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[MAC80211]: ratelimit some RX messages
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Many if not all of these messages can be triggered by sending
a few rogue frames which is trivially done and then we overflow
our logs.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Michael Wu <flamingice@sourmilk.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Johannes Berg authored and David S. Miller committed Oct 10, 2007
1 parent aaa92e9 commit 1a84f3f
Showing 1 changed file with 74 additions and 48 deletions.
122 changes: 74 additions & 48 deletions net/mac80211/rx.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -336,13 +336,16 @@ ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx)
if (!rx->key) {
if (!rx->u.rx.ra_match)
return TXRX_DROP;
printk(KERN_DEBUG "%s: RX WEP frame with "
"unknown keyidx %d (A1=" MAC_FMT " A2="
MAC_FMT " A3=" MAC_FMT ")\n",
rx->dev->name, keyidx,
MAC_ARG(hdr->addr1),
MAC_ARG(hdr->addr2),
MAC_ARG(hdr->addr3));
if (net_ratelimit())
printk(KERN_DEBUG "%s: RX WEP frame "
"with unknown keyidx %d "
"(A1=" MAC_FMT
" A2=" MAC_FMT
" A3=" MAC_FMT ")\n",
rx->dev->name, keyidx,
MAC_ARG(hdr->addr1),
MAC_ARG(hdr->addr2),
MAC_ARG(hdr->addr3));
if (!rx->local->apdev)
return TXRX_DROP;
ieee80211_rx_mgmt(
Expand Down Expand Up @@ -526,16 +529,18 @@ ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
return TXRX_CONTINUE;

if (!rx->key) {
printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
rx->dev->name);
if (net_ratelimit())
printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
rx->dev->name);
return TXRX_DROP;
}

if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) ||
rx->key->force_sw_encrypt) {
if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
"failed\n", rx->dev->name);
if (net_ratelimit())
printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
"failed\n", rx->dev->name);
return TXRX_DROP;
}
} else if (rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
Expand Down Expand Up @@ -692,12 +697,15 @@ ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
}
rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
printk(KERN_DEBUG "%s: defrag: CCMP PN not sequential"
" A2=" MAC_FMT " PN=%02x%02x%02x%02x%02x%02x "
"(expected %02x%02x%02x%02x%02x%02x)\n",
rx->dev->name, MAC_ARG(hdr->addr2),
rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], rpn[5],
pn[0], pn[1], pn[2], pn[3], pn[4], pn[5]);
if (net_ratelimit())
printk(KERN_DEBUG "%s: defrag: CCMP PN not "
"sequential A2=" MAC_FMT
" PN=%02x%02x%02x%02x%02x%02x "
"(expected %02x%02x%02x%02x%02x%02x)\n",
rx->dev->name, MAC_ARG(hdr->addr2),
rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
rpn[5], pn[0], pn[1], pn[2], pn[3],
pn[4], pn[5]);
return TXRX_DROP;
}
memcpy(entry->last_pn, pn, CCMP_PN_LEN);
Expand Down Expand Up @@ -875,8 +883,9 @@ ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
(rx->key || rx->sdata->drop_unencrypted) &&
(rx->sdata->eapol == 0 ||
!ieee80211_is_eapol(rx->skb)))) {
printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
"encryption\n", rx->dev->name);
if (net_ratelimit())
printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
"encryption\n", rx->dev->name);
return TXRX_DROP;
}
return TXRX_CONTINUE;
Expand Down Expand Up @@ -922,10 +931,15 @@ ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)

if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
sdata->type != IEEE80211_IF_TYPE_VLAN)) {
printk(KERN_DEBUG "%s: dropped ToDS frame (BSSID="
MAC_FMT " SA=" MAC_FMT " DA=" MAC_FMT ")\n",
dev->name, MAC_ARG(hdr->addr1),
MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3));
if (net_ratelimit())
printk(KERN_DEBUG "%s: dropped ToDS frame "
"(BSSID=" MAC_FMT
" SA=" MAC_FMT
" DA=" MAC_FMT ")\n",
dev->name,
MAC_ARG(hdr->addr1),
MAC_ARG(hdr->addr2),
MAC_ARG(hdr->addr3));
return TXRX_DROP;
}
break;
Expand All @@ -935,12 +949,16 @@ ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
memcpy(src, hdr->addr4, ETH_ALEN);

