#include <trace/events/skb.h>
#include <net/busy_poll.h>
#include "udp_impl.h"
+#include <net/sock_reuseport.h>
struct udp_table udp_table __read_mostly;
EXPORT_SYMBOL(udp_table);
unsigned long *bitmap,
struct sock *sk,
int (*saddr_comp)(const struct sock *sk1,
- const struct sock *sk2),
+ const struct sock *sk2,
+ bool match_wildcard),
unsigned int log)
{
struct sock *sk2;
(!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
(!sk2->sk_reuseport || !sk->sk_reuseport ||
+ rcu_access_pointer(sk->sk_reuseport_cb) ||
!uid_eq(uid, sock_i_uid(sk2))) &&
- saddr_comp(sk, sk2)) {
+ saddr_comp(sk, sk2, true)) {
if (!bitmap)
return 1;
__set_bit(udp_sk(sk2)->udp_port_hash >> log, bitmap);
struct udp_hslot *hslot2,
struct sock *sk,
int (*saddr_comp)(const struct sock *sk1,
- const struct sock *sk2))
+ const struct sock *sk2,
+ bool match_wildcard))
{
struct sock *sk2;
struct hlist_nulls_node *node;
(!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
(!sk2->sk_reuseport || !sk->sk_reuseport ||
+ rcu_access_pointer(sk->sk_reuseport_cb) ||
!uid_eq(uid, sock_i_uid(sk2))) &&
- saddr_comp(sk, sk2)) {
+ saddr_comp(sk, sk2, true)) {
res = 1;
break;
}
return res;
}
+static int udp_reuseport_add_sock(struct sock *sk, struct udp_hslot *hslot,
+ int (*saddr_same)(const struct sock *sk1,
+ const struct sock *sk2,
+ bool match_wildcard))
+{
+ struct net *net = sock_net(sk);
+ struct hlist_nulls_node *node;
+ kuid_t uid = sock_i_uid(sk);
+ struct sock *sk2;
+
+ sk_nulls_for_each(sk2, node, &hslot->head) {
+ if (net_eq(sock_net(sk2), net) &&
+ sk2 != sk &&
+ sk2->sk_family == sk->sk_family &&
+ ipv6_only_sock(sk2) == ipv6_only_sock(sk) &&
+ (udp_sk(sk2)->udp_port_hash == udp_sk(sk)->udp_port_hash) &&
+ (sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
+ sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) &&
+ (*saddr_same)(sk, sk2, false)) {
+ return reuseport_add_sock(sk, sk2);
+ }
+ }
+
+ /* Initial allocation may have already happened via setsockopt */
+ if (!rcu_access_pointer(sk->sk_reuseport_cb))
+ return reuseport_alloc(sk);
+ return 0;
+}
+
/**
* udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6
*
*/
int udp_lib_get_port(struct sock *sk, unsigned short snum,
int (*saddr_comp)(const struct sock *sk1,
- const struct sock *sk2),
+ const struct sock *sk2,
+ bool match_wildcard),
unsigned int hash2_nulladdr)
{
struct udp_hslot *hslot, *hslot2;
udp_sk(sk)->udp_port_hash = snum;
udp_sk(sk)->udp_portaddr_hash ^= snum;
if (sk_unhashed(sk)) {
+ if (sk->sk_reuseport &&
+ udp_reuseport_add_sock(sk, hslot, saddr_comp)) {
+ inet_sk(sk)->inet_num = 0;
+ udp_sk(sk)->udp_port_hash = 0;
+ udp_sk(sk)->udp_portaddr_hash ^= snum;
+ goto fail_unlock;
+ }
+
sk_nulls_add_node_rcu(sk, &hslot->head);
hslot->count++;
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
}
EXPORT_SYMBOL(udp_lib_get_port);
-static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
+/* match_wildcard == true: 0.0.0.0 equals to any IPv4 addresses
+ * match_wildcard == false: addresses must be exactly the same, i.e.
