/* * iwinfo - Wireless Information Library - NL80211 Backend * * Copyright (C) 2010-2013 Jo-Philipp Wich * * The iwinfo library 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. * * The iwinfo library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with the iwinfo library. If not, see http://www.gnu.org/licenses/. * * The signal handling code is derived from the official madwifi tools, * wlanconfig.c in particular. The encryption property handling was * inspired by the hostapd madwifi driver. * * Parts of this code are derived from the Linux iw utility. */ #include #include "iwinfo_nl80211.h" #define min(x, y) ((x) < (y)) ? (x) : (y) static struct nl80211_state *nls = NULL; static void nl80211_close(void) { if (nls) { if (nls->nlctrl) genl_family_put(nls->nlctrl); if (nls->nl80211) genl_family_put(nls->nl80211); if (nls->nl_sock) nl_socket_free(nls->nl_sock); if (nls->nl_cache) nl_cache_free(nls->nl_cache); free(nls); nls = NULL; } } static int nl80211_init(void) { int err, fd; if (!nls) { nls = malloc(sizeof(struct nl80211_state)); if (!nls) { err = -ENOMEM; goto err; } memset(nls, 0, sizeof(*nls)); nls->nl_sock = nl_socket_alloc(); if (!nls->nl_sock) { err = -ENOMEM; goto err; } if (genl_connect(nls->nl_sock)) { err = -ENOLINK; goto err; } fd = nl_socket_get_fd(nls->nl_sock); if (fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC) < 0) { err = -EINVAL; goto err; } if (genl_ctrl_alloc_cache(nls->nl_sock, &nls->nl_cache)) { err = -ENOMEM; goto err; } nls->nl80211 = genl_ctrl_search_by_name(nls->nl_cache, "nl80211"); if (!nls->nl80211) { err = -ENOENT; goto err; } nls->nlctrl = genl_ctrl_search_by_name(nls->nl_cache, "nlctrl"); if (!nls->nlctrl) { err = -ENOENT; goto err; } } return 0; err: nl80211_close(); return err; } static int nl80211_readint(const char *path) { int fd; int rv = -1; char buffer[16]; if ((fd = open(path, O_RDONLY)) > -1) { if (read(fd, buffer, sizeof(buffer)) > 0) rv = atoi(buffer); close(fd); } return rv; } static int nl80211_msg_error(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg) { int *ret = arg; *ret = err->error; return NL_STOP; } static int nl80211_msg_finish(struct nl_msg *msg, void *arg) { int *ret = arg; *ret = 0; return NL_SKIP; } static int nl80211_msg_ack(struct nl_msg *msg, void *arg) { int *ret = arg; *ret = 0; return NL_STOP; } static int nl80211_msg_response(struct nl_msg *msg, void *arg) { return NL_SKIP; } static void nl80211_free(struct nl80211_msg_conveyor *cv) { if (cv) { if (cv->cb) nl_cb_put(cv->cb); if (cv->msg) nlmsg_free(cv->msg); cv->cb = NULL; cv->msg = NULL; } } static struct nl80211_msg_conveyor * nl80211_new(struct genl_family *family, int cmd, int flags) { static struct nl80211_msg_conveyor cv; struct nl_msg *req = NULL; struct nl_cb *cb = NULL; req = nlmsg_alloc(); if (!req) goto err; cb = nl_cb_alloc(NL_CB_DEFAULT); if (!cb) goto err; genlmsg_put(req, 0, 0, genl_family_get_id(family), 0, flags, cmd, 0); cv.msg = req; cv.cb = cb; return &cv; err: nla_put_failure: if (cb) nl_cb_put(cb); if (req) nlmsg_free(req); return NULL; } static struct nl80211_msg_conveyor * nl80211_ctl(int cmd, int flags) { if (nl80211_init() < 0) return NULL; return nl80211_new(nls->nlctrl, cmd, flags); } static struct nl80211_msg_conveyor * nl80211_msg(const char *ifname, int cmd, int flags) { int ifidx = -1, phyidx = -1; struct nl80211_msg_conveyor *cv; if (ifname == NULL) return NULL; if (nl80211_init() < 0) return NULL; if (!strncmp(ifname, "phy", 3)) phyidx = atoi(&ifname[3]); else if (!strncmp(ifname, "radio", 5)) phyidx = atoi(&ifname[5]); else if (!strncmp(ifname, "mon.", 4)) ifidx = if_nametoindex(&ifname[4]); else ifidx = if_nametoindex(ifname); /* Valid ifidx must be greater than 0 */ if ((ifidx <= 0) && (phyidx < 0)) return NULL; cv = nl80211_new(nls->nl80211, cmd, flags); if (!cv) return NULL; if (ifidx > -1) NLA_PUT_U32(cv->msg, NL80211_ATTR_IFINDEX, ifidx); if (phyidx > -1) NLA_PUT_U32(cv->msg, NL80211_ATTR_WIPHY, phyidx); return cv; nla_put_failure: nl80211_free(cv); return NULL; } static struct nl80211_msg_conveyor * nl80211_send( struct nl80211_msg_conveyor *cv, int (*cb_func)(struct nl_msg *, void *), void *cb_arg ) { static struct nl80211_msg_conveyor rcv; int err = 1; if (cb_func) nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, cb_func, cb_arg); else nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, nl80211_msg_response, &rcv); if (nl_send_auto_complete(nls->nl_sock, cv->msg) < 0) goto err; nl_cb_err(cv->cb, NL_CB_CUSTOM, nl80211_msg_error, &err); nl_cb_set(cv->cb, NL_CB_FINISH, NL_CB_CUSTOM, nl80211_msg_finish, &err); nl_cb_set(cv->cb, NL_CB_ACK, NL_CB_CUSTOM, nl80211_msg_ack, &err); while (err > 0) nl_recvmsgs(nls->nl_sock, cv->cb); return &rcv; err: nl_cb_put(cv->cb); nlmsg_free(cv->msg); return NULL; } static struct nlattr ** nl80211_parse(struct nl_msg *msg) { struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg)); static struct nlattr *attr[NL80211_ATTR_MAX + 1]; nla_parse(attr, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL); return attr; } static int nl80211_subscribe_cb(struct nl_msg *msg, void *arg) { struct nl80211_group_conveyor *cv = arg; struct nlattr **attr = nl80211_parse(msg); struct nlattr *mgrpinfo[CTRL_ATTR_MCAST_GRP_MAX + 1]; struct nlattr *mgrp; int mgrpidx; if (!attr[CTRL_ATTR_MCAST_GROUPS]) return NL_SKIP; nla_for_each_nested(mgrp, attr[CTRL_ATTR_MCAST_GROUPS], mgrpidx) { nla_parse(mgrpinfo, CTRL_ATTR_MCAST_GRP_MAX, nla_data(mgrp), nla_len(mgrp), NULL); if (mgrpinfo[CTRL_ATTR_MCAST_GRP_ID] && mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME] && !strncmp(nla_data(mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME]), cv->name, nla_len(mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME]))) { cv->id = nla_get_u32(mgrpinfo[CTRL_ATTR_MCAST_GRP_ID]); break; } } return NL_SKIP; } static int nl80211_subscribe(const char *family, const char *group) { struct nl80211_group_conveyor cv = { .name = group, .id = -ENOENT }; struct nl80211_msg_conveyor *req; req = nl80211_ctl(CTRL_CMD_GETFAMILY, 0); if (req) { NLA_PUT_STRING(req->msg, CTRL_ATTR_FAMILY_NAME, family); nl80211_send(req, nl80211_subscribe_cb, &cv); nla_put_failure: nl80211_free(req); } return nl_socket_add_membership(nls->nl_sock, cv.id); } static int nl80211_wait_cb(struct nl_msg *msg, void *arg) { struct nl80211_event_conveyor *cv = arg; struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg)); if (gnlh->cmd == cv->wait) cv->recv = gnlh->cmd; return NL_SKIP; } static int nl80211_wait_seq_check(struct nl_msg *msg, void *arg) { return NL_OK; } static int nl80211_wait(const char *family, const char *group, int cmd) { struct nl80211_event_conveyor cv = { .wait = cmd }; struct nl_cb *cb; if (nl80211_subscribe(family, group)) return -ENOENT; cb = nl_cb_alloc(NL_CB_DEFAULT); if (!cb) return -ENOMEM; nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, nl80211_wait_seq_check, NULL); nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, nl80211_wait_cb, &cv ); while (!cv.recv) nl_recvmsgs(nls->nl_sock, cb); nl_cb_put(cb); return 0; } static int nl80211_freq2channel(int freq) { if (freq == 2484) return 14; else if (freq < 2484) return (freq - 2407) / 5; else if (freq >= 4910 && freq <= 4980) return (freq - 4000) / 5; else return (freq - 5000) / 5; } static int nl80211_channel2freq(int channel, const char *band) { if (!band || band[0] != 'a') { if (channel == 14) return 2484; else if (channel < 14) return (channel * 5) + 2407; } else { if (channel >= 182 && channel <= 196) return (channel * 5) + 4000; else return (channel * 5) + 5000; } return 0; } static char * nl80211_getval(const char *ifname, const char *buf, const char *key) { int i, len; char lkey[64] = { 0 }; const char *ln = buf; static char lval[256] = { 0 }; int matched_if = ifname ? 0 : 1; for( i = 0, len = strlen(buf); i < len; i++ ) { if (!lkey[0] && (buf[i] == ' ' || buf[i] == '\t')) { ln++; } else if (!lkey[0] && (buf[i] == '=')) { if ((&buf[i] - ln) > 0) memcpy(lkey, ln, min(sizeof(lkey) - 1, &buf[i] - ln)); } else if (buf[i] == '\n') { if (lkey[0]) { memcpy(lval, ln + strlen(lkey) + 1, min(sizeof(lval) - 1, &buf[i] - ln - strlen(lkey) - 1)); if ((ifname != NULL) && (!strcmp(lkey, "interface") || !strcmp(lkey, "bss")) ) { matched_if = !strcmp(lval, ifname); } else if (matched_if && !strcmp(lkey, key)) { return lval; } } ln = &buf[i+1]; memset(lkey, 0, sizeof(lkey)); memset(lval, 0, sizeof(lval)); } } return NULL; } static int nl80211_ifname2phy_cb(struct nl_msg *msg, void *arg) { char *buf = arg; struct nlattr **attr = nl80211_parse(msg); if (attr[NL80211_ATTR_WIPHY_NAME]) memcpy(buf, nla_data(attr[NL80211_ATTR_WIPHY_NAME]), nla_len(attr[NL80211_ATTR_WIPHY_NAME])); else buf[0] = 0; return NL_SKIP; } static char * nl80211_ifname2phy(const char *ifname) { static char phy[32] = { 0 }; struct nl80211_msg_conveyor *req; memset(phy, 0, sizeof(phy)); req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0); if (req) { nl80211_send(req, nl80211_ifname2phy_cb, phy); nl80211_free(req); } return phy[0] ? phy : NULL; } static char * nl80211_phy2ifname(const char *ifname) { int fd, ifidx = -1, cifidx = -1, phyidx = -1; char buffer[64]; static char nif[IFNAMSIZ] = { 0 }; DIR *d; struct dirent *e; /* Only accept phy name of the form phy%d or radio%d */ if (!ifname) return NULL; else if (!strncmp(ifname, "phy", 3)) phyidx = atoi(&ifname[3]); else if (!strncmp(ifname, "radio", 5)) phyidx = atoi(&ifname[5]); else return NULL; memset(nif, 0, sizeof(nif)); if (phyidx > -1) { if ((d = opendir("/sys/class/net")) != NULL) { while ((e = readdir(d)) != NULL) { snprintf(buffer, sizeof(buffer), "/sys/class/net/%s/phy80211/index", e->d_name); if (nl80211_readint(buffer) == phyidx) { snprintf(buffer, sizeof(buffer), "/sys/class/net/%s/ifindex", e->d_name); if ((cifidx = nl80211_readint(buffer)) >= 0 && ((ifidx < 0) || (cifidx < ifidx))) { ifidx = cifidx; strncpy(nif, e->d_name, sizeof(nif)); } } } closedir(d); } } return nif[0] ? nif : NULL; } static int nl80211_get_mode_cb(struct nl_msg *msg, void *arg) { int *mode = arg; struct nlattr **tb = nl80211_parse(msg); const int ifmodes[NL80211_IFTYPE_MAX + 1] = { IWINFO_OPMODE_UNKNOWN, /* unspecified */ IWINFO_OPMODE_ADHOC, /* IBSS */ IWINFO_OPMODE_CLIENT, /* managed */ IWINFO_OPMODE_MASTER, /* AP */ IWINFO_OPMODE_AP_VLAN, /* AP/VLAN */ IWINFO_OPMODE_WDS, /* WDS */ IWINFO_OPMODE_MONITOR, /* monitor */ IWINFO_OPMODE_MESHPOINT, /* mesh point */ IWINFO_OPMODE_P2P_CLIENT, /* P2P-client */ IWINFO_OPMODE_P2P_GO, /* P2P-GO */ }; if (tb[NL80211_ATTR_IFTYPE]) *mode = ifmodes[nla_get_u32(tb[NL80211_ATTR_IFTYPE])]; return NL_SKIP; } static int nl80211_get_mode(const char *ifname, int *buf) { char *res; struct nl80211_msg_conveyor *req; res = nl80211_phy2ifname(ifname); req = nl80211_msg(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0); *buf = IWINFO_OPMODE_UNKNOWN; if (req) { nl80211_send(req, nl80211_get_mode_cb, buf); nl80211_free(req); } return (*buf == IWINFO_OPMODE_UNKNOWN) ? -1 : 0; } static char * nl80211_hostapd_info(const char *ifname) { int mode; char *phy; char path[32] = { 0 }; static char buf[4096] = { 0 }; FILE *conf; if (nl80211_get_mode(ifname, &mode)) return NULL; if ((mode == IWINFO_OPMODE_MASTER || mode == IWINFO_OPMODE_AP_VLAN) && (phy = nl80211_ifname2phy(ifname)) != NULL) { snprintf(path, sizeof(path), "/var/run/hostapd-%s.conf", phy); if ((conf = fopen(path, "r")) != NULL) { fread(buf, sizeof(buf) - 1, 1, conf); fclose(conf); return buf; } } return NULL; } static inline int nl80211_wpactl_recv(int sock, char *buf, int blen) { fd_set rfds; struct timeval tv = { 2, 0 }; FD_ZERO(&rfds); FD_SET(sock, &rfds); memset(buf, 0, blen); if (select(sock + 1, &rfds, NULL, NULL, &tv) < 0) return -1; if (!FD_ISSET(sock, &rfds)) return -1; return recv(sock, buf, blen, 0); } static char * nl80211_wpactl_info(const char *ifname, const char *cmd, const char *event) { int numtry = 0; int sock = -1; char *rv = NULL; size_t remote_length, local_length; static char buffer[10240] = { 0 }; struct sockaddr_un local = { 0 }; struct sockaddr_un remote = { 0 }; sock = socket(PF_UNIX, SOCK_DGRAM, 0); if (sock < 0) return NULL; remote.sun_family = AF_UNIX; remote_length = sizeof(remote.sun_family) + sprintf(remote.sun_path, "/var/run/wpa_supplicant-%s/%s", ifname, ifname); if (fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC) < 0) goto out; if (connect(sock, (struct sockaddr *) &remote, remote_length)) { remote_length = sizeof(remote.sun_family) + sprintf(remote.sun_path, "/var/run/wpa_supplicant/%s", ifname); if (connect(sock, (struct sockaddr *) &remote, remote_length)) goto out; } local.sun_family = AF_UNIX; local_length = sizeof(local.sun_family) + sprintf(local.sun_path, "/var/run/iwinfo-%s-%d", ifname, getpid()); if (bind(sock, (struct sockaddr *) &local, local_length)) goto out; if (event) { send(sock, "ATTACH", 6, 0); if (nl80211_wpactl_recv(sock, buffer, sizeof(buffer)-1) <= 