12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 28c3e34a4SDavid Howells /* connection-level event handling 38c3e34a4SDavid Howells * 48c3e34a4SDavid Howells * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 58c3e34a4SDavid Howells * Written by David Howells (dhowells@redhat.com) 68c3e34a4SDavid Howells */ 78c3e34a4SDavid Howells 88c3e34a4SDavid Howells #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 98c3e34a4SDavid Howells 108c3e34a4SDavid Howells #include <linux/module.h> 118c3e34a4SDavid Howells #include <linux/net.h> 128c3e34a4SDavid Howells #include <linux/skbuff.h> 138c3e34a4SDavid Howells #include <linux/errqueue.h> 148c3e34a4SDavid Howells #include <net/sock.h> 158c3e34a4SDavid Howells #include <net/af_rxrpc.h> 168c3e34a4SDavid Howells #include <net/ip.h> 178c3e34a4SDavid Howells #include "ar-internal.h" 188c3e34a4SDavid Howells 198c3e34a4SDavid Howells /* 2018bfeba5SDavid Howells * Retransmit terminal ACK or ABORT of the previous call. 2118bfeba5SDavid Howells */ 22f5c17aaeSDavid Howells static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, 233136ef49SDavid Howells struct sk_buff *skb, 243136ef49SDavid Howells unsigned int channel) 2518bfeba5SDavid Howells { 263136ef49SDavid Howells struct rxrpc_skb_priv *sp = skb ? rxrpc_skb(skb) : NULL; 2718bfeba5SDavid Howells struct rxrpc_channel *chan; 2818bfeba5SDavid Howells struct msghdr msg; 295fc62f6aSDavid Howells struct kvec iov[3]; 3018bfeba5SDavid Howells struct { 3118bfeba5SDavid Howells struct rxrpc_wire_header whdr; 3218bfeba5SDavid Howells union { 335fc62f6aSDavid Howells __be32 abort_code; 3418bfeba5SDavid Howells struct rxrpc_ackpacket ack; 3518bfeba5SDavid Howells }; 3618bfeba5SDavid Howells } __attribute__((packed)) pkt; 375fc62f6aSDavid Howells struct rxrpc_ackinfo ack_info; 3818bfeba5SDavid Howells size_t len; 396b47fe1dSDavid Howells int ret, ioc; 405fc62f6aSDavid Howells u32 serial, mtu, call_id, padding; 4118bfeba5SDavid Howells 4218bfeba5SDavid Howells _enter("%d", conn->debug_id); 4318bfeba5SDavid Howells 443136ef49SDavid Howells chan = &conn->channels[channel]; 4518bfeba5SDavid Howells 4618bfeba5SDavid Howells /* If the last call got moved on whilst we were waiting to run, just 4718bfeba5SDavid Howells * ignore this packet. 4818bfeba5SDavid Howells */ 4918bfeba5SDavid Howells call_id = READ_ONCE(chan->last_call); 5018bfeba5SDavid Howells /* Sync with __rxrpc_disconnect_call() */ 5118bfeba5SDavid Howells smp_rmb(); 523136ef49SDavid Howells if (skb && call_id != sp->hdr.callNumber) 5318bfeba5SDavid Howells return; 5418bfeba5SDavid Howells 5518bfeba5SDavid Howells msg.msg_name = &conn->params.peer->srx.transport; 5618bfeba5SDavid Howells msg.msg_namelen = conn->params.peer->srx.transport_len; 5718bfeba5SDavid Howells msg.msg_control = NULL; 5818bfeba5SDavid Howells msg.msg_controllen = 0; 5918bfeba5SDavid Howells msg.msg_flags = 0; 6018bfeba5SDavid Howells 615fc62f6aSDavid Howells iov[0].iov_base = &pkt; 625fc62f6aSDavid Howells iov[0].iov_len = sizeof(pkt.whdr); 635fc62f6aSDavid Howells iov[1].iov_base = &padding; 645fc62f6aSDavid Howells