#include "dhcpv4.h"
#include "dhcpv6.h"
+static void dhcpv4_netevent_cb(unsigned long event, struct netevent_handler_info *info);
static int setup_dhcpv4_addresses(struct interface *iface);
static void update_static_assignments(struct interface *iface);
static void valid_until_cb(struct uloop_timeout *event);
+static void handle_addrlist_change(struct interface *iface);
static void free_dhcpv4_assignment(struct dhcpv4_assignment *a);
static void dhcpv4_fr_start(struct dhcpv4_assignment *a);
static void dhcpv4_fr_stop(struct dhcpv4_assignment *a);
static void handle_dhcpv4(void *addr, void *data, size_t len,
struct interface *iface, void *dest_addr);
static struct dhcpv4_assignment* dhcpv4_lease(struct interface *iface,
- enum dhcpv4_msg msg, const uint8_t *mac, struct in_addr reqaddr,
+ enum dhcpv4_msg msg, const uint8_t *mac, const uint32_t reqaddr,
uint32_t *leasetime, const char *hostname, const size_t hostname_len,
const bool accept_fr_nonce, bool *incl_fr_opt, uint32_t *fr_serverid);
+static struct netevent_handler dhcpv4_netevent_handler = { .cb = dhcpv4_netevent_cb, };
static struct uloop_timeout valid_until_timeout = {.cb = valid_until_cb};
static uint32_t serial = 0;
};
/* Create socket and register events */
-int init_dhcpv4(void)
+int dhcpv4_init(void)
{
uloop_timeout_set(&valid_until_timeout, 1000);
+ netlink_add_netevent_handler(&dhcpv4_netevent_handler);
+
return 0;
}
-int setup_dhcpv4_interface(struct interface *iface, bool enable)
+int dhcpv4_setup_interface(struct interface *iface, bool enable)
{
+ int ret = 0;
+
if (iface->dhcpv4_event.uloop.fd > 0) {
uloop_fd_delete(&iface->dhcpv4_event.uloop);
close(iface->dhcpv4_event.uloop.fd);
}
if (iface->dhcpv4 && enable) {
+ struct sockaddr_in bind_addr = {AF_INET, htons(DHCPV4_SERVER_PORT),
+ {INADDR_ANY}, {0}};
+ int val = 1;
+
if (!iface->dhcpv4_assignments.next)
INIT_LIST_HEAD(&iface->dhcpv4_assignments);
if (!iface->dhcpv4_fr_ips.next)
INIT_LIST_HEAD(&iface->dhcpv4_fr_ips);
- int sock = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
- if (sock < 0) {
- syslog(LOG_ERR, "Failed to create DHCPv4 server socket: %s",
- strerror(errno));
- return -1;
+ iface->dhcpv4_event.uloop.fd = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
+ if (iface->dhcpv4_event.uloop.fd < 0) {
+ syslog(LOG_ERR, "socket(AF_INET): %m");
+ ret = -1;
+ goto out;
}
/* Basic IPv4 configuration */
- int val = 1;
- setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
- setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &val, sizeof(val));
- setsockopt(sock, IPPROTO_IP, IP_PKTINFO, &val, sizeof(val));
+ if (setsockopt(iface->dhcpv4_event.uloop.fd, SOL_SOCKET, SO_REUSEADDR,
+ &val, sizeof(val)) < 0) {
+ syslog(LOG_ERR, "setsockopt(SO_REUSEADDR): %m");
+ ret = -1;
+ goto out;
+ }
+
+ if (setsockopt(iface->dhcpv4_event.uloop.fd, SOL_SOCKET, SO_BROADCAST,
+ &val, sizeof(val)) < 0) {
+ syslog(LOG_ERR, "setsockopt(SO_BROADCAST): %m");
+ ret = -1;
+ goto out;
+ }
+
+ if (setsockopt(iface->dhcpv4_event.uloop.fd, IPPROTO_IP, IP_PKTINFO,
+ &val, sizeof(val)) < 0) {
+ syslog(LOG_ERR, "setsockopt(IP_PKTINFO): %m");
+ ret = -1;
+ goto out;
+ }
val = IPTOS_PREC_INTERNETCONTROL;
