forked from osmocom/wireshark
2a2ddb7bcb
Add libnl version 1 support for wireless toolbar. svn path=/trunk/; revision=43462
675 lines
15 KiB
C
675 lines
15 KiB
C
/*
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* ws80211 utilities
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* Copyright 2012, Pontus Fuchs <pontus.fuchs@gmail.com>
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$Id$
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Parts of this file was copied from iw:
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Copyright (c) 2007, 2008 Johannes Berg
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Copyright (c) 2007 Andy Lutomirski
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Copyright (c) 2007 Mike Kershaw
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Copyright (c) 2008-2009 Luis R. Rodriguez
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <glib.h>
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#include <glib/gstdio.h>
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#include "ws80211_utils.h"
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#ifdef HAVE_LIBNL
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#include <strings.h>
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#include <errno.h>
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#include <unistd.h>
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#include <net/if.h>
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#include <sys/ioctl.h>
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#include <netlink/genl/genl.h>
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#include <netlink/genl/family.h>
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#include <netlink/genl/ctrl.h>
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#include <netlink/msg.h>
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#include <netlink/attr.h>
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/* libnl 1.x compatibility code */
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#ifdef HAVE_LIBNL1
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#define nl_sock nl_handle
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static inline struct nl_handle *nl_socket_alloc(void)
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{
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return nl_handle_alloc();
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}
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static inline void nl_socket_free(struct nl_sock *h)
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{
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nl_handle_destroy(h);
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}
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#endif /* HAVE_LIBNL1 */
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struct nl80211_state {
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struct nl_sock *nl_sock;
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int nl80211_id;
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};
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static struct nl80211_state nl_state;
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int ws80211_init(void)
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{
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int err;
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struct nl80211_state *state = &nl_state;
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state->nl_sock = nl_socket_alloc();
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if (!state->nl_sock) {
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fprintf(stderr, "Failed to allocate netlink socket.\n");
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return -ENOMEM;
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}
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if (genl_connect(state->nl_sock)) {
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fprintf(stderr, "Failed to connect to generic netlink.\n");
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err = -ENOLINK;
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goto out_handle_destroy;
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}
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state->nl80211_id = genl_ctrl_resolve(state->nl_sock, "nl80211");
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if (state->nl80211_id < 0) {
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fprintf(stderr, "nl80211 not found.\n");
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err = -ENOENT;
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goto out_handle_destroy;
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}
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return 0;
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out_handle_destroy:
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nl_socket_free(state->nl_sock);
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state->nl_sock = 0;
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return err;
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}
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static int error_handler(struct sockaddr_nl *nla _U_, struct nlmsgerr *err,
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void *arg)
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{
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int *ret = arg;
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*ret = err->error;
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return NL_STOP;
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}
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static int finish_handler(struct nl_msg *msg _U_, void *arg)
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{
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int *ret = arg;
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*ret = 0;
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return NL_SKIP;
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}
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static int ack_handler(struct nl_msg *msg _U_, void *arg)
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{
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int *ret = arg;
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*ret = 0;
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return NL_STOP;
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}
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static int nl80211_do_cmd(struct nl_msg *msg, struct nl_cb *cb)
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{
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int err;
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if (!nl_state.nl_sock)
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return -ENOLINK;
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err = nl_send_auto_complete(nl_state.nl_sock, msg);