iov[1].iov_len = 3; 655fc62f6aSDavid Howells iov[2].iov_base = &ack_info; 665fc62f6aSDavid Howells iov[2].iov_len = sizeof(ack_info); 675fc62f6aSDavid Howells 683136ef49SDavid Howells pkt.whdr.epoch = htonl(conn->proto.epoch); 69fb1967a6SDavid Howells pkt.whdr.cid = htonl(conn->proto.cid | channel); 703136ef49SDavid Howells pkt.whdr.callNumber = htonl(call_id); 7118bfeba5SDavid Howells pkt.whdr.seq = 0; 7218bfeba5SDavid Howells pkt.whdr.type = chan->last_type; 7318bfeba5SDavid Howells pkt.whdr.flags = conn->out_clientflag; 7418bfeba5SDavid Howells pkt.whdr.userStatus = 0; 7518bfeba5SDavid Howells pkt.whdr.securityIndex = conn->security_ix; 7618bfeba5SDavid Howells pkt.whdr._rsvd = 0; 7768d6d1aeSDavid Howells pkt.whdr.serviceId = htons(conn->service_id); 7818bfeba5SDavid Howells 7918bfeba5SDavid Howells len = sizeof(pkt.whdr); 8018bfeba5SDavid Howells switch (chan->last_type) { 8118bfeba5SDavid Howells case RXRPC_PACKET_TYPE_ABORT: 825fc62f6aSDavid Howells pkt.abort_code = htonl(chan->last_abort); 835fc62f6aSDavid Howells iov[0].iov_len += sizeof(pkt.abort_code); 845fc62f6aSDavid Howells len += sizeof(pkt.abort_code); 855fc62f6aSDavid Howells ioc = 1; 8618bfeba5SDavid Howells break; 8718bfeba5SDavid Howells 8818bfeba5SDavid Howells case RXRPC_PACKET_TYPE_ACK: 8918bfeba5SDavid Howells mtu = conn->params.peer->if_mtu; 9018bfeba5SDavid Howells mtu -= conn->params.peer->hdrsize; 9118bfeba5SDavid Howells pkt.ack.bufferSpace = 0; 923136ef49SDavid Howells pkt.ack.maxSkew = htons(skb ? skb->priority : 0); 933136ef49SDavid Howells pkt.ack.firstPacket = htonl(chan->last_seq + 1); 943136ef49SDavid Howells pkt.ack.previousPacket = htonl(chan->last_seq); 953136ef49SDavid Howells pkt.ack.serial = htonl(skb ? sp->hdr.serial : 0); 963136ef49SDavid Howells pkt.ack.reason = skb ? RXRPC_ACK_DUPLICATE : RXRPC_ACK_IDLE; 9718bfeba5SDavid Howells pkt.ack.nAcks = 0; 985fc62f6aSDavid Howells ack_info.rxMTU = htonl(rxrpc_rx_mtu); 995fc62f6aSDavid Howells ack_info.maxMTU = htonl(mtu); 1005fc62f6aSDavid Howells ack_info.rwind = htonl(rxrpc_rx_window_size); 1015fc62f6aSDavid Howells ack_info.jumbo_max = htonl(rxrpc_rx_jumbo_max); 10257494343SDavid Howells pkt.whdr.flags |= RXRPC_SLOW_START_OK; 1035fc62f6aSDavid Howells padding = 0; 1045fc62f6aSDavid Howells iov[0].iov_len += sizeof(pkt.ack); 1055fc62f6aSDavid Howells len += sizeof(pkt.ack) + 3 + sizeof(ack_info); 1065fc62f6aSDavid Howells ioc = 3; 10718bfeba5SDavid Howells break; 1085fc62f6aSDavid Howells 1095fc62f6aSDavid Howells default: 1105fc62f6aSDavid Howells return; 11118bfeba5SDavid Howells } 11218bfeba5SDavid Howells 11318bfeba5SDavid Howells /* Resync with __rxrpc_disconnect_call() and check that the last call 11418bfeba5SDavid Howells * didn't get advanced whilst we were filling out the packets. 