Home | History | Annotate | Download | only in wpa_supplicant 
      1 /*
      2  * WPA Supplicant - Layer2 packet handling example with dummy functions
      3  * Copyright (c) 2003-2005, Jouni Malinen <j (at) 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 
     24 struct 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 
     36 int 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 
     43 int 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 
     58 static 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 
     73 struct 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_strncpy(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 
     99 void 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 
    113 int 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 
    120 void l2_packet_notify_auth_start(struct l2_packet_data *l2)
    121 {
    122 	/* This function can be left empty */
    123 }
    124