diff options
| author | Lorenz Bauer <lmb@isovalent.com> | 2023-07-20 17:30:09 +0200 |
|---|---|---|
| committer | Martin KaFai Lau <martin.lau@kernel.org> | 2023-07-25 13:51:44 -0700 |
| commit | 2a61776366bd17db9ac8c93ec32b8e0ae6b11cf2 (patch) | |
| tree | 4dc38ce92aca7bb43d3fe001d5e85dd80357510d /net/ipv4/inet_hashtables.c | |
| parent | 0f495f7617229772403e683033abc473f0f0553c (diff) | |
net: document inet[6]_lookup_reuseport sk_state requirements
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.
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
Link: https://lore.kernel.org/r/20230720-so-reuseport-v6-5-7021b683cdae@isovalent.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Diffstat (limited to 'net/ipv4/inet_hashtables.c')
| -rw-r--r-- | net/ipv4/inet_hashtables.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c index 0a7a726464d9..e9cec4807694 100644 --- a/net/ipv4/inet_hashtables.c +++ b/net/ipv4/inet_hashtables.c @@ -335,6 +335,21 @@ static inline int compute_score(struct sock *sk, struct net *net, INDIRECT_CALLABLE_DECLARE(inet_ehashfn_t udp_ehashfn); +/** + * 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. + * @ehashfn: hash function used to generate the fallback hash. + * + * 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, |