From: Lorenz Bauer lmb@isovalent.com Date: Mon, 26 Jun 2023 16:09:00 +0100
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.
nit: " or TCP_CLOSE for UDP"
This part should be added in the next patch, or this patch should be 4th patch.
- @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,
-- 2.40.1