18c3e34a4SDavid Howells /* RxRPC packet transmission 28c3e34a4SDavid Howells * 38c3e34a4SDavid Howells * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 48c3e34a4SDavid Howells * Written by David Howells (dhowells@redhat.com) 58c3e34a4SDavid Howells * 68c3e34a4SDavid Howells * This program is free software; you can redistribute it and/or 78c3e34a4SDavid Howells * modify it under the terms of the GNU General Public License 88c3e34a4SDavid Howells * as published by the Free Software Foundation; either version 98c3e34a4SDavid Howells * 2 of the License, or (at your option) any later version. 108c3e34a4SDavid Howells */ 118c3e34a4SDavid Howells 128c3e34a4SDavid Howells #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 138c3e34a4SDavid Howells 148c3e34a4SDavid Howells #include <linux/net.h> 158c3e34a4SDavid Howells #include <linux/gfp.h> 168c3e34a4SDavid Howells #include <linux/skbuff.h> 178c3e34a4SDavid Howells #include <linux/export.h> 188c3e34a4SDavid Howells #include <net/sock.h> 198c3e34a4SDavid Howells #include <net/af_rxrpc.h> 208c3e34a4SDavid Howells #include "ar-internal.h" 218c3e34a4SDavid Howells 2226cb02aaSDavid Howells struct rxrpc_ack_buffer { 238d94aa38SDavid Howells struct rxrpc_wire_header whdr; 248d94aa38SDavid Howells struct rxrpc_ackpacket ack; 258d94aa38SDavid Howells u8 acks[255]; 268d94aa38SDavid Howells u8 pad[3]; 278d94aa38SDavid Howells struct rxrpc_ackinfo ackinfo; 288d94aa38SDavid Howells }; 298d94aa38SDavid Howells 3026cb02aaSDavid Howells struct rxrpc_abort_buffer { 3126cb02aaSDavid Howells struct rxrpc_wire_header whdr; 3226cb02aaSDavid Howells __be32 abort_code; 3326cb02aaSDavid Howells }; 3426cb02aaSDavid Howells 35ace45becSDavid Howells static const char rxrpc_keepalive_string[] = ""; 36ace45becSDavid Howells 378d94aa38SDavid Howells /* 38415f44e4SDavid Howells * Arrange for a keepalive ping a certain time after we last transmitted. This 39415f44e4SDavid Howells * lets the far side know we're still interested in this call and helps keep 40415f44e4SDavid Howells * the route through any intervening firewall open. 41415f44e4SDavid Howells * 42415f44e4SDavid Howells * Receiving a response to the ping will prevent the ->expect_rx_by timer from 43415f44e4SDavid Howells * expiring. 44415f44e4SDavid Howells */ 45415f44e4SDavid Howells static void rxrpc_set_keepalive(struct rxrpc_call *call) 46415f44e4SDavid Howells { 47415f44e4SDavid Howells unsigned long now = jiffies, keepalive_at = call->next_rx_timo / 6; 48415f44e4SDavid Howells 49415f44e4SDavid Howells keepalive_at += now; 50415f44e4SDavid Howells WRITE_ONCE(call->keepalive_at, keepalive_at); 51415f44e4SDavid Howells rxrpc_reduce_call_timer(call, keepalive_at, now, 52415f44e4SDavid Howells rxrpc_timer_set_for_keepalive); 53415f44e4SDavid Howells } 54415f44e4SDavid Howells 55415f44e4SDavid Howells /* 568d94aa38SDavid Howells * Fill out an ACK packet. 578d94aa38SDavid Howells */ 581457cc4cSDavid Howells static size_t rxrpc_fill_out_ack(struct rxrpc_connection *conn, 591457cc4cSDavid Howells struct rxrpc_call *call, 6026cb02aaSDavid Howells struct rxrpc_ack_buffer *pkt, 61805b21b9SDavid Howells rxrpc_seq_t *_hard_ack, 62a5af7e1fSDavid Howells rxrpc_seq_t *_top, 63a5af7e1fSDavid Howells u8 reason) 648d94aa38SDavid Howells { 65f3639df2SDavid Howells rxrpc_serial_t serial; 66248f219cSDavid Howells rxrpc_seq_t hard_ack, top, seq; 67248f219cSDavid Howells int ix; 688d94aa38SDavid Howells u32 mtu, jmax; 698d94aa38SDavid Howells u8 *ackp = pkt->acks; 708d94aa38SDavid Howells 71248f219cSDavid Howells /* Barrier against rxrpc_input_data(). */ 72f3639df2SDavid Howells serial = call->ackr_serial; 73248f219cSDavid Howells hard_ack = READ_ONCE(call->rx_hard_ack); 74248f219cSDavid Howells top = smp_load_acquire(&call->rx_top); 75805b21b9SDavid Howells *_hard_ack = hard_ack; 76805b21b9SDavid Howells *_top = top; 77248f219cSDavid Howells 788d94aa38SDavid Howells pkt->ack.bufferSpace = htons(8); 79248f219cSDavid Howells pkt->ack.maxSkew = htons(call->ackr_skew); 80248f219cSDavid Howells pkt->ack.firstPacket = htonl(hard_ack + 