src/l2_packet/l2_packet_none.c

   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
  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_strlcpy(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 }