+/**
+ * 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 void ra_send_rs(int signal __attribute__((unused)));
-int ra_init(const char *ifname)
+int ra_init(const char *ifname, const struct in6_addr *ifid)
{
sock = socket(AF_INET6, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_ICMPV6);
if_index = if_nametoindex(ifname);
strncpy(if_name, ifname, sizeof(if_name) - 1);
+ lladdr = *ifid;
// Filter ICMPv6 package types
struct icmp6_filter filt;
fcntl(sock, F_SETOWN, ourpid);
fcntl(sock, F_SETFL, fcntl(sock, F_GETFL) | O_ASYNC);
- // Get LL-addr
- FILE *fp = fopen("/proc/net/if_inet6", "r");
- if (fp) {
- char addrbuf[33], ifbuf[16];
- while (fscanf(fp, "%32s %*x %*x %*x %*x %15s", addrbuf, ifbuf) == 2) {
- if (!strcmp(ifbuf, if_name)) {
- script_unhexlify((uint8_t*)&lladdr, sizeof(lladdr), addrbuf);
- break;
+ if (IN6_IS_ADDR_UNSPECIFIED(&lladdr)) {
+ // Autodetect interface-id if not specified
+ FILE *fp = fopen("/proc/net/if_inet6", "r");
+ if (fp) {
+ char addrbuf[33], ifbuf[16];
+ while (fscanf(fp, "%32s %*x %*x %*x %*x %15s", addrbuf, ifbuf) == 2) {
+ if (!strcmp(ifbuf, if_name)) {
+ script_unhexlify((uint8_t*)&lladdr, sizeof(lladdr), addrbuf);
+ break;
+ }
}
+ fclose(fp);
}
- fclose(fp);
}
// Open rtnetlink socket
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 (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_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));
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, 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)
odhcp6c_update_entry(STATE_RA_ROUTE, &entry);
// Parse ND parameters
- if (adv->nd_ra_reachable)
+ if (ntohl(adv->nd_ra_reachable) <= 3600000)
update_proc("neigh", "base_reachable_time_ms", ntohl(adv->nd_ra_reachable));
- if (adv->nd_ra_retransmit)
+ if (ntohl(adv->nd_ra_retransmit) <= 60000)
update_proc("neigh", "retrans_time_ms", ntohl(adv->nd_ra_retransmit));
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];
+ if (ntohl(*mtu) >= 1280 && ntohl(*mtu) <= 65535)
+ 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)
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) {
entry[i].valid = router_valid;
}
- odhcp6c_expire();
+ if (found)
+ odhcp6c_expire();
+
return found;
}
projects / odhcp6c.git / blobdiff