676 lines
16 KiB
C
676 lines
16 KiB
C
/*
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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/slab.h>
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#include <linux/workqueue.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <net/route.h>
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#include <net/netevent.h>
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#include <rdma/ib_addr.h>
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#include <netinet/if_ether.h>
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#include <netinet6/scope6_var.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 struct delayed_work work;
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static struct workqueue_struct *addr_wq;
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static struct rdma_addr_client self;
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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 ifnet *dev,
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const unsigned char *dst_dev_addr)
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{
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if (dev->if_type == IFT_INFINIBAND)
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dev_addr->dev_type = ARPHRD_INFINIBAND;
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else if (dev->if_type == IFT_ETHER)
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dev_addr->dev_type = ARPHRD_ETHER;
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else
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dev_addr->dev_type = 0;
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memcpy(dev_addr->src_dev_addr, IF_LLADDR(dev), dev->if_addrlen);
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memcpy(dev_addr->broadcast, __DECONST(char *, dev->if_broadcastaddr),
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dev->if_addrlen);
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if (dst_dev_addr)
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memcpy(dev_addr->dst_dev_addr, dst_dev_addr, dev->if_addrlen);
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dev_addr->bound_dev_if = dev->if_index;
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return 0;
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}
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EXPORT_SYMBOL(rdma_copy_addr);
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#define SCOPE_ID_CACHE(_scope_id, _addr6) do { \
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(_addr6)->sin6_addr.s6_addr[3] = (_scope_id); \
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(_addr6)->sin6_scope_id = 0; } while (0)
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#define SCOPE_ID_RESTORE(_scope_id, _addr6) do { \
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(_addr6)->sin6_scope_id = (_scope_id); \
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(_addr6)->sin6_addr.s6_addr[3] = 0; } while (0)
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int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr,
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u16 *vlan_id)
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{
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struct net_device *dev;
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int ret = -EADDRNOTAVAIL;
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if (dev_addr->bound_dev_if) {
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dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
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if (!dev)
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return -ENODEV;
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ret = rdma_copy_addr(dev_addr, dev, NULL);
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dev_put(dev);
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return ret;
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}
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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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if (vlan_id)
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*vlan_id = rdma_vlan_dev_vlan_id(dev);
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dev_put(dev);
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break;
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#if defined(INET6)
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case AF_INET6:
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{
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struct sockaddr_in6 *sin6;
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struct ifaddr *ifa;
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in_port_t port;
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uint32_t scope_id;
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sin6 = (struct sockaddr_in6 *)addr;
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port = sin6->sin6_port;
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sin6->sin6_port = 0;
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scope_id = sin6->sin6_scope_id;
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if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
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SCOPE_ID_CACHE(scope_id, sin6);
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ifa = ifa_ifwithaddr(addr);
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sin6->sin6_port = port;
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if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
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SCOPE_ID_RESTORE(scope_id, sin6);
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if (ifa == NULL) {
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ret = -ENODEV;
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break;
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}
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ret = rdma_copy_addr(dev_addr, ifa->ifa_ifp, NULL);
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if (vlan_id)
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*vlan_id = rdma_vlan_dev_vlan_id(ifa->ifa_ifp);
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ifa_free(ifa);
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break;
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}
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#endif
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default:
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break;
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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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delay = time - jiffies;
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if ((long)delay <= 0)
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delay = 1;
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mod_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 int addr_resolve(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 sockaddr_in *sin;
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struct sockaddr_in6 *sin6;
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struct ifaddr *ifa;
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struct ifnet *ifp;
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struct rtentry *rte;
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#if defined(INET) || defined(INET6)
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in_port_t port;
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#endif
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#ifdef INET6
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uint32_t scope_id;
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#endif
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u_char edst[MAX_ADDR_LEN];
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int multi;
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int bcast;
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int is_gw = 0;
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int error = 0;
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/*
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* Determine whether the address is unicast, multicast, or broadcast
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* and whether the source interface is valid.
