| /* src/p80211/p80211conv.c |
| * |
| * Ether/802.11 conversions and packet buffer routines |
| * |
| * Copyright (C) 1999 AbsoluteValue Systems, Inc. All Rights Reserved. |
| * -------------------------------------------------------------------- |
| * |
| * linux-wlan |
| * |
| * The contents of this file are subject to the Mozilla Public |
| * License Version 1.1 (the "License"); you may not use this file |
| * except in compliance with the License. You may obtain a copy of |
| * the License at http://www.mozilla.org/MPL/ |
| * |
| * Software distributed under the License is distributed on an "AS |
| * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or |
| * implied. See the License for the specific language governing |
| * rights and limitations under the License. |
| * |
| * Alternatively, the contents of this file may be used under the |
| * terms of the GNU Public License version 2 (the "GPL"), in which |
| * case the provisions of the GPL are applicable instead of the |
| * above. If you wish to allow the use of your version of this file |
| * only under the terms of the GPL and not to allow others to use |
| * your version of this file under the MPL, indicate your decision |
| * by deleting the provisions above and replace them with the notice |
| * and other provisions required by the GPL. If you do not delete |
| * the provisions above, a recipient may use your version of this |
| * file under either the MPL or the GPL. |
| * |
| * -------------------------------------------------------------------- |
| * |
| * Inquiries regarding the linux-wlan Open Source project can be |
| * made directly to: |
| * |
| * AbsoluteValue Systems Inc. |
| * info@linux-wlan.com |
| * http://www.linux-wlan.com |
| * |
| * -------------------------------------------------------------------- |
| * |
| * Portions of the development of this software were funded by |
| * Intersil Corporation as part of PRISM(R) chipset product development. |
| * |
| * -------------------------------------------------------------------- |
| * |
| * This file defines the functions that perform Ethernet to/from |
| * 802.11 frame conversions. |
| * |
| * -------------------------------------------------------------------- |
| * |
| *================================================================ */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/types.h> |
| #include <linux/skbuff.h> |
| #include <linux/slab.h> |
| #include <linux/wireless.h> |
| #include <linux/netdevice.h> |
| #include <linux/etherdevice.h> |
| #include <linux/if_ether.h> |
| #include <linux/byteorder/generic.h> |
| |
| #include <asm/byteorder.h> |
| |
| #include "p80211types.h" |
| #include "p80211hdr.h" |
| #include "p80211conv.h" |
| #include "p80211mgmt.h" |
| #include "p80211msg.h" |
| #include "p80211netdev.h" |
| #include "p80211ioctl.h" |
| #include "p80211req.h" |
| |
| static u8 oui_rfc1042[] = { 0x00, 0x00, 0x00 }; |
| static u8 oui_8021h[] = { 0x00, 0x00, 0xf8 }; |
| |
| /*---------------------------------------------------------------- |
