1 /*
2 * WPA Supplicant - Layer2 packet handling example with stub 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
l2_packet_get_own_addr(struct l2_packet_data * l2,u8 * addr)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
l2_packet_send(struct l2_packet_data * l2,const u8 * dst_addr,u16 proto,const u8 * buf,size_t len)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
l2_packet_receive(int sock,void * eloop_ctx,void * sock_ctx)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
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)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 if (rx_callback && l2->fd >= 0)
88 eloop_register_read_sock(l2->fd, l2_packet_receive, l2, NULL);
89
90 return l2;
91 }
92
93
l2_packet_init_bridge(const char * br_ifname,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)94 struct l2_packet_data * l2_packet_init_bridge(
95 const char *br_ifname, const char *ifname, const u8 *own_addr,
96 unsigned short protocol,
97 void (*rx_callback)(void *ctx, const u8 *src_addr,
98 const u8 *buf, size_t len),
99 void *rx_callback_ctx, int l2_hdr)
100 {
101 return l2_packet_init(br_ifname, own_addr, protocol, rx_callback,
102 rx_callback_ctx, l2_hdr);
103 }
104
105
l2_packet_deinit(struct l2_packet_data * l2)106 void l2_packet_deinit(struct l2_packet_data *l2)
107 {
108 if (l2 == NULL)
109 return;
110
111 if (l2->fd >= 0) {
112 eloop_unregister_read_sock(l2->fd);
113 /* TODO: close connection */
114 }
115
116 os_free(l2);
117 }
118
119
l2_packet_get_ip_addr(struct l2_packet_data * l2,char * buf,size_t len)120 int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len)
121 {
122 /* TODO: get interface IP address */
123 return -1;
124 }
125
126
l2_packet_notify_auth_start(struct l2_packet_data * l2)127 void l2_packet_notify_auth_start(struct l2_packet_data *l2)
128 {
129 /* This function can be left empty */
130 }
131
132
l2_packet_set_packet_filter(struct l2_packet_data * l2,enum l2_packet_filter_type type)133 int l2_packet_set_packet_filter(struct l2_packet_data *l2,
134 enum l2_packet_filter_type type)
135 {
136 return -1;
137 }
138
