Included fixes:
- recognise and drop Bridge Loop Avoidance packets even if they are encapsulated in the 802.1q header multiple times. Forwarding them into the mesh creates issues on other nodes. - properly handle VLAN private objects in order to avoid race conditions upon fast VLAN deletion-addition. Such conditions create an unrecoverable inconsistency in the TT database of the nodes. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAABCAAGBQJTzMYfAAoJEJgn97Bh2u9eKLIP+wWwqvRe5hFleA7Xd7vHS769 20TrhDPZrQAcaK8dg8/VpqUZ4oGAi0WHhbhAdur1Vj3Ie5DDsqqu45lK9a/o+PAe avWafxcPcK5LLoLbDKNxX98n6BN3aNFIp7rUy4CDO7Beix/PfQUYGbZ01IEueNlX tvKz1oO7r3SvWFELltSU7bndU+0NoZRon5qXSaxnlYHMXcsJEJAKRPE9eLdwXUaF 9h0oIKkPVQt8YFn0w1zZRePSPWGQSAb20exgRGwPxI23xs7ui1i+s5Od9aSt8FcR e6eNuMDsuHVeAmW+nsxF3WAyYGIGyaTb9sSkwrToXZge7BRFRfphKN1WHD1bp6A5 a0Lu3wkzCJbrS3LZkjt99jh+0XAaaoWkAt4Lu4+VUcMYtfITHHHN4kfmzoPE7Z8y Qq64KL/ry6v2lqGk2+9G5/oHXMAYAyed+TPk/HSn5O0CS+zXxXFvrvbYyQyFg99X BcuOD6dGLbfaPQh9XuCE9jJ2D5QHnkAXj2FlK5oFd7y6ASdLltratTYNKJ4T7cVR +cyBkZ6cI3Ehzq1jrR8/9qqAal+a/jdzne6J7DPnWksDWxnTylANuWecVkETkpcL mUp6Zv9SYISqQSPtrbE7xu1XW/ICoajc+6H0eEOFhKU+JEqKjxwSE2QoKvzxeC8Y OHIbq99fItGwH7Vuldkg =RdJM -----END PGP SIGNATURE----- Merge tag 'batman-adv-fix-for-davem' of git://git.open-mesh.org/linux-merge Antonio Quartulli says: ==================== pull request [net]: batman-adv 20140721 here you have two fixes that we have been testing for quite some time (this is why they arrived a bit late in the rc cycle). Patch 1) ensures that BLA packets get dropped and not forwarded to the mesh even if they reach batman-adv within QinQ frames. Forwarding them into the mesh means messing up with the TT database of other nodes which can generate all kind of unexpected behaviours during route computation. Patch 2) avoids a couple of race conditions triggered upon fast VLAN deletion-addition. Such race conditions are pretty dangerous because they not only create inconsistencies in the TT database of the nodes in the network, but such scenario is also unrecoverable (unless nodes are rebooted). ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
Коммит
850717ef00
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@ -800,11 +800,6 @@ static int batadv_check_claim_group(struct batadv_priv *bat_priv,
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bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
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bla_dst_own = &bat_priv->bla.claim_dest;
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/* check if it is a claim packet in general */
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if (memcmp(bla_dst->magic, bla_dst_own->magic,
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sizeof(bla_dst->magic)) != 0)
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return 0;
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/* if announcement packet, use the source,
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* otherwise assume it is in the hw_src
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*/
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@ -866,12 +861,13 @@ static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
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struct batadv_hard_iface *primary_if,
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struct sk_buff *skb)
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{
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struct batadv_bla_claim_dst *bla_dst;
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struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
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uint8_t *hw_src, *hw_dst;
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struct vlan_ethhdr *vhdr;
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struct vlan_hdr *vhdr, vhdr_buf;
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struct ethhdr *ethhdr;
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struct arphdr *arphdr;
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unsigned short vid;
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int vlan_depth = 0;
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__be16 proto;
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int headlen;
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int ret;
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@ -882,9 +878,24 @@ static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
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proto = ethhdr->h_proto;
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headlen = ETH_HLEN;
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if (vid & BATADV_VLAN_HAS_TAG) {
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vhdr = vlan_eth_hdr(skb);
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proto = vhdr->h_vlan_encapsulated_proto;
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headlen += VLAN_HLEN;
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/* Traverse the VLAN/Ethertypes.
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*
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* At this point it is known that the first protocol is a VLAN
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* header, so start checking at the encapsulated protocol.
