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| author |   Mat Martineau <mathew.j.martineau@linux.intel.com> | 2020-01-09 07:59:18 -0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2020-01-09 18:41:41 -0800 |
| commit | 1323059301c8f36d933876233516245d882346a6 (patch) | |
| tree | 0ad33261f1cc723e03993cdf85edc54b7703f9d9 /include/net | |
| parent | tcp: Add MPTCP option number (diff) | |
| download | linux-dev-1323059301c8f36d933876233516245d882346a6.tar.xz linux-dev-1323059301c8f36d933876233516245d882346a6.zip | |
tcp, ulp: Add clone operation to tcp_ulp_ops
If ULP is used on a listening socket, icsk_ulp_ops and icsk_ulp_data are
copied when the listener is cloned. Sometimes the clone is immediately
deleted, which will invoke the release op on the clone and likely
corrupt the listening socket's icsk_ulp_data.
The clone operation is invoked immediately after the clone is copied and
gives the ULP type an opportunity to set up the clone socket and its
icsk_ulp_data.
The MPTCP ULP clone will silently fallback to plain TCP on allocation
failure, so 'clone()' does not need to return an error code.
v6 -> v7:
- move and rename ulp clone helper to make it inline-friendly
v5 -> v6:
- clarified MPTCP clone usage in commit message
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/tcp.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 85f1d7ff6e8b..ac52633e7061 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2154,6 +2154,9 @@ struct tcp_ulp_ops { /* diagnostic */ int (*get_info)(const struct sock *sk, struct sk_buff *skb); size_t (*get_info_size)(const struct sock *sk); + /* clone ulp */ + void (*clone)(const struct request_sock *req, struct sock *newsk, + const gfp_t priority); char name[TCP_ULP_NAME_MAX]; struct module *owner; |