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 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         if (l2->fd >= 0)
  88                 eloop_register_read_sock(l2->fd, l2_packet_receive, l2, NULL);
  89
  90         return l2;
  91 }
  92
  93
  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
 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
 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
 127 void l2_packet_notify_auth_start(struct l2_packet_data *l2)
 128 {
 129         /* This function can be left empty */
 130 }
 131
 132
 133 int l2_packet_set_packet_filter(struct l2_packet_data *l2,
 134                                 enum l2_packet_filter_type type)
 135 {
 136         return -1;
 137 }