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https://github.com/systemd/systemd-stable.git
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236 lines
11 KiB
C
236 lines
11 KiB
C
/***
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This file is part of systemd.
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Copyright (C) 2013 Intel Corporation. All rights reserved.
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <net/ethernet.h>
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#include <net/if_arp.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <linux/filter.h>
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#include <linux/if_infiniband.h>
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#include <linux/if_packet.h>
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#include "dhcp-internal.h"
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#include "fd-util.h"
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#include "socket-util.h"
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static int _bind_raw_socket(int ifindex, union sockaddr_union *link,
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uint32_t xid, const uint8_t *mac_addr,
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size_t mac_addr_len,
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const uint8_t *bcast_addr,
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const struct ether_addr *eth_mac,
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uint16_t arp_type, uint8_t dhcp_hlen) {
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struct sock_filter filter[] = {
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BPF_STMT(BPF_LD + BPF_W + BPF_LEN, 0), /* A <- packet length */
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BPF_JUMP(BPF_JMP + BPF_JGE + BPF_K, sizeof(DHCPPacket), 1, 0), /* packet >= DHCPPacket ? */
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BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
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BPF_STMT(BPF_LD + BPF_B + BPF_ABS, offsetof(DHCPPacket, ip.protocol)), /* A <- IP protocol */
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BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_UDP, 1, 0), /* IP protocol == UDP ? */
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BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
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BPF_STMT(BPF_LD + BPF_B + BPF_ABS, offsetof(DHCPPacket, ip.frag_off)), /* A <- Flags */
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BPF_STMT(BPF_ALU + BPF_AND + BPF_K, 0x20), /* A <- A & 0x20 (More Fragments bit) */
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BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0, 1, 0), /* A == 0 ? */
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BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
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BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(DHCPPacket, ip.frag_off)), /* A <- Flags + Fragment offset */
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BPF_STMT(BPF_ALU + BPF_AND + BPF_K, 0x1fff), /* A <- A & 0x1fff (Fragment offset) */
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BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0, 1, 0), /* A == 0 ? */
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BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
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BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(DHCPPacket, udp.dest)), /* A <- UDP destination port */
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BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, DHCP_PORT_CLIENT, 1, 0), /* UDP destination port == DHCP client port ? */
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BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
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BPF_STMT(BPF_LD + BPF_B + BPF_ABS, offsetof(DHCPPacket, dhcp.op)), /* A <- DHCP op */
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BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, BOOTREPLY, 1, 0), /* op == BOOTREPLY ? */
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BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
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BPF_STMT(BPF_LD + BPF_B + BPF_ABS, offsetof(DHCPPacket, dhcp.htype)), /* A <- DHCP header type */
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BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, arp_type, 1, 0), /* header type == arp_type ? */
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BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
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BPF_STMT(BPF_LD + BPF_B + BPF_ABS, offsetof(DHCPPacket, dhcp.hlen)), /* A <- MAC address length */
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BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, dhcp_hlen, 1, 0), /* address length == dhcp_hlen ? */
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BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
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BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(DHCPPacket, dhcp.xid)), /* A <- client identifier */
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BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, xid, 1, 0), /* client identifier == xid ? */
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BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
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BPF_STMT(BPF_LD + BPF_IMM, htobe32(*((unsigned int *) eth_mac))), /* A <- 4 bytes of client's MAC */
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BPF_STMT(BPF_MISC + BPF_TAX, 0), /* X <- A */
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BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(DHCPPacket, dhcp.chaddr)), /* A <- 4 bytes of MAC from dhcp.chaddr */
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BPF_STMT(BPF_ALU + BPF_XOR + BPF_X, 0), /* A xor X */
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BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0, 1, 0), /* A == 0 ? */
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BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
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BPF_STMT(BPF_LD + BPF_IMM, htobe16(*((unsigned short *) (((char *) eth_mac) + 4)))), /* A <- remainder of client's MAC */
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BPF_STMT(BPF_MISC + BPF_TAX, 0), /* X <- A */
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BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(DHCPPacket, dhcp.chaddr) + 4), /* A <- remainder of MAC from dhcp.chaddr */
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BPF_STMT(BPF_ALU + BPF_XOR + BPF_X, 0), /* A xor X */
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BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0, 1, 0), /* A == 0 ? */
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BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
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BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(DHCPPacket, dhcp.magic)), /* A <- DHCP magic cookie */
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BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, DHCP_MAGIC_COOKIE, 1, 0), /* cookie == DHCP magic cookie ? */
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BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */
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BPF_STMT(BPF_RET + BPF_K, 65535), /* return all */
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};
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struct sock_fprog fprog = {
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.len = ELEMENTSOF(filter),
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.filter = filter
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};
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_cleanup_close_ int s = -1;
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int r, on = 1;
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assert(ifindex > 0);
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assert(link);
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s = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
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if (s < 0)
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return -errno;
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r = setsockopt(s, SOL_PACKET, PACKET_AUXDATA, &on, sizeof(on));
