diff options
Diffstat (limited to 'drivers/net/wireless/intersil/hostap/hostap_80211_rx.c')
| -rw-r--r-- | drivers/net/wireless/intersil/hostap/hostap_80211_rx.c | 1116 |
1 files changed, 0 insertions, 1116 deletions
diff --git a/drivers/net/wireless/intersil/hostap/hostap_80211_rx.c b/drivers/net/wireless/intersil/hostap/hostap_80211_rx.c deleted file mode 100644 index 61be822f90b5..000000000000 --- a/drivers/net/wireless/intersil/hostap/hostap_80211_rx.c +++ /dev/null @@ -1,1116 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -#include <linux/etherdevice.h> -#include <linux/slab.h> -#include <linux/export.h> -#include <net/lib80211.h> -#include <linux/if_arp.h> - -#include "hostap_80211.h" -#include "hostap.h" -#include "hostap_ap.h" - -/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ -/* Ethernet-II snap header (RFC1042 for most EtherTypes) */ -static unsigned char rfc1042_header[] = -{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; -/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ -static unsigned char bridge_tunnel_header[] = -{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; -/* No encapsulation header if EtherType < 0x600 (=length) */ - -void hostap_dump_rx_80211(const char *name, struct sk_buff *skb, - struct hostap_80211_rx_status *rx_stats) -{ - struct ieee80211_hdr *hdr; - u16 fc; - - hdr = (struct ieee80211_hdr *) skb->data; - - printk(KERN_DEBUG "%s: RX signal=%d noise=%d rate=%d len=%d " - "jiffies=%ld\n", - name, rx_stats->signal, rx_stats->noise, rx_stats->rate, - skb->len, jiffies); - - if (skb->len < 2) - return; - - fc = le16_to_cpu(hdr->frame_control); - printk(KERN_DEBUG " FC=0x%04x (type=%d:%d)%s%s", - fc, (fc & IEEE80211_FCTL_FTYPE) >> 2, - (fc & IEEE80211_FCTL_STYPE) >> 4, - fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "", - fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : ""); - - if (skb->len < IEEE80211_DATA_HDR3_LEN) { - printk("\n"); - return; - } - - printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id), - le16_to_cpu(hdr->seq_ctrl)); - - printk(KERN_DEBUG " A1=%pM", hdr->addr1); - printk(" A2=%pM", hdr->addr2); - printk(" A3=%pM", hdr->addr3); - if (skb->len >= 30) - printk(" A4=%pM", hdr->addr4); - printk("\n"); -} - - -/* Send RX frame to netif with 802.11 (and possible prism) header. - * Called from hardware or software IRQ context. */ -int prism2_rx_80211(struct net_device *dev, struct sk_buff *skb, - struct hostap_80211_rx_status *rx_stats, int type) -{ - struct hostap_interface *iface; - local_info_t *local; - int hdrlen, phdrlen, head_need, tail_need; - u16 fc; - int prism_header, ret; - struct ieee80211_hdr *fhdr; - - iface = netdev_priv(dev); - local = iface->local; - - if (dev->type == ARPHRD_IEEE80211_PRISM) { - if (local->monitor_type == PRISM2_MONITOR_PRISM) { - prism_header = 1; - phdrlen = sizeof(struct linux_wlan_ng_prism_hdr); - } else { /* local->monitor_type == PRISM2_MONITOR_CAPHDR */ - prism_header = 2; - phdrlen = sizeof(struct linux_wlan_ng_cap_hdr); - } - } else if (dev->type == ARPHRD_IEEE80211_RADIOTAP) { - prism_header = 3; - phdrlen = sizeof(struct hostap_radiotap_rx); - } else { - prism_header = 0; - phdrlen = 0; - } - - fhdr = (struct ieee80211_hdr *) skb->data; - fc = le16_to_cpu(fhdr->frame_control); - - if (type == PRISM2_RX_MGMT && (fc & IEEE80211_FCTL_VERS)) { - printk(KERN_DEBUG "%s: dropped management frame with header " - "version %d\n", dev->name, fc & IEEE80211_FCTL_VERS); - dev_kfree_skb_any(skb); - return 0; - } - - hdrlen = hostap_80211_get_hdrlen(fhdr->frame_control); - - /* check if there is enough room for extra data; if not, expand skb - * buffer to be large enough for the changes */ - head_need = phdrlen; - tail_need = 0; -#ifdef PRISM2_ADD_BOGUS_CRC - tail_need += 4; -#endif /* PRISM2_ADD_BOGUS_CRC */ - - head_need -= skb_headroom(skb); - tail_need -= skb_tailroom(skb); - - if (head_need > 0 || tail_need > 0) { - if (pskb_expand_head(skb, head_need > 0 ? head_need : 0, - tail_need > 0 ? tail_need : 0, - GFP_ATOMIC)) { - printk(KERN_DEBUG "%s: prism2_rx_80211 failed to " - "reallocate skb