1/* 2 * WPA Supplicant - Layer2 packet handling example with dummy functions 3 * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Alternatively, this software may be distributed under the terms of BSD 10 * license. 11 * 12 * See README and COPYING for more details. 13 * 14 * This file can be used as a starting point for layer2 packet implementation. 15 */ 16 17#include "includes.h" 18 19#include "common.h" 20#include "eloop.h" 21#include "l2_packet.h" 22 23 24struct l2_packet_data { 25 char ifname[17]; 26 u8 own_addr[ETH_ALEN]; 27 void (*rx_callback)(void *ctx, const u8 *src_addr, 28 const u8 *buf, size_t len); 29 void *rx_callback_ctx; 30 int l2_hdr; /* whether to include layer 2 (Ethernet) header data 31 * buffers */ 32 int fd; 33}; 34 35 36int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr) 37{ 38 os_memcpy(addr, l2->own_addr, ETH_ALEN); 39 return 0; 40} 41 42 43int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto, 44 const u8 *buf, size_t len) 45{ 46 if (l2 == NULL) 47 return -1; 48 49 /* 50 * TODO: Send frame (may need different implementation depending on 51 * whether l2->l2_hdr is set). 52 */ 53 54 return 0; 55} 56 57 58static void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx) 59{ 60 struct l2_packet_data *l2 = eloop_ctx; 61 u8 buf[2300]; 62 int res; 63 64 /* TODO: receive frame (e.g., recv() using sock */ 65 buf[0] = 0; 66 res = 0; 67 68 l2->rx_callback(l2->rx_callback_ctx, NULL /* TODO: src addr */, 69 buf, res); 70} 71 72 73struct l2_packet_data * l2_packet_init( 74 const char *ifname, const u8 *own_addr, unsigned short protocol, 75 void (*rx_callback)(void *ctx, const u8 *src_addr, 76 const u8 *buf, size_t len), 77 void *rx_callback_ctx, int l2_hdr) 78{ 79 struct l2_packet_data *l2; 80 81 l2 = os_zalloc(sizeof(struct l2_packet_data)); 82 if (l2 == NULL) 83 return NULL; 84 os_strlcpy(l2->ifname, ifname, sizeof(l2->ifname)); 85 l2->rx_callback = rx_callback; 86 l2->rx_callback_ctx = rx_callback_ctx; 87 l2->l2_hdr = l2_hdr; 88 89 /* 90 * TODO: open connection for receiving frames 91 */ 92 l2->fd = -1; 93 eloop_register_read_sock(l2->fd, l2_packet_receive, l2, NULL); 94 95 return l2; 96} 97 98 99void l2_packet_deinit(struct l2_packet_data *l2) 100{ 101 if (l2 == NULL) 102 return; 103 104 if (l2->fd >= 0) { 105 eloop_unregister_read_sock(l2->fd); 106 /* TODO: close connection */ 107 } 108 109 os_free(l2); 110} 111 112 113int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len) 114{ 115 /* TODO: get interface IP address */ 116 return -1; 117} 118 119 120void l2_packet_notify_auth_start(struct l2_packet_data *l2) 121{ 122 /* This function can be left empty */ 123} 124