535 lines
13 KiB
C
535 lines
13 KiB
C
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/*
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* Copyright (c) 2005 Voltaire Inc. All rights reserved.
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* Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
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* Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
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* Copyright (c) 2005 Intel Corporation. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/mutex.h>
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#include <linux/inetdevice.h>
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#include <linux/workqueue.h>
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#include <linux/if_arp.h>
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#include <net/arp.h>
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#include <net/neighbour.h>
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#include <net/route.h>
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#include <net/netevent.h>
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#include <net/addrconf.h>
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#include <net/ip6_route.h>
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#include <rdma/ib_addr.h>
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MODULE_AUTHOR("Sean Hefty");
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MODULE_DESCRIPTION("IB Address Translation");
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MODULE_LICENSE("Dual BSD/GPL");
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struct addr_req {
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struct list_head list;
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struct sockaddr_storage src_addr;
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struct sockaddr_storage dst_addr;
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struct rdma_dev_addr *addr;
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struct rdma_addr_client *client;
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void *context;
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void (*callback)(int status, struct sockaddr *src_addr,
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struct rdma_dev_addr *addr, void *context);
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unsigned long timeout;
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int status;
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};
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static void process_req(struct work_struct *work);
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static DEFINE_MUTEX(lock);
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static LIST_HEAD(req_list);
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static DECLARE_DELAYED_WORK(work, process_req);
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static struct workqueue_struct *addr_wq;
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void rdma_addr_register_client(struct rdma_addr_client *client)
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{
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atomic_set(&client->refcount, 1);
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init_completion(&client->comp);
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}
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EXPORT_SYMBOL(rdma_addr_register_client);
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static inline void put_client(struct rdma_addr_client *client)
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{
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if (atomic_dec_and_test(&client->refcount))
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complete(&client->comp);
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}
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void rdma_addr_unregister_client(struct rdma_addr_client *client)
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{
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put_client(client);
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wait_for_completion(&client->comp);
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}
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EXPORT_SYMBOL(rdma_addr_unregister_client);
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int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
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const unsigned char *dst_dev_addr)
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{
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switch (dev->type) {
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case ARPHRD_INFINIBAND:
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dev_addr->dev_type = RDMA_NODE_IB_CA;
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break;
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case ARPHRD_ETHER:
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dev_addr->dev_type = RDMA_NODE_RNIC;
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break;
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default:
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return -EADDRNOTAVAIL;
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}
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memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
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memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
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if (dst_dev_addr)
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memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
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dev_addr->src_dev = dev;
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return 0;
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}
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EXPORT_SYMBOL(rdma_copy_addr);
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int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
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{
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struct net_device *dev;
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int ret = -EADDRNOTAVAIL;
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switch (addr->sa_family) {
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case AF_INET:
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dev = ip_dev_find(&init_net,
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((struct sockaddr_in *) addr)->sin_addr.s_addr);
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if (!dev)
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return ret;
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ret = rdma_copy_addr(dev_addr, dev, NULL);
