linux-kernel - [PATCH bpf-next v2 2/6] bpf: sockmap: merge sockmap and sockhash update functions

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Message-Id: <20200820135729.135783-3-lmb@cloudflare.com>
Date:   Thu, 20 Aug 2020 14:57:25 +0100
From:   Lorenz Bauer <lmb@...udflare.com>
To:     jakub@...udflare.com, john.fastabend@...il.com,
        Daniel Borkmann <daniel@...earbox.net>,
        Lorenz Bauer <lmb@...udflare.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>
Cc:     kernel-team@...udflare.com, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next v2 2/6] bpf: sockmap: merge sockmap and sockhash update functions

Merge the two very similar functions sock_map_update_elem and
sock_hash_update_elem into one.

Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
---
 net/core/sock_map.c | 49 +++++++--------------------------------------
 1 file changed, 7 insertions(+), 42 deletions(-)

diff --git a/net/core/sock_map.c b/net/core/sock_map.c
index abe4bac40db9..905e2dd765aa 100644
--- a/net/core/sock_map.c
+++ b/net/core/sock_map.c
@@ -559,10 +559,12 @@ static bool sock_map_sk_state_allowed(const struct sock *sk)
 	return false;
 }
 
+static int sock_hash_update_common(struct bpf_map *map, void *key,
+				   struct sock *sk, u64 flags);
+
 static int sock_map_update_elem(struct bpf_map *map, void *key,
 				void *value, u64 flags)
 {
-	u32 idx = *(u32 *)key;
 	struct socket *sock;
 	struct sock *sk;
 	int ret;
@@ -591,8 +593,10 @@ static int sock_map_update_elem(struct bpf_map *map, void *key,
 	sock_map_sk_acquire(sk);
 	if (!sock_map_sk_state_allowed(sk))
 		ret = -EOPNOTSUPP;
+	else if (map->map_type == BPF_MAP_TYPE_SOCKMAP)
+		ret = sock_map_update_common(map, *(u32 *)key, sk, flags);
 	else
-		ret = sock_map_update_common(map, idx, sk, flags);
+		ret = sock_hash_update_common(map, key, sk, flags);
 	sock_map_sk_release(sk);
 out:
 	fput(sock->file);
@@ -909,45 +913,6 @@ static int sock_hash_update_common(struct bpf_map *map, void *key,
 	return ret;
 }
 
-static int sock_hash_update_elem(struct bpf_map *map, void *key,
-				 void *value, u64 flags)
-{
-	struct socket *sock;
-	struct sock *sk;
-	int ret;
-	u64 ufd;
-
-	if (map->value_size == sizeof(u64))
-		ufd = *(u64 *)value;
-	else
-		ufd = *(u32 *)value;
-	if (ufd > S32_MAX)
-		return -EINVAL;
-
-	sock = sockfd_lookup(ufd, &ret);
-	if (!sock)
-		return ret;
-	sk = sock->sk;
-	if (!sk) {
-		ret = -EINVAL;
-		goto out;
-	}
-	if (!sock_map_sk_is_suitable(sk)) {
-		ret = -EOPNOTSUPP;
-		goto out;
-	}
-
-	sock_map_sk_acquire(sk);
-	if (!sock_map_sk_state_allowed(sk))
-		ret = -EOPNOTSUPP;
-	else
-		ret = sock_hash_update_common(map, key, sk, flags);
-	sock_map_sk_release(sk);
-out:
-	fput(sock->file);
-	return ret;
-}
-
 static int sock_hash_get_next_key(struct bpf_map *map, void *key,
 				  void *key_next)
 {
@@ -1216,7 +1181,7 @@ const struct bpf_map_ops sock_hash_ops = {
 	.map_alloc		= sock_hash_alloc,
 	.map_free		= sock_hash_free,
 	.map_get_next_key	= sock_hash_get_next_key,
-	.map_update_elem	= sock_hash_update_elem,
+	.map_update_elem	= sock_map_update_elem,
 	.map_delete_elem	= sock_hash_delete_elem,
 	.map_lookup_elem	= sock_hash_lookup,
 	.map_lookup_elem_sys_only = sock_hash_lookup_sys,
-- 
2.25.1