1); 818d94aa38SDavid Howells pkt->ack.previousPacket = htonl(call->ackr_prev_seq); 82f3639df2SDavid Howells pkt->ack.serial = htonl(serial); 83a5af7e1fSDavid Howells pkt->ack.reason = reason; 84248f219cSDavid Howells pkt->ack.nAcks = top - hard_ack; 858d94aa38SDavid Howells 86a5af7e1fSDavid Howells if (reason == RXRPC_ACK_PING) 878e83134dSDavid Howells pkt->whdr.flags |= RXRPC_REQUEST_ACK; 888e83134dSDavid Howells 89248f219cSDavid Howells if (after(top, hard_ack)) { 90248f219cSDavid Howells seq = hard_ack + 1; 91248f219cSDavid Howells do { 92248f219cSDavid Howells ix = seq & RXRPC_RXTX_BUFF_MASK; 93248f219cSDavid Howells if (call->rxtx_buffer[ix]) 94248f219cSDavid Howells *ackp++ = RXRPC_ACK_TYPE_ACK; 95248f219cSDavid Howells else 96248f219cSDavid Howells *ackp++ = RXRPC_ACK_TYPE_NACK; 97248f219cSDavid Howells seq++; 98248f219cSDavid Howells } while (before_eq(seq, top)); 99248f219cSDavid Howells } 100248f219cSDavid Howells 1011457cc4cSDavid Howells mtu = conn->params.peer->if_mtu; 1021457cc4cSDavid Howells mtu -= conn->params.peer->hdrsize; 10375e42126SDavid Howells jmax = (call->nr_jumbo_bad > 3) ? 1 : rxrpc_rx_jumbo_max; 1048d94aa38SDavid Howells pkt->ackinfo.rxMTU = htonl(rxrpc_rx_mtu); 1058d94aa38SDavid Howells pkt->ackinfo.maxMTU = htonl(mtu); 10675e42126SDavid Howells pkt->ackinfo.rwind = htonl(call->rx_winsize); 1078d94aa38SDavid Howells pkt->ackinfo.jumbo_max = htonl(jmax); 1088d94aa38SDavid Howells 1098d94aa38SDavid Howells *ackp++ = 0; 1108d94aa38SDavid Howells *ackp++ = 0; 1118d94aa38SDavid Howells *ackp++ = 0; 112248f219cSDavid Howells return top - hard_ack + 3; 1138d94aa38SDavid Howells } 1148d94aa38SDavid Howells 1158d94aa38SDavid Howells /* 11626cb02aaSDavid Howells * Send an ACK call packet. 1178d94aa38SDavid Howells */ 118bd1fdf8cSDavid Howells int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping, 119bd1fdf8cSDavid Howells rxrpc_serial_t *_serial) 1208d94aa38SDavid Howells { 1218d94aa38SDavid Howells struct rxrpc_connection *conn = NULL; 12226cb02aaSDavid Howells struct rxrpc_ack_buffer *pkt; 1238d94aa38SDavid Howells struct msghdr msg; 1248d94aa38SDavid Howells struct kvec iov[2]; 1258d94aa38SDavid Howells rxrpc_serial_t serial; 126805b21b9SDavid Howells rxrpc_seq_t hard_ack, top; 1278d94aa38SDavid Howells size_t len, n; 12826cb02aaSDavid Howells int ret; 129a5af7e1fSDavid Howells u8 reason; 1308d94aa38SDavid Howells 1318d94aa38SDavid Howells spin_lock_bh(&call->lock); 1328d94aa38SDavid Howells if (call->conn) 1338d94aa38SDavid Howells conn = rxrpc_get_connection_maybe(call->conn); 1348d94aa38SDavid Howells spin_unlock_bh(&call->lock); 1358d94aa38SDavid Howells if (!conn) 1368d94aa38SDavid Howells return -ECONNRESET; 1378d94aa38SDavid Howells 1388d94aa38SDavid Howells pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); 1398d94aa38SDavid Howells if (!pkt) { 1408d94aa38SDavid Howells rxrpc_put_connection(conn); 1418d94aa38SDavid Howells return -ENOMEM; 1428d94aa38SDavid Howells } 1438d94aa38SDavid Howells 1448d94aa38SDavid Howells msg.msg_name = &call->peer->srx.transport; 1458d94aa38SDavid Howells msg.msg_namelen = call->peer->srx.transport_len; 1468d94aa38SDavid Howells msg.msg_control = NULL; 1478d94aa38SDavid Howells msg.msg_controllen = 0; 1488d94aa38SDavid Howells msg.msg_flags = 0; 1498d94aa38SDavid Howells 1508d94aa38SDavid Howells pkt->whdr.epoch = htonl(conn->proto.epoch); 1518d94aa38SDavid Howells pkt->whdr.cid = htonl(call->cid); 1528d94aa38SDavid Howells pkt->whdr.callNumber = htonl(call->call_id); 1538d94aa38SDavid Howells pkt->whdr.seq = 0; 15426cb02aaSDavid Howells pkt->whdr.type = RXRPC_PACKET_TYPE_ACK; 15526cb02aaSDavid Howells pkt->whdr.flags = RXRPC_SLOW_START_OK | conn->out_clientflag; 1568d94aa38SDavid Howells pkt->whdr.userStatus = 0; 1578d94aa38SDavid Howells pkt->whdr.securityIndex = call->security_ix; 1588d94aa38SDavid Howells pkt->whdr._rsvd = 0; 1598d94aa38SDavid Howells pkt->whdr.serviceId = htons(call->service_id); 1608d94aa38SDavid Howells 1618d94aa38SDavid Howells spin_lock_bh(&call->lock); 162a5af7e1fSDavid Howells if (ping) { 