^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * INET An implementation of the TCP/IP protocol suite for the LINUX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * operating system. INET is implemented using the BSD Socket
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * interface as the means of communication with the user level.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Generic INET transport hashtables
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Authors: Lotsa people, from code originally in tcp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/random.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <net/addrconf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <net/inet_connection_sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <net/inet_hashtables.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <net/inet6_hashtables.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <net/secure_seq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <net/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <net/tcp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <net/sock_reuseport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static u32 inet_ehashfn(const struct net *net, const __be32 laddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) const __u16 lport, const __be32 faddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) const __be16 fport)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static u32 inet_ehash_secret __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) net_get_random_once(&inet_ehash_secret, sizeof(inet_ehash_secret));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) return __inet_ehashfn(laddr, lport, faddr, fport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) inet_ehash_secret + net_hash_mix(net));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /* This function handles inet_sock, but also timewait and request sockets
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * for IPv4/IPv6.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static u32 sk_ehashfn(const struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (sk->sk_family == AF_INET6 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return inet6_ehashfn(sock_net(sk),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) &sk->sk_v6_rcv_saddr, sk->sk_num,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) &sk->sk_v6_daddr, sk->sk_dport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return inet_ehashfn(sock_net(sk),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) sk->sk_rcv_saddr, sk->sk_num,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) sk->sk_daddr, sk->sk_dport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * Allocate and initialize a new local port bind bucket.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * The bindhash mutex for snum's hash chain must be held here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct inet_bind_hashbucket *head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) const unsigned short snum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) int l3mdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (tb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) write_pnet(&tb->ib_net, net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) tb->l3mdev = l3mdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) tb->port = snum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) tb->fastreuse = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) tb->fastreuseport = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) INIT_HLIST_HEAD(&tb->owners);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) hlist_add_head(&tb->node, &head->chain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return tb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * Caller must hold hashbucket lock for this tb with local BH disabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (hlist_empty(&tb->owners)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) __hlist_del(&tb->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) kmem_cache_free(cachep, tb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) const unsigned short snum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) inet_sk(sk)->inet_num = snum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) sk_add_bind_node(sk, &tb->owners);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) inet_csk(sk)->icsk_bind_hash = tb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * Get rid of any references to a local port held by the given sock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static void __inet_put_port(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) const int bhash = inet_bhashfn(sock_net(sk), inet_sk(sk)->inet_num,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) hashinfo->bhash_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct inet_bind_bucket *tb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) spin_lock(&head->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) tb = inet_csk(sk)->icsk_bind_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) __sk_del_bind_node(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) inet_csk(sk)->icsk_bind_hash = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) inet_sk(sk)->inet_num = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) spin_unlock(&head->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) void inet_put_port(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) local_bh_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) __inet_put_port(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) local_bh_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) EXPORT_SYMBOL(inet_put_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) int __inet_inherit_port(const struct sock *sk, struct sock *child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) struct inet_hashinfo *table = sk->sk_prot->h.hashinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) unsigned short port = inet_sk(child)->inet_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) const int bhash = inet_bhashfn(sock_net(sk), port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) table->bhash_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) struct inet_bind_hashbucket *head = &table->bhash[bhash];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) struct inet_bind_bucket *tb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) int l3mdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) spin_lock(&head->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) tb = inet_csk(sk)->icsk_bind_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (unlikely(!tb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) spin_unlock(&head->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (tb->port != port) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) l3mdev = inet_sk_bound_l3mdev(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) /* NOTE: using tproxy and redirecting skbs to a proxy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) * on a different listener port breaks the assumption
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * that the listener socket's icsk_bind_hash is the same
