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- /* RxRPC packet reception
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/module.h>
- #include <linux/net.h>
- #include <linux/skbuff.h>
- #include <linux/errqueue.h>
- #include <linux/udp.h>
- #include <linux/in.h>
- #include <linux/in6.h>
- #include <linux/icmp.h>
- #include <linux/gfp.h>
- #include <net/sock.h>
- #include <net/af_rxrpc.h>
- #include <net/ip.h>
- #include <net/udp.h>
- #include <net/net_namespace.h>
- #include "ar-internal.h"
- /*
- * queue a packet for recvmsg to pass to userspace
- * - the caller must hold a lock on call->lock
- * - must not be called with interrupts disabled (sk_filter() disables BH's)
- * - eats the packet whether successful or not
- * - there must be just one reference to the packet, which the caller passes to
- * this function
- */
- int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb,
- bool force, bool terminal)
- {
- struct rxrpc_skb_priv *sp;
- struct rxrpc_sock *rx = call->socket;
- struct sock *sk;
- int ret;
- _enter(",,%d,%d", force, terminal);
- ASSERT(!irqs_disabled());
- sp = rxrpc_skb(skb);
- ASSERTCMP(sp->call, ==, call);
- /* if we've already posted the terminal message for a call, then we
- * don't post any more */
- if (test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) {
- _debug("already terminated");
- ASSERTCMP(call->state, >=, RXRPC_CALL_COMPLETE);
- rxrpc_free_skb(skb);
- return 0;
- }
- sk = &rx->sk;
- if (!force) {
- /* cast skb->rcvbuf to unsigned... It's pointless, but
- * reduces number of warnings when compiling with -W
- * --ANK */
- // ret = -ENOBUFS;
- // if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
- // (unsigned int) sk->sk_rcvbuf)
- // goto out;
- ret = sk_filter(sk, skb);
- if (ret < 0)
- goto out;
- }
- spin_lock_bh(&sk->sk_receive_queue.lock);
- if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags) &&
- !test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
- call->socket->sk.sk_state != RXRPC_CLOSE) {
- skb->destructor = rxrpc_packet_destructor;
- skb->dev = NULL;
- skb->sk = sk;
- atomic_add(skb->truesize, &sk->sk_rmem_alloc);
- if (terminal) {
- _debug("<<<< TERMINAL MESSAGE >>>>");
- set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags);
- }
- /* allow interception by a kernel service */
- if (rx->interceptor) {
- rx->interceptor(sk, call->user_call_ID, skb);
- spin_unlock_bh(&sk->sk_receive_queue.lock);
- } else {
- _net("post skb %p", skb);
- __skb_queue_tail(&sk->sk_receive_queue, skb);
- spin_unlock_bh(&sk->sk_receive_queue.lock);
- if (!sock_flag(sk, SOCK_DEAD))
- sk->sk_data_ready(sk);
- }
- skb = NULL;
- } else {
- spin_unlock_bh(&sk->sk_receive_queue.lock);
- }
- ret = 0;
- out:
- rxrpc_free_skb(skb);
- _leave(" = %d", ret);
- return ret;
- }
- /*
- * process a DATA packet, posting the packet to the appropriate queue
- * - eats the packet if successful
- */
- static int rxrpc_fast_process_data(struct rxrpc_call *call,
- struct sk_buff *skb, u32 seq)
- {
- struct rxrpc_skb_priv *sp;
- bool terminal;
- int ret, ackbit, ack;
- u32 serial;
- u8 flags;
- _enter("{%u,%u},,{%u}", call->rx_data_post, call->rx_first_oos, seq);
- sp = rxrpc_skb(skb);
- ASSERTCMP(sp->call, ==, NULL);
- flags = sp->hdr.flags;
- serial = sp->hdr.serial;
