summaryrefslogtreecommitdiffstats
path: root/net/ipv4/inet_hashtables.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /net/ipv4/inet_hashtables.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/ipv4/inet_hashtables.c')
-rw-r--r--net/ipv4/inet_hashtables.c1277
1 files changed, 1277 insertions, 0 deletions
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
new file mode 100644
index 0000000000..a532f749e4
--- /dev/null
+++ b/net/ipv4/inet_hashtables.c
@@ -0,0 +1,1277 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * Generic INET transport hashtables
+ *
+ * Authors: Lotsa people, from code originally in tcp
+ */
+
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/wait.h>
+#include <linux/vmalloc.h>
+#include <linux/memblock.h>
+
+#include <net/addrconf.h>
+#include <net/inet_connection_sock.h>
+#include <net/inet_hashtables.h>
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/inet6_hashtables.h>
+#endif
+#include <net/secure_seq.h>
+#include <net/ip.h>
+#include <net/tcp.h>
+#include <net/sock_reuseport.h>
+
+u32 inet_ehashfn(const struct net *net, const __be32 laddr,
+ const __u16 lport, const __be32 faddr,
+ const __be16 fport)
+{
+ static u32 inet_ehash_secret __read_mostly;
+
+ net_get_random_once(&inet_ehash_secret, sizeof(inet_ehash_secret));
+
+ return __inet_ehashfn(laddr, lport, faddr, fport,
+ inet_ehash_secret + net_hash_mix(net));
+}
+EXPORT_SYMBOL_GPL(inet_ehashfn);
+
+/* This function handles inet_sock, but also timewait and request sockets
+ * for IPv4/IPv6.
+ */
+static u32 sk_ehashfn(const struct sock *sk)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+ if (sk->sk_family == AF_INET6 &&
+ !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
+ return inet6_ehashfn(sock_net(sk),
+ &sk->sk_v6_rcv_saddr, sk->sk_num,
+ &sk->sk_v6_daddr, sk->sk_dport);
+#endif
+ return inet_ehashfn(sock_net(sk),
+ sk->sk_rcv_saddr, sk->sk_num,
+ sk->sk_daddr, sk->sk_dport);
+}
+
+/*
+ * Allocate and initialize a new local port bind bucket.
+ * The bindhash mutex for snum's hash chain must be held here.
+ */
+struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
+ struct net *net,
+ struct inet_bind_hashbucket *head,
+ const unsigned short snum,
+ int l3mdev)
+{
+ struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
+
+ if (tb) {
+ write_pnet(&tb->ib_net, net);
+ tb->l3mdev = l3mdev;
+ tb->port = snum;
+ tb->fastreuse = 0;
+ tb->fastreuseport = 0;
+ INIT_HLIST_HEAD(&tb->owners);
+ hlist_add_head(&tb->node, &head->chain);
+ }
+ return tb;
+}
+
+/*
+ * Caller must hold hashbucket lock for this tb with local BH disabled
+ */
+void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb)
+{
+ if (hlist_empty(&tb->owners)) {
+ __hlist_del(&tb->node);
+ kmem_cache_free(cachep, tb);
+ }
+}
+
+bool inet_bind_bucket_match(const struct inet_bind_bucket *tb, const struct net *net,
+ unsigned short port, int l3mdev)
+{
+ return net_eq(ib_net(tb), net) && tb->port == port &&
+ tb->l3mdev == l3mdev;
+}
+
+static void inet_bind2_bucket_init(struct inet_bind2_bucket *tb,
+ struct net *net,
+ struct inet_bind_hashbucket *head,
+ unsigned short port, int l3mdev,
+ const struct sock *sk)
+{
+ write_pnet(&tb->ib_net, net);
+ tb->l3mdev = l3mdev;
+ tb->port = port;
+#if IS_ENABLED(CONFIG_IPV6)
+ tb->family = sk->sk_family;
+ if (sk->sk_family == AF_INET6)
+ tb->v6_rcv_saddr = sk->sk_v6_rcv_saddr;
+ else
+#endif
+ tb->rcv_saddr = sk->sk_rcv_saddr;
+ INIT_HLIST_HEAD(&tb->owners);
+ INIT_HLIST_HEAD(&tb->deathrow);
+ hlist_add_head(&tb->node, &head->chain);
+}
+
+struct inet_bind2_bucket *inet_bind2_bucket_create(struct kmem_cache *cachep,
+ struct net *net,
+ struct inet_bind_hashbucket *head,
+ unsigned short port,
+ int l3mdev,
+ const struct sock *sk)
+{
+ struct inet_bind2_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
+
+ if (tb)
+ inet_bind2_bucket_init(tb, net, head, port, l3mdev, sk);
+
+ return tb;
+}
+
+/* Caller must hold hashbucket lock for this tb with local BH disabled */
+void inet_bind2_bucket_destroy(struct kmem_cache *cachep, struct inet_bind2_bucket *tb)
+{
+ if (hlist_empty(&tb->owners) && hlist_empty(&tb->deathrow)) {
+ __hlist_del(&tb->node);
+ kmem_cache_free(cachep, tb);
+ }
+}
+
+static bool inet_bind2_bucket_addr_match(const struct inet_bind2_bucket *tb2,
+ const struct sock *sk)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+ if (sk->sk_family != tb2->family) {
+ if (sk->sk_family == AF_INET)
+ return ipv6_addr_v4mapped(&tb2->v6_rcv_saddr) &&
+ tb2->v6_rcv_saddr.s6_addr32[3] == sk->sk_rcv_saddr;
+
+ return ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr) &&
+ sk->sk_v6_rcv_saddr.s6_addr32[3] == tb2->rcv_saddr;
+ }
+
+ if (sk->sk_family == AF_INET6)
+ return ipv6_addr_equal(&tb2->v6_rcv_saddr,
+ &sk->sk_v6_rcv_saddr);
+#endif
+ return tb2->rcv_saddr == sk->sk_rcv_saddr;
+}
+
+void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
+ struct inet_bind2_bucket *tb2, unsigned short port)
+{
+ inet_sk(sk)->inet_num = port;
+ sk_add_bind_node(sk, &tb->owners);
+ inet_csk(sk)->icsk_bind_hash = tb;
+ sk_add_bind2_node(sk, &tb2->owners);
+ inet_csk(sk)->icsk_bind2_hash = tb2;
+}
+
+/*
+ * Get rid of any references to a local port held by the given sock.
