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mptcp: Add MPTCP socket stubs

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Implements the infrastructure for MPTCP sockets.

MPTCP sockets open one in-kernel TCP socket per subflow. These subflow
sockets are only managed by the MPTCP socket that owns them and are not
visible from userspace. This commit allows a userspace program to open
an MPTCP socket with:

  sock = socket(AF_INET, SOCK_STREAM, IPPROTO_MPTCP);

The resulting socket is simply a wrapper around a single regular TCP
socket, without any of the MPTCP protocol implemented over the wire.

Co-developed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Florian Westphal <fw@strlen.de>
Co-developed-by: Peter Krystad <peter.krystad@linux.intel.com>
Signed-off-by: Peter Krystad <peter.krystad@linux.intel.com>
Co-developed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Co-developed-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Christoph Paasch <cpaasch@apple.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mat Martineau
2020-01-21 16:56:15 -08:00
committed by David S. Miller
parent 23f4eacdd2
commit f870fa0b57
10 changed files with 212 additions and 0 deletions
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16
include/net/mptcp.h
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@@ -28,6 +28,8 @@ struct mptcp_ext {
#ifdef CONFIG_MPTCP
void mptcp_init(void);
/* move the skb extension owership, with the assumption that 'to' is
* newly allocated
*/
@@ -70,6 +72,10 @@ static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
#else
static inline void mptcp_init(void)
{
}
static inline void mptcp_skb_ext_move(struct sk_buff *to,
const struct sk_buff *from)
{
@@ -82,4 +88,14 @@ static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
}
#endif /* CONFIG_MPTCP */
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
int mptcpv6_init(void);
#elif IS_ENABLED(CONFIG_IPV6)
static inline int mptcpv6_init(void)
{
return 0;
}
#endif
#endif /* __NET_MPTCP_H */