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