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Core: added socket protocol

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Multipath TCP (MPTCP), standardized in RFC8684 [1], is a TCP extension
that enables a TCP connection to use different paths.

Multipath TCP has been used for several use cases. On smartphones, MPTCP
enables seamless handovers between cellular and Wi-Fi networks while
preserving Established connections. This use-case is what pushed Apple
to use MPTCP since 2013 in multiple applications [2]. On dual-stack
hosts, Multipath TCP enables the TCP connection to automatically use the
best performing path, either IPv4 or IPv6. If one path fails, MPTCP
automatically uses the other path.

The benefit from MPTCP, both the client and the server have to support
it. Multipath TCP is a backward-compatible TCP extension that is enabled
by default on recent Linux distributions (Debian, Ubuntu, Redhat, ...).
Multipath TCP is included in the Linux kernel since version 5.6 [3].
To use it on Linux, an application must explicitly enable it when
creating the socket. No need to change anything else in the application.

Even if MPTCP is supported by different OS, only Linux supports the
`IPPROTO_MPTCP` protocol, which is why this feature is currently
limited to Linux only.

This patch updates the creation of listening sockets to use a new field
of the `ngx_listening_s` structure. The `protocol` field can be used in
conjunction with the `type` to specify the protocol to be used.

Modules will then be able to specify a different protocol, e.g.
IPPROTO_MPTCP.

Co-authored-by: Maxime Dourov <mux99@live.be>

Link: https://www.rfc-editor.org/rfc/rfc8684.html [1]
Link: https://www.tessares.net/apples-mptcp-story-so-far/ [2]
Link: https://www.mptcp.dev [3]
This commit is contained in:
Aperence 2024-09-06 20:27:36 +02:00
parent 00637cce36
commit e058a9fe53
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2 changed files with 3 additions and 1 deletions
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3
src/core/ngx_connection.c
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@ -487,7 +487,8 @@ ngx_open_listening_sockets(ngx_cycle_t *cycle)
continue;
}
s = ngx_socket(ls[i].sockaddr->sa_family, ls[i].type, 0);
s = ngx_socket(ls[i].sockaddr->sa_family, ls[i].type,
+ ls[i].protocol);
if (s == (ngx_socket_t) -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,

1
src/core/ngx_connection.h
View File

@ -24,6 +24,7 @@ struct ngx_listening_s {
ngx_str_t addr_text;
int type;
int protocol;
int backlog;
int rcvbuf;