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tcp: add skb-less helpers to retrieve SYN cookie

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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>
This commit is contained in:
Petar Penkov
2019-07-29 09:59:14 -07:00
committed by Alexei Starovoitov
parent 965112785e
commit 9349d600fb
4 changed files with 113 additions and 0 deletions
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15
net/ipv6/tcp_ipv6.c
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@@ -1063,6 +1063,21 @@ static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb)
return sk;
}
u16 tcp_v6_get_syncookie(struct sock *sk, struct ipv6hdr *iph,
struct tcphdr *th, u32 *cookie)
{
u16 mss = 0;
#ifdef CONFIG_SYN_COOKIES
mss = tcp_get_syncookie_mss(&tcp6_request_sock_ops,
&tcp_request_sock_ipv6_ops, sk, th);
if (mss) {
*cookie = __cookie_v6_init_sequence(iph, th, &mss);
tcp_synq_overflow(sk);
}
#endif
return mss;
}
static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
{
if (skb->protocol == htons(ETH_P_IP))