buffer\n", dev->name); - dev_kfree_skb_any(skb); - return 0; - } - } - - /* We now have an skb with enough head and tail room, so just insert - * the extra data */ - -#ifdef PRISM2_ADD_BOGUS_CRC - memset(skb_put(skb, 4), 0xff, 4); /* Prism2 strips CRC */ -#endif /* PRISM2_ADD_BOGUS_CRC */ - - if (prism_header == 1) { - struct linux_wlan_ng_prism_hdr *hdr; - hdr = skb_push(skb, phdrlen); - memset(hdr, 0, phdrlen); - hdr->msgcode = LWNG_CAP_DID_BASE; - hdr->msglen = sizeof(*hdr); - memcpy(hdr->devname, dev->name, sizeof(hdr->devname)); -#define LWNG_SETVAL(f,i,s,l,d) \ -hdr->f.did = LWNG_CAP_DID_BASE | (i << 12); \ -hdr->f.status = s; hdr->f.len = l; hdr->f.data = d - LWNG_SETVAL(hosttime, 1, 0, 4, jiffies); - LWNG_SETVAL(mactime, 2, 0, 4, rx_stats->mac_time); - LWNG_SETVAL(channel, 3, 1 /* no value */, 4, 0); - LWNG_SETVAL(rssi, 4, 1 /* no value */, 4, 0); - LWNG_SETVAL(sq, 5, 1 /* no value */, 4, 0); - LWNG_SETVAL(signal, 6, 0, 4, rx_stats->signal); - LWNG_SETVAL(noise, 7, 0, 4, rx_stats->noise); - LWNG_SETVAL(rate, 8, 0, 4, rx_stats->rate / 5); - LWNG_SETVAL(istx, 9, 0, 4, 0); - LWNG_SETVAL(frmlen, 10, 0, 4, skb->len - phdrlen); -#undef LWNG_SETVAL - } else if (prism_header == 2) { - struct linux_wlan_ng_cap_hdr *hdr; - hdr = skb_push(skb, phdrlen); - memset(hdr, 0, phdrlen); - hdr->version = htonl(LWNG_CAPHDR_VERSION); - hdr->length = htonl(phdrlen); - hdr->mactime = __cpu_to_be64(rx_stats->mac_time); - hdr->hosttime = __cpu_to_be64(jiffies); - hdr->phytype = htonl(4); /* dss_dot11_b */ - hdr->channel = htonl(local->channel); - hdr->datarate = htonl(rx_stats->rate); - hdr->antenna = htonl(0); /* unknown */ - hdr->priority = htonl(0); /* unknown */ - hdr->ssi_type = htonl(3); /* raw */ - hdr->ssi_signal = htonl(rx_stats->signal); - hdr->ssi_noise = htonl(rx_stats->noise); - hdr->preamble = htonl(0); /* unknown */ - hdr->encoding = htonl(1); /* cck */ - } else if (prism_header == 3) { - struct hostap_radiotap_rx *hdr; - hdr = skb_push(skb, phdrlen); - memset(hdr, 0, phdrlen); - hdr->hdr.it_len = cpu_to_le16(phdrlen); - hdr->hdr.it_present = - cpu_to_le32((1 << IEEE80211_RADIOTAP_TSFT) | - (1 << IEEE80211_RADIOTAP_CHANNEL) | - (1 << IEEE80211_RADIOTAP_RATE) | - (1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL) | - (1 << IEEE80211_RADIOTAP_DBM_ANTNOISE)); - hdr->tsft = cpu_to_le64(rx_stats->mac_time); - hdr->chan_freq = cpu_to_le16(freq_list[local->channel - 1]); - hdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_CCK | - IEEE80211_CHAN_2GHZ); - hdr->rate = rx_stats->rate / 5; - hdr->dbm_antsignal = rx_stats->signal; - hdr->dbm_antnoise = rx_stats->noise; - } - - ret = skb->len - phdrlen; - skb->dev = dev; - skb_reset_mac_header(skb); - skb_pull(skb, hdrlen); - if (prism_header) - skb_pull(skb, phdrlen); - skb->pkt_type = PACKET_OTHERHOST; - skb->protocol = cpu_to_be16(ETH_P_802_2); - memset(skb->cb, 0, sizeof(skb->cb)); - netif_rx(skb); - - return ret; -} - - -/* Called only as a tasklet (software IRQ) */ -static void monitor_rx(struct net_device *dev, struct sk_buff *skb, - struct hostap_80211_rx_status *rx_stats) -{ - int len; - - len = prism2_rx_80211(dev, skb, rx_stats, PRISM2_RX_MONITOR); - dev->stats.rx_packets++; - dev->stats.rx_bytes += len; -} - - -/* Called only as a tasklet (software IRQ) */ -static struct prism2_frag_entry * -prism2_frag_cache_find(local_info_t *local, unsigned int seq, - unsigned int frag, u8 *src, u8 *dst) -{ - struct prism2_frag_entry *entry; - int i; - - for (i = 0; i < PRISM2_FRAG_CACHE_LEN; i++) { - entry = &local->frag_cache[i]; - if (entry->skb != NULL && - time_after(jiffies, entry->first_frag_time + 2 * HZ)) { - printk(KERN_DEBUG "%s: expiring fragment cache entry " - "seq=%u last_frag=%u\n", - local->dev->name, entry->seq, entry->last_frag); - dev_kfree_skb(entry->skb); - entry->skb = NULL; - } - - if (entry->skb != NULL && entry->seq == seq && - (entry->last_frag + 1 == frag || frag == -1) && - memcmp(entry->src_addr, src, ETH_ALEN) == 0 && - memcmp(entry->dst_addr, dst, ETH_ALEN) == 0) - return entry; - } - - return NULL; -} - - -/* Called only as a tasklet (software IRQ) */ -static struct sk_buff * -prism2_frag_cache_get(local_info_t *local, struct ieee80211_hdr *hdr) -{ - struct sk_buff *skb = NULL; - u16 sc; - unsigned int frag, seq; - struct prism2_frag_entry *entry; - - sc = le16_to_cpu(hdr->seq_ctrl); - frag = sc & IEEE80211_SCTL_FRAG; - seq = (sc & IEEE80211_SCTL_SEQ) >> 4; - - if (frag == 0) { - /* Reserve enough space to fit maximum frame length */ - skb = dev_alloc_skb(local->dev->mtu + - sizeof(struct ieee80211_hdr) + - 8 /* LLC */ + - 2 /* alignment */ + - 8 /* WEP */ + ETH_ALEN /* WDS */); - if (skb == NULL) - return NULL; - - entry = &local->frag_cache[local->frag_next_idx]; - local->frag_next_idx++; - if (local->frag_next_idx >= PRISM2_FRAG_CACHE_LEN) - local->frag_next_idx = 0; - - if (entry->skb != NULL) - dev_kfree_skb(entry->skb); - - entry->first_frag_time = jiffies; - entry->seq = seq; - entry->last_frag = frag; - entry->skb = skb; - memcpy(entry->src_addr, hdr->addr2, ETH_ALEN); - memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN); - } else { - /* received a fragment of a frame for which the head fragment - * should have already been received */ - entry = prism2_frag_cache_find(local, seq, frag, hdr->addr2, - hdr->addr1); - if (entry != NULL) { - entry->last_frag = frag; - skb = entry->skb; - } - } - - return skb; -} - - -/* Called only as a tasklet (software IRQ) */ -static int prism2_frag_cache_invalidate(local_info_t *local, - struct ieee80211_hdr *hdr) -{ - u16 sc; - unsigned int seq; - struct prism2_frag_entry *entry; - - sc = le16_to_cpu(hdr->seq_ctrl); - seq = (sc & IEEE80211_SCTL_SEQ) >> 4; - - entry = prism2_frag_cache_find(local, seq, -1, hdr->addr2, hdr->addr1); - - if (entry == NULL) { - printk(KERN_DEBUG "%s: could not invalidate fragment cache " - "entry (seq=%u)\n", - local->dev->name, seq); - return -1; - } - - entry->skb = NULL; - return 0; -} - - -static struct hostap_bss_info *__hostap_get_bss(local_info_t *local, u8 *bssid, - u8 *ssid, size_t ssid_len) -{ - struct list_head *ptr; - struct hostap_bss_info *bss; - - list_for_each(ptr, &local->bss_list) { - bss = list_entry(ptr, struct hostap_bss_info, list); - if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0 && - (ssid == NULL || - (ssid_len == bss->ssid_len && - memcmp(ssid, bss->ssid, ssid_len) == 0))) { - list_move(&bss->list, &local->bss_list); - return bss; - } - } - - return NULL; -} - - -static struct hostap_bss_info *__hostap_add_bss(local_info_t *local, u8 *bssid, - u8 *ssid, size_t ssid_len) -{ - struct hostap_bss_info *bss; - - if (local->num_bss_info >= HOSTAP_MAX_BSS_COUNT) { - bss = list_entry(local->bss_list.prev, - struct hostap_bss_info, list); - list_del(&bss->list); - local->num_bss_info--; - } else { - bss = kmalloc(sizeof(*bss), GFP_ATOMIC); - if (bss == NULL) - return NULL; - } - - memset(bss, 0, sizeof(*bss)); - memcpy(bss->bssid, bssid, ETH_ALEN); - memcpy(bss->ssid, ssid, ssid_len); - bss->ssid_len = ssid_len; - local->num_bss_info++; - list_add(&bss->list, &local->bss_list); - return bss; -} - - -static void __hostap_expire_bss(local_info_t *local) -{ - struct hostap_bss_info *bss; - - while (local->num_bss_info > 0) { - bss = list_entry(local->bss_list.prev, - struct hostap_bss_info, list); - if (!time_after(jiffies, bss->last_update + 60 * HZ)) - break; - - list_del(&bss->list); - local->num_bss_info--; - kfree(bss); - } -} - - -/* Both IEEE 802.11 Beacon and Probe Response frames have similar structure, so - * the same routine can be used to parse both of them. */ -static void hostap_rx_sta_beacon(local_info_t *local, struct sk_buff *skb, - int stype) -{ - struct hostap_ieee80211_mgmt *mgmt; - int left, chan = 0; - u8 *pos; - u8 *ssid = NULL, *wpa = NULL, *rsn = NULL; - size_t ssid_len = 0, wpa_len = 0, rsn_len = 0; - struct hostap_bss_info *bss; - - if (skb->len < IEEE80211_MGMT_HDR_LEN + sizeof(mgmt->u.beacon)) - return; - - mgmt = (struct hostap_ieee80211_mgmt *) skb->data; - pos = mgmt->u.beacon.variable; - left = skb->len - (pos - skb->data); - - while (left >= 2) { - if (2 + pos[1] > left) - return; /* parse failed */ - switch (*pos) { - case WLAN_EID_SSID: - ssid = pos + 2; - ssid_len = pos[1]; - break; - case WLAN_EID_VENDOR_SPECIFIC: - if (pos[1] >= 4 && - pos[2] == 0x00 && pos[3] == 0x50 && - pos[4] == 0xf2 && pos[5] == 1) { - wpa = pos; - wpa_len = pos[1] + 2; - } - break; - case WLAN_EID_RSN: - rsn = pos; - rsn_len = pos[1] + 2; - break; - case WLAN_EID_DS_PARAMS: - if (pos[1] >= 1) - chan = pos[2]; - break; - } - left -= 2 + pos[1]; - pos += 2 + pos[1]; - } - - if (wpa_len > MAX_WPA_IE_LEN) - wpa_len = MAX_WPA_IE_LEN; - if (rsn_len > MAX_WPA_IE_LEN) - rsn_len = MAX_WPA_IE_LEN; - if (ssid_len > sizeof(bss->ssid)) - ssid_len = sizeof(bss->ssid); - - spin_lock(&local->lock); - bss = __hostap_get_bss(local, mgmt->bssid, ssid, ssid_len); - if (bss == NULL) - bss = __hostap_add_bss(local, mgmt->bssid, ssid, ssid_len); - if (bss) { - bss->last_update = jiffies; - bss->count++; - bss->capab_info = le16_to_cpu(mgmt->u.beacon.capab_info); - if (wpa) { - memcpy(bss->wpa_ie, wpa, wpa_len); - bss->wpa_ie_len = wpa_len; - } else - bss->wpa_ie_len = 0; - if (rsn) { - memcpy(bss->rsn_ie, rsn, rsn_len); - bss->rsn_ie_len = rsn_len; - } else - bss->rsn_ie_len = 0; - bss->chan = chan; - } - __hostap_expire_bss(local); - spin_unlock(&local->lock); -} - - -static int -hostap_rx_frame_mgmt(local_info_t *local, struct sk_buff *skb, - struct hostap_80211_rx_status *rx_stats, u16 type, - u16 stype) -{ - if (local->iw_mode == IW_MODE_MASTER) - hostap_update_sta_ps(local, (struct ieee80211_hdr *) skb->data); - - if (local->hostapd && type == IEEE80211_FTYPE_MGMT) { - if (stype == IEEE80211_STYPE_BEACON && - local->iw_mode == IW_MODE_MASTER) { - struct sk_buff *skb2; - /* Process beacon frames also in kernel driver to - * update STA(AP) table statistics */ - skb2 = skb_clone(skb, GFP_ATOMIC); - if (skb2) - hostap_rx(skb2->dev, skb2, rx_stats); - } - - /* send management frames to the user space daemon for - * processing */ - local->apdevstats.rx_packets++; - local->apdevstats.rx_bytes += skb->len; - if (local->apdev == NULL) - return -1; - prism2_rx_80211(local->apdev, skb, rx_stats, PRISM2_RX_MGMT); - return 0; - } - - if (local->iw_mode == IW_MODE_MASTER) { - if (type != IEEE80211_FTYPE_MGMT && - type != IEEE80211_FTYPE_CTL) { - printk(KERN_DEBUG "%s: unknown management frame " - "(type=0x%02x, stype=0x%02x) dropped\n", - skb->dev->name, type >> 2, stype >> 4); - return -1; - } - - hostap_rx(skb->dev, skb, rx_stats); - return 0; - } else if (type == IEEE80211_FTYPE_MGMT && - (stype == IEEE80211_STYPE_BEACON || - stype == IEEE80211_STYPE_PROBE_RESP)) { - hostap_rx_sta_beacon(local, skb, stype); - return -1; - } else if (type == IEEE80211_FTYPE_MGMT && - (stype == IEEE80211_STYPE_ASSOC_RESP || - stype == IEEE80211_STYPE_REASSOC_RESP)) { - /* Ignore (Re)AssocResp silently since these are not currently - * needed but are still received when WPA/RSN mode is enabled. - */ - return -1; - } else { - printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: dropped unhandled" - " management frame in non-Host AP mode (type=%d:%d)\n", - skb->dev->name, type >> 2, stype >> 4); - return -1; - } -} - - -/* Called only as a tasklet (software IRQ) */ -static struct net_device *prism2_rx_get_wds(local_info_t *local, - u8 *addr) -{ - struct hostap_interface *iface = NULL; - struct list_head *ptr; - - read_lock_bh(&local->iface_lock); - list_for_each(ptr, &local->hostap_interfaces) { - iface = list_entry(ptr, struct hostap_interface, list); - if (iface->type == HOSTAP_INTERFACE_WDS && - memcmp(iface->u.wds.remote_addr, addr, ETH_ALEN) == 0) - break; - iface = NULL; - } - read_unlock_bh(&local->iface_lock); - - return iface ? iface->dev : NULL; -} - - -static int -hostap_rx_frame_wds(local_info_t *local, struct ieee80211_hdr *hdr, u16 fc, - struct net_device **wds) -{ - /* FIX: is this really supposed to accept WDS frames only in Master - * mode? What about Repeater or Managed with WDS frames? */ - if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) != - (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS) && - (local->iw_mode != IW_MODE_MASTER || !