+ */
+static void __inet_put_port(struct sock *sk)
+{
+ struct inet_hashinfo *hashinfo = tcp_or_dccp_get_hashinfo(sk);
+ struct inet_bind_hashbucket *head, *head2;
+ struct net *net = sock_net(sk);
+ struct inet_bind_bucket *tb;
+ int bhash;
+
+ bhash = inet_bhashfn(net, inet_sk(sk)->inet_num, hashinfo->bhash_size);
+ head = &hashinfo->bhash[bhash];
+ head2 = inet_bhashfn_portaddr(hashinfo, sk, net, inet_sk(sk)->inet_num);
+
+ spin_lock(&head->lock);
+ tb = inet_csk(sk)->icsk_bind_hash;
+ __sk_del_bind_node(sk);
+ inet_csk(sk)->icsk_bind_hash = NULL;
+ inet_sk(sk)->inet_num = 0;
+ inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
+
+ spin_lock(&head2->lock);
+ if (inet_csk(sk)->icsk_bind2_hash) {
+ struct inet_bind2_bucket *tb2 = inet_csk(sk)->icsk_bind2_hash;
+
+ __sk_del_bind2_node(sk);
+ inet_csk(sk)->icsk_bind2_hash = NULL;
+ inet_bind2_bucket_destroy(hashinfo->bind2_bucket_cachep, tb2);
+ }
+ spin_unlock(&head2->lock);
+
+ spin_unlock(&head->lock);
+}
+
+void inet_put_port(struct sock *sk)
+{
+ local_bh_disable();
+ __inet_put_port(sk);
+ local_bh_enable();
+}
+EXPORT_SYMBOL(inet_put_port);
+
+int __inet_inherit_port(const struct sock *sk, struct sock *child)
+{
+ struct inet_hashinfo *table = tcp_or_dccp_get_hashinfo(sk);
+ unsigned short port = inet_sk(child)->inet_num;
+ struct inet_bind_hashbucket *head, *head2;
+ bool created_inet_bind_bucket = false;
+ struct net *net = sock_net(sk);
+ bool update_fastreuse = false;
+ struct inet_bind2_bucket *tb2;
+ struct inet_bind_bucket *tb;
+ int bhash, l3mdev;
+
+ bhash = inet_bhashfn(net, port, table->bhash_size);
+ head = &table->bhash[bhash];
+ head2 = inet_bhashfn_portaddr(table, child, net, port);
+
+ spin_lock(&head->lock);
+ spin_lock(&head2->lock);
+ tb = inet_csk(sk)->icsk_bind_hash;
+ tb2 = inet_csk(sk)->icsk_bind2_hash;
+ if (unlikely(!tb || !tb2)) {
+ spin_unlock(&head2->lock);
+ spin_unlock(&head->lock);
+ return -ENOENT;
+ }
+ if (tb->port != port) {
+ l3mdev = inet_sk_bound_l3mdev(sk);
+
+ /* NOTE: using tproxy and redirecting skbs to a proxy
+ * on a different listener port breaks the assumption
+ * that the listener socket's icsk_bind_hash is the same
+ * as that of the child socket. We have to look up or
+ * create a new bind bucket for the child here. */
+ inet_bind_bucket_for_each(tb, &head->chain) {
+ if (inet_bind_bucket_match(tb, net, port, l3mdev))
+ break;
+ }
+ if (!tb) {
+ tb = inet_bind_bucket_create(table->bind_bucket_cachep,
+ net, head, port, l3mdev);
+ if (!tb) {
+ spin_unlock(&head2->lock);
+ spin_unlock(&head->lock);
+ return -ENOMEM;
+ }
+ created_inet_bind_bucket = true;
+ }
+ update_fastreuse = true;
+
+ goto bhash2_find;
+ } else if (!inet_bind2_bucket_addr_match(tb2, child)) {
+ l3mdev = inet_sk_bound_l3mdev(sk);
+
+bhash2_find:
+ tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, child);
+ if (!tb2) {
+ tb2 = inet_bind2_bucket_create(table->bind2_bucket_cachep,
+ net, head2, port,
+ l3mdev, child);
+ if (!tb2)
+ goto error;
+ }
+ }
+ if (update_fastreuse)
+ inet_csk_update_fastreuse(tb, child);
+ inet_bind_hash(child, tb, tb2, port);
+ spin_unlock(&head2->lock);
+ spin_unlock(&head->lock);
+
+ return 0;
+
+error:
+ if (created_inet_bind_bucket)
+ inet_bind_bucket_destroy(table->bind_bucket_cachep, tb);
+ spin_unlock(&head2->lock);
+ spin_unlock(&head->lock);
+ return -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(__inet_inherit_port);
+
+static struct inet_listen_hashbucket *
+inet_lhash2_bucket_sk(struct inet_hashinfo *h, struct sock *sk)
+{
+ u32 hash;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (sk->sk_family == AF_INET6)
+ hash = ipv6_portaddr_hash(sock_net(sk),
+ &sk->sk_v6_rcv_saddr,
+ inet_sk(sk)->inet_num);
+ else
+#endif
+ hash = ipv4_portaddr_hash(sock_net(sk),
+ inet_sk(sk)->inet_rcv_saddr,
+ inet_sk(sk)->inet_num);
+ return inet_lhash2_bucket(h, hash);
+}
+
+static inline int compute_score(struct sock *sk, struct net *net,
+ const unsigned short hnum, const __be32 daddr,
+ const int dif, const int sdif)
+{
+ int score = -1;
+
+ if (net_eq(sock_net(sk), net) && sk->sk_num == hnum &&
+ !ipv6_only_sock(sk)) {
+ if (sk->sk_rcv_saddr != daddr)
+ return -1;
+
+ if (!inet_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif))
+ return -1;
+ score = sk->sk_bound_dev_if ? 2 : 1;
+
+ if (sk->sk_family == PF_INET)
+ score++;
+ if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
+ score++;
+ }
+ return score;
+}
+
+/**
+ * inet_lookup_reuseport() - execute reuseport logic on AF_INET socket if necessary.
