1 /* $OpenBSD: llc.c,v 1.7 2019/05/10 01:29:31 guenther Exp $ */
2
3 /*
4 * Copyright (c) 2004, 2005 Reyk Floeter <reyk@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <sys/ioctl.h>
20 #include <sys/types.h>
21 #include <sys/socket.h>
22 #include <sys/time.h>
23
24 #include <net/if.h>
25 #include <net/if_media.h>
26 #include <net/if_arp.h>
27 #include <net/if_llc.h>
28 #include <net/bpf.h>
29
30 #include <netinet/in.h>
31 #include <netinet/if_ether.h>
32 #include <arpa/inet.h>
33
34 #include <fcntl.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <unistd.h>
39 #include <limits.h>
40
41 #include "hostapd.h"
42
43 void
hostapd_llc_init(struct hostapd_config * cfg)44 hostapd_llc_init(struct hostapd_config *cfg)
45 {
46 struct hostapd_iapp *iapp = &cfg->c_iapp;
47 struct ifreq ifr;
48 u_int i;
49
50 iapp->i_raw = hostapd_bpf_open(O_WRONLY);
51 cfg->c_flags |= HOSTAPD_CFG_F_RAW;
52
53 bzero(&ifr, sizeof(struct ifreq));
54 (void)strlcpy(ifr.ifr_name, iapp->i_iface, sizeof(ifr.ifr_name));
55
56 /* Associate the wired network interface to the BPF descriptor */
57 if (ioctl(iapp->i_raw, BIOCSETIF, &ifr) == -1)
58 hostapd_fatal("failed to set BPF interface \"%s\": %s\n",
59 iapp->i_iface, strerror(errno));
60
61 i = 1;
62 if (ioctl(iapp->i_raw, BIOCSHDRCMPLT, &i) == -1)
63 hostapd_fatal("failed to set BPF header completion: %s\n",
64 strerror(errno));
65
66 /* Lock the BPF descriptor, no further configuration */
67 if (ioctl(iapp->i_raw, BIOCLOCK, NULL) == -1)
68 hostapd_fatal("failed to lock BPF interface on \"%s\": %s\n",
69 iapp->i_iface, strerror(errno));
70 }
71
72 int
hostapd_llc_send_xid(struct hostapd_config * cfg,struct hostapd_node * node)73 hostapd_llc_send_xid(struct hostapd_config *cfg, struct hostapd_node *node)
74 {
75 struct hostapd_iapp *iapp = &cfg->c_iapp;
76 struct hostapd_llc *llc;
77 u_int8_t buf[ETHER_HDR_LEN + (LLC_UFRAMELEN * 2)];
78
79 /*
80 * Send an IEEE 802.3 LLC XID frame which will possibly force
81 * our switch port on the wired network to learn the station's
82 * new MAC address.
83 */
84 bzero(&buf, sizeof(buf));
85 llc = (struct hostapd_llc *)&buf;
86 memset(&llc->x_hdr.ether_dhost, 0xff,
87 sizeof(llc->x_hdr.ether_dhost));
88 bcopy(&node->ni_macaddr, &llc->x_hdr.ether_shost,
89 sizeof(llc->x_hdr.ether_shost));
90 llc->x_hdr.ether_type = htons(sizeof(buf));
91 llc->x_llc.llc_control = IAPP_LLC;
92 llc->x_llc.llc_fid = IAPP_LLC_XID;
93 llc->x_llc.llc_class = IAPP_LLC_CLASS;
94 llc->x_llc.llc_window = IAPP_LLC_WINDOW;
95
96 if (write(iapp->i_raw, &buf, sizeof(buf)) == -1)
97 return (errno);
98 return (0);
99 }
100