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/*
* WPA Supplicant - Layer2 packet handling with Linux packet sockets
* Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "includes.h"
#include <sys/ioctl.h>
#include <netpacket/packet.h>
#include <net/if.h>
#include "common.h"
#include "eloop.h"
#include "l2_packet.h"
struct l2_packet_data {
int fd; /* packet socket for EAPOL frames */
char ifname[IFNAMSIZ + 1];
int ifindex;
u8 own_addr[ETH_ALEN];
void (*rx_callback)(void *ctx, const u8 *src_addr,
const u8 *buf, size_t len);
void *rx_callback_ctx;
int l2_hdr; /* whether to include layer 2 (Ethernet) header data
* buffers */
};
int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr)
{
os_memcpy(addr, l2->own_addr, ETH_ALEN);
return 0;
}
int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto,
const u8 *buf, size_t len)
{
int ret;
if (l2 == NULL)
return -1;
if (l2->l2_hdr) {
ret = send(l2->fd, buf, len, 0);
if (ret < 0)
perror("l2_packet_send - send");
} else {
struct sockaddr_ll ll;
os_memset(&ll, 0, sizeof(ll));
ll.sll_family = AF_PACKET;
ll.sll_ifindex = l2->ifindex;
ll.sll_protocol = htons(proto);
ll.sll_halen = ETH_ALEN;
os_memcpy(ll.sll_addr, dst_addr, ETH_ALEN);
ret = sendto(l2->fd, buf, len, 0, (struct sockaddr *) &ll,
sizeof(ll));
if (ret < 0)
perror("l2_packet_send - sendto");
}
return ret;
}
static void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx)
{
struct l2_packet_data *l2 = eloop_ctx;
u8 buf[2300];
int res;
struct sockaddr_ll ll;
socklen_t fromlen;
os_memset(&ll, 0, sizeof(ll));
fromlen = sizeof(ll);
res = recvfrom(sock, buf, sizeof(buf), 0, (struct sockaddr *) &ll,
&fromlen);
if (res < 0) {
perror("l2_packet_receive - recvfrom");
return;
}
l2->rx_callback(l2->rx_callback_ctx, ll.sll_addr, buf, res);
}
struct l2_packet_data * 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)
{
struct l2_packet_data *l2;
struct ifreq ifr;
struct sockaddr_ll ll;
l2 = os_zalloc(sizeof(struct l2_packet_data));
if (l2 == NULL)
return NULL;
os_strncpy(l2->ifname, ifname, sizeof(l2->ifname));
l2->rx_callback = rx_callback;
l2->rx_callback_ctx = rx_callback_ctx;
l2->l2_hdr = l2_hdr;
l2->fd = socket(PF_PACKET, l2_hdr ? SOCK_RAW : SOCK_DGRAM,
htons(protocol));
if (l2->fd < 0) {
perror("socket(PF_PACKET)");
os_free(l2);
return NULL;
}
os_strncpy(ifr.ifr_name, l2->ifname, sizeof(ifr.ifr_name));
if (ioctl(l2->fd, SIOCGIFINDEX, &ifr) < 0) {
perror("ioctl[SIOCGIFINDEX]");
close(l2->fd);
os_free(l2);
return NULL;
}
l2->ifindex = ifr.ifr_ifindex;
os_memset(&ll, 0, sizeof(ll));
ll.sll_family = PF_PACKET;
ll.sll_ifindex = ifr.ifr_ifindex;
ll.sll_protocol = htons(protocol);
if (bind(l2->fd, (struct sockaddr *) &ll, sizeof(ll)) < 0) {
perror("bind[PF_PACKET]");
close(l2->fd);
os_free(l2);
return NULL;
}
if (ioctl(l2->fd, SIOCGIFHWADDR, &ifr) < 0) {
perror("ioctl[SIOCGIFHWADDR]");
close(l2->fd);
os_free(l2);
return NULL;
}
os_memcpy(l2->own_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
eloop_register_read_sock(l2->fd, l2_packet_receive, l2, NULL);
return l2;
}
void l2_packet_deinit(struct l2_packet_data *l2)
{
if (l2 == NULL)
return;
if (l2->fd >= 0) {
eloop_unregister_read_sock(l2->fd);
close(l2->fd);
}
os_free(l2);
}
int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len)
{
int s;
struct ifreq ifr;
struct sockaddr_in *saddr;
s = socket(PF_INET, SOCK_DGRAM, 0);
if (s < 0) {
perror("socket");
return -1;
}
os_memset(&ifr, 0, sizeof(ifr));
os_strncpy(ifr.ifr_name, l2->ifname, sizeof(ifr.ifr_name));
if (ioctl(s, SIOCGIFADDR, &ifr) < 0) {
if (errno != EADDRNOTAVAIL)
perror("ioctl[SIOCGIFADDR]");
close(s);
return -1;
}
close(s);
saddr = (struct sockaddr_in *) &ifr.ifr_addr;
if (saddr->sin_family != AF_INET)
return -1;
os_snprintf(buf, len, "%s", inet_ntoa(saddr->sin_addr));
return 0;
}
void l2_packet_notify_auth_start(struct l2_packet_data *l2)
{
}
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