/**
* Copyright (C) 2012-2014 Steven Barth <steven@midlink.org>
+ * Copyright (C) 2017-2018 Hans Dedecker <dedeckeh@gmail.com>
*
* 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 <stdbool.h>
#include <syslog.h>
#include <unistd.h>
+#include <resolv.h>
+#include <alloca.h>
#include <net/if.h>
#include <arpa/inet.h>
#include "odhcp6c.h"
#include "ra.h"
-
static bool nocarrier = false;
static int sock = -1, rtnl = -1;
static char if_name[IF_NAMESIZE] = {0};
static volatile int rs_attempt = 0;
static struct in6_addr lladdr = IN6ADDR_ANY_INIT;
+static unsigned int ra_options = 0;
+static unsigned int ra_holdoff_interval = 0;
struct {
struct icmp6_hdr hdr;
.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)
+int ra_init(const char *ifname, const struct in6_addr *ifid,
+ unsigned int options, unsigned int holdoff_interval)
{
+ ra_options = options;
+ ra_holdoff_interval = holdoff_interval;
+
const pid_t ourpid = getpid();
sock = socket(AF_INET6, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_ICMPV6);
if (sock < 0)
return 0;
}
-
static void ra_send_rs(int signal __attribute__((unused)))
{
const struct sockaddr_in6 dest = {AF_INET6, 0, 0, ALL_IPV6_ROUTERS, if_index};
alarm(4);
}
-
static int16_t pref_to_priority(uint8_t flags)
{
flags = (flags >> 3) & 0x03;
+
return (flags == 0x0) ? 512 : (flags == 0x1) ? 384 :
(flags == 0x3) ? 640 : -1;
}
-
bool ra_link_up(void)
{
static bool firstcall = true;
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)
int ra_conf_hoplimit(int newvalue)
{
static int value = 0;
+
if (newvalue > 0)
value = newvalue;
+
return value;
}
int ra_conf_mtu(int newvalue)
{
static int value = 0;
+
if (newvalue >= 1280 && newvalue <= 65535)
value = newvalue;
+
return value;
}
int ra_conf_reachable(int newvalue)
{
static int value = 0;
+
if (newvalue > 0 && newvalue <= 3600000)
value = newvalue;
+
return value;
}
int ra_conf_retransmit(int newvalue)
{
static int value = 0;
+
if (newvalue > 0 && newvalue <= 60000)
value = newvalue;
+
return value;
}
{
bool found = false;
bool changed = false;
- uint8_t buf[1500], cmsg_buf[128];
+ uint8_t buf[1500] _aligned(4);
+ union {
+ struct cmsghdr hdr;
+ uint8_t buf[CMSG_SPACE(sizeof(int))];
+ } cmsg_buf;
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};
+ struct odhcp6c_entry *entry = alloca(sizeof(*entry) + 256);
const struct in6_addr any = IN6ADDR_ANY_INIT;
+ memset(entry, 0, sizeof(*entry));
+
if (IN6_IS_ADDR_UNSPECIFIED(&lladdr)) {
struct sockaddr_in6 addr = {AF_INET6, 0, 0, ALL_IPV6_ROUTERS, if_index};
socklen_t alen = sizeof(addr);
.msg_namelen = sizeof(from),
.msg_iov = &iov,
.msg_iovlen = 1,
- .msg_control = cmsg_buf,
+ .msg_control = cmsg_buf.buf,
.msg_controllen = sizeof(cmsg_buf),
.msg_flags = 0
};
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;
- changed |= odhcp6c_update_entry(STATE_RA_ROUTE, &entry, 0, true);
+ 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;
+ changed |= odhcp6c_update_entry(STATE_RA_ROUTE, entry,
+ 0, ra_holdoff_interval);
// Parse hoplimit
ra_conf_hoplimit(adv->nd_ra_curhoplimit);
uint32_t *mtu = (uint32_t*)&opt->data[2];
ra_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->router = from.sin6_addr;
+ entry->target = any;
+ entry->priority = pref_to_priority(opt->data[1]);
+ entry->length = opt->data[0];
uint32_t *valid = (uint32_t*)&opt->data[2];
- entry.valid = ntohl(*valid);
- memcpy(&entry.target, &opt->data[6], (opt->len - 1) * 8);
+ entry->valid = ntohl(*valid);
+ memcpy(&entry->target, &opt->data[6], (opt->len - 1) * 8);
- if (entry.length > 128 || IN6_IS_ADDR_LINKLOCAL(&entry.target)
- || IN6_IS_ADDR_LOOPBACK(&entry.target)
- || IN6_IS_ADDR_MULTICAST(&entry.target))