11518bfeba5SDavid Howells */ 11618bfeba5SDavid Howells smp_rmb(); 11718bfeba5SDavid Howells if (READ_ONCE(chan->last_call) != call_id) 11818bfeba5SDavid Howells return; 11918bfeba5SDavid Howells 12018bfeba5SDavid Howells serial = atomic_inc_return(&conn->serial); 12118bfeba5SDavid Howells pkt.whdr.serial = htonl(serial); 12218bfeba5SDavid Howells 12318bfeba5SDavid Howells switch (chan->last_type) { 12418bfeba5SDavid Howells case RXRPC_PACKET_TYPE_ABORT: 12564753092SDavid Howells _proto("Tx ABORT %%%u { %d } [re]", serial, conn->abort_code); 12618bfeba5SDavid Howells break; 12718bfeba5SDavid Howells case RXRPC_PACKET_TYPE_ACK: 1284764c0daSDavid Howells trace_rxrpc_tx_ack(chan->call_debug_id, serial, 129f3f8337cSDavid Howells ntohl(pkt.ack.firstPacket), 130f3f8337cSDavid Howells ntohl(pkt.ack.serial), 131f3f8337cSDavid Howells pkt.ack.reason, 0); 13218bfeba5SDavid Howells _proto("Tx ACK %%%u [re]", serial); 13318bfeba5SDavid Howells break; 13418bfeba5SDavid Howells } 13518bfeba5SDavid Howells 1366b47fe1dSDavid Howells ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, ioc, len); 137330bdcfaSDavid Howells conn->params.peer->last_tx_at = ktime_get_seconds(); 1386b47fe1dSDavid Howells if (ret < 0) 1394764c0daSDavid Howells trace_rxrpc_tx_fail(chan->call_debug_id, serial, ret, 1404764c0daSDavid Howells rxrpc_tx_point_call_final_resend); 1414764c0daSDavid Howells else 1424764c0daSDavid Howells trace_rxrpc_tx_packet(chan->call_debug_id, &pkt.whdr, 1434764c0daSDavid Howells rxrpc_tx_point_call_final_resend); 1446b47fe1dSDavid Howells 14518bfeba5SDavid Howells _leave(""); 14618bfeba5SDavid Howells } 14718bfeba5SDavid Howells 14818bfeba5SDavid Howells /* 1498c3e34a4SDavid Howells * pass a connection-level abort onto all calls on that connection 1508c3e34a4SDavid Howells */ 151f5c17aaeSDavid Howells static void rxrpc_abort_calls(struct rxrpc_connection *conn, 15239ce6755SDavid Howells enum rxrpc_call_completion compl, 15339ce6755SDavid Howells rxrpc_serial_t serial) 1548c3e34a4SDavid Howells { 1558c3e34a4SDavid Howells struct rxrpc_call *call; 156248f219cSDavid Howells int i; 1578c3e34a4SDavid Howells 15864753092SDavid Howells _enter("{%d},%x", conn->debug_id, conn->abort_code); 1598c3e34a4SDavid Howells 160a1399f8bSDavid Howells spin_lock(&conn->channel_lock); 1618c3e34a4SDavid Howells 162a1399f8bSDavid Howells for (i = 0; i < RXRPC_MAXCALLS; i++) { 163a1399f8bSDavid Howells call = rcu_dereference_protected( 164a1399f8bSDavid Howells conn->channels[i].call, 165a1399f8bSDavid Howells lockdep_is_held(&conn->channel_lock)); 166ccbd3dbeSDavid Howells if (call) { 1675a42976dSDavid Howells if (compl == RXRPC_CALL_LOCALLY_ABORTED) 168a25e21f0SDavid Howells trace_rxrpc_abort(call->debug_id, 169a25e21f0SDavid Howells "CON", call->cid, 1705a42976dSDavid Howells call->call_id, 0, 17164753092SDavid Howells conn->abort_code, 17264753092SDavid Howells conn->error); 17339ce6755SDavid Howells else 17439ce6755SDavid Howells trace_rxrpc_rx_abort(call, serial, 17539ce6755SDavid Howells conn->abort_code); 176248f219cSDavid Howells if (rxrpc_set_call_completion(call, compl, 17764753092SDavid Howells conn->abort_code, 17864753092SDavid Howells conn->error)) 179248f219cSDavid Howells rxrpc_notify_socket(call); 1808c3e34a4SDavid Howells } 181ccbd3dbeSDavid Howells } 1828c3e34a4SDavid Howells 183a1399f8bSDavid Howells spin_unlock(&conn->channel_lock); 1848c3e34a4SDavid Howells _leave(""); 