diff options
| author |   Jakub Sitnicki <jakub@cloudflare.com> | 2020-07-17 12:35:28 +0200 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2020-07-17 20:18:17 -0700 |
| commit | 7629c73a1466ec2348e9f64c874c19bf13f35f4c (patch) | |
| tree | 3b6fd51afd2845ad55d27c32d3ac644661dbe669 /net/ipv4 | |
| parent | inet6: Run SK_LOOKUP BPF program on socket lookup (diff) | |
| download | wireguard-linux-7629c73a1466ec2348e9f64c874c19bf13f35f4c.tar.xz wireguard-linux-7629c73a1466ec2348e9f64c874c19bf13f35f4c.zip | |
udp: Extract helper for selecting socket from reuseport group
Prepare for calling into reuseport from __udp4_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/20200717103536.397595-8-jakub@cloudflare.com
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/udp.c | 34 |
1 files changed, 24 insertions, 10 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 073d346f515c..9296faea3acf 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -408,6 +408,25 @@ static u32 udp_ehashfn(const struct net *net, const __be32 laddr, udp_ehash_secret + net_hash_mix(net)); } +static inline struct sock *lookup_reuseport(struct net *net, struct sock *sk, + struct sk_buff *skb, + __be32 saddr, __be16 sport, + __be32 daddr, unsigned short hnum) +{ + struct sock *reuse_sk = NULL; + u32 hash; + + if (sk->sk_reuseport && sk->sk_state != TCP_ESTABLISHED) { + hash = udp_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 *udp4_lib_lookup2(struct net *net, __be32 saddr, __be16 sport, @@ -418,7 +437,6 @@ static struct sock *udp4_lib_lookup2(struct net *net, { struct sock *sk, *result; int score, badness; - u32 hash = 0; result = NULL; badness = 0; @@ -426,15 +444,11 @@ static struct sock *udp4_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 = udp_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; + badness = score; result = sk; } |