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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /* RxRPC packet transmission
0003  *
0004  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
0005  * Written by David Howells (dhowells@redhat.com)
0006  */
0007 
0008 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0009 
0010 #include <linux/net.h>
0011 #include <linux/gfp.h>
0012 #include <linux/skbuff.h>
0013 #include <linux/export.h>
0014 #include <net/sock.h>
0015 #include <net/af_rxrpc.h>
0016 #include "ar-internal.h"
0017 
0018 struct rxrpc_ack_buffer {
0019     struct rxrpc_wire_header whdr;
0020     struct rxrpc_ackpacket ack;
0021     u8 acks[255];
0022     u8 pad[3];
0023     struct rxrpc_ackinfo ackinfo;
0024 };
0025 
0026 struct rxrpc_abort_buffer {
0027     struct rxrpc_wire_header whdr;
0028     __be32 abort_code;
0029 };
0030 
0031 static const char rxrpc_keepalive_string[] = "";
0032 
0033 /*
0034  * Increase Tx backoff on transmission failure and clear it on success.
0035  */
0036 static void rxrpc_tx_backoff(struct rxrpc_call *call, int ret)
0037 {
0038     if (ret < 0) {
0039         u16 tx_backoff = READ_ONCE(call->tx_backoff);
0040 
0041         if (tx_backoff < HZ)
0042             WRITE_ONCE(call->tx_backoff, tx_backoff + 1);
0043     } else {
0044         WRITE_ONCE(call->tx_backoff, 0);
0045     }
0046 }
0047 
0048 /*
0049  * Arrange for a keepalive ping a certain time after we last transmitted.  This
0050  * lets the far side know we're still interested in this call and helps keep
0051  * the route through any intervening firewall open.
0052  *
0053  * Receiving a response to the ping will prevent the ->expect_rx_by timer from
0054  * expiring.
0055  */
0056 static void rxrpc_set_keepalive(struct rxrpc_call *call)
0057 {
0058     unsigned long now = jiffies, keepalive_at = call->next_rx_timo / 6;
0059 
0060     keepalive_at += now;
0061     WRITE_ONCE(call->keepalive_at, keepalive_at);
0062     rxrpc_reduce_call_timer(call, keepalive_at, now,
0063                 rxrpc_timer_set_for_keepalive);
0064 }
0065 
0066 /*
0067  * Fill out an ACK packet.
0068  */
0069 static size_t rxrpc_fill_out_ack(struct rxrpc_connection *conn,
0070                  struct rxrpc_call *call,
0071                  struct rxrpc_ack_buffer *pkt,
0072                  rxrpc_seq_t *_hard_ack,
0073                  rxrpc_seq_t *_top,
0074                  u8 reason)
0075 {
0076     rxrpc_serial_t serial;
0077     unsigned int tmp;
0078     rxrpc_seq_t hard_ack, top, seq;
0079     int ix;
0080     u32 mtu, jmax;
0081     u8 *ackp = pkt->acks;
0082 
0083     tmp = atomic_xchg(&call->ackr_nr_unacked, 0);
0084     tmp |= atomic_xchg(&call->ackr_nr_consumed, 0);
0085     if (!tmp && (reason == RXRPC_ACK_DELAY ||
0086              reason == RXRPC_ACK_IDLE))
0087         return 0;
0088 
0089     /* Barrier against rxrpc_input_data(). */
0090     serial = call->ackr_serial;
0091     hard_ack = READ_ONCE(call->rx_hard_ack);
