| /* |
| * Copyright (c) 2005 Voltaire Inc. All rights reserved. |
| * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved. |
| * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved. |
| * Copyright (c) 2005 Intel Corporation. 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/mutex.h> |
| #include <linux/inetdevice.h> |
| #include <linux/slab.h> |
| #include <linux/workqueue.h> |
| #include <linux/module.h> |
| #include <net/arp.h> |
| #include <net/neighbour.h> |
| #include <net/route.h> |
| #include <net/netevent.h> |
| #include <net/addrconf.h> |
| #include <net/ip6_route.h> |
| #include <rdma/ib_addr.h> |
| #include <rdma/ib.h> |
| |
| MODULE_AUTHOR("Sean Hefty"); |
| MODULE_DESCRIPTION("IB Address Translation"); |
| MODULE_LICENSE("Dual BSD/GPL"); |
| |
| struct addr_req { |
| struct list_head list; |
| struct sockaddr_storage src_addr; |
| struct sockaddr_storage dst_addr; |
| struct rdma_dev_addr *addr; |
| struct rdma_addr_client *client; |
| void *context; |
| void (*callback)(int status, struct sockaddr *src_addr, |
| struct rdma_dev_addr *addr, void *context); |
| unsigned long timeout; |
| int status; |
| }; |
| |
| static void process_req(struct work_struct *work); |
| |
| static DEFINE_MUTEX(lock); |
| static LIST_HEAD(req_list); |
| static DECLARE_DELAYED_WORK(work, process_req); |
| static struct workqueue_struct *addr_wq; |
| |
| int rdma_addr_size(struct sockaddr *addr) |
| { |
| switch (addr->sa_family) { |
| case AF_INET: |
| return sizeof(struct sockaddr_in); |
| case AF_INET6: |
| return sizeof(struct sockaddr_in6); |
| case AF_IB: |
| return sizeof(struct sockaddr_ib); |
| default: |
| return 0; |
| } |
| } |
| EXPORT_SYMBOL(rdma_addr_size); |
| |
| static struct rdma_addr_client self; |
| |
| void rdma_addr_register_client(struct rdma_addr_client *client) |
| { |
| atomic_set(&client->refcount, 1); |
| init_completion(&client->comp); |
| } |
| EXPORT_SYMBOL(rdma_addr_register_client); |
| |
| static inline void put_client(struct rdma_addr_client *client) |
| { |
| if (atomic_dec_and_test(&client->refcount)) |
| complete(&client->comp); |
| } |
| |
| void rdma_addr_unregister_client(struct rdma_addr_client *client) |
| { |
| put_client(client); |
| wait_for_completion(&client->comp); |
| } |
| EXPORT_SYMBOL(rdma_addr_unregister_client); |
| |
| int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev, |
| const unsigned char *dst_dev_addr) |
| { |
| dev_addr->dev_type = dev->type; |
| memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN); |
| memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN); |
| if (dst_dev_addr) |
| memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN); |
| dev_addr->bound_dev_if = dev->ifindex; |
| return 0; |
| } |
| EXPORT_SYMBOL(rdma_copy_addr); |
| |
| int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr, |
| u16 *vlan_id) |
| { |
| struct net_device *dev; |
| int ret = -EADDRNOTAVAIL; |
| |
| if (dev_addr->bound_dev_if) { |
| dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if); |
| if (!dev) |
| return -ENODEV; |
| ret = rdma_copy_addr(dev_addr, dev, NULL); |
| dev_put(dev); |
| return ret; |
| } |
| |
| switch (addr->sa_family) { |
| case AF_INET: |
| dev = ip_dev_find(&init_net, |
| ((struct sockaddr_in *) addr)->sin_addr.s_addr); |
| |
| if (!dev) |
| return ret; |
| |
| ret = rdma_copy_addr(dev_addr, dev, NULL); |
| if (vlan_id) |
| *vlan_id = rdma_vlan_dev_vlan_id(dev); |
| dev_put(dev); |
