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Virtualize if_bridge(4) cloner.

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This commit is contained in:
Hiroki Sato 2014-10-05 19:43:37 +00:00
parent 2b4a2528d7
commit c51275260b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=272568
1 changed files with 126 additions and 72 deletions
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198
sys/net/if_bridge.c
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@ -226,7 +226,8 @@ struct bridge_softc {
u_char sc_defaddr[6]; /* Default MAC address */
};
static struct mtx bridge_list_mtx;
static VNET_DEFINE(struct mtx, bridge_list_mtx);
#define V_bridge_list_mtx VNET(bridge_list_mtx)
eventhandler_tag bridge_detach_cookie = NULL;
int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
@ -350,36 +351,64 @@ static struct bstp_cb_ops bridge_ops = {
SYSCTL_DECL(_net_link);
static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
static int pfil_member = 1; /* run pfil hooks on the member interface */
static int pfil_ipfw = 0; /* layer2 filter with ipfw */
static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */
static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for
locally destined packets */
static int log_stp = 0; /* log STP state changes */
static int bridge_inherit_mac = 0; /* share MAC with first bridge member */
SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RWTUN,
&pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RWTUN,
&pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2");
SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RWTUN,
&pfil_bridge, 0, "Packet filter on the bridge interface");
SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RWTUN,
&pfil_member, 0, "Packet filter on the member interface");
SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RWTUN,
&pfil_local_phys, 0,
/* only pass IP[46] packets when pfil is enabled */
static VNET_DEFINE(int, pfil_onlyip) = 1;
#define V_pfil_onlyip VNET(pfil_onlyip)
SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
"Only pass IP packets when pfil is enabled");
/* run pfil hooks on the bridge interface */
static VNET_DEFINE(int, pfil_bridge) = 1;
#define V_pfil_bridge VNET(pfil_bridge)
SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
"Packet filter on the bridge interface");
/* layer2 filter with ipfw */
static VNET_DEFINE(int, pfil_ipfw);
#define V_pfil_ipfw VNET(pfil_ipfw)
/* layer2 ARP filter with ipfw */
static VNET_DEFINE(int, pfil_ipfw_arp);
#define V_pfil_ipfw_arp VNET(pfil_ipfw_arp)
SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
"Filter ARP packets through IPFW layer2");
/* run pfil hooks on the member interface */
static VNET_DEFINE(int, pfil_member) = 1;
#define V_pfil_member VNET(pfil_member)
SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
"Packet filter on the member interface");
/* run pfil hooks on the physical interface for locally destined packets */
static VNET_DEFINE(int, pfil_local_phys);
#define V_pfil_local_phys VNET(pfil_local_phys)
SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
"Packet filter on the physical interface for locally destined packets");
SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RWTUN,
&log_stp, 0, "Log STP state changes");
SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RWTUN,
&bridge_inherit_mac, 0,
/* log STP state changes */
static VNET_DEFINE(int, log_stp);
#define V_log_stp VNET(log_stp)
SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
"Log STP state changes");
/* share MAC with first bridge member */
static VNET_DEFINE(int, bridge_inherit_mac);
#define V_bridge_inherit_mac VNET(bridge_inherit_mac)
SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
"Inherit MAC address from the first bridge member");
static VNET_DEFINE(int, allow_llz_overlap) = 0;
#define V_allow_llz_overlap VNET(allow_llz_overlap)
SYSCTL_VNET_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, CTLFLAG_RW,
&VNET_NAME(allow_llz_overlap), 0, "Allow overlap of link-local scope "
SYSCTL_VNET_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
"Allow overlap of link-local scope "
"zones of a bridge interface and the member interfaces");
struct bridge_control {
@ -477,27 +506,52 @@ const struct bridge_control bridge_control_table[] = {
BC_F_COPYIN|BC_F_SUSER },
};
const int bridge_control_table_size =
sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
const int bridge_control_table_size = nitems(bridge_control_table);
LIST_HEAD(, bridge_softc) bridge_list;
static VNET_DEFINE(LIST_HEAD(, bridge_softc), bridge_list);
#define V_bridge_list VNET(bridge_list)
#define BRIDGE_LIST_LOCK_INIT(x) mtx_init(&V_bridge_list_mtx, \
"if_bridge list", NULL, MTX_DEF)
#define BRIDGE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_bridge_list_mtx)
#define BRIDGE_LIST_LOCK(x) mtx_lock(&V_bridge_list_mtx)
#define BRIDGE_LIST_UNLOCK(x) mtx_unlock(&V_bridge_list_mtx)
static VNET_DEFINE(struct if_clone *, bridge_cloner);
#define V_bridge_cloner VNET(bridge_cloner)
static struct if_clone *bridge_cloner;
static const char bridge_name[] = "bridge";
static void
vnet_bridge_init(const void *unused __unused)
{
BRIDGE_LIST_LOCK_INIT();
LIST_INIT(&V_bridge_list);
V_bridge_cloner = if_clone_simple(bridge_name,
bridge_clone_create, bridge_clone_destroy, 0);
}
VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
vnet_bridge_init, NULL);
static void
vnet_bridge_uninit(const void *unused __unused)
{
if_clone_detach(V_bridge_cloner);
BRIDGE_LIST_LOCK_DESTROY();
}
VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
vnet_bridge_uninit, NULL);
static int
bridge_modevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF);
bridge_cloner = if_clone_simple(bridge_name,
bridge_clone_create, bridge_clone_destroy, 0);
bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
UMA_ALIGN_PTR, 0);
LIST_INIT(&bridge_list);
bridge_input_p = bridge_input;
bridge_output_p = bridge_output;
bridge_dn_p = bridge_dummynet;
@ -509,13 +563,11 @@ bridge_modevent(module_t mod, int type, void *data)
case MOD_UNLOAD:
EVENTHANDLER_DEREGISTER(ifnet_departure_event,
bridge_detach_cookie);
if_clone_detach(bridge_cloner);
uma_zdestroy(bridge_rtnode_zone);
bridge_input_p = NULL;
bridge_output_p = NULL;
bridge_dn_p = NULL;
bridge_linkstate_p = NULL;
mtx_destroy(&bridge_list_mtx);
break;
default:
return (EOPNOTSUPP);
@ -538,14 +590,14 @@ MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
static int
sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
{
int enable = pfil_ipfw;
int enable = V_pfil_ipfw;
int error;
error = sysctl_handle_int(oidp, &enable, 0, req);
enable = (enable) ? 1 : 0;
enable &= 1;
if (enable != pfil_ipfw) {
pfil_ipfw = enable;
if (enable != V_pfil_ipfw) {
V_pfil_ipfw = enable;
/*
* Disable pfil so that ipfw doesnt run twice, if the user
@ -553,17 +605,19 @@ sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
* pfil_member. Also allow non-ip packets as ipfw can filter by
* layer2 type.
*/
if (pfil_ipfw) {
pfil_onlyip = 0;
pfil_bridge = 0;
pfil_member = 0;
if (V_pfil_ipfw) {
V_pfil_onlyip = 0;
V_pfil_bridge = 0;
V_pfil_member = 0;
}
}
return (error);
}
SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW,
&pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW");
SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET,
&VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I",
"Layer2 filter with IPFW");
/*
* bridge_clone_create:
@ -632,8 +686,8 @@ bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
fb = 1;
retry = 0;
mtx_lock(&bridge_list_mtx);
LIST_FOREACH(sc2, &bridge_list, sc_list) {
BRIDGE_LIST_LOCK();
LIST_FOREACH(sc2, &V_bridge_list, sc_list) {
bifp = sc2->sc_ifp;
if (memcmp(sc->sc_defaddr,
IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
@ -641,7 +695,7 @@ bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
break;
}
}
mtx_unlock(&bridge_list_mtx);
BRIDGE_LIST_UNLOCK();
} while (retry == 1);
bstp_attach(&sc->sc_stp, &bridge_ops);
@ -650,9 +704,9 @@ bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
ifp->if_baudrate = 0;
ifp->if_type = IFT_BRIDGE;
mtx_lock(&bridge_list_mtx);
LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
mtx_unlock(&bridge_list_mtx);
BRIDGE_LIST_LOCK();
LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
BRIDGE_LIST_UNLOCK();
return (0);
}
@ -684,9 +738,9 @@ bridge_clone_destroy(struct ifnet *ifp)
callout_drain(&sc->sc_brcallout);
mtx_lock(&bridge_list_mtx);
BRIDGE_LIST_LOCK();
LIST_REMOVE(sc, sc_list);
mtx_unlock(&bridge_list_mtx);
BRIDGE_LIST_UNLOCK();
bstp_detach(&sc->sc_stp);
ether_ifdetach(ifp);
@ -952,7 +1006,7 @@ bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
* the mac address of the bridge to the address of the next member, or
* to its default address if no members are left.