+ * @net: network namespace.
+ * @sk: AF_INET socket, must be in TCP_LISTEN state for TCP or TCP_CLOSE for UDP.
+ * @skb: context for a potential SK_REUSEPORT program.
+ * @doff: header offset.
+ * @saddr: source address.
+ * @sport: source port.
+ * @daddr: destination address.
+ * @hnum: destination port in host byte order.
+ * @ehashfn: hash function used to generate the fallback hash.
+ *
+ * Return: NULL if sk doesn't have SO_REUSEPORT set, otherwise a pointer to
+ * the selected sock or an error.
+ */
+struct sock *inet_lookup_reuseport(struct net *net, struct sock *sk,
+ struct sk_buff *skb, int doff,
+ __be32 saddr, __be16 sport,
+ __be32 daddr, unsigned short hnum,
+ inet_ehashfn_t *ehashfn)
+{
+ struct sock *reuse_sk = NULL;
+ u32 phash;
+
+ if (sk->sk_reuseport) {
+ phash = INDIRECT_CALL_2(ehashfn, udp_ehashfn, inet_ehashfn,
+ net, daddr, hnum, saddr, sport);
+ reuse_sk = reuseport_select_sock(sk, phash, skb, doff);
+ }
+ return reuse_sk;
+}
+EXPORT_SYMBOL_GPL(inet_lookup_reuseport);
+
+/*
+ * Here are some nice properties to exploit here. The BSD API
+ * does not allow a listening sock to specify the remote port nor the
+ * remote address for the connection. So always assume those are both
+ * wildcarded during the search since they can never be otherwise.
+ */
+
+/* called with rcu_read_lock() : No refcount taken on the socket */
+static struct sock *inet_lhash2_lookup(struct net *net,
+ struct inet_listen_hashbucket *ilb2,
+ struct sk_buff *skb, int doff,
+ const __be32 saddr, __be16 sport,
+ const __be32 daddr, const unsigned short hnum,
+ const int dif, const int sdif)
+{
+ struct sock *sk, *result = NULL;
+ struct hlist_nulls_node *node;
+ int score, hiscore = 0;
+
+ sk_nulls_for_each_rcu(sk, node, &ilb2->nulls_head) {
+ score = compute_score(sk, net, hnum, daddr, dif, sdif);
+ if (score > hiscore) {
+ result = inet_lookup_reuseport(net, sk, skb, doff,
+ saddr, sport, daddr, hnum, inet_ehashfn);
+ if (result)
+ return result;
+
+ result = sk;
+ hiscore = score;
+ }
+ }
+
+ return result;
+}
+
+struct sock *inet_lookup_run_sk_lookup(struct net *net,
+ int protocol,
+ struct sk_buff *skb, int doff,
+ __be32 saddr, __be16 sport,
+ __be32 daddr, u16 hnum, const int dif,
+ inet_ehashfn_t *ehashfn)
+{
+ struct sock *sk, *reuse_sk;
+ bool no_reuseport;
+
+ no_reuseport = bpf_sk_lookup_run_v4(net, protocol, saddr, sport,
+ daddr, hnum, dif, &sk);
+ if (no_reuseport || IS_ERR_OR_NULL(sk))
+ return sk;
+
+ reuse_sk = inet_lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum,
+ ehashfn);
+ if (reuse_sk)
+ sk = reuse_sk;
+ return sk;
+}
+
+struct sock *__inet_lookup_listener(struct net *net,
+ struct inet_hashinfo *hashinfo,
+ struct sk_buff *skb, int doff,
+ const __be32 saddr, __be16 sport,
+ const __be32 daddr, const unsigned short hnum,
+ const int dif, const int sdif)
+{
+ struct inet_listen_hashbucket *ilb2;
+ struct sock *result = NULL;
+ unsigned int hash2;
+
+ /* Lookup redirect from BPF */
+ if (static_branch_unlikely(&bpf_sk_lookup_enabled) &&
+ hashinfo == net->ipv4.tcp_death_row.hashinfo) {
+ result = inet_lookup_run_sk_lookup(net, IPPROTO_TCP, skb, doff,
+ saddr, sport, daddr, hnum, dif,
+ inet_ehashfn);
+ if (result)
+ goto done;
+ }
+
+ hash2 = ipv4_portaddr_hash(net, daddr, hnum);
+ ilb2 = inet_lhash2_bucket(hashinfo, hash2);
+
+ result = inet_lhash2_lookup(net, ilb2, skb, doff,
+ saddr, sport, daddr, hnum,
+ dif, sdif);
+ if (result)
+ goto done;
+
+ /* Lookup lhash2 with INADDR_ANY */
+ hash2 = ipv4_portaddr_hash(net, htonl(INADDR_ANY), hnum);
+ ilb2 = inet_lhash2_bucket(hashinfo, hash2);
+
+ result = inet_lhash2_lookup(net, ilb2, skb, doff,
+ saddr, sport, htonl(INADDR_ANY), hnum,
+ dif, sdif);
+done:
+ if (IS_ERR(result))
+ return NULL;
+ return result;
+}
+EXPORT_SYMBOL_GPL(__inet_lookup_listener);
+
+/* All sockets share common refcount, but have different destructors */
+void sock_gen_put(struct sock *sk)
+{
+ if (!refcount_dec_and_test(&sk->sk_refcnt))
+ return;
+
+ if (sk->sk_state == TCP_TIME_WAIT)
+ inet_twsk_free(inet_twsk(sk));
+ else if (sk->sk_state == TCP_NEW_SYN_RECV)
+ reqsk_free(inet_reqsk(sk));
+ else
+ sk_free(sk);
+}
+EXPORT_SYMBOL_GPL(sock_gen_put);
+
+void sock_edemux(struct sk_buff *skb)
+{
+ sock_gen_put(skb->sk);
+}
+EXPORT_SYMBOL(sock_edemux);
+
+struct sock *__inet_lookup_established(struct net *net,
+ struct inet_hashinfo *hashinfo,
+ const __be32 saddr, const __be16 sport,
+ const __be32 daddr, const u16 hnum,
+ const int dif, const int sdif)
+{
+ INET_ADDR_COOKIE(acookie, saddr, daddr);
+ const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
+ struct sock *sk;
+ const struct hlist_nulls_node *node;
+ /* Optimize here for direct hit, only listening connections can
+ * have wildcards anyways.