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*
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* The depth of the VLAN headers is recorded to drop BLA claim
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* frames encapsulated into multiple VLAN headers (QinQ).
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*/
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do {
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vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN,
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&vhdr_buf);
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if (!vhdr)
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return 0;
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proto = vhdr->h_vlan_encapsulated_proto;
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headlen += VLAN_HLEN;
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vlan_depth++;
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} while (proto == htons(ETH_P_8021Q));
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}
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if (proto != htons(ETH_P_ARP))
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@ -914,6 +925,19 @@ static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
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hw_src = (uint8_t *)arphdr + sizeof(struct arphdr);
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hw_dst = hw_src + ETH_ALEN + 4;
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bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
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bla_dst_own = &bat_priv->bla.claim_dest;
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/* check if it is a claim frame in general */
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if (memcmp(bla_dst->magic, bla_dst_own->magic,
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sizeof(bla_dst->magic)) != 0)
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return 0;
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/* check if there is a claim frame encapsulated deeper in (QinQ) and
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* drop that, as this is not supported by BLA but should also not be
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* sent via the mesh.
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*/
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if (vlan_depth > 1)
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return 1;
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/* check if it is a claim frame. */
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ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
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@ -448,10 +448,15 @@ out:
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* possibly free it
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* @softif_vlan: the vlan object to release
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*/
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void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *softif_vlan)
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void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan)
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{
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if (atomic_dec_and_test(&softif_vlan->refcount))
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kfree_rcu(softif_vlan, rcu);
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if (atomic_dec_and_test(&vlan->refcount)) {
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spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
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hlist_del_rcu(&vlan->list);
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spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
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kfree_rcu(vlan, rcu);
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}
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}
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/**
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@ -505,6 +510,7 @@ int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
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if (!vlan)
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return -ENOMEM;
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vlan->bat_priv = bat_priv;
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vlan->vid = vid;
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atomic_set(&vlan->refcount, 1);
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@ -516,6 +522,10 @@ int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
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return err;
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}
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spin_lock_bh(&bat_priv->softif_vlan_list_lock);
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hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
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spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
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/* add a new TT local entry. This one will be marked with the NOPURGE
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* flag
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*/
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@ -523,10 +533,6 @@ int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
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bat_priv->soft_iface->dev_addr, vid,
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BATADV_NULL_IFINDEX, BATADV_NO_MARK);
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spin_lock_bh(&bat_priv->softif_vlan_list_lock);
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hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
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spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
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return 0;
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}
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@ -538,18 +544,13 @@ int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
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static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
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struct batadv_softif_vlan *vlan)
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{
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spin_lock_bh(&bat_priv->softif_vlan_list_lock);
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hlist_del_rcu(&vlan->list);
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spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
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batadv_sysfs_del_vlan(bat_priv, vlan);
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/* explicitly remove the associated TT local entry because it is marked
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* with the NOPURGE flag
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*/
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batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
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vlan->vid, "vlan interface destroyed", false);
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batadv_sysfs_del_vlan(bat_priv, vlan);
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batadv_softif_vlan_free_ref(vlan);
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}
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@ -567,6 +568,8 @@ static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
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unsigned short vid)
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{
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struct batadv_priv *bat_priv = netdev_priv(dev);
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struct batadv_softif_vlan *vlan;
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int ret;
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/* only 802.1Q vlans are supported.
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* batman-adv does not know how to handle other types
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@ -576,7 +579,36 @@ static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
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vid |= BATADV_VLAN_HAS_TAG;
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return batadv_softif_create_vlan(bat_priv, vid);
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/* if a new vlan is getting created and it already exists, it means that
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* it was not deleted yet. batadv_softif_vlan_get() increases the
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* refcount in order to revive the object.
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*
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* if it does not exist then create it.
