[PATCH v6 05/26] tcp: Refactor tcp_sig_hash_skb_data for AO

[Leonard Crestez]

This function feeds all SKB data into an ahash and this behavior is
identical between the TCP-MD5 and TCP-AO so rename and refactor.

Signed-off-by: Leonard Crestez <cdleonard@xxxxxxxxx>
---
 include/net/tcp.h   |  2 +-
 net/ipv4/tcp.c      | 17 ++++++++++++-----
 net/ipv4/tcp_ipv4.c |  2 +-
 net/ipv6/tcp_ipv6.c |  2 +-
 4 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 7d335f96238d..793e8802fef0 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1716,11 +1716,11 @@ struct tcp_md5sig_pool *tcp_get_md5sig_pool(void);
 static inline void tcp_put_md5sig_pool(void)
 {
 	local_bh_enable();
 }
 
-int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *, const struct sk_buff *,
+int tcp_sig_hash_skb_data(struct ahash_request *, const struct sk_buff *,
 			  unsigned int header_len);
 int tcp_md5_hash_key(struct tcp_md5sig_pool *hp,
 		     const struct tcp_md5sig_key *key);
 
 /* From tcp_fastopen.c */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 791f218b8c66..4cdc34200bcf 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -4468,16 +4468,19 @@ struct tcp_md5sig_pool *tcp_get_md5sig_pool(void)
 	local_bh_enable();
 	return NULL;
 }
 EXPORT_SYMBOL(tcp_get_md5sig_pool);
 
-int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp,
+#endif /* CONFIG_TCP_MD5SIG */
+
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AUTHOPT)
+
+int tcp_sig_hash_skb_data(struct ahash_request *req,
 			  const struct sk_buff *skb, unsigned int header_len)
 {
 	struct scatterlist sg;
 	const struct tcphdr *tp = tcp_hdr(skb);
-	struct ahash_request *req = hp->md5_req;
 	unsigned int i;
 	const unsigned int head_data_len = skb_headlen(skb) > header_len ?
 					   skb_headlen(skb) - header_len : 0;
 	const struct skb_shared_info *shi = skb_shinfo(skb);
 	struct sk_buff *frag_iter;
@@ -4500,16 +4503,20 @@ int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp,
 		if (crypto_ahash_update(req))
 			return 1;
 	}
 
 	skb_walk_frags(skb, frag_iter)
-		if (tcp_md5_hash_skb_data(hp, frag_iter, 0))
+		if (tcp_sig_hash_skb_data(req, frag_iter, 0))
 			return 1;
 
 	return 0;
 }
-EXPORT_SYMBOL(tcp_md5_hash_skb_data);
+EXPORT_SYMBOL(tcp_sig_hash_skb_data);
+
+#endif /* defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AUTHOPT) */
+
+#ifdef CONFIG_TCP_MD5SIG
 
 int tcp_md5_hash_key(struct tcp_md5sig_pool *hp, const struct tcp_md5sig_key *key)
 {
 	u8 keylen = READ_ONCE(key->keylen); /* paired with WRITE_ONCE() in tcp_md5_do_add */
 	struct scatterlist sg;
@@ -4587,11 +4594,11 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
 	}
 	return SKB_NOT_DROPPED_YET;
 }
 EXPORT_SYMBOL(tcp_inbound_md5_hash);
 
-#endif
+#endif /* CONFIG_TCP_MD5SIG */
 
 void tcp_done(struct sock *sk)
 {
 	struct request_sock *req;
 
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index d011937b8785..5c13d3460ce1 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1388,11 +1388,11 @@ int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key,
 	if (crypto_ahash_init(req))
 		goto clear_hash;
 
 	if (tcp_v4_md5_hash_headers(hp, daddr, saddr, th, skb->len))
 		goto clear_hash;
-	if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
+	if (tcp_sig_hash_skb_data(hp->md5_req, skb, th->doff << 2))
 		goto clear_hash;
 	if (tcp_md5_hash_key(hp, key))
 		goto clear_hash;
 	ahash_request_set_crypt(req, NULL, md5_hash, 0);
 	if (crypto_ahash_final(req))
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 85b8b765dcb1..16e85ae4f029 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -751,11 +751,11 @@ static int tcp_v6_md5_hash_skb(char *md5_hash,
 	if (crypto_ahash_init(req))
 		goto clear_hash;
 
 	if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len))
 		goto clear_hash;
-	if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
+	if (tcp_sig_hash_skb_data(hp->md5_req, skb, th->doff << 2))
 		goto clear_hash;
 	if (tcp_md5_hash_key(hp, key))
 		goto clear_hash;
 	ahash_request_set_crypt(req, NULL, md5_hash, 0);
 	if (crypto_ahash_final(req))
-- 
2.25.1