+ */
+ unsigned int hash = inet_ehashfn(net, daddr, hnum, saddr, sport);
+ unsigned int slot = hash & hashinfo->ehash_mask;
+ struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
+
+begin:
+ sk_nulls_for_each_rcu(sk, node, &head->chain) {
+ if (sk->sk_hash != hash)
+ continue;
+ if (likely(inet_match(net, sk, acookie, ports, dif, sdif))) {
+ if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
+ goto out;
+ if (unlikely(!inet_match(net, sk, acookie,
+ ports, dif, sdif))) {
+ sock_gen_put(sk);
+ goto begin;
+ }
+ goto found;
+ }
+ }
+ /*
+ * 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.
+ */
+ if (get_nulls_value(node) != slot)
+ goto begin;
+out:
+ sk = NULL;
+found:
+ return sk;
+}
+EXPORT_SYMBOL_GPL(__inet_lookup_established);
+
+/* called with local bh disabled */
+static int __inet_check_established(struct inet_timewait_death_row *death_row,
+ struct sock *sk, __u16 lport,
+ struct inet_timewait_sock **twp)
+{
+ struct inet_hashinfo *hinfo = death_row->hashinfo;
+ struct inet_sock *inet = inet_sk(sk);
+ __be32 daddr = inet->inet_rcv_saddr;
+ __be32 saddr = inet->inet_daddr;
+ int dif = sk->sk_bound_dev_if;
+ struct net *net = sock_net(sk);
+ int sdif = l3mdev_master_ifindex_by_index(net, dif);
+ INET_ADDR_COOKIE(acookie, saddr, daddr);
+ const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
+ unsigned int hash = inet_ehashfn(net, daddr, lport,
+ saddr, inet->inet_dport);
+ struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
+ spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
+ struct sock *sk2;
+ const struct hlist_nulls_node *node;
+ struct inet_timewait_sock *tw = NULL;
+
+ spin_lock(lock);
+
+ sk_nulls_for_each(sk2, node, &head->chain) {
+ if (sk2->sk_hash != hash)
+ continue;
+
+ if (likely(inet_match(net, sk2, acookie, ports, dif, sdif))) {
+ if (sk2->sk_state == TCP_TIME_WAIT) {
+ tw = inet_twsk(sk2);
+ if (twsk_unique(sk, sk2, twp))
+ break;
+ }
+ goto not_unique;
+ }
+ }
+
+ /* Must record num and sport now. Otherwise we will see
+ * in hash table socket with a funny identity.
+ */
+ inet->inet_num = lport;
+ inet->inet_sport = htons(lport);
+ sk->sk_hash = hash;
+ WARN_ON(!sk_unhashed(sk));
+ __sk_nulls_add_node_rcu(sk, &head->chain);
+ if (tw) {
+ sk_nulls_del_node_init_rcu((struct sock *)tw);
+ __NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED);
+ }
+ spin_unlock(lock);
+ sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
+
+ if (twp) {
+ *twp = tw;
+ } else if (tw) {
+ /* Silly. Should hash-dance instead... */
+ inet_twsk_deschedule_put(tw);
+ }
+ return 0;
+
+not_unique:
+ spin_unlock(lock);
+ return -EADDRNOTAVAIL;
+}
+
+static u64 inet_sk_port_offset(const struct sock *sk)
+{
+ const struct inet_sock *inet = inet_sk(sk);
+
+ return secure_ipv4_port_ephemeral(inet->inet_rcv_saddr,
+ inet->inet_daddr,
+ inet->inet_dport);
+}
+
+/* Searches for an exsiting socket in the ehash bucket list.
+ * Returns true if found, false otherwise.
+ */
+static bool inet_ehash_lookup_by_sk(struct sock *sk,
+ struct hlist_nulls_head *list)
+{
+ const __portpair ports = INET_COMBINED_PORTS(sk->sk_dport, sk->sk_num);
+ const int sdif = sk->sk_bound_dev_if;
+ const int dif = sk->sk_bound_dev_if;
+ const struct hlist_nulls_node *node;
+ struct net *net = sock_net(sk);
+ struct sock *esk;
+
+ INET_ADDR_COOKIE(acookie, sk->sk_daddr, sk->sk_rcv_saddr);
+
+ sk_nulls_for_each_rcu(esk, node, list) {
+ if (esk->sk_hash != sk->sk_hash)
+ continue;
+ if (sk->sk_family == AF_INET) {
+ if (unlikely(inet_match(net, esk, acookie,
+ ports, dif, sdif))) {
+ return true;
+ }
+ }
+#if IS_ENABLED(CONFIG_IPV6)
+ else if (sk->sk_family == AF_INET6) {
+ if (unlikely(inet6_match(net, esk,
+ &sk->sk_v6_daddr,
+ &sk->sk_v6_rcv_saddr,
+ ports, dif, sdif))) {
+ return true;
+ }
+ }
+#endif
+ }
+ return false;
+}
+
+/* Insert a socket into ehash, and eventually remove another one
+ * (The another one can be a SYN_RECV or TIMEWAIT)
+ * If an existing socket already exists, socket sk is not inserted,
+ * and sets found_dup_sk parameter to true.
