*/
#include <fcntl.h>
-#include <ifaddrs.h>
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/types.h>
-#include <sys/ioctl.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)))
{
- struct {
- struct icmp6_hdr hdr;
- struct icmpv6_opt lladdr;
- } rs = {
- .hdr = {ND_ROUTER_SOLICIT, 0, 0, {{0}}},
- .lladdr = {ND_OPT_SOURCE_LINKADDR, 1, {0}},
- };
const struct sockaddr_in6 dest = {AF_INET6, 0, 0, ALL_IPV6_ROUTERS, if_index};
- size_t len = sizeof(rs);
-
- struct ifreq ifr;
- memset(&ifr, 0, sizeof(ifr));
- strncpy(ifr.ifr_name, if_name, sizeof(ifr.ifr_name));
- if (!ioctl(sock, SIOCGIFHWADDR, &ifr)
- && memcmp(rs.lladdr.data, ifr.ifr_hwaddr.sa_data, 6))
- memcpy(rs.lladdr.data, ifr.ifr_hwaddr.sa_data, 6);
+ 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);
static int16_t pref_to_priority(uint8_t flags)
{
flags = (flags >> 3) & 0x03;
- return (flags == 0x0) ? 1024 : (flags == 0x1) ? 512 :
- (flags == 0x3) ? 2048 : -1;
+ return (flags == 0x0) ? 512 : (flags == 0x1) ? 384 :
+ (flags == 0x3) ? 640 : -1;
}
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, 0};
const struct in6_addr any = IN6ADDR_ANY_INIT;
- if (!has_lladdr) {
- // Autodetect interface-id if not specified
- struct ifaddrs *ifaddr, *ifa;
-
- if (getifaddrs(&ifaddr) == 0) {
- for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
- struct sockaddr_in6 *addr;
+ if (IN6_IS_ADDR_UNSPECIFIED(&lladdr)) {
+ struct sockaddr_in6 addr = {AF_INET6, 0, 0, ALL_IPV6_ROUTERS, if_index};
+ socklen_t alen = sizeof(addr);
+ int sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
- 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 (!connect(sock, (struct sockaddr*)&addr, sizeof(addr)) &&
+ !getsockname(sock, (struct sockaddr*)&addr, &alen))
+ lladdr = addr.sin6_addr;
- if (!strcmp(ifa->ifa_name, if_name)) {
- lladdr = addr->sin6_addr;
- has_lladdr = true;
- break;
- }
- }
-
- freeifaddrs(ifaddr);
- }
+ close(sock);
}
while (true) {
struct sockaddr_in6 from;
struct iovec iov = {buf, sizeof(buf)};
- struct msghdr msg = {&from, sizeof(from), &iov, 1,
- cmsg_buf, sizeof(cmsg_buf), 0};
+ struct msghdr msg = {
+ .msg_name = (void *) &from,
+ .msg_namelen = sizeof(from),
+ .msg_iov = &iov,
+ .msg_iovlen = 1,
+ .msg_control = cmsg_buf,
+ .msg_controllen = sizeof(cmsg_buf),
+ .msg_flags = 0
+ };
ssize_t len = recvmsg(sock, &msg, MSG_DONTWAIT);
if (len <= 0)
break;
- if (!has_lladdr)
+ if (IN6_IS_ADDR_UNSPECIFIED(&lladdr))
continue;
int hlim = 0;
entry.priority = pref_to_priority(0);
entry.valid = router_valid;
entry.preferred = entry.valid;
- changed |= odhcp6c_update_entry(STATE_RA_ROUTE, &entry);
+ changed |= odhcp6c_update_entry(STATE_RA_ROUTE, &entry, 0, true);
// Parse hoplimit
if (adv->nd_ra_curhoplimit)
continue;
if (entry.priority > 0)
- changed |= odhcp6c_update_entry(STATE_RA_ROUTE, &entry);
+ changed |= odhcp6c_update_entry(STATE_RA_ROUTE, &entry, 0, true);
} 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;
continue;
if (pinfo->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_ONLINK)
- changed |= odhcp6c_update_entry_safe(STATE_RA_ROUTE, &entry, 7200);
+ changed |= odhcp6c_update_entry(STATE_RA_ROUTE, &entry, 7200, true);
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];
- changed |= odhcp6c_update_entry_safe(STATE_RA_PREFIX, &entry, 7200);
+ changed |= odhcp6c_update_entry(STATE_RA_PREFIX, &entry, 7200, true);
} else if (opt->type == ND_OPT_RECURSIVE_DNS && opt->len > 2) {
entry.router = from.sin6_addr;
entry.priority = 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));
- changed |= odhcp6c_update_entry(STATE_RA_DNS, &entry);
+ changed |= odhcp6c_update_entry(STATE_RA_DNS, &entry, 0, true);
}
}
}
projects / odhcp6c.git / blobdiff