/**
- * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
+ * Copyright (C) 2012-2014 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
*/
#include <fcntl.h>
+#include <ifaddrs.h>
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <sys/socket.h>
+#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/icmp6.h>
static volatile int rs_attempt = 0;
static struct in6_addr lladdr = IN6ADDR_ANY_INIT;
+struct {
+ struct icmp6_hdr hdr;
+ struct icmpv6_opt lladdr;
+} rs = {
+ .hdr = {ND_ROUTER_SOLICIT, 0, 0, {{0}}},
+ .lladdr = {ND_OPT_SOURCE_LINKADDR, 1, {0}},
+};
+
+
static void ra_send_rs(int signal __attribute__((unused)));
int ra_init(const char *ifname, const struct in6_addr *ifid)
.ifi = {.ifi_index = if_index}
};
send(rtnl, &req, sizeof(req), 0);
+ ra_link_up();
// Filter ICMPv6 package types
struct icmp6_filter filt;
static void ra_send_rs(int signal __attribute__((unused)))
{
- const struct icmp6_hdr rs = {ND_ROUTER_SOLICIT, 0, 0, {{0}}};
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));
+ const struct icmpv6_opt llnull = {ND_OPT_SOURCE_LINKADDR, 1, {0}};
+ size_t len;
+
+ if ((rs_attempt % 2 == 0) && memcmp(&rs.lladdr, &llnull, sizeof(llnull)))
+ len = sizeof(rs);
+ else
+ len = sizeof(struct icmp6_hdr);
+
+ sendto(sock, &rs, len, MSG_DONTWAIT, (struct sockaddr*)&dest, sizeof(dest));
if (++rs_attempt <= 3)
alarm(4);
resp.msg.ifi_index != if_index)
continue;
+ ssize_t alen = NLMSG_PAYLOAD(&resp.hdr, sizeof(resp.msg));
+ for (struct rtattr *rta = (struct rtattr*)(resp.pad);
+ RTA_OK(rta, alen); rta = RTA_NEXT(rta, alen)) {
+ if (rta->rta_type == IFLA_ADDRESS &&
+ RTA_PAYLOAD(rta) >= sizeof(rs.lladdr.data))
+ memcpy(rs.lladdr.data, RTA_DATA(rta), sizeof(rs.lladdr.data));
+ }
+
bool hascarrier = resp.msg.ifi_flags & IFF_LOWER_UP;
if (!firstcall && nocarrier != !hascarrier)
ret = true;
{
bool found = false;
bool changed = false;
+ bool has_lladdr = !IN6_IS_ADDR_UNSPECIFIED(&lladdr);
uint8_t buf[1500], cmsg_buf[128];
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, 0, 0};
+ struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0, IN6ADDR_ANY_INIT, 0, 0, 0, 0, 0, 0};
const struct in6_addr any = IN6ADDR_ANY_INIT;
- if (IN6_IS_ADDR_UNSPECIFIED(&lladdr)) {
+ if (!has_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);
+ struct ifaddrs *ifaddr, *ifa;
+
+ if (getifaddrs(&ifaddr) == 0) {
+ for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
+ struct sockaddr_in6 *addr;
+
+ if (ifa->ifa_addr == NULL || ifa->ifa_addr->sa_family != AF_INET6)
+ continue;
+
+ addr = (struct sockaddr_in6*)ifa->ifa_addr;
+
+ if (!IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr))
+ continue;
+
+ if (!strcmp(ifa->ifa_name, if_name)) {
+ lladdr = addr->sin6_addr;
+ has_lladdr = true;
break;
}
}
- fclose(fp);
+
+ freeifaddrs(ifaddr);
}
}
if (len <= 0)
break;
+ if (!has_lladdr)
+ continue;
+
int hlim = 0;
for (struct cmsghdr *ch = CMSG_FIRSTHDR(&msg); ch != NULL;
ch = CMSG_NXTHDR(&msg, ch))
update_proc("conf", "hop_limit", adv->nd_ra_curhoplimit);
// Parse ND parameters
- if (ntohl(adv->nd_ra_reachable) <= 3600000)
- update_proc("neigh", "base_reachable_time_ms", ntohl(adv->nd_ra_reachable));
+ uint32_t reachable = ntohl(adv->nd_ra_reachable);
+ if (reachable > 0 && reachable <= 3600000)
+ update_proc("neigh", "base_reachable_time_ms", reachable);
- if (ntohl(adv->nd_ra_retransmit) <= 60000)
- update_proc("neigh", "retrans_time_ms", ntohl(adv->nd_ra_retransmit));
+ uint32_t retransmit = ntohl(adv->nd_ra_retransmit);
+ if (retransmit > 0 && retransmit <= 60000)
+ update_proc("neigh", "retrans_time_ms", retransmit);
// Evaluate options