| * p80211pb_ether_to_80211 |
| * |
| * Uses the contents of the ether frame and the etherconv setting |
| * to build the elements of the 802.11 frame. |
| * |
| * We don't actually set |
| * up the frame header here. That's the MAC's job. We're only handling |
| * conversion of DIXII or 802.3+LLC frames to something that works |
| * with 802.11. |
| * |
| * Note -- 802.11 header is NOT part of the skb. Likewise, the 802.11 |
| * FCS is also not present and will need to be added elsewhere. |
| * |
| * Arguments: |
| * ethconv Conversion type to perform |
| * skb skbuff containing the ether frame |
| * p80211_hdr 802.11 header |
| * |
| * Returns: |
| * 0 on success, non-zero otherwise |
| * |
| * Call context: |
| * May be called in interrupt or non-interrupt context |
| ----------------------------------------------------------------*/ |
| int skb_ether_to_p80211(wlandevice_t *wlandev, u32 ethconv, |
| struct sk_buff *skb, union p80211_hdr *p80211_hdr, |
| struct p80211_metawep *p80211_wep) |
| { |
| |
| u16 fc; |
| u16 proto; |
| struct wlan_ethhdr e_hdr; |
| struct wlan_llc *e_llc; |
| struct wlan_snap *e_snap; |
| int foo; |
| |
| memcpy(&e_hdr, skb->data, sizeof(e_hdr)); |
| |
| if (skb->len <= 0) { |
| pr_debug("zero-length skb!\n"); |
| return 1; |
| } |
| |
| if (ethconv == WLAN_ETHCONV_ENCAP) { /* simplest case */ |
| pr_debug("ENCAP len: %d\n", skb->len); |
| /* here, we don't care what kind of ether frm. Just stick it */ |
| /* in the 80211 payload */ |
| /* which is to say, leave the skb alone. */ |
| } else { |
| /* step 1: classify ether frame, DIX or 802.3? */ |
| proto = ntohs(e_hdr.type); |
| if (proto <= 1500) { |
| pr_debug("802.3 len: %d\n", skb->len); |
| /* codes <= 1500 reserved for 802.3 lengths */ |
| /* it's 802.3, pass ether payload unchanged, */ |
| |
| /* trim off ethernet header */ |
| skb_pull(skb, WLAN_ETHHDR_LEN); |
| |
| /* leave off any PAD octets. */ |
| skb_trim(skb, proto); |
| } else { |
| pr_debug("DIXII len: %d\n", skb->len); |
| /* it's DIXII, time for some conversion */ |
| |
| /* trim off ethernet header */ |
| skb_pull(skb, WLAN_ETHHDR_LEN); |
| |
| /* tack on SNAP */ |
| e_snap = |
| (struct wlan_snap *) skb_push(skb, sizeof(struct wlan_snap)); |
| e_snap->type = htons(proto); |
| if (ethconv == WLAN_ETHCONV_8021h |
| && p80211_stt_findproto(proto)) { |
| memcpy(e_snap->oui, oui_8021h, |
| WLAN_IEEE_OUI_LEN); |
| } else { |
| memcpy(e_snap->oui, oui_rfc1042, |
| WLAN_IEEE_OUI_LEN); |
| } |
| |
| /* tack on llc */ |
| e_llc = |
| (struct wlan_llc *) skb_push(skb, sizeof(struct wlan_llc)); |
| e_llc->dsap = 0xAA; /* SNAP, see IEEE 802 */ |
| e_llc->ssap = 0xAA; |
| e_llc->ctl = 0x03; |
| |
| } |
| } |
| |
| /* Set up the 802.11 header */ |
| /* It's a data frame */ |
| fc = cpu_to_le16(WLAN_SET_FC_FTYPE(WLAN_FTYPE_DATA) | |
| WLAN_SET_FC_FSTYPE(WLAN_FSTYPE_DATAONLY)); |
| |
| switch (wlandev->macmode) { |
| case WLAN_MACMODE_IBSS_STA: |
| memcpy(p80211_hdr->a3.a1, &e_hdr.daddr, ETH_ALEN); |