1858c3e34a4SDavid Howells } 1868c3e34a4SDavid Howells 1878c3e34a4SDavid Howells /* 1888c3e34a4SDavid Howells * generate a connection-level abort 1898c3e34a4SDavid Howells */ 1908c3e34a4SDavid Howells static int rxrpc_abort_connection(struct rxrpc_connection *conn, 1913a92789aSDavid Howells int error, u32 abort_code) 1928c3e34a4SDavid Howells { 1938c3e34a4SDavid Howells struct rxrpc_wire_header whdr; 1948c3e34a4SDavid Howells struct msghdr msg; 1958c3e34a4SDavid Howells struct kvec iov[2]; 1968c3e34a4SDavid Howells __be32 word; 1978c3e34a4SDavid Howells size_t len; 1988c3e34a4SDavid Howells u32 serial; 1998c3e34a4SDavid Howells int ret; 2008c3e34a4SDavid Howells 2018c3e34a4SDavid Howells _enter("%d,,%u,%u", conn->debug_id, error, abort_code); 2028c3e34a4SDavid Howells 2038c3e34a4SDavid Howells /* generate a connection-level abort */ 2048c3e34a4SDavid Howells spin_lock_bh(&conn->state_lock); 205f5c17aaeSDavid Howells if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { 2068c3e34a4SDavid Howells spin_unlock_bh(&conn->state_lock); 2078c3e34a4SDavid Howells _leave(" = 0 [already dead]"); 2088c3e34a4SDavid Howells return 0; 2098c3e34a4SDavid Howells } 2108c3e34a4SDavid Howells 21164753092SDavid Howells conn->error = error; 21264753092SDavid Howells conn->abort_code = abort_code; 213f5c17aaeSDavid Howells conn->state = RXRPC_CONN_LOCALLY_ABORTED; 214f5c17aaeSDavid Howells spin_unlock_bh(&conn->state_lock); 215f5c17aaeSDavid Howells 21685f32278SDavid Howells msg.msg_name = &conn->params.peer->srx.transport; 21785f32278SDavid Howells msg.msg_namelen = conn->params.peer->srx.transport_len; 2188c3e34a4SDavid Howells msg.msg_control = NULL; 2198c3e34a4SDavid Howells msg.msg_controllen = 0; 2208c3e34a4SDavid Howells msg.msg_flags = 0; 2218c3e34a4SDavid Howells 22219ffa01cSDavid Howells whdr.epoch = htonl(conn->proto.epoch); 22319ffa01cSDavid Howells whdr.cid = htonl(conn->proto.cid); 2248c3e34a4SDavid Howells whdr.callNumber = 0; 2258c3e34a4SDavid Howells whdr.seq = 0; 2268c3e34a4SDavid Howells whdr.type = RXRPC_PACKET_TYPE_ABORT; 2278c3e34a4SDavid Howells whdr.flags = conn->out_clientflag; 2288c3e34a4SDavid Howells whdr.userStatus = 0; 2298c3e34a4SDavid Howells whdr.securityIndex = conn->security_ix; 2308c3e34a4SDavid Howells whdr._rsvd = 0; 23168d6d1aeSDavid Howells whdr.serviceId = htons(conn->service_id); 2328c3e34a4SDavid Howells 23364753092SDavid Howells word = htonl(conn->abort_code); 2348c3e34a4SDavid Howells 2358c3e34a4SDavid Howells iov[0].iov_base = &whdr; 2368c3e34a4SDavid Howells iov[0].iov_len = sizeof(whdr); 2378c3e34a4SDavid Howells iov[1].iov_base = &word; 2388c3e34a4SDavid Howells iov[1].iov_len = sizeof(word); 2398c3e34a4SDavid Howells 2408c3e34a4SDavid Howells len = iov[0].iov_len + iov[1].iov_len; 2418c3e34a4SDavid Howells 2428c3e34a4SDavid Howells serial = atomic_inc_return(&conn->serial); 24339ce6755SDavid Howells rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, serial); 2448c3e34a4SDavid Howells whdr.serial = htonl(serial); 24564753092SDavid Howells _proto("Tx CONN ABORT %%%u { %d }", serial, conn->abort_code); 