![Tom Tucker](/assets/img/avatar_default.png)
Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Signed-off-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: David S. Miller <davem@davemloft.net>
366 lines
8.7 KiB
C
366 lines
8.7 KiB
C
/*
|
|
* 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 licensed under one of the following licenses:
|
|
*
|
|
* 1) under the terms of the "Common Public License 1.0" a copy of which is
|
|
* available from the Open Source Initiative, see
|
|
* http://www.opensource.org/licenses/cpl.php.
|
|
*
|
|
* 2) under the terms of the "The BSD License" a copy of which is
|
|
* available from the Open Source Initiative, see
|
|
* http://www.opensource.org/licenses/bsd-license.php.
|
|
*
|
|
* 3) under the terms of the "GNU General Public License (GPL) Version 2" a
|
|
* copy of which is available from the Open Source Initiative, see
|
|
* http://www.opensource.org/licenses/gpl-license.php.
|
|
*
|
|
* Licensee has the right to choose one of the above licenses.
|
|
*
|
|
* Redistributions of source code must retain the above copyright
|
|
* notice and one of the license notices.
|
|
*
|
|
* Redistributions in binary form must reproduce both the above copyright
|
|
* notice, one of the license notices in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*/
|
|
|
|
#include <linux/mutex.h>
|
|
#include <linux/inetdevice.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/if_arp.h>
|
|
#include <net/arp.h>
|
|
#include <net/neighbour.h>
|
|
#include <net/route.h>
|
|
#include <net/netevent.h>
|
|
#include <rdma/ib_addr.h>
|
|
|
|
MODULE_AUTHOR("Sean Hefty");
|
|
MODULE_DESCRIPTION("IB Address Translation");
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
|
|
struct addr_req {
|
|
struct list_head list;
|
|
struct sockaddr src_addr;
|
|
struct sockaddr dst_addr;
|
|
struct rdma_dev_addr *addr;
|
|
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(void *data);
|
|
|
|
static DEFINE_MUTEX(lock);
|
|
static LIST_HEAD(req_list);
|
|
static DECLARE_WORK(work, process_req, NULL);
|
|
static struct workqueue_struct *addr_wq;
|
|
|
|
static int copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
|
|
unsigned char *dst_dev_addr)
|
|
{
|
|
switch (dev->type) {
|
|
case ARPHRD_INFINIBAND:
|
|
dev_addr->dev_type = IB_NODE_CA;
|
|
break;
|
|
default:
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
|
|
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);
|
|
return 0;
|
|
}
|
|
|
|
int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
|
|
{
|
|
struct net_device *dev;
|
|
u32 ip = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
|
|
int ret;
|
|
|
|
dev = ip_dev_find(ip);
|
|
if (!dev)
|
|
return -EADDRNOTAVAIL;
|
|
|
|
ret = copy_addr(dev_addr, dev, NULL);
|
|
dev_put(dev);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(rdma_translate_ip);
|
|
|
|
static void set_timeout(unsigned long time)
|
|
{
|
|
unsigned long delay;
|
|
|
|
cancel_delayed_work(&work);
|
|
|
|
delay = time - jiffies;
|
|
if ((long)delay <= 0)
|
|
delay = 1;
|
|
|
|
queue_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(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 void addr_send_arp(struct sockaddr_in *dst_in)
|
|
{
|
|
struct rtable *rt;
|
|
struct flowi fl;
|
|
u32 dst_ip = dst_in->sin_addr.s_addr;
|
|
|
|
memset(&fl, 0, sizeof fl);
|
|
fl.nl_u.ip4_u.daddr = dst_ip;
|
|
if (ip_route_output_key(&rt, &fl))
|
|
return;
|
|
|
|
arp_send(ARPOP_REQUEST, ETH_P_ARP, rt->rt_gateway, rt->idev->dev,
|
|
rt->rt_src, NULL, rt->idev->dev->dev_addr, NULL);
|
|
ip_rt_put(rt);
|
|
}
|
|
|
|
static int addr_resolve_remote(struct sockaddr_in *src_in,
|
|
struct sockaddr_in *dst_in,
|
|
struct rdma_dev_addr *addr)
|
|
{
|
|
