+/**
+ * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License v2 as published by
+ * the Free Software Foundation.
+ *
+ * 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.
+ *
+ */
+
#include <fcntl.h>
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <stddef.h>
#include <stdbool.h>
+#include <syslog.h>
#include <unistd.h>
#include <net/if.h>
+#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/icmp6.h>
static int sock = -1, rtnl_sock = -1;
static unsigned if_index = 0;
static char if_name[IF_NAMESIZE] = {0};
-static volatile int rs_attempt = 1;
+static volatile int rs_attempt = 0;
static struct in6_addr lladdr = IN6ADDR_ANY_INIT;
static void ra_send_rs(int signal __attribute__((unused)));
const struct sockaddr_in6 dest = {AF_INET6, 0, 0, ALL_IPV6_ROUTERS, if_index};
sendto(sock, &rs, sizeof(rs), MSG_DONTWAIT, (struct sockaddr*)&dest, sizeof(dest));
- if (++rs_attempt < 3)
+ if (++rs_attempt <= 3)
alarm(4);
}
static int16_t pref_to_priority(uint8_t flags)
{
flags = (flags >> 3) & 0x03;
- return (flags == 0x00) ? 1024 : (flags == 0x01) ? 512 :
- (flags == 0x11) ? 2048 : -1;
+ return (flags == 0x0) ? 1024 : (flags == 0x1) ? 512 :
+ (flags == 0x3) ? 2048 : -1;
}
{
struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, length, 0, *any, 0, 0};
struct odhcp6c_entry *x = odhcp6c_find_entry(STATE_RA_PREFIX, &entry);
- if (x) {
+ if (x && IN6_ARE_ADDR_EQUAL(&x->target, any)) {
odhcp6c_random(&x->target.s6_addr32[2], 2 * sizeof(uint32_t));
} else if (odhcp6c_find_entry(STATE_IA_NA, &entry)) {
dhcpv6_request(DHCPV6_MSG_DECLINE);
bool ra_rtnl_process(void)
{
bool found = false;
+ uint32_t elapsed = odhcp6c_elapsed();
uint8_t buf[8192];
while (true) {
ssize_t len = recv(rtnl_sock, buf, sizeof(buf), MSG_DONTWAIT);
if (len < 0)
break;
+ if (elapsed > 10)
+ continue;
+
for (struct nlmsghdr *nh = (struct nlmsghdr*)buf; NLMSG_OK(nh, (size_t)len);
nh = NLMSG_NEXT(nh, len)) {
struct ifaddrmsg *ifa = NLMSG_DATA(nh);
struct in6_addr *addr = NULL;
- if (nh->nlmsg_type != RTM_NEWADDR || NLMSG_PAYLOAD(nh, 0) < sizeof(*ifa) ||
- !(ifa->ifa_flags & IFA_F_DADFAILED) ||
- ifa->ifa_index != if_index)
+ if (NLMSG_PAYLOAD(nh, 0) < sizeof(*ifa) || ifa->ifa_index != if_index ||
+ (nh->nlmsg_type == RTM_NEWADDR && !(ifa->ifa_flags & IFA_F_DADFAILED)) ||
+ (nh->nlmsg_type == RTM_DELADDR && !(ifa->ifa_flags & IFA_F_TENTATIVE)) ||
+ (nh->nlmsg_type != RTM_NEWADDR && nh->nlmsg_type != RTM_DELADDR))
continue;
ssize_t alen = NLMSG_PAYLOAD(nh, sizeof(*ifa));
for (struct rtattr *rta = (struct rtattr*)&ifa[1]; RTA_OK(rta, alen);
rta = RTA_NEXT(rta, alen))
- if (rta->rta_type == IFA_LOCAL && RTA_PAYLOAD(rta) >= sizeof(*addr))
+ if (rta->rta_type == IFA_ADDRESS && RTA_PAYLOAD(rta) >= sizeof(*addr))
addr = RTA_DATA(rta);
- if (addr)
+ if (addr) {
+ char ipbuf[INET6_ADDRSTRLEN];
+ inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf));
+ syslog(LOG_WARNING, "duplicate address detected: %s (code: %u:%x)",
+ ipbuf, (unsigned)nh->nlmsg_type, (unsigned)ifa->ifa_flags);
found |= ra_deduplicate(addr, ifa->ifa_prefixlen);
+ }
}
}
return found;
struct nd_router_advert *adv = (struct nd_router_advert*)buf;
struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0, IN6ADDR_ANY_INIT, 0, 0};
const struct in6_addr any = IN6ADDR_ANY_INIT;
- odhcp6c_expire();
while (true) {
struct sockaddr_in6 from;
rs_attempt = 0;
}
- found = true;
+ if (!found) {
+ odhcp6c_expire();
+ found = true;
+ }
uint32_t router_valid = ntohs(adv->nd_ra_router_lifetime);
// Parse default route
+ entry.target = any;
+ entry.length = 0;
entry.router = from.sin6_addr;
entry.priority = pref_to_priority(adv->nd_ra_flags_reserved);
if (entry.priority < 0)
struct icmpv6_opt *opt;
icmpv6_for_each_option(opt, &adv[1], &buf[len]) {
if (opt->type == ND_OPT_MTU) {
- update_proc("conf", "mtu", ntohl(*((uint32_t*)&opt->data[2])));
+ uint32_t *mtu = (uint32_t*)&opt->data[2];
+ update_proc("conf", "mtu", ntohl(*mtu));
} else if (opt->type == ND_OPT_ROUTE_INFORMATION && opt->len <= 3) {
entry.router = from.sin6_addr;
entry.target = any;
entry.priority = pref_to_priority(opt->data[1]);
entry.length = opt->data[0];
- entry.valid = ntohl(*((uint32_t*)&opt->data[2]));
+ uint32_t *valid = (uint32_t*)&opt->data[2];
+ entry.valid = ntohl(*valid);
memcpy(&entry.target, &opt->data[6], (opt->len - 1) * 8);
if (entry.length > 128 || IN6_IS_ADDR_LINKLOCAL(&entry.target)
struct nd_opt_prefix_info *pinfo = (struct nd_opt_prefix_info*)opt;
entry.router = any;
entry.target = pinfo->nd_opt_pi_prefix;
- entry.priority = 0;
+ entry.priority = 256;
entry.length = pinfo->nd_opt_pi_prefix_len;
entry.valid = ntohl(pinfo->nd_opt_pi_valid_time);
entry.preferred = ntohl(pinfo->nd_opt_pi_preferred_time);
entry.router = from.sin6_addr;
entry.priority = 0;
entry.length = 128;
- entry.valid = ntohl(*((uint32_t*)&opt->data[2]));
+ uint32_t *valid = (uint32_t*)&opt->data[2];
+ entry.valid = ntohl(*valid);
entry.preferred = 0;
for (ssize_t i = 0; i < (opt->len - 1) / 2; ++i) {
size_t ra_dns_len;
struct odhcp6c_entry *entry = odhcp6c_get_state(STATE_RA_DNS, &ra_dns_len);
- for (size_t i = 0; i < len / sizeof(*entry); ++i)
+ for (size_t i = 0; i < ra_dns_len / sizeof(*entry); ++i)
if (IN6_ARE_ADDR_EQUAL(&entry[i].router, &from.sin6_addr) &&
entry[i].valid > router_valid)
entry[i].valid = router_valid;
}
- odhcp6c_expire();
+ if (found)
+ odhcp6c_expire();
+
return found;
}