diff options
Diffstat (limited to 'freebsd/sys/net/if_epair.c')
| -rw-r--r-- | freebsd/sys/net/if_epair.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/freebsd/sys/net/if_epair.c b/freebsd/sys/net/if_epair.c index d727bc2c..69ff3efc 100644 --- a/freebsd/sys/net/if_epair.c +++ b/freebsd/sys/net/if_epair.c @@ -109,6 +109,7 @@ static int epair_clone_create(struct if_clone *, char *, size_t, caddr_t); static int epair_clone_destroy(struct if_clone *, struct ifnet *); static const char epairname[] = "epair"; +static unsigned int next_index = 0; /* Netisr related definitions and sysctl. */ static struct netisr_handler epair_nh = { @@ -181,7 +182,7 @@ STAILQ_HEAD(eid_list, epair_ifp_drain); static MALLOC_DEFINE(M_EPAIR, epairname, "Pair of virtual cross-over connected Ethernet-like interfaces"); -static VNET_DEFINE(struct if_clone *, epair_cloner); +VNET_DEFINE_STATIC(struct if_clone *, epair_cloner); #define V_epair_cloner VNET(epair_cloner) /* @@ -845,12 +846,22 @@ epair_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) /* * Calculate the etheraddr hashing the hostid and the - * interface index. The result would be hopefully unique + * interface index. The result would be hopefully unique. + * Note that the "a" component of an epair instance may get moved + * to a different VNET after creation. In that case its index + * will be freed and the index can get reused by new epair instance. + * Make sure we do not create same etheraddr again. */ getcredhostid(curthread->td_ucred, (unsigned long *)&hostid); if (hostid == 0) arc4rand(&hostid, sizeof(hostid), 0); - key[0] = (uint32_t)ifp->if_index; + + if (ifp->if_index > next_index) + next_index = ifp->if_index; + else + next_index++; + + key[0] = (uint32_t)next_index; key[1] = (uint32_t)(hostid & 0xffffffff); key[2] = (uint32_t)((hostid >> 32) & 0xfffffffff); hash = jenkins_hash32(key, 3, 0); |