mirror of https://github.com/proski/madwifi
Refcount fix for netif_rx() and friends, returning error and dropping SKB but we were not releasing our node reference.
Refcount fix for skb_clone/etc where we were not keeping reference counter matching the number of skbuff instances and were not having enough references. git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@2894 0192ed92-7a03-0410-a25b-9323aeb14dbd
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09b1e7bb56
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0c4e2a41e9
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@ -707,7 +707,11 @@ ieee80211_input(struct ieee80211_node *ni,
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/* ether_type must be length as FF frames are always LLC/SNAP encap'd */
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frame_len = ntohs(eh_tmp->ether_type);
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skb1 = skb_clone(skb, GFP_ATOMIC); /* XXX: GFP_ATOMIC is overkill? */
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skb1 = skb_clone(skb, GFP_ATOMIC);
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/* Increment reference count after copy */
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if (NULL != skb1 && SKB_CB(skb)->ni != NULL) {
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SKB_CB(skb1)->ni = ieee80211_ref_node(SKB_CB(skb)->ni);
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}
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/* we now have 802.3 MAC hdr followed by 802.2 LLC/SNAP; convert to EthernetII.
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* Note that the frame is at least IEEE80211_MIN_LEN, due to the driver code. */
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@ -915,9 +919,12 @@ ieee80211_input_all(struct ieee80211com *ic,
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if (TAILQ_NEXT(vap, iv_next) != NULL) {
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skb1 = skb_copy(skb, GFP_ATOMIC);
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if (skb1 == NULL) {
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/* XXX stat+msg */
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continue;
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}
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/* We duplicate the reference after skb_copy */
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if (SKB_CB(skb)->ni != NULL) {
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SKB_CB(skb1)->ni = ieee80211_ref_node(SKB_CB(skb)->ni);
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}
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} else {
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skb1 = skb;
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skb = NULL;
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@ -1023,6 +1030,10 @@ ieee80211_defrag(struct ieee80211_node *ni, struct sk_buff *skb, int hdrlen)
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* assemble fragments
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*/
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ni->ni_rxfrag = skb_copy(skb, GFP_ATOMIC);
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/* We duplicate the reference after skb_copy */
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if (SKB_CB(skb)->ni != NULL) {
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SKB_CB(ni->ni_rxfrag)->ni = ieee80211_ref_node(SKB_CB(skb)->ni);
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}
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dev_kfree_skb(skb);
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}
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/*
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@ -1036,6 +1047,10 @@ ieee80211_defrag(struct ieee80211_node *ni, struct sk_buff *skb, int hdrlen)
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(ni->ni_vap->iv_dev->mtu + hdrlen) -
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(skb_end_pointer(skb) - skb->head),
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GFP_ATOMIC);
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/* We duplicate the reference after skb_copy */
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if (SKB_CB(skb)->ni != NULL && (skb != ni->ni_rxfrag)) {
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SKB_CB(ni->ni_rxfrag)->ni = ieee80211_ref_node(SKB_CB(skb)->ni);
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}
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dev_kfree_skb(skb);
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}
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}
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@ -1077,6 +1092,7 @@ ieee80211_deliver_data(struct ieee80211_node *ni, struct sk_buff *skb)
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struct ieee80211vap *vap = ni->ni_vap;
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struct net_device *dev = vap->iv_dev;
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struct ether_header *eh = (struct ether_header *) skb->data;
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struct ieee80211_node * ni_tmp = NULL;
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#ifdef ATH_SUPERG_XR
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/*
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@ -1094,8 +1110,13 @@ ieee80211_deliver_data(struct ieee80211_node *ni, struct sk_buff *skb)
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(vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
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struct sk_buff *skb1 = NULL;
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if (ETHER_IS_MULTICAST(eh->ether_dhost))
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if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
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skb1 = skb_copy(skb, GFP_ATOMIC);
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/* We duplicate the reference after skb_copy */
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if (SKB_CB(skb)->ni != NULL) {
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SKB_CB(skb1)->ni = ieee80211_ref_node(SKB_CB(skb)->ni);
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}
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}
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else {
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/*
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* Check if destination is associated with the
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@ -1124,7 +1145,19 @@ ieee80211_deliver_data(struct ieee80211_node *ni, struct sk_buff *skb)
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skb1->protocol = __constant_htons(ETH_P_802_2);
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/* XXX insert vlan tag before queue it? */
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dev_queue_xmit(skb1);
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ni_tmp = SKB_CB(skb1)->ni; /* remember node so we can free it */
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if ( dev_queue_xmit(skb1) == NET_XMIT_DROP ) {
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/* If queue dropped the packet because device was
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* too busy */
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vap->iv_devstats.tx_dropped++;
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/* node reference was leaked */
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if (ni_tmp != NULL)
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ieee80211_unref_node(&ni_tmp);
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}
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/* skb is no longer ours, either way after dev_queue_xmit */
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skb1 = NULL;
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/* no need to free node reference */
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ni_tmp = NULL;
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}
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}
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@ -1136,11 +1169,34 @@ ieee80211_deliver_data(struct ieee80211_node *ni, struct sk_buff *skb)
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#else
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skb->protocol = eth_type_trans(skb, dev);
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#endif
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vap->iv_devstats.rx_packets++;
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vap->iv_devstats.rx_bytes += skb->len;
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if (ni->ni_vlan != 0 && vap->iv_vlgrp != NULL) {
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/* attach vlan tag */
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vlan_hwaccel_receive_skb(skb, vap->iv_vlgrp, ni->ni_vlan);
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} else
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netif_rx(skb);
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struct ieee80211_node *ni_tmp = SKB_CB(skb)->ni;
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if (vlan_hwaccel_receive_skb(skb, vap->iv_vlgrp, ni->ni_vlan) == NET_RX_DROP) {
