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sctp: add support for PR-SCTP Information for sendmsg

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This patch is to add support for PR-SCTP Information for sendmsg,
as described in section 5.3.7 of RFC6458.

With this option, you can specify pr_policy and pr_value for user
data in sendmsg.

It's also a necessary send info for sctp_sendv.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2018-03-05 20:44:18 +08:00 committed by David S. Miller
parent 5c3d0fd4b2
commit ed63afb8a3
3 changed files with 46 additions and 1 deletions
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1
include/net/sctp/structs.h
View File

@ -2112,6 +2112,7 @@ struct sctp_cmsgs {
struct sctp_initmsg *init;
struct sctp_sndrcvinfo *srinfo;
struct sctp_sndinfo *sinfo;
struct sctp_prinfo *prinfo;
};
/* Structure for tracking memory objects */

15
include/uapi/linux/sctp.h
View File

@ -260,6 +260,19 @@ struct sctp_nxtinfo {
sctp_assoc_t nxt_assoc_id;
};
/* 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
*
* This cmsghdr structure specifies SCTP options for sendmsg().
*
* cmsg_level cmsg_type cmsg_data[]
* ------------ ------------ -------------------
* IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
*/
struct sctp_prinfo {
__u16 pr_policy;
__u32 pr_value;
};
/*
* sinfo_flags: 16 bits (unsigned integer)
*
@ -293,6 +306,8 @@ typedef enum sctp_cmsg_type {
#define SCTP_RCVINFO SCTP_RCVINFO
SCTP_NXTINFO, /* 5.3.6 SCTP Next Receive Information Structure */
#define SCTP_NXTINFO SCTP_NXTINFO
SCTP_PRINFO, /* 5.3.7 SCTP PR-SCTP Information Structure */
#define SCTP_PRINFO SCTP_PRINFO
} sctp_cmsg_t;
/*

31
net/sctp/socket.c
View File

@ -1644,6 +1644,12 @@ static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
}
if (cmsgs->prinfo) {
srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
cmsgs->prinfo->pr_policy);
}
sflags = srinfo->sinfo_flags;
if (!sflags && msg_len)
return 0;
@ -1901,9 +1907,12 @@ static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
sinfo->sinfo_ppid = asoc->default_ppid;
sinfo->sinfo_context = asoc->default_context;
sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
if (!cmsgs->prinfo)
sinfo->sinfo_flags = asoc->default_flags;
}
if (!cmsgs->srinfo)
if (!cmsgs->srinfo && !cmsgs->prinfo)
sinfo->sinfo_timetolive = asoc->default_timetolive;
}
@ -7749,6 +7758,26 @@ static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
SCTP_ABORT | SCTP_EOF))
return -EINVAL;
break;
case SCTP_PRINFO:
/* SCTP Socket API Extension
* 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
*
* This cmsghdr structure specifies SCTP options for sendmsg().
*
* cmsg_level cmsg_type cmsg_data[]
* ------------ ------------ ---------------------
* IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
*/
if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
return -EINVAL;
cmsgs->prinfo = CMSG_DATA(cmsg);
if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
return -EINVAL;
if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
cmsgs->prinfo->pr_value = 0;
break;
default:
return -EINVAL;
}