163a5af7e1fSDavid Howells reason = RXRPC_ACK_PING; 164a5af7e1fSDavid Howells } else { 165a5af7e1fSDavid Howells reason = call->ackr_reason; 16627d0fc43SDavid Howells if (!call->ackr_reason) { 16727d0fc43SDavid Howells spin_unlock_bh(&call->lock); 16827d0fc43SDavid Howells ret = 0; 16927d0fc43SDavid Howells goto out; 17027d0fc43SDavid Howells } 1718d94aa38SDavid Howells call->ackr_reason = 0; 172a5af7e1fSDavid Howells } 1731457cc4cSDavid Howells n = rxrpc_fill_out_ack(conn, call, pkt, &hard_ack, &top, reason); 1748d94aa38SDavid Howells 1758d94aa38SDavid Howells spin_unlock_bh(&call->lock); 1768d94aa38SDavid Howells 17726cb02aaSDavid Howells iov[0].iov_base = pkt; 17826cb02aaSDavid Howells iov[0].iov_len = sizeof(pkt->whdr) + sizeof(pkt->ack) + n; 1798d94aa38SDavid Howells iov[1].iov_base = &pkt->ackinfo; 1808d94aa38SDavid Howells iov[1].iov_len = sizeof(pkt->ackinfo); 18126cb02aaSDavid Howells len = iov[0].iov_len + iov[1].iov_len; 1828d94aa38SDavid Howells 183b86e218eSDavid Howells serial = atomic_inc_return(&conn->serial); 184b86e218eSDavid Howells pkt->whdr.serial = htonl(serial); 1854764c0daSDavid Howells trace_rxrpc_tx_ack(call->debug_id, serial, 186b86e218eSDavid Howells ntohl(pkt->ack.firstPacket), 187b86e218eSDavid Howells ntohl(pkt->ack.serial), 188b86e218eSDavid Howells pkt->ack.reason, pkt->ack.nAcks); 189bd1fdf8cSDavid Howells if (_serial) 190bd1fdf8cSDavid Howells *_serial = serial; 191b86e218eSDavid Howells 1928e83134dSDavid Howells if (ping) { 193a5af7e1fSDavid Howells call->ping_serial = serial; 1948e83134dSDavid Howells smp_wmb(); 1958e83134dSDavid Howells /* We need to stick a time in before we send the packet in case 1968e83134dSDavid Howells * the reply gets back before kernel_sendmsg() completes - but 1978e83134dSDavid Howells * asking UDP to send the packet can take a relatively long 198b604dd98SDavid Howells * time. 1998e83134dSDavid Howells */ 200a5af7e1fSDavid Howells call->ping_time = ktime_get_real(); 2018e83134dSDavid Howells set_bit(RXRPC_CALL_PINGING, &call->flags); 2028e83134dSDavid Howells trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_ping, serial); 2038e83134dSDavid Howells } 20426cb02aaSDavid Howells 20526cb02aaSDavid Howells ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len); 206330bdcfaSDavid Howells conn->params.peer->last_tx_at = ktime_get_seconds(); 2076b47fe1dSDavid Howells if (ret < 0) 2086b47fe1dSDavid Howells trace_rxrpc_tx_fail(call->debug_id, serial, ret, 2094764c0daSDavid Howells rxrpc_tx_point_call_ack); 2104764c0daSDavid Howells else 2114764c0daSDavid Howells trace_rxrpc_tx_packet(call->debug_id, &pkt->whdr, 2124764c0daSDavid Howells rxrpc_tx_point_call_ack); 2138d94aa38SDavid Howells 21426cb02aaSDavid Howells if (call->state < RXRPC_CALL_COMPLETE) { 215805b21b9SDavid Howells if (ret < 0) { 216a5af7e1fSDavid Howells if (ping) 2178e83134dSDavid Howells clear_bit(RXRPC_CALL_PINGING, &call->flags); 218248f219cSDavid Howells rxrpc_propose_ACK(call, pkt->ack.reason, 219248f219cSDavid Howells ntohs(pkt->ack.maxSkew), 220248f219cSDavid Howells ntohl(pkt->ack.serial), 2219c7ad434SDavid Howells true, true, 2229c7ad434SDavid Howells rxrpc_propose_ack_retry_tx); 223805b21b9SDavid Howells } else { 224805b21b9SDavid Howells spin_lock_bh(&call->lock); 225805b21b9SDavid Howells if (after(hard_ack, call->ackr_consumed)) 226805b21b9SDavid Howells call->ackr_consumed = hard_ack; 227805b21b9SDavid Howells if (after(top, call->ackr_seen)) 228805b21b9SDavid Howells call->ackr_seen = top; 229805b21b9SDavid Howells spin_unlock_bh(&call->lock); 230248f219cSDavid Howells } 231415f44e4SDavid Howells 232415f44e4SDavid Howells rxrpc_set_keepalive(call); 233248f219cSDavid Howells } 234248f219cSDavid Howells 2358d94aa38SDavid Howells out: 2368d94aa38SDavid Howells rxrpc_put_connection(conn); 2378d94aa38SDavid Howells kfree(pkt); 2388d94aa38SDavid Howells return ret; 2398d94aa38SDavid Howells } 2408d94aa38SDavid Howells 2418c3e34a4SDavid Howells /* 24226cb02aaSDavid Howells * Send an ABORT call packet. 