freebsd-skq/sys/net80211/ieee80211_superg.c
Sam Leffler 4207227c6a Fix enough bits so that fast frames work again:
o include ath ie in beacon frames
o fix probe response check for including ath ie
o add ieee80211_add_athcap shorthand for ap-side ie additions
2009-03-26 19:13:11 +00:00

526 lines
15 KiB
C

/*-
* Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/endian.h>
#include <sys/socket.h>
#include <net/bpf.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_llc.h>
#include <net/if_media.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_input.h>
#include <net80211/ieee80211_phy.h>
#include <net80211/ieee80211_superg.h>
#define ETHER_HEADER_COPY(dst, src) \
memcpy(dst, src, sizeof(struct ether_header))
void
ieee80211_superg_attach(struct ieee80211com *ic)
{
}
void
ieee80211_superg_detach(struct ieee80211com *ic)
{
}
void
ieee80211_superg_vattach(struct ieee80211vap *vap)
{
if (vap->iv_caps & IEEE80211_C_FF)
vap->iv_flags |= IEEE80211_F_FF;
/* NB: we only implement sta mode */
if (vap->iv_opmode == IEEE80211_M_STA &&
(vap->iv_caps & IEEE80211_C_TURBOP))
vap->iv_flags |= IEEE80211_F_TURBOP;
}
void
ieee80211_superg_vdetach(struct ieee80211vap *vap)
{
}
#define ATH_OUI_BYTES 0x00, 0x03, 0x7f
/*
* Add a WME information element to a frame.
*/
uint8_t *
ieee80211_add_ath(uint8_t *frm, uint8_t caps, ieee80211_keyix defkeyix)
{
static const struct ieee80211_ath_ie info = {
.ath_id = IEEE80211_ELEMID_VENDOR,
.ath_len = sizeof(struct ieee80211_ath_ie) - 2,
.ath_oui = { ATH_OUI_BYTES },
.ath_oui_type = ATH_OUI_TYPE,
.ath_oui_subtype= ATH_OUI_SUBTYPE,
.ath_version = ATH_OUI_VERSION,
};
struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm;
memcpy(frm, &info, sizeof(info));
ath->ath_capability = caps;
if (defkeyix != IEEE80211_KEYIX_NONE) {
ath->ath_defkeyix[0] = (defkeyix & 0xff);
ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff);
} else {
ath->ath_defkeyix[0] = 0xff;
ath->ath_defkeyix[1] = 0x7f;
}
return frm + sizeof(info);
}
#undef ATH_OUI_BYTES
uint8_t *
ieee80211_add_athcaps(uint8_t *frm, const struct ieee80211_node *bss)
{
const struct ieee80211vap *vap = bss->ni_vap;
return ieee80211_add_ath(frm,
vap->iv_flags & IEEE80211_F_ATHEROS,
((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
bss->ni_authmode != IEEE80211_AUTH_8021X) ?
vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
}
void
ieee80211_parse_ath(struct ieee80211_node *ni, uint8_t *ie)
{
const struct ieee80211_ath_ie *ath =
(const struct ieee80211_ath_ie *) ie;
ni->ni_ath_flags = ath->ath_capability;
ni->ni_ath_defkeyix = LE_READ_2(&ath->ath_defkeyix);
}
int
ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm,
const struct ieee80211_frame *wh)
{
struct ieee80211vap *vap = ni->ni_vap;
const struct ieee80211_ath_ie *ath;
u_int len = frm[1];
int capschanged;
uint16_t defkeyix;
if (len < sizeof(struct ieee80211_ath_ie)-2) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG,
wh, "Atheros", "too short, len %u", len);
return -1;
}
ath = (const struct ieee80211_ath_ie *)frm;
capschanged = (ni->ni_ath_flags != ath->ath_capability);
defkeyix = LE_READ_2(ath->ath_defkeyix);
if (capschanged || defkeyix != ni->ni_ath_defkeyix) {
ni->ni_ath_flags = ath->ath_capability;
ni->ni_ath_defkeyix = defkeyix;
IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
"ath ie change: new caps 0x%x defkeyix 0x%x",
ni->ni_ath_flags, ni->ni_ath_defkeyix);
}
if (IEEE80211_ATH_CAP(vap, ni, ATHEROS_CAP_TURBO_PRIME)) {
uint16_t curflags, newflags;
/*
* Check for turbo mode switch. Calculate flags
* for the new mode and effect the switch.
*/
newflags = curflags = vap->iv_ic->ic_bsschan->ic_flags;
/* NB: BOOST is not in ic_flags, so get it from the ie */
if (ath->ath_capability & ATHEROS_CAP_BOOST)
newflags |= IEEE80211_CHAN_TURBO;
else
newflags &= ~IEEE80211_CHAN_TURBO;
if (newflags != curflags)
ieee80211_dturbo_switch(vap, newflags);
}
return capschanged;
}
/*
* Decap the encapsulated frame pair and dispatch the first
* for delivery. The second frame is returned for delivery
* via the normal path.
