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authorPavel Begunkov <asml.silence@gmail.com>2023-05-19 15:30:36 +0200
committerDavid S. Miller <davem@davemloft.net>2023-05-22 12:22:58 +0200
commitfe79bd65c819cc520aa66de65caae8e4cea29c5a (patch)
tree33015363adb396d45edc5e721ab5938fef7be794 /net/ipv6/tcp_ipv6.c
parentnet: phy: add helpers for comparing phy IDs (diff)
downloadlinux-fe79bd65c819cc520aa66de65caae8e4cea29c5a.tar.xz
linux-fe79bd65c819cc520aa66de65caae8e4cea29c5a.zip
net/tcp: refactor tcp_inet6_sk()
Don't keep hand coded offset caluclations and replace it with container_of(). It should be type safer and a bit less confusing. It also makes it with a macro instead of inline function to preserve constness, which was previously casted out like in case of tcp_v6_send_synack(). Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Reviewed-by: Simon Horman <simon.horman@corigine.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/tcp_ipv6.c')
-rw-r--r--net/ipv6/tcp_ipv6.c10
1 files changed, 3 insertions, 7 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 7132eb213a7a..d657713d1c71 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -93,12 +93,8 @@ static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
* This avoids a dereference and allow compiler optimizations.
* It is a specialized version of inet6_sk_generic().
*/
-static struct ipv6_pinfo *tcp_inet6_sk(const struct sock *sk)
-{
- unsigned int offset = sizeof(struct tcp6_sock) - sizeof(struct ipv6_pinfo);
-
- return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
-}
+#define tcp_inet6_sk(sk) (&container_of_const(tcp_sk(sk), \
+ struct tcp6_sock, tcp)->inet6)
static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb)
{
@@ -533,7 +529,7 @@ static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
struct sk_buff *syn_skb)
{
struct inet_request_sock *ireq = inet_rsk(req);
- struct ipv6_pinfo *np = tcp_inet6_sk(sk);
+ const struct ipv6_pinfo *np = tcp_inet6_sk(sk);
struct ipv6_txoptions *opt;
struct flowi6 *fl6 = &fl->u.ip6;
struct sk_buff *skb;