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sctp: add SCTP_AUTH_SUPPORTED sockopt 

SCTP_AUTH_SUPPORTED sockopt is used to set enpoint's auth
flag. With this feature, each endpoint will have its own
flag for its future asoc's auth_capable, instead of netns
auth flag.

Note that when both ep's auth_enable is enabled, endpoint
auth related data should be initialized. If asconf_enable
is also set, SCTP_CID_ASCONF/SCTP_CID_ASCONF_ACK should
be added into auth_chunk_list.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2019-08-19 22:02:49 +08:00 committed by David S. Miller
parent 03f961270f
commit 56dd525abd
2 changed files with 87 additions and 0 deletions
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1
include/uapi/linux/sctp.h
View File

@ -135,6 +135,7 @@ typedef __s32 sctp_assoc_t;
#define SCTP_SENDMSG_CONNECT 126
#define SCTP_EVENT 127
#define SCTP_ASCONF_SUPPORTED 128
#define SCTP_AUTH_SUPPORTED 129
/* PR-SCTP policies */
#define SCTP_PR_SCTP_NONE 0x0000

86
net/sctp/socket.c
View File

@ -4520,6 +4520,46 @@ static int sctp_setsockopt_asconf_supported(struct sock *sk,
return retval;
}
static int sctp_setsockopt_auth_supported(struct sock *sk,
char __user *optval,
unsigned int optlen)
{
struct sctp_assoc_value params;
struct sctp_association *asoc;
struct sctp_endpoint *ep;
int retval = -EINVAL;
if (optlen != sizeof(params))
goto out;
if (copy_from_user(&params, optval, optlen)) {
retval = -EFAULT;
goto out;
}
asoc = sctp_id2assoc(sk, params.assoc_id);
if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
sctp_style(sk, UDP))
goto out;
ep = sctp_sk(sk)->ep;
if (params.assoc_value) {
retval = sctp_auth_init(ep, GFP_KERNEL);
if (retval)
goto out;
if (ep->asconf_enable) {
sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
}
}
ep->auth_enable = !!params.assoc_value;
retval = 0;
out:
return retval;
}
/* API 6.2 setsockopt(), getsockopt()
*
* Applications use setsockopt() and getsockopt() to set or retrieve
@ -4723,6 +4763,9 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
case SCTP_ASCONF_SUPPORTED:
retval = sctp_setsockopt_asconf_supported(sk, optval, optlen);
break;
case SCTP_AUTH_SUPPORTED:
retval = sctp_setsockopt_auth_supported(sk, optval, optlen);
break;
default:
retval = -ENOPROTOOPT;
break;
@ -7746,6 +7789,45 @@ static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
return retval;
}
static int sctp_getsockopt_auth_supported(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->peer.auth_capable
: sctp_sk(sk)->ep->auth_enable;
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)
{
@ -7951,6 +8033,10 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname,
retval = sctp_getsockopt_asconf_supported(sk, len, optval,
optlen);
break;
case SCTP_AUTH_SUPPORTED:
retval = sctp_getsockopt_auth_supported(sk, len, optval,
optlen);
break;
default:
retval = -ENOPROTOOPT;
break;