1 /*
2  * WPA Supplicant - Layer2 packet handling example with dummy functions
3  * Copyright (c) 2003-2005, Jouni Malinen <j@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