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batman-adv: add pending patches 

Fixes checksum failures on TT version updates.

Fixes #1321
This commit is contained in:
Matthias Schiffer 2018-03-16 19:52:36 +01:00
parent 7b8ee50ceb
commit 22cdd1d78e
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1 changed files with 484 additions and 0 deletions
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patches/packages/routing/0004-batman-adv-add-pending-patches.patch Normal file
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@ -0,0 +1,484 @@
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Fri, 16 Mar 2018 19:46:36 +0100
Subject: batman-adv: add pending patches
Fixes checksum failures on TT version updates.
diff --git a/batman-adv/patches/1001-batman-adv-update-data-pointers-after-skb_cow.patch b/batman-adv/patches/1001-batman-adv-update-data-pointers-after-skb_cow.patch
new file mode 100644
index 0000000000000000000000000000000000000000..eee1714d2526b8e989504139cc9eae79a6999436
--- /dev/null
+++ b/batman-adv/patches/1001-batman-adv-update-data-pointers-after-skb_cow.patch
@@ -0,0 +1,62 @@
+From b512c268fbe9f9d61eadc579457d6b825fcf3638 Mon Sep 17 00:00:00 2001
+Message-Id: <b512c268fbe9f9d61eadc579457d6b825fcf3638.1521225964.git.mschiffer@universe-factory.net>
+From: Matthias Schiffer <mschiffer@universe-factory.net>
+Date: Wed, 14 Mar 2018 18:14:27 +0100
+Subject: [PATCH 1001/1003] batman-adv: update data pointers after skb_cow()
+
+batadv_check_unicast_ttvn() calls skb_cow(), so pointers into the SKB data
+must be (re)set after calling it. The ethhdr variable is dropped
+altogether.
+
+Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
+---
+ net/batman-adv/routing.c | 10 +++++-----
+ 1 file changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
+index 289df027ecdd..0f10c565ac85 100644
+--- a/net/batman-adv/routing.c
++++ b/net/batman-adv/routing.c
+@@ -968,14 +968,10 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
+ struct batadv_orig_node *orig_node = NULL, *orig_node_gw = NULL;
+ int check, hdr_size = sizeof(*unicast_packet);
+ enum batadv_subtype subtype;
+- struct ethhdr *ethhdr;
+ int ret = NET_RX_DROP;
+ bool is4addr, is_gw;
+
+ unicast_packet = (struct batadv_unicast_packet *)skb->data;
+- unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
+- ethhdr = eth_hdr(skb);
+-
+ is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR;
+ /* the caller function should have already pulled 2 bytes */
+ if (is4addr)
+@@ -995,12 +991,14 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
+ if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size))
+ goto free_skb;
+
++ unicast_packet = (struct batadv_unicast_packet *)skb->data;
++
+ /* packet for me */
+ if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
+ /* If this is a unicast packet from another backgone gw,
+ * drop it.
+ */
+- orig_addr_gw = ethhdr->h_source;
++ orig_addr_gw = eth_hdr(skb)->h_source;
+ orig_node_gw = batadv_orig_hash_find(bat_priv, orig_addr_gw);
+ if (orig_node_gw) {
+ is_gw = batadv_bla_is_backbone_gw(skb, orig_node_gw,
+@@ -1015,6 +1013,8 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
+ }
+
+ if (is4addr) {
++ unicast_4addr_packet =
++ (struct batadv_unicast_4addr_packet *)skb->data;
+ subtype = unicast_4addr_packet->subtype;
+ batadv_dat_inc_counter(bat_priv, subtype);
+
+--
+2.16.2
+
diff --git a/batman-adv/patches/1002-batman-adv-fix-header-size-check-in-batadv_dbg_arp.patch b/batman-adv/patches/1002-batman-adv-fix-header-size-check-in-batadv_dbg_arp.patch
new file mode 100644
index 0000000000000000000000000000000000000000..efb0a00f5cf0f9f43a1147ab380c4a4e2a122a54
--- /dev/null
+++ b/batman-adv/patches/1002-batman-adv-fix-header-size-check-in-batadv_dbg_arp.patch
@@ -0,0 +1,34 @@
+From 3cc8fb9bb6b983a5b7972af2fd803041095d8c90 Mon Sep 17 00:00:00 2001
+Message-Id: <3cc8fb9bb6b983a5b7972af2fd803041095d8c90.1521225964.git.mschiffer@universe-factory.net>
+In-Reply-To: <b512c268fbe9f9d61eadc579457d6b825fcf3638.1521225964.git.mschiffer@universe-factory.net>
+References: <b512c268fbe9f9d61eadc579457d6b825fcf3638.1521225964.git.mschiffer@universe-factory.net>
+From: Matthias Schiffer <mschiffer@universe-factory.net>
+Date: Thu, 15 Mar 2018 12:41:56 +0100
+Subject: [PATCH 1002/1003] batman-adv: fix header size check in
+ batadv_dbg_arp()
+
+Checking for 0 is insufficient: when an SKB without a batadv header, but
+with a VLAN header is received, hdr_size will be 4, making the following
+code interpret the Ethernet header as a batadv header.
