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8b4a9693 PF |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright (C) 2013 Intel Corporation. All rights reserved. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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/>. | |
18 | ***/ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <sys/types.h> | |
22 | #include <sys/socket.h> | |
23 | #include <string.h> | |
24 | #include <linux/if_packet.h> | |
25 | #include <net/ethernet.h> | |
7429b07f | 26 | #include <net/if_arp.h> |
8b4a9693 PF |
27 | #include <stdio.h> |
28 | #include <unistd.h> | |
bc29e507 | 29 | #include <linux/filter.h> |
8b4a9693 PF |
30 | |
31 | #include "socket-util.h" | |
32 | ||
33 | #include "dhcp-internal.h" | |
34 | ||
c3d2994b TG |
35 | int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link, |
36 | uint32_t xid) { | |
bc29e507 | 37 | struct sock_filter filter[] = { |
0c79c68d TG |
38 | BPF_STMT(BPF_LD + BPF_W + BPF_LEN, 0), /* A <- packet length */ |
39 | BPF_JUMP(BPF_JMP + BPF_JGE + BPF_K, sizeof(DHCPPacket), 1, 0), /* packet >= DHCPPacket ? */ | |
40 | BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */ | |
7429b07f | 41 | /* TODO: match ip.version */ |
bc29e507 | 42 | BPF_STMT(BPF_LD + BPF_B + BPF_ABS, offsetof(DHCPPacket, ip.protocol)), /* A <- IP protocol */ |
0c79c68d | 43 | BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_UDP, 1, 0), /* IP protocol == UDP ? */ |
bc29e507 TG |
44 | BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */ |
45 | BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(DHCPPacket, udp.dest)), /* A <- UDP destination port */ | |
0c79c68d | 46 | BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, DHCP_PORT_CLIENT, 1, 0), /* UDP destination port == DHCP client port ? */ |
bc29e507 | 47 | BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */ |
7429b07f TG |
48 | BPF_STMT(BPF_LD + BPF_B + BPF_ABS, offsetof(DHCPPacket, dhcp.op)), /* A <- DHCP op */ |
49 | BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, BOOTREPLY, 1, 0), /* op == BOOTREPLY ? */ | |
50 | BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */ | |
51 | BPF_STMT(BPF_LD + BPF_B + BPF_ABS, offsetof(DHCPPacket, dhcp.htype)), /* A <- DHCP header type */ | |
52 | BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ARPHRD_ETHER, 1, 0), /* header type == ARPHRD_ETHER ? */ | |
53 | BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */ | |
54 | BPF_STMT(BPF_LD + BPF_B + BPF_ABS, offsetof(DHCPPacket, dhcp.hlen)), /* A <- mac address length */ | |
55 | BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ETHER_ADDR_LEN, 1, 0), /* address length == ETHER_ADDR_LEN ? */ | |
56 | BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */ | |
57 | BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(DHCPPacket, dhcp.xid)), /* A <- client identifier */ | |
58 | BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, xid, 1, 0), /* client identifier == xid ? */ | |
59 | BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */ | |
60 | /* TODO: match chaddr */ | |
61 | BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(DHCPPacket, dhcp.magic)), /* A <- DHCP magic cookie */ | |
62 | BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, DHCP_MAGIC_COOKIE, 1, 0), /* cookie == DHCP magic cookie ? */ | |
63 | BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */ | |
bc29e507 TG |
64 | BPF_STMT(BPF_RET + BPF_K, 65535), /* return all */ |
65 | }; | |
66 | struct sock_fprog fprog = { | |
67 | .len = ELEMENTSOF(filter), | |
68 | .filter = filter | |
69 | }; | |
c3d2994b TG |
70 | _cleanup_close_ int s = -1; |
71 | int r, one = 1; | |
8b4a9693 | 72 | |
23f30ed3 TG |
73 | assert(index > 0); |
74 | assert(link); | |
75 | ||
66a67eff | 76 | s = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0); |
8b4a9693 PF |
77 | if (s < 0) |
78 | return -errno; | |
79 | ||
c3d2994b TG |
80 | r = setsockopt (s, SOL_PACKET, PACKET_AUXDATA, &one, sizeof(one)); |
81 | if (r < 0) | |
82 | return -errno; | |
83 | ||
84 | r = setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER, &fprog, sizeof(fprog)); | |
85 | if (r < 0) | |
86 | return -errno; | |
87 | ||
8c00042c PF |
88 | link->ll.sll_family = AF_PACKET; |
89 | link->ll.sll_protocol = htons(ETH_P_IP); | |
90 | link->ll.sll_ifindex = index; | |
91 | link->ll.sll_halen = ETH_ALEN; | |
92 | memset(link->ll.sll_addr, 0xff, ETH_ALEN); | |
8b4a9693 | 93 | |
c3d2994b TG |
94 | r = bind(s, &link->sa, sizeof(link->ll)); |
95 | if (r < 0) | |
bc29e507 | 96 | return -errno; |
bc29e507 | 97 | |
c3d2994b TG |
98 | r = s; |
99 | s = -1; | |
8b4a9693 | 100 | |
c3d2994b | 101 | return r; |
8c00042c PF |
102 | } |
103 | ||
c3d2994b | 104 | int dhcp_network_bind_udp_socket(be32_t address, uint16_t port) { |
234fc2df PF |
105 | union sockaddr_union src = { |
106 | .in.sin_family = AF_INET, | |
080ab276 TG |
107 | .in.sin_port = htobe16(port), |
108 | .in.sin_addr.s_addr = address, | |
234fc2df | 109 | }; |
c3d2994b TG |
110 | _cleanup_close_ int s = -1; |
111 | int r, tos = IPTOS_CLASS_CS6; | |
234fc2df PF |
112 | |
113 | s = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0); | |
114 | if (s < 0) | |
115 | return -errno; | |
116 | ||
c3d2994b TG |
117 | r = setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)); |
118 | if (r < 0) | |
85923f79 TG |
119 | return -errno; |
120 | ||
c3d2994b TG |
121 | r = bind(s, &src.sa, sizeof(src.in)); |
122 | if (r < 0) | |
234fc2df | 123 | return -errno; |
234fc2df | 124 | |
c3d2994b TG |
125 | r = s; |
126 | s = -1; | |
127 | ||
128 | return r; | |
234fc2df PF |
129 | } |
130 | ||
8c00042c | 131 | int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link, |
c3d2994b TG |
132 | const void *packet, size_t len) { |
133 | int r; | |
134 | ||
23f30ed3 TG |
135 | assert(link); |
136 | assert(packet); | |
137 | assert(len); | |
138 | ||
c3d2994b TG |
139 | r = sendto(s, packet, len, 0, &link->sa, sizeof(link->ll)); |
140 | if (r < 0) | |
1c8035a8 | 141 | return -errno; |
8b4a9693 | 142 | |
1c8035a8 | 143 | return 0; |
8b4a9693 | 144 | } |
234fc2df | 145 | |
080ab276 | 146 | int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port, |
c3d2994b | 147 | const void *packet, size_t len) { |
234fc2df PF |
148 | union sockaddr_union dest = { |
149 | .in.sin_family = AF_INET, | |
080ab276 TG |
150 | .in.sin_port = htobe16(port), |
151 | .in.sin_addr.s_addr = address, | |
234fc2df | 152 | }; |
c3d2994b TG |
153 | int r; |
154 | ||
155 | assert(s >= 0); | |
156 | assert(packet); | |
157 | assert(len); | |
234fc2df | 158 | |
c3d2994b TG |
159 | r = sendto(s, packet, len, 0, &dest.sa, sizeof(dest.in)); |
160 | if (r < 0) | |
234fc2df PF |
161 | return -errno; |
162 | ||
163 | return 0; | |
164 | } |