| memcpy(p80211_hdr->a3.a2, wlandev->netdev->dev_addr, ETH_ALEN); |
| memcpy(p80211_hdr->a3.a3, wlandev->bssid, ETH_ALEN); |
| break; |
| case WLAN_MACMODE_ESS_STA: |
| fc |= cpu_to_le16(WLAN_SET_FC_TODS(1)); |
| memcpy(p80211_hdr->a3.a1, wlandev->bssid, ETH_ALEN); |
| memcpy(p80211_hdr->a3.a2, wlandev->netdev->dev_addr, ETH_ALEN); |
| memcpy(p80211_hdr->a3.a3, &e_hdr.daddr, ETH_ALEN); |
| break; |
| case WLAN_MACMODE_ESS_AP: |
| fc |= cpu_to_le16(WLAN_SET_FC_FROMDS(1)); |
| memcpy(p80211_hdr->a3.a1, &e_hdr.daddr, ETH_ALEN); |
| memcpy(p80211_hdr->a3.a2, wlandev->bssid, ETH_ALEN); |
| memcpy(p80211_hdr->a3.a3, &e_hdr.saddr, ETH_ALEN); |
| break; |
| default: |
| printk(KERN_ERR |
| "Error: Converting eth to wlan in unknown mode.\n"); |
| return 1; |
| break; |
| } |
| |
| p80211_wep->data = NULL; |
| |
| if ((wlandev->hostwep & HOSTWEP_PRIVACYINVOKED) |
| && (wlandev->hostwep & HOSTWEP_ENCRYPT)) { |
| /* XXXX need to pick keynum other than default? */ |
| |
| p80211_wep->data = kmalloc(skb->len, GFP_ATOMIC); |
| foo = wep_encrypt(wlandev, skb->data, p80211_wep->data, |
| skb->len, |
| (wlandev->hostwep & HOSTWEP_DEFAULTKEY_MASK), |
| p80211_wep->iv, p80211_wep->icv); |
| if (foo) { |
| printk(KERN_WARNING |
| "Host en-WEP failed, dropping frame (%d).\n", |
| foo); |
| return 2; |
| } |
| fc |= cpu_to_le16(WLAN_SET_FC_ISWEP(1)); |
| } |
| |
| /* skb->nh.raw = skb->data; */ |
| |
| p80211_hdr->a3.fc = fc; |
| p80211_hdr->a3.dur = 0; |
| p80211_hdr->a3.seq = 0; |
| |
| return 0; |
| } |
| |
| /* jkriegl: from orinoco, modified */ |
| static void orinoco_spy_gather(wlandevice_t *wlandev, char *mac, |
| struct p80211_rxmeta *rxmeta) |
| { |
| int i; |
| |
| /* Gather wireless spy statistics: for each packet, compare the |
| * source address with out list, and if match, get the stats... */ |
| |
| for (i = 0; i < wlandev->spy_number; i++) { |
| |
| if (!memcmp(wlandev->spy_address[i], mac, ETH_ALEN)) { |
| memcpy(wlandev->spy_address[i], mac, ETH_ALEN); |
| wlandev->spy_stat[i].level = rxmeta->signal; |
| wlandev->spy_stat[i].noise = rxmeta->noise; |
| wlandev->spy_stat[i].qual = |
| (rxmeta->signal > |
| rxmeta->noise) ? (rxmeta->signal - |
| rxmeta->noise) : 0; |
| wlandev->spy_stat[i].updated = 0x7; |
| } |
| } |
| } |
| |
| /*---------------------------------------------------------------- |
| * p80211pb_80211_to_ether |
| * |
| * Uses the contents of a received 802.11 frame and the etherconv |
| * setting to build an ether frame. |
| * |
| * This function extracts the src and dest address from the 802.11 |
| * frame to use in the construction of the eth frame. |
| * |
| * Arguments: |
| * ethconv Conversion type to perform |
| * skb Packet buffer containing the 802.11 frame |
| * |
| * Returns: |
| * 0 on success, non-zero otherwise |
| * |
| * Call context: |
| * May be called in interrupt or non-interrupt context |
| ----------------------------------------------------------------*/ |
| int skb_p80211_to_ether(wlandevice_t *wlandev, u32 ethconv, |
| struct sk_buff *skb) |
| { |
| netdevice_t *netdev = wlandev->netdev; |
