From 5fc62f6a139a7b06b027bf442cd4205619506f59 Mon Sep 17 00:00:00 2001 From: David Howells Date: Wed, 29 Nov 2017 14:40:41 +0000 Subject: rxrpc: Fix ACK generation from the connection event processor Repeat terminal ACKs and now terminal ACKs are now generated from the connection event processor rather from call handling as this allows us to discard client call structures as soon as possible and free up the channel for a follow on call. However, in ACKs so generated, the additional information trailer is malformed because the padding that's meant to be in the middle isn't included in what's transmitted. Fix it so that the 3 bytes of padding are included in the transmission. Further, the trailer is misaligned because of the padding, so assigment to the u16 and u32 fields inside it might cause problems on some arches, so fix this by breaking the padding and the trailer out of the packed struct. (This also deals with potential compiler weirdies where some of the nested structs are packed and some aren't). The symptoms can be seen in wireshark as terminal DUPLICATE or IDLE ACK packets in which the Max MTU, Interface MTU and rwind fields have weird values and the Max Packets field is apparently missing. Reported-by: Jeffrey Altman Signed-off-by: David Howells --- net/rxrpc/conn_event.c | 50 +++++++++++++++++++++++++++++--------------------- 1 file changed, 29 insertions(+), 21 deletions(-) (limited to 'net/rxrpc') diff --git a/net/rxrpc/conn_event.c b/net/rxrpc/conn_event.c index 9e9a8db..4ca11be 100644 --- a/net/rxrpc/conn_event.c +++ b/net/rxrpc/conn_event.c @@ -30,22 +30,18 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct rxrpc_skb_priv *sp = skb ? rxrpc_skb(skb) : NULL; struct rxrpc_channel *chan; struct msghdr msg; - struct kvec iov; + struct kvec iov[3]; struct { struct rxrpc_wire_header whdr; union { - struct { - __be32 code; - } abort; - struct { - struct rxrpc_ackpacket ack; - u8 padding[3]; - struct rxrpc_ackinfo info; - }; + __be32 abort_code; + struct rxrpc_ackpacket ack; }; } __attribute__((packed)) pkt; + struct rxrpc_ackinfo ack_info; size_t len; - u32 serial, mtu, call_id; + int ioc; + u32 serial, mtu, call_id, padding; _enter("%d", conn->debug_id); @@ -66,6 +62,13 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, msg.msg_controllen = 0; msg.msg_flags = 0; + iov[0].iov_base = &pkt; + iov[0].iov_len = sizeof(pkt.whdr); + iov[1].iov_base = &padding; + iov[1].iov_len = 3; + iov[2].iov_base = &ack_info; + iov[2].iov_len = sizeof(ack_info); + pkt.whdr.epoch = htonl(conn->proto.epoch); pkt.whdr.cid = htonl(conn->proto.cid); pkt.whdr.callNumber = htonl(call_id); @@ -80,8 +83,10 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, len = sizeof(pkt.whdr); switch (chan->last_type) { case RXRPC_PACKET_TYPE_ABORT: - pkt.abort.code = htonl(chan->last_abort); - len += sizeof(pkt.abort); + pkt.abort_code = htonl(chan->last_abort); + iov[0].iov_len += sizeof(pkt.abort_code); + len += sizeof(pkt.abort_code); + ioc = 1; break; case RXRPC_PACKET_TYPE_ACK: @@ -94,13 +99,19 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, pkt.ack.serial = htonl(skb ? sp->hdr.serial : 0); pkt.ack.reason = skb ? RXRPC_ACK_DUPLICATE : RXRPC_ACK_IDLE; 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); + ack_info.rxMTU = htonl(rxrpc_rx_mtu); + ack_info.maxMTU = htonl(mtu); + ack_info.rwind = htonl(rxrpc_rx_window_size); + ack_info.jumbo_max = htonl(rxrpc_rx_jumbo_max); pkt.whdr.flags |= RXRPC_SLOW_START_OK; - len += sizeof(pkt.ack) + sizeof(pkt.info); + padding = 0; + iov[0].iov_len += sizeof(pkt.ack); + len += sizeof(pkt.ack) + 3 + sizeof(ack_info); + ioc = 3; break; + + default: + return; } /* Resync with __rxrpc_disconnect_call() and check that the last call @@ -110,9 +121,6 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, 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); @@ -127,7 +135,7 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, break; } - kernel_sendmsg(conn->params.local->socket, &msg, &iov, 1, len); + kernel_sendmsg(conn->params.local->socket, &msg, iov, ioc, len); _leave(""); return; } -- cgit v1.1