+ */
+bool inet_ehash_insert(struct sock *sk, struct sock *osk, bool *found_dup_sk)
+{
+ struct inet_hashinfo *hashinfo = tcp_or_dccp_get_hashinfo(sk);
+ struct inet_ehash_bucket *head;
+ struct hlist_nulls_head *list;
+ spinlock_t *lock;
+ bool ret = true;
+
+ WARN_ON_ONCE(!sk_unhashed(sk));
+
+ sk->sk_hash = sk_ehashfn(sk);
+ head = inet_ehash_bucket(hashinfo, sk->sk_hash);
+ list = &head->chain;
+ lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
+
+ spin_lock(lock);
+ if (osk) {
+ WARN_ON_ONCE(sk->sk_hash != osk->sk_hash);
+ ret = sk_nulls_del_node_init_rcu(osk);
+ } else if (found_dup_sk) {
+ *found_dup_sk = inet_ehash_lookup_by_sk(sk, list);
+ if (*found_dup_sk)
+ ret = false;
+ }
+
+ if (ret)
+ __sk_nulls_add_node_rcu(sk, list);
+
+ spin_unlock(lock);
+
+ return ret;
+}
+
+bool inet_ehash_nolisten(struct sock *sk, struct sock *osk, bool *found_dup_sk)
+{
+ bool ok = inet_ehash_insert(sk, osk, found_dup_sk);
+
+ if (ok) {
+ sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
+ } else {
+ this_cpu_inc(*sk->sk_prot->orphan_count);
+ inet_sk_set_state(sk, TCP_CLOSE);
+ sock_set_flag(sk, SOCK_DEAD);
+ inet_csk_destroy_sock(sk);
+ }
+ return ok;
+}
+EXPORT_SYMBOL_GPL(inet_ehash_nolisten);
+
+static int inet_reuseport_add_sock(struct sock *sk,
+ struct inet_listen_hashbucket *ilb)
+{
+ struct inet_bind_bucket *tb = inet_csk(sk)->icsk_bind_hash;
+ const struct hlist_nulls_node *node;
+ struct sock *sk2;
+ kuid_t uid = sock_i_uid(sk);
+
+ sk_nulls_for_each_rcu(sk2, node, &ilb->nulls_head) {
+ if (sk2 != sk &&
+ sk2->sk_family == sk->sk_family &&
+ ipv6_only_sock(sk2) == ipv6_only_sock(sk) &&
+ sk2->sk_bound_dev_if == sk->sk_bound_dev_if &&
+ inet_csk(sk2)->icsk_bind_hash == tb &&
+ sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) &&
+ inet_rcv_saddr_equal(sk, sk2, false))
+ return reuseport_add_sock(sk, sk2,
+ inet_rcv_saddr_any(sk));
+ }
+
+ return reuseport_alloc(sk, inet_rcv_saddr_any(sk));
+}
+
+int __inet_hash(struct sock *sk, struct sock *osk)
+{
+ struct inet_hashinfo *hashinfo = tcp_or_dccp_get_hashinfo(sk);
+ struct inet_listen_hashbucket *ilb2;
+ int err = 0;
+
+ if (sk->sk_state != TCP_LISTEN) {
+ local_bh_disable();
+ inet_ehash_nolisten(sk, osk, NULL);
+ local_bh_enable();
+ return 0;
+ }
+ WARN_ON(!sk_unhashed(sk));
+ ilb2 = inet_lhash2_bucket_sk(hashinfo, sk);
+
+ spin_lock(&ilb2->lock);
+ if (sk->sk_reuseport) {
+ err = inet_reuseport_add_sock(sk, ilb2);
+ if (err)
+ goto unlock;
+ }
+ sock_set_flag(sk, SOCK_RCU_FREE);
+ if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
+ sk->sk_family == AF_INET6)
+ __sk_nulls_add_node_tail_rcu(sk, &ilb2->nulls_head);
+ else
+ __sk_nulls_add_node_rcu(sk, &ilb2->nulls_head);
+ sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
+unlock:
+ spin_unlock(&ilb2->lock);
+
+ return err;
+}
+EXPORT_SYMBOL(__inet_hash);
+
+int inet_hash(struct sock *sk)
+{
+ int err = 0;
+
+ if (sk->sk_state != TCP_CLOSE)
+ err = __inet_hash(sk, NULL);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(inet_hash);
+
+void inet_unhash(struct sock *sk)
+{
+ struct inet_hashinfo *hashinfo = tcp_or_dccp_get_hashinfo(sk);
+
+ if (sk_unhashed(sk))
+ return;
+
+ if (sk->sk_state == TCP_LISTEN) {
+ struct inet_listen_hashbucket *ilb2;
+
+ ilb2 = inet_lhash2_bucket_sk(hashinfo, sk);
+ /* Don't disable bottom halves while acquiring the lock to
+ * avoid circular locking dependency on PREEMPT_RT.
