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ipv6/udp: Add 4-tuple hash for connected socket

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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(). Export
udp_ehashfn because now we use it in udpv6 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.

Co-developed-by: Cambda Zhu <cambda@linux.alibaba.com>
Signed-off-by: Cambda Zhu <cambda@linux.alibaba.com>
Co-developed-by: Fred Chen <fred.cc@alibaba-inc.com>
Signed-off-by: Fred Chen <fred.cc@alibaba-inc.com>
Co-developed-by: Yubing Qiu <yubing.qiuyubing@alibaba-inc.com>
Signed-off-by: Yubing Qiu <yubing.qiuyubing@alibaba-inc.com>
Signed-off-by: Philo Lu <lulie@linux.alibaba.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Philo Lu 2024-11-14 18:52:07 +08:00 committed by David S. Miller
parent 78c91ae2c6
commit 1b29a730ef
3 changed files with 103 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/udp.h
View File

@ -303,6 +303,8 @@ static inline int udp_lib_hash(struct sock *sk)
void udp_lib_unhash(struct sock *sk);
void udp_lib_rehash(struct sock *sk, u16 new_hash, u16 new_hash4);
u32 udp_ehashfn(const struct net *net, const __be32 laddr, const __u16 lport,
const __be32 faddr, const __be16 fport);
static inline void udp_lib_close(struct sock *sk, long timeout)
{

2
net/ipv4/udp.c
View File

@ -410,7 +410,6 @@ static int compute_score(struct sock *sk, const struct net *net,
return score;
}
INDIRECT_CALLABLE_SCOPE
u32 udp_ehashfn(const struct net *net, const __be32 laddr, const __u16 lport,
const __be32 faddr, const __be16 fport)
{
@ -419,6 +418,7 @@ u32 udp_ehashfn(const struct net *net, const __be32 laddr, const __u16 lport,
return __inet_ehashfn(laddr, lport, faddr, fport,
udp_ehash_secret + net_hash_mix(net));
}
EXPORT_SYMBOL(udp_ehashfn);
/* called with rcu_read_lock() */
static struct sock *udp4_lib_lookup2(const struct net *net,

102
net/ipv6/udp.c
View File

@ -110,8 +110,19 @@ 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 +227,74 @@ rescore:
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 +310,13 @@ 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 +1252,18 @@ 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 +1859,7 @@ 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,