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mptcp: add netlink-based PM

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Expose a new netlink family to userspace to control the PM, setting:

 - list of local addresses to be signalled.
 - list of local addresses used to created subflows.
 - maximum number of add_addr option to react

When the msk is fully established, the PM netlink attempts to
announce the 'signal' list via the ADD_ADDR option. Since we
currently lack the ADD_ADDR echo (and related event) only the
first addr is sent.

After exhausting the 'announce' list, the PM tries to create
subflow for each addr in 'local' list, waiting for each
connection to be completed before attempting the next one.

Idea is to add an additional PM hook for ADD_ADDR echo, to allow
the PM netlink announcing multiple addresses, in sequence.

Co-developed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2020-03-27 14:48:51 -07:00 • committed by David S. Miller
parent fc518953bc
commit 01cacb00b3
5 changed files with 928 additions and 2 deletions
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54
include/uapi/linux/mptcp.h
View file

@ -32,4 +32,58 @@ enum {
};
#define MPTCP_SUBFLOW_ATTR_MAX (__MPTCP_SUBFLOW_ATTR_MAX - 1)
/* netlink interface */
#define MPTCP_PM_NAME "mptcp_pm"
#define MPTCP_PM_CMD_GRP_NAME "mptcp_pm_cmds"
#define MPTCP_PM_VER 0x1
/*
* ATTR types defined for MPTCP
*/
enum {
MPTCP_PM_ATTR_UNSPEC,
MPTCP_PM_ATTR_ADDR, /* nested address */
MPTCP_PM_ATTR_RCV_ADD_ADDRS, /* u32 */
MPTCP_PM_ATTR_SUBFLOWS, /* u32 */
__MPTCP_PM_ATTR_MAX
};
#define MPTCP_PM_ATTR_MAX (__MPTCP_PM_ATTR_MAX - 1)
enum {
MPTCP_PM_ADDR_ATTR_UNSPEC,
MPTCP_PM_ADDR_ATTR_FAMILY, /* u16 */
MPTCP_PM_ADDR_ATTR_ID, /* u8 */
MPTCP_PM_ADDR_ATTR_ADDR4, /* struct in_addr */
MPTCP_PM_ADDR_ATTR_ADDR6, /* struct in6_addr */
MPTCP_PM_ADDR_ATTR_PORT, /* u16 */
MPTCP_PM_ADDR_ATTR_FLAGS, /* u32 */
MPTCP_PM_ADDR_ATTR_IF_IDX, /* s32 */
__MPTCP_PM_ADDR_ATTR_MAX
};
#define MPTCP_PM_ADDR_ATTR_MAX (__MPTCP_PM_ADDR_ATTR_MAX - 1)
#define MPTCP_PM_ADDR_FLAG_SIGNAL (1 << 0)
#define MPTCP_PM_ADDR_FLAG_SUBFLOW (1 << 1)
#define MPTCP_PM_ADDR_FLAG_BACKUP (1 << 2)
enum {
MPTCP_PM_CMD_UNSPEC,
MPTCP_PM_CMD_ADD_ADDR,
MPTCP_PM_CMD_DEL_ADDR,
MPTCP_PM_CMD_GET_ADDR,
MPTCP_PM_CMD_FLUSH_ADDRS,
MPTCP_PM_CMD_SET_LIMITS,
MPTCP_PM_CMD_GET_LIMITS,
__MPTCP_PM_CMD_AFTER_LAST
};
#endif /* _UAPI_MPTCP_H */