diff mbox series

[1/2] net/tcp: Separate tcp_md5sig_info allocation into tcp_md5sig_info_add()

Message ID 20221102211350.625011-2-dima@arista.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series net/tcp: Dynamically disable TCP-MD5 static key | expand

Checks

Context Check Description
netdev/tree_selection success Guessed tree name to be net-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix warning Target tree name not specified in the subject
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 20 this patch: 20
netdev/cc_maintainers success CCed 7 of 7 maintainers
netdev/build_clang success Errors and warnings before: 5 this patch: 5
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 20 this patch: 20
netdev/checkpatch warning WARNING: line length of 81 exceeds 80 columns
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Dmitry Safonov Nov. 2, 2022, 9:13 p.m. UTC 
Add a helper to allocate tcp_md5sig_info, that will help later to
do/allocate things when info allocated, once per socket.

Signed-off-by: Dmitry Safonov <dima@arista.com>
---
 net/ipv4/tcp_ipv4.c | 30 +++++++++++++++++++++---------
 1 file changed, 21 insertions(+), 9 deletions(-)

Comments

Eric Dumazet Nov. 2, 2022, 9:27 p.m. UTC | #1 
On Wed, Nov 2, 2022 at 2:14 PM Dmitry Safonov <dima@arista.com> wrote:
>
> Add a helper to allocate tcp_md5sig_info, that will help later to
> do/allocate things when info allocated, once per socket.
>
> Signed-off-by: Dmitry Safonov <dima@arista.com>
> ---


Reviewed-by: Eric Dumazet <edumazet@google.com>
diff mbox series

Patch

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 87d440f47a70..fae80b1a1796 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1172,6 +1172,24 @@  struct tcp_md5sig_key *tcp_v4_md5_lookup(const struct sock *sk,
 }
 EXPORT_SYMBOL(tcp_v4_md5_lookup);
 
+static int tcp_md5sig_info_add(struct sock *sk, gfp_t gfp)
+{
+	struct tcp_sock *tp = tcp_sk(sk);
+	struct tcp_md5sig_info *md5sig;
+
+	if (rcu_dereference_protected(tp->md5sig_info, lockdep_sock_is_held(sk)))
+		return 0;
+
+	md5sig = kmalloc(sizeof(*md5sig), gfp);
+	if (!md5sig)
+		return -ENOMEM;
+
+	sk_gso_disable(sk);
+	INIT_HLIST_HEAD(&md5sig->head);
+	rcu_assign_pointer(tp->md5sig_info, md5sig);
+	return 0;
+}
+
 /* This can be called on a newly created socket, from other files */
 int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
 		   int family, u8 prefixlen, int l3index, u8 flags,
@@ -1202,17 +1220,11 @@  int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
 		return 0;
 	}
 
+	if (tcp_md5sig_info_add(sk, gfp))
+		return -ENOMEM;
+
 	md5sig = rcu_dereference_protected(tp->md5sig_info,
 					   lockdep_sock_is_held(sk));
-	if (!md5sig) {
-		md5sig = kmalloc(sizeof(*md5sig), gfp);
-		if (!md5sig)
-			return -ENOMEM;
-
-		sk_gso_disable(sk);
-		INIT_HLIST_HEAD(&md5sig->head);
-		rcu_assign_pointer(tp->md5sig_info, md5sig);
-	}
 
 	key = sock_kmalloc(sk, sizeof(*key), gfp | __GFP_ZERO);
 	if (!key)