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) * as that of the child socket. We have to look up or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * create a new bind bucket for the child here. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) inet_bind_bucket_for_each(tb, &head->chain) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (net_eq(ib_net(tb), sock_net(sk)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) tb->l3mdev == l3mdev && tb->port == port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (!tb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) tb = inet_bind_bucket_create(table->bind_bucket_cachep,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) sock_net(sk), head, port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) l3mdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) if (!tb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) spin_unlock(&head->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) inet_csk_update_fastreuse(tb, child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) inet_bind_hash(child, tb, port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) spin_unlock(&head->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) EXPORT_SYMBOL_GPL(__inet_inherit_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) static struct inet_listen_hashbucket *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) inet_lhash2_bucket_sk(struct inet_hashinfo *h, struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) u32 hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (sk->sk_family == AF_INET6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) hash = ipv6_portaddr_hash(sock_net(sk),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) &sk->sk_v6_rcv_saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) inet_sk(sk)->inet_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) hash = ipv4_portaddr_hash(sock_net(sk),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) inet_sk(sk)->inet_rcv_saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) inet_sk(sk)->inet_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) return inet_lhash2_bucket(h, hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static void inet_hash2(struct inet_hashinfo *h, struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) struct inet_listen_hashbucket *ilb2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) if (!h->lhash2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) ilb2 = inet_lhash2_bucket_sk(h, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) spin_lock(&ilb2->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) if (sk->sk_reuseport && sk->sk_family == AF_INET6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) hlist_add_tail_rcu(&inet_csk(sk)->icsk_listen_portaddr_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) &ilb2->head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) hlist_add_head_rcu(&inet_csk(sk)->icsk_listen_portaddr_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) &ilb2->head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) ilb2->count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) spin_unlock(&ilb2->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) static void inet_unhash2(struct inet_hashinfo *h, struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) struct inet_listen_hashbucket *ilb2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) if (!h->lhash2 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) WARN_ON_ONCE(hlist_unhashed(&inet_csk(sk)->icsk_listen_portaddr_node)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) ilb2 = inet_lhash2_bucket_sk(h, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) spin_lock(&ilb2->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) hlist_del_init_rcu(&inet_csk(sk)->icsk_listen_portaddr_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) ilb2->count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) spin_unlock(&ilb2->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static inline int compute_score(struct sock *sk, struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) const unsigned short hnum, const __be32 daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) const int dif, const int sdif)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) int score = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (net_eq(sock_net(sk), net) && sk->sk_num == hnum &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) !ipv6_only_sock(sk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) if (sk->sk_rcv_saddr != daddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) if (!inet_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) score = sk->sk_bound_dev_if ? 2 : 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) if (sk->sk_family == PF_INET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) score++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) score++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) return score;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static inline struct sock *lookup_reuseport(struct net *net, struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) struct sk_buff *skb, int doff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) __be32 saddr, __be16 sport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) __be32 daddr, unsigned short hnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) struct sock *reuse_sk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) u32 phash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (sk->sk_reuseport) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) phash = inet_ehashfn(net, daddr, hnum, saddr, sport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) reuse_sk = reuseport_select_sock(sk, phash, skb, doff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return reuse_sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) * Here are some nice properties to exploit here. The BSD API
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) * does not allow a listening sock to specify the remote port nor the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) * remote address for the connection. So always assume those are both
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) * wildcarded during the search since they can never be otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) /* called with rcu_read_lock() : No refcount taken on the socket */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static struct sock *inet_lhash2_lookup(struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) struct inet_listen_hashbucket *ilb2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) struct sk_buff *skb, int doff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) const __be32 saddr, __be16 sport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) const __be32 daddr, const unsigned short hnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) const int dif, const int sdif)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) struct inet_connection_sock *icsk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) struct sock *sk, *result = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) int score, hiscore = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) inet_lhash2_for_each_icsk_rcu(icsk, &ilb2->head) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) sk = (struct sock *)icsk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) score = compute_score(sk, net, hnum, daddr, dif, sdif);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) if (score > hiscore) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) result = lookup_reuseport(net, sk, skb, doff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) saddr, sport, daddr, hnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) if (result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) result = sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) hiscore = score;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) static inline struct sock *inet_lookup_run_bpf(struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) struct inet_hashinfo *hashinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) struct sk_buff *skb, int doff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) __be32 saddr, __be16 sport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) __be32 daddr, u16 hnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) struct sock *sk, *reuse_sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) bool no_reuseport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) if (hashinfo != &tcp_hashinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) return NULL; /* only TCP is supported */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) no_reuseport = bpf_sk_lookup_run_v4(net, IPPROTO_TCP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) saddr, sport, daddr, hnum, &sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (no_reuseport || IS_ERR_OR_NULL(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) return sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) reuse_sk = lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) if (reuse_sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) sk = reuse_sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) return sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) struct sock *__inet_lookup_listener(struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) struct inet_hashinfo *hashinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) struct sk_buff *skb, int doff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) const __be32 saddr, __be16 sport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) const __be32 daddr, const unsigned short hnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) const int dif, const int sdif)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) struct inet_listen_hashbucket *ilb2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) struct sock *result = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) unsigned int hash2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) /* Lookup redirect from BPF */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) result = inet_lookup_run_bpf(net, hashinfo, skb, doff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) saddr, sport, daddr, hnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) if (result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) hash2 = ipv4_portaddr_hash(net, daddr, hnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) ilb2 = inet_lhash2_bucket(hashinfo, hash2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) result = inet_lhash2_lookup(net, ilb2, skb, doff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) saddr, sport, daddr, hnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) dif, sdif);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) if (result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) /* Lookup lhash2 with INADDR_ANY */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) hash2 = ipv4_portaddr_hash(net, htonl(INADDR_ANY), hnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) ilb2 = inet_lhash2_bucket(hashinfo, hash2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) result = inet_lhash2_lookup(net, ilb2, skb, doff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) saddr, sport, htonl(INADDR_ANY), hnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) dif, sdif);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) if (IS_ERR(result))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) EXPORT_SYMBOL_GPL(__inet_lookup_listener);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) /* All sockets share common refcount, but have different destructors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) void sock_gen_put(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) if (!refcount_dec_and_test(&sk->sk_refcnt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) if (sk->sk_state == TCP_TIME_WAIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) inet_twsk_free(inet_twsk(sk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) else if (sk->sk_state == TCP_NEW_SYN_RECV)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) reqsk_free(inet_reqsk(sk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) sk_free(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) EXPORT_SYMBOL_GPL(sock_gen_put);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) void sock_edemux(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) sock_gen_put(skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) EXPORT_SYMBOL(sock_edemux);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) struct sock *__inet_lookup_established(struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) struct inet_hashinfo *hashinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) const __be32 saddr, const __be16 sport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) const __be32 daddr, const u16 hnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) const int dif, const int sdif)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) INET_ADDR_COOKIE(acookie, saddr, daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) struct sock *sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) const struct hlist_nulls_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) /* Optimize here for direct hit, only listening connections can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) * have wildcards anyways.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) unsigned int hash = inet_ehashfn(net, daddr, hnum, saddr, sport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) unsigned int slot = hash & hashinfo->ehash_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) begin:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) sk_nulls_for_each_rcu(sk, node, &head->chain) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) if (sk->sk_hash != hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) if (likely(INET_MATCH(sk, net, acookie,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) saddr, daddr, ports, dif, sdif))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) if (unlikely(!INET_MATCH(sk, net, acookie,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) saddr, daddr, ports,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) dif, sdif))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) sock_gen_put(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) goto begin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) * if the nulls value we got at the end of this lookup is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) * not the expected one, we must restart lookup.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) * We probably met an item that was moved to another chain.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) if (get_nulls_value(node) != slot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) goto begin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) sk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) found:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) return sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) EXPORT_SYMBOL_GPL(__inet_lookup_established);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) /* called with local bh disabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) static int __inet_check_established(struct inet_timewait_death_row *death_row,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) struct sock *sk, __u16 lport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) struct inet_timewait_sock **twp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) struct inet_hashinfo *hinfo = death_row->hashinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) struct inet_sock *inet = inet_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) __be32 daddr = inet->inet_rcv_saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) __be32 saddr = inet->inet_daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) int dif = sk->sk_bound_dev_if;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) struct net *net = sock_net(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) int sdif = l3mdev_master_ifindex_by_index(net, dif);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) INET_ADDR_COOKIE(acookie, saddr, daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) unsigned