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sctp: add SCTP_PEER_ADDR_THLDS_V2 sockopt

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Section 7.2 of rfc7829: "Peer Address Thresholds (SCTP_PEER_ADDR_THLDS)
Socket Option" extends 'struct sctp_paddrthlds' with 'spt_pathcpthld'
added to allow a user to change ps_retrans per sock/asoc/transport, as
other 2 paddrthlds: pf_retrans, pathmaxrxt.

Note: to not break the user's program, here to support pf_retrans dump
and setting by adding a new sockopt SCTP_PEER_ADDR_THLDS_V2, and a new
structure sctp_paddrthlds_v2 instead of extending sctp_paddrthlds.

Also, when setting ps_retrans, the value is not allowed to be greater
than pf_retrans.

v1->v2:
  - use SCTP_PEER_ADDR_THLDS_V2 to set/get pf_retrans instead,
    as Marcelo and David Laight suggested.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long
2019-11-08 13:20:36 +08:00
committed by David S. Miller
parent 34515e94c9
commit d467ac0a38
2 changed files with 50 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
include/uapi/linux/sctp.h
View File

@@ -105,6 +105,7 @@ typedef __s32 sctp_assoc_t;
#define SCTP_DEFAULT_SNDINFO 34
#define SCTP_AUTH_DEACTIVATE_KEY 35
#define SCTP_REUSE_PORT 36
#define SCTP_PEER_ADDR_THLDS_V2 37
/* Internal Socket Options. Some of the sctp library functions are
* implemented using these socket options.
@@ -1087,6 +1088,15 @@ struct sctp_paddrthlds {
__u16 spt_pathpfthld;
};
/* Use a new structure with spt_pathcpthld for back compatibility */
struct sctp_paddrthlds_v2 {
sctp_assoc_t spt_assoc_id;
struct sockaddr_storage spt_address;
__u16 spt_pathmaxrxt;
__u16 spt_pathpfthld;
__u16 spt_pathcpthld;
};
/*
* Socket Option for Getting the Association/Stream-Specific PR-SCTP Status
*/