124 lines
2.6 KiB
C
124 lines
2.6 KiB
C
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/*
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* WPA Supplicant - Layer2 packet handling example with dummy functions
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* Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*
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* This file can be used as a starting point for layer2 packet implementation.
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*/
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#include "includes.h"
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#include "common.h"
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#include "eloop.h"
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#include "l2_packet.h"
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struct l2_packet_data {
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char ifname[17];
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u8 own_addr[ETH_ALEN];
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void (*rx_callback)(void *ctx, const u8 *src_addr,
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const u8 *buf, size_t len);
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void *rx_callback_ctx;
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int l2_hdr; /* whether to include layer 2 (Ethernet) header data
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* buffers */
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int fd;
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};
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int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr)
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{
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os_memcpy(addr, l2->own_addr, ETH_ALEN);
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return 0;
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}
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int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto,
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const u8 *buf, size_t len)
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{
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if (l2 == NULL)
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return -1;
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/*
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* TODO: Send frame (may need different implementation depending on
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* whether l2->l2_hdr is set).
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*/
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return 0;
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}
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static void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx)
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{
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struct l2_packet_data *l2 = eloop_ctx;
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u8 buf[2300];
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int res;
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/* TODO: receive frame (e.g., recv() using sock */
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buf[0] = 0;
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res = 0;
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l2->rx_callback(l2->rx_callback_ctx, NULL /* TODO: src addr */,
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buf, res);
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}
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struct l2_packet_data * l2_packet_init(
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const char *ifname, const u8 *own_addr, unsigned short protocol,
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void (*rx_callback)(void *ctx, const u8 *src_addr,
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const u8 *buf, size_t len),
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void *rx_callback_ctx, int l2_hdr)
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{
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struct l2_packet_data *l2;
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l2 = os_zalloc(sizeof(struct l2_packet_data));
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if (l2 == NULL)
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return NULL;
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os_strlcpy(l2->ifname, ifname, sizeof(l2->ifname));
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l2->rx_callback = rx_callback;
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l2->rx_callback_ctx = rx_callback_ctx;
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l2->l2_hdr = l2_hdr;
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/*
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* TODO: open connection for receiving frames
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*/
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l2->fd = -1;
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eloop_register_read_sock(l2->fd, l2_packet_receive, l2, NULL);
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return l2;
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}
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void l2_packet_deinit(struct l2_packet_data *l2)
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{
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if (l2 == NULL)
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return;
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if (l2->fd >= 0) {
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eloop_unregister_read_sock(l2->fd);
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/* TODO: close connection */
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}
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os_free(l2);
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}
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int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len)
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{
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/* TODO: get interface IP address */
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return -1;
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}
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void l2_packet_notify_auth_start(struct l2_packet_data *l2)
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{
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/* This function can be left empty */
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}
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