+ if (entry->length > 128 || IN6_IS_ADDR_LINKLOCAL(&entry->target)
+ || IN6_IS_ADDR_LOOPBACK(&entry->target)
+ || IN6_IS_ADDR_MULTICAST(&entry->target))
continue;
- if (entry.priority > 0)
- changed |= odhcp6c_update_entry(STATE_RA_ROUTE, &entry, 0, true);
+ if (entry->priority > 0)
+ changed |= odhcp6c_update_entry(STATE_RA_ROUTE, entry,
+ 0, ra_holdoff_interval);
} 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 = 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);
-
- if (entry.length > 128 || IN6_IS_ADDR_LINKLOCAL(&entry.target)
- || IN6_IS_ADDR_LOOPBACK(&entry.target)
- || IN6_IS_ADDR_MULTICAST(&entry.target)
- || entry.valid < entry.preferred)
+ entry->router = any;
+ entry->target = pinfo->nd_opt_pi_prefix;
+ 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);
+
+ if (entry->length > 128 || IN6_IS_ADDR_LINKLOCAL(&entry->target)
+ || IN6_IS_ADDR_LOOPBACK(&entry->target)
+ || IN6_IS_ADDR_MULTICAST(&entry->target)
+ || entry->valid < entry->preferred)
continue;
if (pinfo->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_ONLINK)
- changed |= odhcp6c_update_entry(STATE_RA_ROUTE, &entry, 7200, true);
+ changed |= odhcp6c_update_entry(STATE_RA_ROUTE, entry,
+ 7200, ra_holdoff_interval);
if (!(pinfo->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_AUTO) ||
pinfo->nd_opt_pi_prefix_len != 64)
continue;
- entry.target.s6_addr32[2] = lladdr.s6_addr32[2];
- entry.target.s6_addr32[3] = lladdr.s6_addr32[3];
+ entry->target.s6_addr32[2] = lladdr.s6_addr32[2];
+ entry->target.s6_addr32[3] = lladdr.s6_addr32[3];
- changed |= odhcp6c_update_entry(STATE_RA_PREFIX, &entry, 7200, true);
+ changed |= odhcp6c_update_entry(STATE_RA_PREFIX, entry,
+ 7200, ra_holdoff_interval);
} else if (opt->type == ND_OPT_RECURSIVE_DNS && opt->len > 2) {
- entry.router = from.sin6_addr;
- entry.priority = 0;
- entry.length = 128;
+ entry->router = from.sin6_addr;
+ entry->priority = 0;
+ entry->length = 128;
uint32_t *valid = (uint32_t*)&opt->data[2];
- entry.valid = ntohl(*valid);
- entry.preferred = 0;
+ 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));
- changed |= odhcp6c_update_entry(STATE_RA_DNS, &entry, 0, true);
+ memcpy(&entry->target, &opt->data[6 + i * sizeof(entry->target)],
+ sizeof(entry->target));
+ changed |= odhcp6c_update_entry(STATE_RA_DNS, entry,
+ 0, ra_holdoff_interval);
+ }
+ } else if (opt->type == ND_OPT_DNSSL && opt->len > 1) {
+ uint32_t *valid = (uint32_t*)&opt->data[2];
+ uint8_t *buf = &opt->data[6];
+ uint8_t *end = &buf[(opt->len - 1) * 8];
+
+ entry->router = from.sin6_addr;
+ entry->valid = ntohl(*valid);
+
+ while (buf < end) {
+ int len = dn_expand(buf, end, buf, (char*)entry->auxtarget, 256);
+ if (len < 1)
+ break;
+
+ buf = &buf[len];
+ entry->auxlen = strlen((char*)entry->auxtarget);
+
+ if (entry->auxlen == 0)
+ continue;
+
+ changed |= odhcp6c_update_entry(STATE_RA_SEARCH, entry,
+ 0, ra_holdoff_interval);
+ entry->auxlen = 0;
}
}
}
- size_t ra_dns_len;
- struct odhcp6c_entry *entry = odhcp6c_get_state(STATE_RA_DNS, &ra_dns_len);
- 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;
+ if (ra_options & RA_RDNSS_DEFAULT_LIFETIME) {
+ int states[2] = {STATE_RA_DNS, STATE_RA_SEARCH};
+
+ for (size_t i = 0; i < 2; ++i) {
+ size_t ra_dns_len;
+ uint8_t *start = odhcp6c_get_state(states[i], &ra_dns_len);
+
+ for (struct odhcp6c_entry *c = (struct odhcp6c_entry*)start;
+ (uint8_t*)c < &start[ra_dns_len] &&
+ (uint8_t*)odhcp6c_next_entry(c) <= &start[ra_dns_len];
+ c = odhcp6c_next_entry(c)) {
+ if (IN6_ARE_ADDR_EQUAL(&c->router, &from.sin6_addr) &&
+ c->valid > router_valid)
+ c->valid = router_valid;
+ }
+ }
+ }
}
if (found)
projects / project / odhcp6c.git / blobdiff