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if (err < 0)
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goto out;
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err = 1;
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nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &err);
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nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, finish_handler, &err);
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nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &err);
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while (err > 0)
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nl_recvmsgs(nl_state.nl_sock, cb);
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out:
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nl_cb_put(cb);
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return err;
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}
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struct nliface_cookie
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{
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char *ifname;
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GArray *interfaces;
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};
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static int get_phys_handler(struct nl_msg *msg, void *arg)
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{
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struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];
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struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
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struct nliface_cookie *cookie = arg;
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struct nlattr *tb_band[NL80211_BAND_ATTR_MAX + 1];
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struct nlattr *tb_freq[NL80211_FREQUENCY_ATTR_MAX + 1];
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static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
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[NL80211_FREQUENCY_ATTR_FREQ] = { .type = NLA_U32 },
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[NL80211_FREQUENCY_ATTR_DISABLED] = { .type = NLA_FLAG },
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[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
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[NL80211_FREQUENCY_ATTR_NO_IBSS] = { .type = NLA_FLAG },
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[NL80211_FREQUENCY_ATTR_RADAR] = { .type = NLA_FLAG },
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[NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32 },
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};
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struct nlattr *nl_band;
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struct nlattr *nl_freq;
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struct nlattr *nl_cmd;
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struct nlattr *nl_mode;
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int bandidx = 1;
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int rem_band, rem_freq, rem_mode;
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struct ws80211_interface *iface;
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int cap_monitor = 0;
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nla_parse(tb_msg, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
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genlmsg_attrlen(gnlh, 0), NULL);
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if (!tb_msg[NL80211_ATTR_WIPHY_BANDS])
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return NL_SKIP;
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if (tb_msg[NL80211_ATTR_SUPPORTED_IFTYPES]) {
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nla_for_each_nested(nl_mode, tb_msg[NL80211_ATTR_SUPPORTED_IFTYPES], rem_mode) {
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if (nla_type(nl_mode) == NL80211_IFTYPE_MONITOR)
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cap_monitor = 1;
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}
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}
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if (!cap_monitor)
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return NL_SKIP;
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iface = g_malloc0(sizeof(*iface));
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if (!iface)
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return NL_SKIP;
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iface->frequencies = g_array_new(FALSE, FALSE, sizeof(int));
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iface->channel_types = 1 << NL80211_CHAN_NO_HT;
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if (tb_msg[NL80211_ATTR_WIPHY_NAME]) {
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char *phyname;
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phyname = g_strdup(nla_get_string(tb_msg[NL80211_ATTR_WIPHY_NAME]));
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iface->ifname = g_strdup_printf("%s.mon", phyname);
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}
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nla_for_each_nested(nl_band, tb_msg[NL80211_ATTR_WIPHY_BANDS], rem_band) {
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bandidx++;
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nla_parse(tb_band, NL80211_BAND_ATTR_MAX, nla_data(nl_band),
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nla_len(nl_band), NULL);
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if (tb_band[NL80211_BAND_ATTR_HT_CAPA]) {
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gboolean ht40;
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iface->channel_types |= 1 << NL80211_CHAN_HT20;
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ht40 = !!(nla_get_u16(tb_band[NL80211_BAND_ATTR_HT_CAPA]) & 0x02);
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if (ht40) {
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iface->channel_types |= 1 << NL80211_CHAN_HT40MINUS;
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iface->channel_types |= 1 << NL80211_CHAN_HT40PLUS;
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}
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}
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nla_for_each_nested(nl_freq, tb_band[NL80211_BAND_ATTR_FREQS], rem_freq) {
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uint32_t freq;
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nla_parse(tb_freq, NL80211_FREQUENCY_ATTR_MAX, nla_data(nl_freq),
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nla_len(nl_freq), freq_policy);
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if (!tb_freq[NL80211_FREQUENCY_ATTR_FREQ])
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continue;