- setsockopt(sock, IPPROTO_IP, IP_TOS, &val, sizeof(val));
+ if (setsockopt(iface->dhcpv4_event.uloop.fd, IPPROTO_IP, IP_TOS,
+ &val, sizeof(val)) < 0) {
+ syslog(LOG_ERR, "setsockopt(IP_TOS): %m");
+ ret = -1;
+ goto out;
+ }
val = IP_PMTUDISC_DONT;
- setsockopt(sock, IPPROTO_IP, IP_MTU_DISCOVER, &val, sizeof(val));
+ if (setsockopt(iface->dhcpv4_event.uloop.fd, IPPROTO_IP, IP_MTU_DISCOVER,
+ &val, sizeof(val)) < 0) {
+ syslog(LOG_ERR, "setsockopt(IP_MTU_DISCOVER): %m");
+ ret = -1;
+ goto out;
+ }
- setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE,
- iface->ifname, strlen(iface->ifname));
+ if (setsockopt(iface->dhcpv4_event.uloop.fd, SOL_SOCKET, SO_BINDTODEVICE,
+ iface->ifname, strlen(iface->ifname)) < 0) {
+ syslog(LOG_ERR, "setsockopt(SO_BINDTODEVICE): %m");
+ ret = -1;
+ goto out;
+ }
- struct sockaddr_in bind_addr = {AF_INET, htons(DHCPV4_SERVER_PORT),
- {INADDR_ANY}, {0}};
+ if (bind(iface->dhcpv4_event.uloop.fd, (struct sockaddr*)&bind_addr,
+ sizeof(bind_addr)) < 0) {
+ syslog(LOG_ERR, "bind(): %m");
+ ret = -1;
+ goto out;
+ }
- if (bind(sock, (struct sockaddr*)&bind_addr, sizeof(bind_addr))) {
- syslog(LOG_ERR, "Failed to open DHCPv4 server socket: %s",
- strerror(errno));
- return -1;
+ if (setup_dhcpv4_addresses(iface) < 0) {
+ ret = -1;
+ goto out;
}
- iface->dhcpv4_event.uloop.fd = sock;
iface->dhcpv4_event.handle_dgram = handle_dhcpv4;
odhcpd_register(&iface->dhcpv4_event);
- if (setup_dhcpv4_addresses(iface) < 0)
- return -1;
-
update_static_assignments(iface);
} else if (iface->dhcpv4_assignments.next) {
while (!list_empty(&iface->dhcpv4_assignments))
free_dhcpv4_assignment(list_first_entry(&iface->dhcpv4_assignments,
struct dhcpv4_assignment, head));
}
- return 0;
+
+out:
+ if (ret < 0 && iface->dhcpv4_event.uloop.fd > 0) {
+ close(iface->dhcpv4_event.uloop.fd);
+ iface->dhcpv4_event.uloop.fd = -1;
+ }
+
+ return ret;
+}
+
+
+static void dhcpv4_netevent_cb(unsigned long event, struct netevent_handler_info *info)
+{
+ struct interface *iface = info->iface;
+
+ if (!iface || iface->dhcpv4 == MODE_DISABLED)
+ return;
+
+ switch (event) {
+ case NETEV_IFINDEX_CHANGE:
+ dhcpv4_setup_interface(iface, true);
+ break;
+ case NETEV_ADDRLIST_CHANGE:
+ handle_addrlist_change(iface);
+ break;
+ default:
+ break;
+ }
}
static struct dhcpv4_assignment *find_assignment_by_hwaddr(struct interface *iface, const uint8_t *hwaddr)
struct odhcpd_ref_ip *ip = *ptr;
if (--ip->ref_cnt == 0) {
- odhcpd_setup_addr(&ip->addr, iface, false, false);
+ netlink_setup_addr(&ip->addr, iface->ifindex, false, false);
list_del(&ip->head);
free(ip);
uloop_timeout_set(event, 1000);
}
-void dhcpv4_addr_update(struct interface *iface)
+static void handle_addrlist_change(struct interface *iface)
{
- if (iface->dhcpv4 == MODE_DISABLED)
- return;
-
struct odhcpd_ipaddr ip;
struct odhcpd_ref_ip *a;
struct dhcpv4_assignment *c;
uint32_t mask = iface->dhcpv4_mask.s_addr;
- memset(&ip, sizeof(ip), 0);
+ memset(&ip, 0, sizeof(ip));
ip.addr.in = iface->dhcpv4_local;
ip.prefix = odhcpd_netmask2bitlen(false, &iface->dhcpv4_mask);
ip.broadcast = iface->dhcpv4_bcast;
a = list_first_entry(&iface->dhcpv4_fr_ips, struct odhcpd_ref_ip, head);
