/* * Copyright (c) 2006, 2019 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) ||		   !refcount_inc_not_zero(&rds_rs_to_sk(rs)->sk_refcnt)))		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, get_random_u16(), 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_unsized *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 (addr_len < offsetofend(struct sockaddr, sa_family))		return -EINVAL;	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) ||		    ipv4_is_multicast(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) ||			    ipv4_is_multicast(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;	} 	/* The transport can be set using SO_RDS_TRANSPORT option before the	 * socket is bound.	 */	if (rs->rs_transport) {		trans = rs->rs_transport;		if (!trans->laddr_check ||		    trans->laddr_check(sock_net(sock->sk),				       binding_addr, scope_id) != 0) {			ret = -ENOPROTOOPT;			goto out;		}	} else {		trans = rds_trans_get_preferred(sock_net(sock->sk),						binding_addr, scope_id);		if (!trans) {			ret = -EADDRNOTAVAIL;			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;	} 	sock_set_flag(sk, SOCK_RCU_FREE);	ret = rds_add_bound(rs, binding_addr, &port, scope_id);	if (ret)		rs->rs_transport = NULL; 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);}