From b3b313667f768d48bdf36d1eb4f8c406f21dd8f5 Mon Sep 17 00:00:00 2001 From: Paolo Abeni Date: Tue, 14 Dec 2021 17:58:52 +0100 Subject: [PATCH] mptcp: clean-up MPJ option writing Check for all MPJ variant at once, this reduces the number of conditionals traversed on average and will simplify the next patch. No functional change intended. Reviewed-by: Mat Martineau Signed-off-by: Paolo Abeni --- net/mptcp/options.c | 44 +++++++++++++++++++++++--------------------- 1 file changed, 23 insertions(+), 21 deletions(-) diff --git a/net/mptcp/options.c b/net/mptcp/options.c index 8a1020e4285c7..7a6a39b716331 100644 --- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -1381,27 +1381,29 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp, /* MPC is additionally mutually exclusive with MP_PRIO */ goto mp_capable_done; - } else if (OPTION_MPTCP_MPJ_SYN & opts->suboptions) { - *ptr++ = mptcp_option(MPTCPOPT_MP_JOIN, - TCPOLEN_MPTCP_MPJ_SYN, - opts->backup, opts->join_id); - put_unaligned_be32(opts->token, ptr); - ptr += 1; - put_unaligned_be32(opts->nonce, ptr); - ptr += 1; - } else if (OPTION_MPTCP_MPJ_SYNACK & opts->suboptions) { - *ptr++ = mptcp_option(MPTCPOPT_MP_JOIN, - TCPOLEN_MPTCP_MPJ_SYNACK, - opts->backup, opts->join_id); - put_unaligned_be64(opts->thmac, ptr); - ptr += 2; - put_unaligned_be32(opts->nonce, ptr); - ptr += 1; - } else if (OPTION_MPTCP_MPJ_ACK & opts->suboptions) { - *ptr++ = mptcp_option(MPTCPOPT_MP_JOIN, - TCPOLEN_MPTCP_MPJ_ACK, 0, 0); - memcpy(ptr, opts->hmac, MPTCPOPT_HMAC_LEN); - ptr += 5; + } else if (OPTIONS_MPTCP_MPJ & opts->suboptions) { + if (OPTION_MPTCP_MPJ_SYN & opts->suboptions) { + *ptr++ = mptcp_option(MPTCPOPT_MP_JOIN, + TCPOLEN_MPTCP_MPJ_SYN, + opts->backup, opts->join_id); + put_unaligned_be32(opts->token, ptr); + ptr += 1; + put_unaligned_be32(opts->nonce, ptr); + ptr += 1; + } else if (OPTION_MPTCP_MPJ_SYNACK & opts->suboptions) { + *ptr++ = mptcp_option(MPTCPOPT_MP_JOIN, + TCPOLEN_MPTCP_MPJ_SYNACK, + opts->backup, opts->join_id); + put_unaligned_be64(opts->thmac, ptr); + ptr += 2; + put_unaligned_be32(opts->nonce, ptr); + ptr += 1; + } else { + *ptr++ = mptcp_option(MPTCPOPT_MP_JOIN, + TCPOLEN_MPTCP_MPJ_ACK, 0, 0); + memcpy(ptr, opts->hmac, MPTCPOPT_HMAC_LEN); + ptr += 5; + } } else if (OPTION_MPTCP_ADD_ADDR & opts->suboptions) { u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; u8 echo = MPTCP_ADDR_ECHO;