- spin_lock(&call->lock);
- if (call->state > RXRPC_CALL_COMPLETE)
- goto discard;
- ASSERTCMP(call->rx_data_expect, >=, call->rx_data_post);
- ASSERTCMP(call->rx_data_post, >=, call->rx_data_recv);
- ASSERTCMP(call->rx_data_recv, >=, call->rx_data_eaten);
- if (seq < call->rx_data_post) {
- _debug("dup #%u [-%u]", seq, call->rx_data_post);
- ack = RXRPC_ACK_DUPLICATE;
- ret = -ENOBUFS;
- goto discard_and_ack;
- }
- /* we may already have the packet in the out of sequence queue */
- ackbit = seq - (call->rx_data_eaten + 1);
- ASSERTCMP(ackbit, >=, 0);
- if (__test_and_set_bit(ackbit, call->ackr_window)) {
- _debug("dup oos #%u [%u,%u]",
- seq, call->rx_data_eaten, call->rx_data_post);
- ack = RXRPC_ACK_DUPLICATE;
- goto discard_and_ack;
- }
- if (seq >= call->ackr_win_top) {
- _debug("exceed #%u [%u]", seq, call->ackr_win_top);
- __clear_bit(ackbit, call->ackr_window);
- ack = RXRPC_ACK_EXCEEDS_WINDOW;
- goto discard_and_ack;
- }
- if (seq == call->rx_data_expect) {
- clear_bit(RXRPC_CALL_EXPECT_OOS, &call->flags);
- call->rx_data_expect++;
- } else if (seq > call->rx_data_expect) {
- _debug("oos #%u [%u]", seq, call->rx_data_expect);
- call->rx_data_expect = seq + 1;
- if (test_and_set_bit(RXRPC_CALL_EXPECT_OOS, &call->flags)) {
- ack = RXRPC_ACK_OUT_OF_SEQUENCE;
- goto enqueue_and_ack;
- }
- goto enqueue_packet;
- }
- if (seq != call->rx_data_post) {
- _debug("ahead #%u [%u]", seq, call->rx_data_post);
- goto enqueue_packet;
- }
- if (test_bit(RXRPC_CALL_RCVD_LAST, &call->flags))
- goto protocol_error;
- /* if the packet need security things doing to it, then it goes down
- * the slow path */
- if (call->conn->security_ix)
- goto enqueue_packet;
- sp->call = call;
- rxrpc_get_call(call);
- atomic_inc(&call->skb_count);
- terminal = ((flags & RXRPC_LAST_PACKET) &&
- !(flags & RXRPC_CLIENT_INITIATED));
- ret = rxrpc_queue_rcv_skb(call, skb, false, terminal);
- if (ret < 0) {
- if (ret == -ENOMEM || ret == -ENOBUFS) {
- __clear_bit(ackbit, call->ackr_window);
- ack = RXRPC_ACK_NOSPACE;
- goto discard_and_ack;
- }
- goto out;
- }
- skb = NULL;
- sp = NULL;
- _debug("post #%u", seq);
- ASSERTCMP(call->rx_data_post, ==, seq);
- call->rx_data_post++;
- if (flags & RXRPC_LAST_PACKET)
- set_bit(RXRPC_CALL_RCVD_LAST, &call->flags);
- /* if we've reached an out of sequence packet then we need to drain
- * that queue into the socket Rx queue now */
- if (call->rx_data_post == call->rx_first_oos) {
- _debug("drain rx oos now");
- read_lock(&call->state_lock);
- if (call->state < RXRPC_CALL_COMPLETE &&
- !test_and_set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events))
- rxrpc_queue_call(call);
- read_unlock(&call->state_lock);
- }
- spin_unlock(&call->lock);
- atomic_inc(&call->ackr_not_idle);
- rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, serial, false);
- _leave(" = 0 [posted]");
- return 0;
- protocol_error:
- ret = -EBADMSG;
- out:
- spin_unlock(&call->lock);
- _leave(" = %d", ret);
- return ret;
- discard_and_ack:
- _debug("discard and ACK packet %p", skb);
- __rxrpc_propose_ACK(call, ack, serial, true);
- discard:
- spin_unlock(&call->lock);
- rxrpc_free_skb(skb);
- _leave(" = 0 [discarded]");
- return 0;
- enqueue_and_ack:
- __rxrpc_propose_ACK(call, ack, serial, true);