+ * 0.0.0.0 only equals to 0.0.0.0
+ */
+static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2,
+ bool match_wildcard)
{
struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2);
- return (!ipv6_only_sock(sk2) &&
- (!inet1->inet_rcv_saddr || !inet2->inet_rcv_saddr ||
- inet1->inet_rcv_saddr == inet2->inet_rcv_saddr));
+ if (!ipv6_only_sock(sk2)) {
+ if (inet1->inet_rcv_saddr == inet2->inet_rcv_saddr)
+ return 1;
+ if (!inet1->inet_rcv_saddr || !inet2->inet_rcv_saddr)
+ return match_wildcard;
+ }
+ return 0;
}
static u32 udp4_portaddr_hash(const struct net *net, __be32 saddr,
badness = score;
reuseport = sk->sk_reuseport;
if (reuseport) {
+ struct sock *sk2;
hash = udp_ehashfn(net, daddr, hnum,
saddr, sport);
+ sk2 = reuseport_select_sock(sk, hash);
+ if (sk2) {
+ result = sk2;
+ goto found;
+ }
matches = 1;
}
} else if (score == badness && reuseport) {
if (get_nulls_value(node) != slot2)
goto begin;
if (result) {
+found:
if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
result = NULL;
else if (unlikely(compute_score2(result, net, saddr, sport,
badness = score;
reuseport = sk->sk_reuseport;
if (reuseport) {
+ struct sock *sk2;
hash = udp_ehashfn(net, daddr, hnum,
saddr, sport);
+ sk2 = reuseport_select_sock(sk, hash);
+ if (sk2) {
+ result = sk2;
+ goto found;
+ }
matches = 1;
}
} else if (score == badness && reuseport) {
goto begin;
if (result) {
+found:
if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
result = NULL;
else if (unlikely(compute_score(result, net, saddr, hnum, sport,
struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
__be32 daddr, __be16 dport, int dif)
{
- return __udp4_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
+ return __udp4_lib_lookup(net, saddr, sport, daddr, dport, dif,
+ &udp_table);
}
EXPORT_SYMBOL_GPL(udp4_lib_lookup);
hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
spin_lock_bh(&hslot->lock);
+ if (rcu_access_pointer(sk->sk_reuseport_cb))
+ reuseport_detach_sock(sk);
if (sk_nulls_del_node_init_rcu(sk)) {
hslot->count--;
inet_sk(sk)->inet_num = 0;
hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
nhslot2 = udp_hashslot2(udptable, newhash);
udp_sk(sk)->udp_portaddr_hash = newhash;
- if (hslot2 != nhslot2) {
+
+ if (hslot2 != nhslot2 ||
+ rcu_access_pointer(sk->sk_reuseport_cb)) {
hslot = udp_hashslot(udptable, sock_net(sk),
udp_sk(sk)->udp_port_hash);
/* we must lock primary chain too */
spin_lock_bh(&hslot->lock);
-
- spin_lock(&hslot2->lock);
- hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node);
- hslot2->count--;
- spin_unlock(&hslot2->lock);
-
- spin_lock(&nhslot2->lock);
- hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node,
- &nhslot2->head);
- nhslot2->count++;
- spin_unlock(&nhslot2->lock);
+ if (rcu_access_pointer(sk->sk_reuseport_cb))
+ reuseport_detach_sock(sk);
+
+ if (hslot2 != nhslot2) {
+ spin_lock(&hslot2->lock);
+ hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node);
+ hslot2->count--;
+ spin_unlock(&hslot2->lock);
+
+ spin_lock(&nhslot2->lock);
+ hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node,
+ &nhslot2->head);
+ nhslot2->count++;
+ spin_unlock(&nhslot2->lock);
+ }
spin_unlock_bh(&hslot->lock);
}
projects / cascardo / linux.git / blobdiff