0092     top = smp_load_acquire(&call->rx_top);
0093     *_hard_ack = hard_ack;
0094     *_top = top;
0095 
0096     pkt->ack.bufferSpace    = htons(8);
0097     pkt->ack.maxSkew    = htons(0);
0098     pkt->ack.firstPacket    = htonl(hard_ack + 1);
0099     pkt->ack.previousPacket = htonl(call->ackr_highest_seq);
0100     pkt->ack.serial     = htonl(serial);
0101     pkt->ack.reason     = reason;
0102     pkt->ack.nAcks      = top - hard_ack;
0103 
0104     if (reason == RXRPC_ACK_PING)
0105         pkt->whdr.flags |= RXRPC_REQUEST_ACK;
0106 
0107     if (after(top, hard_ack)) {
0108         seq = hard_ack + 1;
0109         do {
0110             ix = seq & RXRPC_RXTX_BUFF_MASK;
0111             if (call->rxtx_buffer[ix])
0112                 *ackp++ = RXRPC_ACK_TYPE_ACK;
0113             else
0114                 *ackp++ = RXRPC_ACK_TYPE_NACK;
0115             seq++;
0116         } while (before_eq(seq, top));
0117     }
0118 
0119     mtu = conn->params.peer->if_mtu;
0120     mtu -= conn->params.peer->hdrsize;
0121     jmax = (call->nr_jumbo_bad > 3) ? 1 : rxrpc_rx_jumbo_max;
0122     pkt->ackinfo.rxMTU  = htonl(rxrpc_rx_mtu);
0123     pkt->ackinfo.maxMTU = htonl(mtu);
0124     pkt->ackinfo.rwind  = htonl(call->rx_winsize);
0125     pkt->ackinfo.jumbo_max  = htonl(jmax);
0126 
0127     *ackp++ = 0;
0128     *ackp++ = 0;
0129     *ackp++ = 0;
0130     return top - hard_ack + 3;
0131 }
0132 
0133 /*
0134  * Record the beginning of an RTT probe.
0135  */
0136 static int rxrpc_begin_rtt_probe(struct rxrpc_call *call, rxrpc_serial_t serial,
0137                  enum rxrpc_rtt_tx_trace why)
0138 {
0139     unsigned long avail = call->rtt_avail;
0140     int rtt_slot = 9;
0141 
0142     if (!(avail & RXRPC_CALL_RTT_AVAIL_MASK))
0143         goto no_slot;
0144 
0145     rtt_slot = __ffs(avail & RXRPC_CALL_RTT_AVAIL_MASK);
0146     if (!test_and_clear_bit(rtt_slot, &call->rtt_avail))
0147         goto no_slot;
0148 
0149     call->rtt_serial[rtt_slot] = serial;
0150     call->rtt_sent_at[rtt_slot] = ktime_get_real();
0151     smp_wmb(); /* Write data before avail bit */
0152     set_bit(rtt_slot + RXRPC_CALL_RTT_PEND_SHIFT, &call->rtt_avail);
0153 
0154     trace_rxrpc_rtt_tx(call, why, rtt_slot, serial);
0155     return rtt_slot;
0156 
0157 no_slot:
0158     trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_no_slot, rtt_slot, serial);
0159     return -1;
0160 }
0161 
0162 /*
0163  * Cancel an RTT probe.
0164  */
0165 static void rxrpc_cancel_rtt_probe(struct rxrpc_call *call,
0166                    rxrpc_serial_t serial, int rtt_slot)
0167 {
0168     if (rtt_slot != -1) {
0169         clear_bit(rtt_slot + RXRPC_CALL_RTT_PEND_SHIFT, &call->rtt_avail);
0170         smp_wmb(); /* Clear pending bit before setting slot */
0171         set_bit(rtt_slot, &call->rtt_avail);
0172         trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_cancel, rtt_slot, serial);
0173     }
0174 }
0175 
0176 /*
0177  * Send an ACK call packet.
