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tipc: obtain node identity from interface by default 

Selecting and explicitly configuring a TIPC node identity may be
unwanted in some cases.

In this commit we introduce a default setting if the identity has not
been set at the moment the first bearer is enabled. We do this by
using a raw copy of a unique identifier from the used interface: MAC
address in the case of an L2 bearer, IPv4/IPv6 address in the case
of a UDP bearer.

Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Maloy 2018-03-22 20:42:52 +01:00 committed by David S. Miller
parent 25b0b9c4e8
commit 52dfae5c85
3 changed files with 29 additions and 9 deletions
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24
net/tipc/bearer.c
View File

@ -243,12 +243,6 @@ static int tipc_enable_bearer(struct net *net, const char *name,
int res = -EINVAL;
char *errstr = "";
if (!tipc_own_id(net)) {
errstr = "not supported in standalone mode";
res = -ENOPROTOOPT;
goto rejected;
}
if (!bearer_name_validate(name, &b_names)) {
errstr = "illegal name";
goto rejected;
@ -381,11 +375,13 @@ static void bearer_disable(struct net *net, struct tipc_bearer *b)
int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
struct nlattr *attr[])
{
char *dev_name = strchr((const char *)b->name, ':') + 1;
int hwaddr_len = b->media->hwaddr_len;
u8 node_id[NODE_ID_LEN] = {0,};
struct net_device *dev;
char *driver_name = strchr((const char *)b->name, ':') + 1;
/* Find device with specified name */
dev = dev_get_by_name(net, driver_name);
dev = dev_get_by_name(net, dev_name);
if (!dev)
return -ENODEV;
if (tipc_mtu_bad(dev, 0)) {
@ -393,6 +389,16 @@ int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
return -EINVAL;
}
/* Autoconfigure own node identity if needed */
if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
memcpy(node_id, dev->dev_addr, hwaddr_len);
tipc_net_init(net, node_id, 0);
}
if (!tipc_own_id(net)) {
pr_warn("Failed to obtain node identity\n");
return -EINVAL;
}
/* Associate TIPC bearer with L2 bearer */
rcu_assign_pointer(b->media_ptr, dev);
b->pt.dev = dev;
@ -400,7 +406,7 @@ int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
b->pt.func = tipc_l2_rcv_msg;
dev_add_pack(&b->pt);
memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
b->bcast_addr.media_id = b->media->type_id;
b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
b->mtu = dev->mtu;

1
net/tipc/net.h
View File

@ -41,6 +41,7 @@
extern const struct nla_policy tipc_nl_net_policy[];
int tipc_net_init(struct net *net, u8 *node_id, u32 addr);
void tipc_net_finalize(struct net *net, u32 addr);
void tipc_net_stop(struct net *net);
int tipc_nl_net_dump(struct sk_buff *skb, struct netlink_callback *cb);

13
net/tipc/udp_media.c
View File

@ -47,6 +47,8 @@
#include <net/addrconf.h>
#include <linux/tipc_netlink.h>
#include "core.h"
#include "addr.h"
#include "net.h"
#include "bearer.h"
#include "netlink.h"
#include "msg.h"
@ -647,6 +649,7 @@ static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
struct udp_port_cfg udp_conf = {0};
struct udp_tunnel_sock_cfg tuncfg = {NULL};
struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
u8 node_id[NODE_ID_LEN] = {0,};
ub = kzalloc(sizeof(*ub), GFP_ATOMIC);
if (!ub)
@ -677,6 +680,16 @@ static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
if (err)
goto err;
/* Autoconfigure own node identity if needed */
if (!tipc_own_id(net)) {
memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16);
tipc_net_init(net, node_id, 0);
}
if (!tipc_own_id(net)) {
pr_warn("Failed to set node id, please configure manually\n");
return -EINVAL;
}
b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;
b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
rcu_assign_pointer(b->media_ptr, ub);