From: Matthieu Baerts (NGI0) Date: Mon, 3 Aug 2026 16:16:34 +0000 (+0200) Subject: mptcp: avoid combining some incoming suboptions X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=b6ee361524641f57b2e2363f7737f20e17f67827;p=thirdparty%2Fkernel%2Flinux.git mptcp: avoid combining some incoming suboptions Some MPTCP suboptions are mutually exclusive according to the RFC8684, but also because in different places, the code doesn't expect some combinations to be present. That's specially true for suboptions that would be present twice, but with different attributes. The new restrictions are the same as the ones applied on the output side, with mptcp_write_options. The same rules can be reused with a small fix: an MP_FASTCLOSE can be used with a DSS when the sender picks this option [1], which is not the case on Linux. Here are the rules: Which options can be used together? X: mutually exclusive O: often used together C: can be used together in some cases P: could be used together but we prefer not to (optimisations) | Opt: | MPC | MPJ | DSS | ADD | RM | PRIO | FAIL | FC | |------|------|------|------|------|------|------|------|------| | MPC |------|------|------|------|------|------|------|------| | MPJ | X |------|------|------|------|------|------|------| | DSS | X | X |------|------|------|------|------|------| | ADD | X | X | P |------|------|------|------|------| | RM | C | C | C | P |------|------|------|------| | PRIO | X | C | C | C | C |------|------|------| | FAIL | X | X | C | X | X | X |------|------| | FC | X | X | P | X | X | X | X |------| | RST | X | X | X | X | X | X | O | O | |------|------|------|------|------|------|------|------|------| The only difference is with the 'P': another stack could send and ADD_ADDR with other suboptions (DSS, RM_ADDR), and this should be allowed. A few points of attention: - In theory, an MP_CAPABLE could be used with a RM_ADDR, but there is no reason to add it with a SYN. Note that even with a 4th ACK, it doesn't seem to be useful, except when IDs are known in advance via another channel. Better not to break that. - Now, combining both an MP_CAPABLE and an MP_JOIN will no longer result to a reject of the two options, but only the second suboption is ignored. That seems OK to do that for this unexpected error. At least now all inconsistent combinations are handled the same way. This could change later in next. This also means the explicit checks for having both MPC + MPJ in subflow.c will now be unreachable. That's fine, they will be removed in a follow-up patch. - In case of conflicting combinations, the extra suboption(s) is/are ignored: having such combinations either means the remote peer is buggy, or is evil. The simplest action is then taken in this case: stop processing the current suboption. - In mp_opt->suboptions, there is also a bit reserved to the checksum, which can be used in an MP_CAPABLE and a DSS. Each time a DSS option can be used in parallel with another option, the checksum can be set, so the verification is combined into a new OPTIONS_MPTCP_DSS macro. - An MP_CAPABLE ACK can carry a Data-Level Length, and an optional Checksum: they are the same as the ones found in a DSS, because a DSS cannot be used in parallel to an MP_CAPABLE. Similarly, even if there is room, a DSS cannot be used with an MP_JOIN. Fixes: eda7acddf808 ("mptcp: Handle MPTCP TCP options") Cc: stable@vger.kernel.org Link: https://www.rfc-editor.org/rfc/rfc8684.html#section-3.5-5.1 [1] Signed-off-by: Matthieu Baerts (NGI0) Link: https://patch.msgid.link/20260803-net-mptcp-misc-fixes-7-2-rc6-v2-2-b8f496d71664@kernel.org Signed-off-by: Jakub Kicinski --- diff --git a/net/mptcp/options.c b/net/mptcp/options.c index 038eca33c6b1..1057d500577b 100644 --- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -50,6 +50,14 @@ static void mptcp_parse_option(const struct sk_buff *skb, } } + /* Only the MPC + ACK can be used with a RM_ADDR */ + if (subopt == OPTION_MPTCP_MPC_ACK) { + if ((mp_opt->suboptions & ~OPTION_MPTCP_RM_ADDR) != 0) + break; + } else if (mp_opt->suboptions != 0) { + break; + } + /* Cfr RFC 8684 Section 3.3.0: * If a checksum is present but its use had * not been negotiated in the MP_CAPABLE handshake, the receiver MUST @@ -122,6 +130,11 @@ static void mptcp_parse_option(const struct sk_buff *skb, break; case MPTCPOPT_MP_JOIN: + /* Can be used with a restricted number of other options */ + if ((mp_opt->suboptions & ~(OPTION_MPTCP_RM_ADDR | + OPTION_MPTCP_PRIO)) != 0) + break; + if (opsize == TCPOLEN_MPTCP_MPJ_SYN) { mp_opt->suboptions |= OPTION_MPTCP_MPJ_SYN; mp_opt->backup = *ptr++ & MPTCPOPT_BACKUP; @@ -153,6 +166,14 @@ static void mptcp_parse_option(const struct sk_buff *skb, break; case MPTCPOPT_DSS: + /* Can be used with a restricted number of other options */ + if ((mp_opt->suboptions & ~(OPTION_MPTCP_ADD_ADDR | + OPTION_MPTCP_RM_ADDR | + OPTION_MPTCP_PRIO | + OPTION_MPTCP_FASTCLOSE | + OPTION_MPTCP_FAIL)) != 0) + break; + pr_debug("DSS\n"); ptr++; @@ -240,6 +261,12 @@ static void mptcp_parse_option(const struct sk_buff *skb, break; case MPTCPOPT_ADD_ADDR: + /* Can be used with a restricted number of other options */ + if ((mp_opt->suboptions & ~(OPTIONS_MPTCP_DSS | + OPTION_MPTCP_RM_ADDR | + OPTION_MPTCP_PRIO)) != 0) + break; + mp_opt->echo = (*ptr++) & MPTCP_ADDR_ECHO; if (!mp_opt->echo) { if (opsize == TCPOLEN_MPTCP_ADD_ADDR || @@ -299,6 +326,14 @@ static void mptcp_parse_option(const struct sk_buff *skb, break; case MPTCPOPT_RM_ADDR: + /* Can be used with a restricted number of other options */ + if ((mp_opt->suboptions & ~(OPTION_MPTCP_MPC_ACK | + OPTIONS_MPTCP_MPJ | + OPTIONS_MPTCP_DSS | + OPTION_MPTCP_ADD_ADDR | + OPTION_MPTCP_PRIO)) != 0) + break; + if (opsize < TCPOLEN_MPTCP_RM_ADDR_BASE + 1 || opsize > TCPOLEN_MPTCP_RM_ADDR_BASE + MPTCP_RM_IDS_MAX) break; @@ -313,6 +348,13 @@ static void mptcp_parse_option(const struct sk_buff *skb, break; case MPTCPOPT_MP_PRIO: + /* Can be used with a restricted number of other options */ + if ((mp_opt->suboptions & ~(OPTIONS_MPTCP_MPJ | + OPTIONS_MPTCP_DSS | + OPTION_MPTCP_ADD_ADDR | + OPTION_MPTCP_RM_ADDR)) != 0) + break; + if (opsize != TCPOLEN_MPTCP_PRIO) break; @@ -322,6 +364,11 @@ static void mptcp_parse_option(const struct sk_buff *skb, break; case MPTCPOPT_MP_FASTCLOSE: + /* Can be used with a restricted number of other options */ + if ((mp_opt->suboptions & ~(OPTIONS_MPTCP_DSS | + OPTION_MPTCP_RST)) != 0) + break; + if (opsize != TCPOLEN_MPTCP_FASTCLOSE) break; @@ -333,6 +380,11 @@ static void mptcp_parse_option(const struct sk_buff *skb, break; case MPTCPOPT_RST: + /* Can be used with a restricted number of other options */ + if ((mp_opt->suboptions & ~(OPTION_MPTCP_FAIL | + OPTION_MPTCP_FASTCLOSE)) != 0) + break; + if (opsize != TCPOLEN_MPTCP_RST) break; @@ -348,6 +400,11 @@ static void mptcp_parse_option(const struct sk_buff *skb, break; case MPTCPOPT_MP_FAIL: + /* Can be used with a restricted number of other options */ + if ((mp_opt->suboptions & ~(OPTIONS_MPTCP_DSS | + OPTION_MPTCP_RST)) != 0) + break; + if (opsize != TCPOLEN_MPTCP_FAIL) break; @@ -1406,7 +1463,7 @@ void mptcp_write_options(struct tcphdr *th, __be32 *ptr, struct tcp_sock *tp, * RM | C | C | C | P |------|------|------|------| * PRIO | X | C | C | C | C |------|------|------| * FAIL | X | X | C | X | X | X |------|------| - * FC | X | X | X | X | X | X | X |------| + * FC | X | X | P | X | X | X | X |------| * RST | X | X | X | X | X | X | O | O | * ------|------|------|------|------|------|------|------|------| * diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 4a2d40cd7b13..c13680d18994 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -37,6 +37,7 @@ OPTION_MPTCP_MPC_ACK) #define OPTIONS_MPTCP_MPJ (OPTION_MPTCP_MPJ_SYN | OPTION_MPTCP_MPJ_SYNACK | \ OPTION_MPTCP_MPJ_ACK) +#define OPTIONS_MPTCP_DSS (OPTION_MPTCP_DSS | OPTION_MPTCP_CSUMREQD) /* MPTCP option subtypes */ #define MPTCPOPT_MP_CAPABLE 0