The current implementation was extracted from inet[6]_lhash2_lookup in commit 80b373f74f9e ("inet: Extract helper for selecting socket from reuseport group") and commit 5df6531292b5 ("inet6: Extract helper for selecting socket from reuseport group"). In the original context, sk is always in TCP_LISTEN state and so did not have a separate check.
Add documentation that specifies which sk_state are valid to pass to the function.
Signed-off-by: Lorenz Bauer lmb@isovalent.com --- net/ipv4/inet_hashtables.c | 14 ++++++++++++++ net/ipv6/inet6_hashtables.c | 14 ++++++++++++++ 2 files changed, 28 insertions(+)
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c index 920131e4a65d..91f9210d4e83 100644 --- a/net/ipv4/inet_hashtables.c +++ b/net/ipv4/inet_hashtables.c @@ -332,6 +332,20 @@ static inline int compute_score(struct sock *sk, struct net *net, return score; }
+/** + * inet_lookup_reuseport() - execute reuseport logic on AF_INET socket if necessary. + * @net: network namespace. + * @sk: AF_INET socket, must be in TCP_LISTEN state for TCP or TCP_CLOSE for UDP. + * @skb: context for a potential SK_REUSEPORT program. + * @doff: header offset. + * @saddr: source address. + * @sport: source port. + * @daddr: destination address. + * @hnum: destination port in host byte order. + * + * Return: NULL if sk doesn't have SO_REUSEPORT set, otherwise a pointer to + * the selected sock or an error. + */ struct sock *inet_lookup_reuseport(struct net *net, struct sock *sk, struct sk_buff *skb, int doff, __be32 saddr, __be16 sport, diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c index b7c56867314e..208998694ae3 100644 --- a/net/ipv6/inet6_hashtables.c +++ b/net/ipv6/inet6_hashtables.c @@ -111,6 +111,20 @@ static inline int compute_score(struct sock *sk, struct net *net, return score; }
+/** + * inet6_lookup_reuseport() - execute reuseport logic on AF_INET6 socket if necessary. + * @net: network namespace. + * @sk: AF_INET6 socket, must be in TCP_LISTEN state for TCP or TCP_CLOSE for UDP. + * @skb: context for a potential SK_REUSEPORT program. + * @doff: header offset. + * @saddr: source address. + * @sport: source port. + * @daddr: destination address. + * @hnum: destination port in host byte order. + * + * Return: NULL if sk doesn't have SO_REUSEPORT set, otherwise a pointer to + * the selected sock or an error. + */ struct sock *inet6_lookup_reuseport(struct net *net, struct sock *sk, struct sk_buff *skb, int doff, const struct in6_addr *saddr,