2 This file is part of systemd.
4 Copyright (C) 2013 Intel Corporation. All rights reserved.
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
21 #include <sys/types.h>
22 #include <sys/socket.h>
24 #include <linux/if_packet.h>
25 #include <net/ethernet.h>
28 #include <linux/filter.h>
30 #include "socket-util.h"
32 #include "dhcp-internal.h"
34 int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link)
36 struct sock_filter filter[] = {
37 BPF_STMT(BPF_LD + BPF_W + BPF_LEN, 0), /* A <- packet length */
38 BPF_JUMP(BPF_JMP + BPF_JGE + BPF_K, sizeof(DHCPPacket), 1, 0), /* packet >= DHCPPacket ? */
39 BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
40 BPF_STMT(BPF_LD + BPF_B + BPF_ABS, offsetof(DHCPPacket, ip.protocol)), /* A <- IP protocol */
41 BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_UDP, 1, 0), /* IP protocol == UDP ? */
42 BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
43 BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(DHCPPacket, udp.dest)), /* A <- UDP destination port */
44 BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, DHCP_PORT_CLIENT, 1, 0), /* UDP destination port == DHCP client port ? */
45 BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
46 BPF_STMT(BPF_RET + BPF_K, 65535), /* return all */
48 struct sock_fprog fprog = {
49 .len = ELEMENTSOF(filter),
57 s = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
61 link->ll.sll_family = AF_PACKET;
62 link->ll.sll_protocol = htons(ETH_P_IP);
63 link->ll.sll_ifindex = index;
64 link->ll.sll_halen = ETH_ALEN;
65 memset(link->ll.sll_addr, 0xff, ETH_ALEN);
67 if (setsockopt (s, SOL_PACKET, PACKET_AUXDATA, &one, sizeof(one)) < 0)
70 if (setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER, &fprog, sizeof(fprog)) < 0) {
74 if (bind(s, &link->sa, sizeof(link->ll)) < 0) {
82 int dhcp_network_bind_udp_socket(int index, be32_t address, uint16_t port)
85 union sockaddr_union src = {
86 .in.sin_family = AF_INET,
87 .in.sin_port = htobe16(port),
88 .in.sin_addr.s_addr = address,
91 s = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
95 if (bind(s, &src.sa, sizeof(src.in)) < 0) {
103 int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link,
104 const void *packet, size_t len)
110 if (sendto(s, packet, len, 0, &link->sa, sizeof(link->ll)) < 0)
116 int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port,
117 const void *packet, size_t len)
119 union sockaddr_union dest = {
120 .in.sin_family = AF_INET,
121 .in.sin_port = htobe16(port),
122 .in.sin_addr.s_addr = address,
125 if (sendto(s, packet, len, 0, &dest.sa, sizeof(dest.in)) < 0)