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authorPetar Penkov <ppenkov@google.com>2019-07-29 09:59:14 -0700
committerAlexei Starovoitov <ast@kernel.org>2019-07-30 21:03:05 -0700
commit9349d600fb6a1ca0aaeb515523e1bb5409483d76 (patch)
tree214a3a4b68356a5977e75afe2117538810b64d10 /include/net/tcp.h
parenttcp: tcp_syn_flood_action read port from socket (diff)
downloadlinux-dev-9349d600fb6a1ca0aaeb515523e1bb5409483d76.tar.xz
linux-dev-9349d600fb6a1ca0aaeb515523e1bb5409483d76.zip
tcp: add skb-less helpers to retrieve SYN cookie
This patch allows generation of a SYN cookie before an SKB has been allocated, as is the case at XDP. Signed-off-by: Petar Penkov <ppenkov@google.com> Reviewed-by: Lorenz Bauer <lmb@cloudflare.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to '')
-rw-r--r--include/net/tcp.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index e5cf514ba118..fb7e153aecc5 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -415,6 +415,16 @@ void tcp_parse_options(const struct net *net, const struct sk_buff *skb,
const u8 *tcp_parse_md5sig_option(const struct tcphdr *th);
/*
+ * BPF SKB-less helpers
+ */
+u16 tcp_v4_get_syncookie(struct sock *sk, struct iphdr *iph,
+ struct tcphdr *th, u32 *cookie);
+u16 tcp_v6_get_syncookie(struct sock *sk, struct ipv6hdr *iph,
+ struct tcphdr *th, u32 *cookie);
+u16 tcp_get_syncookie_mss(struct request_sock_ops *rsk_ops,
+ const struct tcp_request_sock_ops *af_ops,
+ struct sock *sk, struct tcphdr *th);
+/*
* TCP v4 functions exported for the inet6 API
*/