+ */
+ spin_lock(&ilb2->lock);
+ if (sk_unhashed(sk)) {
+ spin_unlock(&ilb2->lock);
+ return;
+ }
+
+ if (rcu_access_pointer(sk->sk_reuseport_cb))
+ reuseport_stop_listen_sock(sk);
+
+ __sk_nulls_del_node_init_rcu(sk);
+ sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
+ spin_unlock(&ilb2->lock);
+ } else {
+ spinlock_t *lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
+
+ spin_lock_bh(lock);
+ if (sk_unhashed(sk)) {
+ spin_unlock_bh(lock);
+ return;
+ }
+ __sk_nulls_del_node_init_rcu(sk);
+ sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
+ spin_unlock_bh(lock);
+ }
+}
+EXPORT_SYMBOL_GPL(inet_unhash);
+
+static bool inet_bind2_bucket_match(const struct inet_bind2_bucket *tb,
+ const struct net *net, unsigned short port,
+ int l3mdev, const struct sock *sk)
+{
+ if (!net_eq(ib2_net(tb), net) || tb->port != port ||
+ tb->l3mdev != l3mdev)
+ return false;
+
+ return inet_bind2_bucket_addr_match(tb, sk);
+}
+
+bool inet_bind2_bucket_match_addr_any(const struct inet_bind2_bucket *tb, const struct net *net,
+ unsigned short port, int l3mdev, const struct sock *sk)
+{
+ if (!net_eq(ib2_net(tb), net) || tb->port != port ||
+ tb->l3mdev != l3mdev)
+ return false;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (sk->sk_family != tb->family) {
+ if (sk->sk_family == AF_INET)
+ return ipv6_addr_any(&tb->v6_rcv_saddr) ||
+ ipv6_addr_v4mapped_any(&tb->v6_rcv_saddr);
+
+ return false;
+ }
+
+ if (sk->sk_family == AF_INET6)
+ return ipv6_addr_any(&tb->v6_rcv_saddr);
+#endif
+ return tb->rcv_saddr == 0;
+}
+
+/* The socket's bhash2 hashbucket spinlock must be held when this is called */
+struct inet_bind2_bucket *
+inet_bind2_bucket_find(const struct inet_bind_hashbucket *head, const struct net *net,
+ unsigned short port, int l3mdev, const struct sock *sk)
+{
+ struct inet_bind2_bucket *bhash2 = NULL;
+
+ inet_bind_bucket_for_each(bhash2, &head->chain)
+ if (inet_bind2_bucket_match(bhash2, net, port, l3mdev, sk))
+ break;
+
+ return bhash2;
+}
+
+struct inet_bind_hashbucket *
+inet_bhash2_addr_any_hashbucket(const struct sock *sk, const struct net *net, int port)
+{
+ struct inet_hashinfo *hinfo = tcp_or_dccp_get_hashinfo(sk);
+ u32 hash;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (sk->sk_family == AF_INET6)
+ hash = ipv6_portaddr_hash(net, &in6addr_any, port);
+ else
+#endif
+ hash = ipv4_portaddr_hash(net, 0, port);
+
+ return &hinfo->bhash2[hash & (hinfo->bhash_size - 1)];
+}
+
+static void inet_update_saddr(struct sock *sk, void *saddr, int family)
+{
+ if (family == AF_INET) {
+ inet_sk(sk)->inet_saddr = *(__be32 *)saddr;
+ sk_rcv_saddr_set(sk, inet_sk(sk)->inet_saddr);
+ }
+#if IS_ENABLED(CONFIG_IPV6)
+ else {
+ sk->sk_v6_rcv_saddr = *(struct in6_addr *)saddr;
+ }
+#endif
+}
+
+static int __inet_bhash2_update_saddr(struct sock *sk, void *saddr, int family, bool reset)
+{
+ struct inet_hashinfo *hinfo = tcp_or_dccp_get_hashinfo(sk);
+ struct inet_bind_hashbucket *head, *head2;
+ struct inet_bind2_bucket *tb2, *new_tb2;
+ int l3mdev = inet_sk_bound_l3mdev(sk);
+ int port = inet_sk(sk)->inet_num;
+ struct net *net = sock_net(sk);
+ int bhash;
+
+ if (!inet_csk(sk)->icsk_bind2_hash) {
+ /* Not bind()ed before. */
+ if (reset)
+ inet_reset_saddr(sk);
+ else
+ inet_update_saddr(sk, saddr, family);
+
+ return 0;
+ }
+
+ /* Allocate a bind2 bucket ahead of time to avoid permanently putting
+ * the bhash2 table in an inconsistent state if a new tb2 bucket
+ * allocation fails.
+ */
+ new_tb2 = kmem_cache_alloc(hinfo->bind2_bucket_cachep, GFP_ATOMIC);
+ if (!new_tb2) {
+ if (reset) {
+ /* The (INADDR_ANY, port) bucket might have already
+ * been freed, then we cannot fixup icsk_bind2_hash,
+ * so we give up and unlink sk from bhash/bhash2 not
+ * to leave inconsistency in bhash2.
+ */
+ inet_put_port(sk);
+ inet_reset_saddr(sk);
+ }
+
+ return -ENOMEM;
+ }
+
+ bhash = inet_bhashfn(net, port, hinfo->bhash_size);
+ head = &hinfo->bhash[bhash];
+ head2 = inet_bhashfn_portaddr(hinfo, sk, net, port);
+
+ /* If we change saddr locklessly, another thread
+ * iterating over bhash might see corrupted address.