0) goto out; } send(sock, cmd, strlen(cmd), 0); /* we might have to scan up to 72 channels / 256ms per channel */ /* this makes up to 18.5s hence 10 tries */ while( numtry++ < 10 ) { char *bracket; /* make sure there is a terminating nul byte */ if (nl80211_wpactl_recv(sock, buffer, sizeof(buffer)-1) <= 0) { if (event) continue; break; } if ((!event && buffer[0] != '<') || (event && strstr(buffer, event))) break; /* there may be more than max(numtry) BSS-ADDED events */ /* ignore them similar to wpa_cli */ if (buffer[0] == '<' && (bracket=strchr(buffer,'>')) != NULL && strncmp(bracket+1,"CTRL-EVENT-BSS-ADDED",20) == 0) numtry--; } rv = buffer; out: close(sock); if (local.sun_family) unlink(local.sun_path); return rv; } static char * nl80211_ifadd(const char *ifname) { int phyidx; char *rv = NULL, path[PATH_MAX]; static char nif[IFNAMSIZ] = { 0 }; struct nl80211_msg_conveyor *req, *res; FILE *sysfs; req = nl80211_msg(ifname, NL80211_CMD_NEW_INTERFACE, 0); if (req) { snprintf(nif, sizeof(nif), "tmp.%s", ifname); NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, nif); NLA_PUT_U32(req->msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_STATION); nl80211_send(req, NULL, NULL); snprintf(path, sizeof(path) - 1, "/proc/sys/net/ipv6/conf/%s/disable_ipv6", nif); if ((sysfs = fopen(path, "w")) != NULL) { fwrite("0\n", 1, 2, sysfs); fclose(sysfs); } rv = nif; nla_put_failure: nl80211_free(req); } return rv; } static void nl80211_ifdel(const char *ifname) { struct nl80211_msg_conveyor *req; req = nl80211_msg(ifname, NL80211_CMD_DEL_INTERFACE, 0); if (req) { NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, ifname); nl80211_send(req, NULL, NULL); nla_put_failure: nl80211_free(req); } } static void nl80211_hostapd_hup(const char *ifname) { int fd, pid = 0; char buf[32]; char *phy = nl80211_ifname2phy(ifname); if (phy) { snprintf(buf, sizeof(buf), "/var/run/wifi-%s.pid", phy); if ((fd = open(buf, O_RDONLY)) > 0) { if (read(fd, buf, sizeof(buf)) > 0) pid = atoi(buf); close(fd); } if (pid > 0) kill(pid, 1); } } static int nl80211_probe(const char *ifname) { return !!nl80211_ifname2phy(ifname); } struct nl80211_ssid_bssid { unsigned char *ssid; unsigned char bssid[7]; }; static int nl80211_get_ssid_bssid_cb(struct nl_msg *msg, void *arg) { int ielen; unsigned char *ie; struct nl80211_ssid_bssid *sb = arg; struct nlattr **tb = nl80211_parse(msg); struct nlattr *bss[NL80211_BSS_MAX + 1]; static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = { [NL80211_BSS_INFORMATION_ELEMENTS] = { }, [NL80211_BSS_STATUS] = { .type = NLA_U32 }, }; if (!tb[NL80211_ATTR_BSS] || nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS], bss_policy) || !bss[NL80211_BSS_BSSID] || !bss[NL80211_BSS_STATUS] || !bss[NL80211_BSS_INFORMATION_ELEMENTS]) { return NL_SKIP; } switch (nla_get_u32(bss[NL80211_BSS_STATUS])) { case NL80211_BSS_STATUS_ASSOCIATED: case NL80211_BSS_STATUS_AUTHENTICATED: case NL80211_BSS_STATUS_IBSS_JOINED: if (sb->ssid) { ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]); ielen = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]); while (ielen >= 2 && ielen >= ie[1]) { if (ie[0] == 0) { memcpy(sb->ssid, ie + 2, min(ie[1], IWINFO_ESSID_MAX_SIZE)); return NL_SKIP; } ielen -= ie[1] + 2; ie += ie[1] + 2; } } else { sb->bssid[0] = 1; memcpy(sb->bssid + 1, nla_data(bss[NL80211_BSS_BSSID]), 6); return NL_SKIP; } default: return NL_SKIP; } } static int nl80211_get_ssid(const char *ifname, char *buf) { char *res; struct nl80211_msg_conveyor *req; struct nl80211_ssid_bssid sb; /* try to find ssid from scan dump results */ res = nl80211_phy2ifname(ifname); req = nl80211_msg(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP); sb.ssid = buf; *buf = 0; if (req) { nl80211_send(req, nl80211_get_ssid_bssid_cb, &sb); nl80211_free(req); } /* failed, try to find from hostapd info */ if ((*buf == 0) && (res = nl80211_hostapd_info(ifname)) && (res = nl80211_getval(ifname, res, "ssid"))) { memcpy(buf, res, strlen(res)); } return (*buf == 0) ? -1 : 0; } static int nl80211_get_bssid(const char *ifname, char *buf) { char *res; struct nl80211_msg_conveyor *req; struct nl80211_ssid_bssid sb; /* try to find bssid from scan dump results */ res = nl80211_phy2ifname(ifname); req = nl80211_msg(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP); sb.ssid = NULL; sb.bssid[0] = 0; if (req) { nl80211_send(req, nl80211_get_ssid_bssid_cb, &sb); nl80211_free(req); } /* failed, try to find mac from hostapd info */ if ((sb.bssid[0] == 0) && (res = nl80211_hostapd_info(ifname)) && (res = nl80211_getval(ifname, res, "bssid"))) { sb.bssid[0] = 1; sb.bssid[1] = strtol(&res[0], NULL, 16); sb.bssid[2] = strtol(&res[3], NULL, 16); sb.bssid[3] = strtol(&res[6], NULL, 16); sb.bssid[4] = strtol(&res[9], NULL, 16); sb.bssid[5] = strtol(&res[12], NULL, 16); sb.bssid[6] = strtol(&res[15], NULL, 16); } if (sb.bssid[0]) { sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X", sb.bssid[1], sb.bssid[2], sb.bssid[3], sb.bssid[4], sb.bssid[5], sb.bssid[6]); return 0; } return -1; } static int nl80211_get_frequency_scan_cb(struct nl_msg *msg, void *arg) { int *freq = arg; struct nlattr **attr = nl80211_parse(msg); struct nlattr *binfo[NL80211_BSS_MAX + 1]; static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = { [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 }, [NL80211_BSS_STATUS] = { .type = NLA_U32 }, }; if (attr[NL80211_ATTR_BSS] && !nla_parse_nested(binfo, NL80211_BSS_MAX, attr[NL80211_ATTR_BSS], bss_policy)) { if (binfo[NL80211_BSS_STATUS] && binfo[NL80211_BSS_FREQUENCY]) *freq = nla_get_u32(binfo[NL80211_BSS_FREQUENCY]); } return NL_SKIP; } static int nl80211_get_frequency_info_cb(struct nl_msg *msg, void *arg) { int *freq = arg; struct nlattr **tb = nl80211_parse(msg); if (tb[NL80211_ATTR_WIPHY_FREQ]) *freq = nla_get_u32(tb[NL80211_ATTR_WIPHY_FREQ]); return NL_SKIP; } static int nl80211_get_frequency(const char *ifname, int *buf) { int chn; char *res, *channel; struct nl80211_msg_conveyor *req; /* try to find frequency from interface info */ res = nl80211_phy2ifname(ifname); req = nl80211_msg(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0); *buf = 0; if (req) { nl80211_send(req, nl80211_get_frequency_info_cb, buf); nl80211_free(req); } /* failed, try to find frequency from hostapd info */ if ((*buf == 0) && (res = nl80211_hostapd_info(ifname)) && (channel = nl80211_getval(NULL, res, "channel"))) { chn = atoi(channel); *buf = nl80211_channel2freq(chn, nl80211_getval(NULL, res, "hw_mode")); } else { /* failed, try to find frequency from scan results */ if (*buf == 0) { res = nl80211_phy2ifname(ifname); req = nl80211_msg(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP); if (req) { nl80211_send(req, nl80211_get_frequency_scan_cb, buf); nl80211_free(req); } } } return (*buf == 0) ? -1 : 0; } static int nl80211_get_channel(const char *ifname, int *buf) { if (!nl80211_get_frequency(ifname, buf)) { *buf = nl80211_freq2channel(*buf); return 0; } return -1; } static int nl80211_get_txpower(const char *ifname, int *buf) { #if 0 char *res; char path[PATH_MAX]; res = nl80211_ifname2phy(ifname); snprintf(path, sizeof(path), "/sys/kernel/debug/ieee80211/%s/power", res ? res : ifname); if ((*buf = nl80211_readint(path)) > -1) return 0; #endif return wext_ops.txpower(ifname, buf); } static int nl80211_fill_signal_cb(struct nl_msg *msg, void *arg) { int8_t dbm; int16_t mbit; struct nl80211_rssi_rate *rr = arg; struct nlattr **attr = nl80211_parse(msg); struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1]; struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1]; static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = { [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32 }, [NL80211_STA_INFO_RX_BYTES] = { .type = NLA_U32 }, [NL80211_STA_INFO_TX_BYTES] = { .type = NLA_U32 }, [NL80211_STA_INFO_RX_PACKETS] = { .type = NLA_U32 }, [NL80211_STA_INFO_TX_PACKETS] = { .type = NLA_U32 }, [NL80211_STA_INFO_SIGNAL] = { .type = NLA_U8 }, [NL80211_STA_INFO_TX_BITRATE] = { .type = NLA_NESTED }, [NL80211_STA_INFO_LLID] = { .type = NLA_U16 }, [NL80211_STA_INFO_PLID] = { .type = NLA_U16 }, [NL80211_STA_INFO_PLINK_STATE] = { .type = NLA_U8 }, }; static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = { [NL80211_RATE_INFO_BITRATE] = { .type = NLA_U16 }, [NL80211_RATE_INFO_MCS] = { .type = NLA_U8 }, [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG }, [NL80211_RATE_INFO_SHORT_GI] = { .type = NLA_FLAG }, }; if (attr[NL80211_ATTR_STA_INFO]) { if (!nla_parse_nested(sinfo, NL80211_STA_INFO_MAX, attr[NL80211_ATTR_STA_INFO], stats_policy)) { if (sinfo[NL80211_STA_INFO_SIGNAL]) { dbm = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]); rr->rssi = rr->rssi ? (int8_t)((rr->rssi + dbm) / 2) : dbm; } if (sinfo[NL80211_STA_INFO_TX_BITRATE]) { if (!nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX, sinfo[NL80211_STA_INFO_TX_BITRATE], rate_policy)) { if (rinfo[NL80211_RATE_INFO_BITRATE]) { mbit = nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]); rr->rate = rr->rate ? (int16_t)((rr->rate + mbit) / 2) : mbit; } } } } } return NL_SKIP; } static void nl80211_fill_signal(const char *ifname, struct nl80211_rssi_rate *r) { DIR *d; struct dirent *de; struct nl80211_msg_conveyor *req; r->rssi = 0; r->rate = 0; if ((d = opendir("/sys/class/net")) != NULL) { while ((de = readdir(d)) != NULL) { if (!strncmp(de->d_name, ifname, strlen(ifname)) && (!de->d_name[strlen(ifname)] || !strncmp(&de->d_name[strlen(ifname)], ".sta", 4))) { req = nl80211_msg(de->d_name, NL80211_CMD_GET_STATION, NLM_F_DUMP); if (req) { nl80211_send(req, nl80211_fill_signal_cb, r); nl80211_free(req); } } } closedir(d); } } static int nl80211_get_bitrate(const char *ifname, int *buf) { struct nl80211_rssi_rate rr; nl80211_fill_signal(ifname, &rr); if (rr.rate) { *buf = (rr.rate * 100); return 0; } return -1; } static int nl80211_get_signal(const char *ifname, int *buf) { struct nl80211_rssi_rate rr; nl80211_fill_signal(ifname, &rr); if (rr.rssi) { *buf = rr.rssi; return 0; } return -1; } static int nl80211_get_noise_cb(struct nl_msg *msg, void *arg) { int8_t *noise = arg; struct nlattr **tb = nl80211_parse(msg); struct nlattr *si[NL80211_SURVEY_INFO_MAX + 1]; static struct nla_policy sp[NL80211_SURVEY_INFO_MAX + 1] = { [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 }, [NL80211_SURVEY_INFO_NOISE] = { .type = NLA_U8 }, }; if (!tb[NL80211_ATTR_SURVEY_INFO]) return NL_SKIP; if (nla_parse_nested(si, NL80211_SURVEY_INFO_MAX, tb[NL80211_ATTR_SURVEY_INFO], sp)) return NL_SKIP; if (!si[NL80211_SURVEY_INFO_NOISE]) return NL_SKIP; if (!*noise || si[NL80211_SURVEY_INFO_IN_USE]) *noise = (int8_t)nla_get_u8(si[NL80211_SURVEY_INFO_NOISE]); return NL_SKIP; } static int nl80211_get_noise(const char *ifname, int *buf) { int8_t noise; struct nl80211_msg_conveyor *req; req = nl80211_msg(ifname, NL80211_CMD_GET_SURVEY, NLM_F_DUMP); if (req) { noise = 0; nl80211_send(req, nl80211_get_noise_cb, &noise); nl80211_free(req); if (noise) { *buf = noise; return 0; } } return -1; } static int nl80211_get_quality(const char *ifname, int *buf) { int signal; if (!nl80211_get_signal(ifname, &signal)) { /* A positive signal level is usually just a quality * value, pass through as-is */ if (signal >= 0) { *buf = signal; } /* The cfg80211 wext compat layer assumes a signal range * of -110 dBm to -40 dBm, the quality value is derived * by adding 110 to the signal level */ else { if (signal < -110) signal = -110; else if (signal > -40) signal = -40; *buf = (signal + 110); } return 0; } return -1; } static int nl80211_get_quality_max(const char *ifname, int *buf) { /* The cfg80211 wext compat layer assumes a maximum * quality of 70 */ *buf = 70; return 0; } static int nl80211_get_encryption(const char *ifname, char *buf) { int i; char k[9]; char *val, *res; struct iwinfo_crypto_entry *c = (struct iwinfo_crypto_entry *)buf; /* WPA supplicant */ if ((res = nl80211_wpactl_info(ifname, "STATUS", NULL)) && (val = nl80211_getval(NULL, res, "pairwise_cipher"))) { /* WEP */ if (strstr(val, "WEP")) { if (strstr(val, "WEP-40")) c->pair_ciphers |= IWINFO_CIPHER_WEP40; else if (strstr(val, "WEP-104")) c->pair_ciphers |= IWINFO_CIPHER_WEP104; c->enabled = 1; c->group_ciphers = c->pair_ciphers; c->auth_suites |= IWINFO_KMGMT_NONE; c->auth_algs |= IWINFO_AUTH_OPEN; /* XXX: assumption */ } /* WPA */ else { if (strstr(val, "TKIP")) c->pair_ciphers |= IWINFO_CIPHER_TKIP; else if (strstr(val, "CCMP")) c->pair_ciphers |= IWINFO_CIPHER_CCMP; else if (strstr(val, "NONE")) c->pair_ciphers |= IWINFO_CIPHER_NONE; else if (strstr(val, "WEP-40")) c->pair_ciphers |= IWINFO_CIPHER_WEP40; else if (strstr(val, "WEP-104")) c->pair_ciphers |= IWINFO_CIPHER_WEP104; if ((val = nl80211_getval(NULL, res, "group_cipher"))) { if (strstr(val, "TKIP")) c->group_ciphers |= IWINFO_CIPHER_TKIP; else if (strstr(val, "CCMP")) c->group_ciphers |= IWINFO_CIPHER_CCMP; else if (strstr(val, "NONE")) c->group_ciphers |= IWINFO_CIPHER_NONE; else if (strstr(val, "WEP-40")) c->group_ciphers |= IWINFO_CIPHER_WEP40; else if (strstr(val, "WEP-104")) c->group_ciphers |= IWINFO_CIPHER_WEP104; } if ((val = nl80211_getval(NULL, res, "key_mgmt"))) { if (strstr(val, "WPA2")) c->wpa_version = 2; else if (strstr(val, "WPA")) c->wpa_version = 1; if (strstr(val, "PSK")) c->auth_suites |= IWINFO_KMGMT_PSK; else if (strstr(val, "EAP") || strstr(val, "802.1X")) c->auth_suites |= IWINFO_KMGMT_8021x; else if (strstr(val, "NONE")) c->auth_suites |= IWINFO_KMGMT_NONE; } c->enabled = (c->wpa_version && c->auth_suites) ? 