24326cb02aaSDavid Howells */ 24426cb02aaSDavid Howells int rxrpc_send_abort_packet(struct rxrpc_call *call) 24526cb02aaSDavid Howells { 24626cb02aaSDavid Howells struct rxrpc_connection *conn = NULL; 24726cb02aaSDavid Howells struct rxrpc_abort_buffer pkt; 24826cb02aaSDavid Howells struct msghdr msg; 24926cb02aaSDavid Howells struct kvec iov[1]; 25026cb02aaSDavid Howells rxrpc_serial_t serial; 25126cb02aaSDavid Howells int ret; 25226cb02aaSDavid Howells 253dcbefc30SDavid Howells /* Don't bother sending aborts for a client call once the server has 254dcbefc30SDavid Howells * hard-ACK'd all of its request data. After that point, we're not 255dcbefc30SDavid Howells * going to stop the operation proceeding, and whilst we might limit 256dcbefc30SDavid Howells * the reply, it's not worth it if we can send a new call on the same 257dcbefc30SDavid Howells * channel instead, thereby closing off this call. 258dcbefc30SDavid Howells */ 259dcbefc30SDavid Howells if (rxrpc_is_client_call(call) && 260dcbefc30SDavid Howells test_bit(RXRPC_CALL_TX_LAST, &call->flags)) 261dcbefc30SDavid Howells return 0; 262dcbefc30SDavid Howells 26326cb02aaSDavid Howells spin_lock_bh(&call->lock); 26426cb02aaSDavid Howells if (call->conn) 26526cb02aaSDavid Howells conn = rxrpc_get_connection_maybe(call->conn); 26626cb02aaSDavid Howells spin_unlock_bh(&call->lock); 26726cb02aaSDavid Howells if (!conn) 26826cb02aaSDavid Howells return -ECONNRESET; 26926cb02aaSDavid Howells 27026cb02aaSDavid Howells msg.msg_name = &call->peer->srx.transport; 27126cb02aaSDavid Howells msg.msg_namelen = call->peer->srx.transport_len; 27226cb02aaSDavid Howells msg.msg_control = NULL; 27326cb02aaSDavid Howells msg.msg_controllen = 0; 27426cb02aaSDavid Howells msg.msg_flags = 0; 27526cb02aaSDavid Howells 27626cb02aaSDavid Howells pkt.whdr.epoch = htonl(conn->proto.epoch); 27726cb02aaSDavid Howells pkt.whdr.cid = htonl(call->cid); 27826cb02aaSDavid Howells pkt.whdr.callNumber = htonl(call->call_id); 27926cb02aaSDavid Howells pkt.whdr.seq = 0; 28026cb02aaSDavid Howells pkt.whdr.type = RXRPC_PACKET_TYPE_ABORT; 28126cb02aaSDavid Howells pkt.whdr.flags = conn->out_clientflag; 28226cb02aaSDavid Howells pkt.whdr.userStatus = 0; 28326cb02aaSDavid Howells pkt.whdr.securityIndex = call->security_ix; 28426cb02aaSDavid Howells pkt.whdr._rsvd = 0; 28526cb02aaSDavid Howells pkt.whdr.serviceId = htons(call->service_id); 28626cb02aaSDavid Howells pkt.abort_code = htonl(call->abort_code); 28726cb02aaSDavid Howells 28826cb02aaSDavid Howells iov[0].iov_base = &pkt; 28926cb02aaSDavid Howells iov[0].iov_len = sizeof(pkt); 29026cb02aaSDavid Howells 29126cb02aaSDavid Howells serial = atomic_inc_return(&conn->serial); 29226cb02aaSDavid Howells pkt.whdr.serial = htonl(serial); 29326cb02aaSDavid Howells 29426cb02aaSDavid Howells ret = kernel_sendmsg(conn->params.local->socket, 29526cb02aaSDavid Howells &msg, iov, 1, sizeof(pkt)); 296330bdcfaSDavid Howells conn->params.peer->last_tx_at = ktime_get_seconds(); 2976b47fe1dSDavid Howells if (ret < 0) 2986b47fe1dSDavid Howells trace_rxrpc_tx_fail(call->debug_id, serial, ret, 2994764c0daSDavid Howells rxrpc_tx_point_call_abort); 3004764c0daSDavid Howells else 3014764c0daSDavid Howells trace_rxrpc_tx_packet(call->debug_id, &pkt.whdr, 3024764c0daSDavid Howells rxrpc_tx_point_call_abort); 3036b47fe1dSDavid Howells 30426cb02aaSDavid Howells 30526cb02aaSDavid Howells rxrpc_put_connection(conn); 30626cb02aaSDavid Howells return ret; 30726cb02aaSDavid Howells } 30826cb02aaSDavid Howells 30926cb02aaSDavid Howells /* 3108c3e34a4SDavid Howells * send a packet through the transport endpoint 3118c3e34a4SDavid Howells */ 312a1767077SDavid Howells int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb, 313a1767077SDavid Howells bool retrans) 3148c3e34a4SDavid Howells { 3155a924b89SDavid Howells struct rxrpc_connection *conn = call->conn; 3165a924b89SDavid Howells struct rxrpc_wire_header whdr; 3175a924b89SDavid Howells struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 3188c3e34a4SDavid Howells struct msghdr msg; 3195a924b89SDavid Howells struct kvec iov[2]; 3205a924b89SDavid Howells rxrpc_serial_t