+
+Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
+---
+ net/batman-adv/distributed-arp-table.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
+index 19b15de455ab..b7ca4a311b91 100644
+--- a/net/batman-adv/distributed-arp-table.c
++++ b/net/batman-adv/distributed-arp-table.c
+@@ -393,7 +393,7 @@ static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb,
+ batadv_arp_hw_src(skb, hdr_size), &ip_src,
+ batadv_arp_hw_dst(skb, hdr_size), &ip_dst);
+
+- if (hdr_size == 0)
++ if (hdr_size < sizeof(struct batadv_unicast_packet))
+ return;
+
+ unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
+--
+2.16.2
+
diff --git a/batman-adv/patches/1003-batman-adv-do-not-modify-batadv-packet-header-before.patch b/batman-adv/patches/1003-batman-adv-do-not-modify-batadv-packet-header-before.patch
new file mode 100644
index 0000000000000000000000000000000000000000..e5420db8bff08b25b05dc6a166dc7d745493492a
--- /dev/null
+++ b/batman-adv/patches/1003-batman-adv-do-not-modify-batadv-packet-header-before.patch
@@ -0,0 +1,178 @@
+From c09f296ac6e85467147096e656d12ddf05713216 Mon Sep 17 00:00:00 2001
+Message-Id: <c09f296ac6e85467147096e656d12ddf05713216.1521225964.git.mschiffer@universe-factory.net>
+In-Reply-To: <b512c268fbe9f9d61eadc579457d6b825fcf3638.1521225964.git.mschiffer@universe-factory.net>
+References: <b512c268fbe9f9d61eadc579457d6b825fcf3638.1521225964.git.mschiffer@universe-factory.net>
+From: Matthias Schiffer <mschiffer@universe-factory.net>
+Date: Thu, 15 Mar 2018 13:16:56 +0100
+Subject: [PATCH 1003/1003] batman-adv: do not modify batadv packet header
+ before pulling it
+
+batadv_check_unicast_ttvn() may modify the batadv header, leading to
+checksum errors in the following processing of the packet.
+
+Rather than fixing up the checksum, simply pull the batadv header before
+modifying it (and push it back in case the packet is rerouted).
+
+Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
+---
+ net/batman-adv/routing.c | 38 +++++++++++++++++++++-----------------
+ net/batman-adv/soft-interface.c | 10 ++--------
+ net/batman-adv/soft-interface.h | 2 +-
+ 3 files changed, 24 insertions(+), 26 deletions(-)
+
+diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
+index 0f10c565ac85..37b87fce685b 100644
+--- a/net/batman-adv/routing.c
++++ b/net/batman-adv/routing.c
+@@ -824,16 +824,16 @@ static bool batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
+ int is_old_ttvn;
+
+ /* check if there is enough data before accessing it */
+- if (!pskb_may_pull(skb, hdr_len + ETH_HLEN))
++ if (!pskb_may_pull(skb, ETH_HLEN))
+ return false;
+
+ /* create a copy of the skb (in case of for re-routing) to modify it. */
+- if (skb_cow(skb, sizeof(*unicast_packet)) < 0)
++ if (skb_cow_head(skb, ETH_HLEN + hdr_len) < 0)
+ return false;
+
+- unicast_packet = (struct batadv_unicast_packet *)skb->data;
+- vid = batadv_get_vid(skb, hdr_len);
+- ethhdr = (struct ethhdr *)(skb->data + hdr_len);
++ unicast_packet = (struct batadv_unicast_packet *)(skb->data - hdr_len);
++ vid = batadv_get_vid(skb, 0);
++ ethhdr = (struct ethhdr *)skb->data;
+
+ /* check if the destination client was served by this node and it is now
+ * roaming. In this case, it means that the node has got a ROAM_ADV
+@@ -985,13 +985,16 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
