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Make ipfw nat init/unint work correctly for VIMAGE:

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* Do per vnet instance cleanup (previously it was only for vnet0 on
  module unload, and led to libalias leaks and possible panics due to
  stale pointer dereferences).

* Instead of protecting ipfw hooks registering/deregistering by only
  vnet0 lock (which does not prevent pointers access from another
  vnets), introduce per vnet ipfw_nat_loaded variable. The variable is
  set after hooks are registered and unset before they are deregistered.

* Devirtualize ifaddr_event_tag as we run only one event handler for
  all vnets.

* It is supposed that ifaddr_change event handler is called in the
  interface vnet context, so add an assertion.

Reviewed by:	zec
MFC after:	2 weeks
This commit is contained in:
Mikolaj Golub 2013-08-24 11:59:51 +00:00
parent 2c4e923de2
commit 8856400bcb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=254776
3 changed files with 59 additions and 25 deletions
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2
sys/netpfil/ipfw/ip_fw2.c
View file

@ -142,6 +142,8 @@ VNET_DEFINE(int, verbose_limit);
/* layer3_chain contains the list of rules for layer 3 */
VNET_DEFINE(struct ip_fw_chain, layer3_chain);
VNET_DEFINE(int, ipfw_nat_ready) = 0;
ipfw_nat_t *ipfw_nat_ptr = NULL;
struct cfg_nat *(*lookup_nat_ptr)(struct nat_list *, int);
ipfw_nat_cfg_t *ipfw_nat_cfg_ptr;