| u16 fc; |
| unsigned int payload_length; |
| unsigned int payload_offset; |
| u8 daddr[WLAN_ETHADDR_LEN]; |
| u8 saddr[WLAN_ETHADDR_LEN]; |
| union p80211_hdr *w_hdr; |
| struct wlan_ethhdr *e_hdr; |
| struct wlan_llc *e_llc; |
| struct wlan_snap *e_snap; |
| |
| int foo; |
| |
| payload_length = skb->len - WLAN_HDR_A3_LEN - WLAN_CRC_LEN; |
| payload_offset = WLAN_HDR_A3_LEN; |
| |
| w_hdr = (union p80211_hdr *) skb->data; |
| |
| /* setup some vars for convenience */ |
| fc = le16_to_cpu(w_hdr->a3.fc); |
| if ((WLAN_GET_FC_TODS(fc) == 0) && (WLAN_GET_FC_FROMDS(fc) == 0)) { |
| memcpy(daddr, w_hdr->a3.a1, WLAN_ETHADDR_LEN); |
| memcpy(saddr, w_hdr->a3.a2, WLAN_ETHADDR_LEN); |
| } else if ((WLAN_GET_FC_TODS(fc) == 0) && (WLAN_GET_FC_FROMDS(fc) == 1)) { |
| memcpy(daddr, w_hdr->a3.a1, WLAN_ETHADDR_LEN); |
| memcpy(saddr, w_hdr->a3.a3, WLAN_ETHADDR_LEN); |
| } else if ((WLAN_GET_FC_TODS(fc) == 1) && (WLAN_GET_FC_FROMDS(fc) == 0)) { |
| memcpy(daddr, w_hdr->a3.a3, WLAN_ETHADDR_LEN); |
| memcpy(saddr, w_hdr->a3.a2, WLAN_ETHADDR_LEN); |
| } else { |
| payload_offset = WLAN_HDR_A4_LEN; |
| if (payload_length < WLAN_HDR_A4_LEN - WLAN_HDR_A3_LEN) { |
| printk(KERN_ERR "A4 frame too short!\n"); |
| return 1; |
| } |
| payload_length -= (WLAN_HDR_A4_LEN - WLAN_HDR_A3_LEN); |
| memcpy(daddr, w_hdr->a4.a3, WLAN_ETHADDR_LEN); |
| memcpy(saddr, w_hdr->a4.a4, WLAN_ETHADDR_LEN); |
| } |
| |
| /* perform de-wep if necessary.. */ |
| if ((wlandev->hostwep & HOSTWEP_PRIVACYINVOKED) && WLAN_GET_FC_ISWEP(fc) |
| && (wlandev->hostwep & HOSTWEP_DECRYPT)) { |
| if (payload_length <= 8) { |
| printk(KERN_ERR "WEP frame too short (%u).\n", |
| skb->len); |
| return 1; |
| } |
| foo = wep_decrypt(wlandev, skb->data + payload_offset + 4, |
| payload_length - 8, -1, |
| skb->data + payload_offset, |
| skb->data + payload_offset + |
| payload_length - 4); |
| if (foo) { |
| /* de-wep failed, drop skb. */ |
| pr_debug("Host de-WEP failed, dropping frame (%d).\n", |
| foo); |
| wlandev->rx.decrypt_err++; |
| return 2; |
| } |
| |
| /* subtract the IV+ICV length off the payload */ |
| payload_length -= 8; |
| /* chop off the IV */ |
| skb_pull(skb, 4); |
| /* chop off the ICV. */ |
| skb_trim(skb, skb->len - 4); |
| |
| wlandev->rx.decrypt++; |
| } |
| |
| e_hdr = (struct wlan_ethhdr *) (skb->data + payload_offset); |
| |
| e_llc = (struct wlan_llc *) (skb->data + payload_offset); |
| e_snap = |
| (struct wlan_snap *) (skb->data + payload_offset + sizeof(struct wlan_llc)); |
| |
| /* Test for the various encodings */ |
| if ((payload_length >= sizeof(struct wlan_ethhdr)) && |
| (e_llc->dsap != 0xaa || e_llc->ssap != 0xaa) && |
| ((memcmp(daddr, e_hdr->daddr, WLAN_ETHADDR_LEN) == 0) || |
| (memcmp(saddr, e_hdr->saddr, WLAN_ETHADDR_LEN) == 0))) { |
| pr_debug("802.3 ENCAP len: %d\n", payload_length); |
| /* 802.3 Encapsulated */ |
| /* Test for an overlength frame */ |
| if (payload_length > (netdev->mtu + WLAN_ETHHDR_LEN)) { |
| /* A bogus length ethfrm has been encap'd. */ |
| /* Is someone trying an oflow attack? */ |