| break; |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| case AF_INET6: |
| rcu_read_lock(); |
| for_each_netdev_rcu(&init_net, dev) { |
| if (ipv6_chk_addr(&init_net, |
| &((struct sockaddr_in6 *) addr)->sin6_addr, |
| dev, 1)) { |
| ret = rdma_copy_addr(dev_addr, dev, NULL); |
| if (vlan_id) |
| *vlan_id = rdma_vlan_dev_vlan_id(dev); |
| break; |
| } |
| } |
| rcu_read_unlock(); |
| break; |
| #endif |
| } |
| return ret; |
| } |
| EXPORT_SYMBOL(rdma_translate_ip); |
| |
| static void set_timeout(unsigned long time) |
| { |
| unsigned long delay; |
| |
| delay = time - jiffies; |
| if ((long)delay < 0) |
| delay = 0; |
| |
| mod_delayed_work(addr_wq, &work, delay); |
| } |
| |
| static void queue_req(struct addr_req *req) |
| { |
| struct addr_req *temp_req; |
| |
| mutex_lock(&lock); |
| list_for_each_entry_reverse(temp_req, &req_list, list) { |
| if (time_after_eq(req->timeout, temp_req->timeout)) |
| break; |
| } |
| |
| list_add(&req->list, &temp_req->list); |
| |
| if (req_list.next == &req->list) |
| set_timeout(req->timeout); |
| mutex_unlock(&lock); |
| } |
| |
| static int dst_fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr, void *daddr) |
| { |
| struct neighbour *n; |
| int ret; |
| |
| n = dst_neigh_lookup(dst, daddr); |
| |
| rcu_read_lock(); |
| if (!n || !(n->nud_state & NUD_VALID)) { |
| if (n) |
| neigh_event_send(n, NULL); |
| ret = -ENODATA; |
| } else { |
| ret = rdma_copy_addr(dev_addr, dst->dev, n->ha); |
| } |
| rcu_read_unlock(); |
| |
| if (n) |
| neigh_release(n); |
| |
| return ret; |
| } |
| |
| static int addr4_resolve(struct sockaddr_in *src_in, |
| struct sockaddr_in *dst_in, |
| struct rdma_dev_addr *addr) |
| { |
| __be32 src_ip = src_in->sin_addr.s_addr; |
| __be32 dst_ip = dst_in->sin_addr.s_addr; |
| struct rtable *rt; |
| struct flowi4 fl4; |
| int ret; |
| |
| memset(&fl4, 0, sizeof(fl4)); |
| fl4.daddr = dst_ip; |
| fl4.saddr = src_ip; |
| fl4.flowi4_oif = addr->bound_dev_if; |
| rt = ip_route_output_key(&init_net, &fl4); |
| if (IS_ERR(rt)) { |
| ret = PTR_ERR(rt); |
| goto out; |
| } |
| src_in->sin_family = AF_INET; |
| src_in->sin_addr.s_addr = fl4.saddr; |
| |
| if (rt->dst.dev->flags & IFF_LOOPBACK) { |
| ret = rdma_translate_ip((struct sockaddr *)dst_in, addr, NULL); |
| if (!ret) |
| memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN); |
| goto put; |
| } |
| |
| /* If the device does ARP internally, return 'done' */ |
| if (rt->dst.dev->flags & IFF_NOARP) { |
| ret = rdma_copy_addr(addr, rt->dst.dev, NULL); |
| goto put; |
| } |
| |
| ret = dst_fetch_ha(&rt->dst, addr, &fl4.daddr); |
| put: |
| ip_rt_put(rt); |
| out: |
| return ret; |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static int addr6_resolve(struct sockaddr_in6 *src_in, |
| struct sockaddr_in6 *dst_in, |
| struct rdma_dev_addr *addr) |
| { |
| struct flowi6 fl6; |
| struct dst_entry *dst; |
| int ret; |
| |
| memset(&fl6, 0, sizeof fl6); |
| fl6.daddr = dst_in->sin6_addr; |
| fl6.saddr = src_in->sin6_addr; |
| fl6.flowi6_oif = addr->bound_dev_if; |
| |
| dst = ip6_route_output(&init_net, NULL, &fl6); |
| if ((ret = dst->error)) |
| goto put; |
| |
| if (ipv6_addr_any(&fl6.saddr)) { |
| ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev, |
| &fl6.daddr, 0, &fl6.saddr); |
| if (ret) |
| goto put; |
| |
| src_in->sin6_family = AF_INET6; |
| src_in->sin6_addr = fl6.saddr; |
| } |
| |
| if (dst->dev->flags & IFF_LOOPBACK) { |
| ret = rdma_translate_ip((struct sockaddr *)dst_in, addr, NULL); |