*/
if (bridge_inherit_mac && sc->sc_ifaddr == ifs) {
if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
if (LIST_EMPTY(&sc->sc_iflist)) {
bcopy(sc->sc_defaddr,
IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
@ -1118,7 +1172,7 @@ bridge_ioctl_add(struct bridge_softc *sc, void *arg)
* member and the MAC address of the bridge has not been changed from
* the default randomly generated one.
*/
if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
!memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) {
bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
sc->sc_ifaddr = ifs;
@ -1757,8 +1811,8 @@ bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
}
/* Check if the interface is a span port */
mtx_lock(&bridge_list_mtx);
LIST_FOREACH(sc, &bridge_list, sc_list) {
BRIDGE_LIST_LOCK();
LIST_FOREACH(sc, &V_bridge_list, sc_list) {
BRIDGE_LOCK(sc);
LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
if (ifp == bif->bif_ifp) {
@ -1768,7 +1822,7 @@ bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
BRIDGE_UNLOCK(sc);
}
mtx_unlock(&bridge_list_mtx);
BRIDGE_LIST_UNLOCK();
}
/*
@ -2350,7 +2404,7 @@ bridge_input(struct ifnet *ifp, struct mbuf *m)
if_inc_counter(iface, IFCOUNTER_IPACKETS, 1); \
if_inc_counter(iface, IFCOUNTER_IBYTES, m->m_pkthdr.len); \
/* Filter on the physical interface. */ \
if (pfil_local_phys && \
if (V_pfil_local_phys && \
(PFIL_HOOKED(&V_inet_pfil_hook) \
OR_PFIL_HOOKED_INET6)) { \
if (bridge_pfil(&m, NULL, ifp, \
@ -3004,7 +3058,7 @@ bridge_state_change(struct ifnet *ifp, int state)
"discarding"
};
if (log_stp)
if (V_log_stp)
log(LOG_NOTICE, "%s: state changed to %s on %s\n",
sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
}
@ -3032,7 +3086,7 @@ bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
#endif
if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0)
if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0)
return (0); /* filtering is disabled */
i = min((*mp)->m_pkthdr.len, max_protohdr);
@ -3074,7 +3128,7 @@ bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
switch (ether_type) {
case ETHERTYPE_ARP:
case ETHERTYPE_REVARP:
if (pfil_ipfw_arp == 0)
if (V_pfil_ipfw_arp == 0)
return (0); /* Automatically pass */
break;
@ -3089,12 +3143,12 @@ bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
* packets, these will not be checked by pfil(9) and
* passed unconditionally so the default is to drop.
*/
if (pfil_onlyip)
if (V_pfil_onlyip)
goto bad;
}
/* Run the packet through pfil before stripping link headers */
if (PFIL_HOOKED(&V_link_pfil_hook) && pfil_ipfw != 0 &&
if (PFIL_HOOKED(&V_link_pfil_hook) && V_pfil_ipfw != 0 &&
dir == PFIL_OUT && ifp != NULL) {
error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL);
@ -3147,21 +3201,21 @@ bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
* Keep the order:
* in_if -> bridge_if -> out_if
*/
if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
dir, NULL);
if (*mp == NULL || error != 0) /* filter may consume */
break;
if (pfil_member && ifp != NULL)
if (V_pfil_member && ifp != NULL)
error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp,
dir, NULL);
if (*mp == NULL || error != 0) /* filter may consume */
break;
if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp,
dir, NULL);
@ -3169,7 +3223,7 @@ bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
break;
/* check if we need to fragment the packet */
if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
i = (*mp)->m_pkthdr.len;
if (i > ifp->if_mtu) {
error = bridge_fragment(ifp, *mp, &eh2, snap,
@ -3199,21 +3253,21 @@ bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
break;
#ifdef INET6
case ETHERTYPE_IPV6:
if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL)
error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
dir, NULL);
if (*mp == NULL || error != 0) /* filter may consume */
break;
if (pfil_member && ifp != NULL)
if (V_pfil_member && ifp != NULL)
error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp,
dir, NULL);
if (*mp == NULL || error != 0) /* filter may consume */
break;
if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL)
error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp,
dir, NULL);
break;