0178  */
0179 int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping,
0180               rxrpc_serial_t *_serial)
0181 {
0182     struct rxrpc_connection *conn;
0183     struct rxrpc_ack_buffer *pkt;
0184     struct msghdr msg;
0185     struct kvec iov[2];
0186     rxrpc_serial_t serial;
0187     rxrpc_seq_t hard_ack, top;
0188     size_t len, n;
0189     int ret, rtt_slot = -1;
0190     u8 reason;
0191 
0192     if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
0193         return -ECONNRESET;
0194 
0195     pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
0196     if (!pkt)
0197         return -ENOMEM;
0198 
0199     conn = call->conn;
0200 
0201     msg.msg_name    = &call->peer->srx.transport;
0202     msg.msg_namelen = call->peer->srx.transport_len;
0203     msg.msg_control = NULL;
0204     msg.msg_controllen = 0;
0205     msg.msg_flags   = 0;
0206 
0207     pkt->whdr.epoch     = htonl(conn->proto.epoch);
0208     pkt->whdr.cid       = htonl(call->cid);
0209     pkt->whdr.callNumber    = htonl(call->call_id);
0210     pkt->whdr.seq       = 0;
0211     pkt->whdr.type      = RXRPC_PACKET_TYPE_ACK;
0212     pkt->whdr.flags     = RXRPC_SLOW_START_OK | conn->out_clientflag;
0213     pkt->whdr.userStatus    = 0;
0214     pkt->whdr.securityIndex = call->security_ix;
0215     pkt->whdr._rsvd     = 0;
0216     pkt->whdr.serviceId = htons(call->service_id);
0217 
0218     spin_lock_bh(&call->lock);
0219     if (ping) {
0220         reason = RXRPC_ACK_PING;
0221     } else {
0222         reason = call->ackr_reason;
0223         if (!call->ackr_reason) {
0224             spin_unlock_bh(&call->lock);
0225             ret = 0;
0226             goto out;
0227         }
0228         call->ackr_reason = 0;
0229     }
0230     n = rxrpc_fill_out_ack(conn, call, pkt, &hard_ack, &top, reason);
0231 
0232     spin_unlock_bh(&call->lock);
0233     if (n == 0) {
0234         kfree(pkt);
0235         return 0;
0236     }
0237 
0238     iov[0].iov_base = pkt;
0239     iov[0].iov_len  = sizeof(pkt->whdr) + sizeof(pkt->ack) + n;
0240     iov[1].iov_base = &pkt->ackinfo;
0241     iov[1].iov_len  = sizeof(pkt->ackinfo);
0242     len = iov[0].iov_len + iov[1].iov_len;
0243 
0244     serial = atomic_inc_return(&conn->serial);
0245     pkt->whdr.serial = htonl(serial);
0246     trace_rxrpc_tx_ack(call->debug_id, serial,
0247                ntohl(pkt->ack.firstPacket),
0248                ntohl(pkt->ack.serial),
0249                pkt->ack.reason, pkt->ack.nAcks);
0250     if (_serial)
0251         *_serial = serial;
0252 
0253     if (ping)
0254         rtt_slot = rxrpc_begin_rtt_probe(call, serial, rxrpc_rtt_tx_ping);
0255 
0256     ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
0257     conn->params.peer->last_tx_at = ktime_get_seconds();
0258     if (ret < 0)
0259         trace_rxrpc_tx_fail(call->debug_id, serial, ret,
0260                     rxrpc_tx_point_call_ack);
0261     else
0262         trace_rxrpc_tx_packet(call->debug_id, &pkt->whdr,
0263                       rxrpc_tx_point_call_ack);
0264     rxrpc_tx_backoff(call, ret);
0265 
0266     if (call->state < RXRPC_CALL_COMPLETE) {
0267         if (ret < 0) {
0268             rxrpc_cancel_rtt_probe(call, serial, rtt_slot);
0269             rxrpc_propose_ACK(call, pkt->ack.reason,
0270                       ntohl(pkt->ack.serial),
0271                       false, true,
0272                       rxrpc_propose_ack_retry_tx);
0273         }
0274 
0275         rxrpc_set_keepalive(call);
0276     }
0277 
0278 out:
0279     kfree(pkt);
0280     return ret;
0281 }
0282 
0283 /*
0284  * Send an ABORT call packet.
0285  */
0286 int rxrpc_send_abort_packet(struct rxrpc_call *call)
0287 {
0288     struct rxrpc_connection *conn;
0289     struct rxrpc_abort_buffer pkt;
0290     struct msghdr msg;
0291     struct kvec iov[1];
0292     rxrpc_serial_t serial;
0293     int ret;
0294 
0295     /* Don't bother sending aborts for a client call once the server has
0296      * hard-ACK'd all of its request data.  After that point, we're not
0297      * going to stop the operation proceeding, and whilst we might limit
0298      * the reply, it's not worth it if we can send a new call on the same
0299      * channel instead, thereby closing off this call.