| printk(KERN_ERR "ENCAP frame too large (%d > %d)\n", |
| payload_length, netdev->mtu + WLAN_ETHHDR_LEN); |
| return 1; |
| } |
| |
| /* Chop off the 802.11 header. it's already sane. */ |
| skb_pull(skb, payload_offset); |
| /* chop off the 802.11 CRC */ |
| skb_trim(skb, skb->len - WLAN_CRC_LEN); |
| |
| } else if ((payload_length >= sizeof(struct wlan_llc) + sizeof(struct wlan_snap)) |
| && (e_llc->dsap == 0xaa) && (e_llc->ssap == 0xaa) |
| && (e_llc->ctl == 0x03) |
| && |
| (((memcmp(e_snap->oui, oui_rfc1042, WLAN_IEEE_OUI_LEN) == 0) |
| && (ethconv == WLAN_ETHCONV_8021h) |
| && (p80211_stt_findproto(le16_to_cpu(e_snap->type)))) |
| || (memcmp(e_snap->oui, oui_rfc1042, WLAN_IEEE_OUI_LEN) != |
| 0))) { |
| pr_debug("SNAP+RFC1042 len: %d\n", payload_length); |
| /* it's a SNAP + RFC1042 frame && protocol is in STT */ |
| /* build 802.3 + RFC1042 */ |
| |
| /* Test for an overlength frame */ |
| if (payload_length > netdev->mtu) { |
| /* A bogus length ethfrm has been sent. */ |
| /* Is someone trying an oflow attack? */ |
| printk(KERN_ERR "SNAP frame too large (%d > %d)\n", |
| payload_length, netdev->mtu); |
| return 1; |
| } |
| |
| /* chop 802.11 header from skb. */ |
| skb_pull(skb, payload_offset); |
| |
| /* create 802.3 header at beginning of skb. */ |
| e_hdr = (struct wlan_ethhdr *) skb_push(skb, WLAN_ETHHDR_LEN); |
| memcpy(e_hdr->daddr, daddr, WLAN_ETHADDR_LEN); |
| memcpy(e_hdr->saddr, saddr, WLAN_ETHADDR_LEN); |
| e_hdr->type = htons(payload_length); |
| |
| /* chop off the 802.11 CRC */ |
| skb_trim(skb, skb->len - WLAN_CRC_LEN); |
| |
| } else if ((payload_length >= sizeof(struct wlan_llc) + sizeof(struct wlan_snap)) |
| && (e_llc->dsap == 0xaa) && (e_llc->ssap == 0xaa) |
| && (e_llc->ctl == 0x03)) { |
| pr_debug("802.1h/RFC1042 len: %d\n", payload_length); |
| /* it's an 802.1h frame || (an RFC1042 && protocol is not in STT) */ |
| /* build a DIXII + RFC894 */ |
| |
| /* Test for an overlength frame */ |
| if ((payload_length - sizeof(struct wlan_llc) - sizeof(struct wlan_snap)) |
| > netdev->mtu) { |
| /* A bogus length ethfrm has been sent. */ |
| /* Is someone trying an oflow attack? */ |
| printk(KERN_ERR "DIXII frame too large (%ld > %d)\n", |
| (long int)(payload_length - sizeof(struct wlan_llc) - |
| sizeof(struct wlan_snap)), netdev->mtu); |
| return 1; |
| } |
| |
| /* chop 802.11 header from skb. */ |
| skb_pull(skb, payload_offset); |
| |
| /* chop llc header from skb. */ |
| skb_pull(skb, sizeof(struct wlan_llc)); |
| |
| /* chop snap header from skb. */ |
| skb_pull(skb, sizeof(struct wlan_snap)); |
| |
| /* create 802.3 header at beginning of skb. */ |
| e_hdr = (struct wlan_ethhdr *) skb_push(skb, WLAN_ETHHDR_LEN); |
| e_hdr->type = e_snap->type; |
| memcpy(e_hdr->daddr, daddr, WLAN_ETHADDR_LEN); |
| memcpy(e_hdr->saddr, saddr, WLAN_ETHADDR_LEN); |
| |
| /* chop off the 802.11 CRC */ |
| skb_trim(skb, skb->len - WLAN_CRC_LEN); |
| } else { |
| pr_debug("NON-ENCAP len: %d\n", payload_length); |
| /* any NON-ENCAP */ |