if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
printk(KERN_DEBUG "%s: dropped FromDS&ToDS frame (RA="
MAC_FMT " TA=" MAC_FMT " DA=" MAC_FMT " SA="
MAC_FMT ")\n",
rx->dev->name, MAC_ARG(hdr->addr1),
MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3),
MAC_ARG(hdr->addr4));
if (net_ratelimit())
printk(KERN_DEBUG "%s: dropped FromDS&ToDS "
"frame (RA=" MAC_FMT
" TA=" MAC_FMT " DA=" MAC_FMT
" SA=" MAC_FMT ")\n",
rx->dev->name,
MAC_ARG(hdr->addr1),
MAC_ARG(hdr->addr2),
MAC_ARG(hdr->addr3),
MAC_ARG(hdr->addr4));
return TXRX_DROP;
}
break;
Expand Down Expand Up @@ -1015,15 +1033,16 @@ ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
/* send multicast frames both to higher layers in
* local net stack and back to the wireless media */
skb2 = skb_copy(skb, GFP_ATOMIC);
if (!skb2)
if (!skb2 && net_ratelimit())
printk(KERN_DEBUG "%s: failed to clone "
"multicast frame\n", dev->name);
} else {
struct sta_info *dsta;
dsta = sta_info_get(local, skb->data);
if (dsta && !dsta->dev) {
printk(KERN_DEBUG "Station with null dev "
"structure!\n");
if (net_ratelimit())
printk(KERN_DEBUG "Station with null "
"dev structure!\n");
} else if (dsta && dsta->dev == dev) {
/* Destination station is associated to this
* AP, so send the frame directly to it and
Expand Down Expand Up @@ -1135,24 +1154,28 @@ static void ieee80211_rx_michael_mic_report(struct net_device *dev,

/* TODO: verify that this is not triggered by fragmented
* frames (hw does not verify MIC for them). */
printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
"failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1), keyidx);
if (net_ratelimit())
printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
"failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1),
keyidx);

if (!sta) {
/* Some hardware versions seem to generate incorrect
* Michael MIC reports; ignore them to avoid triggering
* countermeasures. */
printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
"error for unknown address " MAC_FMT "\n",
dev->name, MAC_ARG(hdr->addr2));
if (net_ratelimit())
printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
"error for unknown address " MAC_FMT "\n",
dev->name, MAC_ARG(hdr->addr2));
goto ignore;
}

if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
"error for a frame with no ISWEP flag (src "
MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
if (net_ratelimit())
printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
"error for a frame with no ISWEP flag (src "
MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
goto ignore;
}

Expand All @@ -1164,20 +1187,23 @@ static void ieee80211_rx_michael_mic_report(struct net_device *dev,
* for group keys and only the AP is sending real multicast
* frames in BSS. */
if (keyidx) {
printk(KERN_DEBUG "%s: ignored Michael MIC error for "
"a frame with non-zero keyidx (%d) (src " MAC_FMT
")\n", dev->name, keyidx, MAC_ARG(hdr->addr2));
if (net_ratelimit())
printk(KERN_DEBUG "%s: ignored Michael MIC "
"error for a frame with non-zero keyidx"
" (%d) (src " MAC_FMT ")\n", dev->name,
keyidx, MAC_ARG(hdr->addr2));
goto ignore;
}
}

if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
(rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
"error for a frame that cannot be encrypted "
"(fc=0x%04x) (src " MAC_FMT ")\n",
dev->name, rx->fc, MAC_ARG(hdr->addr2));
if (net_ratelimit())
printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
"error for a frame that cannot be encrypted "
"(fc=0x%04x) (src " MAC_FMT ")\n",
dev->name, rx->fc, MAC_ARG(hdr->addr2));
goto ignore;
}

Expand Down

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