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*/
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multi = 0;
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bcast = 0;
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sin = NULL;
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sin6 = NULL;
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ifp = NULL;
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rte = NULL;
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ifa = NULL;
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ifp = NULL;
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memset(edst, 0, sizeof(edst));
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#ifdef INET6
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scope_id = -1U;
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#endif
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switch (dst_in->sa_family) {
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#ifdef INET
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case AF_INET:
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sin = (struct sockaddr_in *)dst_in;
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if (sin->sin_addr.s_addr == INADDR_BROADCAST)
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bcast = 1;
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if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
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multi = 1;
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sin = (struct sockaddr_in *)src_in;
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if (sin->sin_addr.s_addr != INADDR_ANY) {
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/*
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* Address comparison fails if the port is set
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* cache it here to be restored later.
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*/
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port = sin->sin_port;
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sin->sin_port = 0;
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memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
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/*
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* If we have a source address to use look it
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* up first and verify that it is a local
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* interface:
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*/
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ifa = ifa_ifwithaddr(src_in);
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sin->sin_port = port;
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if (ifa == NULL) {
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error = ENETUNREACH;
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goto done;
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}
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ifp = ifa->ifa_ifp;
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ifa_free(ifa);
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if (bcast || multi)
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goto mcast;
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}
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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sin6 = (struct sockaddr_in6 *)dst_in;
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if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
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multi = 1;
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if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) {
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/*
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* The IB address comparison fails if the
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* scope ID is set and not part of the addr:
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*/
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scope_id = sin6->sin6_scope_id;
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if (scope_id < 256)
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SCOPE_ID_CACHE(scope_id, sin6);
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}
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sin6 = (struct sockaddr_in6 *)src_in;
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if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
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port = sin6->sin6_port;
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sin6->sin6_port = 0;
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if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) {
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if (scope_id < 256)
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SCOPE_ID_CACHE(scope_id, sin6);
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}
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/*
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* If we have a source address to use look it
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* up first and verify that it is a local
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* interface:
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*/
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ifa = ifa_ifwithaddr(src_in);
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sin6->sin6_port = port;
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if (ifa == NULL) {
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error = ENETUNREACH;
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goto done;
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}
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ifp = ifa->ifa_ifp;
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ifa_free(ifa);
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if (bcast || multi)
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goto mcast;
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}
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break;
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#endif
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default:
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error = EINVAL;
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goto done;
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}
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/*
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* Make sure the route exists and has a valid link.
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*/
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rte = rtalloc1(dst_in, 1, 0);
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if (rte == NULL || rte->rt_ifp == NULL || !RT_LINK_IS_UP(rte->rt_ifp)) {
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if (rte)
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RTFREE_LOCKED(rte);
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error = EHOSTUNREACH;
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goto done;
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}
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if (rte->rt_flags & RTF_GATEWAY)
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is_gw = 1;
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/*
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* If it's not multicast or broadcast and the route doesn't match the
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* requested interface return unreachable. Otherwise fetch the
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* correct interface pointer and unlock the route.
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*/
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if (multi || bcast) {
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if (ifp == NULL) {
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ifp = rte->rt_ifp;
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/* rt_ifa holds the route answer source address */
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ifa = rte->rt_ifa;
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}
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RTFREE_LOCKED(rte);
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} else if (ifp && ifp != rte->rt_ifp) {
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RTFREE_LOCKED(rte);
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error = ENETUNREACH;
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goto done;
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} else {
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if (ifp == NULL) {
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ifp = rte->rt_ifp;
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ifa = rte->rt_ifa;
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}
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RT_UNLOCK(rte);
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}
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#if defined(INET) || defined(INET6)
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mcast:
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#endif
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if (bcast) {
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memcpy(edst, ifp->if_broadcastaddr, ifp->if_addrlen);
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goto done;
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} else if (multi) {
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struct sockaddr *llsa;
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struct sockaddr_dl sdl;
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sdl.sdl_len = sizeof(sdl);
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llsa = (struct sockaddr *)&sdl;
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if (ifp->if_resolvemulti == NULL) {
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error = EOPNOTSUPP;
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goto done;
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}
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error = ifp->if_resolvemulti(ifp, &llsa, dst_in);
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if (error == 0) {
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memcpy(edst, LLADDR((struct sockaddr_dl *)llsa),
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ifp->if_addrlen);
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}
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goto done;
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}
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/*
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* Resolve the link local address.