76
sys/netpfil/ipfw/ip_fw_nat.c
View file

@ -53,8 +53,7 @@ __FBSDID("$FreeBSD$");
#include <machine/in_cksum.h> /* XXX for in_cksum */
static VNET_DEFINE(eventhandler_tag, ifaddr_event_tag);
#define V_ifaddr_event_tag VNET(ifaddr_event_tag)
static eventhandler_tag ifaddr_event_tag;
static void
ifaddr_change(void *arg __unused, struct ifnet *ifp)
@ -63,6 +62,8 @@ ifaddr_change(void *arg __unused, struct ifnet *ifp)
struct ifaddr *ifa;
struct ip_fw_chain *chain;
KASSERT(curvnet == ifp->if_vnet,
("curvnet(%p) differs from iface vnet(%p)", curvnet, ifp->if_vnet));
chain = &V_layer3_chain;
IPFW_WLOCK(chain);
/* Check every nat entry... */
@ -589,26 +590,16 @@ ipfw_nat_get_log(struct sockopt *sopt)
return(0);
}
static void
ipfw_nat_init(void)
static int
vnet_ipfw_nat_init(const void *arg __unused)
{
IPFW_WLOCK(&V_layer3_chain);
/* init ipfw hooks */
ipfw_nat_ptr = ipfw_nat;
lookup_nat_ptr = lookup_nat;
ipfw_nat_cfg_ptr = ipfw_nat_cfg;
ipfw_nat_del_ptr = ipfw_nat_del;
ipfw_nat_get_cfg_ptr = ipfw_nat_get_cfg;
ipfw_nat_get_log_ptr = ipfw_nat_get_log;
IPFW_WUNLOCK(&V_layer3_chain);
V_ifaddr_event_tag = EVENTHANDLER_REGISTER(
ifaddr_event, ifaddr_change,
NULL, EVENTHANDLER_PRI_ANY);
V_ipfw_nat_ready = 1;
return (0);
}
static void
ipfw_nat_destroy(void)
static int
vnet_ipfw_nat_uninit(const void *arg __unused)
{
struct cfg_nat *ptr, *ptr_temp;
struct ip_fw_chain *chain;
@ -621,8 +612,33 @@ ipfw_nat_destroy(void)
LibAliasUninit(ptr->lib);
free(ptr, M_IPFW);
}
EVENTHANDLER_DEREGISTER(ifaddr_event, V_ifaddr_event_tag);
flush_nat_ptrs(chain, -1 /* flush all */);
V_ipfw_nat_ready = 0;
IPFW_WUNLOCK(chain);
return (0);
}
static void
ipfw_nat_init(void)
{
/* init ipfw hooks */
ipfw_nat_ptr = ipfw_nat;
lookup_nat_ptr = lookup_nat;
ipfw_nat_cfg_ptr = ipfw_nat_cfg;
ipfw_nat_del_ptr = ipfw_nat_del;
ipfw_nat_get_cfg_ptr = ipfw_nat_get_cfg;
ipfw_nat_get_log_ptr = ipfw_nat_get_log;
ifaddr_event_tag = EVENTHANDLER_REGISTER(ifaddr_event, ifaddr_change,
NULL, EVENTHANDLER_PRI_ANY);
}
static void
ipfw_nat_destroy(void)
{
EVENTHANDLER_DEREGISTER(ifaddr_event, ifaddr_event_tag);
/* deregister ipfw_nat */
ipfw_nat_ptr = NULL;
lookup_nat_ptr = NULL;
@ -630,7 +646,6 @@ ipfw_nat_destroy(void)
ipfw_nat_del_ptr = NULL;
ipfw_nat_get_cfg_ptr = NULL;
ipfw_nat_get_log_ptr = NULL;
IPFW_WUNLOCK(chain);
}
static int
@ -640,11 +655,9 @@ ipfw_nat_modevent(module_t mod, int type, void *unused)
switch (type) {
case MOD_LOAD:
ipfw_nat_init();
break;
case MOD_UNLOAD:
ipfw_nat_destroy();
break;
default:
@ -660,8 +673,25 @@ static moduledata_t ipfw_nat_mod = {
0
};
DECLARE_MODULE(ipfw_nat, ipfw_nat_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
/* Define startup order. */
#define IPFW_NAT_SI_SUB_FIREWALL SI_SUB_PROTO_IFATTACHDOMAIN
#define IPFW_NAT_MODEVENT_ORDER (SI_ORDER_ANY - 255)
#define IPFW_NAT_MODULE_ORDER (IPFW_NAT_MODEVENT_ORDER + 1)
#define IPFW_NAT_VNET_ORDER (IPFW_NAT_MODEVENT_ORDER + 2)
DECLARE_MODULE(ipfw_nat, ipfw_nat_mod, IPFW_NAT_SI_SUB_FIREWALL, SI_ORDER_ANY);
MODULE_DEPEND(ipfw_nat, libalias, 1, 1, 1);
MODULE_DEPEND(ipfw_nat, ipfw, 2, 2, 2);
MODULE_VERSION(ipfw_nat, 1);
SYSINIT(ipfw_nat_init, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_MODULE_ORDER,
ipfw_nat_init, NULL);
VNET_SYSINIT(vnet_ipfw_nat_init, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_VNET_ORDER,
vnet_ipfw_nat_init, NULL);
SYSUNINIT(ipfw_nat_destroy, IPFW_NAT_SI_SUB_FIREWALL, IPFW_NAT_MODULE_ORDER,
ipfw_nat_destroy, NULL);
VNET_SYSUNINIT(vnet_ipfw_nat_uninit, IPFW_NAT_SI_SUB_FIREWALL,
IPFW_NAT_VNET_ORDER, vnet_ipfw_nat_uninit, NULL);
/* end of file */

6
sys/netpfil/ipfw/ip_fw_private.h
View file

@ -327,9 +327,11 @@ extern struct cfg_nat *(*lookup_nat_ptr)(struct nat_list *, int);
typedef int ipfw_nat_t(struct ip_fw_args *, struct cfg_nat *, struct mbuf *);
typedef int ipfw_nat_cfg_t(struct sockopt *);
extern ipfw_nat_t *ipfw_nat_ptr;
#define IPFW_NAT_LOADED (ipfw_nat_ptr != NULL)
VNET_DECLARE(int, ipfw_nat_ready);
#define V_ipfw_nat_ready VNET(ipfw_nat_ready)
#define IPFW_NAT_LOADED (V_ipfw_nat_ready)
extern ipfw_nat_t *ipfw_nat_ptr;
extern ipfw_nat_cfg_t *ipfw_nat_cfg_ptr;
extern ipfw_nat_cfg_t *ipfw_nat_del_ptr;
extern ipfw_nat_cfg_t *ipfw_nat_get_cfg_ptr;