serial; 3215a924b89SDavid Howells size_t len; 322a1767077SDavid Howells bool lost = false; 3238c3e34a4SDavid Howells int ret, opt; 3248c3e34a4SDavid Howells 3258c3e34a4SDavid Howells _enter(",{%d}", skb->len); 3268c3e34a4SDavid Howells 3275a924b89SDavid Howells /* Each transmission of a Tx packet needs a new serial number */ 3285a924b89SDavid Howells serial = atomic_inc_return(&conn->serial); 3298c3e34a4SDavid Howells 3305a924b89SDavid Howells whdr.epoch = htonl(conn->proto.epoch); 3315a924b89SDavid Howells whdr.cid = htonl(call->cid); 3325a924b89SDavid Howells whdr.callNumber = htonl(call->call_id); 3335a924b89SDavid Howells whdr.seq = htonl(sp->hdr.seq); 3345a924b89SDavid Howells whdr.serial = htonl(serial); 3355a924b89SDavid Howells whdr.type = RXRPC_PACKET_TYPE_DATA; 3365a924b89SDavid Howells whdr.flags = sp->hdr.flags; 3375a924b89SDavid Howells whdr.userStatus = 0; 3385a924b89SDavid Howells whdr.securityIndex = call->security_ix; 3395a924b89SDavid Howells whdr._rsvd = htons(sp->hdr._rsvd); 3405a924b89SDavid Howells whdr.serviceId = htons(call->service_id); 3415a924b89SDavid Howells 3424e255721SDavid Howells if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags) && 3434e255721SDavid Howells sp->hdr.seq == 1) 3444e255721SDavid Howells whdr.userStatus = RXRPC_USERSTATUS_SERVICE_UPGRADE; 3454e255721SDavid Howells 3465a924b89SDavid Howells iov[0].iov_base = &whdr; 3475a924b89SDavid Howells iov[0].iov_len = sizeof(whdr); 3485a924b89SDavid Howells iov[1].iov_base = skb->head; 3495a924b89SDavid Howells iov[1].iov_len = skb->len; 3505a924b89SDavid Howells len = iov[0].iov_len + iov[1].iov_len; 3515a924b89SDavid Howells 3525a924b89SDavid Howells msg.msg_name = &call->peer->srx.transport; 3535a924b89SDavid Howells msg.msg_namelen = call->peer->srx.transport_len; 3548c3e34a4SDavid Howells msg.msg_control = NULL; 3558c3e34a4SDavid Howells msg.msg_controllen = 0; 3568c3e34a4SDavid Howells msg.msg_flags = 0; 3578c3e34a4SDavid Howells 35857494343SDavid Howells /* If our RTT cache needs working on, request an ACK. Also request 35957494343SDavid Howells * ACKs if a DATA packet appears to have been lost. 360b604dd98SDavid Howells * 361b604dd98SDavid Howells * However, we mustn't request an ACK on the last reply packet of a 362b604dd98SDavid Howells * service call, lest OpenAFS incorrectly send us an ACK with some 363b604dd98SDavid Howells * soft-ACKs in it and then never follow up with a proper hard ACK. 36457494343SDavid Howells */ 365b604dd98SDavid Howells if ((!(sp->hdr.flags & RXRPC_LAST_PACKET) || 366b604dd98SDavid Howells rxrpc_to_server(sp) 367b604dd98SDavid Howells ) && 368bd1fdf8cSDavid Howells (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events) || 369bd1fdf8cSDavid Howells retrans || 370b112a670SDavid Howells call->cong_mode == RXRPC_CALL_SLOW_START || 37157494343SDavid Howells (call->peer->rtt_usage < 3 && sp->hdr.seq & 1) || 3720d4b103cSDavid Howells ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), 373bf7d620aSDavid Howells ktime_get_real()))) 3740d4b103cSDavid Howells whdr.flags |= RXRPC_REQUEST_ACK; 3750d4b103cSDavid Howells 3768a681c36SDavid Howells if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) { 3778a681c36SDavid Howells static int lose; 3788a681c36SDavid Howells if ((lose++ & 7) == 7) { 379a1767077SDavid Howells ret = 0; 380a1767077SDavid Howells lost = true; 381a1767077SDavid Howells goto done; 3828a681c36SDavid Howells } 3838a681c36SDavid Howells } 3848a681c36SDavid Howells 3855a924b89SDavid Howells _proto("Tx DATA %%%u { #%u }", serial, sp->hdr.seq); 3865a924b89SDavid Howells 3878c3e34a4SDavid Howells /* send the packet with the don't fragment bit set if we currently 3888c3e34a4SDavid Howells * think it's small enough */ 3895a924b89SDavid Howells if (iov[1].iov_len >= call->peer->maxdata) 3905a924b89SDavid Howells goto send_fragmentable; 3915a924b89SDavid Howells 392985a5c82SDavid Howells down_read(&conn->params.local->defrag_sem); 393b604dd98SDavid Howells 394b604dd98SDavid Howells sp->hdr.serial = serial; 395b604dd98SDavid Howells smp_wmb(); /* Set serial