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https://github.com/morgan9e/systemd
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3f69070598
Multipath TCP (MPTCP), standardized in RFC8684 [1], is a TCP extension that enables a TCP connection to use different paths. It allows a device to make use of multiple interfaces at once to send and receive TCP packets over a single MPTCP connection. MPTCP can aggregate the bandwidth of multiple interfaces or prefer the one with the lowest latency, it also allows a fail-over if one path is down, and the traffic is seamlessly re-injected on other paths. To 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 [2]. To use it on Linux, an application must explicitly enable it when creating the socket: int sd = socket(AF_INET(6), SOCK_STREAM, IPPROTO_MPTCP); No need to change anything else in the application. This patch allows MPTCP protocol in the Socket unit configuration. So now, a <unit>.socket can contain this to use MPTCP instead of TCP: [Socket] SocketProtocol=mptcp MPTCP support has been allowed similarly to what has been already done to allow SCTP: just one line in core/socket.c, a very simple addition thanks to the flexible architecture already in place. On top of that, IPPROTO_MPTCP has also been added in the list of allowed protocols in two other places, and in the doc. It has also been added to the missing_network.h file, for systems with an old libc -- note that it was also required to include <netinet/in.h> in this file to avoid redefinition errors. Link: https://www.rfc-editor.org/rfc/rfc8684.html [1] Link: https://www.mptcp.dev [2]
91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <netinet/in.h>
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/* linux/in6.h or netinet/in.h */
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#ifndef IPV6_UNICAST_IF
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#define IPV6_UNICAST_IF 76
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#endif
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/* linux/in6.h or netinet/in.h */
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#ifndef IPV6_TRANSPARENT
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#define IPV6_TRANSPARENT 75
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#endif
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/* linux/in.h or netinet/in.h */
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#ifndef IPPROTO_MPTCP
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#define IPPROTO_MPTCP 262
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#endif
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/* Not exposed but defined at include/net/ip.h */
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#ifndef IPV4_MIN_MTU
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#define IPV4_MIN_MTU 68
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#endif
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/* linux/ipv6.h */
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#ifndef IPV6_MIN_MTU
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#define IPV6_MIN_MTU 1280
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#endif
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/* Note that LOOPBACK_IFINDEX is currently not exposed by the
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* kernel/glibc, but hardcoded internally by the kernel. However, as
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* it is exported to userspace indirectly via rtnetlink and the
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* ioctls, and made use of widely we define it here too, in a way that
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* is compatible with the kernel's internal definition. */
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#ifndef LOOPBACK_IFINDEX
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#define LOOPBACK_IFINDEX 1
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#endif
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/* Not exposed yet. Similar values are defined in net/ethernet.h */
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#ifndef ETHERTYPE_LLDP
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#define ETHERTYPE_LLDP 0x88cc
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#endif
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/* Not exposed but defined in linux/netdevice.h */
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#ifndef MAX_PHYS_ITEM_ID_LEN
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#define MAX_PHYS_ITEM_ID_LEN 32
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#endif
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/* Not exposed but defined in include/net/bonding.h */
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#ifndef BOND_MAX_ARP_TARGETS
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#define BOND_MAX_ARP_TARGETS 16
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#endif
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/* Not exposed but defined in include/linux/ieee80211.h */
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#ifndef IEEE80211_MAX_SSID_LEN
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#define IEEE80211_MAX_SSID_LEN 32
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#endif
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/* Not exposed but defined in include/net/netlabel.h */
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#ifndef NETLBL_NLTYPE_UNLABELED_NAME
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#define NETLBL_NLTYPE_UNLABELED_NAME "NLBL_UNLBL"
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#endif
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/* Not exposed but defined in net/netlabel/netlabel_unlabeled.h */
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enum {
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NLBL_UNLABEL_C_UNSPEC,
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NLBL_UNLABEL_C_ACCEPT,
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NLBL_UNLABEL_C_LIST,
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NLBL_UNLABEL_C_STATICADD,
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NLBL_UNLABEL_C_STATICREMOVE,
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NLBL_UNLABEL_C_STATICLIST,
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NLBL_UNLABEL_C_STATICADDDEF,
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NLBL_UNLABEL_C_STATICREMOVEDEF,
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NLBL_UNLABEL_C_STATICLISTDEF,
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__NLBL_UNLABEL_C_MAX,
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};
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/* Not exposed but defined in net/netlabel/netlabel_unlabeled.h */
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enum {
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NLBL_UNLABEL_A_UNSPEC,
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NLBL_UNLABEL_A_ACPTFLG,
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NLBL_UNLABEL_A_IPV6ADDR,
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NLBL_UNLABEL_A_IPV6MASK,
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NLBL_UNLABEL_A_IPV4ADDR,
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NLBL_UNLABEL_A_IPV4MASK,
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NLBL_UNLABEL_A_IFACE,
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NLBL_UNLABEL_A_SECCTX,
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__NLBL_UNLABEL_A_MAX,
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};
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