int hash = inet_ehashfn(net, daddr, lport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) saddr, inet->inet_dport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) struct sock *sk2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) const struct hlist_nulls_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) struct inet_timewait_sock *tw = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) spin_lock(lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) sk_nulls_for_each(sk2, node, &head->chain) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) if (sk2->sk_hash != hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (likely(INET_MATCH(sk2, net, acookie,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) saddr, daddr, ports, dif, sdif))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) if (sk2->sk_state == TCP_TIME_WAIT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) tw = inet_twsk(sk2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) if (twsk_unique(sk, sk2, twp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) goto not_unique;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) /* Must record num and sport now. Otherwise we will see
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) * in hash table socket with a funny identity.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) inet->inet_num = lport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) inet->inet_sport = htons(lport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) sk->sk_hash = hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) WARN_ON(!sk_unhashed(sk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) __sk_nulls_add_node_rcu(sk, &head->chain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) if (tw) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) sk_nulls_del_node_init_rcu((struct sock *)tw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) __NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) spin_unlock(lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) if (twp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) *twp = tw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) } else if (tw) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) /* Silly. Should hash-dance instead... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) inet_twsk_deschedule_put(tw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) not_unique:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) spin_unlock(lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) return -EADDRNOTAVAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) static u32 inet_sk_port_offset(const struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) const struct inet_sock *inet = inet_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) return secure_ipv4_port_ephemeral(inet->inet_rcv_saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) inet->inet_daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) inet->inet_dport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) /* Searches for an exsiting socket in the ehash bucket list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) * Returns true if found, false otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) static bool inet_ehash_lookup_by_sk(struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) struct hlist_nulls_head *list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) const __portpair ports = INET_COMBINED_PORTS(sk->sk_dport, sk->sk_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) const int sdif = sk->sk_bound_dev_if;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) const int dif = sk->sk_bound_dev_if;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) const struct hlist_nulls_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) struct net *net = sock_net(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) struct sock *esk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) INET_ADDR_COOKIE(acookie, sk->sk_daddr, sk->sk_rcv_saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) sk_nulls_for_each_rcu(esk, node, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) if (esk->sk_hash != sk->sk_hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) if (sk->sk_family == AF_INET) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) if (unlikely(INET_MATCH(esk, net, acookie,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) sk->sk_daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) sk->sk_rcv_saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) ports, dif, sdif))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) else if (sk->sk_family == AF_INET6) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) if (unlikely(INET6_MATCH(esk, net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) &sk->sk_v6_daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) &sk->sk_v6_rcv_saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) ports, dif, sdif))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) /* Insert a socket into ehash, and eventually remove another one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) * (The another one can be a SYN_RECV or TIMEWAIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) * If an existing socket already exists, socket sk is not inserted,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) * and sets found_dup_sk parameter to true.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) bool inet_ehash_insert(struct sock *sk, struct sock *osk, bool *found_dup_sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) struct hlist_nulls_head *list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) struct inet_ehash_bucket *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) spinlock_t *lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) bool ret = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) WARN_ON_ONCE(!sk_unhashed(sk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) sk->sk_hash = sk_ehashfn(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) head = inet_ehash_bucket(hashinfo, sk->sk_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) list = &head->chain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) spin_lock(lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) if (osk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) WARN_ON_ONCE(sk->sk_hash != osk->sk_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) ret = sk_nulls_del_node_init_rcu(osk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) } else if (found_dup_sk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) *found_dup_sk = inet_ehash_lookup_by_sk(sk, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) if (*found_dup_sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) ret = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) __sk_nulls_add_node_rcu(sk, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) spin_unlock(lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) bool inet_ehash_nolisten(struct sock *sk, struct sock *osk, bool *found_dup_sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) bool ok = inet_ehash_insert(sk, osk, found_dup_sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) if (ok) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) percpu_counter_inc(sk->sk_prot->orphan_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) inet_sk_set_state(sk, TCP_CLOSE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) sock_set_flag(sk, SOCK_DEAD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) inet_csk_destroy_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) return ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) EXPORT_SYMBOL_GPL(inet_ehash_nolisten);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) static int inet_reuseport_add_sock(struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) struct