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ng_ether: track interface renaming

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Also sanitize interface names that can potentially contain characters
that are prohibited in netgraph names.

PR:		kern/154850 (sanitizing of names)
Discussed with:	eri, melifaro
Submitted by:	Nikolay Denev <ndenev@gmail.com> (sanitizing code)
Reviewed by:	eri, glebius
MFC after:	17 days
This commit is contained in:
Andriy Gapon 2013-02-02 11:54:00 +00:00
parent 5583e07188
commit 499f60b10b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=246245
1 changed files with 56 additions and 4 deletions
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60
sys/netgraph/ng_ether.c
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@ -117,6 +117,8 @@ static ng_rcvdata_t ng_ether_rcvdata;
static ng_disconnect_t ng_ether_disconnect;
static int ng_ether_mod_event(module_t mod, int event, void *data);
static eventhandler_tag ng_ether_ifnet_arrival_cookie;
/* List of commands and how to convert arguments to/from ASCII */
static const struct ng_cmdlist ng_ether_cmdlist[] = {
{
@ -213,6 +215,24 @@ static struct ng_type ng_ether_typestruct = {
};
NETGRAPH_INIT(ether, &ng_ether_typestruct);
/******************************************************************
UTILITY FUNCTIONS
******************************************************************/
static void
ng_ether_sanitize_ifname(const char *ifname, char *name)
{
int i;
for (i = 0; i < IFNAMSIZ; i++) {
if (ifname[i] == '.' || ifname[i] == ':')
name[i] = '_';
else
name[i] = ifname[i];
if (name[i] == '\0')
break;
}
}
/******************************************************************
ETHERNET FUNCTION HOOKS
******************************************************************/
@ -282,6 +302,7 @@ ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
static void
ng_ether_attach(struct ifnet *ifp)
{
char name[IFNAMSIZ];
priv_p priv;
node_p node;
@ -319,10 +340,9 @@ ng_ether_attach(struct ifnet *ifp)
priv->hwassist = ifp->if_hwassist;
/* Try to give the node the same name as the interface */
if (ng_name_node(node, ifp->if_xname) != 0) {
log(LOG_WARNING, "%s: can't name node %s\n",
__func__, ifp->if_xname);
}
ng_ether_sanitize_ifname(ifp->if_xname, name);
if (ng_name_node(node, name) != 0)
log(LOG_WARNING, "%s: can't name node %s\n", __func__, name);
}
/*
@ -378,6 +398,32 @@ ng_ether_link_state(struct ifnet *ifp, int state)
}
}
/*
* Interface arrival notification handler.
* The notification is produced in two cases:
* o a new interface arrives
* o an existing interface got renamed
* Currently the first case is handled by ng_ether_attach via special
* hook ng_ether_attach_p.
*/
static void
ng_ether_ifnet_arrival_event(void *arg __unused, struct ifnet *ifp)
{
char name[IFNAMSIZ];
node_p node = IFP2NG(ifp);
/*
* Just return if it's a new interface without an ng_ether companion.
*/
if (node == NULL)
return;
/* Try to give the node the same name as the new interface name */
ng_ether_sanitize_ifname(ifp->if_xname, name);
if (ng_name_node(node, name) != 0)
log(LOG_WARNING, "%s: can't re-name node %s\n", __func__, name);
}
/******************************************************************
NETGRAPH NODE METHODS
******************************************************************/
@ -771,6 +817,9 @@ ng_ether_mod_event(module_t mod, int event, void *data)
ng_ether_input_orphan_p = ng_ether_input_orphan;
ng_ether_link_state_p = ng_ether_link_state;
ng_ether_ifnet_arrival_cookie =
EVENTHANDLER_REGISTER(ifnet_arrival_event,
ng_ether_ifnet_arrival_event, NULL, EVENTHANDLER_PRI_ANY);
break;
case MOD_UNLOAD:
@ -783,6 +832,9 @@ ng_ether_mod_event(module_t mod, int event, void *data)
* is MOD_UNLOAD, so there's no need to detach any nodes.
*/
EVENTHANDLER_DEREGISTER(ifnet_arrival_event,
ng_ether_ifnet_arrival_cookie);
/* Unregister function hooks */
ng_ether_attach_p = NULL;
ng_ether_detach_p = NULL;