+ */
+ if (check == -EREMOTE)
+ batadv_nc_skb_store_sniffed_unicast(bat_priv, skb);
+-
+ if (check < 0)
+ goto free_skb;
++
++ /* batadv_check_unicast_packet has checked if we may pull */
++ skb_pull_rcsum(skb, hdr_size);
++
+ if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size))
+ goto free_skb;
+
+- unicast_packet = (struct batadv_unicast_packet *)skb->data;
++ unicast_packet = (struct batadv_unicast_packet *)(skb->data - hdr_size);
+
+ /* packet for me */
+ if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
+@@ -1001,8 +1004,7 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
+ orig_addr_gw = eth_hdr(skb)->h_source;
+ orig_node_gw = batadv_orig_hash_find(bat_priv, orig_addr_gw);
+ if (orig_node_gw) {
+- is_gw = batadv_bla_is_backbone_gw(skb, orig_node_gw,
+- hdr_size);
++ is_gw = batadv_bla_is_backbone_gw(skb, orig_node_gw, 0);
+ batadv_orig_node_put(orig_node_gw);
+ if (is_gw) {
+ batadv_dbg(BATADV_DBG_BLA, bat_priv,
+@@ -1014,7 +1016,8 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
+
+ if (is4addr) {
+ unicast_4addr_packet =
+- (struct batadv_unicast_4addr_packet *)skb->data;
++ (struct batadv_unicast_4addr_packet *)
++ unicast_packet;
+ subtype = unicast_4addr_packet->subtype;
+ batadv_dat_inc_counter(bat_priv, subtype);
+
+@@ -1031,15 +1034,12 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
+ }
+ }
+
+- if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb,
+- hdr_size))
++ if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, 0))
+ goto rx_success;
+- if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb,
+- hdr_size))
++ if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, 0))
+ goto rx_success;
+
+- batadv_interface_rx(recv_if->soft_iface, skb, hdr_size,
+- orig_node);
++ batadv_interface_rx(recv_if->soft_iface, skb, false, orig_node);
+
+ rx_success:
+ if (orig_node)
+@@ -1048,6 +1048,8 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
+ return NET_RX_SUCCESS;
+ }
+
++ skb_push_rcsum(skb, hdr_size);
++
+ ret = batadv_route_unicast_packet(skb, recv_if);
+ /* skb was consumed */
+ skb = NULL;
+@@ -1273,8 +1275,10 @@ int batadv_recv_bcast_packet(struct sk_buff *skb,
+ if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size))
+ goto rx_success;
+
++ skb_pull_rcsum(skb, hdr_size);
++
+ /* broadcast for me */
+- batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, orig_node);
++ batadv_interface_rx(recv_if->soft_iface, skb, true, orig_node);
+
+ rx_success:
+ ret = NET_RX_SUCCESS;
+diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
+index edeffcb9f3a2..370770759bb8 100644
+--- a/net/batman-adv/soft-interface.c
++++ b/net/batman-adv/soft-interface.c
+@@ -400,7 +400,7 @@ static int batadv_interface_tx(struct sk_buff *skb,
+ * batadv_interface_rx() - receive ethernet frame on local batman-adv interface
+ * @soft_iface: local interface which will receive the ethernet frame
+ * @skb: ethernet frame for @soft_iface
+- * @hdr_size: size of already parsed batman-adv header
++ * @is_bcast: true if the received frame is a batman-adv broadcast
+ * @orig_node: originator from which the batman-adv packet was sent
+ *
+ * Sends a ethernet frame to the receive path of the local @soft_iface.
+@@ -414,20 +414,14 @@ static int batadv_interface_tx(struct sk_buff *skb,
+ * isolated clients.
