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mptcp: support rstreason for passive reset

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It relies on what reset options in the skb are as rfc8684 says. Reusing
this logic can save us much energy. This patch replaces most of the prior
NOT_SPECIFIED reasons.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Jason Xing 2024-04-25 11:13:38 +08:00 committed by Paolo Abeni
parent 120391ef9c
commit 3e140491dd
2 changed files with 44 additions and 5 deletions
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27
net/mptcp/protocol.h
View File

@ -581,6 +581,33 @@ mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow)
WRITE_ONCE(subflow->local_id, -1);
}
/* Convert reset reasons in MPTCP to enum sk_rst_reason type */
static inline enum sk_rst_reason
sk_rst_convert_mptcp_reason(u32 reason)
{
switch (reason) {
case MPTCP_RST_EUNSPEC:
return SK_RST_REASON_MPTCP_RST_EUNSPEC;
case MPTCP_RST_EMPTCP:
return SK_RST_REASON_MPTCP_RST_EMPTCP;
case MPTCP_RST_ERESOURCE:
return SK_RST_REASON_MPTCP_RST_ERESOURCE;
case MPTCP_RST_EPROHIBIT:
return SK_RST_REASON_MPTCP_RST_EPROHIBIT;
case MPTCP_RST_EWQ2BIG:
return SK_RST_REASON_MPTCP_RST_EWQ2BIG;
case MPTCP_RST_EBADPERF:
return SK_RST_REASON_MPTCP_RST_EBADPERF;
case MPTCP_RST_EMIDDLEBOX:
return SK_RST_REASON_MPTCP_RST_EMIDDLEBOX;
default:
/* It should not happen, or else errors may occur
* in MPTCP layer
*/
return SK_RST_REASON_ERROR;
}
}
static inline u64
mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
{

22
net/mptcp/subflow.c
View File

@ -309,8 +309,13 @@ static struct dst_entry *subflow_v4_route_req(const struct sock *sk,
return dst;
dst_release(dst);
if (!req->syncookie)
tcp_request_sock_ops.send_reset(sk, skb, SK_RST_REASON_NOT_SPECIFIED);
if (!req->syncookie) {
struct mptcp_ext *mpext = mptcp_get_ext(skb);
enum sk_rst_reason reason;
reason = sk_rst_convert_mptcp_reason(mpext->reset_reason);
tcp_request_sock_ops.send_reset(sk, skb, reason);
}
return NULL;
}
@ -377,8 +382,13 @@ static struct dst_entry *subflow_v6_route_req(const struct sock *sk,
return dst;
dst_release(dst);
if (!req->syncookie)
tcp6_request_sock_ops.send_reset(sk, skb, SK_RST_REASON_NOT_SPECIFIED);
if (!req->syncookie) {
struct mptcp_ext *mpext = mptcp_get_ext(skb);
enum sk_rst_reason reason;
reason = sk_rst_convert_mptcp_reason(mpext->reset_reason);
tcp6_request_sock_ops.send_reset(sk, skb, reason);
}
return NULL;
}
#endif
@ -783,6 +793,7 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk,
struct mptcp_subflow_request_sock *subflow_req;
struct mptcp_options_received mp_opt;
bool fallback, fallback_is_fatal;
enum sk_rst_reason reason;
struct mptcp_sock *owner;
struct sock *child;
@ -913,7 +924,8 @@ dispose_child:
tcp_rsk(req)->drop_req = true;
inet_csk_prepare_for_destroy_sock(child);
tcp_done(child);
req->rsk_ops->send_reset(sk, skb, SK_RST_REASON_NOT_SPECIFIED);
reason = sk_rst_convert_mptcp_reason(mptcp_get_ext(skb)->reset_reason);
req->rsk_ops->send_reset(sk, skb, reason);
/* The last child reference will be released by the caller */
return child;