inet_listen_hashbucket *ilb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) struct inet_bind_bucket *tb = inet_csk(sk)->icsk_bind_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) const struct hlist_nulls_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) struct sock *sk2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) kuid_t uid = sock_i_uid(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) sk_nulls_for_each_rcu(sk2, node, &ilb->nulls_head) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) if (sk2 != sk &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) sk2->sk_family == sk->sk_family &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) ipv6_only_sock(sk2) == ipv6_only_sock(sk) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) sk2->sk_bound_dev_if == sk->sk_bound_dev_if &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) inet_csk(sk2)->icsk_bind_hash == tb &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) inet_rcv_saddr_equal(sk, sk2, false))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) return reuseport_add_sock(sk, sk2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) inet_rcv_saddr_any(sk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) return reuseport_alloc(sk, inet_rcv_saddr_any(sk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) int __inet_hash(struct sock *sk, struct sock *osk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) struct inet_listen_hashbucket *ilb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) if (sk->sk_state != TCP_LISTEN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) inet_ehash_nolisten(sk, osk, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) WARN_ON(!sk_unhashed(sk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) spin_lock(&ilb->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) if (sk->sk_reuseport) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) err = inet_reuseport_add_sock(sk, ilb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) sk->sk_family == AF_INET6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) __sk_nulls_add_node_tail_rcu(sk, &ilb->nulls_head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) __sk_nulls_add_node_rcu(sk, &ilb->nulls_head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) inet_hash2(hashinfo, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) ilb->count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) sock_set_flag(sk, SOCK_RCU_FREE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) spin_unlock(&ilb->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) EXPORT_SYMBOL(__inet_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) int inet_hash(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) if (sk->sk_state != TCP_CLOSE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) local_bh_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) err = __inet_hash(sk, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) local_bh_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) EXPORT_SYMBOL_GPL(inet_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) void inet_unhash(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) struct inet_listen_hashbucket *ilb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) spinlock_t *lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) if (sk_unhashed(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) if (sk->sk_state == TCP_LISTEN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) lock = &ilb->lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) spin_lock_bh(lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) if (sk_unhashed(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) if (rcu_access_pointer(sk->sk_reuseport_cb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) reuseport_detach_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) if (ilb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) inet_unhash2(hashinfo, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) ilb->count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) __sk_nulls_del_node_init_rcu(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) spin_unlock_bh(lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) EXPORT_SYMBOL_GPL(inet_unhash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) int __inet_hash_connect(struct inet_timewait_death_row *death_row,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) struct sock *sk, u32 port_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) int (*check_established)(struct inet_timewait_death_row *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) struct sock *, __u16, struct inet_timewait_sock **))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) struct inet_hashinfo *hinfo = death_row->hashinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) struct inet_timewait_sock *tw = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) struct inet_bind_hashbucket *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) int port = inet_sk(sk)->inet_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) struct net *net = sock_net(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) struct inet_bind_bucket *tb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) u32 remaining, offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) int ret, i, low, high;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) static u32 hint;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) int l3mdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) if (port) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) head = &hinfo->bhash[inet_bhashfn(net, port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) hinfo->bhash_size)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) tb = inet_csk(sk)->icsk_bind_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) spin_lock_bh(&head->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) inet_ehash_nolisten(sk, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) spin_unlock_bh(&head->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) spin_unlock(&head->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) /* No definite answer... Walk to established hash table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) ret = check_established(death_row, sk, port, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) local_bh_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) l3mdev = inet_sk_bound_l3mdev(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) inet_get_local_port_range(net, &low, &high);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) high++; /* [32768, 60999] -> [32768, 61000[ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) remaining = high - low;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) if (likely(remaining > 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) remaining &= ~1U;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) offset = (hint + port_offset) % remaining;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) /* In first pass we try ports of @low parity.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) * inet_csk_get_port() does the opposite choice.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) offset &= ~1U;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) other_parity_scan:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) port = low + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) for (i = 0; i < remaining; i += 2, port += 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) if (unlikely(port >= high))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) port -= remaining;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) if (inet_is_local_reserved_port(net, port))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) head = &hinfo->bhash[inet_bhashfn(net, port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) hinfo->bhash_size)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) spin_lock_bh(&head->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) /* Does not bother with rcv_saddr checks, because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) * the established check is already unique enough.