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/*
* Soft: Keepalived is a failover program for the LVS project
* <www.linuxvirtualserver.org>. It monitor & manipulate
* a loadbalanced server pool using multi-layer checks.
*
* Part: NETLINK IPv4 address manipulation.
*
* Version: $Id: vrrp_ipaddress.c,v 1.1.17 2009/03/05 01:31:12 acassen Exp $
*
* Author: Alexandre Cassen, <acassen@linux-vs.org>
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Copyright (C) 2001-2009 Alexandre Cassen, <acassen@freebox.fr>
*/
/* local include */
#include "vrrp_ipaddress.h"
#include "vrrp_netlink.h"
#include "vrrp_data.h"
#include "logger.h"
#include "memory.h"
#include "utils.h"
/* Add/Delete IP address to a specific interface */
int
netlink_address_ipv4(ip_address *ipaddr, int cmd)
{
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 ? RTM_NEWADDR : RTM_DELADDR;
req.ifa.ifa_family = AF_INET;
req.ifa.ifa_index = ipaddr->ifindex;
req.ifa.ifa_scope = ipaddr->scope;
req.ifa.ifa_prefixlen = ipaddr->mask;
addattr_l(&req.n, sizeof (req), IFA_LOCAL, &ipaddr->addr, sizeof (ipaddr->addr));
if (ipaddr->broadcast)
addattr_l(&req.n, sizeof (req), IFA_BROADCAST,
&ipaddr->broadcast, sizeof (ipaddr->broadcast));
if (ipaddr->label)
addattr_l(&req.n, sizeof (req), IFA_LABEL,
ipaddr->label, strlen(ipaddr->label) + 1);
if (netlink_talk(&nl_cmd, &req.n) < 0)
status = -1;
return status;
}
/* Add/Delete a list of IP addresses */
void
netlink_iplist_ipv4(list ip_list, int cmd)
{
ip_address *ipaddress;
element e;
/* No addresses in this list */
if (LIST_ISEMPTY(ip_list))
return;
/*
* If "--dont-release-vrrp" (debug & 8) is set then try to release
* addresses that may be there, even if we didn't set them.
*/
for (e = LIST_HEAD(ip_list); e; ELEMENT_NEXT(e)) {
ipaddress = ELEMENT_DATA(e);
if ((cmd && !ipaddress->set) ||
(!cmd && (ipaddress->set || debug & 8))) {
if (netlink_address_ipv4(ipaddress, cmd) > 0)
ipaddress->set = (cmd) ? 1 : 0;
else
ipaddress->set = 0;
}
}
}
/* IP address dump/allocation */
void
free_ipaddress(void *if_data_obj)
{
ip_address *ip_addr = if_data_obj;
FREE_PTR(ip_addr->label);
FREE(ip_addr);
}
void
dump_ipaddress(void *if_data_obj)
{
ip_address *ip_addr = if_data_obj;
log_message(LOG_INFO, " %s/%d brd %s dev %s scope %s%s%s"
, inet_ntop2(ip_addr->addr)
, ip_addr->mask
, inet_ntop2(ip_addr->broadcast)
, IF_NAME(if_get_by_ifindex(ip_addr->ifindex))
, netlink_scope_n2a(ip_addr->scope)
, ip_addr->label ? " label " : ""
, ip_addr->label ? ip_addr->label : "");
}
void
alloc_ipaddress(list ip_list, vector strvec, interface *ifp)
{
ip_address *new;
uint32_t ipaddr = 0;
char *str;
int i = 0;
new = (ip_address *) MALLOC(sizeof(ip_address));
if (ifp) {
new->ifp = ifp;
new->ifindex = IF_INDEX(ifp);
} else {
new->ifp = if_get_by_ifname(DFLT_INT);
new->ifindex = IF_INDEX(new->ifp);
}
/* FMT parse */
while (i < VECTOR_SIZE(strvec)) {
str = VECTOR_SLOT(strvec, i);
/* cmd parsing */
if (!strcmp(str, "dev")) {
new->ifp = if_get_by_ifname(VECTOR_SLOT(strvec, ++i));
if (!new->ifp) {
log_message(LOG_INFO, "VRRP is trying to assign VIP to unknown %s"
" interface !!! go out and fixe your conf !!!",
(char *)VECTOR_SLOT(strvec, i));
FREE(new);
return;
}
new->ifindex = IF_INDEX(new->ifp);
} else if (!strcmp(str, "scope")) {
new->scope = netlink_scope_a2n(VECTOR_SLOT(strvec, ++i));
} else if (!strcmp(str, "broadcast") || !strcmp(str, "brd")) {
inet_ston(VECTOR_SLOT(strvec, ++i), &new->broadcast);
} else if (!strcmp(str, "label")) {
new->label = MALLOC(IFNAMSIZ);
strncpy(new->label, VECTOR_SLOT(strvec, ++i), IFNAMSIZ);
} else {
if (inet_ston(VECTOR_SLOT(strvec, i), &ipaddr)) {
inet_ston(VECTOR_SLOT(strvec, i), &new->addr);
new->mask = inet_stom(VECTOR_SLOT(strvec, i));
}
}
i++;
}
list_add(ip_list, new);
}
/* Find an address in a list */
int
address_exist(list l, ip_address *ipaddress)
{
ip_address *ipaddr;
element e;
for (e = LIST_HEAD(l); e; ELEMENT_NEXT(e)) {
ipaddr = ELEMENT_DATA(e);
if (IP_ISEQ(ipaddr, ipaddress)) {
ipaddr->set = ipaddress->set;
return 1;
}
}
return 0;
}
/* Clear diff addresses */
void
clear_diff_address(list l, list n)
{
ip_address *ipaddress;
element e;
/* No addresses in previous conf */
if (LIST_ISEMPTY(l))
return;
/* All addresses removed */
if (LIST_ISEMPTY(n)) {
log_message(LOG_INFO, "Removing a VIP|E-VIP block");
netlink_iplist_ipv4(l, IPADDRESS_DEL);
return;
}
for (e = LIST_HEAD(l); e; ELEMENT_NEXT(e)) {
ipaddress = ELEMENT_DATA(e);
if (!address_exist(n, ipaddress) && ipaddress->set) {
log_message(LOG_INFO, "ip address %s/%d dev %s, no longer exist"
, inet_ntop2(ipaddress->addr)
, ipaddress->mask
, IF_NAME(if_get_by_ifindex(ipaddress->ifindex)));
netlink_address_ipv4(ipaddress, IPADDRESS_DEL);
}
}
}
/* Clear static ip address */
void
clear_diff_saddresses(void)
{
clear_diff_address(old_vrrp_data->static_addresses, vrrp_data->static_addresses);
}
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