1 : 0; } return 0; } /* Hostapd */ else if ((res = nl80211_hostapd_info(ifname))) { if ((val = nl80211_getval(ifname, res, "wpa")) != NULL) c->wpa_version = atoi(val); val = nl80211_getval(ifname, res, "wpa_key_mgmt"); if (!val || strstr(val, "PSK")) c->auth_suites |= IWINFO_KMGMT_PSK; if (val && strstr(val, "EAP")) c->auth_suites |= IWINFO_KMGMT_8021x; if (val && strstr(val, "NONE")) c->auth_suites |= IWINFO_KMGMT_NONE; if ((val = nl80211_getval(ifname, res, "wpa_pairwise")) != NULL) { if (strstr(val, "TKIP")) c->pair_ciphers |= IWINFO_CIPHER_TKIP; if (strstr(val, "CCMP")) c->pair_ciphers |= IWINFO_CIPHER_CCMP; if (strstr(val, "NONE")) c->pair_ciphers |= IWINFO_CIPHER_NONE; } if ((val = nl80211_getval(ifname, res, "auth_algs")) != NULL) { switch(atoi(val)) { case 1: c->auth_algs |= IWINFO_AUTH_OPEN; break; case 2: c->auth_algs |= IWINFO_AUTH_SHARED; break; case 3: c->auth_algs |= IWINFO_AUTH_OPEN; c->auth_algs |= IWINFO_AUTH_SHARED; break; default: break; } for (i = 0; i < 4; i++) { snprintf(k, sizeof(k), "wep_key%d", i); if ((val = nl80211_getval(ifname, res, k))) { if ((strlen(val) == 5) || (strlen(val) == 10)) c->pair_ciphers |= IWINFO_CIPHER_WEP40; else if ((strlen(val) == 13) || (strlen(val) == 26)) c->pair_ciphers |= IWINFO_CIPHER_WEP104; } } } c->group_ciphers = c->pair_ciphers; c->enabled = (c->wpa_version || c->pair_ciphers) ? 1 : 0; return 0; } return -1; } static int nl80211_get_phyname(const char *ifname, char *buf) { const char *name; name = nl80211_ifname2phy(ifname); if (name) { strcpy(buf, name); return 0; } else if ((name = nl80211_phy2ifname(ifname)) != NULL) { name = nl80211_ifname2phy(name); if (name) { strcpy(buf, ifname); return 0; } } return -1; } static int nl80211_get_assoclist_cb(struct nl_msg *msg, void *arg) { struct nl80211_array_buf *arr = arg; struct iwinfo_assoclist_entry *e = arr->buf; struct nlattr **attr = nl80211_parse(msg); struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1]; struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1]; static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = { [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32 }, [NL80211_STA_INFO_RX_PACKETS] = { .type = NLA_U32 }, [NL80211_STA_INFO_TX_PACKETS] = { .type = NLA_U32 }, [NL80211_STA_INFO_RX_BITRATE] = { .type = NLA_NESTED }, [NL80211_STA_INFO_TX_BITRATE] = { .type = NLA_NESTED }, [NL80211_STA_INFO_SIGNAL] = { .type = NLA_U8 }, }; static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = { [NL80211_RATE_INFO_BITRATE] = { .type = NLA_U16 }, [NL80211_RATE_INFO_MCS] = { .type = NLA_U8 }, [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG }, [NL80211_RATE_INFO_SHORT_GI] = { .type = NLA_FLAG }, }; /* advance to end of array */ e += arr->count; memset(e, 0, sizeof(*e)); if (attr[NL80211_ATTR_MAC]) memcpy(e->mac, nla_data(attr[NL80211_ATTR_MAC]), 6); if (attr[NL80211_ATTR_STA_INFO] && !nla_parse_nested(sinfo, NL80211_STA_INFO_MAX, attr[NL80211_ATTR_STA_INFO], stats_policy)) { if (sinfo[NL80211_STA_INFO_SIGNAL]) e->signal = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]); if (sinfo[NL80211_STA_INFO_INACTIVE_TIME]) e->inactive = nla_get_u32(sinfo[NL80211_STA_INFO_INACTIVE_TIME]); if (sinfo[NL80211_STA_INFO_RX_PACKETS]) e->rx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_RX_PACKETS]); if (sinfo[NL80211_STA_INFO_TX_PACKETS]) e->tx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_TX_PACKETS]); if (sinfo[NL80211_STA_INFO_RX_BITRATE] && !nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX, sinfo[NL80211_STA_INFO_RX_BITRATE], rate_policy)) { if (rinfo[NL80211_RATE_INFO_BITRATE]) e->rx_rate.rate = nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]) * 100; if (rinfo[NL80211_RATE_INFO_MCS]) e->rx_rate.mcs = nla_get_u8(rinfo[NL80211_RATE_INFO_MCS]); if (rinfo[NL80211_RATE_INFO_40_MHZ_WIDTH]) e->rx_rate.is_40mhz = 1; if (rinfo[NL80211_RATE_INFO_SHORT_GI]) e->rx_rate.is_short_gi = 1; } if (sinfo[NL80211_STA_INFO_TX_BITRATE] && !nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX, sinfo[NL80211_STA_INFO_TX_BITRATE], rate_policy)) { if (rinfo[NL80211_RATE_INFO_BITRATE]) e->tx_rate.rate = nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]) * 100; if (rinfo[NL80211_RATE_INFO_MCS]) e->tx_rate.mcs = nla_get_u8(rinfo[NL80211_RATE_INFO_MCS]); if (rinfo[NL80211_RATE_INFO_40_MHZ_WIDTH]) e->tx_rate.is_40mhz = 1; if (rinfo[NL80211_RATE_INFO_SHORT_GI]) e->tx_rate.is_short_gi = 1; } } e->noise = 0; /* filled in by caller */ arr->count++; return NL_SKIP; } static int nl80211_get_assoclist(const char *ifname, char *buf, int *len) { DIR *d; int i, noise = 0; struct dirent *de; struct nl80211_msg_conveyor *req; struct nl80211_array_buf arr = { .buf = buf, .count = 0 }; struct iwinfo_assoclist_entry *e; if ((d = opendir("/sys/class/net")) != NULL) { while ((de = readdir(d)) != NULL) { if (!strncmp(de->d_name, ifname, strlen(ifname)) && (!de->d_name[strlen(ifname)] || !strncmp(&de->d_name[strlen(ifname)], ".sta", 4))) { req = nl80211_msg(de->d_name, NL80211_CMD_GET_STATION, NLM_F_DUMP); if (req) { nl80211_send(req, nl80211_get_assoclist_cb, &arr); nl80211_free(req); } } } closedir(d); if (!nl80211_get_noise(ifname, &noise)) for (i = 0, e = arr.buf; i < arr.count; i++, e++) e->noise = noise; *len = (arr.count * sizeof(struct iwinfo_assoclist_entry)); return 0; } return -1; } static int nl80211_get_txpwrlist_cb(struct nl_msg *msg, void *arg) { int *dbm_max = arg; int ch_cur, ch_cmp, bands_remain, freqs_remain; struct nlattr **attr = nl80211_parse(msg); struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1]; struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1]; struct nlattr *band, *freq; static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = { [NL80211_FREQUENCY_ATTR_FREQ] = { .type = NLA_U32 }, [NL80211_FREQUENCY_ATTR_DISABLED] = { .type = NLA_FLAG }, [NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG }, [NL80211_FREQUENCY_ATTR_NO_IBSS] = { .type = NLA_FLAG }, [NL80211_FREQUENCY_ATTR_RADAR] = { .type = NLA_FLAG }, [NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32 }, }; ch_cur = *dbm_max; /* value int* is initialized with channel by caller */ *dbm_max = -1; nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain) { nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band), nla_len(band), NULL); nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS], freqs_remain) { nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX, nla_data(freq), nla_len(freq), freq_policy); ch_cmp = nl80211_freq2channel(nla_get_u32( freqs[NL80211_FREQUENCY_ATTR_FREQ])); if ((!ch_cur || (ch_cmp == ch_cur)) && freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER]) { *dbm_max = (int)(0.01 * nla_get_u32( freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER])); break; } } } return NL_SKIP; } static int nl80211_get_txpwrlist(const char *ifname, char *buf, int *len) { int ch_cur; int dbm_max = -1, dbm_cur, dbm_cnt; struct nl80211_msg_conveyor *req; struct iwinfo_txpwrlist_entry entry; if (nl80211_get_channel(ifname, &ch_cur)) ch_cur = 0; req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0); if (req) { /* initialize the value pointer with channel for callback */ dbm_max = ch_cur; nl80211_send(req, nl80211_get_txpwrlist_cb, &dbm_max); nl80211_free(req); } if (dbm_max > 0) { for (dbm_cur = 0, dbm_cnt = 0; dbm_cur < dbm_max; dbm_cur++, dbm_cnt++) { entry.dbm = dbm_cur; entry.mw = iwinfo_dbm2mw(dbm_cur); memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry)); } entry.dbm = dbm_max; entry.mw = iwinfo_dbm2mw(dbm_max); memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry)); dbm_cnt++; *len = dbm_cnt * sizeof(entry); return 0; } return -1; } static void nl80211_get_scancrypto(const char *spec, struct iwinfo_crypto_entry *c) { if (strstr(spec, "WPA") || strstr(spec, "WEP")) { c->enabled = 1; if (strstr(spec, "WPA2-") && strstr(spec, "WPA-")) c->wpa_version = 3; else if (strstr(spec, "WPA2")) c->wpa_version = 2; else if (strstr(spec, "WPA")) c->wpa_version = 1; else if (strstr(spec, "WEP")) c->auth_algs = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED; if (strstr(spec, "PSK")) c->auth_suites |= IWINFO_KMGMT_PSK; if (strstr(spec, "802.1X") || strstr(spec, "EAP")) c->auth_suites |= IWINFO_KMGMT_8021x; if (strstr(spec, "WPA-NONE")) c->auth_suites |= IWINFO_KMGMT_NONE; if (strstr(spec, "TKIP")) c->pair_ciphers |= IWINFO_CIPHER_TKIP; if (strstr(spec, "CCMP")) c->pair_ciphers |= IWINFO_CIPHER_CCMP; if (strstr(spec, "WEP-40")) c->pair_ciphers |= IWINFO_CIPHER_WEP40; if (strstr(spec, "WEP-104")) c->pair_ciphers |= IWINFO_CIPHER_WEP104; c->group_ciphers = c->pair_ciphers; } else { c->enabled = 0; } } struct nl80211_scanlist { struct iwinfo_scanlist_entry *e; int len; }; static void nl80211_get_scanlist_ie(struct nlattr **bss, struct iwinfo_scanlist_entry *e) { int ielen = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]); unsigned char *ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]); static unsigned char ms_oui[3] = { 0x00, 0x50, 0xf2 }; int len; while (ielen >= 2 && ielen >= ie[1]) { switch (ie[0]) { case 0: /* SSID */ len = min(ie[1], IWINFO_ESSID_MAX_SIZE); memcpy(e->ssid, ie + 2, len); e->ssid[len] = 0; break; case 48: /* RSN */ iwinfo_parse_rsn(&e->crypto, ie + 2, ie[1], IWINFO_CIPHER_CCMP, IWINFO_KMGMT_8021x); break; case 221: /* Vendor */ if (ie[1] >= 4 && !memcmp(ie + 2, ms_oui, 3) && ie[5] == 1) iwinfo_parse_rsn(&e->crypto, ie + 6, ie[1] - 4, IWINFO_CIPHER_TKIP, IWINFO_KMGMT_PSK); break; } ielen -= ie[1] + 2; ie += ie[1] + 2; } } static int nl80211_get_scanlist_cb(struct nl_msg *msg, void *arg) { int8_t rssi; uint16_t caps; struct nl80211_scanlist *sl = arg; struct nlattr **tb = nl80211_parse(msg); struct nlattr *bss[NL80211_BSS_MAX + 1]; static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = { [NL80211_BSS_TSF] = { .type = NLA_U64 }, [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 }, [NL80211_BSS_BSSID] = { }, [NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 }, [NL80211_BSS_CAPABILITY] = { .type = NLA_U16 }, [NL80211_BSS_INFORMATION_ELEMENTS] = { }, [NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 }, [NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 }, [NL80211_BSS_STATUS] = { .type = NLA_U32 }, [NL80211_BSS_SEEN_MS_AGO] = { .type = NLA_U32 }, [NL80211_BSS_BEACON_IES] = { }, }; if (!tb[NL80211_ATTR_BSS] || nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS], bss_policy) || !bss[NL80211_BSS_BSSID]) { return NL_SKIP; } if (bss[NL80211_BSS_CAPABILITY]) caps = nla_get_u16(bss[NL80211_BSS_CAPABILITY]); else caps = 0; memset(sl->e, 0, sizeof(*sl->e)); memcpy(sl->e->mac, nla_data(bss[NL80211_BSS_BSSID]), 6); if (caps & (1<<1)) sl->e->mode = IWINFO_OPMODE_ADHOC; else if (caps & (1<<0)) sl->e->mode = IWINFO_OPMODE_MASTER; else sl->e->mode = IWINFO_OPMODE_MESHPOINT; if (caps & (1<<4)) sl->e->crypto.enabled = 1; if (bss[NL80211_BSS_FREQUENCY]) sl->e->channel = nl80211_freq2channel(nla_get_u32( bss[NL80211_BSS_FREQUENCY])); if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) nl80211_get_scanlist_ie(bss, sl->e); if (bss[NL80211_BSS_SIGNAL_MBM]) { sl->e->signal = (uint8_t)((int32_t)nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]) / 100); rssi = sl->e->signal - 0x100; if (rssi < -110) rssi = -110; else if (rssi > -40) rssi = -40; sl->e->quality = (rssi + 110); sl->e->quality_max = 70; } if (sl->e->crypto.enabled && !sl->e->crypto.wpa_version) { sl->e->crypto.auth_algs = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED; sl->e->crypto.pair_ciphers = IWINFO_CIPHER_WEP40 | IWINFO_CIPHER_WEP104; } sl->e++; sl->len++; return NL_SKIP; } static int nl80211_get_scanlist_nl(const char *ifname, char *buf, int *len) { struct nl80211_msg_conveyor *req; struct nl80211_scanlist sl = { .e = (struct iwinfo_scanlist_entry *)buf }; req = nl80211_msg(ifname, NL80211_CMD_TRIGGER_SCAN, 0); if (req) { nl80211_send(req, NULL, NULL); nl80211_free(req); } nl80211_wait("nl80211", "scan", NL80211_CMD_NEW_SCAN_RESULTS); req = nl80211_msg(ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP); if (req) { nl80211_send(req, nl80211_get_scanlist_cb, &sl); nl80211_free(req); } *len = sl.len * sizeof(struct iwinfo_scanlist_entry); return *len ? 