(fc & IEEE80211_FCTL_TODS))) - return 0; /* not a WDS frame */ - - /* Possible WDS frame: either IEEE 802.11 compliant (if FromDS) - * or own non-standard frame with 4th address after payload */ - if (!ether_addr_equal(hdr->addr1, local->dev->dev_addr) && - (hdr->addr1[0] != 0xff || hdr->addr1[1] != 0xff || - hdr->addr1[2] != 0xff || hdr->addr1[3] != 0xff || - hdr->addr1[4] != 0xff || hdr->addr1[5] != 0xff)) { - /* RA (or BSSID) is not ours - drop */ - PDEBUG(DEBUG_EXTRA2, "%s: received WDS frame with " - "not own or broadcast %s=%pM\n", - local->dev->name, - fc & IEEE80211_FCTL_FROMDS ? "RA" : "BSSID", - hdr->addr1); - return -1; - } - - /* check if the frame came from a registered WDS connection */ - *wds = prism2_rx_get_wds(local, hdr->addr2); - if (*wds == NULL && fc & IEEE80211_FCTL_FROMDS && - (local->iw_mode != IW_MODE_INFRA || - !(local->wds_type & HOSTAP_WDS_AP_CLIENT) || - memcmp(hdr->addr2, local->bssid, ETH_ALEN) != 0)) { - /* require that WDS link has been registered with TA or the - * frame is from current AP when using 'AP client mode' */ - PDEBUG(DEBUG_EXTRA, "%s: received WDS[4 addr] frame " - "from unknown TA=%pM\n", - local->dev->name, hdr->addr2); - if (local->ap && local->ap->autom_ap_wds) - hostap_wds_link_oper(local, hdr->addr2, WDS_ADD); - return -1; - } - - if (*wds && !(fc & IEEE80211_FCTL_FROMDS) && local->ap && - hostap_is_sta_assoc(local->ap, hdr->addr2)) { - /* STA is actually associated with us even though it has a - * registered WDS link. Assume it is in 'AP client' mode. - * Since this is a 3-addr frame, assume it is not (bogus) WDS - * frame and process it like any normal ToDS frame from - * associated STA. */ - *wds = NULL; - } - - return 0; -} - - -static int hostap_is_eapol_frame(local_info_t *local, struct sk_buff *skb) -{ - struct net_device *dev = local->dev; - u16 fc, ethertype; - struct ieee80211_hdr *hdr; - u8 *pos; - - if (skb->len < 24) - return 0; - - hdr = (struct ieee80211_hdr *) skb->data; - fc = le16_to_cpu(hdr->frame_control); - - /* check that the frame is unicast frame to us */ - if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == - IEEE80211_FCTL_TODS && - ether_addr_equal(hdr->addr1, dev->dev_addr) && - ether_addr_equal(hdr->addr3, dev->dev_addr)) { - /* ToDS frame with own addr BSSID and DA */ - } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == - IEEE80211_FCTL_FROMDS && - ether_addr_equal(hdr->addr1, dev->dev_addr)) { - /* FromDS frame with own addr as DA */ - } else - return 0; - - if (skb->len < 24 + 8) - return 0; - - /* check for port access entity Ethernet type */ - pos = skb->data + 24; - ethertype = (pos[6] << 8) | pos[7]; - if (ethertype == ETH_P_PAE) - return 1; - - return 0; -} - - -/* Called only as a tasklet (software IRQ) */ -static int -hostap_rx_frame_decrypt(local_info_t *local, struct sk_buff *skb, - struct lib80211_crypt_data *crypt) -{ - struct ieee80211_hdr *hdr; - int res, hdrlen; - - if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL) - return 0; - - hdr = (struct ieee80211_hdr *) skb->data; - hdrlen = hostap_80211_get_hdrlen(hdr->frame_control); - - if (local->tkip_countermeasures && - strcmp(crypt->ops->name, "TKIP") == 0) { - if (net_ratelimit()) { - printk(KERN_DEBUG "%s: TKIP countermeasures: dropped " - "received packet from %pM\n", - local->dev->name, hdr->addr2); - } - return -1; - } - - atomic_inc(&crypt->refcnt); - res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv); - atomic_dec(&crypt->refcnt); - if (res < 0) { - printk(KERN_DEBUG "%s: decryption failed (SA=%pM) res=%d\n", - local->dev->name, hdr->addr2, res); - local->comm_tallies.rx_discards_wep_undecryptable++; - return -1; - } - - return res; -} - - -/* Called only as a tasklet (software IRQ) */ -static int -hostap_rx_frame_decrypt_msdu(local_info_t *local, struct sk_buff *skb, - int keyidx, struct lib80211_crypt_data *crypt) -{ - struct ieee80211_hdr *hdr; - int res, hdrlen; - - if (crypt == NULL || crypt->ops->decrypt_msdu == NULL) - return 0; - - hdr = (struct ieee80211_hdr *) skb->data; - hdrlen = hostap_80211_get_hdrlen(hdr->frame_control); - - atomic_inc(&crypt->refcnt); - res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv); - atomic_dec(&crypt->refcnt); - if (res < 0) { - printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed" - " (SA=%pM keyidx=%d)\n", - local->dev->name, hdr->addr2, keyidx); - return -1; - } - - return 0; -} - - -/* All received frames are sent to this function. @skb contains the frame in - * IEEE 802.11 format, i.e., in the format it was sent over air. - * This function is called only as a tasklet (software IRQ). */ -void hostap_80211_rx(struct net_device *dev, struct sk_buff *skb, - struct hostap_80211_rx_status *rx_stats) -{ - struct hostap_interface *iface; - local_info_t *local; - struct ieee80211_hdr *hdr; - size_t hdrlen; - u16 fc, type, stype, sc; - struct net_device *wds = NULL; - unsigned int frag; - u8 *payload; - struct sk_buff *skb2 = NULL; - u16 ethertype; - int frame_authorized = 0; - int from_assoc_ap = 0; - u8 dst[ETH_ALEN]; - u8 src[ETH_ALEN]; - struct lib80211_crypt_data *crypt = NULL; - void *sta = NULL; - int keyidx = 0; - - iface = netdev_priv(dev); - local = iface->local; - iface->stats.rx_packets++; - iface->stats.rx_bytes += skb->len; - - /* dev is the master radio device; change this to be the default - * virtual interface (this may be changed to WDS device below) */ - dev = local->ddev; - iface = netdev_priv(dev); - - hdr = (struct ieee80211_hdr *) skb->data; - - if (skb->len < 10) - goto rx_dropped; - - fc = le16_to_cpu(hdr->frame_control); - type = fc & IEEE80211_FCTL_FTYPE; - stype = fc & IEEE80211_FCTL_STYPE; - sc = le16_to_cpu(hdr->seq_ctrl); - frag = sc & IEEE80211_SCTL_FRAG; - hdrlen = hostap_80211_get_hdrlen(hdr->frame_control); - - /* Put this code here so that we avoid duplicating it in all - * Rx paths. - Jean II */ -#ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */ - /* If spy monitoring on */ - if (iface->spy_data.spy_number > 0) { - struct iw_quality wstats; - wstats.level = rx_stats->signal; - wstats.noise = rx_stats->noise; - wstats.updated = IW_QUAL_LEVEL_UPDATED | IW_QUAL_NOISE_UPDATED - | IW_QUAL_QUAL_INVALID | IW_QUAL_DBM; - /* Update spy records */ - wireless_spy_update(dev, hdr->addr2, &wstats); - } -#endif /* IW_WIRELESS_SPY */ - hostap_update_rx_stats(local->ap, hdr, rx_stats); - - if (local->iw_mode == IW_MODE_MONITOR) { - monitor_rx(dev, skb, rx_stats); - return; - } - - if (local->host_decrypt) { - int idx = 0; - if (skb->len >= hdrlen + 3) - idx = skb->data[hdrlen + 3] >> 6; - crypt = local->crypt_info.crypt[idx]; - sta = NULL; - - /* Use station specific key to override default keys if the - * receiver address is a unicast address ("individual RA"). If - * bcrx_sta_key parameter is set, station specific key is used - * even with broad/multicast targets (this is against IEEE - * 802.11, but makes it easier to use different keys with - * stations that do not support WEP key mapping). */ - - if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key) - (void) hostap_handle_sta_crypto(local, hdr, &crypt, - &sta); - - /* allow NULL decrypt to indicate an station specific override - * for default encryption */ - if (crypt && (crypt->ops == NULL || - crypt->ops->decrypt_mpdu == NULL)) - crypt = NULL; - - if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) { -#if 0 - /* This seems to be triggered by some (multicast?) - * frames from other than current BSS, so just drop the - * frames silently instead of filling system log with - * these reports. */ - printk(KERN_DEBUG "%s: WEP decryption failed (not set)" - " (SA=%pM)\n", - local->dev->name, hdr->addr2); -#endif - local->comm_tallies.rx_discards_wep_undecryptable++; - goto rx_dropped; - } - } - - if (type != IEEE80211_FTYPE_DATA) { - if (type == IEEE80211_FTYPE_MGMT && - stype == IEEE80211_STYPE_AUTH && - fc & IEEE80211_FCTL_PROTECTED && local->host_decrypt && - (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0) - { - printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth " - "from %pM\n", dev->name, hdr->addr2); - /* TODO: could inform hostapd about this so that it - * could send auth failure report */ - goto rx_dropped; - } - - if (hostap_rx_frame_mgmt(local, skb, rx_stats, type, stype)) - goto rx_dropped; - else - goto rx_exit; - } - - /* Data