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* WPA Supplicant - Layer2 packet handling with Linux packet sockets
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* Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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* Alternatively, this software may be distributed under the terms of BSD
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* See README and COPYING for more details.
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#include <sys/ioctl.h>
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#include <netpacket/packet.h>
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#include "l2_packet.h"
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struct l2_packet_data {
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int fd; /* packet socket for EAPOL frames */
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char ifname[IFNAMSIZ + 1];
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u8 own_addr[ETH_ALEN];
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void (*rx_callback)(void *ctx, const u8 *src_addr,
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const u8 *buf, size_t len);
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void *rx_callback_ctx;
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int l2_hdr; /* whether to include layer 2 (Ethernet) header data
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int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr)
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os_memcpy(addr, l2->own_addr, ETH_ALEN);
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int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto,
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const u8 *buf, size_t len)
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ret = send(l2->fd, buf, len, 0);
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perror("l2_packet_send - send");
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struct sockaddr_ll ll;
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os_memset(&ll, 0, sizeof(ll));
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ll.sll_family = AF_PACKET;
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ll.sll_ifindex = l2->ifindex;
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ll.sll_protocol = htons(proto);
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ll.sll_halen = ETH_ALEN;
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os_memcpy(ll.sll_addr, dst_addr, ETH_ALEN);
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ret = sendto(l2->fd, buf, len, 0, (struct sockaddr *) &ll,
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perror("l2_packet_send - sendto");
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static void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx)
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struct l2_packet_data *l2 = eloop_ctx;
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struct sockaddr_ll ll;
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os_memset(&ll, 0, sizeof(ll));
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res = recvfrom(sock, buf, sizeof(buf), 0, (struct sockaddr *) &ll,
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perror("l2_packet_receive - recvfrom");
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l2->rx_callback(l2->rx_callback_ctx, ll.sll_addr, buf, res);
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struct l2_packet_data * l2_packet_init(
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const char *ifname, const u8 *own_addr, unsigned short protocol,
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void (*rx_callback)(void *ctx, const u8 *src_addr,
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const u8 *buf, size_t len),
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void *rx_callback_ctx, int l2_hdr)
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struct l2_packet_data *l2;
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struct sockaddr_ll ll;
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l2 = os_zalloc(sizeof(struct l2_packet_data));
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os_strlcpy(l2->ifname, ifname, sizeof(l2->ifname));
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l2->rx_callback = rx_callback;
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l2->rx_callback_ctx = rx_callback_ctx;
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l2->fd = socket(PF_PACKET, l2_hdr ? SOCK_RAW : SOCK_DGRAM,
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perror("socket(PF_PACKET)");
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os_strlcpy(ifr.ifr_name, l2->ifname, sizeof(ifr.ifr_name));
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if (ioctl(l2->fd, SIOCGIFINDEX, &ifr) < 0) {
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perror("ioctl[SIOCGIFINDEX]");
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l2->ifindex = ifr.ifr_ifindex;
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os_memset(&ll, 0, sizeof(ll));
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ll.sll_family = PF_PACKET;
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ll.sll_ifindex = ifr.ifr_ifindex;
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ll.sll_protocol = htons(protocol);
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if (bind(l2->fd, (struct sockaddr *) &ll, sizeof(ll)) < 0) {
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perror("bind[PF_PACKET]");
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if (ioctl(l2->fd, SIOCGIFHWADDR, &ifr) < 0) {
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perror("ioctl[SIOCGIFHWADDR]");
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os_memcpy(l2->own_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
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eloop_register_read_sock(l2->fd, l2_packet_receive, l2, NULL);
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void l2_packet_deinit(struct l2_packet_data *l2)
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eloop_unregister_read_sock(l2->fd);
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int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len)
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struct sockaddr_in *saddr;
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s = socket(PF_INET, SOCK_DGRAM, 0);
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os_memset(&ifr, 0, sizeof(ifr));
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os_strlcpy(ifr.ifr_name, l2->ifname, sizeof(ifr.ifr_name));
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if (ioctl(s, SIOCGIFADDR, &ifr) < 0) {
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perror("ioctl[SIOCGIFADDR]");
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saddr = (struct sockaddr_in *) &ifr.ifr_addr;
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if (saddr->sin_family != AF_INET)
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res = os_strlcpy(buf, inet_ntoa(saddr->sin_addr), len);
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void l2_packet_notify_auth_start(struct l2_packet_data *l2)