2468c3e34a4SDavid Howells 24785f32278SDavid Howells ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len); 2488c3e34a4SDavid Howells if (ret < 0) { 2496b47fe1dSDavid Howells trace_rxrpc_tx_fail(conn->debug_id, serial, ret, 2504764c0daSDavid Howells rxrpc_tx_point_conn_abort); 2518c3e34a4SDavid Howells _debug("sendmsg failed: %d", ret); 2528c3e34a4SDavid Howells return -EAGAIN; 2538c3e34a4SDavid Howells } 2548c3e34a4SDavid Howells 2554764c0daSDavid Howells trace_rxrpc_tx_packet(conn->debug_id, &whdr, rxrpc_tx_point_conn_abort); 2564764c0daSDavid Howells 257330bdcfaSDavid Howells conn->params.peer->last_tx_at = ktime_get_seconds(); 258ace45becSDavid Howells 2598c3e34a4SDavid Howells _leave(" = 0"); 2608c3e34a4SDavid Howells return 0; 2618c3e34a4SDavid Howells } 2628c3e34a4SDavid Howells 2638c3e34a4SDavid Howells /* 2648c3e34a4SDavid Howells * mark a call as being on a now-secured channel 265248f219cSDavid Howells * - must be called with BH's disabled. 2668c3e34a4SDavid Howells */ 2678c3e34a4SDavid Howells static void rxrpc_call_is_secure(struct rxrpc_call *call) 2688c3e34a4SDavid Howells { 2698c3e34a4SDavid Howells _enter("%p", call); 2708c3e34a4SDavid Howells if (call) { 271248f219cSDavid Howells write_lock_bh(&call->state_lock); 272248f219cSDavid Howells if (call->state == RXRPC_CALL_SERVER_SECURING) { 273248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_ACCEPTING; 274248f219cSDavid Howells rxrpc_notify_socket(call); 275248f219cSDavid Howells } 276248f219cSDavid Howells write_unlock_bh(&call->state_lock); 2778c3e34a4SDavid Howells } 2788c3e34a4SDavid Howells } 2798c3e34a4SDavid Howells 2808c3e34a4SDavid Howells /* 2818c3e34a4SDavid Howells * connection-level Rx packet processor 2828c3e34a4SDavid Howells */ 2838c3e34a4SDavid Howells static int rxrpc_process_event(struct rxrpc_connection *conn, 2848c3e34a4SDavid Howells struct sk_buff *skb, 2858c3e34a4SDavid Howells u32 *_abort_code) 2868c3e34a4SDavid Howells { 2878c3e34a4SDavid Howells struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 2888c3e34a4SDavid Howells __be32 wtmp; 2898c3e34a4SDavid Howells u32 abort_code; 2908c3e34a4SDavid Howells int loop, ret; 2918c3e34a4SDavid Howells 2928c3e34a4SDavid Howells if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { 293248f219cSDavid Howells _leave(" = -ECONNABORTED [%u]", conn->state); 2948c3e34a4SDavid Howells return -ECONNABORTED; 2958c3e34a4SDavid Howells } 2968c3e34a4SDavid Howells 2978c3e34a4SDavid Howells _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial); 2988c3e34a4SDavid Howells 2998c3e34a4SDavid Howells switch (sp->hdr.type) { 30018bfeba5SDavid Howells case RXRPC_PACKET_TYPE_DATA: 30118bfeba5SDavid Howells case RXRPC_PACKET_TYPE_ACK: 3023136ef49SDavid Howells rxrpc_conn_retransmit_call(conn, skb, 3033136ef49SDavid Howells sp->hdr.cid & RXRPC_CHANNELMASK); 30418bfeba5SDavid Howells return 0; 30518bfeba5SDavid Howells 3064d4a6ac7SDavid Howells case RXRPC_PACKET_TYPE_BUSY: 3074d4a6ac7SDavid Howells /* Just ignore BUSY packets for now. */ 3084d4a6ac7SDavid Howells return 0; 3094d4a6ac7SDavid Howells 3108c3e34a4SDavid