frame - extract src/dst addresses */ - if (skb->len < IEEE80211_DATA_HDR3_LEN) - goto rx_dropped; - - switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { - case IEEE80211_FCTL_FROMDS: - memcpy(dst, hdr->addr1, ETH_ALEN); - memcpy(src, hdr->addr3, ETH_ALEN); - break; - case IEEE80211_FCTL_TODS: - memcpy(dst, hdr->addr3, ETH_ALEN); - memcpy(src, hdr->addr2, ETH_ALEN); - break; - case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS: - if (skb->len < IEEE80211_DATA_HDR4_LEN) - goto rx_dropped; - memcpy(dst, hdr->addr3, ETH_ALEN); - memcpy(src, hdr->addr4, ETH_ALEN); - break; - default: - memcpy(dst, hdr->addr1, ETH_ALEN); - memcpy(src, hdr->addr2, ETH_ALEN); - break; - } - - if (hostap_rx_frame_wds(local, hdr, fc, &wds)) - goto rx_dropped; - if (wds) - skb->dev = dev = wds; - - if (local->iw_mode == IW_MODE_MASTER && !wds && - (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == - IEEE80211_FCTL_FROMDS && - local->stadev && - memcmp(hdr->addr2, local->assoc_ap_addr, ETH_ALEN) == 0) { - /* Frame from BSSID of the AP for which we are a client */ - skb->dev = dev = local->stadev; - from_assoc_ap = 1; - } - - if ((local->iw_mode == IW_MODE_MASTER || - local->iw_mode == IW_MODE_REPEAT) && - !from_assoc_ap) { - switch (hostap_handle_sta_rx(local, dev, skb, rx_stats, - wds != NULL)) { - case AP_RX_CONTINUE_NOT_AUTHORIZED: - frame_authorized = 0; - break; - case AP_RX_CONTINUE: - frame_authorized = 1; - break; - case AP_RX_DROP: - goto rx_dropped; - case AP_RX_EXIT: - goto rx_exit; - } - } - - /* Nullfunc frames may have PS-bit set, so they must be passed to - * hostap_handle_sta_rx() before being dropped here. */ - if (stype != IEEE80211_STYPE_DATA && - stype != IEEE80211_STYPE_DATA_CFACK && - stype != IEEE80211_STYPE_DATA_CFPOLL && - stype != IEEE80211_STYPE_DATA_CFACKPOLL) { - if (stype != IEEE80211_STYPE_NULLFUNC) - printk(KERN_DEBUG "%s: RX: dropped data frame " - "with no data (type=0x%02x, subtype=0x%02x)\n", - dev->name, type >> 2, stype >> 4); - goto rx_dropped; - } - - /* skb: hdr + (possibly fragmented, possibly encrypted) payload */ - - if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && - (keyidx = hostap_rx_frame_decrypt(local, skb, crypt)) < 0) - goto rx_dropped; - hdr = (struct ieee80211_hdr *) skb->data; - - /* skb: hdr + (possibly fragmented) plaintext payload */ - - if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && - (frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) { - int flen; - struct sk_buff *frag_skb = - prism2_frag_cache_get(local, hdr); - if (!frag_skb) { - printk(KERN_DEBUG "%s: Rx cannot get skb from " - "fragment cache (morefrag=%d seq=%u frag=%u)\n", - dev->name, (fc & IEEE80211_FCTL_MOREFRAGS) != 0, - (sc & IEEE80211_SCTL_SEQ) >> 4, frag); - goto rx_dropped; - } - - flen = skb->len; - if (frag != 0) - flen -= hdrlen; - - if (frag_skb->tail + flen > frag_skb->end) { - printk(KERN_WARNING "%s: host decrypted and " - "reassembled frame did not fit skb\n", - dev->name); - prism2_frag_cache_invalidate(local, hdr); - goto rx_dropped; - } - - if (frag == 0) { - /* copy first fragment (including full headers) into - * beginning of the fragment cache skb */ - skb_copy_from_linear_data(skb, skb_put(frag_skb, flen), - flen); - } else { - /* append frame payload to the end of the fragment - * cache skb */ - skb_copy_from_linear_data_offset(skb, hdrlen, - skb_put(frag_skb, - flen), flen); - } - dev_kfree_skb(skb); - skb = NULL; - - if (fc & IEEE80211_FCTL_MOREFRAGS) { - /* more fragments expected - leave the skb in fragment - * cache for now; it will be delivered to upper layers - * after all fragments have been received */ - goto rx_exit; - } - - /* this was the last fragment and the frame will be - * delivered, so remove skb from fragment cache */ - skb = frag_skb; - hdr = (struct ieee80211_hdr *) skb->data; - prism2_frag_cache_invalidate(local, hdr); - } - - /* skb: hdr + (possible reassembled) full MSDU payload; possibly still - * encrypted/authenticated */ - - if (local->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) && - hostap_rx_frame_decrypt_msdu(local, skb, keyidx, crypt)) - goto rx_dropped; - - hdr = (struct ieee80211_hdr *) skb->data; - if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !local->open_wep) { - if (local->ieee_802_1x && - hostap_is_eapol_frame(local, skb)) { - /* pass unencrypted EAPOL frames even if encryption is - * configured */ - PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X - passing " - "unencrypted EAPOL frame\n", local->dev->name); - } else { - printk(KERN_DEBUG "%s: encryption configured, but RX " - "frame not encrypted (SA=%pM)\n", - local->dev->name, hdr->addr2); - goto rx_dropped; - } - } - - if (local->drop_unencrypted && !