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if (tb_freq[NL80211_FREQUENCY_ATTR_DISABLED])
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continue;
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freq = nla_get_u32(tb_freq[NL80211_FREQUENCY_ATTR_FREQ]);
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g_array_append_val(iface->frequencies, freq);
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}
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}
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/* Can frequency be set? */
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if (tb_msg[NL80211_ATTR_SUPPORTED_COMMANDS]) {
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int cmd;
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nla_for_each_nested(nl_cmd, tb_msg[NL80211_ATTR_SUPPORTED_COMMANDS], cmd) {
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if(nla_get_u32(nl_cmd) == NL80211_CMD_SET_CHANNEL)
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iface->can_set_freq = TRUE;
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}
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}
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g_array_append_val(cookie->interfaces, iface);
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return NL_SKIP;
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}
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static int ws80211_get_phys(GArray *interfaces)
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{
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struct nliface_cookie cookie;
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struct nl_msg *msg;
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struct nl_cb *cb;
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msg = nlmsg_alloc();
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if (!msg) {
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fprintf(stderr, "failed to allocate netlink message\n");
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return 2;
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}
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cb = nl_cb_alloc(NL_CB_DEFAULT);
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cookie.interfaces = interfaces;
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genlmsg_put(msg, 0, 0, nl_state.nl80211_id, 0,
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NLM_F_DUMP, NL80211_CMD_GET_WIPHY, 0);
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nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, get_phys_handler, &cookie);
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return nl80211_do_cmd(msg, cb);
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}
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static int get_freq_wext(const char *ifname)
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{
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int fd;
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int ret = -1;
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/* Ugly hack to avoid incuding wireless.h */
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struct {
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char name1[IFNAMSIZ];
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__s32 m;
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__s16 e;
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__u8 i;
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__u8 flags;
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} wrq;
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fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (fd == -1)
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return -1;
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g_strlcpy(wrq.name1, ifname, IFNAMSIZ);
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/* SIOCGIWFREQ */
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if (ioctl(fd, 0x8B05, &wrq) == 0) {
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if (wrq.e == 6)
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ret = wrq.m;
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}
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close(fd);
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return ret;
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}
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struct __iface_info
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{
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struct ws80211_iface_info *pub;
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int type;
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int phyidx;
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};
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static int get_iface_info_handler(struct nl_msg *msg, void *arg)
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{
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struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
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struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];
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struct __iface_info *iface_info = arg;
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nla_parse(tb_msg, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
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genlmsg_attrlen(gnlh, 0), NULL);
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if (tb_msg[NL80211_ATTR_IFTYPE]) {
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iface_info->type = nla_get_u32(tb_msg[NL80211_ATTR_IFTYPE]);
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}
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if (tb_msg[NL80211_ATTR_WIPHY]) {
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iface_info->phyidx = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY]);
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}
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if (tb_msg[NL80211_ATTR_WIPHY_FREQ]) {
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iface_info->pub->current_freq = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY_FREQ]);
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iface_info->pub->current_chan_type = NL80211_CHAN_NO_HT;
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if (tb_msg[NL80211_ATTR_WIPHY_CHANNEL_TYPE])
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iface_info->pub->current_chan_type = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
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}
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return NL_SKIP;
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}
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static int __ws80211_get_iface_info(const char *name, struct __iface_info *iface_info)
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{
