+/**
+ * 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>
#include <linux/rtnetlink.h>
+#ifndef SOL_NETLINK
+#define SOL_NETLINK 270
+#endif
+
+#ifndef NETLINK_ADD_MEMBERSHIP
+#define NETLINK_ADD_MEMBERSHIP 1
+#endif
+
+#ifndef IFF_LOWER_UP
+#define IFF_LOWER_UP 0x10000
+#endif
#include "odhcp6c.h"
#include "ra.h"
-static int sock = -1, rtnl_sock = -1;
-static unsigned if_index = 0;
+static bool nocarrier = false;
+
+static int sock = -1, rtnl = -1;
+static int 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)));
-int ra_init(const char *ifname)
+int ra_init(const char *ifname, const struct in6_addr *ifid)
{
+ const pid_t ourpid = getpid();
sock = socket(AF_INET6, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_ICMPV6);
+ if (sock < 0)
+ return -1;
+
if_index = if_nametoindex(ifname);
+ if (!if_index)
+ return -1;
+
strncpy(if_name, ifname, sizeof(if_name) - 1);
+ lladdr = *ifid;
+
+ rtnl = socket(AF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_ROUTE);
+ if (rtnl < 0)
+ return -1;
+
+ struct sockaddr_nl rtnl_kernel = { .nl_family = AF_NETLINK };
+ if (connect(rtnl, (const struct sockaddr*)&rtnl_kernel, sizeof(rtnl_kernel)) < 0)
+ return -1;
+
+ int val = RTNLGRP_LINK;
+ setsockopt(rtnl, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &val, sizeof(val));
+ fcntl(rtnl, F_SETOWN, ourpid);
+ fcntl(rtnl, F_SETFL, fcntl(sock, F_GETFL) | O_ASYNC);
+
+ struct {
+ struct nlmsghdr hdr;
+ struct ifinfomsg ifi;
+ } req = {
+ .hdr = {sizeof(req), RTM_GETLINK, NLM_F_REQUEST, 1, 0},
+ .ifi = {.ifi_index = if_index}
+ };
+ send(rtnl, &req, sizeof(req), 0);
// Filter ICMPv6 package types
struct icmp6_filter filt;
setsockopt(sock, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &an, sizeof(an));
// Let the kernel compute our checksums
- int val = 2;
+ val = 2;
setsockopt(sock, IPPROTO_RAW, IPV6_CHECKSUM, &val, sizeof(val));
// This is required by RFC 4861
val = 255;
setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &val, sizeof(val));
+ // Receive multicast hops
+ val = 1;
+ setsockopt(sock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &val, sizeof(val));
+
// Bind to one device
setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
// Add async-mode
- const pid_t ourpid = getpid();
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;
- }
- }
- fclose(fp);
- }
-
- // Open rtnetlink socket
- rtnl_sock = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
- struct sockaddr_nl rtnl_kernel = { .nl_family = AF_NETLINK };
- if (connect(rtnl_sock, (struct sockaddr*)&rtnl_kernel, sizeof(rtnl_kernel)))
- return -1;
- uint32_t group = RTNLGRP_IPV6_IFADDR;
- setsockopt(rtnl_sock, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &group, sizeof(group));
-
- // Add async-mode
- fcntl(rtnl_sock, F_SETOWN, ourpid);
- fcntl(rtnl_sock, F_SETFL, fcntl(rtnl_sock, F_GETFL) | O_ASYNC);
-
// Send RS
signal(SIGALRM, ra_send_rs);
ra_send_rs(SIGALRM);
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;
}
}
-static bool ra_deduplicate(const struct in6_addr *any, uint8_t length)
+bool ra_link_up(void)
{
- 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) {
- 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);
- raise(SIGUSR2);
- }
+ static bool firstcall = true;
+ struct {
+ struct nlmsghdr hdr;
+ struct ifinfomsg msg;
+ uint8_t pad[4000];
+ } resp;
+
+ bool ret = false;
+ ssize_t read;
+
+ do {
+ read = recv(rtnl, &resp, sizeof(resp), MSG_DONTWAIT);
+ if (read < 0 || !NLMSG_OK(&resp.hdr, (size_t)read) ||