| if (!ret) |
| memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN); |
| goto put; |
| } |
| |
| /* If the device does ARP internally, return 'done' */ |
| if (dst->dev->flags & IFF_NOARP) { |
| ret = rdma_copy_addr(addr, dst->dev, NULL); |
| goto put; |
| } |
| |
| ret = dst_fetch_ha(dst, addr, &fl6.daddr); |
| put: |
| dst_release(dst); |
| return ret; |
| } |
| #else |
| static int addr6_resolve(struct sockaddr_in6 *src_in, |
| struct sockaddr_in6 *dst_in, |
| struct rdma_dev_addr *addr) |
| { |
| return -EADDRNOTAVAIL; |
| } |
| #endif |
| |
| static int addr_resolve(struct sockaddr *src_in, |
| struct sockaddr *dst_in, |
| struct rdma_dev_addr *addr) |
| { |
| if (src_in->sa_family == AF_INET) { |
| return addr4_resolve((struct sockaddr_in *) src_in, |
| (struct sockaddr_in *) dst_in, addr); |
| } else |
| return addr6_resolve((struct sockaddr_in6 *) src_in, |
| (struct sockaddr_in6 *) dst_in, addr); |
| } |
| |
| static void process_req(struct work_struct *work) |
| { |
| struct addr_req *req, *temp_req; |
| struct sockaddr *src_in, *dst_in; |
| struct list_head done_list; |
| |
| INIT_LIST_HEAD(&done_list); |
| |
| mutex_lock(&lock); |
| list_for_each_entry_safe(req, temp_req, &req_list, list) { |
| if (req->status == -ENODATA) { |
| src_in = (struct sockaddr *) &req->src_addr; |
| dst_in = (struct sockaddr *) &req->dst_addr; |
| req->status = addr_resolve(src_in, dst_in, req->addr); |
| if (req->status && time_after_eq(jiffies, req->timeout)) |
| req->status = -ETIMEDOUT; |
| else if (req->status == -ENODATA) |
| continue; |
| } |
| list_move_tail(&req->list, &done_list); |
| } |
| |
| if (!list_empty(&req_list)) { |
| req = list_entry(req_list.next, struct addr_req, list); |
| set_timeout(req->timeout); |
| } |
| mutex_unlock(&lock); |
| |
| list_for_each_entry_safe(req, temp_req, &done_list, list) { |
| list_del(&req->list); |
| req->callback(req->status, (struct sockaddr *) &req->src_addr, |
| req->addr, req->context); |
| put_client(req->client); |
| kfree(req); |
| } |
| } |
| |
| 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; |
| |
| src_in = (struct sockaddr *) &req->src_addr; |
| dst_in = (struct sockaddr *) &req->dst_addr; |
| |
| if (src_addr) { |
| if (src_addr->sa_family != dst_addr->sa_family) { |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| memcpy(src_in, src_addr, rdma_addr_size(src_addr)); |
| } else { |
| src_in->sa_family = dst_addr->sa_family; |
| } |
| |
| memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr)); |
| req->addr = addr; |
| req->callback = callback; |
| req->context = context; |
| req->client = client; |
| atomic_inc(&client->refcount); |
| |
| req->status = addr_resolve(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); |
| 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(const union ib_gid *sgid, const union ib_gid *dgid, |
| u8 *dmac, u16 *vlan_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; |
| |
| |
| rdma_gid2ip(&sgid_addr._sockaddr, sgid); |
| rdma_gid2ip(&dgid_addr._sockaddr, dgid); |
| |
| 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); |
| |
| int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_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; |
| |
| rdma_gid2ip(&gid_addr._sockaddr, sgid); |
| |
| 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) { |
| 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); |
| 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); |