+ */
+ void batadv_interface_rx(struct net_device *soft_iface,
+- struct sk_buff *skb, int hdr_size,
++ struct sk_buff *skb, bool is_bcast,
+ struct batadv_orig_node *orig_node)
+ {
+- struct batadv_bcast_packet *batadv_bcast_packet;
+ struct batadv_priv *bat_priv = netdev_priv(soft_iface);
+ struct vlan_ethhdr *vhdr;
+ struct ethhdr *ethhdr;
+ unsigned short vid;
+- bool is_bcast;
+
+- batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
+- is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST);
+-
+- skb_pull_rcsum(skb, hdr_size);
+ skb_reset_mac_header(skb);
+
+ /* clean the netfilter state now that the batman-adv header has been
+diff --git a/net/batman-adv/soft-interface.h b/net/batman-adv/soft-interface.h
+index daf87f07fadd..53071d45093a 100644
+--- a/net/batman-adv/soft-interface.h
++++ b/net/batman-adv/soft-interface.h
+@@ -30,7 +30,7 @@ struct sk_buff;
+
+ int batadv_skb_head_push(struct sk_buff *skb, unsigned int len);
+ void batadv_interface_rx(struct net_device *soft_iface,
+- struct sk_buff *skb, int hdr_size,
++ struct sk_buff *skb, bool is_bcast,
+ struct batadv_orig_node *orig_node);
+ struct net_device *batadv_softif_create(struct net *net, const char *name);
+ void batadv_softif_destroy_sysfs(struct net_device *soft_iface);
+--
+2.16.2
+
diff --git a/batman-adv/patches/900-unaligned-access.patch b/batman-adv/patches/900-unaligned-access.patch
deleted file mode 100644
index eb067329bc5e9f112b56d03c20c612fb1fd1e32d..0000000000000000000000000000000000000000
--- a/batman-adv/patches/900-unaligned-access.patch
+++ /dev/null
@@ -1,87 +0,0 @@
-From: Matthias Schiffer <mschiffer@universe-factory.net>
-Date: Wed, 24 Jan 2018 11:21:37 +0000 (+0100)
-Subject: batman-adv: always assume 2-byte packet alignment
-X-Git-Url: https://git.open-mesh.org/batman-adv.git/commitdiff_plain/0509fc0c128ba2891770305c57c9b6a3a61ea7bd
-
-batman-adv: always assume 2-byte packet alignment
-
-NIC drivers generally try to ensure that the "network header" is aligned
-to a 4-byte boundary. This is not always possible: When Ethernet frames are
-encapsulated in other packets with 4-byte aligned headers, the inner
-Ethernet header will have 4-byte alignment, and in consequence, the inner
-network header is aligned to 2, but not to 4 bytes.
-
-Most parts of batman-adv only care about 2-byte alignment; in particular,
-no unaligned accesses occur in performance-critical paths that handle
-actual payload data. This is not true for OGM handling: the seqno and crc
-fields are accessed as 32-bit values. To avoid these unaligned accesses,
-this patch reduces the expected packet alignment to 2 bytes for all of
-batadv's packet types.
-
-As no unaligned accesses existed on the performance-critical paths anyways,
-this chance does have any (positive or negative) effect on performance, but
-it still makes sense to avoid these accesses to prevent log noise when
-examining other unaligned accesses in the kernel while batman-adv is
-active.
-
-Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
-Signed-off-by: Sven Eckelmann <sven@narfation.org>
----
-
-diff --git a/include/uapi/linux/batadv_packet.h b/include/uapi/linux/batadv_packet.h
-index daefd72..894d8d2 100644
---- a/include/uapi/linux/batadv_packet.h
-+++ b/include/uapi/linux/batadv_packet.h
-@@ -196,8 +196,6 @@ struct batadv_bla_claim_dst {
- __be16 group; /* group id */
- };
-
--#pragma pack()
--
- /**
- * struct batadv_ogm_packet - ogm (routing protocol) packet
- * @packet_type: batman-adv packet type, part of the general header
-@@ -222,9 +220,6 @@ struct batadv_ogm_packet {
- __u8 reserved;
- __u8 tq;
- __be16 tvlv_len;
-- /* __packed is not needed as the struct size is divisible by 4,
-- * and the largest data type in this struct has a size of 4.
-- */
- };
-
- #define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet)
-@@ -249,9 +244,6 @@ struct batadv_ogm2_packet {
- __u8 orig[ETH_ALEN];
- __be16 tvlv_len;
- __be32 throughput;
-- /* __packed is not needed as the struct size is divisible by 4,
-- * and the largest data type in this struct has a size of 4.
-- */
- };
-
- #define BATADV_OGM2_HLEN sizeof(struct batadv_ogm2_packet)
-@@ -405,7 +397,6 @@ struct batadv_icmp_packet_rr {
- * misalignment of the payload after the ethernet header. It may also lead to
- * leakage of information when the padding it not initialized before sending.
