2 * WPA Supplicant - Layer2 packet handling with Linux packet sockets
3 * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
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.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
16 #include <sys/ioctl.h>
17 #include <netpacket/packet.h>
22 #include "l2_packet.h"
25 struct l2_packet_data {
26 int fd; /* packet socket for EAPOL frames */
27 char ifname[IFNAMSIZ + 1];
29 u8 own_addr[ETH_ALEN];
30 void (*rx_callback)(void *ctx, const u8 *src_addr,
31 const u8 *buf, size_t len);
32 void *rx_callback_ctx;
33 int l2_hdr; /* whether to include layer 2 (Ethernet) header data
38 int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr)
40 os_memcpy(addr, l2->own_addr, ETH_ALEN);
45 int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto,
46 const u8 *buf, size_t len)
52 ret = send(l2->fd, buf, len, 0);
54 perror("l2_packet_send - send");
56 struct sockaddr_ll ll;
57 os_memset(&ll, 0, sizeof(ll));
58 ll.sll_family = AF_PACKET;
59 ll.sll_ifindex = l2->ifindex;
60 ll.sll_protocol = htons(proto);
61 ll.sll_halen = ETH_ALEN;
62 os_memcpy(ll.sll_addr, dst_addr, ETH_ALEN);
63 ret = sendto(l2->fd, buf, len, 0, (struct sockaddr *) &ll,
66 perror("l2_packet_send - sendto");
72 static void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx)
74 struct l2_packet_data *l2 = eloop_ctx;
77 struct sockaddr_ll ll;
80 os_memset(&ll, 0, sizeof(ll));
82 res = recvfrom(sock, buf, sizeof(buf), 0, (struct sockaddr *) &ll,
85 perror("l2_packet_receive - recvfrom");
89 l2->rx_callback(l2->rx_callback_ctx, ll.sll_addr, buf, res);
93 struct l2_packet_data * l2_packet_init(
94 const char *ifname, const u8 *own_addr, unsigned short protocol,
95 void (*rx_callback)(void *ctx, const u8 *src_addr,
96 const u8 *buf, size_t len),
97 void *rx_callback_ctx, int l2_hdr)
99 struct l2_packet_data *l2;
101 struct sockaddr_ll ll;
103 l2 = os_zalloc(sizeof(struct l2_packet_data));
106 os_strlcpy(l2->ifname, ifname, sizeof(l2->ifname));
107 l2->rx_callback = rx_callback;
108 l2->rx_callback_ctx = rx_callback_ctx;
111 l2->fd = socket(PF_PACKET, l2_hdr ? SOCK_RAW : SOCK_DGRAM,
114 perror("socket(PF_PACKET)");
118 os_memset(&ifr, 0, sizeof(ifr));
119 os_strlcpy(ifr.ifr_name, l2->ifname, sizeof(ifr.ifr_name));
120 if (ioctl(l2->fd, SIOCGIFINDEX, &ifr) < 0) {
121 perror("ioctl[SIOCGIFINDEX]");
126 l2->ifindex = ifr.ifr_ifindex;
128 os_memset(&ll, 0, sizeof(ll));
129 ll.sll_family = PF_PACKET;
130 ll.sll_ifindex = ifr.ifr_ifindex;
131 ll.sll_protocol = htons(protocol);
132 if (bind(l2->fd, (struct sockaddr *) &ll, sizeof(ll)) < 0) {
133 perror("bind[PF_PACKET]");
139 if (ioctl(l2->fd, SIOCGIFHWADDR, &ifr) < 0) {
140 perror("ioctl[SIOCGIFHWADDR]");
145 os_memcpy(l2->own_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
147 eloop_register_read_sock(l2->fd, l2_packet_receive, l2, NULL);
153 void l2_packet_deinit(struct l2_packet_data *l2)
159 eloop_unregister_read_sock(l2->fd);
167 int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len)
171 struct sockaddr_in *saddr;
174 s = socket(PF_INET, SOCK_DGRAM, 0);
179 os_memset(&ifr, 0, sizeof(ifr));
180 os_strlcpy(ifr.ifr_name, l2->ifname, sizeof(ifr.ifr_name));
181 if (ioctl(s, SIOCGIFADDR, &ifr) < 0) {
182 if (errno != EADDRNOTAVAIL)
183 perror("ioctl[SIOCGIFADDR]");
188 saddr = aliasing_hide_typecast(&ifr.ifr_addr, struct sockaddr_in);
189 if (saddr->sin_family != AF_INET)
191 res = os_strlcpy(buf, inet_ntoa(saddr->sin_addr), len);
198 void l2_packet_notify_auth_start(struct l2_packet_data *l2)