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dev_put(dev);
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break;
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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case AF_INET6:
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for_each_netdev(&init_net, dev) {
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if (ipv6_chk_addr(&init_net,
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&((struct sockaddr_in6 *) addr)->sin6_addr,
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dev, 1)) {
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ret = rdma_copy_addr(dev_addr, dev, NULL);
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break;
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}
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}
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break;
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#endif
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}
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return ret;
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}
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EXPORT_SYMBOL(rdma_translate_ip);
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static void set_timeout(unsigned long time)
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{
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unsigned long delay;
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cancel_delayed_work(&work);
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delay = time - jiffies;
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if ((long)delay <= 0)
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delay = 1;
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queue_delayed_work(addr_wq, &work, delay);
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}
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static void queue_req(struct addr_req *req)
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{
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struct addr_req *temp_req;
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mutex_lock(&lock);
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list_for_each_entry_reverse(temp_req, &req_list, list) {
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if (time_after_eq(req->timeout, temp_req->timeout))
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break;
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}
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list_add(&req->list, &temp_req->list);
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if (req_list.next == &req->list)
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set_timeout(req->timeout);
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mutex_unlock(&lock);
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}
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static void addr_send_arp(struct sockaddr *dst_in)
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{
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struct rtable *rt;
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struct flowi fl;
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memset(&fl, 0, sizeof fl);
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switch (dst_in->sa_family) {
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case AF_INET:
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fl.nl_u.ip4_u.daddr =
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((struct sockaddr_in *) dst_in)->sin_addr.s_addr;
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if (ip_route_output_key(&init_net, &rt, &fl))
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return;
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neigh_event_send(rt->u.dst.neighbour, NULL);
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ip_rt_put(rt);
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break;
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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case AF_INET6:
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{
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struct dst_entry *dst;
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fl.nl_u.ip6_u.daddr =
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((struct sockaddr_in6 *) dst_in)->sin6_addr;
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dst = ip6_route_output(&init_net, NULL, &fl);
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if (!dst)
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return;
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neigh_event_send(dst->neighbour, NULL);
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dst_release(dst);
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break;
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}
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#endif
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}
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}
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static int addr4_resolve_remote(struct sockaddr_in *src_in,
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struct sockaddr_in *dst_in,
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struct rdma_dev_addr *addr)
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{
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__be32 src_ip = src_in->sin_addr.s_addr;
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__be32 dst_ip = dst_in->sin_addr.s_addr;
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struct flowi fl;
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struct rtable *rt;
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struct neighbour *neigh;
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int ret;
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memset(&fl, 0, sizeof fl);
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fl.nl_u.ip4_u.daddr = dst_ip;
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fl.nl_u.ip4_u.saddr = src_ip;
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ret = ip_route_output_key(&init_net, &rt, &fl);
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if (ret)
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goto out;
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/* If the device does ARP internally, return 'done' */
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if (rt->idev->dev->flags & IFF_NOARP) {
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rdma_copy_addr(addr, rt->idev->dev, NULL);
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goto put;
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}
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neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev);