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) inet_bind_bucket_for_each(tb, &head->chain) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) if (net_eq(ib_net(tb), net) && tb->l3mdev == l3mdev &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) tb->port == port) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) if (tb->fastreuse >= 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) tb->fastreuseport >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) goto next_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) WARN_ON(hlist_empty(&tb->owners));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) if (!check_established(death_row, sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) port, &tw))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) goto ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) goto next_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) net, head, port, l3mdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) if (!tb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) spin_unlock_bh(&head->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) tb->fastreuse = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) tb->fastreuseport = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) goto ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) next_port:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) spin_unlock_bh(&head->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) offset++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) if ((offset & 1) && remaining > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) goto other_parity_scan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) return -EADDRNOTAVAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) ok:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) hint += i + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) /* Head lock still held and bh's disabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) inet_bind_hash(sk, tb, port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) if (sk_unhashed(sk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) inet_sk(sk)->inet_sport = htons(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) inet_ehash_nolisten(sk, (struct sock *)tw, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) if (tw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) inet_twsk_bind_unhash(tw, hinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) spin_unlock(&head->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) if (tw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) inet_twsk_deschedule_put(tw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) local_bh_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) * Bind a port for a connect operation and hash it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) int inet_hash_connect(struct inet_timewait_death_row *death_row,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) u32 port_offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) if (!inet_sk(sk)->inet_num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) port_offset = inet_sk_port_offset(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) return __inet_hash_connect(death_row, sk, port_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) __inet_check_established);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) EXPORT_SYMBOL_GPL(inet_hash_connect);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) void inet_hashinfo_init(struct inet_hashinfo *h)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) for (i = 0; i < INET_LHTABLE_SIZE; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) spin_lock_init(&h->listening_hash[i].lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) INIT_HLIST_NULLS_HEAD(&h->listening_hash[i].nulls_head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) i + LISTENING_NULLS_BASE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) h->listening_hash[i].count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) h->lhash2 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) EXPORT_SYMBOL_GPL(inet_hashinfo_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) static void init_hashinfo_lhash2(struct inet_hashinfo *h)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) for (i = 0; i <= h->lhash2_mask; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) spin_lock_init(&h->lhash2[i].lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) INIT_HLIST_HEAD(&h->lhash2[i].head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) h->lhash2[i].count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) void __init inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) unsigned long numentries, int scale,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) unsigned long low_limit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) unsigned long high_limit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) h->lhash2 = alloc_large_system_hash(name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) sizeof(*h->lhash2),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) numentries,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) scale,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) &h->lhash2_mask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) low_limit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) high_limit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) init_hashinfo_lhash2(h);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) int inet_hashinfo2_init_mod(struct inet_hashinfo *h)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) h->lhash2 = kmalloc_array(INET_LHTABLE_SIZE, sizeof(*h->lhash2), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) if (!h->lhash2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) h->lhash2_mask = INET_LHTABLE_SIZE - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) /* INET_LHTABLE_SIZE must be a power of 2 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) BUG_ON(INET_LHTABLE_SIZE & h->lhash2_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) init_hashinfo_lhash2(h);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) EXPORT_SYMBOL_GPL(inet_hashinfo2_init_mod);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) unsigned int locksz = sizeof(spinlock_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) unsigned int i, nblocks = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) if (locksz != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) /* allocate 2 cache lines or at least one spinlock per cpu */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) nblocks = max(2U * L1_CACHE_BYTES / locksz, 1U);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) nblocks = roundup_pow_of_two(nblocks * num_possible_cpus());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) /* no more locks than number of hash buckets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) nblocks = min(nblocks, hashinfo->ehash_mask + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) hashinfo->ehash_locks = kvmalloc_array(nblocks, locksz, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) if (!hashinfo->ehash_locks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) for (i = 0; i < nblocks; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) spin_lock_init(&hashinfo->ehash_locks[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) hashinfo->ehash_locks_mask = nblocks - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) EXPORT_SYMBOL_GPL(inet_ehash_locks_alloc);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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