- if (odhcpd_setup_addr(&a->addr, iface, false, true)) {
+ if (netlink_setup_addr(&a->addr, iface->ifindex, false, true)) {
syslog(LOG_ERR, "Failed to add ip address");
return;
}
uint8_t type, uint8_t len, const void *data)
{
uint8_t *c = *cookie;
- if (*cookie + 2 + len > (uint8_t*)&msg[1])
+ uint8_t *end = (uint8_t *)msg + sizeof(*msg);
+
+ if (*cookie + 2 + len > end)
return;
*c++ = type;
uint8_t reqmsg = DHCPV4_MSG_REQUEST;
uint8_t msg = DHCPV4_MSG_ACK;
- struct in_addr reqaddr = {INADDR_ANY};
+ uint32_t reqaddr = INADDR_ANY;
uint32_t leasetime = 0;
size_t hostname_len = 0;
char hostname[256];
} else if (reqmsg == DHCPV4_MSG_DISCOVER)
msg = DHCPV4_MSG_OFFER;
else if (reqmsg == DHCPV4_MSG_REQUEST &&
- ((reqaddr.s_addr && reqaddr.s_addr != lease->addr) ||
+ ((reqaddr && reqaddr != lease->addr) ||
(req->ciaddr.s_addr && req->ciaddr.s_addr != lease->addr))) {
msg = DHCPV4_MSG_NAK;
/*
req->chaddr[0],req->chaddr[1],req->chaddr[2],
req->chaddr[3],req->chaddr[4],req->chaddr[5]);
+#ifdef WITH_UBUS
+ if (reqmsg == DHCPV4_MSG_RELEASE)
+ ubus_bcast_dhcp_event("dhcp.release", req->chaddr, req->hlen,
+ &req->ciaddr, hostname, iface->ifname);
+#endif
if (reqmsg == DHCPV4_MSG_DECLINE || reqmsg == DHCPV4_MSG_RELEASE)
return;
}
}
- struct ifreq ifr = {.ifr_name = ""};
- strncpy(ifr.ifr_name, iface->ifname, sizeof(ifr.ifr_name));
+ struct ifreq ifr;
+
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_name, iface->ifname, sizeof(ifr.ifr_name) - 1);
if (!ioctl(sock, SIOCGIFMTU, &ifr)) {
uint16_t mtu = htons(ifr.ifr_mtu);
sendto(sock, &reply, sizeof(reply), MSG_DONTWAIT,
(struct sockaddr*)&dest, sizeof(dest));
+
+#ifdef WITH_UBUS
+ if (msg == DHCPV4_MSG_ACK)
+ ubus_bcast_dhcp_event("dhcp.ack", req->chaddr, req->hlen, &reply.yiaddr,
+ hostname, iface->ifname);
+#endif
}
static bool dhcpv4_assign(struct interface *iface,
static struct dhcpv4_assignment* dhcpv4_lease(struct interface *iface,
- enum dhcpv4_msg msg, const uint8_t *mac, struct in_addr reqaddr,
+ enum dhcpv4_msg msg, const uint8_t *mac, const uint32_t reqaddr,
uint32_t *leasetime, const char *hostname, const size_t hostname_len,
const bool accept_fr_nonce, bool *incl_fr_opt, uint32_t *fr_serverid)
{
+ struct dhcpv4_assignment *a = find_assignment_by_hwaddr(iface, mac);
struct dhcpv4_assignment *lease = NULL;
time_t now = odhcpd_time();
- struct dhcpv4_assignment *c, *a = NULL;
- list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
- if (!memcmp(c->hwaddr, mac, 6)) {
- a = c;
- if (c->addr == reqaddr.s_addr)
- break;
- }
- }
-
if (a && (a->flags & OAF_BOUND) && a->fr_ip) {
*fr_serverid = a->fr_ip->addr.addr.in.s_addr;
dhcpv4_fr_stop(a);
/* Don't consider new assignment as infinite */
a->valid_until = now;
- assigned = dhcpv4_assign(iface, a, reqaddr.s_addr);
+ assigned = dhcpv4_assign(iface, a, reqaddr);
if (assigned) {
a->iface = iface;
list_add(&a->head, &iface->dhcpv4_assignments);
(iface->dhcpv4_start_ip.s_addr & iface->dhcpv4_mask.s_addr)) {
list_del(&a->head);
- assigned = dhcpv4_assign(iface, a, reqaddr.s_addr);
+ assigned = dhcpv4_assign(iface, a, reqaddr);
if (assigned)
list_add(&a->head, &iface->dhcpv4_assignments);
}
projects / project / odhcpd.git / blobdiff