Howells case RXRPC_PACKET_TYPE_ABORT: 311775e5b71SDavid Howells if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header), 312fb46f6eeSDavid Howells &wtmp, sizeof(wtmp)) < 0) { 313fb46f6eeSDavid Howells trace_rxrpc_rx_eproto(NULL, sp->hdr.serial, 314fb46f6eeSDavid Howells tracepoint_string("bad_abort")); 3158c3e34a4SDavid Howells return -EPROTO; 316fb46f6eeSDavid Howells } 3178c3e34a4SDavid Howells abort_code = ntohl(wtmp); 3188c3e34a4SDavid Howells _proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code); 3198c3e34a4SDavid Howells 32064753092SDavid Howells conn->error = -ECONNABORTED; 32164753092SDavid Howells conn->abort_code = abort_code; 3228c3e34a4SDavid Howells conn->state = RXRPC_CONN_REMOTELY_ABORTED; 32339ce6755SDavid Howells rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED, sp->hdr.serial); 3248c3e34a4SDavid Howells return -ECONNABORTED; 3258c3e34a4SDavid Howells 3268c3e34a4SDavid Howells case RXRPC_PACKET_TYPE_CHALLENGE: 3278c3e34a4SDavid Howells return conn->security->respond_to_challenge(conn, skb, 3288c3e34a4SDavid Howells _abort_code); 3298c3e34a4SDavid Howells 3308c3e34a4SDavid Howells case RXRPC_PACKET_TYPE_RESPONSE: 3318c3e34a4SDavid Howells ret = conn->security->verify_response(conn, skb, _abort_code); 3328c3e34a4SDavid Howells if (ret < 0) 3338c3e34a4SDavid Howells return ret; 3348c3e34a4SDavid Howells 3358c3e34a4SDavid Howells ret = conn->security->init_connection_security(conn); 3368c3e34a4SDavid Howells if (ret < 0) 3378c3e34a4SDavid Howells return ret; 3388c3e34a4SDavid Howells 339a263629dSHerbert Xu ret = conn->security->prime_packet_security(conn); 340a263629dSHerbert Xu if (ret < 0) 341a263629dSHerbert Xu return ret; 342a263629dSHerbert Xu 343a1399f8bSDavid Howells spin_lock(&conn->channel_lock); 3448c3e34a4SDavid Howells spin_lock(&conn->state_lock); 3458c3e34a4SDavid Howells 346bba304dbSDavid Howells if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) { 347bba304dbSDavid Howells conn->state = RXRPC_CONN_SERVICE; 348248f219cSDavid Howells spin_unlock(&conn->state_lock); 3498c3e34a4SDavid Howells for (loop = 0; loop < RXRPC_MAXCALLS; loop++) 350dee46364SDavid Howells rxrpc_call_is_secure( 351dee46364SDavid Howells rcu_dereference_protected( 352a1399f8bSDavid Howells conn->channels[loop].call, 353a1399f8bSDavid Howells lockdep_is_held(&conn->channel_lock))); 354248f219cSDavid Howells } else { 355248f219cSDavid Howells spin_unlock(&conn->state_lock); 3568c3e34a4SDavid Howells } 3578c3e34a4SDavid Howells 358a1399f8bSDavid Howells spin_unlock(&conn->channel_lock); 3598c3e34a4SDavid Howells return 0; 3608c3e34a4SDavid Howells 3618c3e34a4SDavid Howells default: 362fb46f6eeSDavid Howells trace_rxrpc_rx_eproto(NULL, sp->hdr.serial, 363fb46f6eeSDavid Howells tracepoint_string("bad_conn_pkt")); 3648c3e34a4SDavid Howells return -EPROTO; 3658c3e34a4SDavid Howells } 3668c3e34a4SDavid Howells } 3678c3e34a4SDavid Howells 3688c3e34a4SDavid Howells /* 3698c3e34a4SDavid Howells * set up security and issue a challenge 3708c3e34a4SDavid Howells */ 3718c3e34a4SDavid Howells static void rxrpc_secure_connection(struct