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Message-Id: <20240605-tcp_ao-tracepoints-v2-3-e91e161282ef@gmail.com>
Date: Wed, 05 Jun 2024 03:20:04 +0100
From: Dmitry Safonov via B4 Relay <devnull+0x7f454c46.gmail.com@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>,
"David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, David Ahern <dsahern@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Jonathan Corbet <corbet@....net>
Cc: Mohammad Nassiri <mnassiri@...na.com>, Simon Horman <horms@...nel.org>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
Dmitry Safonov <0x7f454c46@...il.com>
Subject: [PATCH net-next v2 3/6] net/tcp: Move tcp_inbound_hash() from
headers
From: Dmitry Safonov <0x7f454c46@...il.com>
Two reasons:
1. It's grown up enough
2. In order to not do header spaghetti by including
<trace/events/tcp.h>, which is necessary for TCP tracepoints.
Signed-off-by: Dmitry Safonov <0x7f454c46@...il.com>
---
include/net/tcp.h | 65 ++++---------------------------------------------------
net/ipv4/tcp.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 67 insertions(+), 61 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index f6dd035e0fa9..ba594ef70c2d 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2806,66 +2806,9 @@ static inline bool tcp_ao_required(struct sock *sk, const void *saddr,
return false;
}
-/* Called with rcu_read_lock() */
-static inline enum skb_drop_reason
-tcp_inbound_hash(struct sock *sk, const struct request_sock *req,
- const struct sk_buff *skb,
- const void *saddr, const void *daddr,
- int family, int dif, int sdif)
-{
- const struct tcphdr *th = tcp_hdr(skb);
- const struct tcp_ao_hdr *aoh;
- const __u8 *md5_location;
- int l3index;
-
- /* Invalid option or two times meet any of auth options */
- if (tcp_parse_auth_options(th, &md5_location, &aoh)) {
- tcp_hash_fail("TCP segment has incorrect auth options set",
- family, skb, "");
- return SKB_DROP_REASON_TCP_AUTH_HDR;
- }
-
- if (req) {
- if (tcp_rsk_used_ao(req) != !!aoh) {
- NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD);
- tcp_hash_fail("TCP connection can't start/end using TCP-AO",
- family, skb, "%s",
- !aoh ? "missing AO" : "AO signed");
- return SKB_DROP_REASON_TCP_AOFAILURE;
- }
- }
-
- /* sdif set, means packet ingressed via a device
- * in an L3 domain and dif is set to the l3mdev
- */
- l3index = sdif ? dif : 0;
-
- /* Fast path: unsigned segments */
- if (likely(!md5_location && !aoh)) {
- /* Drop if there's TCP-MD5 or TCP-AO key with any rcvid/sndid
- * for the remote peer. On TCP-AO established connection
- * the last key is impossible to remove, so there's
- * always at least one current_key.
- */
- if (tcp_ao_required(sk, saddr, family, l3index, true)) {
- tcp_hash_fail("AO hash is required, but not found",
- family, skb, "L3 index %d", l3index);
- return SKB_DROP_REASON_TCP_AONOTFOUND;
- }
- if (unlikely(tcp_md5_do_lookup(sk, l3index, saddr, family))) {
- NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
- tcp_hash_fail("MD5 Hash not found",
- family, skb, "L3 index %d", l3index);
- return SKB_DROP_REASON_TCP_MD5NOTFOUND;
- }
- return SKB_NOT_DROPPED_YET;
- }
-
- if (aoh)
- return tcp_inbound_ao_hash(sk, skb, family, req, l3index, aoh);
-
- return tcp_inbound_md5_hash(sk, skb, saddr, daddr, family,
- l3index, md5_location);
-}
+enum skb_drop_reason tcp_inbound_hash(struct sock *sk,
+ const struct request_sock *req, const struct sk_buff *skb,
+ const void *saddr, const void *daddr,
+ int family, int dif, int sdif);
#endif /* _TCP_H */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 5fa68e7f6ddb..99fea9919b08 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -4512,6 +4512,69 @@ EXPORT_SYMBOL(tcp_inbound_md5_hash);
#endif
+/* Called with rcu_read_lock() */
+enum skb_drop_reason
+tcp_inbound_hash(struct sock *sk, const struct request_sock *req,
+ const struct sk_buff *skb,
+ const void *saddr, const void *daddr,
+ int family, int dif, int sdif)
+{
+ const struct tcphdr *th = tcp_hdr(skb);
+ const struct tcp_ao_hdr *aoh;
+ const __u8 *md5_location;
+ int l3index;
+
+ /* Invalid option or two times meet any of auth options */
+ if (tcp_parse_auth_options(th, &md5_location, &aoh)) {
+ tcp_hash_fail("TCP segment has incorrect auth options set",
+ family, skb, "");
+ return SKB_DROP_REASON_TCP_AUTH_HDR;
+ }
+
+ if (req) {
+ if (tcp_rsk_used_ao(req) != !!aoh) {
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD);
+ tcp_hash_fail("TCP connection can't start/end using TCP-AO",
+ family, skb, "%s",
+ !aoh ? "missing AO" : "AO signed");
+ return SKB_DROP_REASON_TCP_AOFAILURE;
+ }
+ }
+
+ /* sdif set, means packet ingressed via a device
+ * in an L3 domain and dif is set to the l3mdev
+ */
+ l3index = sdif ? dif : 0;
+
+ /* Fast path: unsigned segments */
+ if (likely(!md5_location && !aoh)) {
+ /* Drop if there's TCP-MD5 or TCP-AO key with any rcvid/sndid
+ * for the remote peer. On TCP-AO established connection
+ * the last key is impossible to remove, so there's
+ * always at least one current_key.
+ */
+ if (tcp_ao_required(sk, saddr, family, l3index, true)) {
+ tcp_hash_fail("AO hash is required, but not found",
+ family, skb, "L3 index %d", l3index);
+ return SKB_DROP_REASON_TCP_AONOTFOUND;
+ }
+ if (unlikely(tcp_md5_do_lookup(sk, l3index, saddr, family))) {
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
+ tcp_hash_fail("MD5 Hash not found",
+ family, skb, "L3 index %d", l3index);
+ return SKB_DROP_REASON_TCP_MD5NOTFOUND;
+ }
+ return SKB_NOT_DROPPED_YET;
+ }
+
+ if (aoh)
+ return tcp_inbound_ao_hash(sk, skb, family, req, l3index, aoh);
+
+ return tcp_inbound_md5_hash(sk, skb, saddr, daddr, family,
+ l3index, md5_location);
+}
+EXPORT_SYMBOL_GPL(tcp_inbound_hash);
+
void tcp_done(struct sock *sk)
{
struct request_sock *req;
--
2.42.0
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