- enqueue_packet:
- _net("defer skb %p", skb);
- spin_unlock(&call->lock);
- skb_queue_tail(&call->rx_queue, skb);
- atomic_inc(&call->ackr_not_idle);
- read_lock(&call->state_lock);
- if (call->state < RXRPC_CALL_DEAD)
- rxrpc_queue_call(call);
- read_unlock(&call->state_lock);
- _leave(" = 0 [queued]");
- return 0;
- }
- /*
- * assume an implicit ACKALL of the transmission phase of a client socket upon
- * reception of the first reply packet
- */
- static void rxrpc_assume_implicit_ackall(struct rxrpc_call *call, u32 serial)
- {
- write_lock_bh(&call->state_lock);
- switch (call->state) {
- case RXRPC_CALL_CLIENT_AWAIT_REPLY:
- call->state = RXRPC_CALL_CLIENT_RECV_REPLY;
- call->acks_latest = serial;
- _debug("implicit ACKALL %%%u", call->acks_latest);
- set_bit(RXRPC_CALL_EV_RCVD_ACKALL, &call->events);
- write_unlock_bh(&call->state_lock);
- if (try_to_del_timer_sync(&call->resend_timer) >= 0) {
- clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events);
- clear_bit(RXRPC_CALL_EV_RESEND, &call->events);
- clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
- }
- break;
- default:
- write_unlock_bh(&call->state_lock);
- break;
- }
- }
- /*
- * post an incoming packet to the nominated call to deal with
- * - must get rid of the sk_buff, either by freeing it or by queuing it
- */
- void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb)
- {
- struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
- __be32 wtmp;
- u32 hi_serial, abort_code;
- _enter("%p,%p", call, skb);
- ASSERT(!irqs_disabled());
- #if 0 // INJECT RX ERROR
- if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
- static int skip = 0;
- if (++skip == 3) {
- printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n");
- skip = 0;
- goto free_packet;
- }
- }
- #endif
- /* track the latest serial number on this connection for ACK packet
- * information */
- hi_serial = atomic_read(&call->conn->hi_serial);
- while (sp->hdr.serial > hi_serial)
- hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial,
- sp->hdr.serial);
- /* request ACK generation for any ACK or DATA packet that requests
- * it */
- if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
- _proto("ACK Requested on %%%u", sp->hdr.serial);
- rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial, false);
- }
- switch (sp->hdr.type) {
- case RXRPC_PACKET_TYPE_ABORT:
- _debug("abort");
- if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0)
- goto protocol_error;
- abort_code = ntohl(wtmp);
- _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code);
- write_lock_bh(&call->state_lock);
- if (call->state < RXRPC_CALL_COMPLETE) {
- call->state = RXRPC_CALL_REMOTELY_ABORTED;
- call->remote_abort = abort_code;
- set_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events);
- rxrpc_queue_call(call);
- }
- goto free_packet_unlock;
- case RXRPC_PACKET_TYPE_BUSY:
- _proto("Rx BUSY %%%u", sp->hdr.serial);
- if (rxrpc_conn_is_service(call->conn))
- goto protocol_error;
- write_lock_bh(&call->state_lock);
- switch (call->state) {
- case RXRPC_CALL_CLIENT_SEND_REQUEST:
- call->state = RXRPC_CALL_SERVER_BUSY;
- set_bit(RXRPC_CALL_EV_RCVD_BUSY, &call->events);
- rxrpc_queue_call(call);
- case RXRPC_CALL_SERVER_BUSY:
- goto free_packet_unlock;
- default:
- goto protocol_error_locked;
- }
- default:
- _proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], sp->hdr.serial);
- goto protocol_error;
- case RXRPC_PACKET_TYPE_DATA:
- _proto("Rx DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq);
- if (sp->hdr.seq == 0)
- goto protocol_error;
- call->ackr_prev_seq = sp->hdr.seq;
- /* received data implicitly ACKs all of the request packets we
- * sent when we're acting as a client */
- if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY)
- rxrpc_assume_implicit_ackall(call, sp->hdr.serial);
- switch (rxrpc_fast_process_data(call, skb, sp->hdr.seq)) {
- case 0:
- skb = NULL;
- goto done;
- default:
- BUG();
- /* data packet received beyond the last packet */
- case -EBADMSG:
- goto protocol_error;
- }
- case RXRPC_PACKET_TYPE_ACKALL:
- case RXRPC_PACKET_TYPE_ACK:
- /* ACK processing is done in process context */
- read_lock_bh(&call->state_lock);
- if (call->state < RXRPC_CALL_DEAD) {
- skb_queue_tail(&call->rx_queue, skb);
- rxrpc_queue_call(call);
- skb = NULL;
- }
- read_unlock_bh(&call->state_lock);
- goto free_packet;
- }
- protocol_error:
- _debug("protocol error");
- write_lock_bh(&call->state_lock);
- protocol_error_locked:
- if (call->state <= RXRPC_CALL_COMPLETE) {
- call->state = RXRPC_CALL_LOCALLY_ABORTED;
- call->local_abort = RX_PROTOCOL_ERROR;
- set_bit(RXRPC_CALL_EV_ABORT, &call->events);
- rxrpc_queue_call(call);
- }
- free_packet_unlock:
- write_unlock_bh(&call->state_lock);
- free_packet:
- rxrpc_free_skb(skb);
- done:
- _leave("");
- }
- /*
- * split up a jumbo data packet
- */
- static void rxrpc_process_jumbo_packet(struct rxrpc_call *call,
- struct sk_buff *jumbo)
- {
- struct rxrpc_jumbo_header jhdr;
- struct rxrpc_skb_priv *sp;
- struct sk_buff *part;
- _enter(",{%u,%u}", jumbo->data_len, jumbo->len);
- sp = rxrpc_skb(jumbo);
- do {
- sp->hdr.flags &= ~RXRPC_JUMBO_PACKET;
- /* make a clone to represent the first subpacket in what's left
- * of the jumbo packet */
- part = skb_clone(jumbo, GFP_ATOMIC);
- if (!part) {
- /* simply ditch the tail in the event of ENOMEM */
- pskb_trim(jumbo, RXRPC_JUMBO_DATALEN);
- break;
- }
- rxrpc_new_skb(part);
- pskb_trim(part, RXRPC_JUMBO_DATALEN);
- if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN))
- goto protocol_error;
- if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0)
- goto protocol_error;
- if (!pskb_pull(jumbo, sizeof(jhdr)))
- BUG();
- sp->hdr.seq += 1;
- sp->hdr.serial += 1;
- sp->hdr.flags = jhdr.flags;
- sp->hdr._rsvd = ntohs(jhdr._rsvd);
- _proto("Rx DATA Jumbo %%%u", sp->hdr.serial - 1);
- rxrpc_fast_process_packet(call, part);
- part = NULL;
- } while (sp->hdr.flags & RXRPC_JUMBO_PACKET);
- rxrpc_fast_process_packet(call, jumbo);
- _leave("");
- return;
- protocol_error:
- _debug("protocol error");
- rxrpc_free_skb(part);
- rxrpc_free_skb(jumbo);
- write_lock_bh(&call->state_lock);
- if (call->state <= RXRPC_CALL_COMPLETE) {
- call->state = RXRPC_CALL_LOCALLY_ABORTED;
- call->local_abort = RX_PROTOCOL_ERROR;
- set_bit(RXRPC_CALL_EV_ABORT, &call->events);
- rxrpc_queue_call(call);
- }
- write_unlock_bh(&call->state_lock);
- _leave("");
- }
- /*
- * post an incoming packet to the appropriate call/socket to deal with
- * - must get rid of the sk_buff, either by freeing it or by queuing it
