v4.19.13 snapshot.
diff --git a/net/rds/bind.c b/net/rds/bind.c
new file mode 100644
index 0000000..762d2c6
--- /dev/null
+++ b/net/rds/bind.c
@@ -0,0 +1,282 @@
+/*
+ * Copyright (c) 2006, 2018 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#include <linux/kernel.h>
+#include <net/sock.h>
+#include <linux/in.h>
+#include <linux/ipv6.h>
+#include <linux/if_arp.h>
+#include <linux/jhash.h>
+#include <linux/ratelimit.h>
+#include "rds.h"
+
+static struct rhashtable bind_hash_table;
+
+static const struct rhashtable_params ht_parms = {
+ .nelem_hint = 768,
+ .key_len = RDS_BOUND_KEY_LEN,
+ .key_offset = offsetof(struct rds_sock, rs_bound_key),
+ .head_offset = offsetof(struct rds_sock, rs_bound_node),
+ .max_size = 16384,
+ .min_size = 1024,
+};
+
+/* Create a key for the bind hash table manipulation. Port is in network byte
+ * order.
+ */
+static inline void __rds_create_bind_key(u8 *key, const struct in6_addr *addr,
+ __be16 port, __u32 scope_id)
+{
+ memcpy(key, addr, sizeof(*addr));
+ key += sizeof(*addr);
+ memcpy(key, &port, sizeof(port));
+ key += sizeof(port);
+ memcpy(key, &scope_id, sizeof(scope_id));
+}
+
+/*
+ * Return the rds_sock bound at the given local address.
+ *
+ * The rx path can race with rds_release. We notice if rds_release() has
+ * marked this socket and don't return a rs ref to the rx path.
+ */
+struct rds_sock *rds_find_bound(const struct in6_addr *addr, __be16 port,
+ __u32 scope_id)
+{
+ u8 key[RDS_BOUND_KEY_LEN];
+ struct rds_sock *rs;
+
+ __rds_create_bind_key(key, addr, port, scope_id);
+ rcu_read_lock();
+ rs = rhashtable_lookup(&bind_hash_table, key, ht_parms);
+ if (rs && !sock_flag(rds_rs_to_sk(rs), SOCK_DEAD))
+ rds_sock_addref(rs);
+ else
+ rs = NULL;
+ rcu_read_unlock();
+
+ rdsdebug("returning rs %p for %pI6c:%u\n", rs, addr,
+ ntohs(port));
+
+ return rs;
+}
+
+/* returns -ve errno or +ve port */
+static int rds_add_bound(struct rds_sock *rs, const struct in6_addr *addr,
+ __be16 *port, __u32 scope_id)
+{
+ int ret = -EADDRINUSE;
+ u16 rover, last;
+ u8 key[RDS_BOUND_KEY_LEN];
+
+ if (*port != 0) {
+ rover = be16_to_cpu(*port);
+ if (rover == RDS_FLAG_PROBE_PORT)
+ return -EINVAL;
+ last = rover;
+ } else {
+ rover = max_t(u16, prandom_u32(), 2);
+ last = rover - 1;
+ }
+
+ do {
+ if (rover == 0)
+ rover++;
+
+ if (rover == RDS_FLAG_PROBE_PORT)
+ continue;
+ __rds_create_bind_key(key, addr, cpu_to_be16(rover),
+ scope_id);
+ if (rhashtable_lookup_fast(&bind_hash_table, key, ht_parms))
+ continue;
+
+ memcpy(rs->rs_bound_key, key, sizeof(rs->rs_bound_key));
+ rs->rs_bound_addr = *addr;
+ net_get_random_once(&rs->rs_hash_initval,
+ sizeof(rs->rs_hash_initval));
+ rs->rs_bound_port = cpu_to_be16(rover);
+ rs->rs_bound_node.next = NULL;
+ rds_sock_addref(rs);
+ if (!rhashtable_insert_fast(&bind_hash_table,
+ &rs->rs_bound_node, ht_parms)) {
+ *port = rs->rs_bound_port;
+ rs->rs_bound_scope_id = scope_id;
+ ret = 0;
+ rdsdebug("rs %p binding to %pI6c:%d\n",
+ rs, addr, (int)ntohs(*port));
+ break;
+ } else {
+ rs->rs_bound_addr = in6addr_any;
+ rds_sock_put(rs);
+ ret = -ENOMEM;
+ break;
+ }
+ } while (rover++ != last);
+
+ return ret;
+}
+
+void rds_remove_bound(struct rds_sock *rs)
+{
+
+ if (ipv6_addr_any(&rs->rs_bound_addr))
+ return;
+
+ rdsdebug("rs %p unbinding from %pI6c:%d\n",
+ rs, &rs->rs_bound_addr,
+ ntohs(rs->rs_bound_port));
+
+ rhashtable_remove_fast(&bind_hash_table, &rs->rs_bound_node, ht_parms);
+ rds_sock_put(rs);
+ rs->rs_bound_addr = in6addr_any;
+}
+
+int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
+{
+ struct sock *sk = sock->sk;
+ struct rds_sock *rs = rds_sk_to_rs(sk);
+ struct in6_addr v6addr, *binding_addr;
+ struct rds_transport *trans;
+ __u32 scope_id = 0;
+ int ret = 0;
+ __be16 port;
+
+ /* We allow an RDS socket to be bound to either IPv4 or IPv6
+ * address.
