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| author | Jakub Sitnicki <jakub@cloudflare.com> | 2020-07-17 12:35:30 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-07-17 20:18:17 -0700 |
| commit | 2a08748cd384cdfb8e1222bd3645a8d1d36e6a5d (patch) | |
| tree | c7b7d99213a9d3f2a0081581ee137513d1e8c514 /net/ipv6 | |
| parent | 72f7e9440e9bd06f855b21eba09c1017395f430a (diff) | |
| download | lwn-2a08748cd384cdfb8e1222bd3645a8d1d36e6a5d.tar.gz lwn-2a08748cd384cdfb8e1222bd3645a8d1d36e6a5d.zip | |
udp6: Extract helper for selecting socket from reuseport group
Prepare for calling into reuseport from __udp6_lib_lookup as well.
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200717103536.397595-10-jakub@cloudflare.com
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/udp.c | 37 |
1 files changed, 26 insertions, 11 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 38c0d9350c6b..084205c18a33 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -141,6 +141,27 @@ static int compute_score(struct sock *sk, struct net *net, return score; } +static inline struct sock *lookup_reuseport(struct net *net, struct sock *sk, + struct sk_buff *skb, + const struct in6_addr *saddr, + __be16 sport, + const struct in6_addr *daddr, + unsigned int hnum) +{ + struct sock *reuse_sk = NULL; + u32 hash; + + if (sk->sk_reuseport && sk->sk_state != TCP_ESTABLISHED) { + hash = udp6_ehashfn(net, daddr, hnum, saddr, sport); + reuse_sk = reuseport_select_sock(sk, hash, skb, + sizeof(struct udphdr)); + /* Fall back to scoring if group has connections */ + if (reuseport_has_conns(sk, false)) + return NULL; + } + return reuse_sk; +} + /* called with rcu_read_lock() */ static struct sock *udp6_lib_lookup2(struct net *net, const struct in6_addr *saddr, __be16 sport, @@ -150,7 +171,6 @@ static struct sock *udp6_lib_lookup2(struct net *net, { struct sock *sk, *result; int score, badness; - u32 hash = 0; result = NULL; badness = -1; @@ -158,16 +178,11 @@ static struct sock *udp6_lib_lookup2(struct net *net, score = compute_score(sk, net, saddr, sport, daddr, hnum, dif, sdif); if (score > badness) { - if (sk->sk_reuseport && - sk->sk_state != TCP_ESTABLISHED) { - hash = udp6_ehashfn(net, daddr, hnum, - saddr, sport); - - result = reuseport_select_sock(sk, hash, skb, - sizeof(struct udphdr)); - if (result && !reuseport_has_conns(sk, false)) - return result; - } + result = lookup_reuseport(net, sk, skb, + saddr, sport, daddr, hnum); + if (result) + return result; + result = sk; badness = score; } |