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RDMA/addr: Add support for translating IPv6 addresses
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Add support for translating AF_INET6 addresses to the IB address
translation service.  This requires using struct sockaddr_storage
instead of struct sockaddr wherever an IPv6 address might be stored,
and adding cases to handle IPv6 in addition to IPv4 to the various
translation functions.

Signed-off-by: Aleksey Senin <aleksey@alst60.(none)>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
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Aleksey Senin authored and Roland Dreier committed Dec 24, 2008
1 parent 061e41f commit 38617c6
Showing 1 changed file with 151 additions and 45 deletions.
196 changes: 151 additions & 45 deletions drivers/infiniband/core/addr.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,8 @@
#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");
Expand All @@ -49,8 +51,8 @@ MODULE_LICENSE("Dual BSD/GPL");

struct addr_req {
struct list_head list;
struct sockaddr src_addr;
struct sockaddr dst_addr;
struct sockaddr_storage src_addr;
struct sockaddr_storage dst_addr;
struct rdma_dev_addr *addr;
struct rdma_addr_client *client;
void *context;
Expand Down Expand Up @@ -113,15 +115,32 @@ EXPORT_SYMBOL(rdma_copy_addr);
int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
{
struct net_device *dev;
__be32 ip = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
int ret;
int ret = -EADDRNOTAVAIL;

dev = ip_dev_find(&init_net, ip);
if (!dev)
return -EADDRNOTAVAIL;
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);
dev_put(dev);
ret = rdma_copy_addr(dev_addr, dev, NULL);
dev_put(dev);
break;
case AF_INET6:
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;
}
}
break;
default:
break;
}
return ret;
}
EXPORT_SYMBOL(rdma_translate_ip);
Expand Down Expand Up @@ -156,22 +175,37 @@ static void queue_req(struct addr_req *req)
mutex_unlock(&lock);
}

static void addr_send_arp(struct sockaddr_in *dst_in)
static void addr_send_arp(struct sockaddr *dst_in)
{
struct rtable *rt;
struct flowi fl;
__be32 dst_ip = dst_in->sin_addr.s_addr;
struct dst_entry *dst;

memset(&fl, 0, sizeof fl);
fl.nl_u.ip4_u.daddr = dst_ip;
if (ip_route_output_key(&init_net, &rt, &fl))
return;
if (dst_in->sa_family == AF_INET) {
fl.nl_u.ip4_u.daddr =
((struct sockaddr_in *) dst_in)->sin_addr.s_addr;

neigh_event_send(rt->u.dst.neighbour, NULL);
ip_rt_put(rt);
if (ip_route_output_key(&init_net, &rt, &fl))
return;

neigh_event_send(rt->u.dst.neighbour, NULL);
ip_rt_put(rt);

} else {
fl.nl_u.ip6_u.daddr =
((struct sockaddr_in6 *) dst_in)->sin6_addr;

dst = ip6_route_output(&init_net, NULL, &fl);
if (!dst)
return;

neigh_event_send(dst->neighbour, NULL);
dst_release(dst);
}
}

static int addr_resolve_remote(struct sockaddr_in *src_in,
static int addr4_resolve_remote(struct sockaddr_in *src_in,
struct sockaddr_in *dst_in,
struct rdma_dev_addr *addr)
{
Expand Down Expand Up @@ -220,19 +254,60 @@ static int addr_resolve_remote(struct sockaddr_in *src_in,
return ret;
}

static int addr6_resolve_remote(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 = -ENODATA;

memset(&fl, 0, sizeof fl);
fl.nl_u.ip6_u.daddr = dst_in->sin6_addr;
fl.nl_u.ip6_u.saddr = src_in->sin6_addr;

dst = ip6_route_output(&init_net, NULL, &fl);
if (!dst)
return ret;

if (dst->dev->flags & IFF_NOARP) {
ret = rdma_copy_addr(addr, dst->dev, NULL);
} else {
neigh = dst->neighbour;
if (neigh && (neigh->nud_state & NUD_VALID))
ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
}

dst_release(dst);
return ret;
}

static int addr_resolve_remote(struct sockaddr *src_in,
struct sockaddr *dst_in,
struct rdma_dev_addr *addr)
{
if (src_in->sa_family == AF_INET) {
return addr4_resolve_remote((struct sockaddr_in *) src_in,
(struct sockaddr_in *) dst_in, addr);
} else
return addr6_resolve_remote((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_in *src_in, *dst_in;
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_in *) &req->src_addr;
dst_in = (struct sockaddr_in *) &req->dst_addr;
src_in = (struct sockaddr *) &req->src_addr;
dst_in = (struct sockaddr *) &req->dst_addr;
req->status = addr_resolve_remote(src_in, dst_in,
req->addr);
if (req->status && time_after_eq(jiffies, req->timeout))
Expand All @@ -251,41 +326,72 @@ static void process_req(struct work_struct *work)

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);
req->callback(req->status, (struct sockaddr *) &req->src_addr,
req->addr, req->context);
put_client(req->client);
kfree(req);
}
}

static int addr_resolve_local(struct sockaddr_in *src_in,
struct sockaddr_in *dst_in,
static int addr_resolve_local(struct sockaddr *src_in,
struct sockaddr *dst_in,
struct rdma_dev_addr *addr)
{
struct net_device *dev;
__be32 src_ip = src_in->sin_addr.s_addr;
__be32 dst_ip = dst_in->sin_addr.s_addr;
int ret;

dev = ip_dev_find(&init_net, dst_ip);
if (!dev)
return -EADDRNOTAVAIL;

if (ipv4_is_zeronet(src_ip)) {
src_in->sin_family = dst_in->sin_family;
src_in->sin_addr.s_addr = dst_ip;
ret = rdma_copy_addr(addr, dev, dev->dev_addr);
} else if (ipv4_is_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);
if (dst_in->sa_family == AF_INET) {
__be32 src_ip = ((struct sockaddr_in *) src_in)->sin_addr.s_addr;
__be32 dst_ip = ((struct sockaddr_in *) dst_in)->sin_addr.s_addr;

dev = ip_dev_find(&init_net, dst_ip);
if (!dev)
return -EADDRNOTAVAIL;

if (ipv4_is_zeronet(src_ip)) {
src_in->sa_family = dst_in->sa_family;
((struct sockaddr_in *) src_in)->sin_addr.s_addr = dst_ip;
ret = rdma_copy_addr(addr, dev, dev->dev_addr);
} 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);
} else {
ret = rdma_translate_ip((struct sockaddr *)src_in, addr);
if (!ret)
memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
struct in6_addr *a;

for_each_netdev(&init_net, dev)
if (ipv6_chk_addr(&init_net,
&((struct sockaddr_in6 *) addr)->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);
}
}

dev_put(dev);
return ret;
}

Expand All @@ -296,7 +402,7 @@ int rdma_resolve_ip(struct rdma_addr_client *client,
struct rdma_dev_addr *addr, void *context),
void *context)
{
struct sockaddr_in *src_in, *dst_in;
struct sockaddr *src_in, *dst_in;
struct addr_req *req;
int ret = 0;

Expand All @@ -313,8 +419,8 @@ int rdma_resolve_ip(struct rdma_addr_client *client,
req->client = client;
atomic_inc(&client->refcount);

src_in = (struct sockaddr_in *) &req->src_addr;
dst_in = (struct sockaddr_in *) &req->dst_addr;
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)
Expand Down

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