linux-kernel - Re: [PATCH v21 20/24] ovpn: implement key add/get/del/swap via netlink

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Message-ID: <Z8braoc3yeBY7lcE@hog>
Date: Tue, 4 Mar 2025 13:00:42 +0100
From: Sabrina Dubroca <sd@...asysnail.net>
To: Antonio Quartulli <antonio@...nvpn.net>
Cc: netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Donald Hunter <donald.hunter@...il.com>,
	Shuah Khan <shuah@...nel.org>, ryazanov.s.a@...il.com,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Simon Horman <horms@...nel.org>, linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org, Xiao Liang <shaw.leon@...il.com>
Subject: Re: [PATCH v21 20/24] ovpn: implement key add/get/del/swap via
 netlink

2025-03-04, 01:33:50 +0100, Antonio Quartulli wrote:
>  int ovpn_nl_key_new_doit(struct sk_buff *skb, struct genl_info *info)
>  {
...
> +	pkr.slot = nla_get_u8(attrs[OVPN_A_KEYCONF_SLOT]);
> +	pkr.key.key_id = nla_get_u16(attrs[OVPN_A_KEYCONF_KEY_ID]);
> +	pkr.key.cipher_alg = nla_get_u16(attrs[OVPN_A_KEYCONF_CIPHER_ALG]);


[...]
> +static int ovpn_nl_send_key(struct sk_buff *skb, const struct genl_info *info,
> +			    u32 peer_id, enum ovpn_key_slot slot,
> +			    const struct ovpn_key_config *keyconf)
> +{
...
> +	if (nla_put_u32(skb, OVPN_A_KEYCONF_SLOT, slot) ||
> +	    nla_put_u32(skb, OVPN_A_KEYCONF_KEY_ID, keyconf->key_id) ||
> +	    nla_put_u32(skb, OVPN_A_KEYCONF_CIPHER_ALG, keyconf->cipher_alg))

That's a bit inconsistent. nla_put_u32 matches the generated policy,
but the nla_get_u{8,16} don't (and nla_get_u16 also doesn't match "u8
key_id" it's getting stored into).

[also kind of curious that the policy/spec uses U32 with max values of 1/2/7]



>  int ovpn_nl_key_get_doit(struct sk_buff *skb, struct genl_info *info)
>  {
...
> +	slot = nla_get_u32(attrs[OVPN_A_KEYCONF_SLOT]);



>  int ovpn_nl_key_del_doit(struct sk_buff *skb, struct genl_info *info)
>  {
...
> +	slot = nla_get_u8(attrs[OVPN_A_KEYCONF_SLOT]);



A few more inconsistencies:

* OVPN_A_IFNAME is defined in the uapi but never used (I guess
  leftover from genl link creation)

* OVPN_A_PEER_DEL_REASON (u32 vs u8)
drivers/net/ovpn/netlink-gen.c:52:      [OVPN_A_PEER_DEL_REASON] = NLA_POLICY_MAX(NLA_U32, 4),
drivers/net/ovpn/netlink.c:1131:        if (nla_put_u8(msg, OVPN_A_PEER_DEL_REASON, peer->delete_reason))

* OVPN_A_PEER_LINK_TX_PACKETS/OVPN_A_PEER_LINK_RX_PACKETS (uint vs u32):
drivers/net/ovpn/netlink-gen.c-57-      [OVPN_A_PEER_LINK_RX_BYTES] = { .type = NLA_UINT, },
drivers/net/ovpn/netlink-gen.c-58-      [OVPN_A_PEER_LINK_TX_BYTES] = { .type = NLA_UINT, },
drivers/net/ovpn/netlink-gen.c-59-      [OVPN_A_PEER_LINK_RX_PACKETS] = { .type = NLA_U32, },
drivers/net/ovpn/netlink-gen.c:60:      [OVPN_A_PEER_LINK_TX_PACKETS] = { .type = NLA_U32, },
--
drivers/net/ovpn/netlink.c-618-     /* link RX stats */
drivers/net/ovpn/netlink.c-619-     nla_put_uint(skb, OVPN_A_PEER_LINK_RX_BYTES,
drivers/net/ovpn/netlink.c-620-                  atomic64_read(&peer->link_stats.rx.bytes)) ||
drivers/net/ovpn/netlink.c-621-     nla_put_uint(skb, OVPN_A_PEER_LINK_RX_PACKETS,
drivers/net/ovpn/netlink.c-622-                  atomic64_read(&peer->link_stats.rx.packets)) ||
drivers/net/ovpn/netlink.c-623-     /* link TX stats */
drivers/net/ovpn/netlink.c-624-     nla_put_uint(skb, OVPN_A_PEER_LINK_TX_BYTES,
drivers/net/ovpn/netlink.c-625-                  atomic64_read(&peer->link_stats.tx.bytes)) ||
drivers/net/ovpn/netlink.c:626:     nla_put_uint(skb, OVPN_A_PEER_LINK_TX_PACKETS,
drivers/net/ovpn/netlink.c-627-                  atomic64_read(&peer->link_stats.tx.packets)))

I guess all the stats should be UINT.

-- 
Sabrina