(fc & IEEE80211_FCTL_PROTECTED) && - !hostap_is_eapol_frame(local, skb)) { - if (net_ratelimit()) { - printk(KERN_DEBUG "%s: dropped unencrypted RX data " - "frame from %pM (drop_unencrypted=1)\n", - dev->name, hdr->addr2); - } - goto rx_dropped; - } - - /* skb: hdr + (possible reassembled) full plaintext payload */ - - payload = skb->data + hdrlen; - ethertype = (payload[6] << 8) | payload[7]; - - /* If IEEE 802.1X is used, check whether the port is authorized to send - * the received frame. */ - if (local->ieee_802_1x && local->iw_mode == IW_MODE_MASTER) { - if (ethertype == ETH_P_PAE) { - PDEBUG(DEBUG_EXTRA2, "%s: RX: IEEE 802.1X frame\n", - dev->name); - if (local->hostapd && local->apdev) { - /* Send IEEE 802.1X frames to the user - * space daemon for processing */ - prism2_rx_80211(local->apdev, skb, rx_stats, - PRISM2_RX_MGMT); - local->apdevstats.rx_packets++; - local->apdevstats.rx_bytes += skb->len; - goto rx_exit; - } - } else if (!frame_authorized) { - printk(KERN_DEBUG "%s: dropped frame from " - "unauthorized port (IEEE 802.1X): " - "ethertype=0x%04x\n", - dev->name, ethertype); - goto rx_dropped; - } - } - - /* convert hdr + possible LLC headers into Ethernet header */ - if (skb->len - hdrlen >= 8 && - ((memcmp(payload, rfc1042_header, 6) == 0 && - ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || - memcmp(payload, bridge_tunnel_header, 6) == 0)) { - /* remove RFC1042 or Bridge-Tunnel encapsulation and - * replace EtherType */ - skb_pull(skb, hdrlen + 6); - memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); - memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); - } else { - __be16 len; - /* Leave Ethernet header part of hdr and full payload */ - skb_pull(skb, hdrlen); - len = htons(skb->len); - memcpy(skb_push(skb, 2), &len, 2); - memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); - memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); - } - - if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == - IEEE80211_FCTL_TODS) && - skb->len >= ETH_HLEN + ETH_ALEN) { - /* Non-standard frame: get addr4 from its bogus location after - * the payload */ - skb_copy_from_linear_data_offset(skb, skb->len - ETH_ALEN, - skb->data + ETH_ALEN, - ETH_ALEN); - skb_trim(skb, skb->len - ETH_ALEN); - } - - dev->stats.rx_packets++; - dev->stats.rx_bytes += skb->len; - - if (local->iw_mode == IW_MODE_MASTER && !wds && - local->ap->bridge_packets) { - if (dst[0] & 0x01) { - /* copy multicast frame both to the higher layers and - * to the wireless media */ - local->ap->bridged_multicast++; - skb2 = skb_clone(skb, GFP_ATOMIC); - if (skb2 == NULL) - printk(KERN_DEBUG "%s: skb_clone failed for " - "multicast frame\n", dev->name); - } else if (hostap_is_sta_authorized(local->ap, dst)) { - /* send frame directly to the associated STA using - * wireless media and not passing to higher layers */ - local->ap->bridged_unicast++; - skb2 = skb; - skb = NULL; - } - } - - if (skb2 != NULL) { - /* send to wireless media */ - skb2->dev = dev; - skb2->protocol = cpu_to_be16(ETH_P_802_3); - skb_reset_mac_header(skb2); - skb_reset_network_header(skb2); - /* skb2->network_header += ETH_HLEN; */ - dev_queue_xmit(skb2); - } - - if (skb) { - skb->protocol = eth_type_trans(skb, dev); - memset(skb->cb, 0, sizeof(skb->cb)); - netif_rx(skb); - } - - rx_exit: - if (sta) - hostap_handle_sta_release(sta); - return; - - rx_dropped: - dev_kfree_skb(skb); - - dev->stats.rx_dropped++; - goto rx_exit; -} - - -EXPORT_SYMBOL(hostap_80211_rx); |