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/***
This file is part of systemd.
Copyright (C) 2013 Intel Corporation. All rights reserved.
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <linux/if_packet.h>
#include <net/ethernet.h>
#include <stdio.h>
#include <unistd.h>
#include <linux/filter.h>
#include "socket-util.h"
#include "dhcp-internal.h"
int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link)
{
struct sock_filter filter[] = {
BPF_STMT(BPF_LD + BPF_B + BPF_ABS, offsetof(DHCPPacket, ip.protocol)), /* A <- IP protocol */
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_UDP, 1, 0), /* IP protocol = UDP? */
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? */
BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
BPF_STMT(BPF_RET + BPF_K, 65535), /* return all */
};
struct sock_fprog fprog = {
.len = ELEMENTSOF(filter),
.filter = filter
};
int s, one = 1;
assert(index > 0);
assert(link);
s = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
if (s < 0)
return -errno;
link->ll.sll_family = AF_PACKET;
link->ll.sll_protocol = htons(ETH_P_IP);
link->ll.sll_ifindex = index;
link->ll.sll_halen = ETH_ALEN;
memset(link->ll.sll_addr, 0xff, ETH_ALEN);
if (setsockopt (s, SOL_PACKET, PACKET_AUXDATA, &one, sizeof(one)) < 0)
return -errno;
if (setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER, &fprog, sizeof(fprog)) < 0) {
return -errno;
}
if (bind(s, &link->sa, sizeof(link->ll)) < 0) {
safe_close(s);
return -errno;
}
return s;
}
int dhcp_network_bind_udp_socket(int index, be32_t address, uint16_t port)
{
int s;
union sockaddr_union src = {
.in.sin_family = AF_INET,
.in.sin_port = htobe16(port),
.in.sin_addr.s_addr = address,
};
s = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
if (s < 0)
return -errno;
if (bind(s, &src.sa, sizeof(src.in)) < 0) {
safe_close(s);
return -errno;
}
return s;
}
int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link,
const void *packet, size_t len)
{
assert(link);
assert(packet);
assert(len);
if (sendto(s, packet, len, 0, &link->sa, sizeof(link->ll)) < 0)
return -errno;
return 0;
}
int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port,
const void *packet, size_t len)
{
union sockaddr_union dest = {
.in.sin_family = AF_INET,
.in.sin_port = htobe16(port),
.in.sin_addr.s_addr = address,
};
if (sendto(s, packet, len, 0, &dest.sa, sizeof(dest.in)) < 0)
return -errno;
return 0;
}
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