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Diffstat (limited to 'net/batman-adv/distributed-arp-table.c')
-rw-r--r--net/batman-adv/distributed-arp-table.c84
1 files changed, 46 insertions, 38 deletions
diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index e257efdc5d03..49576c5a3fe3 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -369,12 +369,11 @@ out:
* batadv_dbg_arp - print a debug message containing all the ARP packet details
* @bat_priv: the bat priv with all the soft interface information
* @skb: ARP packet
- * @type: ARP type
* @hdr_size: size of the possible header before the ARP packet
* @msg: message to print together with the debugging information
*/
static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb,
- u16 type, int hdr_size, char *msg)
+ int hdr_size, char *msg)
{
struct batadv_unicast_4addr_packet *unicast_4addr_packet;
struct batadv_bcast_packet *bcast_pkt;
@@ -441,7 +440,7 @@ static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb,
#else
static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb,
- u16 type, int hdr_size, char *msg)
+ int hdr_size, char *msg)
{
}
@@ -950,6 +949,41 @@ static unsigned short batadv_dat_get_vid(struct sk_buff *skb, int *hdr_size)
}
/**
+ * batadv_dat_arp_create_reply - create an ARP Reply
+ * @bat_priv: the bat priv with all the soft interface information
+ * @ip_src: ARP sender IP
+ * @ip_dst: ARP target IP
+ * @hw_src: Ethernet source and ARP sender MAC
+ * @hw_dst: Ethernet destination and ARP target MAC
+ * @vid: VLAN identifier (optional, set to zero otherwise)
+ *
+ * Creates an ARP Reply from the given values, optionally encapsulated in a
+ * VLAN header.
+ *
+ * Return: An skb containing an ARP Reply.
+ */
+static struct sk_buff *
+batadv_dat_arp_create_reply(struct batadv_priv *bat_priv, __be32 ip_src,
+ __be32 ip_dst, u8 *hw_src, u8 *hw_dst,
+ unsigned short vid)
+{
+ struct sk_buff *skb;
+
+ skb = arp_create(ARPOP_REPLY, ETH_P_ARP, ip_dst, bat_priv->soft_iface,
+ ip_src, hw_dst, hw_src, hw_dst);
+ if (!skb)
+ return NULL;
+
+ skb_reset_mac_header(skb);
+
+ if (vid & BATADV_VLAN_HAS_TAG)
+ skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
+ vid & VLAN_VID_MASK);
+
+ return skb;
+}
+
+/**
* batadv_dat_snoop_outgoing_arp_request - snoop the ARP request and try to
* answer using DAT
* @bat_priv: the bat priv with all the soft interface information
@@ -983,8 +1017,7 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
if (type != ARPOP_REQUEST)
goto out;
- batadv_dbg_arp(bat_priv, skb, type, hdr_size,
- "Parsing outgoing ARP REQUEST");
+ batadv_dbg_arp(bat_priv, skb, hdr_size, "Parsing outgoing ARP REQUEST");
ip_src = batadv_arp_ip_src(skb, hdr_size);
hw_src = batadv_arp_hw_src(skb, hdr_size);
@@ -1007,20 +1040,12 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
goto out;
}
- skb_new = arp_create(ARPOP_REPLY, ETH_P_ARP, ip_src,
- bat_priv->soft_iface, ip_dst, hw_src,
- dat_entry->mac_addr, hw_src);
+ skb_new = batadv_dat_arp_create_reply(bat_priv, ip_dst, ip_src,
+ dat_entry->mac_addr,
+ hw_src, vid);
if (!skb_new)
goto out;
- if (vid & BATADV_VLAN_HAS_TAG) {
- skb_new = vlan_insert_tag(skb_new, htons(ETH_P_8021Q),
- vid & VLAN_VID_MASK);
- if (!skb_new)
- goto out;
- }
-
- skb_reset_mac_header(skb_new);
skb_new->protocol = eth_type_trans(skb_new,
bat_priv->soft_iface);
bat_priv->stats.rx_packets++;
@@ -1075,8 +1100,7 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
ip_src = batadv_arp_ip_src(skb, hdr_size);
ip_dst = batadv_arp_ip_dst(skb, hdr_size);
- batadv_dbg_arp(bat_priv, skb, type, hdr_size,
- "Parsing incoming ARP REQUEST");
+ batadv_dbg_arp(bat_priv, skb, hdr_size, "Parsing incoming ARP REQUEST");
batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid);
@@ -1084,25 +1108,11 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
if (!dat_entry)
goto out;
- skb_new = arp_create(ARPOP_REPLY, ETH_P_ARP, ip_src,
- bat_priv->soft_iface, ip_dst, hw_src,
- dat_entry->mac_addr, hw_src);
-
+ skb_new = batadv_dat_arp_create_reply(bat_priv, ip_dst, ip_src,
+ dat_entry->mac_addr, hw_src, vid);
if (!skb_new)
goto out;
- /* the rest of the TX path assumes that the mac_header offset pointing
- * to the inner Ethernet header has been set, therefore reset it now.
- */
- skb_reset_mac_header(skb_new);
-
- if (vid & BATADV_VLAN_HAS_TAG) {
- skb_new = vlan_insert_tag(skb_new, htons(ETH_P_8021Q),
- vid & VLAN_VID_MASK);
- if (!skb_new)
- goto out;
- }
-
/* To preserve backwards compatibility, the node has choose the outgoing
* format based on the incoming request packet type. The assumption is
* that a node not using the 4addr packet format doesn't support it.
@@ -1149,8 +1159,7 @@ void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
if (type != ARPOP_REPLY)
return;
- batadv_dbg_arp(bat_priv, skb, type, hdr_size,
- "Parsing outgoing ARP REPLY");
+ batadv_dbg_arp(bat_priv, skb, hdr_size, "Parsing outgoing ARP REPLY");
hw_src = batadv_arp_hw_src(skb, hdr_size);
ip_src = batadv_arp_ip_src(skb, hdr_size);
@@ -1195,8 +1204,7 @@ bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
if (type != ARPOP_REPLY)
goto out;
- batadv_dbg_arp(bat_priv, skb, type, hdr_size,
- "Parsing incoming ARP REPLY");
+ batadv_dbg_arp(bat_priv, skb, hdr_size, "Parsing incoming ARP REPLY");
hw_src = batadv_arp_hw_src(skb, hdr_size);
ip_src = batadv_arp_ip_src(skb, hdr_size);