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/* If netif_rx dropped the packet because
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* device was too busy */
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if (ni_tmp != NULL) {
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/* node reference was leaked */
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ieee80211_unref_node(&ni_tmp);
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}
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vap->iv_devstats.rx_dropped++;
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}
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skb = NULL; /* SKB is no longer ours */
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} else {
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struct ieee80211_node *ni_tmp = SKB_CB(skb)->ni;
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if (netif_rx(skb) == NET_RX_DROP) {
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/* If netif_rx dropped the packet because
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* device was too busy */
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if (ni_tmp != NULL) {
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/* node reference was leaked */
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ieee80211_unref_node(&ni_tmp);
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}
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vap->iv_devstats.rx_dropped++;
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}
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skb = NULL; /* SKB is no longer ours */
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}
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dev->last_rx = jiffies;
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}
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}
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@ -1203,6 +1259,10 @@ ieee80211_decap(struct ieee80211vap *vap, struct sk_buff *skb, int hdrlen)
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/* XXX: does this always work? */
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tskb = skb_copy(skb, GFP_ATOMIC);
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/* We duplicate the reference after skb_copy */
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if (SKB_CB(skb)->ni != NULL) {
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SKB_CB(tskb)->ni = ieee80211_ref_node(SKB_CB(skb)->ni);
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}
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dev_kfree_skb(skb);
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skb = tskb;
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}
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@ -2234,10 +2294,15 @@ forward_mgmt_to_app(struct ieee80211vap *vap, int subtype, struct sk_buff *skb,
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if (filter_type && ((vap->app_filter & filter_type) == filter_type)) {
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struct sk_buff *skb1;
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struct ieee80211_node *ni_tmp;
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skb1 = skb_copy(skb, GFP_ATOMIC);
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if (skb1 == NULL)
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return;
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/* We duplicate the reference after skb_copy */
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if (SKB_CB(skb)->ni != NULL) {
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SKB_CB(skb1)->ni = ieee80211_ref_node(SKB_CB(skb)->ni);
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}
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skb1->dev = dev;
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skb_reset_mac_header(skb1);
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@ -2245,7 +2310,18 @@ forward_mgmt_to_app(struct ieee80211vap *vap, int subtype, struct sk_buff *skb,
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skb1->pkt_type = PACKET_OTHERHOST;
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skb1->protocol = __constant_htons(0x0019); /* ETH_P_80211_RAW */
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netif_rx(skb1);
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ni_tmp = SKB_CB(skb1)->ni;
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if (netif_rx(skb1) == NET_RX_DROP) {
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/* If netif_rx dropped the packet because
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* device was too busy */
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if (ni_tmp != NULL) {
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/* node reference was leaked */
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ieee80211_unref_node(&ni_tmp);
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}
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vap->iv_devstats.rx_dropped++;
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}
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vap->iv_devstats.rx_packets++;
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vap->iv_devstats.rx_bytes += skb1->len;
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}
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}
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@ -2288,8 +2364,10 @@ ieee80211_doth_cancel_cs(struct ieee80211vap *vap)
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del_timer(&vap->iv_csa_timer);
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if (vap->iv_csa_jiffies)
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOTH,
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"channel switch canceled (was: to %u in %u "
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"tbtt, mode %u)\n", vap->iv_csa_chan->ic_ieee,
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"channel switch canceled (was: to %3d (%4d MHz) in %u "
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"TBTT, mode %u)\n",
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vap->iv_csa_chan->ic_ieee,
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vap->iv_csa_chan->ic_freq,
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vap->iv_csa_count, vap->iv_csa_mode);
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vap->iv_csa_jiffies = 0;
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}
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@ -2300,8 +2378,10 @@ ieee80211_doth_switch_channel(struct ieee80211vap *vap)
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struct ieee80211com *ic = vap->iv_ic;
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOTH,
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"%s: Channel switch to %d NOW!\n",
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__func__, vap->iv_csa_chan->ic_ieee);
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"%s: Channel switch to %3d (%4d MHz) NOW!\n",
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__func__,
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vap->iv_csa_chan->ic_ieee,
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vap->iv_csa_chan->ic_freq);
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#if 0
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/* XXX does not belong here? */
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/* XXX doesn't stop management frames */
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/* XXX abuse? */
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOTH,
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"%s: channel switch channel "
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"changed from %u to %u!\n", __func__,
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vap->iv_csa_chan->ic_ieee,
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csa_ie->csa_chan);
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"changed from %3d (%4d MHz) to %u!\n",
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__func__,
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vap->iv_csa_chan->ic_ieee,
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vap->iv_csa_chan->ic_freq,
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csa_ie->csa_chan);
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if (vap->iv_csa_count > IEEE80211_CSA_PROTECTION_PERIOD)
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ieee80211_doth_cancel_cs(vap);
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@ -2497,8 +2579,7 @@ ieee80211_deliver_l2uf(struct ieee80211_node *ni)
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struct ether_header *eh;
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skb = dev_alloc_skb(sizeof(*l2uf));
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if (!skb) {
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printk("ieee80211_deliver_l2uf: no buf available\n");
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if (skb == NULL) {
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return;
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}
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skb_put(skb, sizeof(*l2uf));
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