0 : -1; } static int wpasupp_ssid_decode(const char *in, char *out, int outlen) { #define hex(x) \ (((x) >= 'a') ? ((x) - 'a' + 10) : \ (((x) >= 'A') ? ((x) - 'A' + 10) : ((x) - '0'))) int len = 0; while (*in) { if (len + 1 >= outlen) break; switch (*in) { case '\\': in++; switch (*in) { case 'n': out[len++] = '\n'; in++; break; case 'r': out[len++] = '\r'; in++; break; case 't': out[len++] = '\t'; in++; break; case 'e': out[len++] = '\e'; in++; break; case 'x': if (isxdigit(*(in+1)) && isxdigit(*(in+2))) out[len++] = hex(*(in+1)) * 16 + hex(*(in+2)); in += 3; break; default: out[len++] = *in++; break; } break; default: out[len++] = *in++; break; } } if (outlen > len) out[len] = '\0'; return len; } static int nl80211_get_scanlist(const char *ifname, char *buf, int *len) { int freq, rssi, qmax, count, mode; char *res; char ssid[129] = { 0 }; char bssid[18] = { 0 }; char cipher[256] = { 0 }; /* Got a radioX pseudo interface, find some interface on it or create one */ if (!strncmp(ifname, "radio", 5)) { /* Reuse existing interface */ if ((res = nl80211_phy2ifname(ifname)) != NULL) { return nl80211_get_scanlist(res, buf, len); } /* Need to spawn a temporary iface for scanning */ else if ((res = nl80211_ifadd(ifname)) != NULL) { count = nl80211_get_scanlist(res, buf, len); nl80211_ifdel(res); return count; } } struct iwinfo_scanlist_entry *e = (struct iwinfo_scanlist_entry *)buf; /* WPA supplicant */ if ((res = nl80211_wpactl_info(ifname, "SCAN", "CTRL-EVENT-SCAN-RESULTS"))) { if ((res = nl80211_wpactl_info(ifname, "SCAN_RESULTS", NULL))) { nl80211_get_quality_max(ifname, &qmax); count = -1; do { if (res[0] == '<') { /* skip log lines */ goto nextline; } if (count < 0) { /* skip header line */ count++; goto nextline; } if (sscanf(res, "%17s %d %d %255s%*[ \t]%128[^\n]\n", bssid, &freq, &rssi, cipher, ssid) < 5) { /* skip malformed lines */ goto nextline; } /* BSSID */ e->mac[0] = strtol(&bssid[0], NULL, 16); e->mac[1] = strtol(&bssid[3], NULL, 16); e->mac[2] = strtol(&bssid[6], NULL, 16); e->mac[3] = strtol(&bssid[9], NULL, 16); e->mac[4] = strtol(&bssid[12], NULL, 16); e->mac[5] = strtol(&bssid[15], NULL, 16); /* SSID */ wpasupp_ssid_decode(ssid, e->ssid, sizeof(e->ssid)); /* Mode (assume master) */ if (strstr(cipher,"[MESH]")) e->mode = IWINFO_OPMODE_MESHPOINT; else e->mode = IWINFO_OPMODE_MASTER; /* Channel */ e->channel = nl80211_freq2channel(freq); /* Signal */ e->signal = rssi; /* Quality */ if (rssi < 0) { /* The cfg80211 wext compat layer assumes a signal range * of -110 dBm to -40 dBm, the quality value is derived * by adding 110 to the signal level */ if (rssi < -110) rssi = -110; else if (rssi > -40) rssi = -40; e->quality = (rssi + 110); } else { e->quality = rssi; } /* Max. Quality */ e->quality_max = qmax; /* Crypto */ nl80211_get_scancrypto(cipher, &e->crypto); count++; e++; memset(ssid, 0, sizeof(ssid)); memset(bssid, 0, sizeof(bssid)); memset(cipher, 0, sizeof(cipher)); nextline: /* advance to next line */ while( *res && *res++ != '\n' ); } while( *res ); *len = count * sizeof(struct iwinfo_scanlist_entry); return 0; } } /* station / ad-hoc / monitor scan */ else if (!nl80211_get_mode(ifname, &mode) && (mode == IWINFO_OPMODE_ADHOC || mode == IWINFO_OPMODE_MASTER || mode == IWINFO_OPMODE_CLIENT || mode == IWINFO_OPMODE_MONITOR) && iwinfo_ifup(ifname)) { return nl80211_get_scanlist_nl(ifname, buf, len); } /* AP scan */ else { /* Got a temp interface, don't create yet another one */ if (!strncmp(ifname, "tmp.", 4)) { if (!iwinfo_ifup(ifname)) return -1; nl80211_get_scanlist_nl(ifname, buf, len); iwinfo_ifdown(ifname); return 0; } /* Spawn a new scan interface */ else { if (!(res = nl80211_ifadd(ifname))) goto out; iwinfo_ifmac(res); /* if we can take the new interface up, the driver supports an * additional interface and there's no need to tear down the ap */ if (iwinfo_ifup(res)) { nl80211_get_scanlist_nl(res, buf, len); iwinfo_ifdown(res); } /* driver cannot create secondary interface, take down ap * during scan */ else if (iwinfo_ifdown(ifname) && iwinfo_ifup(res)) { nl80211_get_scanlist_nl(res, buf, len); iwinfo_ifdown(res); iwinfo_ifup(ifname); nl80211_hostapd_hup(ifname); } out: nl80211_ifdel(res); return 0; } } return -1; } static int nl80211_get_freqlist_cb(struct nl_msg *msg, void *arg) { int bands_remain, freqs_remain; struct nl80211_array_buf *arr = arg; struct iwinfo_freqlist_entry *e = arr->buf; struct nlattr **attr = nl80211_parse(msg); struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1]; struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1]; struct nlattr *band, *freq; static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = { [NL80211_FREQUENCY_ATTR_FREQ] = { .type = NLA_U32 }, [NL80211_FREQUENCY_ATTR_DISABLED] = { .type = NLA_FLAG }, [NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG }, [NL80211_FREQUENCY_ATTR_NO_IBSS] = { .type = NLA_FLAG }, [NL80211_FREQUENCY_ATTR_RADAR] = { .type = NLA_FLAG }, [NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32 }, }; nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain) { nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band), nla_len(band), NULL); nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS], freqs_remain) { nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX, nla_data(freq), nla_len(freq), NULL); if (!freqs[NL80211_FREQUENCY_ATTR_FREQ] || freqs[NL80211_FREQUENCY_ATTR_DISABLED]) continue; e->mhz = nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]); e->channel = nl80211_freq2channel(e->mhz); e->restricted = ( freqs[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] || freqs[NL80211_FREQUENCY_ATTR_NO_IBSS] || freqs[NL80211_FREQUENCY_ATTR_RADAR] ) ? 