/* add/remove iptable drop rule to VIP */
static void
handle_iptable_rule_to_vip(ip_address_t *ipaddress, int cmd, char *ifname, void *unused)
{
char *argv[10];
unsigned int i = 0;
int if_specifier = -1;
char *addr_str;
if (global_data->vrrp_iptables_inchain[0] == '\0')
return;
if (IP_IS6(ipaddress)) {
handle_iptable_rule_to_NA(ipaddress, cmd, ifname);
argv[i++] = "ip6tables";
} else {
argv[i++] = "iptables";
}
addr_str = ipaddresstos(NULL, ipaddress);
argv[i++] = cmd ? "-A" : "-D";
argv[i++] = global_data->vrrp_iptables_inchain;
argv[i++] = "-d";
argv[i++] = addr_str;
if (IP_IS6(ipaddress) && IN6_IS_ADDR_LINKLOCAL(&ipaddress->u.sin6_addr)) {
if_specifier = i;
argv[i++] = "-i";
argv[i++] = ifname;
}
argv[i++] = "-j";
argv[i++] = "DROP";
argv[i] = NULL;
if (fork_exec(argv) < 0)
log_message(LOG_ERR, "Failed to %s iptable drop rule"
" to vip %s", (cmd) ? "set" : "remove", addr_str);
else
ipaddress->iptable_rule_set = (cmd != IPADDRESS_DEL);
if (global_data->vrrp_iptables_outchain[0] == '\0')
return;
argv[2] = global_data->vrrp_iptables_outchain ;
argv[3] = "-s";
if (if_specifier >= 0)
argv[if_specifier] = "-o";
if (fork_exec(argv) < 0)
log_message(LOG_ERR, "Failed to %s iptable drop rule"
" from vip %s", (cmd) ? "set" : "remove", addr_str);
}
static int
add_addr2rta(struct rtattr *rta, int maxlen, int type, ip_address_t *ip_address)
{
void *addr;
int alen;
if (!ip_address)
return -1;
addr = (IP_IS6(ip_address)) ? (void *) &ip_address->u.sin6_addr :
(void *) &ip_address->u.sin.sin_addr;
alen = (IP_IS6(ip_address)) ? sizeof(ip_address->u.sin6_addr) :
sizeof(ip_address->u.sin.sin_addr);
return rta_addattr_l(rta, maxlen, type, addr, alen);
}
void
address_print(FILE *file, void *data)
{
ip_address_t *ipaddr = data;
char *broadcast = (char *) MALLOC(21);
char *addr_str = (char *) MALLOC(41);
if (IP_IS6(ipaddr)) {
inet_ntop(AF_INET6, &ipaddr->u.sin6_addr, addr_str, 41);
} else {
inet_ntop(AF_INET, &ipaddr->u.sin.sin_addr, addr_str, 41);
if (ipaddr->u.sin.sin_brd.s_addr)
snprintf(broadcast, 20, " brd %s",
inet_ntop2(ipaddr->u.sin.sin_brd.s_addr));
}
fprintf(file, " %s/%d%s dev %s scope %s%s%s\n"
, addr_str
, ipaddr->ifa.ifa_prefixlen
, broadcast
, IF_NAME(ipaddr->ifp)
, netlink_scope_n2a(ipaddr->ifa.ifa_scope)
, ipaddr->label ? " label " : ""
, ipaddr->label ? ipaddr->label : "");
FREE(broadcast);
FREE(addr_str);
}
static void
address_print(FILE *file, void *data)
{
ip_address_t *ipaddr = data;
char broadcast[INET_ADDRSTRLEN + 5] = ""; /* allow for " brd " */
char addr_str[INET6_ADDRSTRLEN] = "";
if (IP_IS6(ipaddr)) {
inet_ntop(AF_INET6, &ipaddr->u.sin6_addr, addr_str, sizeof(addr_str));
} else {
inet_ntop(AF_INET, &ipaddr->u.sin.sin_addr, addr_str, sizeof(addr_str));
