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sctp: add SCTP_EXPOSE_POTENTIALLY_FAILED_STATE sockopt 

This is a sockopt defined in section 7.3 of rfc7829: "Exposing
the Potentially Failed Path State", by which users can change
pf_expose per sock and asoc.

The new sockopt SCTP_EXPOSE_POTENTIALLY_FAILED_STATE is also
known as SCTP_EXPOSE_PF_STATE for short.

v2->v3:
  - return -EINVAL if params.assoc_value > SCTP_PF_EXPOSE_MAX.
  - define SCTP_EXPOSE_PF_STATE SCTP_EXPOSE_POTENTIALLY_FAILED_STATE.
v3->v4:
  - improve changelog.

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 13:20:34 +08:00 committed by David S. Miller
parent 768e15182d
commit 8d2a6935d8
2 changed files with 81 additions and 0 deletions
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2
include/uapi/linux/sctp.h
View File

@ -137,6 +137,8 @@ typedef __s32 sctp_assoc_t;
#define SCTP_ASCONF_SUPPORTED 128
#define SCTP_AUTH_SUPPORTED 129
#define SCTP_ECN_SUPPORTED 130
#define SCTP_EXPOSE_POTENTIALLY_FAILED_STATE 131
#define SCTP_EXPOSE_PF_STATE SCTP_EXPOSE_POTENTIALLY_FAILED_STATE
/* PR-SCTP policies */
#define SCTP_PR_SCTP_NONE 0x0000

79
net/sctp/socket.c
View File

@ -4589,6 +4589,40 @@ static int sctp_setsockopt_ecn_supported(struct sock *sk,
return retval;
}
static int sctp_setsockopt_pf_expose(struct sock *sk,
char __user *optval,
unsigned int optlen)
{
struct sctp_assoc_value params;
struct sctp_association *asoc;
int retval = -EINVAL;
if (optlen != sizeof(params))
goto out;
if (copy_from_user(&params, optval, optlen)) {
retval = -EFAULT;
goto out;
}
if (params.assoc_value > SCTP_PF_EXPOSE_MAX)
goto out;
asoc = sctp_id2assoc(sk, params.assoc_id);
if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
sctp_style(sk, UDP))
goto out;
if (asoc)
asoc->pf_expose = params.assoc_value;
else
sctp_sk(sk)->pf_expose = params.assoc_value;
retval = 0;
out:
return retval;
}
/* API 6.2 setsockopt(), getsockopt()
*
* Applications use setsockopt() and getsockopt() to set or retrieve
@ -4798,6 +4832,9 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
case SCTP_ECN_SUPPORTED:
retval = sctp_setsockopt_ecn_supported(sk, optval, optlen);
break;
case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
retval = sctp_setsockopt_pf_expose(sk, optval, optlen);
break;
default:
retval = -ENOPROTOOPT;
break;
@ -7909,6 +7946,45 @@ static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
return retval;
}
static int sctp_getsockopt_pf_expose(struct sock *sk, int len,
char __user *optval,
int __user *optlen)
{
struct sctp_assoc_value params;
struct sctp_association *asoc;
int retval = -EFAULT;
if (len < sizeof(params)) {
retval = -EINVAL;
goto out;
}
len = sizeof(params);
if (copy_from_user(&params, optval, len))
goto out;
asoc = sctp_id2assoc(sk, params.assoc_id);
if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
sctp_style(sk, UDP)) {
retval = -EINVAL;
goto out;
}
params.assoc_value = asoc ? asoc->pf_expose
: sctp_sk(sk)->pf_expose;
if (put_user(len, optlen))
goto out;
if (copy_to_user(optval, &params, len))
goto out;
retval = 0;
out:
return retval;
}
static int sctp_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen)
{
@ -8121,6 +8197,9 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname,
case SCTP_ECN_SUPPORTED:
retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
break;
case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
retval = sctp_getsockopt_pf_expose(sk, len, optval, optlen);
break;
default:
retval = -ENOPROTOOPT;
break;