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mptcp: init mptcp request socket earlier 

The mptcp subflow route_req() callback performs the subflow
req initialization after the route_req() check. If the latter
fails, mptcp-specific bits of the current request sockets
are left uninitialized.

The above causes bad things at req socket disposal time, when
the mptcp resources are cleared.

This change addresses the issue by splitting subflow_init_req()
into the actual initialization and the mptcp-specific checks.
The initialization is moved before any possibly failing check.

Reported-by: Christoph Paasch <cpaasch@apple.com>
Fixes: 7ea851d19b ("tcp: merge 'init_req' and 'route_req' functions")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2021-02-11 15:30:40 -08:00 committed by David S. Miller
parent 64b9cea7a0
commit d8b59efa64
1 changed files with 22 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
net/mptcp/subflow.c
View File

@ -92,7 +92,7 @@ static struct mptcp_sock *subflow_token_join_request(struct request_sock *req,
return msk;
}
static int __subflow_init_req(struct request_sock *req, const struct sock *sk_listener)
static void subflow_init_req(struct request_sock *req, const struct sock *sk_listener)
{
struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req);
@ -100,6 +100,22 @@ static int __subflow_init_req(struct request_sock *req, const struct sock *sk_li
subflow_req->mp_join = 0;
subflow_req->msk = NULL;
mptcp_token_init_request(req);
}
/* Init mptcp request socket.
*
* Returns an error code if a JOIN has failed and a TCP reset
* should be sent.
*/
static int subflow_check_req(struct request_sock *req,
const struct sock *sk_listener,
struct sk_buff *skb)
{
struct mptcp_subflow_context *listener = mptcp_subflow_ctx(sk_listener);
struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req);
struct mptcp_options_received mp_opt;
pr_debug("subflow_req=%p, listener=%p", subflow_req, listener);
#ifdef CONFIG_TCP_MD5SIG
/* no MPTCP if MD5SIG is enabled on this socket or we may run out of
@ -109,29 +125,6 @@ static int __subflow_init_req(struct request_sock *req, const struct sock *sk_li
return -EINVAL;
#endif
return 0;
}
/* Init mptcp request socket.
*
* Returns an error code if a JOIN has failed and a TCP reset
* should be sent.
*/
static int subflow_init_req(struct request_sock *req,
const struct sock *sk_listener,
struct sk_buff *skb)
{
struct mptcp_subflow_context *listener = mptcp_subflow_ctx(sk_listener);
struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req);
struct mptcp_options_received mp_opt;
int ret;
pr_debug("subflow_req=%p, listener=%p", subflow_req, listener);
ret = __subflow_init_req(req, sk_listener);
if (ret)
return 0;
mptcp_get_options(skb, &mp_opt);
if (mp_opt.mp_capable) {
@ -205,10 +198,7 @@ int mptcp_subflow_init_cookie_req(struct request_sock *req,
struct mptcp_options_received mp_opt;
int err;
err = __subflow_init_req(req, sk_listener);
if (err)
return err;
subflow_init_req(req, sk_listener);
mptcp_get_options(skb, &mp_opt);
if (mp_opt.mp_capable && mp_opt.mp_join)
@ -248,12 +238,13 @@ static struct dst_entry *subflow_v4_route_req(const struct sock *sk,
int err;
tcp_rsk(req)->is_mptcp = 1;
subflow_init_req(req, sk);
dst = tcp_request_sock_ipv4_ops.route_req(sk, skb, fl, req);
if (!dst)
return NULL;
err = subflow_init_req(req, sk, skb);
err = subflow_check_req(req, sk, skb);
if (err == 0)
return dst;
@ -273,12 +264,13 @@ static struct dst_entry *subflow_v6_route_req(const struct sock *sk,
int err;
tcp_rsk(req)->is_mptcp = 1;
subflow_init_req(req, sk);
dst = tcp_request_sock_ipv6_ops.route_req(sk, skb, fl, req);
if (!dst)
return NULL;
err = subflow_init_req(req, sk, skb);
err = subflow_check_req(req, sk, skb);
if (err == 0)
return dst;