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if (r < 0)
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return -errno;
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r = setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER, &fprog, sizeof(fprog));
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if (r < 0)
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return -errno;
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link->ll.sll_family = AF_PACKET;
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link->ll.sll_protocol = htons(ETH_P_IP);
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link->ll.sll_ifindex = ifindex;
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link->ll.sll_hatype = htons(arp_type);
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link->ll.sll_halen = mac_addr_len;
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memcpy(link->ll.sll_addr, bcast_addr, mac_addr_len);
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r = bind(s, &link->sa, sizeof(link->ll));
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if (r < 0)
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return -errno;
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r = s;
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s = -1;
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return r;
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}
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int dhcp_network_bind_raw_socket(int ifindex, union sockaddr_union *link,
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uint32_t xid, const uint8_t *mac_addr,
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size_t mac_addr_len, uint16_t arp_type) {
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static const uint8_t eth_bcast[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
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/* Default broadcast address for IPoIB */
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static const uint8_t ib_bcast[] = {
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0x00, 0xff, 0xff, 0xff, 0xff, 0x12, 0x40, 0x1b,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0xff, 0xff, 0xff, 0xff
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};
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struct ether_addr eth_mac = { { 0, 0, 0, 0, 0, 0 } };
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const uint8_t *bcast_addr = NULL;
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uint8_t dhcp_hlen = 0;
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assert_return(mac_addr_len > 0, -EINVAL);
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if (arp_type == ARPHRD_ETHER) {
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assert_return(mac_addr_len == ETH_ALEN, -EINVAL);
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memcpy(ð_mac, mac_addr, ETH_ALEN);
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bcast_addr = eth_bcast;
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dhcp_hlen = ETH_ALEN;
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} else if (arp_type == ARPHRD_INFINIBAND) {
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assert_return(mac_addr_len == INFINIBAND_ALEN, -EINVAL);
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bcast_addr = ib_bcast;
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} else
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return -EINVAL;
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return _bind_raw_socket(ifindex, link, xid, mac_addr, mac_addr_len,
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bcast_addr, ð_mac, arp_type, dhcp_hlen);
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}
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int dhcp_network_bind_udp_socket(be32_t address, uint16_t port) {
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union sockaddr_union src = {
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.in.sin_family = AF_INET,
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.in.sin_port = htobe16(port),
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.in.sin_addr.s_addr = address,
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};
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_cleanup_close_ int s = -1;
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int r, on = 1, tos = IPTOS_CLASS_CS6;
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s = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
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if (s < 0)
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return -errno;
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r = setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(tos));
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if (r < 0)
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return -errno;
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r = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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if (r < 0)
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return -errno;
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if (address == INADDR_ANY) {
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r = setsockopt(s, IPPROTO_IP, IP_PKTINFO, &on, sizeof(on));
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if (r < 0)
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return -errno;
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r = setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on));
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if (r < 0)
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return -errno;
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} else {
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r = setsockopt(s, IPPROTO_IP, IP_FREEBIND, &on, sizeof(on));
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if (r < 0)
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return -errno;
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}
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r = bind(s, &src.sa, sizeof(src.in));
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if (r < 0)
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return -errno;
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r = s;
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s = -1;
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return r;
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}
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int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link,
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const void *packet, size_t len) {
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int r;
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assert(link);
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assert(packet);
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assert(len);
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r = sendto(s, packet, len, 0, &link->sa, sizeof(link->ll));
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if (r < 0)
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return -errno;
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return 0;
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}
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int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port,
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const void *packet, size_t len) {
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union sockaddr_union dest = {
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.in.sin_family = AF_INET,
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.in.sin_port = htobe16(port),
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.in.sin_addr.s_addr = address,
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};
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int r;
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assert(s >= 0);
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assert(packet);
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assert(len);
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r = sendto(s, packet, len, 0, &dest.sa, sizeof(dest.in));
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if (r < 0)
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return -errno;
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return 0;
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}
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