diff options
Diffstat (limited to 'net/rxrpc/conn_event.c')
-rw-r--r-- | net/rxrpc/conn_event.c | 271 |
1 files changed, 150 insertions, 121 deletions
diff --git a/net/rxrpc/conn_event.c b/net/rxrpc/conn_event.c index cee0f35..3f9d8d7 100644 --- a/net/rxrpc/conn_event.c +++ b/net/rxrpc/conn_event.c @@ -15,20 +15,128 @@ #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 <net/sock.h> #include <net/af_rxrpc.h> #include <net/ip.h> #include "ar-internal.h" /* + * Retransmit terminal ACK or ABORT of the previous call. + */ +static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, + struct sk_buff *skb) +{ + struct rxrpc_skb_priv *sp = rxrpc_skb(skb); + struct rxrpc_channel *chan; + struct msghdr msg; + struct kvec iov; + struct { + struct rxrpc_wire_header whdr; + union { + struct { + __be32 code; + } abort; + struct { + struct rxrpc_ackpacket ack; + u8 padding[3]; + struct rxrpc_ackinfo info; + }; + }; + } __attribute__((packed)) pkt; + size_t len; + u32 serial, mtu, call_id; + + _enter("%d", conn->debug_id); + + chan = &conn->channels[sp->hdr.cid & RXRPC_CHANNELMASK]; + + /* If the last call got moved on whilst we were waiting to run, just + * ignore this packet. + */ + call_id = READ_ONCE(chan->last_call); + /* Sync with __rxrpc_disconnect_call() */ + smp_rmb(); + if (call_id != sp->hdr.callNumber) + return; + + msg.msg_name = &conn->params.peer->srx.transport; + msg.msg_namelen = conn->params.peer->srx.transport_len; + msg.msg_control = NULL; + msg.msg_controllen = 0; + msg.msg_flags = 0; + + pkt.whdr.epoch = htonl(sp->hdr.epoch); + pkt.whdr.cid = htonl(sp->hdr.cid); + pkt.whdr.callNumber = htonl(sp->hdr.callNumber); + pkt.whdr.seq = 0; + pkt.whdr.type = chan->last_type; + pkt.whdr.flags = conn->out_clientflag; + pkt.whdr.userStatus = 0; + pkt.whdr.securityIndex = conn->security_ix; + pkt.whdr._rsvd = 0; + pkt.whdr.serviceId = htons(chan->last_service_id); + + len = sizeof(pkt.whdr); + switch (chan->last_type) { + case RXRPC_PACKET_TYPE_ABORT: + pkt.abort.code = htonl(chan->last_abort); + len += sizeof(pkt.abort); + break; + + case RXRPC_PACKET_TYPE_ACK: + mtu = conn->params.peer->if_mtu; + mtu -= conn->params.peer->hdrsize; + pkt.ack.bufferSpace = 0; + pkt.ack.maxSkew = htons(skb->priority); + pkt.ack.firstPacket = htonl(chan->last_seq); + pkt.ack.previousPacket = htonl(chan->last_seq - 1); + pkt.ack.serial = htonl(sp->hdr.serial); + pkt.ack.reason = RXRPC_ACK_DUPLICATE; + pkt.ack.nAcks = 0; + pkt.info.rxMTU = htonl(rxrpc_rx_mtu); + pkt.info.maxMTU = htonl(mtu); + pkt.info.rwind = htonl(rxrpc_rx_window_size); + pkt.info.jumbo_max = htonl(rxrpc_rx_jumbo_max); + pkt.whdr.flags |= RXRPC_SLOW_START_OK; + len += sizeof(pkt.ack) + sizeof(pkt.info); + break; + } + + /* Resync with __rxrpc_disconnect_call() and check that the last call + * didn't get advanced whilst we were filling out the packets. + */ + smp_rmb(); + if (READ_ONCE(chan->last_call) != call_id) + return; + + iov.iov_base = &pkt; + iov.iov_len = len; + + serial = atomic_inc_return(&conn->serial); + pkt.whdr.serial = htonl(serial); + + switch (chan->last_type) { + case RXRPC_PACKET_TYPE_ABORT: + _proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort); + break; + case RXRPC_PACKET_TYPE_ACK: + trace_rxrpc_tx_ack(NULL, serial, chan->last_seq, 0, + RXRPC_ACK_DUPLICATE, 0); + _proto("Tx ACK %%%u [re]", serial); + break; + } + + kernel_sendmsg(conn->params.local->socket, &msg, &iov, 1, len); + _leave(""); + return; +} + +/* * pass a connection-level abort onto all calls on that connection */ -static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state, - u32 abort_code) +static void rxrpc_abort_calls(struct rxrpc_connection *conn, + enum rxrpc_call_completion compl, + u32 abort_code, int error) { struct rxrpc_call *call; int i; @@ -41,19 +149,15 @@ static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state, call = rcu_dereference_protected( conn->channels[i].call, lockdep_is_held(&conn->channel_lock)); - write_lock_bh(&call->state_lock); - if (call->state <= RXRPC_CALL_COMPLETE) { - call->state = state; - if (state == RXRPC_CALL_LOCALLY_ABORTED) { - call->local_abort = conn->local_abort; - set_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events); - } else { - call->remote_abort = conn->remote_abort; - set_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); - } - rxrpc_queue_call(call); + if (call) { + if (compl == RXRPC_CALL_LOCALLY_ABORTED) + trace_rxrpc_abort("CON", call->cid, + call->call_id, 0, + abort_code, error); + if (rxrpc_set_call_completion(call, compl, + abort_code, error)) + rxrpc_notify_socket(call); } - write_unlock_bh(&call->state_lock); } spin_unlock(&conn->channel_lock); @@ -78,17 +182,16 @@ static int rxrpc_abort_connection(struct rxrpc_connection *conn, /* generate a connection-level abort */ spin_lock_bh(&conn->state_lock); - if (conn->state < RXRPC_CONN_REMOTELY_ABORTED) { - conn->state = RXRPC_CONN_LOCALLY_ABORTED; - conn->error = error; - spin_unlock_bh(&conn->state_lock); - } else { + if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { spin_unlock_bh(&conn->state_lock); _leave(" = 0 [already dead]"); return 0; } - rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code); + conn->state = RXRPC_CONN_LOCALLY_ABORTED; + spin_unlock_bh(&conn->state_lock); + + rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error); msg.msg_name = &conn->params.peer->srx.transport; msg.msg_namelen = conn->params.peer->srx.transport_len; @@ -132,17 +235,18 @@ static int rxrpc_abort_connection(struct rxrpc_connection *conn, /* * mark a call as being on a now-secured channel - * - must be called with softirqs disabled + * - must be called with BH's disabled. */ static void rxrpc_call_is_secure(struct rxrpc_call *call) { _enter("%p", call); if (call) { - read_lock(&call->state_lock); - if (call->state < RXRPC_CALL_COMPLETE && - !test_and_set_bit(RXRPC_CALL_EV_SECURED, &call->events)) - rxrpc_queue_call(call); - read_unlock(&call->state_lock); + write_lock_bh(&call->state_lock); + if (call->state == RXRPC_CALL_SERVER_SECURING) { + call->state = RXRPC_CALL_SERVER_ACCEPTING; + rxrpc_notify_socket(call); + } + write_unlock_bh(&call->state_lock); } } @@ -159,22 +263,28 @@ static int rxrpc_process_event(struct rxrpc_connection *conn, int loop, ret; if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { - kleave(" = -ECONNABORTED [%u]", conn->state); + _leave(" = -ECONNABORTED [%u]", conn->state); return -ECONNABORTED; } _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial); switch (sp->hdr.type) { + case RXRPC_PACKET_TYPE_DATA: + case RXRPC_PACKET_TYPE_ACK: + rxrpc_conn_retransmit_call(conn, skb); + return 0; + case RXRPC_PACKET_TYPE_ABORT: - if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0) + if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header), + &wtmp, sizeof(wtmp)) < 0) return -EPROTO; abort_code = ntohl(wtmp); _proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code); conn->state = RXRPC_CONN_REMOTELY_ABORTED; rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED, - abort_code); + abort_code, ECONNABORTED); return -ECONNABORTED; case RXRPC_PACKET_TYPE_CHALLENGE: @@ -199,14 +309,16 @@ static int rxrpc_process_event(struct rxrpc_connection *conn, if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) { conn->state = RXRPC_CONN_SERVICE; + spin_unlock(&conn->state_lock); for (loop = 0; loop < RXRPC_MAXCALLS; loop++) rxrpc_call_is_secure( rcu_dereference_protected( conn->channels[loop].call, lockdep_is_held(&conn->channel_lock))); + } else { + spin_unlock(&conn->state_lock); } - spin_unlock(&conn->state_lock); spin_unlock(&conn->channel_lock); return 0; @@ -269,7 +381,7 @@ void rxrpc_process_connection(struct work_struct *work) u32 abort_code = RX_PROTOCOL_ERROR; int ret; - _enter("{%d}", conn->debug_id); + rxrpc_see_connection(conn); if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events)) rxrpc_secure_connection(conn); @@ -277,6 +389,7 @@ void rxrpc_process_connection(struct work_struct *work) /* go through the conn-level event packets, releasing the ref on this * connection that each one has when we've finished with it */ while ((skb = skb_dequeue(&conn->rx_queue))) { + rxrpc_see_skb(skb, rxrpc_skb_rx_seen); ret = rxrpc_process_event(conn, skb, &abort_code); switch (ret) { case -EPROTO: @@ -287,7 +400,7 @@ void rxrpc_process_connection(struct work_struct *work) goto requeue_and_leave; case -ECONNABORTED: default: - rxrpc_free_skb(skb); + rxrpc_free_skb(skb, rxrpc_skb_rx_freed); break; } } @@ -304,91 +417,7 @@ requeue_and_leave: protocol_error: if (rxrpc_abort_connection(conn, -ret, abort_code) < 0) goto requeue_and_leave; - rxrpc_free_skb(skb); + rxrpc_free_skb(skb, rxrpc_skb_rx_freed); _leave(" [EPROTO]"); goto out; } - -/* - * put a packet up for transport-level abort - */ -void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb) -{ - CHECK_SLAB_OKAY(&local->usage); - - skb_queue_tail(&local->reject_queue, skb); - rxrpc_queue_local(local); -} - -/* - * reject packets through the local endpoint - */ -void rxrpc_reject_packets(struct rxrpc_local *local) -{ - union { - struct sockaddr sa; - struct sockaddr_in sin; - } sa; - struct rxrpc_skb_priv *sp; - struct rxrpc_wire_header whdr; - struct sk_buff *skb; - struct msghdr msg; - struct kvec iov[2]; - size_t size; - __be32 code; - - _enter("%d", local->debug_id); - - iov[0].iov_base = &whdr; - iov[0].iov_len = sizeof(whdr); - iov[1].iov_base = &code; - iov[1].iov_len = sizeof(code); - size = sizeof(whdr) + sizeof(code); - - msg.msg_name = &sa; - msg.msg_control = NULL; - msg.msg_controllen = 0; - msg.msg_flags = 0; - - memset(&sa, 0, sizeof(sa)); - sa.sa.sa_family = local->srx.transport.family; - switch (sa.sa.sa_family) { - case AF_INET: - msg.msg_namelen = sizeof(sa.sin); - break; - default: - msg.msg_namelen = 0; - break; - } - - memset(&whdr, 0, sizeof(whdr)); - whdr.type = RXRPC_PACKET_TYPE_ABORT; - - while ((skb = skb_dequeue(&local->reject_queue))) { - sp = rxrpc_skb(skb); - switch (sa.sa.sa_family) { - case AF_INET: - sa.sin.sin_port = udp_hdr(skb)->source; - sa.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; - code = htonl(skb->priority); - - whdr.epoch = htonl(sp->hdr.epoch); - whdr.cid = htonl(sp->hdr.cid); - whdr.callNumber = htonl(sp->hdr.callNumber); - whdr.serviceId = htons(sp->hdr.serviceId); - whdr.flags = sp->hdr.flags; - whdr.flags ^= RXRPC_CLIENT_INITIATED; - whdr.flags &= RXRPC_CLIENT_INITIATED; - - kernel_sendmsg(local->socket, &msg, iov, 2, size); - break; - - default: - break; - } - - rxrpc_free_skb(skb); - } - - _leave(""); -} |