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authorMat Martineau <mathew.j.martineau@linux.intel.com>2020-01-21 16:56:23 -0800
committerDavid S. Miller <davem@davemloft.net>2020-01-24 13:44:07 +0100
commit6d0060f600adfddaa43fefb96b6b12643331961e (patch)
treee619ccf0b4df57bc1958c4bcc0c142b85446aba7 /include/net
parentmptcp: Add setsockopt()/getsockopt() socket operations (diff)
downloadlinux-dev-6d0060f600adfddaa43fefb96b6b12643331961e.tar.xz
linux-dev-6d0060f600adfddaa43fefb96b6b12643331961e.zip
mptcp: Write MPTCP DSS headers to outgoing data packets
Per-packet metadata required to write the MPTCP DSS option is written to the skb_ext area. One write to the socket may contain more than one packet of data, which is copied to page fragments and mapped in to MPTCP DSS segments with size determined by the available page fragments and the maximum mapping length allowed by the MPTCP specification. If do_tcp_sendpages() splits a DSS segment in to multiple skbs, that's ok - the later skbs can either have duplicated DSS mapping information or none at all, and the receiver can handle that. The current implementation uses the subflow frag cache and tcp sendpages to avoid excessive code duplication. More work is required to ensure that it works correctly under memory pressure and to support MPTCP-level retransmissions. The MPTCP DSS checksum is not yet implemented. Co-developed-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Co-developed-by: Peter Krystad <peter.krystad@linux.intel.com> Signed-off-by: Peter Krystad <peter.krystad@linux.intel.com> Co-developed-by: Florian Westphal <fw@strlen.de> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Christoph Paasch <cpaasch@apple.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/mptcp.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/mptcp.h b/include/net/mptcp.h
index eabc57c3fde4..06dcc665135e 100644
--- a/include/net/mptcp.h
+++ b/include/net/mptcp.h
@@ -32,6 +32,7 @@ struct mptcp_out_options {
u16 suboptions;
u64 sndr_key;
u64 rcvr_key;
+ struct mptcp_ext ext_copy;
#endif
};