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/*
* 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/workqueue.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>
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 struct delayed_work work;
static struct workqueue_struct *addr_wq;
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);
#ifdef __linux__
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;
}
#else
int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct ifnet *dev,
const unsigned char *dst_dev_addr)
{
if (dev->if_type == IFT_INFINIBAND)
dev_addr->dev_type = ARPHRD_INFINIBAND;
else if (dev->if_type == IFT_ETHER)
dev_addr->dev_type = ARPHRD_ETHER;
else
dev_addr->dev_type = 0;
memcpy(dev_addr->src_dev_addr, IF_LLADDR(dev), dev->if_addrlen);
memcpy(dev_addr->broadcast, __DECONST(char *, dev->if_broadcastaddr),
dev->if_addrlen);
if (dst_dev_addr)
memcpy(dev_addr->dst_dev_addr, dst_dev_addr, dev->if_addrlen);
dev_addr->bound_dev_if = dev->if_index;
return 0;
}
#endif
EXPORT_SYMBOL(rdma_copy_addr);
int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
{
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) {
#ifdef INET
case AF_INET:
dev = ip_dev_find(NULL,
((struct sockaddr_in *) addr)->sin_addr.s_addr);
if (!dev)
return ret;
ret = rdma_copy_addr(dev_addr, dev, NULL);
dev_put(dev);
break;
#endif
#if defined(INET6)
case AF_INET6:
#ifdef __linux__
read_lock(&dev_base_lock);
for_each_netdev(&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);
break;
}
}
read_unlock(&dev_base_lock);
#else
{
struct sockaddr_in6 *sin6;
struct ifaddr *ifa;
in_port_t port;
sin6 = (struct sockaddr_in6 *)addr;
port = sin6->sin6_port;
sin6->sin6_port = 0;
ifa = ifa_ifwithaddr(addr);
sin6->sin6_port = port;
if (ifa == NULL) {
ret = -ENODEV;
break;
}
ret = rdma_copy_addr(dev_addr, ifa->ifa_ifp, NULL);
ifa_free(ifa);
break;
}
#endif
break;
#endif
}
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_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);
}
#ifdef __linux__
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 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;
fl.oif = addr->bound_dev_if;
ret = ip_route_output_key(&init_net, &rt, &fl);
if (ret)
goto out;
src_in->sin_family = AF_INET;
src_in->sin_addr.s_addr = rt->rt_src;
if (rt->idev->dev->flags & IFF_LOOPBACK) {
ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
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->idev->dev->flags & IFF_NOARP) {
rdma_copy_addr(addr, rt->idev->dev, NULL);
goto put;
}
neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev);
if (!neigh || !(neigh->nud_state & NUD_VALID)) {
neigh_event_send(rt->u.dst.neighbour, NULL);
ret = -ENODATA;
if (neigh)
goto release;
goto put;
}
ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
release:
neigh_release(neigh);
put:
ip_rt_put(rt);
out:
return ret;
}
#if defined(INET6)
static int addr6_resolve(struct sockaddr_in6 *src_in,
struct sockaddr_in6 *dst_in,
struct rdma_dev_addr *addr)
{
struct flowi fl;
struct neighbour *neigh;
struct dst_entry *dst;
int ret;
memset(&fl, 0, sizeof fl);
ipv6_addr_copy(&fl.fl6_dst, &dst_in->sin6_addr);
ipv6_addr_copy(&fl.fl6_src, &src_in->sin6_addr);
fl.oif = addr->bound_dev_if;
dst = ip6_route_output(&init_net, NULL, &fl);
if ((ret = dst->error))
goto put;
if (ipv6_addr_any(&fl.fl6_src)) {
ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev,
&fl.fl6_dst, 0, &fl.fl6_src);
if (ret)
goto put;
src_in->sin6_family = AF_INET6;
ipv6_addr_copy(&src_in->sin6_addr, &fl.fl6_src);
}
if (dst->dev->flags & IFF_LOOPBACK) {
ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
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;
}
neigh = dst->neighbour;
if (!neigh || !(neigh->nud_state & NUD_VALID)) {
neigh_event_send(dst->neighbour, NULL);
ret = -ENODATA;
goto put;
}
ret = rdma_copy_addr(addr, dst->dev, neigh->ha);
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
#else
#include <netinet/if_ether.h>
static int addr_resolve(struct sockaddr *src_in,
struct sockaddr *dst_in,
struct rdma_dev_addr *addr)
{
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
struct ifaddr *ifa;
struct ifnet *ifp;
#if defined(INET) || defined(INET6)
struct llentry *lle;
#endif
struct rtentry *rte;
in_port_t port;
u_char edst[MAX_ADDR_LEN];
int multi;
int bcast;
int error = 0;
/*
* Determine whether the address is unicast, multicast, or broadcast
* and whether the source interface is valid.