if (ipaddr->u.sin.sin_brd.s_addr)
snprintf(broadcast, sizeof(broadcast) - 1, " brd %s",
inet_ntop2(ipaddr->u.sin.sin_brd.s_addr));
}
fprintf(file, " %s/%d%s dev %s%s%s%s%s\n"
, addr_str
, ipaddr->ifa.ifa_prefixlen
, broadcast
, IF_NAME(ipaddr->ifp)
, IP_IS4(ipaddr) ? " scope " : ""
, IP_IS4(ipaddr) ? netlink_scope_n2a(ipaddr->ifa.ifa_scope) : ""
, ipaddr->label ? " label " : ""
, ipaddr->label ? ipaddr->label : "");
}
char *
ipaddresstos(char *buf, ip_address_t *ipaddress)
{
static char addr_str[INET6_ADDRSTRLEN];
if (!buf)
buf = addr_str;
if (IP_IS6(ipaddress)) {
inet_ntop(AF_INET6, &ipaddress->u.sin6_addr, buf, INET6_ADDRSTRLEN);
} else {
inet_ntop(AF_INET, &ipaddress->u.sin.sin_addr, buf, INET_ADDRSTRLEN);
}
return buf;
}
void
handle_iptable_rule_to_vip(ip_address_t *ipaddress, int cmd, char *ifname, struct ipt_handle *h)
{
char *my_ifname = NULL;
if (!use_iptables)
return;
if (global_data->vrrp_iptables_inchain[0] == '\0')
return;
#ifdef _HAVE_LIBIPSET_
if (global_data->using_ipsets)
{
if (!h->session)
h->session = ipset_session_start();
ipset_entry(h->session, cmd, ipaddress, ifname);
ipaddress->iptable_rule_set = (cmd != IPADDRESS_DEL);
return;
}
#endif
if (IP_IS6(ipaddress)) {
if (IN6_IS_ADDR_LINKLOCAL(&ipaddress->u.sin6_addr))
my_ifname = ifname;
handle_iptable_rule_to_NA(ipaddress, cmd, my_ifname, h);
}
iptables_entry(h, global_data->vrrp_iptables_inchain, -1,
XTC_LABEL_DROP, NULL, ipaddress,
my_ifname, NULL,
IPPROTO_NONE, 0, cmd);
ipaddress->iptable_rule_set = (cmd != IPADDRESS_DEL);
if (global_data->vrrp_iptables_outchain[0] == '\0')
return;
iptables_entry(h, global_data->vrrp_iptables_outchain, -1,
XTC_LABEL_DROP, ipaddress, NULL,
NULL, my_ifname,
IPPROTO_NONE, 0, cmd);
}
void
dump_ipaddress(void *if_data)
{
ip_address_t *ipaddr = if_data;
char broadcast[INET_ADDRSTRLEN + 5] = "";
if (!IP_IS6(ipaddr) && ipaddr->u.sin.sin_brd.s_addr) {
snprintf(broadcast, 21, " brd %s",
inet_ntop2(ipaddr->u.sin.sin_brd.s_addr));
}
log_message(LOG_INFO, " %s/%d%s dev %s scope %s%s%s"
, ipaddresstos(NULL, ipaddr)
, ipaddr->ifa.ifa_prefixlen
, broadcast
, IF_NAME(ipaddr->ifp)
, get_rttables_scope(ipaddr->ifa.ifa_scope)
, ipaddr->label ? " label " : ""
, ipaddr->label ? ipaddr->label : "");
}
/* Utility functions */
static int
add_addr2req(struct nlmsghdr *n, int maxlen, int type, ip_address_t *ip_address)
{
void *addr;
int alen;
if (!ip_address)
return -1;
if (IP_IS6(ip_address)) {
addr = (void *) &ip_address->u.sin6_addr;
alen = sizeof(ip_address->u.sin6_addr);
}
else
{
addr = (void *) &ip_address->u.sin.sin_addr;
alen = sizeof(ip_address->u.sin.sin_addr);
}
return addattr_l(n, maxlen, type, addr, alen);
}
static int
add_addr_fam2req(struct nlmsghdr *n, int maxlen, int type, ip_address_t *ip_address)
