+/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
***/
#include <errno.h>
-#include <sys/socket.h>
-#include <string.h>
-#include <linux/if_packet.h>
-#include <linux/if_infiniband.h>
#include <net/ethernet.h>
+#include <net/if.h>
#include <net/if_arp.h>
#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
#include <linux/filter.h>
-
-#include "socket-util.h"
+#include <linux/if_infiniband.h>
+#include <linux/if_packet.h>
#include "dhcp-internal.h"
+#include "fd-util.h"
+#include "socket-util.h"
static int _bind_raw_socket(int ifindex, union sockaddr_union *link,
uint32_t xid, const uint8_t *mac_addr,
size_t mac_addr_len,
const uint8_t *bcast_addr,
const struct ether_addr *eth_mac,
- uint16_t arp_type, uint8_t dhcp_hlen) {
+ uint16_t arp_type, uint8_t dhcp_hlen,
+ uint16_t port) {
struct sock_filter filter[] = {
BPF_STMT(BPF_LD + BPF_W + BPF_LEN, 0), /* A <- packet length */
BPF_JUMP(BPF_JMP + BPF_JGE + BPF_K, sizeof(DHCPPacket), 1, 0), /* packet >= DHCPPacket ? */
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0, 1, 0), /* A == 0 ? */
BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(DHCPPacket, udp.dest)), /* A <- UDP destination port */
- BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, DHCP_PORT_CLIENT, 1, 0), /* UDP destination port == DHCP client port ? */
+ BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, port, 1, 0), /* UDP destination port == DHCP client port ? */
BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
BPF_STMT(BPF_LD + BPF_B + BPF_ABS, offsetof(DHCPPacket, dhcp.op)), /* A <- DHCP op */
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, BOOTREPLY, 1, 0), /* op == BOOTREPLY ? */
if (r < 0)
return -errno;
- link->ll.sll_family = AF_PACKET;
- link->ll.sll_protocol = htons(ETH_P_IP);
- link->ll.sll_ifindex = ifindex;
- link->ll.sll_hatype = htons(arp_type);
- link->ll.sll_halen = mac_addr_len;
+ link->ll = (struct sockaddr_ll) {
+ .sll_family = AF_PACKET,
+ .sll_protocol = htobe16(ETH_P_IP),
+ .sll_ifindex = ifindex,
+ .sll_hatype = htobe16(arp_type),
+ .sll_halen = mac_addr_len,
+ };
memcpy(link->ll.sll_addr, bcast_addr, mac_addr_len);
- r = bind(s, &link->sa, sizeof(link->ll));
+ r = bind(s, &link->sa, SOCKADDR_LL_LEN(link->ll));
if (r < 0)
return -errno;
int dhcp_network_bind_raw_socket(int ifindex, union sockaddr_union *link,
uint32_t xid, const uint8_t *mac_addr,
- size_t mac_addr_len, uint16_t arp_type) {
+ size_t mac_addr_len, uint16_t arp_type,
+ uint16_t port) {
static const uint8_t eth_bcast[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
/* Default broadcast address for IPoIB */
static const uint8_t ib_bcast[] = {
return -EINVAL;
return _bind_raw_socket(ifindex, link, xid, mac_addr, mac_addr_len,
- bcast_addr, ð_mac, arp_type, dhcp_hlen);
+ bcast_addr, ð_mac, arp_type, dhcp_hlen, port);
}
-int dhcp_network_bind_udp_socket(be32_t address, uint16_t port) {
+int dhcp_network_bind_udp_socket(int ifindex, be32_t address, uint16_t port) {
union sockaddr_union src = {
.in.sin_family = AF_INET,
.in.sin_port = htobe16(port),
.in.sin_addr.s_addr = address,
};
_cleanup_close_ int s = -1;
+ char ifname[IF_NAMESIZE] = "";
int r, on = 1, tos = IPTOS_CLASS_CS6;
s = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
if (r < 0)
return -errno;
+ if (ifindex > 0) {
+ if (if_indextoname(ifindex, ifname) == 0)
+ return -errno;
+
+ r = setsockopt(s, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
+ if (r < 0)
+ return -errno;
+ }
+
if (address == INADDR_ANY) {
r = setsockopt(s, IPPROTO_IP, IP_PKTINFO, &on, sizeof(on));
if (r < 0)
r = setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on));
if (r < 0)
return -errno;
+
} else {
r = setsockopt(s, IPPROTO_IP, IP_FREEBIND, &on, sizeof(on));
if (r < 0)
assert(packet);
assert(len);
- r = sendto(s, packet, len, 0, &link->sa, sizeof(link->ll));
+ r = sendto(s, packet, len, 0, &link->sa, SOCKADDR_LL_LEN(link->ll));
if (r < 0)
return -errno;