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Message-Id: <20241031124550.20227-5-lulie@linux.alibaba.com>
Date: Thu, 31 Oct 2024 20:45:50 +0800
From: Philo Lu <lulie@...ux.alibaba.com>
To: netdev@...r.kernel.org
Cc: willemdebruijn.kernel@...il.com,
davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
dsahern@...nel.org,
horms@...nel.org,
antony.antony@...unet.com,
steffen.klassert@...unet.com,
linux-kernel@...r.kernel.org,
dust.li@...ux.alibaba.com,
jakub@...udflare.com,
fred.cc@...baba-inc.com,
yubing.qiuyubing@...baba-inc.com
Subject: [PATCH v6 net-next 4/4] ipv6/udp: Add 4-tuple hash for connected socket
Implement ipv6 udp hash4 like that in ipv4. The major difference is that
the hash value should be calculated with udp6_ehashfn(). Besides,
ipv4-mapped ipv6 address is handled before hash() and rehash().
Core procedures of hash/unhash/rehash are same as ipv4, and udpv4 and
udpv6 share the same udptable, so some functions in ipv4 hash4 can also
be shared.
Signed-off-by: Philo Lu <lulie@...ux.alibaba.com>
Signed-off-by: Cambda Zhu <cambda@...ux.alibaba.com>
Signed-off-by: Fred Chen <fred.cc@...baba-inc.com>
Signed-off-by: Yubing Qiu <yubing.qiuyubing@...baba-inc.com>
---
net/ipv6/udp.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 94 insertions(+), 2 deletions(-)
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 1ea99d704e31..64f13f258fca 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -110,8 +110,17 @@ void udp_v6_rehash(struct sock *sk)
u16 new_hash = ipv6_portaddr_hash(sock_net(sk),
&sk->sk_v6_rcv_saddr,
inet_sk(sk)->inet_num);
+ u16 new_hash4;
- udp_lib_rehash(sk, new_hash, 0); /* 4-tuple hash not implemented */
+ if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) {
+ new_hash4 = udp_ehashfn(sock_net(sk), sk->sk_rcv_saddr, sk->sk_num,
+ sk->sk_daddr, sk->sk_dport);
+ } else {
+ new_hash4 = udp6_ehashfn(sock_net(sk), &sk->sk_v6_rcv_saddr, sk->sk_num,
+ &sk->sk_v6_daddr, sk->sk_dport);
+ }
+
+ udp_lib_rehash(sk, new_hash, new_hash4);
}
static int compute_score(struct sock *sk, const struct net *net,
@@ -216,6 +225,71 @@ static struct sock *udp6_lib_lookup2(const struct net *net,
return result;
}
+#if IS_ENABLED(CONFIG_BASE_SMALL)
+static struct sock *udp6_lib_lookup4(const struct net *net,
+ const struct in6_addr *saddr, __be16 sport,
+ const struct in6_addr *daddr, unsigned int hnum,
+ int dif, int sdif, struct udp_table *udptable)
+{
+ return NULL;
+}
+
+static void udp6_hash4(struct sock *sk)
+{
+}
+#else /* !CONFIG_BASE_SMALL */
+static struct sock *udp6_lib_lookup4(const struct net *net,
+ const struct in6_addr *saddr, __be16 sport,
+ const struct in6_addr *daddr, unsigned int hnum,
+ int dif, int sdif, struct udp_table *udptable)
+{
+ const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
+ const struct hlist_nulls_node *node;
+ struct udp_hslot *hslot4;
+ unsigned int hash4, slot;
+ struct udp_sock *up;
+ struct sock *sk;
+
+ hash4 = udp6_ehashfn(net, daddr, hnum, saddr, sport);
+ slot = hash4 & udptable->mask;
+ hslot4 = &udptable->hash4[slot];
+
+begin:
+ udp_lrpa_for_each_entry_rcu(up, node, &hslot4->nulls_head) {
+ sk = (struct sock *)up;
+ if (inet6_match(net, sk, saddr, daddr, ports, dif, sdif))
+ return sk;
+ }
+
+ /* if the nulls value we got at the end of this lookup is not the expected one, we must
+ * restart lookup. We probably met an item that was moved to another chain due to rehash.
+ */
+ if (get_nulls_value(node) != slot)
+ goto begin;
+
+ return NULL;
+}
+
+static void udp6_hash4(struct sock *sk)
+{
+ struct net *net = sock_net(sk);
+ unsigned int hash;
+
+ if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) {
+ udp4_hash4(sk);
+ return;
+ }
+
+ if (sk_unhashed(sk) || ipv6_addr_any(&sk->sk_v6_rcv_saddr))
+ return;
+
+ hash = udp6_ehashfn(net, &sk->sk_v6_rcv_saddr, sk->sk_num,
+ &sk->sk_v6_daddr, sk->sk_dport);
+
+ udp_lib_hash4(sk, hash);
+}
+#endif /* CONFIG_BASE_SMALL */
+
/* rcu_read_lock() must be held */
struct sock *__udp6_lib_lookup(const struct net *net,
const struct in6_addr *saddr, __be16 sport,
@@ -231,6 +305,12 @@ struct sock *__udp6_lib_lookup(const struct net *net,
hash2 = ipv6_portaddr_hash(net, daddr, hnum);
hslot2 = udp_hashslot2(udptable, hash2);
+ if (udp_has_hash4(hslot2)) {
+ result = udp6_lib_lookup4(net, saddr, sport, daddr, hnum, dif, sdif, udptable);
+ if (result) /* udp6_lib_lookup4 return sk or NULL */
+ return result;
+ }
+
/* Lookup connected or non-wildcard sockets */
result = udp6_lib_lookup2(net, saddr, sport,
daddr, hnum, dif, sdif,
@@ -1166,6 +1246,18 @@ static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr, &addr_len);
}
+static int udpv6_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+{
+ int res;
+
+ lock_sock(sk);
+ res = __ip6_datagram_connect(sk, uaddr, addr_len);
+ if (!res)
+ udp6_hash4(sk);
+ release_sock(sk);
+ return res;
+}
+
/**
* udp6_hwcsum_outgoing - handle outgoing HW checksumming
* @sk: socket we are sending on
@@ -1761,7 +1853,7 @@ struct proto udpv6_prot = {
.owner = THIS_MODULE,
.close = udp_lib_close,
.pre_connect = udpv6_pre_connect,
- .connect = ip6_datagram_connect,
+ .connect = udpv6_connect,
.disconnect = udp_disconnect,
.ioctl = udp_ioctl,
.init = udpv6_init_sock,
--
2.32.0.3.g01195cf9f
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