| /* it's a generic 80211+LLC or IPX 'Raw 802.3' */ |
| /* build an 802.3 frame */ |
| /* allocate space and setup hostbuf */ |
| |
| /* Test for an overlength frame */ |
| if (payload_length > netdev->mtu) { |
| /* A bogus length ethfrm has been sent. */ |
| /* Is someone trying an oflow attack? */ |
| printk(KERN_ERR "OTHER frame too large (%d > %d)\n", |
| payload_length, netdev->mtu); |
| return 1; |
| } |
| |
| /* Chop off the 802.11 header. */ |
| skb_pull(skb, payload_offset); |
| |
| /* create 802.3 header at beginning of skb. */ |
| e_hdr = (struct wlan_ethhdr *) skb_push(skb, WLAN_ETHHDR_LEN); |
| memcpy(e_hdr->daddr, daddr, WLAN_ETHADDR_LEN); |
| memcpy(e_hdr->saddr, saddr, WLAN_ETHADDR_LEN); |
| e_hdr->type = htons(payload_length); |
| |
| /* chop off the 802.11 CRC */ |
| skb_trim(skb, skb->len - WLAN_CRC_LEN); |
| |
| } |
| |
| /* |
| * Note that eth_type_trans() expects an skb w/ skb->data pointing |
| * at the MAC header, it then sets the following skb members: |
| * skb->mac_header, |
| * skb->data, and |
| * skb->pkt_type. |
| * It then _returns_ the value that _we're_ supposed to stuff in |
| * skb->protocol. This is nuts. |
| */ |
| skb->protocol = eth_type_trans(skb, netdev); |
| |
| /* jkriegl: process signal and noise as set in hfa384x_int_rx() */ |
| /* jkriegl: only process signal/noise if requested by iwspy */ |
| if (wlandev->spy_number) |
| orinoco_spy_gather(wlandev, eth_hdr(skb)->h_source, |
| P80211SKB_RXMETA(skb)); |
| |
| /* Free the metadata */ |
| p80211skb_rxmeta_detach(skb); |
| |
| return 0; |
| } |
| |
| /*---------------------------------------------------------------- |
| * p80211_stt_findproto |
| * |
| * Searches the 802.1h Selective Translation Table for a given |
| * protocol. |
| * |
| * Arguments: |
| * proto protocl number (in host order) to search for. |
| * |
| * Returns: |
| * 1 - if the table is empty or a match is found. |
| * 0 - if the table is non-empty and a match is not found. |
| * |
| * Call context: |
| * May be called in interrupt or non-interrupt context |
| ----------------------------------------------------------------*/ |
| int p80211_stt_findproto(u16 proto) |
| { |
| /* Always return found for now. This is the behavior used by the */ |
| /* Zoom Win95 driver when 802.1h mode is selected */ |
| /* TODO: If necessary, add an actual search we'll probably |
| need this to match the CMAC's way of doing things. |
| Need to do some testing to confirm. |
| */ |
| |
| if (proto == 0x80f3) /* APPLETALK */ |
| return 1; |
| |
| return 0; |
| } |
| |
| /*---------------------------------------------------------------- |
| * p80211skb_rxmeta_detach |
| * |
| * Disconnects the frmmeta and rxmeta from an skb. |
| * |
| * Arguments: |
| * wlandev The wlandev this skb belongs to. |
| * skb The skb we're attaching to. |
| * |
| * Returns: |
| * 0 on success, non-zero otherwise |
| * |
| * Call context: |
| * May be called in interrupt or non-interrupt context |
| ----------------------------------------------------------------*/ |
