l2tp_nl_tunnel_send has conditionally compiled code to support AF_INET6,
which makes the code difficult to follow and triggers checkpatch
warnings.
Split the code out into functions to handle the AF_INET v.s. AF_INET6
cases, which both improves readability and resolves the checkpatch
warnings.
Signed-off-by: Tom Parkin <tpar...@katalix.com>
---
net/l2tp/l2tp_netlink.c | 126 ++++++++++++++++++++++------------------
1 file changed, 70 insertions(+), 56 deletions(-)
diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c
index ac5769ef8e20..8e03f2e367a0 100644
--- a/net/l2tp/l2tp_netlink.c
+++ b/net/l2tp/l2tp_netlink.c
@@ -310,16 +310,79 @@ static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb,
struct genl_info *info
return ret;
}
+#if IS_ENABLED(CONFIG_IPV6)
+static int l2tp_nl_tunnel_send_addr6(struct sk_buff *skb, struct sock *sk,
+ enum l2tp_encap_type encap)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ switch (encap) {
+ case L2TP_ENCAPTYPE_UDP:
+ if (udp_get_no_check6_tx(sk) &&
+ nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
+ return -1;
+ if (udp_get_no_check6_rx(sk) &&
+ nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
+ return -1;
+ if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT,
ntohs(inet->inet_sport)) ||
+ nla_put_u16(skb, L2TP_ATTR_UDP_DPORT,
ntohs(inet->inet_dport)))
+ return -1;
+ fallthrough;
+ case L2TP_ENCAPTYPE_IP:
+ if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR, &np->saddr) ||
+ nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR,
&sk->sk_v6_daddr))
+ return -1;
+ break;
+ }
+ return 0;
+}
+#endif
+
+static int l2tp_nl_tunnel_send_addr4(struct sk_buff *skb, struct sock *sk,
+ enum l2tp_encap_type encap)
+{
+ struct inet_sock *inet = inet_sk(sk);
+
+ switch (encap) {
+ case L2TP_ENCAPTYPE_UDP:
+ if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx) ||
+ nla_put_u16(skb, L2TP_ATTR_UDP_SPORT,
ntohs(inet->inet_sport)) ||
+ nla_put_u16(skb, L2TP_ATTR_UDP_DPORT,
ntohs(inet->inet_dport)))
+ return -1;
+ fallthrough;
+ case L2TP_ENCAPTYPE_IP:
+ if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr)
||
+ nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr))
+ return -1;
+ break;
+ }
+
+ return 0;
+}
+
+/* Append attributes for the tunnel address, handling the different attribute
types
+ * used for different tunnel encapsulation and AF_INET v.s. AF_INET6.
+ */
+static int l2tp_nl_tunnel_send_addr(struct sk_buff *skb, struct l2tp_tunnel
*tunnel)
+{
+ struct sock *sk = tunnel->sock;
+
+ if (!sk)
+ return 0;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (sk->sk_family == AF_INET6)
+ return l2tp_nl_tunnel_send_addr6(skb, sk, tunnel->encap);
+#endif
+ return l2tp_nl_tunnel_send_addr4(skb, sk, tunnel->encap);
+}
+
static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int
flags,
struct l2tp_tunnel *tunnel, u8 cmd)
{
void *hdr;
struct nlattr *nest;
- struct sock *sk = NULL;
- struct inet_sock *inet;
-#if IS_ENABLED(CONFIG_IPV6)
- struct ipv6_pinfo *np = NULL;
-#endif
hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
if (!hdr)
@@ -363,58 +426,9 @@ static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32
portid, u32 seq, int fla
goto nla_put_failure;
nla_nest_end(skb, nest);
- sk = tunnel->sock;
- if (!sk)
- goto out;
-
-#if IS_ENABLED(CONFIG_IPV6)
- if (sk->sk_family == AF_INET6)
- np = inet6_sk(sk);
-#endif
-
- inet = inet_sk(sk);
-
- switch (tunnel->encap) {
- case L2TP_ENCAPTYPE_UDP:
- switch (sk->sk_family) {
- case AF_INET:
- if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM,
!sk->sk_no_check_tx))
- goto nla_put_failure;
- break;
-#if IS_ENABLED(CONFIG_IPV6)
- case AF_INET6:
- if (udp_get_no_check6_tx(sk) &&
- nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
- goto nla_put_failure;
- if (udp_get_no_check6_rx(sk) &&
- nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
- goto nla_put_failure;
- break;
-#endif
- }
- if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT,
ntohs(inet->inet_sport)) ||
- nla_put_u16(skb, L2TP_ATTR_UDP_DPORT,
ntohs(inet->inet_dport)))
- goto nla_put_failure;
- /* fall through */
- case L2TP_ENCAPTYPE_IP:
-#if IS_ENABLED(CONFIG_IPV6)
- if (np) {
- if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR,
- &np->saddr) ||
- nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR,
- &sk->sk_v6_daddr))
- goto nla_put_failure;
- } else
-#endif
- if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR,
- inet->inet_saddr) ||
- nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR,
- inet->inet_daddr))
- goto nla_put_failure;
- break;
- }
+ if (l2tp_nl_tunnel_send_addr(skb, tunnel))
+ goto nla_put_failure;
-out:
genlmsg_end(skb, hdr);
return 0;
--
2.17.1