*/
struct mbuf *
ieee80211_ff_decap(struct ieee80211_node *ni, struct mbuf *m)
{
#define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc))
#define MS(x,f) (((x) & f) >> f##_S)
struct ieee80211vap *vap = ni->ni_vap;
struct llc *llc;
uint32_t ath;
struct mbuf *n;
int framelen;
/* NB: we assume caller does this check for us */
KASSERT(IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF),
("ff not negotiated"));
/*
* Check for fast-frame tunnel encapsulation.
*/
if (m->m_pkthdr.len < 3*FF_LLC_SIZE)
return m;
if (m->m_len < FF_LLC_SIZE &&
(m = m_pullup(m, FF_LLC_SIZE)) == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "fast-frame",
"%s", "m_pullup(llc) failed");
vap->iv_stats.is_rx_tooshort++;
return NULL;
}
llc = (struct llc *)(mtod(m, uint8_t *) +
sizeof(struct ether_header));
if (llc->llc_snap.ether_type != htons(ATH_FF_ETH_TYPE))
return m;
m_adj(m, FF_LLC_SIZE);
m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath);
if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "fast-frame",
"unsupport tunnel protocol, header 0x%x", ath);
vap->iv_stats.is_ff_badhdr++;
m_freem(m);
return NULL;
}
/* NB: skip header and alignment padding */
m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2);
vap->iv_stats.is_ff_decap++;
/*
* Decap the first frame, bust it apart from the
* second and deliver; then decap the second frame
* and return it to the caller for normal delivery.
*/
m = ieee80211_decap1(m, &framelen);
if (m == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "fast-frame", "%s", "first decap failed");
vap->iv_stats.is_ff_tooshort++;
return NULL;
}
n = m_split(m, framelen, M_NOWAIT);
if (n == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "fast-frame",
"%s", "unable to split encapsulated frames");
vap->iv_stats.is_ff_split++;
m_freem(m); /* NB: must reclaim */
return NULL;
}
/* XXX not right for WDS */
vap->iv_deliver_data(vap, ni, m); /* 1st of pair */
/*
* Decap second frame.
*/
m_adj(n, roundup2(framelen, 4) - framelen); /* padding */
n = ieee80211_decap1(n, &framelen);
if (n == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "fast-frame", "%s", "second decap failed");
vap->iv_stats.is_ff_tooshort++;
}
/* XXX verify framelen against mbuf contents */
return n; /* 2nd delivered by caller */
#undef MS
#undef FF_LLC_SIZE
}
/*
* Do Ethernet-LLC encapsulation for each payload in a fast frame
* tunnel encapsulation. The frame is assumed to have an Ethernet
* header at the front that must be stripped before prepending the
* LLC followed by the Ethernet header passed in (with an Ethernet
* type that specifies the payload size).
*/
static struct mbuf *
ff_encap1(struct ieee80211vap *vap, struct mbuf *m,
const struct ether_header *eh)
{
struct llc *llc;
uint16_t payload;
/* XXX optimize by combining m_adj+M_PREPEND */
m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
llc = mtod(m, struct llc *);
llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
llc->llc_control = LLC_UI;
llc->llc_snap.org_code[0] = 0;
llc->llc_snap.org_code[1] = 0;
llc->llc_snap.org_code[2] = 0;
llc->llc_snap.ether_type = eh->ether_type;
payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */
M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT);
if (m == NULL) { /* XXX cannot happen */
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
"%s: no space for ether_header\n", __func__);
vap->iv_stats.is_tx_nobuf++;
return NULL;
}
ETHER_HEADER_COPY(mtod(m, void *), eh);
mtod(m, struct ether_header *)->ether_type = htons(payload);
return m;
}
/*
* Fast frame encapsulation. There must be two packets
* chained with m_nextpkt. We do header adjustment for
* each, add the tunnel encapsulation, and then concatenate
* the mbuf chains to form a single frame for transmission.
*/
struct mbuf *
ieee80211_ff_encap(struct ieee80211vap *vap, struct mbuf *m1, int hdrspace,
struct ieee80211_key *key)
{
struct mbuf *m2;
struct ether_header eh1, eh2;
struct llc *llc;
struct mbuf *m;
int pad;
m2 = m1->m_nextpkt;
if (m2 == NULL) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
"%s: only one frame\n", __func__);
goto bad;
}
m1->m_nextpkt = NULL;
/*
* Include fast frame headers in adjusting header
* layout; this allocates space according to what
* ff_encap will do.
*/
m1 = ieee80211_mbuf_adjust(vap,
hdrspace + sizeof(struct llc) + sizeof(uint32_t) + 2 +
sizeof(struct ether_header),
key, m1);
if (m1 == NULL) {
/* NB: ieee80211_mbuf_adjust handles msgs+statistics */
m_freem(m2);
goto bad;
}
/*
* Copy second frame's Ethernet header out of line
* and adjust for encapsulation headers. Note that
* we make room for padding in case there isn't room
* at the end of first frame.
*/
KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!"));
ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t));
m2 = ieee80211_mbuf_adjust(vap,
ATH_FF_MAX_HDR_PAD + sizeof(struct ether_header),
NULL, m2);
if (m2 == NULL) {
/* NB: ieee80211_mbuf_adjust handles msgs+statistics */
goto bad;
}
/*
* Now do tunnel encapsulation. First, each
* frame gets a standard encapsulation.