| void p80211skb_rxmeta_detach(struct sk_buff *skb) |
| { |
| struct p80211_rxmeta *rxmeta; |
| struct p80211_frmmeta *frmmeta; |
| |
| /* Sanity checks */ |
| if (skb == NULL) { /* bad skb */ |
| pr_debug("Called w/ null skb.\n"); |
| goto exit; |
| } |
| frmmeta = P80211SKB_FRMMETA(skb); |
| if (frmmeta == NULL) { /* no magic */ |
| pr_debug("Called w/ bad frmmeta magic.\n"); |
| goto exit; |
| } |
| rxmeta = frmmeta->rx; |
| if (rxmeta == NULL) { /* bad meta ptr */ |
| pr_debug("Called w/ bad rxmeta ptr.\n"); |
| goto exit; |
| } |
| |
| /* Free rxmeta */ |
| kfree(rxmeta); |
| |
| /* Clear skb->cb */ |
| memset(skb->cb, 0, sizeof(skb->cb)); |
| exit: |
| return; |
| } |
| |
| /*---------------------------------------------------------------- |
| * p80211skb_rxmeta_attach |
| * |
| * Allocates a p80211rxmeta structure, initializes it, and attaches |
| * it to an skb. |
| * |
| * Arguments: |
| * wlandev The wlandev this skb belongs to. |
| * skb The skb we're attaching to. |
| * |
| * Returns: |
| * 0 on success, non-zero otherwise |
| * |
| * Call context: |
| * May be called in interrupt or non-interrupt context |
| ----------------------------------------------------------------*/ |
| int p80211skb_rxmeta_attach(struct wlandevice *wlandev, struct sk_buff *skb) |
| { |
| int result = 0; |
| struct p80211_rxmeta *rxmeta; |
| struct p80211_frmmeta *frmmeta; |
| |
| /* If these already have metadata, we error out! */ |
| if (P80211SKB_RXMETA(skb) != NULL) { |
| printk(KERN_ERR "%s: RXmeta already attached!\n", |
| wlandev->name); |
| result = 0; |
| goto exit; |
| } |
| |
| /* Allocate the rxmeta */ |
| rxmeta = kzalloc(sizeof(struct p80211_rxmeta), GFP_ATOMIC); |
| |
| if (rxmeta == NULL) { |
| printk(KERN_ERR "%s: Failed to allocate rxmeta.\n", |
| wlandev->name); |
| result = 1; |
| goto exit; |
| } |
| |
| /* Initialize the rxmeta */ |
| rxmeta->wlandev = wlandev; |
| rxmeta->hosttime = jiffies; |
| |
| /* Overlay a frmmeta_t onto skb->cb */ |
| memset(skb->cb, 0, sizeof(struct p80211_frmmeta)); |
| frmmeta = (struct p80211_frmmeta *) (skb->cb); |
| frmmeta->magic = P80211_FRMMETA_MAGIC; |
| frmmeta->rx = rxmeta; |
| exit: |
| return result; |
| } |
| |
| /*---------------------------------------------------------------- |
| * p80211skb_free |
| * |
| * Frees an entire p80211skb by checking and freeing the meta struct |
| * and then freeing the skb. |
| * |
| * Arguments: |
| * wlandev The wlandev this skb belongs to. |
| * skb The skb we're attaching to. |
| * |
| * Returns: |
| * 0 on success, non-zero otherwise |
| * |
| * Call context: |
| * May be called in interrupt or non-interrupt context |
| ----------------------------------------------------------------*/ |
| void p80211skb_free(struct wlandevice *wlandev, struct sk_buff *skb) |
| { |
| struct p80211_frmmeta *meta; |
| |
| meta = P80211SKB_FRMMETA(skb); |
| if (meta && meta->rx) |
| p80211skb_rxmeta_detach(skb); |
| else |
| printk(KERN_ERR "Freeing an skb (%p) w/ no frmmeta.\n", skb); |
| dev_kfree_skb(skb); |
| return; |
| } |