- */
- static void rxrpc_post_packet_to_call(struct rxrpc_call *call,
- struct sk_buff *skb)
- {
- struct rxrpc_skb_priv *sp;
- _enter("%p,%p", call, skb);
- sp = rxrpc_skb(skb);
- _debug("extant call [%d]", call->state);
- read_lock(&call->state_lock);
- switch (call->state) {
- case RXRPC_CALL_LOCALLY_ABORTED:
- if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events)) {
- rxrpc_queue_call(call);
- goto free_unlock;
- }
- case RXRPC_CALL_REMOTELY_ABORTED:
- case RXRPC_CALL_NETWORK_ERROR:
- case RXRPC_CALL_DEAD:
- goto dead_call;
- case RXRPC_CALL_COMPLETE:
- case RXRPC_CALL_CLIENT_FINAL_ACK:
- /* complete server call */
- if (rxrpc_conn_is_service(call->conn))
- goto dead_call;
- /* resend last packet of a completed call */
- _debug("final ack again");
- rxrpc_get_call(call);
- set_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events);
- rxrpc_queue_call(call);
- goto free_unlock;
- default:
- break;
- }
- read_unlock(&call->state_lock);
- rxrpc_get_call(call);
- if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
- sp->hdr.flags & RXRPC_JUMBO_PACKET)
- rxrpc_process_jumbo_packet(call, skb);
- else
- rxrpc_fast_process_packet(call, skb);
- rxrpc_put_call(call);
- goto done;
- dead_call:
- if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) {
- skb->priority = RX_CALL_DEAD;
- rxrpc_reject_packet(call->conn->params.local, skb);
- goto unlock;
- }
- free_unlock:
- rxrpc_free_skb(skb);
- unlock:
- read_unlock(&call->state_lock);
- done:
- _leave("");
- }
- /*
- * post connection-level events to the connection
- * - this includes challenges, responses and some aborts
- */
- static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
- struct sk_buff *skb)
- {
- _enter("%p,%p", conn, skb);
- skb_queue_tail(&conn->rx_queue, skb);
- rxrpc_queue_conn(conn);
- }
- /*
- * post endpoint-level events to the local endpoint
- * - this includes debug and version messages
- */
- static void rxrpc_post_packet_to_local(struct rxrpc_local *local,
- struct sk_buff *skb)
- {
- _enter("%p,%p", local, skb);
- skb_queue_tail(&local->event_queue, skb);
- rxrpc_queue_local(local);
- }
- /*
- * Extract the wire header from a packet and translate the byte order.
- */
- static noinline
- int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb)
- {
- struct rxrpc_wire_header whdr;
- /* dig out the RxRPC connection details */
- if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0)
- return -EBADMSG;
- if (!pskb_pull(skb, sizeof(whdr)))
- BUG();
- memset(sp, 0, sizeof(*sp));
- sp->hdr.epoch = ntohl(whdr.epoch);
- sp->hdr.cid = ntohl(whdr.cid);
- sp->hdr.callNumber = ntohl(whdr.callNumber);
- sp->hdr.seq = ntohl(whdr.seq);
- sp->hdr.serial = ntohl(whdr.serial);
- sp->hdr.flags = whdr.flags;
- sp->hdr.type = whdr.type;
- sp->hdr.userStatus = whdr.userStatus;
- sp->hdr.securityIndex = whdr.securityIndex;
- sp->hdr._rsvd = ntohs(whdr._rsvd);
- sp->hdr.serviceId = ntohs(whdr.serviceId);
- return 0;
- }
- /*
- * handle data received on the local endpoint
- * - may be called in interrupt context
- *
- * The socket is locked by the caller and this prevents the socket from being
- * shut down and the local endpoint from going away, thus sk_user_data will not
- * be cleared until this function returns.