+ */
+ spin_lock_bh(&head->lock);
+
+ spin_lock(&head2->lock);
+ __sk_del_bind2_node(sk);
+ inet_bind2_bucket_destroy(hinfo->bind2_bucket_cachep, inet_csk(sk)->icsk_bind2_hash);
+ spin_unlock(&head2->lock);
+
+ if (reset)
+ inet_reset_saddr(sk);
+ else
+ inet_update_saddr(sk, saddr, family);
+
+ head2 = inet_bhashfn_portaddr(hinfo, sk, net, port);
+
+ spin_lock(&head2->lock);
+ tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, sk);
+ if (!tb2) {
+ tb2 = new_tb2;
+ inet_bind2_bucket_init(tb2, net, head2, port, l3mdev, sk);
+ }
+ sk_add_bind2_node(sk, &tb2->owners);
+ inet_csk(sk)->icsk_bind2_hash = tb2;
+ spin_unlock(&head2->lock);
+
+ spin_unlock_bh(&head->lock);
+
+ if (tb2 != new_tb2)
+ kmem_cache_free(hinfo->bind2_bucket_cachep, new_tb2);
+
+ return 0;
+}
+
+int inet_bhash2_update_saddr(struct sock *sk, void *saddr, int family)
+{
+ return __inet_bhash2_update_saddr(sk, saddr, family, false);
+}
+EXPORT_SYMBOL_GPL(inet_bhash2_update_saddr);
+
+void inet_bhash2_reset_saddr(struct sock *sk)
+{
+ if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
+ __inet_bhash2_update_saddr(sk, NULL, 0, true);
+}
+EXPORT_SYMBOL_GPL(inet_bhash2_reset_saddr);
+
+/* RFC 6056 3.3.4. Algorithm 4: Double-Hash Port Selection Algorithm
+ * Note that we use 32bit integers (vs RFC 'short integers')
+ * because 2^16 is not a multiple of num_ephemeral and this
+ * property might be used by clever attacker.
+ *
+ * RFC claims using TABLE_LENGTH=10 buckets gives an improvement, though
+ * attacks were since demonstrated, thus we use 65536 by default instead
+ * to really give more isolation and privacy, at the expense of 256kB
+ * of kernel memory.
+ */
+#define INET_TABLE_PERTURB_SIZE (1 << CONFIG_INET_TABLE_PERTURB_ORDER)
+static u32 *table_perturb;
+
+int __inet_hash_connect(struct inet_timewait_death_row *death_row,
+ struct sock *sk, u64 port_offset,
+ int (*check_established)(struct inet_timewait_death_row *,
+ struct sock *, __u16, struct inet_timewait_sock **))
+{
+ struct inet_hashinfo *hinfo = death_row->hashinfo;
+ struct inet_bind_hashbucket *head, *head2;
+ struct inet_timewait_sock *tw = NULL;
+ int port = inet_sk(sk)->inet_num;
+ struct net *net = sock_net(sk);
+ struct inet_bind2_bucket *tb2;
+ struct inet_bind_bucket *tb;
+ bool tb_created = false;
+ u32 remaining, offset;
+ int ret, i, low, high;
+ int l3mdev;
+ u32 index;
+
+ if (port) {
+ local_bh_disable();
+ ret = check_established(death_row, sk, port, NULL);
+ local_bh_enable();
+ return ret;
+ }
+
+ l3mdev = inet_sk_bound_l3mdev(sk);
+
+ inet_sk_get_local_port_range(sk, &low, &high);
+ high++; /* [32768, 60999] -> [32768, 61000[ */
+ remaining = high - low;
+ if (likely(remaining > 1))
+ remaining &= ~1U;
+
+ get_random_sleepable_once(table_perturb,
+ INET_TABLE_PERTURB_SIZE * sizeof(*table_perturb));
+ index = port_offset & (INET_TABLE_PERTURB_SIZE - 1);
+
+ offset = READ_ONCE(table_perturb[index]) + (port_offset >> 32);
+ offset %= remaining;
+
+ /* In first pass we try ports of @low parity.
+ * inet_csk_get_port() does the opposite choice.
+ */
+ offset &= ~1U;
+other_parity_scan:
+ port = low + offset;
+ for (i = 0; i < remaining; i += 2, port += 2) {
+ if (unlikely(port >= high))
+ port -= remaining;
+ if (inet_is_local_reserved_port(net, port))
+ continue;
+ head = &hinfo->bhash[inet_bhashfn(net, port,
+ hinfo->bhash_size)];
+ spin_lock_bh(&head->lock);
+
+ /* Does not bother with rcv_saddr checks, because
+ * the established check is already unique enough.
+ */
+ inet_bind_bucket_for_each(tb, &head->chain) {
+ if (inet_bind_bucket_match(tb, net, port, l3mdev)) {
+ if (tb->fastreuse >= 0 ||
+ tb->fastreuseport >= 0)
+ goto next_port;
+ WARN_ON(hlist_empty(&tb->owners));
+ if (!check_established(death_row, sk,
+ port, &tw))
+ goto ok;
+ goto next_port;
+ }
+ }
+
+ tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
+ net, head, port, l3mdev);
+ if (!tb) {
+ spin_unlock_bh(&head->lock);
+ return -ENOMEM;
+ }
+ tb_created = true;
+ tb->fastreuse = -1;
+ tb->fastreuseport = -1;
+ goto ok;
+next_port:
+ spin_unlock_bh(&head->lock);
+ cond_resched();
+ }
+
+ offset++;
+ if ((offset & 1) && remaining > 1)
+ goto other_parity_scan;
+
+ return -EADDRNOTAVAIL;
+
+ok:
+ /* Find the corresponding tb2 bucket since we need to
+ * add the socket to the bhash2 table as well
+ */
+ head2 = inet_bhashfn_portaddr(hinfo, sk, net, port);
+ spin_lock(&head2->lock);
+
+ tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, sk);
+ if (!tb2) {
+ tb2 = inet_bind2_bucket_create(hinfo->bind2_bucket_cachep, net,
+ head2, port, l3mdev, sk);
+ if (!tb2)
+ goto error;
+ }
+
+ /* Here we want to add a little bit of randomness to the next source
+ * port that will be chosen. We use a max() with a random here so that
+ * on low contention the randomness is maximal and on high contention
+ * it may be inexistent.
