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From 0ccd2dbb3eca44a892a183db8c2e4221488ecf51 Mon Sep 17 00:00:00 2001
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Message-Id: <0ccd2dbb3eca44a892a183db8c2e4221488ecf51.1628790091.git.aclaudi@redhat.com>
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In-Reply-To: <650694eb0120722499207078f965442ef7343bb1.1628790091.git.aclaudi@redhat.com>
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References: <650694eb0120722499207078f965442ef7343bb1.1628790091.git.aclaudi@redhat.com>
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From: Andrea Claudi <aclaudi@redhat.com>
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Date: Mon, 9 Aug 2021 15:18:11 +0200
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Subject: [PATCH] mptcp: add support for port based endpoint
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1984733
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Upstream Status: iproute2.git commit 42fbca91
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commit 42fbca91cd616ae714c3f6aa2d4e2c3399498e38
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Author: Paolo Abeni <pabeni@redhat.com>
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Date: Fri Feb 19 21:42:55 2021 +0100
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mptcp: add support for port based endpoint
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The feature is supported by the kernel since 5.11-net-next,
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let's allow user-space to use it.
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Just parse and dump an additional, per endpoint, u16 attribute
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Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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Signed-off-by: David Ahern <dsahern@kernel.org>
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Signed-off-by: Andrea Claudi <aclaudi@redhat.com>
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---
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ip/ipmptcp.c | 16 ++++++++++++++--
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man/man8/ip-mptcp.8 | 8 ++++++++
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2 files changed, 22 insertions(+), 2 deletions(-)
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diff --git a/ip/ipmptcp.c b/ip/ipmptcp.c
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index e1ffafb3..5f659b59 100644
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--- a/ip/ipmptcp.c
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+++ b/ip/ipmptcp.c
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@@ -17,7 +17,7 @@ static void usage(void)
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{
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fprintf(stderr,
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"Usage: ip mptcp endpoint add ADDRESS [ dev NAME ] [ id ID ]\n"
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- " [ FLAG-LIST ]\n"
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+ " [ port NR ] [ FLAG-LIST ]\n"
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" ip mptcp endpoint delete id ID\n"
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" ip mptcp endpoint show [ id ID ]\n"
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" ip mptcp endpoint flush\n"
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@@ -97,6 +97,7 @@ static int mptcp_parse_opt(int argc, char **argv, struct nlmsghdr *n,
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bool id_set = false;
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__u32 index = 0;
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__u32 flags = 0;
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+ __u16 port = 0;
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__u8 id = 0;
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ll_init_map(&rth);
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@@ -123,6 +124,10 @@ static int mptcp_parse_opt(int argc, char **argv, struct nlmsghdr *n,
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if (!index)
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invarg("device does not exist\n", ifname);
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+ } else if (matches(*argv, "port") == 0) {
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+ NEXT_ARG();
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+ if (get_u16(&port, *argv, 0))
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+ invarg("expected port", *argv);
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} else if (get_addr(&address, *argv, AF_UNSPEC) == 0) {
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addr_set = true;
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} else {
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@@ -145,6 +150,8 @@ static int mptcp_parse_opt(int argc, char **argv, struct nlmsghdr *n,
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addattr32(n, MPTCP_BUFLEN, MPTCP_PM_ADDR_ATTR_FLAGS, flags);
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if (index)
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addattr32(n, MPTCP_BUFLEN, MPTCP_PM_ADDR_ATTR_IF_IDX, index);
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+ if (port)
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+ addattr16(n, MPTCP_BUFLEN, MPTCP_PM_ADDR_ATTR_PORT, port);
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if (addr_set) {
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int type;
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@@ -181,8 +188,8 @@ static int print_mptcp_addrinfo(struct rtattr *addrinfo)
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__u8 family = AF_UNSPEC, addr_attr_type;
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const char *ifname;
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unsigned int flags;
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+ __u16 id, port;
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int index;
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- __u16 id;
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parse_rtattr_nested(tb, MPTCP_PM_ADDR_ATTR_MAX, addrinfo);
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@@ -196,6 +203,11 @@ static int print_mptcp_addrinfo(struct rtattr *addrinfo)
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print_string(PRINT_ANY, "address", "%s ",
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format_host_rta(family, tb[addr_attr_type]));
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}
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+ if (tb[MPTCP_PM_ADDR_ATTR_PORT]) {
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+ port = rta_getattr_u16(tb[MPTCP_PM_ADDR_ATTR_PORT]);
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+ if (port)
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+ print_uint(PRINT_ANY, "port", "port %u ", port);
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+ }
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if (tb[MPTCP_PM_ADDR_ATTR_ID]) {
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id = rta_getattr_u8(tb[MPTCP_PM_ADDR_ATTR_ID]);
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print_uint(PRINT_ANY, "id", "id %u ", id);
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diff --git a/man/man8/ip-mptcp.8 b/man/man8/ip-mptcp.8
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index ef8409ea..98cb93b9 100644
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--- a/man/man8/ip-mptcp.8
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+++ b/man/man8/ip-mptcp.8
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@@ -20,6 +20,8 @@ ip-mptcp \- MPTCP path manager configuration
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.ti -8
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.BR "ip mptcp endpoint add "
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.IR IFADDR
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+.RB "[ " port
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+.IR PORT " ]"
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.RB "[ " dev
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.IR IFNAME " ]"
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.RB "[ " id
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@@ -87,6 +89,12 @@ ip mptcp endpoint flush flush all existing MPTCP endpoints
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.TE
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.TP
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+.IR PORT
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+When a port number is specified, incoming MPTCP subflows for already
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+established MPTCP sockets will be accepted on the specified port, regardless
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+the original listener port accepting the first MPTCP subflow and/or
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+this peer being actually on the client side.
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+
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.IR ID
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is a unique numeric identifier for the given endpoint
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--
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2.31.1
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