0300      */
0301     if (rxrpc_is_client_call(call) &&
0302         test_bit(RXRPC_CALL_TX_LAST, &call->flags))
0303         return 0;
0304 
0305     if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
0306         return -ECONNRESET;
0307 
0308     conn = call->conn;
0309 
0310     msg.msg_name    = &call->peer->srx.transport;
0311     msg.msg_namelen = call->peer->srx.transport_len;
0312     msg.msg_control = NULL;
0313     msg.msg_controllen = 0;
0314     msg.msg_flags   = 0;
0315 
0316     pkt.whdr.epoch      = htonl(conn->proto.epoch);
0317     pkt.whdr.cid        = htonl(call->cid);
0318     pkt.whdr.callNumber = htonl(call->call_id);
0319     pkt.whdr.seq        = 0;
0320     pkt.whdr.type       = RXRPC_PACKET_TYPE_ABORT;
0321     pkt.whdr.flags      = conn->out_clientflag;
0322     pkt.whdr.userStatus = 0;
0323     pkt.whdr.securityIndex  = call->security_ix;
0324     pkt.whdr._rsvd      = 0;
0325     pkt.whdr.serviceId  = htons(call->service_id);
0326     pkt.abort_code      = htonl(call->abort_code);
0327 
0328     iov[0].iov_base = &pkt;
0329     iov[0].iov_len  = sizeof(pkt);
0330 
0331     serial = atomic_inc_return(&conn->serial);
0332     pkt.whdr.serial = htonl(serial);
0333 
0334     ret = kernel_sendmsg(conn->params.local->socket,
0335                  &msg, iov, 1, sizeof(pkt));
0336     conn->params.peer->last_tx_at = ktime_get_seconds();
0337     if (ret < 0)
0338         trace_rxrpc_tx_fail(call->debug_id, serial, ret,
0339                     rxrpc_tx_point_call_abort);
0340     else
0341         trace_rxrpc_tx_packet(call->debug_id, &pkt.whdr,
0342                       rxrpc_tx_point_call_abort);
0343     rxrpc_tx_backoff(call, ret);
0344     return ret;
0345 }
0346 
0347 /*
0348  * send a packet through the transport endpoint
0349  */
0350 int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
0351                bool retrans)
0352 {
0353     struct rxrpc_connection *conn = call->conn;
0354     struct rxrpc_wire_header whdr;
0355     struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
0356     struct msghdr msg;
0357     struct kvec iov[2];
0358     rxrpc_serial_t serial;
0359     size_t len;
0360     int ret, rtt_slot = -1;
0361 
0362     _enter(",{%d}", skb->len);
0363 
0364     if (hlist_unhashed(&call->error_link)) {
0365         spin_lock_bh(&call->peer->lock);
0366         hlist_add_head_rcu(&call->error_link, &call->peer->error_targets);
0367         spin_unlock_bh(&call->peer->lock);
0368     }
0369 
0370     /* Each transmission of a Tx packet needs a new serial number */
0371     serial = atomic_inc_return(&conn->serial);
0372 
0373     whdr.epoch  = htonl(conn->proto.epoch);
0374     whdr.cid    = htonl(call->cid);
0375     whdr.callNumber = htonl(call->call_id);
0376     whdr.seq    = htonl(sp->hdr.seq);
0377     whdr.serial = htonl(serial);
0378     whdr.type   = RXRPC_PACKET_TYPE_DATA;
0379     whdr.flags  = sp->hdr.flags;
0380     whdr.userStatus = 0;
0381     whdr.securityIndex = call->security_ix;
0382     whdr._rsvd  = htons(sp->hdr._rsvd);
0383     whdr.serviceId  = htons(call->service_id);
0384 
0385     if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags) &&
0386         sp->hdr.seq == 1)
0387         whdr.userStatus = RXRPC_USERSTATUS_SERVICE_UPGRADE;
0388 
0389     iov[0].iov_base = &whdr;
0390     iov[0].iov_len = sizeof(whdr);
0391     iov[1].iov_base = skb->head;
0392     iov[1].iov_len = skb->len;
0393     len = iov[0].iov_len + iov[1].iov_len;
0394 
0395     msg.msg_name = &call->peer->srx.transport;
0396     msg.msg_namelen = call->peer->srx.transport_len;
0397     msg.msg_control = NULL;
0398     msg.msg_controllen = 0;
0399     msg.msg_flags = 0;
0400 
0401     /* If our RTT cache needs working on, request an ACK.  Also request
0402      * ACKs if a DATA packet appears to have been lost.