before timestamp */ 396b604dd98SDavid Howells skb->tstamp = ktime_get_real(); 397b604dd98SDavid Howells 3988c3e34a4SDavid Howells /* send the packet by UDP 3998c3e34a4SDavid Howells * - returns -EMSGSIZE if UDP would have to fragment the packet 4008c3e34a4SDavid Howells * to go out of the interface 4018c3e34a4SDavid Howells * - in which case, we'll have processed the ICMP error 4028c3e34a4SDavid Howells * message and update the peer record 4038c3e34a4SDavid Howells */ 4045a924b89SDavid Howells ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len); 405330bdcfaSDavid Howells conn->params.peer->last_tx_at = ktime_get_seconds(); 4068c3e34a4SDavid Howells 407985a5c82SDavid Howells up_read(&conn->params.local->defrag_sem); 4086b47fe1dSDavid Howells if (ret < 0) 4096b47fe1dSDavid Howells trace_rxrpc_tx_fail(call->debug_id, serial, ret, 4104764c0daSDavid Howells rxrpc_tx_point_call_data_nofrag); 4114764c0daSDavid Howells else 4124764c0daSDavid Howells trace_rxrpc_tx_packet(call->debug_id, &whdr, 4134764c0daSDavid Howells rxrpc_tx_point_call_data_nofrag); 4148c3e34a4SDavid Howells if (ret == -EMSGSIZE) 4158c3e34a4SDavid Howells goto send_fragmentable; 4168c3e34a4SDavid Howells 4175a924b89SDavid Howells done: 418a1767077SDavid Howells trace_rxrpc_tx_data(call, sp->hdr.seq, serial, whdr.flags, 419a1767077SDavid Howells retrans, lost); 42050235c4bSDavid Howells if (ret >= 0) { 4210d4b103cSDavid Howells if (whdr.flags & RXRPC_REQUEST_ACK) { 422b604dd98SDavid Howells call->peer->rtt_last_req = skb->tstamp; 42350235c4bSDavid Howells trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_data, serial); 424bd1fdf8cSDavid Howells if (call->peer->rtt_usage > 1) { 425bd1fdf8cSDavid Howells unsigned long nowj = jiffies, ack_lost_at; 426bd1fdf8cSDavid Howells 427bd1fdf8cSDavid Howells ack_lost_at = nsecs_to_jiffies(2 * call->peer->rtt); 428bd1fdf8cSDavid Howells if (ack_lost_at < 1) 429bd1fdf8cSDavid Howells ack_lost_at = 1; 430bd1fdf8cSDavid Howells 431bd1fdf8cSDavid Howells ack_lost_at += nowj; 432bd1fdf8cSDavid Howells WRITE_ONCE(call->ack_lost_at, ack_lost_at); 433bd1fdf8cSDavid Howells rxrpc_reduce_call_timer(call, ack_lost_at, nowj, 434bd1fdf8cSDavid Howells rxrpc_timer_set_for_lost_ack); 435bd1fdf8cSDavid Howells } 4368c3e34a4SDavid Howells } 437c54e43d7SDavid Howells 438c54e43d7SDavid Howells if (sp->hdr.seq == 1 && 439c54e43d7SDavid Howells !test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER, 440c54e43d7SDavid Howells &call->flags)) { 441c54e43d7SDavid Howells unsigned long nowj = jiffies, expect_rx_by; 442c54e43d7SDavid Howells 443c54e43d7SDavid Howells expect_rx_by = nowj + call->next_rx_timo; 444c54e43d7SDavid Howells WRITE_ONCE(call->expect_rx_by, expect_rx_by); 445c54e43d7SDavid Howells rxrpc_reduce_call_timer(call, expect_rx_by, nowj, 446c54e43d7SDavid Howells rxrpc_timer_set_for_normal); 447c54e43d7SDavid Howells } 4480d4b103cSDavid Howells } 449415f44e4SDavid Howells 450415f44e4SDavid Howells rxrpc_set_keepalive(call); 451415f44e4SDavid Howells 4525a924b89SDavid Howells _leave(" = %d [%u]", ret, call->peer->maxdata); 4535a924b89SDavid Howells return ret; 4548c3e34a4SDavid Howells 4558c3e34a4SDavid Howells send_fragmentable: 4568c3e34a4SDavid Howells /* attempt to send this message with fragmentation enabled */ 4578c3e34a4SDavid Howells _debug("send fragment"); 4588c3e34a4SDavid Howells 459985a5c82SDavid Howells down_write(&conn->params.local->defrag_sem); 460985a5c82SDavid Howells 461b604dd98SDavid Howells sp->hdr.serial = serial; 462b604dd98SDavid Howells smp_wmb(); /* Set serial before timestamp */ 463b604dd98SDavid Howells skb->tstamp = ktime_get_real(); 464b604dd98SDavid Howells 465985a5c82SDavid Howells switch (conn->params.local->srx.transport.family) { 466985a5c82SDavid Howells case AF_INET: 4678c3e34a4SDavid Howells opt = IP_PMTUDISC_DONT; 468985a5c82SDavid Howells ret = kernel_setsockopt(conn->params.local->socket, 469985a5c82SDavid Howells SOL_IP, IP_MTU_DISCOVER, 4708c3e34a4SDavid Howells (char *)&opt, sizeof(opt)); 4718c3e34a4SDavid Howells if (ret == 0) { 4725a924b89SDavid