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int devidx;
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struct nl_msg *msg;
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struct nl_cb *cb;
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msg = nlmsg_alloc();
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if (!msg) {
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fprintf(stderr, "failed to allocate netlink message\n");
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return 2;
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}
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cb = nl_cb_alloc(NL_CB_DEFAULT);
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devidx = if_nametoindex(name);
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genlmsg_put(msg, 0, 0, nl_state.nl80211_id, 0,
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0, NL80211_CMD_GET_INTERFACE, 0);
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NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, devidx);
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nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, get_iface_info_handler, iface_info);
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if (nl80211_do_cmd(msg, cb))
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return -1;
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/* Old kernels cant get the current freq via netlink. Try WEXT too :( */
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if (iface_info->pub->current_freq == -1)
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iface_info->pub->current_freq = get_freq_wext(name);
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return 0;
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nla_put_failure:
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fprintf(stderr, "building message failed\n");
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return -1;
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}
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int ws80211_get_iface_info(const char *name, struct ws80211_iface_info *iface_info)
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{
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struct __iface_info __iface_info;
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memset(iface_info, 0, sizeof(*iface_info));
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__iface_info.pub = iface_info;
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__iface_info.type = -1;
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__iface_info.phyidx= -1;
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__iface_info.pub->current_freq = -1;
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__iface_info.pub->current_chan_type = -1;
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return __ws80211_get_iface_info(name, &__iface_info);
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}
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static int ws80211_populate_devices(GArray *interfaces)
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{
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FILE *fh;
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char line[200];
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char *t;
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gchar *t2;
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char *ret;
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int i;
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unsigned int j;
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struct ws80211_iface_info pub;
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struct __iface_info iface_info;
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struct ws80211_interface *iface;
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/* Get a list of phy's that can handle monitor mode */
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ws80211_get_phys(interfaces);
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fh = g_fopen("/proc/net/dev", "r");
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if(!fh) {
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fprintf(stderr, "Cannot open /proc/net/dev");
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return -ENOENT;
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}
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/* Skip the first two lines */
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for (i = 0; i < 2; i++) {
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ret = fgets(line, sizeof(line), fh);
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if (ret == NULL) {
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fprintf(stderr, "Error parsing /proc/net/dev");
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return -1;
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}
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}
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/* Update names of user created monitor interfaces */
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while(fgets(line, sizeof(line), fh)) {
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t = index(line, ':');
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if (!t)
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continue;
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*t = 0;
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t = line;
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while (*t && *t == ' ')
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t++;
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memset(&iface_info, 0, sizeof(iface_info));
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iface_info.pub = &pub;
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__ws80211_get_iface_info(t, &iface_info);
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if (iface_info.type == NL80211_IFTYPE_MONITOR) {
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for (j = 0; j < interfaces->len; j++) {
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iface = g_array_index(interfaces, struct ws80211_interface *, j);
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t2 = g_strdup_printf("phy%d.mon", iface_info.phyidx);
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if (t2) {
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if (!strcmp(t2, iface->ifname)) {
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g_free(iface->ifname);
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iface->ifname = g_strdup(t);
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}
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g_free(t2);
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}
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}
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}
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}
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fclose(fh);