*/
multi = 0;
bcast = 0;
sin = NULL;
sin6 = NULL;
ifp = NULL;
rte = NULL;
switch (dst_in->sa_family) {
#ifdef INET
case AF_INET:
sin = (struct sockaddr_in *)dst_in;
if (sin->sin_addr.s_addr == INADDR_BROADCAST)
bcast = 1;
if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
multi = 1;
sin = (struct sockaddr_in *)src_in;
if (sin->sin_addr.s_addr != INADDR_ANY) {
/*
* Address comparison fails if the port is set
* cache it here to be restored later.
*/
port = sin->sin_port;
sin->sin_port = 0;
memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
} else
src_in = NULL;
break;
#endif
#ifdef INET6
case AF_INET6:
sin6 = (struct sockaddr_in6 *)dst_in;
if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
multi = 1;
sin6 = (struct sockaddr_in6 *)src_in;
if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
port = sin6->sin6_port;
sin6->sin6_port = 0;
} else
src_in = NULL;
break;
#endif
default:
return -EINVAL;
}
/*
* If we have a source address to use look it up first and verify
* that it is a local interface.
*/
if (src_in) {
ifa = ifa_ifwithaddr(src_in);
if (sin)
sin->sin_port = port;
if (sin6)
sin6->sin6_port = port;
if (ifa == NULL)
return -ENETUNREACH;
ifp = ifa->ifa_ifp;
ifa_free(ifa);
if (bcast || multi)
goto mcast;
}
/*
* Make sure the route exists and has a valid link.
*/
rte = rtalloc1(dst_in, 1, 0);
if (rte == NULL || rte->rt_ifp == NULL || !RT_LINK_IS_UP(rte->rt_ifp)) {
if (rte)
RTFREE_LOCKED(rte);
return -EHOSTUNREACH;
}
/*
* If it's not multicast or broadcast and the route doesn't match the
* requested interface return unreachable. Otherwise fetch the
* correct interface pointer and unlock the route.
*/
if (multi || bcast) {
if (ifp == NULL)
ifp = rte->rt_ifp;
RTFREE_LOCKED(rte);
} else if (ifp && ifp != rte->rt_ifp) {
RTFREE_LOCKED(rte);
return -ENETUNREACH;
} else {
if (ifp == NULL)
ifp = rte->rt_ifp;
RT_UNLOCK(rte);
}
mcast:
if (bcast)
return rdma_copy_addr(addr, ifp, ifp->if_broadcastaddr);
if (multi) {
struct sockaddr *llsa;
error = ifp->if_resolvemulti(ifp, &llsa, dst_in);
if (error)
return -error;
error = rdma_copy_addr(addr, ifp,
LLADDR((struct sockaddr_dl *)llsa));
free(llsa, M_IFMADDR);
return error;
}
/*
* Resolve the link local address.
*/
switch (dst_in->sa_family) {
#ifdef INET
case AF_INET:
error = arpresolve(ifp, rte, NULL, dst_in, edst, &lle);
break;
#endif
#ifdef INET6
case AF_INET6:
error = nd6_storelladdr(ifp, NULL, dst_in, (u_char *)edst, &lle);
break;
#endif
default:
/* XXX: Shouldn't happen. */
error = -EINVAL;
}
RTFREE(rte);
if (error == 0)
return rdma_copy_addr(addr, ifp, edst);
if (error == EWOULDBLOCK)
return -ENODATA;
return -error;
}
#endif
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, ip_addr_size(src_addr));
} else {
src_in->sa_family = dst_addr->sa_family;
}
memcpy(dst_in, dst_addr, ip_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);
static int netevent_callback(struct notifier_block *self, unsigned long event,
void *ctx)
{
if (event == NETEVENT_NEIGH_UPDATE) {
#ifdef __linux__
struct neighbour *neigh = ctx;
if (neigh->nud_state & NUD_VALID) {
set_timeout(jiffies);
}
#else
set_timeout(jiffies);
#endif
}
return 0;
}
static struct notifier_block nb = {
.notifier_call = netevent_callback
};
static int 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);
return 0;
}
static void addr_cleanup(void)
{
unregister_netevent_notifier(&nb);
destroy_workqueue(addr_wq);
}
module_init(addr_init);
module_exit(addr_cleanup);
|