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
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
l2_packet_get_own_addr(struct l2_packet_data * l2,u8 * addr)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
l2_packet_send(struct l2_packet_data * l2,const u8 * dst_addr,u16 proto,const u8 * buf,size_t len)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
l2_packet_receive(int sock,void * eloop_ctx,void * sock_ctx)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
l2_packet_init(const char * ifname,const u8 * own_addr,unsigned short protocol,void (* rx_callback)(void * ctx,const u8 * src_addr,const u8 * buf,size_t len),void * rx_callback_ctx,int l2_hdr)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
l2_packet_deinit(struct l2_packet_data * l2)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
l2_packet_get_ip_addr(struct l2_packet_data * l2,char * buf,size_t len)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
l2_packet_notify_auth_start(struct l2_packet_data * l2)120 void l2_packet_notify_auth_start(struct l2_packet_data *l2)
121 {
122 /* This function can be left empty */
123 }
124