+ resp.hdr.nlmsg_type != RTM_NEWLINK ||
+ resp.msg.ifi_index != if_index)
+ continue;
- return !!x;
-}
+ bool hascarrier = resp.msg.ifi_flags & IFF_LOWER_UP;
+ if (!firstcall && nocarrier != !hascarrier)
+ ret = true;
+ nocarrier = !hascarrier;
+ firstcall = false;
+ } while (read > 0);
-bool ra_rtnl_process(void)
-{
- bool found = false;
- uint8_t buf[8192];
- while (true) {
- ssize_t len = recv(rtnl_sock, buf, sizeof(buf), MSG_DONTWAIT);
- if (len < 0)
- break;
+ if (ret) {
+ syslog(LOG_NOTICE, "carrier => %i event on %s", (int)!nocarrier, if_name);
- 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)
- 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))
- addr = RTA_DATA(rta);
-
- if (addr)
- found |= ra_deduplicate(addr, ifa->ifa_prefixlen);
- }
+ rs_attempt = 0;
+ ra_send_rs(SIGALRM);
}
- return found;
-}
+ return ret;
+}
bool ra_process(void)
{
bool found = false;
- uint8_t buf[1500];
+ bool changed = false;
+ 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};
+ struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0, IN6ADDR_ANY_INIT, 0, 0, 0, 0, 0};
const struct in6_addr any = IN6ADDR_ANY_INIT;
- odhcp6c_expire();
+
+ 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);
+ }
+ }
while (true) {
struct sockaddr_in6 from;
- socklen_t from_len = sizeof(from);
- ssize_t len = recvfrom(sock, buf, sizeof(buf), MSG_DONTWAIT, &from, &from_len);
+ struct iovec iov = {buf, sizeof(buf)};
+ struct msghdr msg = {&from, sizeof(from), &iov, 1,
+ cmsg_buf, sizeof(cmsg_buf), 0};
+
+ ssize_t len = recvmsg(sock, &msg, MSG_DONTWAIT);
if (len < 0)
break;
else if (len < (ssize_t)sizeof(*adv))
continue;
+ int hlim = 0;
+ for (struct cmsghdr *ch = CMSG_FIRSTHDR(&msg); ch != NULL;
+ ch = CMSG_NXTHDR(&msg, ch))
+ if (ch->cmsg_level == IPPROTO_IPV6 &&
+ ch->cmsg_type == IPV6_HOPLIMIT)
+ memcpy(&hlim, CMSG_DATA(ch), sizeof(hlim));
+
+ if (hlim != 255)
+ continue;
+
// Stop sending solicits
if (rs_attempt > 0) {
alarm(0);
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)
entry.priority = pref_to_priority(0);
entry.valid = router_valid;
entry.preferred = entry.valid;
- odhcp6c_update_entry(STATE_RA_ROUTE, &entry);
+ changed |= 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)
continue;
if (entry.priority > 0)
- odhcp6c_update_entry(STATE_RA_ROUTE, &entry);
+ changed |= odhcp6c_update_entry(STATE_RA_ROUTE, &entry);
} else if (opt->type == ND_OPT_PREFIX_INFORMATION && opt->len == 4) {
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);
continue;
if (pinfo->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_ONLINK)
- odhcp6c_update_entry_safe(STATE_RA_ROUTE, &entry, 7200);
+ changed |= odhcp6c_update_entry_safe(STATE_RA_ROUTE, &entry, 7200);
if (!(pinfo->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_AUTO) ||
pinfo->nd_opt_pi_prefix_len != 64)
entry.target.s6_addr32[2] = lladdr.s6_addr32[2];
entry.target.s6_addr32[3] = lladdr.s6_addr32[3];
- odhcp6c_update_entry_safe(STATE_RA_PREFIX, &entry, 7200);
+ changed |= odhcp6c_update_entry_safe(STATE_RA_PREFIX, &entry, 7200);
} else if (opt->type == ND_OPT_RECURSIVE_DNS && opt->len > 2) {
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) {
memcpy(&entry.target, &opt->data[6 + i * sizeof(entry.target)],
sizeof(entry.target));
- odhcp6c_update_entry(STATE_RA_DNS, &entry);
+ changed |= odhcp6c_update_entry(STATE_RA_DNS, &entry);
}
}
}
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();
- return found;
+ if (found)
+ odhcp6c_expire();
+
+ return found && changed;
}
projects / odhcp6c.git / blobdiff