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*/
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switch (dst_in->sa_family) {
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#ifdef INET
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case AF_INET:
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error = arpresolve(ifp, is_gw, NULL,
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is_gw ? rte->rt_gateway : dst_in, edst, NULL, NULL);
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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error = nd6_resolve(ifp, is_gw, NULL,
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is_gw ? rte->rt_gateway : dst_in, edst, NULL, NULL);
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break;
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#endif
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default:
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KASSERT(0, ("rdma_addr_resolve: Unreachable"));
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error = EINVAL;
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break;
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}
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RTFREE(rte);
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done:
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if (error == 0)
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error = -rdma_copy_addr(addr, ifp, edst);
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if (error == 0)
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memcpy(src_in, ifa->ifa_addr, ip_addr_size(ifa->ifa_addr));
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#ifdef INET6
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if (scope_id < 256) {
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sin6 = (struct sockaddr_in6 *)src_in;
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if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
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SCOPE_ID_RESTORE(scope_id, sin6);
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sin6 = (struct sockaddr_in6 *)dst_in;
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SCOPE_ID_RESTORE(scope_id, sin6);
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}
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#endif
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if (error == EWOULDBLOCK)
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error = ENODATA;
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return -error;
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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(src_in, dst_in, 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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int rdma_resolve_ip(struct rdma_addr_client *client,
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struct sockaddr *src_addr, struct sockaddr *dst_addr,
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struct rdma_dev_addr *addr, int timeout_ms,
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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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void *context)
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{
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struct sockaddr *src_in, *dst_in;
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struct addr_req *req;
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int ret = 0;
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req = kzalloc(sizeof *req, GFP_KERNEL);
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if (!req)
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return -ENOMEM;
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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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if (src_addr) {
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if (src_addr->sa_family != dst_addr->sa_family) {
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ret = -EINVAL;
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goto err;
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}
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memcpy(src_in, src_addr, ip_addr_size(src_addr));
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} else {
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src_in->sa_family = dst_addr->sa_family;
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}
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memcpy(dst_in, dst_addr, ip_addr_size(dst_addr));