Howells ret = kernel_sendmsg(conn->params.local->socket, &msg, 4735a924b89SDavid Howells iov, 2, len); 474330bdcfaSDavid Howells conn->params.peer->last_tx_at = ktime_get_seconds(); 4758c3e34a4SDavid Howells 4768c3e34a4SDavid Howells opt = IP_PMTUDISC_DO; 477985a5c82SDavid Howells kernel_setsockopt(conn->params.local->socket, SOL_IP, 478985a5c82SDavid Howells IP_MTU_DISCOVER, 479985a5c82SDavid Howells (char *)&opt, sizeof(opt)); 480985a5c82SDavid Howells } 481985a5c82SDavid Howells break; 48275b54cb5SDavid Howells 483d1912747SDavid Howells #ifdef CONFIG_AF_RXRPC_IPV6 48475b54cb5SDavid Howells case AF_INET6: 48575b54cb5SDavid Howells opt = IPV6_PMTUDISC_DONT; 48675b54cb5SDavid Howells ret = kernel_setsockopt(conn->params.local->socket, 48775b54cb5SDavid Howells SOL_IPV6, IPV6_MTU_DISCOVER, 48875b54cb5SDavid Howells (char *)&opt, sizeof(opt)); 48975b54cb5SDavid Howells if (ret == 0) { 49075b54cb5SDavid Howells ret = kernel_sendmsg(conn->params.local->socket, &msg, 49193c62c45SDavid Howells iov, 2, len); 492330bdcfaSDavid Howells conn->params.peer->last_tx_at = ktime_get_seconds(); 49375b54cb5SDavid Howells 49475b54cb5SDavid Howells opt = IPV6_PMTUDISC_DO; 49575b54cb5SDavid Howells kernel_setsockopt(conn->params.local->socket, 49675b54cb5SDavid Howells SOL_IPV6, IPV6_MTU_DISCOVER, 49775b54cb5SDavid Howells (char *)&opt, sizeof(opt)); 49875b54cb5SDavid Howells } 49975b54cb5SDavid Howells break; 500d1912747SDavid Howells #endif 5018c3e34a4SDavid Howells } 5028c3e34a4SDavid Howells 5036b47fe1dSDavid Howells if (ret < 0) 5046b47fe1dSDavid Howells trace_rxrpc_tx_fail(call->debug_id, serial, ret, 5054764c0daSDavid Howells rxrpc_tx_point_call_data_frag); 5064764c0daSDavid Howells else 5074764c0daSDavid Howells trace_rxrpc_tx_packet(call->debug_id, &whdr, 5084764c0daSDavid Howells rxrpc_tx_point_call_data_frag); 5096b47fe1dSDavid Howells 510985a5c82SDavid Howells up_write(&conn->params.local->defrag_sem); 5115a924b89SDavid Howells goto done; 5128c3e34a4SDavid Howells } 513248f219cSDavid Howells 514248f219cSDavid Howells /* 515248f219cSDavid Howells * reject packets through the local endpoint 516248f219cSDavid Howells */ 517248f219cSDavid Howells void rxrpc_reject_packets(struct rxrpc_local *local) 518248f219cSDavid Howells { 5191c2bc7b9SDavid Howells struct sockaddr_rxrpc srx; 520248f219cSDavid Howells struct rxrpc_skb_priv *sp; 521248f219cSDavid Howells struct rxrpc_wire_header whdr; 522248f219cSDavid Howells struct sk_buff *skb; 523248f219cSDavid Howells struct msghdr msg; 524248f219cSDavid Howells struct kvec iov[2]; 525248f219cSDavid Howells size_t size; 526248f219cSDavid Howells __be32 code; 527ece64fecSDavid Howells int ret, ioc; 528248f219cSDavid Howells 529248f219cSDavid Howells _enter("%d", local->debug_id); 530248f219cSDavid Howells 531248f219cSDavid Howells iov[0].iov_base = &whdr; 532248f219cSDavid Howells iov[0].iov_len = sizeof(whdr); 533248f219cSDavid Howells iov[1].iov_base = &code; 534248f219cSDavid Howells iov[1].iov_len = sizeof(code); 535248f219cSDavid Howells 5361c2bc7b9SDavid Howells msg.msg_name = &srx.transport; 537248f219cSDavid Howells msg.msg_control = NULL; 538248f219cSDavid Howells msg.msg_controllen = 0; 539248f219cSDavid Howells msg.msg_flags = 0; 540248f219cSDavid Howells 541248f219cSDavid Howells memset(&whdr, 0, sizeof(whdr)); 542248f219cSDavid Howells 543248f219cSDavid Howells while ((skb = skb_dequeue(&local->reject_queue))) { 54471f3ca40SDavid Howells rxrpc_see_skb(skb, rxrpc_skb_rx_seen); 545248f219cSDavid Howells sp = rxrpc_skb(skb); 5461c2bc7b9SDavid Howells 547ece64fecSDavid Howells switch (skb->mark) { 548ece64fecSDavid Howells case RXRPC_SKB_MARK_REJECT_BUSY: 549ece64fecSDavid Howells whdr.type = RXRPC_PACKET_TYPE_BUSY; 550ece64fecSDavid Howells size = sizeof(whdr); 551ece64fecSDavid Howells ioc = 1; 552ece64fecSDavid Howells break; 553ece64fecSDavid Howells case RXRPC_SKB_MARK_REJECT_ABORT: 554ece64fecSDavid Howells whdr.type = RXRPC_PACKET_TYPE_ABORT; 555ece64fecSDavid Howells code = htonl(skb->priority); 556ece64fecSDavid Howells size = sizeof(whdr) + sizeof(code); 