rxrpc_connection *conn) 3728c3e34a4SDavid Howells { 3738c3e34a4SDavid Howells u32 abort_code; 3748c3e34a4SDavid Howells int ret; 3758c3e34a4SDavid Howells 3768c3e34a4SDavid Howells _enter("{%d}", conn->debug_id); 3778c3e34a4SDavid Howells 3788c3e34a4SDavid Howells ASSERT(conn->security_ix != 0); 379063c60d3SDavid Howells ASSERT(conn->server_key); 3808c3e34a4SDavid Howells 3818c3e34a4SDavid Howells if (conn->security->issue_challenge(conn) < 0) { 3828c3e34a4SDavid Howells abort_code = RX_CALL_DEAD; 3838c3e34a4SDavid Howells ret = -ENOMEM; 3848c3e34a4SDavid Howells goto abort; 3858c3e34a4SDavid Howells } 3868c3e34a4SDavid Howells 3878c3e34a4SDavid Howells _leave(""); 3888c3e34a4SDavid Howells return; 3898c3e34a4SDavid Howells 3908c3e34a4SDavid Howells abort: 3918c3e34a4SDavid Howells _debug("abort %d, %d", ret, abort_code); 3923a92789aSDavid Howells rxrpc_abort_connection(conn, ret, abort_code); 3938c3e34a4SDavid Howells _leave(" [aborted]"); 3948c3e34a4SDavid Howells } 3958c3e34a4SDavid Howells 3968c3e34a4SDavid Howells /* 3973136ef49SDavid Howells * Process delayed final ACKs that we haven't subsumed into a subsequent call. 3983136ef49SDavid Howells */ 3993136ef49SDavid Howells static void rxrpc_process_delayed_final_acks(struct rxrpc_connection *conn) 4003136ef49SDavid Howells { 4013136ef49SDavid Howells unsigned long j = jiffies, next_j; 4023136ef49SDavid Howells unsigned int channel; 4033136ef49SDavid Howells bool set; 4043136ef49SDavid Howells 4053136ef49SDavid Howells again: 4063136ef49SDavid Howells next_j = j + LONG_MAX; 4073136ef49SDavid Howells set = false; 4083136ef49SDavid Howells for (channel = 0; channel < RXRPC_MAXCALLS; channel++) { 4093136ef49SDavid Howells struct rxrpc_channel *chan = &conn->channels[channel]; 4103136ef49SDavid Howells unsigned long ack_at; 4113136ef49SDavid Howells 4123136ef49SDavid Howells if (!test_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags)) 4133136ef49SDavid Howells continue; 4143136ef49SDavid Howells 4153136ef49SDavid Howells smp_rmb(); /* vs rxrpc_disconnect_client_call */ 4163136ef49SDavid Howells ack_at = READ_ONCE(chan->final_ack_at); 4173136ef49SDavid Howells 4183136ef49SDavid Howells if (time_before(j, ack_at)) { 4193136ef49SDavid Howells if (time_before(ack_at, next_j)) { 4203136ef49SDavid Howells next_j = ack_at; 4213136ef49SDavid Howells set = true; 4223136ef49SDavid Howells } 4233136ef49SDavid Howells continue; 4243136ef49SDavid Howells } 4253136ef49SDavid Howells 4263136ef49SDavid Howells if (test_and_clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel, 4273136ef49SDavid Howells &conn->flags)) 4283136ef49SDavid Howells rxrpc_conn_retransmit_call(conn, NULL, channel); 4293136ef49SDavid Howells } 4303136ef49SDavid Howells 4313136ef49SDavid Howells j = jiffies; 4323136ef49SDavid Howells if (time_before_eq(next_j, j)) 4333136ef49SDavid Howells goto again; 4343136ef49SDavid Howells if (set) 4353136ef49SDavid Howells rxrpc_reduce_conn_timer(conn, next_j); 4363136ef49SDavid Howells } 4373136ef49SDavid Howells 4383136ef49SDavid Howells /* 4398c3e34a4SDavid Howells * connection-level event processor 4408c3e34a4SDavid Howells */ 44104d36d74SDavid Howells static void rxrpc_do_process_connection(struct rxrpc_connection *conn) 4428c3e34a4SDavid Howells { 4438c3e34a4SDavid Howells struct sk_buff *skb; 4448c3e34a4SDavid Howells u32 abort_code = RX_PROTOCOL_ERROR; 4458c3e34a4SDavid Howells int ret; 4468c3e34a4SDavid Howells 4472c4579e4SDavid Howells if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events)) 4488c3e34a4SDavid Howells rxrpc_secure_connection(conn); 4498c3e34a4SDavid Howells 4503136ef49SDavid Howells /* Process delayed ACKs whose time has come. */ 4513136ef49SDavid Howells if (conn->flags & RXRPC_CONN_FINAL_ACK_MASK) 4523136ef49SDavid Howells rxrpc_process_delayed_final_acks(conn); 4533136ef49SDavid Howells 4548c3e34a4SDavid Howells /* go through the conn-level event packets, releasing the ref on this 4558c3e34a4SDavid Howells * connection that each one has when we've finished with it */ 4568c3e34a4SDavid Howells while ((skb = skb_dequeue(&conn->rx_queue))) { 457987db9f7SDavid Howells rxrpc_see_skb(skb, rxrpc_skb_seen); 4588c3e34a4SDavid Howells ret = rxrpc_process_event(conn, skb, &abort_code); 4598c3e34a4SDavid Howells switch (ret) { 4608c3e34a4SDavid Howells case -EPROTO: 4618c3e34a4SDavid Howells case -EKEYEXPIRED: 4628c3e34a4SDavid Howells case -EKEYREJECTED: 4638c3e34a4SDavid Howells goto protocol_error; 4648c2f826dSDavid Howells case -ENOMEM: 4658c3e34a4SDavid Howells case -EAGAIN: 4668c3e34a4SDavid Howells goto requeue_and_leave; 4678c3e34a4SDavid Howells case -ECONNABORTED: 4688c3e34a4SDavid Howells default: 469987db9f7SDavid Howells rxrpc_free_skb(skb, rxrpc_skb_freed); 4708c3e34a4SDavid Howells break; 4718c3e34a4SDavid Howells } 4728c3e34a4SDavid Howells } 4738c3e34a4SDavid Howells 4748c3e34a4SDavid Howells return; 4758c3e34a4SDavid Howells 4768c3e34a4SDavid Howells requeue_and_leave: 4778c3e34a4SDavid Howells skb_queue_head(&conn->rx_queue, skb); 47804d36d74SDavid Howells return; 4798c3e34a4SDavid Howells 4808c3e34a4SDavid Howells protocol_error: 4813a92789aSDavid Howells if (rxrpc_abort_connection(conn, ret, abort_code) < 0) 4828c3e34a4SDavid Howells goto requeue_and_leave; 483987db9f7SDavid Howells rxrpc_free_skb(skb, rxrpc_skb_freed); 48404d36d74SDavid Howells return; 48504d36d74SDavid Howells } 48604d36d74SDavid Howells 48704d36d74SDavid Howells void rxrpc_process_connection(struct work_struct *work) 48804d36d74SDavid Howells { 48904d36d74SDavid Howells struct rxrpc_connection *conn = 49004d36d74SDavid Howells container_of(work, struct rxrpc_connection, processor); 49104d36d74SDavid Howells 49204d36d74SDavid Howells rxrpc_see_connection(conn); 49304d36d74SDavid Howells 49404d36d74SDavid Howells if (__rxrpc_use_local(conn->params.local)) { 49504d36d74SDavid Howells rxrpc_do_process_connection(conn); 49604d36d74SDavid Howells rxrpc_unuse_local(conn->params.local); 49704d36d74SDavid Howells } 49804d36d74SDavid Howells 49904d36d74SDavid Howells rxrpc_put_connection(conn); 50004d36d74SDavid Howells _leave(""); 50104d36d74SDavid Howells return; 5028c3e34a4SDavid Howells } 503