From: Mat Martineau Date: Tue, 17 May 2022 18:02:12 +0000 (-0700) Subject: mptcp: Do TCP fallback on early DSS checksum failure X-Git-Tag: v5.15.73~4122 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d12cd0bf5d262887eeaa407744618255bde76565;p=platform%2Fkernel%2Flinux-rpi.git mptcp: Do TCP fallback on early DSS checksum failure commit ae66fb2ba6c3dcaf8b9612b65aa949a1a4bed150 upstream. RFC 8684 section 3.7 describes several opportunities for a MPTCP connection to "fall back" to regular TCP early in the connection process, before it has been confirmed that MPTCP options can be successfully propagated on all SYN, SYN/ACK, and data packets. If a peer acknowledges the first received data packet with a regular TCP header (no MPTCP options), fallback is allowed. If the recipient of that first data packet finds a MPTCP DSS checksum error, this provides an opportunity to fail gracefully with a TCP fallback rather than resetting the connection (as might happen if a checksum failure were detected later). This commit modifies the checksum failure code to attempt fallback on the initial subflow of a MPTCP connection, only if it's a failure in the first data mapping. In cases where the peer initiates the connection, requests checksums, is the first to send data, and the peer is sending incorrect checksums (see https://github.com/multipath-tcp/mptcp_net-next/issues/275), this allows the connection to proceed as TCP rather than reset. Fixes: dd8bcd1768ff ("mptcp: validate the data checksum") Acked-by: Paolo Abeni Signed-off-by: Mat Martineau Signed-off-by: David S. Miller [mathew.j.martineau: backport: Resolved bitfield conflict in protocol.h] Signed-off-by: Mat Martineau Signed-off-by: Greg Kroah-Hartman --- diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 72a259a..e193b71 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -436,7 +436,8 @@ struct mptcp_subflow_context { rx_eof : 1, can_ack : 1, /* only after processing the remote a key */ disposable : 1, /* ctx can be free at ulp release time */ - stale : 1; /* unable to snd/rcv data, do not use for xmit */ + stale : 1, /* unable to snd/rcv data, do not use for xmit */ + valid_csum_seen : 1; /* at least one csum validated */ enum mptcp_data_avail data_avail; u32 remote_nonce; u64 thmac; diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c index 9c7deff..5ef9013 100644 --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -913,11 +913,14 @@ static enum mapping_status validate_data_csum(struct sock *ssk, struct sk_buff * subflow->map_data_csum); if (unlikely(csum)) { MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_DATACSUMERR); - subflow->send_mp_fail = 1; - MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_MPFAILTX); + if (subflow->mp_join || subflow->valid_csum_seen) { + subflow->send_mp_fail = 1; + MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_MPFAILTX); + } return subflow->mp_join ? MAPPING_INVALID : MAPPING_DUMMY; } + subflow->valid_csum_seen = 1; return MAPPING_OK; } @@ -1099,6 +1102,18 @@ static void subflow_sched_work_if_closed(struct mptcp_sock *msk, struct sock *ss } } +static bool subflow_can_fallback(struct mptcp_subflow_context *subflow) +{ + struct mptcp_sock *msk = mptcp_sk(subflow->conn); + + if (subflow->mp_join) + return false; + else if (READ_ONCE(msk->csum_enabled)) + return !subflow->valid_csum_seen; + else + return !subflow->fully_established; +} + static bool subflow_check_data_avail(struct sock *ssk) { struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); @@ -1176,7 +1191,7 @@ fallback: return true; } - if (subflow->mp_join || subflow->fully_established) { + if (!subflow_can_fallback(subflow)) { /* fatal protocol error, close the socket. * subflow_error_report() will introduce the appropriate barriers */