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if (!neigh) {
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ret = -ENODATA;
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goto put;
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}
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if (!(neigh->nud_state & NUD_VALID)) {
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ret = -ENODATA;
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goto release;
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}
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if (!src_ip) {
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src_in->sin_family = dst_in->sin_family;
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src_in->sin_addr.s_addr = rt->rt_src;
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}
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ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
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release:
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neigh_release(neigh);
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put:
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ip_rt_put(rt);
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out:
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return ret;
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}
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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static int addr6_resolve_remote(struct sockaddr_in6 *src_in,
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struct sockaddr_in6 *dst_in,
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struct rdma_dev_addr *addr)
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{
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struct flowi fl;
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struct neighbour *neigh;
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struct dst_entry *dst;
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int ret = -ENODATA;
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memset(&fl, 0, sizeof fl);
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fl.nl_u.ip6_u.daddr = dst_in->sin6_addr;
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fl.nl_u.ip6_u.saddr = src_in->sin6_addr;
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dst = ip6_route_output(&init_net, NULL, &fl);
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if (!dst)
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return ret;
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if (dst->dev->flags & IFF_NOARP) {
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ret = rdma_copy_addr(addr, dst->dev, NULL);
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} else {
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neigh = dst->neighbour;
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if (neigh && (neigh->nud_state & NUD_VALID))
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ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
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}
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dst_release(dst);
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return ret;
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}
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#else
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static int addr6_resolve_remote(struct sockaddr_in6 *src_in,
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struct sockaddr_in6 *dst_in,
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struct rdma_dev_addr *addr)
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{
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return -EADDRNOTAVAIL;
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}
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#endif
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static int addr_resolve_remote(struct sockaddr *src_in,
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struct sockaddr *dst_in,
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struct rdma_dev_addr *addr)
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{
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if (src_in->sa_family == AF_INET) {
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return addr4_resolve_remote((struct sockaddr_in *) src_in,
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(struct sockaddr_in *) dst_in, addr);
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} else
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return addr6_resolve_remote((struct sockaddr_in6 *) src_in,
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(struct sockaddr_in6 *) dst_in, addr);
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}
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static void process_req(struct work_struct *work)
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{
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struct addr_req *req, *temp_req;
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struct sockaddr *src_in, *dst_in;
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struct list_head done_list;
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INIT_LIST_HEAD(&done_list);
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mutex_lock(&lock);
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list_for_each_entry_safe(req, temp_req, &req_list, list) {
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if (req->status == -ENODATA) {
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src_in = (struct sockaddr *) &req->src_addr;
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dst_in = (struct sockaddr *) &req->dst_addr;
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req->status = addr_resolve_remote(src_in, dst_in,
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req->addr);
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if (req->status && time_after_eq(jiffies, req->timeout))
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req->status = -ETIMEDOUT;
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else if (req->status == -ENODATA)
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continue;
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}
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list_move_tail(&req->list, &done_list);
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}
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if (!list_empty(&req_list)) {
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req = list_entry(req_list.next, struct addr_req, list);
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set_timeout(req->timeout);
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}
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mutex_unlock(&lock);