+ */
+ i = max_t(int, i, get_random_u32_below(8) * 2);
+ WRITE_ONCE(table_perturb[index], READ_ONCE(table_perturb[index]) + i + 2);
+
+ /* Head lock still held and bh's disabled */
+ inet_bind_hash(sk, tb, tb2, port);
+
+ if (sk_unhashed(sk)) {
+ inet_sk(sk)->inet_sport = htons(port);
+ inet_ehash_nolisten(sk, (struct sock *)tw, NULL);
+ }
+ if (tw)
+ inet_twsk_bind_unhash(tw, hinfo);
+
+ spin_unlock(&head2->lock);
+ spin_unlock(&head->lock);
+
+ if (tw)
+ inet_twsk_deschedule_put(tw);
+ local_bh_enable();
+ return 0;
+
+error:
+ spin_unlock(&head2->lock);
+ if (tb_created)
+ inet_bind_bucket_destroy(hinfo->bind_bucket_cachep, tb);
+ spin_unlock_bh(&head->lock);
+ return -ENOMEM;
+}
+
+/*
+ * Bind a port for a connect operation and hash it.
+ */
+int inet_hash_connect(struct inet_timewait_death_row *death_row,
+ struct sock *sk)
+{
+ u64 port_offset = 0;
+
+ if (!inet_sk(sk)->inet_num)
+ port_offset = inet_sk_port_offset(sk);
+ return __inet_hash_connect(death_row, sk, port_offset,
+ __inet_check_established);
+}
+EXPORT_SYMBOL_GPL(inet_hash_connect);
+
+static void init_hashinfo_lhash2(struct inet_hashinfo *h)
+{
+ int i;
+
+ for (i = 0; i <= h->lhash2_mask; i++) {
+ spin_lock_init(&h->lhash2[i].lock);
+ INIT_HLIST_NULLS_HEAD(&h->lhash2[i].nulls_head,
+ i + LISTENING_NULLS_BASE);
+ }
+}
+
+void __init inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
+ unsigned long numentries, int scale,
+ unsigned long low_limit,
+ unsigned long high_limit)
+{
+ h->lhash2 = alloc_large_system_hash(name,
+ sizeof(*h->lhash2),
+ numentries,
+ scale,
+ 0,
+ NULL,
+ &h->lhash2_mask,
+ low_limit,
+ high_limit);
+ init_hashinfo_lhash2(h);
+
+ /* this one is used for source ports of outgoing connections */
+ table_perturb = alloc_large_system_hash("Table-perturb",
+ sizeof(*table_perturb),
+ INET_TABLE_PERTURB_SIZE,
+ 0, 0, NULL, NULL,
+ INET_TABLE_PERTURB_SIZE,
+ INET_TABLE_PERTURB_SIZE);
+}
+
+int inet_hashinfo2_init_mod(struct inet_hashinfo *h)
+{
+ h->lhash2 = kmalloc_array(INET_LHTABLE_SIZE, sizeof(*h->lhash2), GFP_KERNEL);
+ if (!h->lhash2)
+ return -ENOMEM;
+
+ h->lhash2_mask = INET_LHTABLE_SIZE - 1;
+ /* INET_LHTABLE_SIZE must be a power of 2 */
+ BUG_ON(INET_LHTABLE_SIZE & h->lhash2_mask);
+
+ init_hashinfo_lhash2(h);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(inet_hashinfo2_init_mod);
+
+int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
+{
+ unsigned int locksz = sizeof(spinlock_t);
+ unsigned int i, nblocks = 1;
+
+ if (locksz != 0) {
+ /* allocate 2 cache lines or at least one spinlock per cpu */
+ nblocks = max(2U * L1_CACHE_BYTES / locksz, 1U);
+ nblocks = roundup_pow_of_two(nblocks * num_possible_cpus());
+
+ /* no more locks than number of hash buckets */
+ nblocks = min(nblocks, hashinfo->ehash_mask + 1);
+
+ hashinfo->ehash_locks = kvmalloc_array(nblocks, locksz, GFP_KERNEL);
+ if (!hashinfo->ehash_locks)
+ return -ENOMEM;
+
+ for (i = 0; i < nblocks; i++)
+ spin_lock_init(&hashinfo->ehash_locks[i]);
+ }
+ hashinfo->ehash_locks_mask = nblocks - 1;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(inet_ehash_locks_alloc);
+
+struct inet_hashinfo *inet_pernet_hashinfo_alloc(struct inet_hashinfo *hashinfo,
+ unsigned int ehash_entries)
+{
+ struct inet_hashinfo *new_hashinfo;
+ int i;
+
+ new_hashinfo = kmemdup(hashinfo, sizeof(*hashinfo), GFP_KERNEL);
+ if (!new_hashinfo)
+ goto err;
+
+ new_hashinfo->ehash = vmalloc_huge(ehash_entries * sizeof(struct inet_ehash_bucket),
+ GFP_KERNEL_ACCOUNT);
+ if (!new_hashinfo->ehash)
+ goto free_hashinfo;
+
+ new_hashinfo->ehash_mask = ehash_entries - 1;
+
+ if (inet_ehash_locks_alloc(new_hashinfo))
+ goto free_ehash;
+
+ for (i = 0; i < ehash_entries; i++)
+ INIT_HLIST_NULLS_HEAD(&new_hashinfo->ehash[i].chain, i);
+
+ new_hashinfo->pernet = true;
+
+ return new_hashinfo;
+
+free_ehash:
+ vfree(new_hashinfo->ehash);
+free_hashinfo:
+ kfree(new_hashinfo);
+err:
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(inet_pernet_hashinfo_alloc);
+
+void inet_pernet_hashinfo_free(struct inet_hashinfo *hashinfo)
+{
+ if (!hashinfo->pernet)
+ return;
+
+ inet_ehash_locks_free(hashinfo);
+ vfree(hashinfo->ehash);
+ kfree(hashinfo);
+}
+EXPORT_SYMBOL_GPL(inet_pernet_hashinfo_free);