSN_lt(ssn, cssn))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) /* Insert before pos. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) __skb_queue_before(&ulpq->lobby, pos, sctp_event2skb(event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) static struct sctp_ulpevent *sctp_ulpq_order(struct sctp_ulpq *ulpq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) struct sctp_ulpevent *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) __u16 sid, ssn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) struct sctp_stream *stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) /* Check if this message needs ordering. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) if (event->msg_flags & SCTP_DATA_UNORDERED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) return event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) /* Note: The stream ID must be verified before this routine. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) sid = event->stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) ssn = event->ssn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) stream = &ulpq->asoc->stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) /* Is this the expected SSN for this stream ID? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) if (ssn != sctp_ssn_peek(stream, in, sid)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) /* We've received something out of order, so find where it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) * needs to be placed. We order by stream and then by SSN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) sctp_ulpq_store_ordered(ulpq, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) /* Mark that the next chunk has been found. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) sctp_ssn_next(stream, in, sid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) /* Go find any other chunks that were waiting for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) * ordering.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) sctp_ulpq_retrieve_ordered(ulpq, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) return event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) /* Helper function to gather skbs that have possibly become
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) * ordered by forward tsn skipping their dependencies.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) static void sctp_ulpq_reap_ordered(struct sctp_ulpq *ulpq, __u16 sid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) struct sk_buff *pos, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) struct sctp_ulpevent *cevent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) struct sctp_ulpevent *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) struct sctp_stream *stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) struct sk_buff_head temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) struct sk_buff_head *lobby = &ulpq->lobby;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) __u16 csid, cssn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) stream = &ulpq->asoc->stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) /* We are holding the chunks by stream, by SSN. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) skb_queue_head_init(&temp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) event = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) sctp_skb_for_each(pos, lobby, tmp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) cevent = (struct sctp_ulpevent *) pos->cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) csid = cevent->stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) cssn = cevent->ssn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) /* Have we gone too far? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) if (csid > sid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) /* Have we not gone far enough? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) if (csid < sid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) /* see if this ssn has been marked by skipping */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) if (!SSN_lt(cssn, sctp_ssn_peek(stream, in, csid)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) __skb_unlink(pos, lobby);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) if (!event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) /* Create a temporary list to collect chunks on. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) event = sctp_skb2event(pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) /* Attach all gathered skbs to the event. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) __skb_queue_tail(&temp, pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) /* If we didn't reap any data, see if the next expected SSN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) * is next on the queue and if so, use that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) if (event == NULL && pos != (struct sk_buff *)lobby) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) cevent = (struct sctp_ulpevent *) pos->cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) csid = cevent->stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) cssn = cevent->ssn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) if (csid == sid && cssn == sctp_ssn_peek(stream, in, csid)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) sctp_ssn_next(stream, in, csid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) __skb_unlink(pos, lobby);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) __skb_queue_tail(&temp, pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) event = sctp_skb2event(pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) /* Send event to the ULP. 'event' is the sctp_ulpevent for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) * very first SKB on the 'temp' list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) if (event) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) /* see if we have more ordered that we can deliver */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) sctp_ulpq_retrieve_ordered(ulpq, event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) sctp_ulpq_tail_event(ulpq, &temp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) /* Skip over an SSN. This is used during the processing of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) * Forwared TSN chunk to skip over the abandoned ordered data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) void sctp_ulpq_skip(struct sctp_ulpq *ulpq, __u16 sid, __u16 ssn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) struct sctp_stream *stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) /* Note: The stream ID must be verified before this routine. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) stream = &ulpq->asoc->stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) /* Is this an old SSN? If so ignore. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) if (SSN_lt(ssn, sctp_ssn_peek(stream, in, sid)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) /* Mark that we are no longer expecting this SSN or lower. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) sctp_ssn_skip(stream, in, sid, ssn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) /* Go find any other chunks that were waiting for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) * ordering and deliver them if needed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) sctp_ulpq_reap_ordered(ulpq, sid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) __u16 sctp_ulpq_renege_list(struct sctp_ulpq *ulpq, struct sk_buff_head *list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) __u16 needed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) __u16 freed = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) __u32 tsn, last_tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) struct sk_buff *skb, *flist, *last;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) struct sctp_ulpevent *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) struct sctp_tsnmap *tsnmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) tsnmap = &ulpq->asoc->peer.tsn_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) while ((skb = skb_peek_tail(list)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) event = sctp_skb2event(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) tsn = event->tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) /* Don't renege below the Cumulative TSN ACK Point. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) if (TSN_lte(tsn, sctp_tsnmap_get_ctsn(tsnmap)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) /* Events in ordering queue may have multiple fragments