- */
- void rxrpc_data_ready(struct sock *sk)
- {
- struct rxrpc_connection *conn;
- struct rxrpc_skb_priv *sp;
- struct rxrpc_local *local = sk->sk_user_data;
- struct sk_buff *skb;
- int ret;
- _enter("%p", sk);
- ASSERT(!irqs_disabled());
- skb = skb_recv_datagram(sk, 0, 1, &ret);
- if (!skb) {
- if (ret == -EAGAIN)
- return;
- _debug("UDP socket error %d", ret);
- return;
- }
- rxrpc_new_skb(skb);
- _net("recv skb %p", skb);
- /* we'll probably need to checksum it (didn't call sock_recvmsg) */
- if (skb_checksum_complete(skb)) {
- rxrpc_free_skb(skb);
- __UDP_INC_STATS(&init_net, UDP_MIB_INERRORS, 0);
- _leave(" [CSUM failed]");
- return;
- }
- __UDP_INC_STATS(&init_net, UDP_MIB_INDATAGRAMS, 0);
- /* The socket buffer we have is owned by UDP, with UDP's data all over
- * it, but we really want our own data there.
- */
- skb_orphan(skb);
- sp = rxrpc_skb(skb);
- _net("Rx UDP packet from %08x:%04hu",
- ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source));
- /* dig out the RxRPC connection details */
- if (rxrpc_extract_header(sp, skb) < 0)
- goto bad_message;
- _net("Rx RxRPC %s ep=%x call=%x:%x",
- sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient",
- sp->hdr.epoch, sp->hdr.cid, sp->hdr.callNumber);
- if (sp->hdr.type >= RXRPC_N_PACKET_TYPES ||
- !((RXRPC_SUPPORTED_PACKET_TYPES >> sp->hdr.type) & 1)) {
- _proto("Rx Bad Packet Type %u", sp->hdr.type);
- goto bad_message;
- }
- if (sp->hdr.type == RXRPC_PACKET_TYPE_VERSION) {
- rxrpc_post_packet_to_local(local, skb);
- goto out;
- }
- if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
- (sp->hdr.callNumber == 0 || sp->hdr.seq == 0))
- goto bad_message;
- rcu_read_lock();
- conn = rxrpc_find_connection_rcu(local, skb);
- if (!conn)
- goto cant_route_call;
- if (sp->hdr.callNumber == 0) {
- /* Connection-level packet */
- _debug("CONN %p {%d}", conn, conn->debug_id);
- rxrpc_post_packet_to_conn(conn, skb);
- } else {
- /* Call-bound packets are routed by connection channel. */
- unsigned int channel = sp->hdr.cid & RXRPC_CHANNELMASK;
- struct rxrpc_channel *chan = &conn->channels[channel];
- struct rxrpc_call *call = rcu_dereference(chan->call);
- if (!call || atomic_read(&call->usage) == 0)
- goto cant_route_call;
- rxrpc_post_packet_to_call(call, skb);
- }
- rcu_read_unlock();
- out:
- return;
- cant_route_call:
- rcu_read_unlock();
- _debug("can't route call");
- if (sp->hdr.flags & RXRPC_CLIENT_INITIATED &&
- sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
- if (sp->hdr.seq == 1) {
- _debug("first packet");
- skb_queue_tail(&local->accept_queue, skb);
- rxrpc_queue_work(&local->processor);
- _leave(" [incoming]");
- return;
- }
- skb->priority = RX_INVALID_OPERATION;
- } else {
- skb->priority = RX_CALL_DEAD;
- }
- if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) {
- _debug("reject type %d",sp->hdr.type);
- rxrpc_reject_packet(local, skb);
- } else {
- rxrpc_free_skb(skb);
- }
- _leave(" [no call]");
- return;
- bad_message:
- skb->priority = RX_PROTOCOL_ERROR;
- rxrpc_reject_packet(local, skb);
- _leave(" [badmsg]");
- }
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