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Code

nspawn: make sure macvlan MAC addresses are stable

Browse Source 
https://bugs.freedesktop.org/show_bug.cgi?id=85527
This commit is contained in:
Lennart Poettering 2014-12-09 01:20:09 +01:00
parent 3072eecf3c
commit e867ceb6b9
1 changed files with 21 additions and 12 deletions
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33
src/nspawn/nspawn.c
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@ -1589,8 +1589,9 @@ static int reset_audit_loginuid(void) {
#define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1)
#define CONTAINER_HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2)
#define MACVLAN_HASH_KEY SD_ID128_MAKE(00,13,6d,bc,66,83,44,81,bb,0c,f9,51,1f,24,a6,6f)
static int generate_mac(struct ether_addr *mac, sd_id128_t hash_key) {
static int generate_mac(struct ether_addr *mac, sd_id128_t hash_key, unsigned idx) {
int r;
uint8_t result[8];
@ -1599,6 +1600,8 @@ static int generate_mac(struct ether_addr *mac, sd_id128_t hash_key) {
l = strlen(arg_machine);
sz = sizeof(sd_id128_t) + l;
if (idx > 0)
sz += sizeof(idx);
v = alloca(sz);
/* fetch some persistent data unique to the host */
@ -1608,7 +1611,7 @@ static int generate_mac(struct ether_addr *mac, sd_id128_t hash_key) {
/* combine with some data unique (on this host) to this
* container instance */
memcpy(v + sizeof(sd_id128_t), arg_machine, l);
memcpy(mempcpy(v + sizeof(sd_id128_t), arg_machine, l), &idx, sizeof(idx));
/* Let's hash the host machine ID plus the container name. We
* use a fixed, but originally randomly created hash key here. */
@ -1641,17 +1644,13 @@ static int setup_veth(pid_t pid, char iface_name[IFNAMSIZ], int *ifi) {
snprintf(iface_name, IFNAMSIZ - 1, "%s-%s",
arg_network_bridge ? "vb" : "ve", arg_machine);
r = generate_mac(&mac_container, CONTAINER_HASH_KEY);
if (r < 0) {
log_error("Failed to generate predictable MAC address for container side");
return r;
}
r = generate_mac(&mac_container, CONTAINER_HASH_KEY, 0);
if (r < 0)
return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m");
r = generate_mac(&mac_host, HOST_HASH_KEY);
if (r < 0) {
log_error("Failed to generate predictable MAC address for host side");
return r;
}
r = generate_mac(&mac_host, HOST_HASH_KEY, 0);
if (r < 0)
return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m");
r = sd_rtnl_open(&rtnl, 0);
if (r < 0)
@ -1836,6 +1835,7 @@ static int move_network_interfaces(pid_t pid) {
static int setup_macvlan(pid_t pid) {
_cleanup_udev_unref_ struct udev *udev = NULL;
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
unsigned idx = 0;
char **i;
int r;
@ -1858,12 +1858,17 @@ static int setup_macvlan(pid_t pid) {
STRV_FOREACH(i, arg_network_macvlan) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
_cleanup_free_ char *n = NULL;
struct ether_addr mac;
int ifi;
ifi = parse_interface(udev, *i);
if (ifi < 0)
return ifi;
r = generate_mac(&mac, MACVLAN_HASH_KEY, idx++);
if (r < 0)
return log_error_errno(r, "Failed to create MACVLAN MAC address: %m");
r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
if (r < 0)
return log_error_errno(r, "Failed to allocate netlink message: %m");
@ -1882,6 +1887,10 @@ static int setup_macvlan(pid_t pid) {
if (r < 0)
return log_error_errno(r, "Failed to add netlink interface name: %m");
r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, &mac);
if (r < 0)
return log_error_errno(r, "Failed to add netlink MAC address: %m");
r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
if (r < 0)
return log_error_errno(r, "Failed to add netlink namespace field: %m");