RDMA/cma: Bind to a specific address family
The RDMA CM uses a single port space for all associated (tcp, udp,
etc.) port bindings, regardless of the address family that the user
binds to. The result is that if a user binds to AF_INET, but does not
specify an IP address, the bind will occur for AF_INET6. This causes
an attempt to bind to the same port using AF_INET6 to fail, and
connection requests to AF_INET6 will match with the AF_INET listener.
Align the behavior with sockets and restrict the bind to AF_INET only.
If a user binds to AF_INET6, we bind the port to AF_INET6 and
AF_INET depending on the value of bindv6only.
Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 2e826f9..c10c45a 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -140,6 +140,7 @@
u8 srq;
u8 tos;
u8 reuseaddr;
+ u8 afonly;
};
struct cma_multicast {
@@ -1573,6 +1574,7 @@
list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
atomic_inc(&id_priv->refcount);
dev_id_priv->internal_id = 1;
+ dev_id_priv->afonly = id_priv->afonly;
ret = rdma_listen(id, id_priv->backlog);
if (ret)
@@ -2187,22 +2189,24 @@
struct hlist_node *node;
addr = (struct sockaddr *) &id_priv->id.route.addr.src_addr;
- if (cma_any_addr(addr) && !reuseaddr)
- return -EADDRNOTAVAIL;
-
hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
if (id_priv == cur_id)
continue;
- if ((cur_id->state == RDMA_CM_LISTEN) ||
- !reuseaddr || !cur_id->reuseaddr) {
- cur_addr = (struct sockaddr *) &cur_id->id.route.addr.src_addr;
- if (cma_any_addr(cur_addr))
- return -EADDRNOTAVAIL;
+ if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
+ cur_id->reuseaddr)
+ continue;
- if (!cma_addr_cmp(addr, cur_addr))
- return -EADDRINUSE;
- }
+ cur_addr = (struct sockaddr *) &cur_id->id.route.addr.src_addr;
+ if (id_priv->afonly && cur_id->afonly &&
+ (addr->sa_family != cur_addr->sa_family))
+ continue;
+
+ if (cma_any_addr(addr) || cma_any_addr(cur_addr))
+ return -EADDRNOTAVAIL;
+
+ if (!cma_addr_cmp(addr, cur_addr))
+ return -EADDRINUSE;
}
return 0;
}
@@ -2371,6 +2375,12 @@
}
memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
+ if (addr->sa_family == AF_INET)
+ id_priv->afonly = 1;
+#if IS_ENABLED(CONFIG_IPV6)
+ else if (addr->sa_family == AF_INET6)
+ id_priv->afonly = init_net.ipv6.sysctl.bindv6only;
+#endif
ret = cma_get_port(id_priv);
if (ret)
goto err2;