2 * WPA Supplicant - Layer2 packet handling with Linux packet sockets
3 * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
10 #include <sys/ioctl.h>
11 #include <netpacket/packet.h>
16 #include "l2_packet.h"
19 struct l2_packet_data {
20 int fd; /* packet socket for EAPOL frames */
21 char ifname[IFNAMSIZ + 1];
23 u8 own_addr[ETH_ALEN];
24 void (*rx_callback)(void *ctx, const u8 *src_addr,
25 const u8 *buf, size_t len);
26 void *rx_callback_ctx;
27 int l2_hdr; /* whether to include layer 2 (Ethernet) header data
32 int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr)
34 os_memcpy(addr, l2->own_addr, ETH_ALEN);
39 int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto,
40 const u8 *buf, size_t len)
46 ret = send(l2->fd, buf, len, 0);
48 wpa_printf(MSG_ERROR, "l2_packet_send - send: %s",
51 struct sockaddr_ll ll;
52 os_memset(&ll, 0, sizeof(ll));
53 ll.sll_family = AF_PACKET;
54 ll.sll_ifindex = l2->ifindex;
55 ll.sll_protocol = htons(proto);
56 ll.sll_halen = ETH_ALEN;
57 os_memcpy(ll.sll_addr, dst_addr, ETH_ALEN);
58 ret = sendto(l2->fd, buf, len, 0, (struct sockaddr *) &ll,
61 wpa_printf(MSG_ERROR, "l2_packet_send - sendto: %s",
69 static void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx)
71 struct l2_packet_data *l2 = eloop_ctx;
74 struct sockaddr_ll ll;
77 os_memset(&ll, 0, sizeof(ll));
79 res = recvfrom(sock, buf, sizeof(buf), 0, (struct sockaddr *) &ll,
82 wpa_printf(MSG_DEBUG, "l2_packet_receive - recvfrom: %s",
87 l2->rx_callback(l2->rx_callback_ctx, ll.sll_addr, buf, res);
91 struct l2_packet_data * l2_packet_init(
92 const char *ifname, const u8 *own_addr, unsigned short protocol,
93 void (*rx_callback)(void *ctx, const u8 *src_addr,
94 const u8 *buf, size_t len),
95 void *rx_callback_ctx, int l2_hdr)
97 struct l2_packet_data *l2;
99 struct sockaddr_ll ll;
101 l2 = os_zalloc(sizeof(struct l2_packet_data));
104 os_strlcpy(l2->ifname, ifname, sizeof(l2->ifname));
105 l2->rx_callback = rx_callback;
106 l2->rx_callback_ctx = rx_callback_ctx;
109 l2->fd = socket(PF_PACKET, l2_hdr ? SOCK_RAW : SOCK_DGRAM,
112 wpa_printf(MSG_ERROR, "%s: socket(PF_PACKET): %s",
113 __func__, strerror(errno));
117 os_memset(&ifr, 0, sizeof(ifr));
118 os_strlcpy(ifr.ifr_name, l2->ifname, sizeof(ifr.ifr_name));
119 if (ioctl(l2->fd, SIOCGIFINDEX, &ifr) < 0) {
120 wpa_printf(MSG_ERROR, "%s: ioctl[SIOCGIFINDEX]: %s",
121 __func__, strerror(errno));
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 wpa_printf(MSG_ERROR, "%s: bind[PF_PACKET]: %s",
134 __func__, strerror(errno));
140 if (ioctl(l2->fd, SIOCGIFHWADDR, &ifr) < 0) {
141 wpa_printf(MSG_ERROR, "%s: ioctl[SIOCGIFHWADDR]: %s",
142 __func__, strerror(errno));
147 os_memcpy(l2->own_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
149 eloop_register_read_sock(l2->fd, l2_packet_receive, l2, NULL);
155 void l2_packet_deinit(struct l2_packet_data *l2)
161 eloop_unregister_read_sock(l2->fd);
169 int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len)
173 struct sockaddr_in *saddr;
176 s = socket(PF_INET, SOCK_DGRAM, 0);
178 wpa_printf(MSG_ERROR, "%s: socket: %s",
179 __func__, strerror(errno));
182 os_memset(&ifr, 0, sizeof(ifr));
183 os_strlcpy(ifr.ifr_name, l2->ifname, sizeof(ifr.ifr_name));
184 if (ioctl(s, SIOCGIFADDR, &ifr) < 0) {
185 if (errno != EADDRNOTAVAIL)
186 wpa_printf(MSG_ERROR, "%s: ioctl[SIOCGIFADDR]: %s",
187 __func__, strerror(errno));
192 saddr = aliasing_hide_typecast(&ifr.ifr_addr, struct sockaddr_in);
193 if (saddr->sin_family != AF_INET)
195 res = os_strlcpy(buf, inet_ntoa(saddr->sin_addr), len);
202 void l2_packet_notify_auth_start(struct l2_packet_data *l2)