0403      *
0404      * However, we mustn't request an ACK on the last reply packet of a
0405      * service call, lest OpenAFS incorrectly send us an ACK with some
0406      * soft-ACKs in it and then never follow up with a proper hard ACK.
0407      */
0408     if ((!(sp->hdr.flags & RXRPC_LAST_PACKET) ||
0409          rxrpc_to_server(sp)
0410          ) &&
0411         (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events) ||
0412          retrans ||
0413          call->cong_mode == RXRPC_CALL_SLOW_START ||
0414          (call->peer->rtt_count < 3 && sp->hdr.seq & 1) ||
0415          ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000),
0416               ktime_get_real())))
0417         whdr.flags |= RXRPC_REQUEST_ACK;
0418 
0419     if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
0420         static int lose;
0421         if ((lose++ & 7) == 7) {
0422             ret = 0;
0423             trace_rxrpc_tx_data(call, sp->hdr.seq, serial,
0424                         whdr.flags, retrans, true);
0425             goto done;
0426         }
0427     }
0428 
0429     trace_rxrpc_tx_data(call, sp->hdr.seq, serial, whdr.flags, retrans,
0430                 false);
0431 
0432     /* send the packet with the don't fragment bit set if we currently
0433      * think it's small enough */
0434     if (iov[1].iov_len >= call->peer->maxdata)
0435         goto send_fragmentable;
0436 
0437     down_read(&conn->params.local->defrag_sem);
0438 
0439     sp->hdr.serial = serial;
0440     smp_wmb(); /* Set serial before timestamp */
0441     skb->tstamp = ktime_get_real();
0442     if (whdr.flags & RXRPC_REQUEST_ACK)
0443         rtt_slot = rxrpc_begin_rtt_probe(call, serial, rxrpc_rtt_tx_data);
0444 
0445     /* send the packet by UDP
0446      * - returns -EMSGSIZE if UDP would have to fragment the packet
0447      *   to go out of the interface
0448      *   - in which case, we'll have processed the ICMP error
0449      *     message and update the peer record
0450      */
0451     ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
0452     conn->params.peer->last_tx_at = ktime_get_seconds();
0453 
0454     up_read(&conn->params.local->defrag_sem);
0455     if (ret < 0) {
0456         rxrpc_cancel_rtt_probe(call, serial, rtt_slot);
0457         trace_rxrpc_tx_fail(call->debug_id, serial, ret,
0458                     rxrpc_tx_point_call_data_nofrag);
0459     } else {
0460         trace_rxrpc_tx_packet(call->debug_id, &whdr,
0461                       rxrpc_tx_point_call_data_nofrag);
0462     }
0463 
0464     rxrpc_tx_backoff(call, ret);
0465     if (ret == -EMSGSIZE)
0466         goto send_fragmentable;
0467 
0468 done:
0469     if (ret >= 0) {
0470         if (whdr.flags & RXRPC_REQUEST_ACK) {
0471             call->peer->rtt_last_req = skb->tstamp;
0472             if (call->peer->rtt_count > 1) {
0473                 unsigned long nowj = jiffies, ack_lost_at;
0474 
0475                 ack_lost_at = rxrpc_get_rto_backoff(call->peer, false);
0476                 ack_lost_at += nowj;
0477                 WRITE_ONCE(call->ack_lost_at, ack_lost_at);
0478                 rxrpc_reduce_call_timer(call, ack_lost_at, nowj,
0479                             rxrpc_timer_set_for_lost_ack);
0480             }
0481         }
0482 
0483         if (sp->hdr.seq == 1 &&
0484             !test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER,
0485                       &call->flags)) {
0486             unsigned long nowj = jiffies, expect_rx_by;
0487 
0488             expect_rx_by = nowj + call->next_rx_timo;
0489             WRITE_ONCE(call->expect_rx_by, expect_rx_by);
0490             rxrpc_reduce_call_timer(call, expect_rx_by, nowj,
0491                         rxrpc_timer_set_for_normal);
0492         }
0493 
0494         rxrpc_set_keepalive(call);
0495     } else {
0496         /* Cancel the call if the initial transmission fails,
0497          * particularly if that's due to network routing issues that
0498          * aren't going away anytime soon.  The layer above can arrange
0499          * the retransmission.