1 : 0; e++; arr->count++; } } return NL_SKIP; } static int nl80211_get_freqlist(const char *ifname, char *buf, int *len) { struct nl80211_msg_conveyor *req; struct nl80211_array_buf arr = { .buf = buf, .count = 0 }; req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0); if (req) { nl80211_send(req, nl80211_get_freqlist_cb, &arr); nl80211_free(req); } if (arr.count > 0) { *len = arr.count * sizeof(struct iwinfo_freqlist_entry); return 0; } return -1; } static int nl80211_get_country_cb(struct nl_msg *msg, void *arg) { char *buf = arg; struct nlattr **attr = nl80211_parse(msg); if (attr[NL80211_ATTR_REG_ALPHA2]) memcpy(buf, nla_data(attr[NL80211_ATTR_REG_ALPHA2]), 2); else buf[0] = 0; return NL_SKIP; } static int nl80211_get_country(const char *ifname, char *buf) { int rv = -1; struct nl80211_msg_conveyor *req; req = nl80211_msg(ifname, NL80211_CMD_GET_REG, 0); if (req) { nl80211_send(req, nl80211_get_country_cb, buf); nl80211_free(req); if (buf[0]) rv = 0; } return rv; } static int nl80211_get_countrylist(const char *ifname, char *buf, int *len) { int i, count; struct iwinfo_country_entry *e = (struct iwinfo_country_entry *)buf; const struct iwinfo_iso3166_label *l; for (l = IWINFO_ISO3166_NAMES, count = 0; l->iso3166; l++, e++, count++) { e->iso3166 = l->iso3166; e->ccode[0] = (l->iso3166 / 256); e->ccode[1] = (l->iso3166 % 256); } *len = (count * sizeof(struct iwinfo_country_entry)); return 0; } static int nl80211_get_hwmodelist_cb(struct nl_msg *msg, void *arg) { int *modes = arg; int bands_remain, freqs_remain; uint16_t caps = 0; uint32_t vht_caps = 0; struct nlattr **attr = nl80211_parse(msg); struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1]; struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1]; struct nlattr *band, *freq; *modes = 0; if (attr[NL80211_ATTR_WIPHY_BANDS]) { nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain) { nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band), nla_len(band), NULL); if (bands[NL80211_BAND_ATTR_HT_CAPA]) caps = nla_get_u16(bands[NL80211_BAND_ATTR_HT_CAPA]); /* Treat any nonzero capability as 11n */ if (caps > 0) *modes |= IWINFO_80211_N; if (bands[NL80211_BAND_ATTR_VHT_CAPA]) vht_caps = nla_get_u32(bands[NL80211_BAND_ATTR_VHT_CAPA]); /* Treat any nonzero capability as 11ac */ if (vht_caps > 0) *modes |= IWINFO_80211_AC; nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS], freqs_remain) { nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX, nla_data(freq), nla_len(freq), NULL); if (!freqs[NL80211_FREQUENCY_ATTR_FREQ]) continue; if (nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]) < 2485) { *modes |= IWINFO_80211_B; *modes |= IWINFO_80211_G; } else if (!(*modes & IWINFO_80211_AC)) { *modes |= IWINFO_80211_A; } } } } return NL_SKIP; } static int nl80211_get_hwmodelist(const char *ifname, int *buf) { struct nl80211_msg_conveyor *req; req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0); if (req) { nl80211_send(req, nl80211_get_hwmodelist_cb, buf); nl80211_free(req); } return *buf ? 0 : -1; } static int nl80211_get_ifcomb_cb(struct nl_msg *msg, void *arg) { struct nlattr **attr = nl80211_parse(msg); struct nlattr *comb; int *ret = arg; int comb_rem, limit_rem, mode_rem; *ret = 0; if (!attr[NL80211_ATTR_INTERFACE_COMBINATIONS]) return NL_SKIP; nla_for_each_nested(comb, attr[NL80211_ATTR_INTERFACE_COMBINATIONS], comb_rem) { static struct nla_policy iface_combination_policy[NUM_NL80211_IFACE_COMB] = { [NL80211_IFACE_COMB_LIMITS] = { .type = NLA_NESTED }, [NL80211_IFACE_COMB_MAXNUM] = { .type = NLA_U32 }, }; struct nlattr *tb_comb[NUM_NL80211_IFACE_COMB]; static struct nla_policy iface_limit_policy[NUM_NL80211_IFACE_LIMIT] = { [NL80211_IFACE_LIMIT_TYPES] = { .type = NLA_NESTED }, [NL80211_IFACE_LIMIT_MAX] = { .type = NLA_U32 }, }; struct nlattr *tb_limit[NUM_NL80211_IFACE_LIMIT]; struct nlattr *limit; nla_parse_nested(tb_comb, NL80211_BAND_ATTR_MAX, comb, iface_combination_policy); if (!tb_comb[NL80211_IFACE_COMB_LIMITS]) continue; nla_for_each_nested(limit, tb_comb[NL80211_IFACE_COMB_LIMITS], limit_rem) { struct nlattr *mode; nla_parse_nested(tb_limit, NUM_NL80211_IFACE_LIMIT, limit, iface_limit_policy); if (!tb_limit[NL80211_IFACE_LIMIT_TYPES] || !tb_limit[NL80211_IFACE_LIMIT_MAX]) continue; if (nla_get_u32(tb_limit[NL80211_IFACE_LIMIT_MAX]) < 2) continue; nla_for_each_nested(mode, tb_limit[NL80211_IFACE_LIMIT_TYPES], mode_rem) { if (nla_type(mode) == NL80211_IFTYPE_AP) *ret = 1; } } } return NL_SKIP; } static int nl80211_get_mbssid_support(const char *ifname, int *buf) { struct nl80211_msg_conveyor *req; req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0); if (!req) return -1; nl80211_send(req, nl80211_get_ifcomb_cb, buf); nl80211_free(req); return 0; } static int nl80211_get_hardware_id(const char *ifname, char *buf) { int rv; char *res; /* Got a radioX pseudo interface, find some interface on it or create one */ if (!strncmp(ifname, "radio", 5)) { /* Reuse existing interface */ if ((res = nl80211_phy2ifname(ifname)) != NULL) { rv = wext_ops.hardware_id(res, buf); } /* Need to spawn a temporary iface for finding IDs */ else if ((res = nl80211_ifadd(ifname)) != NULL) { rv = wext_ops.hardware_id(res, buf); nl80211_ifdel(res); } } else { rv = wext_ops.hardware_id(ifname, buf); } /* Failed to obtain hardware IDs, search board config */ if (rv) { rv = iwinfo_hardware_id_from_mtd((struct iwinfo_hardware_id *)buf); } return rv; } static const struct iwinfo_hardware_entry * nl80211_get_hardware_entry(const char *ifname) { struct iwinfo_hardware_id id; if (nl80211_get_hardware_id(ifname, (char *)&id)) return NULL; return iwinfo_hardware(&id); } static int nl80211_get_hardware_name(const char *ifname, char *buf) { const struct iwinfo_hardware_entry *hw; if (!(hw = nl80211_get_hardware_entry(ifname))) sprintf(buf, "Generic MAC80211"); else sprintf(buf, "%s %s", hw->vendor_name, hw->device_name); return 0; } static int nl80211_get_txpower_offset(const char *ifname, int *buf) { const struct iwinfo_hardware_entry *hw; if (!(hw = nl80211_get_hardware_entry(ifname))) return -1; *buf = hw->txpower_offset; return 0; } static int nl80211_get_frequency_offset(const char *ifname, int *buf) { const struct iwinfo_hardware_entry *hw; if (!(hw = nl80211_get_hardware_entry(ifname))) return -1; *buf = hw->frequency_offset; return 0; } const struct iwinfo_ops nl80211_ops = { .name = "nl80211", .probe = nl80211_probe, .channel = nl80211_get_channel, .frequency = nl80211_get_frequency, .frequency_offset = nl80211_get_frequency_offset, .txpower = nl80211_get_txpower, .txpower_offset = nl80211_get_txpower_offset, .bitrate = nl80211_get_bitrate, .signal = nl80211_get_signal, .noise = nl80211_get_noise, .quality = nl80211_get_quality, .quality_max = nl80211_get_quality_max, .mbssid_support = nl80211_get_mbssid_support, .hwmodelist = nl80211_get_hwmodelist, .mode = nl80211_get_mode, .ssid = nl80211_get_ssid, .bssid = nl80211_get_bssid, .country = nl80211_get_country, .hardware_id = nl80211_get_hardware_id, .hardware_name = nl80211_get_hardware_name, .encryption = nl80211_get_encryption, .phyname = nl80211_get_phyname, .assoclist = nl80211_get_assoclist, .txpwrlist = nl80211_get_txpwrlist, .scanlist = nl80211_get_scanlist, .freqlist = nl80211_get_freqlist, .countrylist = nl80211_get_countrylist, .close = nl80211_close };