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return 0;
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}
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static int ws80211_iface_up(const char *ifname)
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{
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int sock;
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struct ifreq ifreq;
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sock = socket(AF_PACKET, SOCK_RAW, 0);
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if (sock == -1)
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return -1;
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g_strlcpy(ifreq.ifr_name, ifname, sizeof(ifreq.ifr_name));
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if (ioctl(sock, SIOCGIFFLAGS, &ifreq))
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goto out_err;
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ifreq.ifr_flags |= IFF_UP;
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if (ioctl(sock, SIOCSIFFLAGS, &ifreq))
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goto out_err;
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close(sock);
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return 0;
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out_err:
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close(sock);
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return -1;
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}
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static int ws80211_create_on_demand_interface(const char *name)
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{
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int devidx, phyidx, err;
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struct nl_msg *msg;
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struct nl_cb *cb;
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devidx = if_nametoindex(name);
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if (devidx)
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return 0;
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if (sscanf(name, "phy%d.mon", &phyidx) != 1)
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return -EINVAL;
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cb = nl_cb_alloc(NL_CB_DEFAULT);
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msg = nlmsg_alloc();
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if (!msg) {
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fprintf(stderr, "failed to allocate netlink message\n");
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return 2;
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}
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genlmsg_put(msg, 0, 0, nl_state.nl80211_id, 0,
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0, NL80211_CMD_NEW_INTERFACE, 0);
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NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, phyidx);
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NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, name);
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NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_MONITOR);
|
|
|
|
err = nl80211_do_cmd(msg, cb);
|
|
if (err)
|
|
return err;
|
|
return ws80211_iface_up(name);
|
|
|
|
nla_put_failure:
|
|
fprintf(stderr, "building message failed\n");
|
|
return 2;
|
|
}
|
|
|
|
int ws80211_set_freq(const char *name, int freq, int chan_type)
|
|
{
|
|
int devidx, err;
|
|
struct nl_msg *msg;
|
|
struct nl_cb *cb;
|
|
|
|
err = ws80211_create_on_demand_interface(name);
|
|
if (err)
|
|
return err;
|
|
|
|
msg = nlmsg_alloc();
|
|
if (!msg) {
|
|
fprintf(stderr, "failed to allocate netlink message\n");
|
|
return 2;
|
|
}
|
|
|
|
cb = nl_cb_alloc(NL_CB_DEFAULT);
|
|
|
|
devidx = if_nametoindex(name);
|
|
|
|
genlmsg_put(msg, 0, 0, nl_state.nl80211_id, 0,
|
|
0, NL80211_CMD_SET_CHANNEL, 0);
|
|
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, devidx);
|
|
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq);
|
|
|
|
if (chan_type != -1)
|
|
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_CHANNEL_TYPE, chan_type);
|
|
|
|
err = nl80211_do_cmd(msg, cb);
|
|
return err;
|
|
|
|
nla_put_failure:
|
|
fprintf(stderr, "building message failed\n");
|
|
return 2;
|
|
|
|
}
|
|
|
|
void ws80211_free_interfaces(GArray *interfaces)
|
|
{
|
|
struct ws80211_interface *iface;
|
|
|
|
if (!interfaces)
|
|
return;
|
|
|
|
while (interfaces->len) {
|
|
iface = g_array_index(interfaces, struct ws80211_interface *, 0);
|
|
g_array_remove_index(interfaces, 0);
|
|
g_array_free(iface->frequencies, TRUE);
|
|
g_free(iface->ifname);
|
|
g_free(iface);
|
|
}
|
|
g_array_free(interfaces, TRUE);
|
|
}
|
|
|
|
GArray* ws80211_find_interfaces(void)
|
|
{
|
|
GArray *interfaces;
|
|
|
|
if (!nl_state.nl_sock)
|
|
return NULL;
|
|
|
|
interfaces = g_array_new(FALSE, FALSE, sizeof(struct ws80211_interface *));
|
|
if (!interfaces)
|
|
return NULL;
|
|
|
|
if (ws80211_populate_devices(interfaces)) {
|
|
ws80211_free_interfaces(interfaces);
|
|
return NULL;
|
|
}
|
|
return interfaces;
|
|
}
|
|
|
|
int ws80211_frequency_to_channel(int freq)
|
|
{
|
|
if (freq == 2484)
|
|
return 14;
|
|
|
|
if (freq < 2484)
|
|
return (freq - 2407) / 5;
|
|
|
|
return freq / 5 - 1000;
|
|
}
|
|
|
|
int
|
|
ws80211_str_to_chan_type(gchar *s)
|
|
{
|
|
int ret = -1;
|
|
if (!s)
|
|
return -1;
|
|
|
|
if (!strcmp(s, CHAN_NO_HT))
|
|
ret = WS80211_CHAN_NO_HT;
|
|
if (!strcmp(s, CHAN_HT20))
|
|
ret = WS80211_CHAN_HT20;
|
|
if (!strcmp(s, CHAN_HT40MINUS))
|
|
ret = WS80211_CHAN_HT40MINUS;
|
|
if (!strcmp(s, CHAN_HT40PLUS))
|
|
ret = WS80211_CHAN_HT40PLUS;
|
|
return ret;
|
|
}
|
|
|
|
gchar
|
|
*ws80211_chan_type_to_str(int type)
|
|
{
|
|
switch (type) {
|
|
case WS80211_CHAN_NO_HT:
|
|
return CHAN_NO_HT;
|
|
case WS80211_CHAN_HT20:
|
|
return CHAN_HT20;
|
|
case WS80211_CHAN_HT40MINUS:
|
|
return CHAN_HT40MINUS;
|
|
case WS80211_CHAN_HT40PLUS:
|
|
return CHAN_HT40PLUS;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
#else /* HAVE_LIBNL */
|
|
int ws80211_init(void)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
GArray* ws80211_find_interfaces(void)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
int ws80211_get_iface_info(const char *name _U_, struct ws80211_iface_info *iface_info _U_)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
void ws80211_free_interfaces(GArray *interfaces _U_)
|
|
{
|
|
};
|
|
|
|
int ws80211_frequency_to_channel(int freq _U_)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
int ws80211_set_freq(const char *name _U_, int freq _U_, int chan_type _U_)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
int ws80211_str_to_chan_type(gchar *s _U_)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
gchar *ws80211_chan_type_to_str(int type _U_)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif /* HAVE_LIBNL */
|