0500          */
0501         if (!test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER, &call->flags))
0502             rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
0503                           RX_USER_ABORT, ret);
0504     }
0505 
0506     _leave(" = %d [%u]", ret, call->peer->maxdata);
0507     return ret;
0508 
0509 send_fragmentable:
0510     /* attempt to send this message with fragmentation enabled */
0511     _debug("send fragment");
0512 
0513     down_write(&conn->params.local->defrag_sem);
0514 
0515     sp->hdr.serial = serial;
0516     smp_wmb(); /* Set serial before timestamp */
0517     skb->tstamp = ktime_get_real();
0518     if (whdr.flags & RXRPC_REQUEST_ACK)
0519         rtt_slot = rxrpc_begin_rtt_probe(call, serial, rxrpc_rtt_tx_data);
0520 
0521     switch (conn->params.local->srx.transport.family) {
0522     case AF_INET6:
0523     case AF_INET:
0524         ip_sock_set_mtu_discover(conn->params.local->socket->sk,
0525                 IP_PMTUDISC_DONT);
0526         ret = kernel_sendmsg(conn->params.local->socket, &msg,
0527                      iov, 2, len);
0528         conn->params.peer->last_tx_at = ktime_get_seconds();
0529 
0530         ip_sock_set_mtu_discover(conn->params.local->socket->sk,
0531                 IP_PMTUDISC_DO);
0532         break;
0533 
0534     default:
0535         BUG();
0536     }
0537 
0538     if (ret < 0) {
0539         rxrpc_cancel_rtt_probe(call, serial, rtt_slot);
0540         trace_rxrpc_tx_fail(call->debug_id, serial, ret,
0541                     rxrpc_tx_point_call_data_frag);
0542     } else {
0543         trace_rxrpc_tx_packet(call->debug_id, &whdr,
0544                       rxrpc_tx_point_call_data_frag);
0545     }
0546     rxrpc_tx_backoff(call, ret);
0547 
0548     up_write(&conn->params.local->defrag_sem);
0549     goto done;
0550 }
0551 
0552 /*
0553  * reject packets through the local endpoint
0554  */
0555 void rxrpc_reject_packets(struct rxrpc_local *local)
0556 {
0557     struct sockaddr_rxrpc srx;
0558     struct rxrpc_skb_priv *sp;
0559     struct rxrpc_wire_header whdr;
0560     struct sk_buff *skb;
0561     struct msghdr msg;
0562     struct kvec iov[2];
0563     size_t size;
0564     __be32 code;
0565     int ret, ioc;
0566 
0567     _enter("%d", local->debug_id);
0568 
0569     iov[0].iov_base = &whdr;
0570     iov[0].iov_len = sizeof(whdr);
0571     iov[1].iov_base = &code;
0572     iov[1].iov_len = sizeof(code);
0573 
0574     msg.msg_name = &srx.transport;
0575     msg.msg_control = NULL;
0576     msg.msg_controllen = 0;
0577     msg.msg_flags = 0;
0578 
0579     memset(&whdr, 0, sizeof(whdr));
0580 
0581     while ((skb = skb_dequeue(&local->reject_queue))) {
0582         rxrpc_see_skb(skb, rxrpc_skb_seen);
0583         sp = rxrpc_skb(skb);
0584 
0585         switch (skb->mark) {
0586         case RXRPC_SKB_MARK_REJECT_BUSY:
0587             whdr.type = RXRPC_PACKET_TYPE_BUSY;
0588             size = sizeof(whdr);
0589             ioc = 1;
0590             break;
0591         case RXRPC_SKB_MARK_REJECT_ABORT:
0592             whdr.type = RXRPC_PACKET_TYPE_ABORT;
0593             code = htonl(skb->priority);
0594             size = sizeof(whdr) + sizeof(code);
0595             ioc = 2;
0596             break;
0597         default:
0598             rxrpc_free_skb(skb, rxrpc_skb_freed);
0599             continue;
0600         }
0601 
0602         if (rxrpc_extract_addr_from_skb(&srx, skb) == 0) {
0603             msg.msg_namelen = srx.transport_len;
0604 
0605             whdr.epoch  = htonl(sp->hdr.epoch);
0606             whdr.cid    = htonl(sp->hdr.cid);
0607             whdr.callNumber = htonl(sp->hdr.callNumber);
0608             whdr.serviceId  = htons(sp->hdr.serviceId);
0609             whdr.flags  = sp->hdr.flags;
0610             whdr.flags  ^= RXRPC_CLIENT_INITIATED;
0611             whdr.flags  &= RXRPC_CLIENT_INITIATED;
0612 
0613             ret = kernel_sendmsg(local->socket, &msg,
0614                          iov, ioc, size);
0615             if (ret < 0)
0616                 trace_rxrpc_tx_fail(local->debug_id, 0, ret,
0617                             rxrpc_tx_point_reject);
0618             else
0619                 trace_rxrpc_tx_packet(local->debug_id, &whdr,
0620                               rxrpc_tx_point_reject);
0621         }
0622 
0623         rxrpc_free_skb(skb, rxrpc_skb_freed);
0624     }
0625 
0626     _leave("");
0627 }
0628 
0629 /*
0630  * Send a VERSION reply to a peer as a keepalive.
0631  */
0632 void rxrpc_send_keepalive(struct rxrpc_peer *peer)
0633 {
0634     struct rxrpc_wire_header whdr;
0635     struct msghdr msg;
0636     struct kvec iov[2];
0637     size_t len;
0638     int ret;
0639 
0640     _enter("");
0641 
0642     msg.msg_name    = &peer->srx.transport;
0643     msg.msg_namelen = peer->srx.transport_len;
0644     msg.msg_control = NULL;
0645     msg.msg_controllen = 0;
0646     msg.msg_flags   = 0;
0647 
0648     whdr.epoch  = htonl(peer->local->rxnet->epoch);
0649     whdr.cid    = 0;
0650     whdr.callNumber = 0;
0651     whdr.seq    = 0;
0652     whdr.serial = 0;
0653     whdr.type   = RXRPC_PACKET_TYPE_VERSION; /* Not client-initiated */
0654     whdr.flags  = RXRPC_LAST_PACKET;
0655     whdr.userStatus = 0;
0656     whdr.securityIndex = 0;
0657     whdr._rsvd  = 0;
0658     whdr.serviceId  = 0;
0659 
0660     iov[0].iov_base = &whdr;
0661     iov[0].iov_len  = sizeof(whdr);
0662     iov[1].iov_base = (char *)rxrpc_keepalive_string;
0663     iov[1].iov_len  = sizeof(rxrpc_keepalive_string);
0664 
0665     len = iov[0].iov_len + iov[1].iov_len;
0666 
0667     _proto("Tx VERSION (keepalive)");
0668 
0669     ret = kernel_sendmsg(peer->local->socket, &msg, iov, 2, len);
0670     if (ret < 0)
0671         trace_rxrpc_tx_fail(peer->debug_id, 0, ret,
0672                     rxrpc_tx_point_version_keepalive);
0673     else
0674         trace_rxrpc_tx_packet(peer->debug_id, &whdr,
0675                       rxrpc_tx_point_version_keepalive);
0676 
0677     peer->last_tx_at = ktime_get_seconds();
0678     _leave("");
0679 }
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