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sctp: use SCTP_FUTURE_ASSOC and add SCTP_CURRENT_ASSOC for SCTP_CONTEXT sockopt 

Check with SCTP_ALL_ASSOC instead in sctp_setsockopt_context and
check with SCTP_FUTURE_ASSOC instead in sctp_getsockopt_context,
it's compatible with 0.

SCTP_CURRENT_ASSOC is supported for SCTP_CONTEXT in this patch.
It also adjusts some code to keep a same check form as other
functions.

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 2019-01-28 15:08:37 +08:00 committed by David S. Miller
parent 92fc3bd928
commit 49b037acca
1 changed files with 23 additions and 18 deletions
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41
net/sctp/socket.c
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@ -3510,8 +3510,8 @@ static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval
static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
unsigned int optlen)
{
struct sctp_sock *sp = sctp_sk(sk);
struct sctp_assoc_value params;
struct sctp_sock *sp;
struct sctp_association *asoc;
if (optlen != sizeof(struct sctp_assoc_value))
@ -3519,17 +3519,26 @@ static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
if (copy_from_user(&params, optval, optlen))
return -EFAULT;
sp = sctp_sk(sk);
asoc = sctp_id2assoc(sk, params.assoc_id);
if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
sctp_style(sk, UDP))
return -EINVAL;
if (params.assoc_id != 0) {
asoc = sctp_id2assoc(sk, params.assoc_id);
if (!asoc)
return -EINVAL;
if (asoc) {
asoc->default_rcv_context = params.assoc_value;
} else {
sp->default_rcv_context = params.assoc_value;
return 0;
}
if (params.assoc_id == SCTP_FUTURE_ASSOC ||
params.assoc_id == SCTP_ALL_ASSOC)
sp->default_rcv_context = params.assoc_value;
if (params.assoc_id == SCTP_CURRENT_ASSOC ||
params.assoc_id == SCTP_ALL_ASSOC)
list_for_each_entry(asoc, &sp->ep->asocs, asocs)
asoc->default_rcv_context = params.assoc_value;
return 0;
}
@ -6517,7 +6526,6 @@ static int sctp_getsockopt_context(struct sock *sk, int len,
char __user *optval, int __user *optlen)
{
struct sctp_assoc_value params;
struct sctp_sock *sp;
struct sctp_association *asoc;
if (len < sizeof(struct sctp_assoc_value))
@ -6528,16 +6536,13 @@ static int sctp_getsockopt_context(struct sock *sk, int len,
if (copy_from_user(&params, optval, len))
return -EFAULT;
sp = sctp_sk(sk);
asoc = sctp_id2assoc(sk, params.assoc_id);
if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
sctp_style(sk, UDP))
return -EINVAL;
if (params.assoc_id != 0) {
asoc = sctp_id2assoc(sk, params.assoc_id);
if (!asoc)
return -EINVAL;
params.assoc_value = asoc->default_rcv_context;
} else {
params.assoc_value = sp->default_rcv_context;
}
params.assoc_value = asoc ? asoc->default_rcv_context
: sctp_sk(sk)->default_rcv_context;
if (put_user(len, optlen))
return -EFAULT;