/**
* 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 "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] __aligned(4);
- uint8_t cmsg_buf[128] __aligned(__alignof__(struct cmsghdr));
+ 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 = alloca(sizeof(*entry) + 256);
const struct in6_addr any = IN6ADDR_ANY_INIT;
.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
};
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);
+ changed |= odhcp6c_update_entry(STATE_RA_ROUTE, entry,
+ 0, ra_holdoff_interval);
// Parse hoplimit
ra_conf_hoplimit(adv->nd_ra_curhoplimit);
continue;
if (entry->priority > 0)
- changed |= odhcp6c_update_entry(STATE_RA_ROUTE, entry, 0, true);
+ 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;
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)
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;
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);
+ 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];
if (entry->auxlen == 0)
continue;
- changed |= odhcp6c_update_entry(STATE_RA_SEARCH, entry, 0, true);
+ changed |= odhcp6c_update_entry(STATE_RA_SEARCH, entry,
+ 0, ra_holdoff_interval);
entry->auxlen = 0;
}
}
}
- 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 (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;
+ }
+ }
}
}