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list_for_each_entry_safe(req, temp_req, &done_list, list) {
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list_del(&req->list);
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req->callback(req->status, (struct sockaddr *) &req->src_addr,
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req->addr, req->context);
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put_client(req->client);
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kfree(req);
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}
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}
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static int addr_resolve_local(struct sockaddr *src_in,
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struct sockaddr *dst_in,
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struct rdma_dev_addr *addr)
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{
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struct net_device *dev;
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int ret;
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switch (dst_in->sa_family) {
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case AF_INET:
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{
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__be32 src_ip = ((struct sockaddr_in *) src_in)->sin_addr.s_addr;
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__be32 dst_ip = ((struct sockaddr_in *) dst_in)->sin_addr.s_addr;
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dev = ip_dev_find(&init_net, dst_ip);
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if (!dev)
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return -EADDRNOTAVAIL;
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|
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||
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if (ipv4_is_zeronet(src_ip)) {
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src_in->sa_family = dst_in->sa_family;
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((struct sockaddr_in *) src_in)->sin_addr.s_addr = dst_ip;
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ret = rdma_copy_addr(addr, dev, dev->dev_addr);
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|
|
} else if (ipv4_is_loopback(src_ip)) {
|
||
|
|
ret = rdma_translate_ip(dst_in, addr);
|
||
|
|
if (!ret)
|
||
|
|
memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
|
||
|
|
} else {
|
||
|
|
ret = rdma_translate_ip(src_in, addr);
|
||
|
|
if (!ret)
|
||
|
|
memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
|
||
|
|
}
|
||
|
|
dev_put(dev);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
|
||
|
|
case AF_INET6:
|
||
|
|
{
|
||
|
|
struct in6_addr *a;
|
||
|
|
|
||
|
|
for_each_netdev(&init_net, dev)
|
||
|
|
if (ipv6_chk_addr(&init_net,
|
||
|
|
&((struct sockaddr_in6 *) dst_in)->sin6_addr,
|
||
|
|
dev, 1))
|
||
|
|
break;
|
||
|
|
|
||
|
|
if (!dev)
|
||
|
|
return -EADDRNOTAVAIL;
|
||
|
|
|
||
|
|
a = &((struct sockaddr_in6 *) src_in)->sin6_addr;
|
||
|
|
|
||
|
|
if (ipv6_addr_any(a)) {
|
||
|
|
src_in->sa_family = dst_in->sa_family;
|
||
|
|
((struct sockaddr_in6 *) src_in)->sin6_addr =
|
||
|
|
((struct sockaddr_in6 *) dst_in)->sin6_addr;
|
||
|
|
ret = rdma_copy_addr(addr, dev, dev->dev_addr);
|
||
|
|
} else if (ipv6_addr_loopback(a)) {
|
||
|
|
ret = rdma_translate_ip(dst_in, addr);
|
||
|
|
if (!ret)
|
||
|
|
memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
|
||
|
|
} else {
|
||
|
|
ret = rdma_translate_ip(src_in, addr);
|
||
|
|
if (!ret)
|
||
|
|
memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
default:
|
||
|
|
ret = -EADDRNOTAVAIL;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int rdma_resolve_ip(struct rdma_addr_client *client,
|
||
|
|
struct sockaddr *src_addr, struct sockaddr *dst_addr,
|
||
|
|
struct rdma_dev_addr *addr, int timeout_ms,
|
||
|
|
void (*callback)(int status, struct sockaddr *src_addr,
|
||
|
|
struct rdma_dev_addr *addr, void *context),
|
||
|
|
void *context)
|
||
|
|
{
|
||
|
|
struct sockaddr *src_in, *dst_in;
|
||
|
|
struct addr_req *req;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
req = kzalloc(sizeof *req, GFP_KERNEL);
|
||
|
|
if (!req)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
if (src_addr)
|
||
|
|
memcpy(&req->src_addr, src_addr, ip_addr_size(src_addr));
|
||
|
|
memcpy(&req->dst_addr, dst_addr, ip_addr_size(dst_addr));
|
||
|
|
req->addr = addr;
|
||
|
|
req->callback = callback;
|
||
|
|
req->context = context;
|
||
|
|
req->client = client;
|
||
|
|
atomic_inc(&client->refcount);
|
||
|
|
|
||
|
|
src_in = (struct sockaddr *) &req->src_addr;
|
||
|
|
dst_in = (struct sockaddr *) &req->dst_addr;
|
||
|
|
|
||
|
|
req->status = addr_resolve_local(src_in, dst_in, addr);
|
||
|
|
if (req->status == -EADDRNOTAVAIL)
|
||
|
|
req->status = addr_resolve_remote(src_in, dst_in, addr);
|
||
|
|
|
||
|
|
switch (req->status) {
|
||
|
|
case 0:
|
||
|
|
req->timeout = jiffies;
|
||
|
|
queue_req(req);
|
||
|
|
break;
|
||
|
|
case -ENODATA:
|
||
|
|
req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
|
||
|
|
queue_req(req);
|
||
|
|
addr_send_arp(dst_in);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
ret = req->status;
|
||
|
|
atomic_dec(&client->refcount);
|
||
|
|
kfree(req);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(rdma_resolve_ip);
|
||
|
|
|
||
|
|
void rdma_addr_cancel(struct rdma_dev_addr *addr)
|
||
|
|
{
|
||
|
|
struct addr_req *req, *temp_req;
|
||
|
|
|
||
|
|
mutex_lock(&lock);
|
||
|
|
list_for_each_entry_safe(req, temp_req, &req_list, list) {
|
||
|
|
if (req->addr == addr) {
|
||
|
|
req->status = -ECANCELED;
|
||
|
|
req->timeout = jiffies;
|
||
|
|
list_move(&req->list, &req_list);
|
||
|
|
set_timeout(req->timeout);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
mutex_unlock(&lock);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(rdma_addr_cancel);
|
||
|
|
|
||
|
|
static int netevent_callback(struct notifier_block *self, unsigned long event,
|
||
|
|
void *ctx)
|
||
|
|
{
|
||
|
|
if (event == NETEVENT_NEIGH_UPDATE) {
|
||
|
|
struct neighbour *neigh = ctx;
|
||
|
|
|
||
|
|
if (neigh->nud_state & NUD_VALID) {
|
||
|
|
set_timeout(jiffies);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct notifier_block nb = {
|
||
|
|
.notifier_call = netevent_callback
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init addr_init(void)
|
||
|
|
{
|
||
|
|
addr_wq = create_singlethread_workqueue("ib_addr");
|
||
|
|
if (!addr_wq)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
register_netevent_notifier(&nb);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit addr_cleanup(void)
|
||
|
|
{
|
||
|
|
unregister_netevent_notifier(&nb);
|
||
|
|
destroy_workqueue(addr_wq);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(addr_init);
|
||
|
|
module_exit(addr_cleanup);
|