{
void *addr;
int alen;
uint16_t family;
if (!ip_address)
return -1;
if (IP_IS6(ip_address)) {
addr = (void *)&ip_address->u.sin6_addr;
alen = sizeof(ip_address->u.sin6_addr);
}
else {
addr = (void *)&ip_address->u.sin.sin_addr;
alen = sizeof(ip_address->u.sin.sin_addr);
}
family = ip_address->ifa.ifa_family;
return addattr_l2(n, maxlen, type, &family, sizeof(family), addr, alen);
}
/* Add/Delete IP address to a specific interface_t */
int
netlink_ipaddress(ip_address_t *ipaddress, int cmd)
{
struct ifa_cacheinfo cinfo;
int status = 1;
struct {
struct nlmsghdr n;
struct ifaddrmsg ifa;
char buf[256];
} req;
memset(&req, 0, sizeof (req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof (struct ifaddrmsg));
req.n.nlmsg_flags = NLM_F_REQUEST;
req.n.nlmsg_type = (cmd == IPADDRESS_DEL) ? RTM_DELADDR : RTM_NEWADDR;
req.ifa = ipaddress->ifa;
if (IP_IS6(ipaddress)) {
if (cmd == IPADDRESS_ADD) {
/* Mark IPv6 address as deprecated (rfc3484) in order to prevent
* using VRRP VIP as source address in healthchecking use cases.
*/
if (ipaddress->ifa.ifa_prefixlen == 128) {
memset(&cinfo, 0, sizeof(cinfo));
cinfo.ifa_prefered = 0;
cinfo.ifa_valid = INFINITY_LIFE_TIME;
log_message(LOG_INFO, "%s has a prefix length of 128, setting "
"preferred_lft to 0", ipaddresstos(NULL, ipaddress));
addattr_l(&req.n, sizeof(req), IFA_CACHEINFO, &cinfo,
sizeof(cinfo));
}
/* Disable, per VIP, Duplicate Address Detection algorithm (DAD).
* Using the nodad flag has the following benefits:
*
* (1) The address becomes immediately usable after they're
* configured.
* (2) In the case of a temporary layer-2 / split-brain problem
* we can avoid that the active VIP transitions into the
* dadfailed phase and stays there forever - leaving us
* without service. HA/VRRP setups have their own "DAD"-like
* functionality, so it's not really needed from the IPv6 stack.
*/
#ifdef IFA_F_NODAD /* Since Linux 2.6.19 */
req.ifa.ifa_flags |= IFA_F_NODAD;
#endif
}
addattr_l(&req.n, sizeof(req), IFA_LOCAL,
&ipaddress->u.sin6_addr, sizeof(ipaddress->u.sin6_addr));
} else {
addattr_l(&req.n, sizeof(req), IFA_LOCAL,
&ipaddress->u.sin.sin_addr, sizeof(ipaddress->u.sin.sin_addr));
if (cmd == IPADDRESS_ADD) {
if (ipaddress->u.sin.sin_brd.s_addr)
addattr_l(&req.n, sizeof(req), IFA_BROADCAST,
&ipaddress->u.sin.sin_brd, sizeof(ipaddress->u.sin.sin_brd));
}
else {
/* IPADDRESS_DEL */
addattr_l(&req.n, sizeof(req), IFA_ADDRESS,
&ipaddress->u.sin.sin_addr, sizeof(ipaddress->u.sin.sin_addr));
}
}
if (cmd == IPADDRESS_ADD)
if (ipaddress->label)
addattr_l(&req.n, sizeof (req), IFA_LABEL,
ipaddress->label, strlen(ipaddress->label) + 1);
if (netlink_talk(&nl_cmd, &req.n) < 0)
status = -1;
return status;
}