diff options
| author |   Paolo Abeni <pabeni@redhat.com> | 2020-11-03 11:05:05 -0800 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2020-11-04 17:45:53 -0800 |
| commit | 5a369ca64364b49caff424d2f988901bc7658b6d (patch) | |
| tree | 4af5d3c6d1086f2d64adde122e2b780eb326011f /include/net/mptcp.h | |
| parent | mptcp: use _fast lock version in __mptcp_move_skbs (diff) | |
| download | linux-dev-5a369ca64364b49caff424d2f988901bc7658b6d.tar.xz linux-dev-5a369ca64364b49caff424d2f988901bc7658b6d.zip | |
tcp: propagate MPTCP skb extensions on xmit splits
When the TCP stack splits a packet on the write queue, the tail
half currently lose the associated skb extensions, and will not
carry the DSM on the wire.
The above does not cause functional problems and is allowed by
the RFC, but interact badly with GRO and RX coalescing, as possible
candidates for aggregation will carry different TCP options.
This change tries to improve the MPTCP behavior, propagating the
skb extensions on split.
Additionally, we must prevent the MPTCP stack from updating the
mapping after the split occur: that will both violate the RFC and
fool the reader.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/net/mptcp.h')
| -rw-r--r-- | include/net/mptcp.h | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/include/net/mptcp.h b/include/net/mptcp.h index 753ba7e755d6..6e706d838e4e 100644 --- a/include/net/mptcp.h +++ b/include/net/mptcp.h @@ -29,7 +29,8 @@ struct mptcp_ext { use_ack:1, ack64:1, mpc_map:1, - __unused:2; + frozen:1, + __unused:1; /* one byte hole */ }; @@ -106,6 +107,19 @@ static inline void mptcp_skb_ext_move(struct sk_buff *to, from->active_extensions = 0; } +static inline void mptcp_skb_ext_copy(struct sk_buff *to, + struct sk_buff *from) +{ + struct mptcp_ext *from_ext; + + from_ext = skb_ext_find(from, SKB_EXT_MPTCP); + if (!from_ext) + return; + + from_ext->frozen = 1; + skb_ext_copy(to, from); +} + static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext, const struct mptcp_ext *from_ext) { @@ -193,6 +207,11 @@ static inline void mptcp_skb_ext_move(struct sk_buff *to, { } +static inline void mptcp_skb_ext_copy(struct sk_buff *to, + struct sk_buff *from) +{ +} + static inline bool mptcp_skb_can_collapse(const struct sk_buff *to, const struct sk_buff *from) { |