+ */
+ if (uaddr->sa_family == AF_INET) {
+ struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
+
+ if (addr_len < sizeof(struct sockaddr_in) ||
+ sin->sin_addr.s_addr == htonl(INADDR_ANY) ||
+ sin->sin_addr.s_addr == htonl(INADDR_BROADCAST) ||
+ IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
+ return -EINVAL;
+ ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &v6addr);
+ binding_addr = &v6addr;
+ port = sin->sin_port;
+#if IS_ENABLED(CONFIG_IPV6)
+ } else if (uaddr->sa_family == AF_INET6) {
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)uaddr;
+ int addr_type;
+
+ if (addr_len < sizeof(struct sockaddr_in6))
+ return -EINVAL;
+ addr_type = ipv6_addr_type(&sin6->sin6_addr);
+ if (!(addr_type & IPV6_ADDR_UNICAST)) {
+ __be32 addr4;
+
+ if (!(addr_type & IPV6_ADDR_MAPPED))
+ return -EINVAL;
+
+ /* It is a mapped address. Need to do some sanity
+ * checks.
+ */
+ addr4 = sin6->sin6_addr.s6_addr32[3];
+ if (addr4 == htonl(INADDR_ANY) ||
+ addr4 == htonl(INADDR_BROADCAST) ||
+ IN_MULTICAST(ntohl(addr4)))
+ return -EINVAL;
+ }
+ /* The scope ID must be specified for link local address. */
+ if (addr_type & IPV6_ADDR_LINKLOCAL) {
+ if (sin6->sin6_scope_id == 0)
+ return -EINVAL;
+ scope_id = sin6->sin6_scope_id;
+ }
+ binding_addr = &sin6->sin6_addr;
+ port = sin6->sin6_port;
+#endif
+ } else {
+ return -EINVAL;
+ }
+ lock_sock(sk);
+
+ /* RDS socket does not allow re-binding. */
+ if (!ipv6_addr_any(&rs->rs_bound_addr)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ /* Socket is connected. The binding address should have the same
+ * scope ID as the connected address, except the case when one is
+ * non-link local address (scope_id is 0).
+ */
+ if (!ipv6_addr_any(&rs->rs_conn_addr) && scope_id &&
+ rs->rs_bound_scope_id &&
+ scope_id != rs->rs_bound_scope_id) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ sock_set_flag(sk, SOCK_RCU_FREE);
+ ret = rds_add_bound(rs, binding_addr, &port, scope_id);
+ if (ret)
+ goto out;
+
+ if (rs->rs_transport) { /* previously bound */
+ trans = rs->rs_transport;
+ if (trans->laddr_check(sock_net(sock->sk),
+ binding_addr, scope_id) != 0) {
+ ret = -ENOPROTOOPT;
+ rds_remove_bound(rs);
+ } else {
+ ret = 0;
+ }
+ goto out;
+ }
+ trans = rds_trans_get_preferred(sock_net(sock->sk), binding_addr,
+ scope_id);
+ if (!trans) {
+ ret = -EADDRNOTAVAIL;
+ rds_remove_bound(rs);
+ pr_info_ratelimited("RDS: %s could not find a transport for %pI6c, load rds_tcp or rds_rdma?\n",
+ __func__, binding_addr);
+ goto out;
+ }
+
+ rs->rs_transport = trans;
+ ret = 0;
+
+out:
+ release_sock(sk);
+ return ret;
+}
+
+void rds_bind_lock_destroy(void)
+{
+ rhashtable_destroy(&bind_hash_table);
+}
+
+int rds_bind_lock_init(void)
+{
+ return rhashtable_init(&bind_hash_table, &ht_parms);
+}