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*/
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vlan = batadv_softif_vlan_get(bat_priv, vid);
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if (!vlan)
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return batadv_softif_create_vlan(bat_priv, vid);
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/* recreate the sysfs object if it was already destroyed (and it should
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* be since we received a kill_vid() for this vlan
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*/
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if (!vlan->kobj) {
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ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
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if (ret) {
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batadv_softif_vlan_free_ref(vlan);
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return ret;
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}
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}
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/* add a new TT local entry. This one will be marked with the NOPURGE
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* flag. This must be added again, even if the vlan object already
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* exists, because the entry was deleted by kill_vid()
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*/
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batadv_tt_local_add(bat_priv->soft_iface,
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bat_priv->soft_iface->dev_addr, vid,
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BATADV_NULL_IFINDEX, BATADV_NO_MARK);
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return 0;
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}
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/**
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@ -511,6 +511,7 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
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struct batadv_priv *bat_priv = netdev_priv(soft_iface);
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struct batadv_tt_local_entry *tt_local;
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struct batadv_tt_global_entry *tt_global = NULL;
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struct batadv_softif_vlan *vlan;
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struct net_device *in_dev = NULL;
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struct hlist_head *head;
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struct batadv_tt_orig_list_entry *orig_entry;
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@ -572,6 +573,9 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
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if (!tt_local)
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goto out;
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/* increase the refcounter of the related vlan */
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vlan = batadv_softif_vlan_get(bat_priv, vid);
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batadv_dbg(BATADV_DBG_TT, bat_priv,
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"Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
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addr, BATADV_PRINT_VID(vid),
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@ -604,6 +608,7 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
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if (unlikely(hash_added != 0)) {
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/* remove the reference for the hash */
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batadv_tt_local_entry_free_ref(tt_local);
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batadv_softif_vlan_free_ref(vlan);
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goto out;
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}
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@ -1009,6 +1014,7 @@ uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
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{
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struct batadv_tt_local_entry *tt_local_entry;
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uint16_t flags, curr_flags = BATADV_NO_FLAGS;
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struct batadv_softif_vlan *vlan;
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tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
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if (!tt_local_entry)
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@ -1039,6 +1045,11 @@ uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
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hlist_del_rcu(&tt_local_entry->common.hash_entry);
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batadv_tt_local_entry_free_ref(tt_local_entry);
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/* decrease the reference held for this vlan */
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vlan = batadv_softif_vlan_get(bat_priv, vid);
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batadv_softif_vlan_free_ref(vlan);
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batadv_softif_vlan_free_ref(vlan);
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out:
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if (tt_local_entry)
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batadv_tt_local_entry_free_ref(tt_local_entry);
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@ -1111,6 +1122,7 @@ static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
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spinlock_t *list_lock; /* protects write access to the hash lists */
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struct batadv_tt_common_entry *tt_common_entry;
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struct batadv_tt_local_entry *tt_local;
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struct batadv_softif_vlan *vlan;
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struct hlist_node *node_tmp;
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struct hlist_head *head;
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uint32_t i;
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@ -1131,6 +1143,13 @@ static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
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tt_local = container_of(tt_common_entry,
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struct batadv_tt_local_entry,
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common);
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/* decrease the reference held for this vlan */
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vlan = batadv_softif_vlan_get(bat_priv,
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tt_common_entry->vid);
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batadv_softif_vlan_free_ref(vlan);
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batadv_softif_vlan_free_ref(vlan);
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batadv_tt_local_entry_free_ref(tt_local);
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}
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spin_unlock_bh(list_lock);
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@ -3139,6 +3158,7 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
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struct batadv_hashtable *hash = bat_priv->tt.local_hash;
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struct batadv_tt_common_entry *tt_common;
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struct batadv_tt_local_entry *tt_local;
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struct batadv_softif_vlan *vlan;
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struct hlist_node *node_tmp;
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struct hlist_head *head;
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spinlock_t *list_lock; /* protects write access to the hash lists */
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@ -3167,6 +3187,12 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
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tt_local = container_of(tt_common,
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struct batadv_tt_local_entry,
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common);
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/* decrease the reference held for this vlan */
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vlan = batadv_softif_vlan_get(bat_priv, tt_common->vid);
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batadv_softif_vlan_free_ref(vlan);
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batadv_softif_vlan_free_ref(vlan);
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batadv_tt_local_entry_free_ref(tt_local);
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}
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spin_unlock_bh(list_lock);
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@ -687,6 +687,7 @@ struct batadv_priv_nc {
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/**
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* struct batadv_softif_vlan - per VLAN attributes set
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* @bat_priv: pointer to the mesh object
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* @vid: VLAN identifier
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* @kobj: kobject for sysfs vlan subdirectory
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* @ap_isolation: AP isolation state
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@ -696,6 +697,7 @@ struct batadv_priv_nc {
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* @rcu: struct used for freeing in a RCU-safe manner
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*/
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struct batadv_softif_vlan {
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struct batadv_priv *bat_priv;
|
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unsigned short vid;
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struct kobject *kobj;
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atomic_t ap_isolation; /* boolean */
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