*/
m1 = ff_encap1(vap, m1, &eh1);
if (m1 == NULL)
goto bad;
m2 = ff_encap1(vap, m2, &eh2);
if (m2 == NULL)
goto bad;
/*
* Pad leading frame to a 4-byte boundary. If there
* is space at the end of the first frame, put it
* there; otherwise prepend to the front of the second
* frame. We know doing the second will always work
* because we reserve space above. We prefer appending
* as this typically has better DMA alignment properties.
*/
for (m = m1; m->m_next != NULL; m = m->m_next)
;
pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len;
if (pad) {
if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */
m2->m_data -= pad;
m2->m_len += pad;
m2->m_pkthdr.len += pad;
} else { /* append to first */
m->m_len += pad;
m1->m_pkthdr.len += pad;
}
}
/*
* Now, stick 'em together and prepend the tunnel headers;
* first the Atheros tunnel header (all zero for now) and
* then a special fast frame LLC.
*
* XXX optimize by prepending together
*/
m->m_next = m2; /* NB: last mbuf from above */
m1->m_pkthdr.len += m2->m_pkthdr.len;
M_PREPEND(m1, sizeof(uint32_t)+2, M_DONTWAIT);
if (m1 == NULL) { /* XXX cannot happen */
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
"%s: no space for tunnel header\n", __func__);
vap->iv_stats.is_tx_nobuf++;
return NULL;
}
memset(mtod(m1, void *), 0, sizeof(uint32_t)+2);
M_PREPEND(m1, sizeof(struct llc), M_DONTWAIT);
if (m1 == NULL) { /* XXX cannot happen */
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
"%s: no space for llc header\n", __func__);
vap->iv_stats.is_tx_nobuf++;
return NULL;
}
llc = mtod(m1, struct llc *);
llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
llc->llc_control = LLC_UI;
llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0;
llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1;
llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2;
llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE);
vap->iv_stats.is_ff_encap++;
return m1;
bad:
if (m1 != NULL)
m_freem(m1);
if (m2 != NULL)
m_freem(m2);
return NULL;
}
/*
* Switch between turbo and non-turbo operating modes.
* Use the specified channel flags to locate the new
* channel, update 802.11 state, and then call back into
* the driver to effect the change.
*/
void
ieee80211_dturbo_switch(struct ieee80211vap *vap, int newflags)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_channel *chan;
chan = ieee80211_find_channel(ic, ic->ic_bsschan->ic_freq, newflags);
if (chan == NULL) { /* XXX should not happen */
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
"%s: no channel with freq %u flags 0x%x\n",
__func__, ic->ic_bsschan->ic_freq, newflags);
return;
}
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
"%s: %s -> %s (freq %u flags 0x%x)\n", __func__,
ieee80211_phymode_name[ieee80211_chan2mode(ic->ic_bsschan)],
ieee80211_phymode_name[ieee80211_chan2mode(chan)],
chan->ic_freq, chan->ic_flags);
ic->ic_bsschan = chan;
ic->ic_prevchan = ic->ic_curchan;
ic->ic_curchan = chan;
ic->ic_set_channel(ic);
/* NB: do not need to reset ERP state 'cuz we're in sta mode */
}
/*
* Return the current ``state'' of an Atheros capbility.
* If associated in station mode report the negotiated
* setting. Otherwise report the current setting.
*/
static int
getathcap(struct ieee80211vap *vap, int cap)
{
if (vap->iv_opmode == IEEE80211_M_STA &&
vap->iv_state == IEEE80211_S_RUN)
return IEEE80211_ATH_CAP(vap, vap->iv_bss, cap) != 0;
else
return (vap->iv_flags & cap) != 0;
}
static int
superg_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
{
switch (ireq->i_type) {
case IEEE80211_IOC_FF:
ireq->i_val = getathcap(vap, IEEE80211_F_FF);
break;
case IEEE80211_IOC_TURBOP:
ireq->i_val = getathcap(vap, IEEE80211_F_TURBOP);
break;
default:
return ENOSYS;
}
return 0;
}
IEEE80211_IOCTL_GET(superg, superg_ioctl_get80211);
static int
superg_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
{
switch (ireq->i_type) {
case IEEE80211_IOC_FF:
if (ireq->i_val) {
if ((vap->iv_caps & IEEE80211_C_FF) == 0)
return EOPNOTSUPP;
vap->iv_flags |= IEEE80211_F_FF;
} else
vap->iv_flags &= ~IEEE80211_F_FF;
return ERESTART;
case IEEE80211_IOC_TURBOP:
if (ireq->i_val) {
if ((vap->iv_caps & IEEE80211_C_TURBOP) == 0)
return EOPNOTSUPP;
vap->iv_flags |= IEEE80211_F_TURBOP;
} else
vap->iv_flags &= ~IEEE80211_F_TURBOP;
return ENETRESET;
default:
return ENOSYS;
}
return 0;
}
IEEE80211_IOCTL_SET(superg, superg_ioctl_set80211);