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req->addr = addr;
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req->callback = callback;
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req->context = context;
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req->client = client;
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atomic_inc(&client->refcount);
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req->status = addr_resolve(src_in, dst_in, addr);
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switch (req->status) {
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case 0:
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req->timeout = jiffies;
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queue_req(req);
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break;
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case -ENODATA:
|
|
req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
|
|
queue_req(req);
|
|
break;
|
|
default:
|
|
ret = req->status;
|
|
atomic_dec(&client->refcount);
|
|
goto err;
|
|
}
|
|
return ret;
|
|
err:
|
|
kfree(req);
|
|
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);
|
|
|
|
struct resolve_cb_context {
|
|
struct rdma_dev_addr *addr;
|
|
struct completion comp;
|
|
};
|
|
|
|
static void resolve_cb(int status, struct sockaddr *src_addr,
|
|
struct rdma_dev_addr *addr, void *context)
|
|
{
|
|
memcpy(((struct resolve_cb_context *)context)->addr, addr, sizeof(struct
|
|
rdma_dev_addr));
|
|
complete(&((struct resolve_cb_context *)context)->comp);
|
|
}
|
|
|
|
int rdma_addr_find_dmac_by_grh(union ib_gid *sgid, union ib_gid *dgid, u8 *dmac,
|
|
u16 *vlan_id, u32 scope_id)
|
|
{
|
|
int ret = 0;
|
|
struct rdma_dev_addr dev_addr;
|
|
struct resolve_cb_context ctx;
|
|
struct net_device *dev;
|
|
|
|
union {
|
|
struct sockaddr _sockaddr;
|
|
struct sockaddr_in _sockaddr_in;
|
|
struct sockaddr_in6 _sockaddr_in6;
|
|
} sgid_addr, dgid_addr;
|
|
|
|
|
|
ret = rdma_gid2ip(&sgid_addr._sockaddr, sgid, scope_id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = rdma_gid2ip(&dgid_addr._sockaddr, dgid, scope_id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
memset(&dev_addr, 0, sizeof(dev_addr));
|
|
|
|
ctx.addr = &dev_addr;
|
|
init_completion(&ctx.comp);
|
|
ret = rdma_resolve_ip(&self, &sgid_addr._sockaddr, &dgid_addr._sockaddr,
|
|
&dev_addr, 1000, resolve_cb, &ctx);
|
|
if (ret)
|
|
return ret;
|
|
|
|
wait_for_completion(&ctx.comp);
|
|
|
|
memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
|
|
dev = dev_get_by_index(&init_net, dev_addr.bound_dev_if);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
if (vlan_id)
|
|
*vlan_id = rdma_vlan_dev_vlan_id(dev);
|
|
dev_put(dev);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(rdma_addr_find_dmac_by_grh);
|
|
|
|
u32 rdma_get_ipv6_scope_id(struct ib_device *ib, u8 port_num)
|
|
{
|
|
#ifdef INET6
|
|
struct ifnet *ifp;
|
|
if (ib->get_netdev == NULL)
|
|
return (-1U);
|
|
ifp = ib->get_netdev(ib, port_num);
|
|
if (ifp == NULL)
|
|
return (-1U);
|
|
return (in6_getscopezone(ifp, IPV6_ADDR_SCOPE_LINKLOCAL));
|
|
#else
|
|
return (-1U);
|
|
#endif
|
|
}
|
|
|
|
int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id,
|
|
u32 scope_id)
|
|
{
|
|
int ret = 0;
|
|
struct rdma_dev_addr dev_addr;
|
|
union {
|
|
struct sockaddr _sockaddr;
|
|
struct sockaddr_in _sockaddr_in;
|
|
struct sockaddr_in6 _sockaddr_in6;
|
|
} gid_addr;
|
|
|
|
ret = rdma_gid2ip(&gid_addr._sockaddr, sgid, scope_id);
|
|
if (ret)
|
|
return ret;
|
|
memset(&dev_addr, 0, sizeof(dev_addr));
|
|
ret = rdma_translate_ip(&gid_addr._sockaddr, &dev_addr, vlan_id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
memcpy(smac, dev_addr.src_dev_addr, ETH_ALEN);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(rdma_addr_find_smac_by_sgid);
|
|
|
|
static int netevent_callback(struct notifier_block *self, unsigned long event,
|
|
void *ctx)
|
|
{
|
|
if (event == NETEVENT_NEIGH_UPDATE) {
|
|
set_timeout(jiffies);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block nb = {
|
|
.notifier_call = netevent_callback
|
|
};
|
|
|
|
static int __init addr_init(void)
|
|
{
|
|
INIT_DELAYED_WORK(&work, process_req);
|
|
addr_wq = create_singlethread_workqueue("ib_addr");
|
|
if (!addr_wq)
|
|
return -ENOMEM;
|
|
|
|
register_netevent_notifier(&nb);
|
|
rdma_addr_register_client(&self);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit addr_cleanup(void)
|
|
{
|
|
rdma_addr_unregister_client(&self);
|
|
unregister_netevent_notifier(&nb);
|
|
destroy_workqueue(addr_wq);
|
|
}
|
|
|
|
module_init(addr_init);
|
|
module_exit(addr_cleanup);
|