557ece64fecSDavid Howells ioc = 2; 558ece64fecSDavid Howells break; 559ece64fecSDavid Howells default: 560ece64fecSDavid Howells rxrpc_free_skb(skb, rxrpc_skb_rx_freed); 561ece64fecSDavid Howells continue; 562ece64fecSDavid Howells } 563ece64fecSDavid Howells 5647b674e39SDavid Howells if (rxrpc_extract_addr_from_skb(local, &srx, skb) == 0) { 5651c2bc7b9SDavid Howells msg.msg_namelen = srx.transport_len; 5661c2bc7b9SDavid Howells 567248f219cSDavid Howells whdr.epoch = htonl(sp->hdr.epoch); 568248f219cSDavid Howells whdr.cid = htonl(sp->hdr.cid); 569248f219cSDavid Howells whdr.callNumber = htonl(sp->hdr.callNumber); 570248f219cSDavid Howells whdr.serviceId = htons(sp->hdr.serviceId); 571248f219cSDavid Howells whdr.flags = sp->hdr.flags; 572248f219cSDavid Howells whdr.flags ^= RXRPC_CLIENT_INITIATED; 573248f219cSDavid Howells whdr.flags &= RXRPC_CLIENT_INITIATED; 574248f219cSDavid Howells 5756b47fe1dSDavid Howells ret = kernel_sendmsg(local->socket, &msg, iov, 2, size); 5766b47fe1dSDavid Howells if (ret < 0) 5776b47fe1dSDavid Howells trace_rxrpc_tx_fail(local->debug_id, 0, ret, 5784764c0daSDavid Howells rxrpc_tx_point_reject); 5794764c0daSDavid Howells else 5804764c0daSDavid Howells trace_rxrpc_tx_packet(local->debug_id, &whdr, 5814764c0daSDavid Howells rxrpc_tx_point_reject); 582248f219cSDavid Howells } 583248f219cSDavid Howells 58471f3ca40SDavid Howells rxrpc_free_skb(skb, rxrpc_skb_rx_freed); 585248f219cSDavid Howells } 586248f219cSDavid Howells 587248f219cSDavid Howells _leave(""); 588248f219cSDavid Howells } 589ace45becSDavid Howells 590ace45becSDavid Howells /* 591ace45becSDavid Howells * Send a VERSION reply to a peer as a keepalive. 592ace45becSDavid Howells */ 593ace45becSDavid Howells void rxrpc_send_keepalive(struct rxrpc_peer *peer) 594ace45becSDavid Howells { 595ace45becSDavid Howells struct rxrpc_wire_header whdr; 596ace45becSDavid Howells struct msghdr msg; 597ace45becSDavid Howells struct kvec iov[2]; 598ace45becSDavid Howells size_t len; 599ace45becSDavid Howells int ret; 600ace45becSDavid Howells 601ace45becSDavid Howells _enter(""); 602ace45becSDavid Howells 603ace45becSDavid Howells msg.msg_name = &peer->srx.transport; 604ace45becSDavid Howells msg.msg_namelen = peer->srx.transport_len; 605ace45becSDavid Howells msg.msg_control = NULL; 606ace45becSDavid Howells msg.msg_controllen = 0; 607ace45becSDavid Howells msg.msg_flags = 0; 608ace45becSDavid Howells 609ace45becSDavid Howells whdr.epoch = htonl(peer->local->rxnet->epoch); 610ace45becSDavid Howells whdr.cid = 0; 611ace45becSDavid Howells whdr.callNumber = 0; 612ace45becSDavid Howells whdr.seq = 0; 613ace45becSDavid Howells whdr.serial = 0; 614ace45becSDavid Howells whdr.type = RXRPC_PACKET_TYPE_VERSION; /* Not client-initiated */ 615ace45becSDavid Howells whdr.flags = RXRPC_LAST_PACKET; 616ace45becSDavid Howells whdr.userStatus = 0; 617ace45becSDavid Howells whdr.securityIndex = 0; 618ace45becSDavid Howells whdr._rsvd = 0; 619ace45becSDavid Howells whdr.serviceId = 0; 620ace45becSDavid Howells 621ace45becSDavid Howells iov[0].iov_base = &whdr; 622ace45becSDavid Howells iov[0].iov_len = sizeof(whdr); 623ace45becSDavid Howells iov[1].iov_base = (char *)rxrpc_keepalive_string; 624ace45becSDavid Howells iov[1].iov_len = sizeof(rxrpc_keepalive_string); 625ace45becSDavid Howells 626ace45becSDavid Howells len = iov[0].iov_len + iov[1].iov_len; 627ace45becSDavid Howells 628ace45becSDavid Howells _proto("Tx VERSION (keepalive)"); 629ace45becSDavid Howells 630ace45becSDavid Howells ret = kernel_sendmsg(peer->local->socket, &msg, iov, 2, len); 631ace45becSDavid Howells if (ret < 0) 6326b47fe1dSDavid Howells trace_rxrpc_tx_fail(peer->debug_id, 0, ret, 6334764c0daSDavid Howells rxrpc_tx_point_version_keepalive); 6344764c0daSDavid Howells else 6354764c0daSDavid Howells trace_rxrpc_tx_packet(peer->debug_id, &whdr, 6364764c0daSDavid Howells rxrpc_tx_point_version_keepalive); 637ace45becSDavid Howells 638330bdcfaSDavid Howells peer->last_tx_at = ktime_get_seconds(); 639ace45becSDavid Howells _leave(""); 640ace45becSDavid Howells } 641