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) * corresponding to additional TSNs. Sum the total
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) * freed space; find the last TSN.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) freed += skb_headlen(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) flist = skb_shinfo(skb)->frag_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) for (last = flist; flist; flist = flist->next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) last = flist;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) freed += skb_headlen(last);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) if (last)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) last_tsn = sctp_skb2event(last)->tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) last_tsn = tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) /* Unlink the event, then renege all applicable TSNs. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) __skb_unlink(skb, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) sctp_ulpevent_free(event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) while (TSN_lte(tsn, last_tsn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) sctp_tsnmap_renege(tsnmap, tsn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) tsn++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) if (freed >= needed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) return freed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) return freed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) /* Renege 'needed' bytes from the ordering queue. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) static __u16 sctp_ulpq_renege_order(struct sctp_ulpq *ulpq, __u16 needed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) return sctp_ulpq_renege_list(ulpq, &ulpq->lobby, needed);
^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) /* Renege 'needed' bytes from the reassembly queue. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) static __u16 sctp_ulpq_renege_frags(struct sctp_ulpq *ulpq, __u16 needed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) return sctp_ulpq_renege_list(ulpq, &ulpq->reasm, needed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) /* Partial deliver the first message as there is pressure on rwnd. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) void sctp_ulpq_partial_delivery(struct sctp_ulpq *ulpq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) struct sctp_ulpevent *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) struct sctp_association *asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) struct sctp_sock *sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) __u32 ctsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) asoc = ulpq->asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) sp = sctp_sk(asoc->base.sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) /* If the association is already in Partial Delivery mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) * we have nothing to do.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) if (ulpq->pd_mode)
^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) /* Data must be at or below the Cumulative TSN ACK Point to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) * start partial delivery.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) skb = skb_peek(&asoc->ulpq.reasm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) if (skb != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) ctsn = sctp_skb2event(skb)->tsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) if (!TSN_lte(ctsn, sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) /* If the user enabled fragment interleave socket option,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) * multiple associations can enter partial delivery.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) * Otherwise, we can only enter partial delivery if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) * socket is not in partial deliver mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) if (sp->frag_interleave || atomic_read(&sp->pd_mode) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) /* Is partial delivery possible? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) event = sctp_ulpq_retrieve_first(ulpq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) /* Send event to the ULP. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) if (event) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) struct sk_buff_head temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) skb_queue_head_init(&temp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) __skb_queue_tail(&temp, sctp_event2skb(event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) sctp_ulpq_tail_event(ulpq, &temp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) sctp_ulpq_set_pd(ulpq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) /* Renege some packets to make room for an incoming chunk. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) void sctp_ulpq_renege(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) struct sctp_association *asoc = ulpq->asoc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) __u32 freed = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) __u16 needed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) needed = ntohs(chunk->chunk_hdr->length) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) sizeof(struct sctp_data_chunk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) if (skb_queue_empty(&asoc->base.sk->sk_receive_queue)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) freed = sctp_ulpq_renege_order(ulpq, needed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) if (freed < needed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) freed += sctp_ulpq_renege_frags(ulpq, needed - freed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) /* If able to free enough room, accept this chunk. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) if (sk_rmem_schedule(asoc->base.sk, chunk->skb, needed) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) freed >= needed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) int retval = sctp_ulpq_tail_data(ulpq, chunk, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) * Enter partial delivery if chunk has not been
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) * delivered; otherwise, drain the reassembly queue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) if (retval <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) sctp_ulpq_partial_delivery(ulpq, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) else if (retval == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) sctp_ulpq_reasm_drain(ulpq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) sk_mem_reclaim(asoc->base.sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) /* Notify the application if an association is aborted and in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) * partial delivery mode. Send up any pending received messages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) void sctp_ulpq_abort_pd(struct sctp_ulpq *ulpq, gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) struct sctp_ulpevent *ev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) struct sctp_sock *sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) struct sock *sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) if (!ulpq->pd_mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) sk = ulpq->asoc->base.sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) sp = sctp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) if (sctp_ulpevent_type_enabled(ulpq->asoc->subscribe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) SCTP_PARTIAL_DELIVERY_EVENT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) ev = sctp_ulpevent_make_pdapi(ulpq->asoc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) SCTP_PARTIAL_DELIVERY_ABORTED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) 0, 0, 0, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) if (ev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) __skb_queue_tail(&sk->sk_receive_queue, sctp_event2skb(ev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) /* If there is data waiting, send it up the socket now. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) if ((sctp_ulpq_clear_pd(ulpq) || ev) && !sp->data_ready_signalled) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) sp->data_ready_signalled = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) sk->sk_data_ready(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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