u32 src_ip = src_in->sin_addr.s_addr;
|
|
u32 dst_ip = dst_in->sin_addr.s_addr;
|
|
struct flowi fl;
|
|
struct rtable *rt;
|
|
struct neighbour *neigh;
|
|
int ret;
|
|
|
|
memset(&fl, 0, sizeof fl);
|
|
fl.nl_u.ip4_u.daddr = dst_ip;
|
|
fl.nl_u.ip4_u.saddr = src_ip;
|
|
ret = ip_route_output_key(&rt, &fl);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* If the device does ARP internally, return 'done' */
|
|
if (rt->idev->dev->flags & IFF_NOARP) {
|
|
copy_addr(addr, rt->idev->dev, NULL);
|
|
goto put;
|
|
}
|
|
|
|
neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev);
|
|
if (!neigh) {
|
|
ret = -ENODATA;
|
|
goto put;
|
|
}
|
|
|
|
if (!(neigh->nud_state & NUD_VALID)) {
|
|
ret = -ENODATA;
|
|
goto release;
|
|
}
|
|
|
|
if (!src_ip) {
|
|
src_in->sin_family = dst_in->sin_family;
|
|
src_in->sin_addr.s_addr = rt->rt_src;
|
|
}
|
|
|
|
ret = copy_addr(addr, neigh->dev, neigh->ha);
|
|
release:
|
|
neigh_release(neigh);
|
|
put:
|
|
ip_rt_put(rt);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void process_req(void *data)
|
|
{
|
|
struct addr_req *req, *temp_req;
|
|
struct sockaddr_in *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) {
|
|
src_in = (struct sockaddr_in *) &req->src_addr;
|
|
dst_in = (struct sockaddr_in *) &req->dst_addr;
|
|
req->status = addr_resolve_remote(src_in, dst_in,
|
|
req->addr);
|
|
}
|
|
if (req->status && time_after(jiffies, req->timeout))
|
|
req->status = -ETIMEDOUT;
|
|
else if (req->status == -ENODATA)
|
|
continue;
|
|
|
|
list_del(&req->list);
|
|
list_add_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, &req->src_addr, req->addr,
|
|
req->context);
|
|
kfree(req);
|
|
}
|
|
}
|
|
|
|
static int addr_resolve_local(struct sockaddr_in *src_in,
|
|
struct sockaddr_in *dst_in,
|
|
struct rdma_dev_addr *addr)
|
|
{
|
|
struct net_device *dev;
|
|
u32 src_ip = src_in->sin_addr.s_addr;
|
|
u32 dst_ip = dst_in->sin_addr.s_addr;
|
|
int ret;
|
|
|
|
dev = ip_dev_find(dst_ip);
|
|
if (!dev)
|
|
return -EADDRNOTAVAIL;
|
|
|
|
if (ZERONET(src_ip)) {
|
|
src_in->sin_family = dst_in->sin_family;
|
|
src_in->sin_addr.s_addr = dst_ip;
|
|
ret = copy_addr(addr, dev, dev->dev_addr);
|
|
} else if (LOOPBACK(src_ip)) {
|
|
ret = rdma_translate_ip((struct sockaddr *)dst_in, addr);
|
|
if (!ret)
|
|
memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
|
|
} else {
|
|
ret = rdma_translate_ip((struct sockaddr *)src_in, addr);
|
|
if (!ret)
|
|
memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
|
|
}
|
|
|
|
dev_put(dev);
|
|
return ret;
|
|
}
|
|
|
|
int rdma_resolve_ip(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_in *src_in, *dst_in;
|
|
struct addr_req *req;
|
|
int ret = 0;
|
|
|
|
req = kmalloc(sizeof *req, GFP_KERNEL);
|
|
if (!req)
|
|
return -ENOMEM;
|
|
memset(req, 0, sizeof *req);
|
|
|
|
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;
|
|
|
|
src_in = (struct sockaddr_in *) &req->src_addr;
|
|
dst_in = (struct sockaddr_in *) &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;
|
|
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_del(&req->list);
|
|
list_add(&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->dev->type == ARPHRD_INFINIBAND &&
|
|
(neigh->nud_state & NUD_VALID)) {
|
|
set_timeout(jiffies);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block nb = {
|
|
.notifier_call = netevent_callback
|
|
};
|
|
|
|
static int addr_init(void)
|
|
{
|
|
addr_wq = create_singlethread_workqueue("ib_addr_wq");
|
|
if (!addr_wq)
|
|
return -ENOMEM;
|
|
|
|
register_netevent_notifier(&nb);
|
|
return 0;
|
|
}
|
|
|
|
static void addr_cleanup(void)
|
|
{
|
|
unregister_netevent_notifier(&nb);
|
|
destroy_workqueue(addr_wq);
|
|
}
|
|
|
|
module_init(addr_init);
|
|
module_exit(addr_cleanup);
|