- */
--#pragma pack(2)
-
- /**
- * struct batadv_unicast_packet - unicast packet for network payload
-@@ -533,8 +524,6 @@ struct batadv_coded_packet {
- __be16 coded_len;
- };
-
--#pragma pack()
--
- /**
- * struct batadv_unicast_tvlv_packet - generic unicast packet with tvlv payload
- * @packet_type: batman-adv packet type, part of the general header
-@@ -641,4 +630,6 @@ struct batadv_tvlv_mcast_data {
- __u8 reserved[3];
- };
-
-+#pragma pack()
-+
- #endif /* _UAPI_LINUX_BATADV_PACKET_H_ */
diff --git a/batman-adv/patches/9000-unaligned-access.patch b/batman-adv/patches/9000-unaligned-access.patch
new file mode 100644
index 0000000000000000000000000000000000000000..eb067329bc5e9f112b56d03c20c612fb1fd1e32d
--- /dev/null
+++ b/batman-adv/patches/9000-unaligned-access.patch
@@ -0,0 +1,87 @@
+From: Matthias Schiffer <mschiffer@universe-factory.net>
+Date: Wed, 24 Jan 2018 11:21:37 +0000 (+0100)
+Subject: batman-adv: always assume 2-byte packet alignment
+X-Git-Url: https://git.open-mesh.org/batman-adv.git/commitdiff_plain/0509fc0c128ba2891770305c57c9b6a3a61ea7bd
+
+batman-adv: always assume 2-byte packet alignment
+
+NIC drivers generally try to ensure that the "network header" is aligned
+to a 4-byte boundary. This is not always possible: When Ethernet frames are
+encapsulated in other packets with 4-byte aligned headers, the inner
+Ethernet header will have 4-byte alignment, and in consequence, the inner
+network header is aligned to 2, but not to 4 bytes.
+
+Most parts of batman-adv only care about 2-byte alignment; in particular,
+no unaligned accesses occur in performance-critical paths that handle
+actual payload data. This is not true for OGM handling: the seqno and crc
+fields are accessed as 32-bit values. To avoid these unaligned accesses,
+this patch reduces the expected packet alignment to 2 bytes for all of
+batadv's packet types.
+
+As no unaligned accesses existed on the performance-critical paths anyways,
+this chance does have any (positive or negative) effect on performance, but
+it still makes sense to avoid these accesses to prevent log noise when
+examining other unaligned accesses in the kernel while batman-adv is
+active.
+
+Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+---
+
+diff --git a/include/uapi/linux/batadv_packet.h b/include/uapi/linux/batadv_packet.h
+index daefd72..894d8d2 100644
+--- a/include/uapi/linux/batadv_packet.h
++++ b/include/uapi/linux/batadv_packet.h
+@@ -196,8 +196,6 @@ struct batadv_bla_claim_dst {
+ __be16 group; /* group id */
+ };
+
+-#pragma pack()
+-
+ /**
+ * struct batadv_ogm_packet - ogm (routing protocol) packet
+ * @packet_type: batman-adv packet type, part of the general header
+@@ -222,9 +220,6 @@ struct batadv_ogm_packet {
+ __u8 reserved;
+ __u8 tq;
+ __be16 tvlv_len;
+- /* __packed is not needed as the struct size is divisible by 4,
+- * and the largest data type in this struct has a size of 4.
+- */
+ };
+
+ #define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet)
+@@ -249,9 +244,6 @@ struct batadv_ogm2_packet {
+ __u8 orig[ETH_ALEN];
+ __be16 tvlv_len;
+ __be32 throughput;
+- /* __packed is not needed as the struct size is divisible by 4,
+- * and the largest data type in this struct has a size of 4.
+- */
+ };
+
+ #define BATADV_OGM2_HLEN sizeof(struct batadv_ogm2_packet)
+@@ -405,7 +397,6 @@ struct batadv_icmp_packet_rr {
+ * misalignment of the payload after the ethernet header. It may also lead to
+ * leakage of information when the padding it not initialized before sending.
+ */
+-#pragma pack(2)
+
+ /**
+ * struct batadv_unicast_packet - unicast packet for network payload
+@@ -533,8 +524,6 @@ struct batadv_coded_packet {
+ __be16 coded_len;
+ };
+
+-#pragma pack()
+-
+ /**
+ * struct batadv_unicast_tvlv_packet - generic unicast packet with tvlv payload
+ * @packet_type: batman-adv packet type, part of the general header
+@@ -641,4 +630,6 @@ struct batadv_tvlv_mcast_data {
+ __u8 reserved[3];
+ };
+
++#pragma pack()
++
+ #endif /* _UAPI_LINUX_BATADV_PACKET_H_ */