@@ -30,6 +30,70 @@
#include "types.h"
#include "unicast.h"
+#ifdef CONFIG_BATMAN_ADV_DEBUG
+
+static void bat_dbg_arp(struct bat_priv *bat_priv, struct sk_buff *skb,
+ uint16_t type, int hdr_size, char *msg) {
+ struct unicast_4addr_packet *unicast_4addr_packet;
+
+ if (msg)
+ bat_dbg(DBG_ARP, bat_priv, "%s\n", msg);
+
+ bat_dbg(DBG_ARP, bat_priv, "ARP MSG = [src: %pM-%pI4 dst: %pM-%pI4]\n",
+ ARP_HW_SRC(skb, hdr_size), &ARP_IP_SRC(skb, hdr_size),
+ ARP_HW_DST(skb, hdr_size), &ARP_IP_DST(skb, hdr_size));
+
+ if (hdr_size == 0)
+ return;
+
+ /* if the AP packet is encapsulated in a batman packet, let's print some
+ * debug messages */
+ unicast_4addr_packet = (struct unicast_4addr_packet *)skb->data;
+
+ switch (unicast_4addr_packet->u.header.packet_type) {
+ case BAT_UNICAST:
+ bat_dbg(DBG_ARP, bat_priv, "* encapsulated within a UNICAST "
+ "packet\n");
+ break;
+ case BAT_UNICAST_4ADDR:
+ bat_dbg(DBG_ARP, bat_priv, "* encapsulated within a "
+ "UNICAST_4ADDR packet (src: %pM)\n",
+ unicast_4addr_packet->src);
+ switch (unicast_4addr_packet->subtype) {
+ case BAT_P_DAT_DHT_PUT:
+ bat_dbg(DBG_ARP, bat_priv, "* type: DAT_DHT_PUT\n");
+ break;
+ case BAT_P_DAT_DHT_GET:
+ bat_dbg(DBG_ARP, bat_priv, "* type: DAT_DHT_GET\n");
+ break;
+ case BAT_P_DAT_CACHE_REPLY:
+ bat_dbg(DBG_ARP, bat_priv, "* type: DAT_CACHE_REPLY\n");
+ break;
+ case BAT_P_DATA:
+ bat_dbg(DBG_ARP, bat_priv, "* type: DATA\n");
+ break;
+ default:
+ bat_dbg(DBG_ARP, bat_priv, "* type: Unknown!\n");
+ }
+ break;
+ case BAT_BCAST:
+ bat_dbg(DBG_ARP, bat_priv, "* encapsulated within a BCAST "
+ "packet (src: %pM)\n",
+ ((struct bcast_packet *)unicast_4addr_packet)->orig);
+ break;
+ default:
+ bat_dbg(DBG_ARP, bat_priv, "* encapsulated within an unknown "
+ "packet type (0x%x)\n",
+ unicast_4addr_packet->u.header.packet_type);
+ }
+}
+
+#else
+
+#define bat_dbg_arp(...)
+
+#endif /* CONFIG_BATMAN_ADV_DEBUG */
+
static bool is_orig_node_eligible(struct dht_candidate *res, int select,
dat_addr_t tmp_max, dat_addr_t max,
dat_addr_t last_max,
@@ -64,7 +128,6 @@ out:
return ret;
}
-
/* Given a key, selects the candidates which the DHT message has to be sent to.
* An originator O is selected if and only if its DHT_ID value is one of three
* closest values (from the LEFT, with wrap around if needed) then the hash
@@ -212,3 +275,55 @@ out:
kfree(cand);
return ret;
}
+
+/* Returns arphdr->ar_op if the skb contains a valid ARP packet, otherwise
+ * returns 0 */
+static uint16_t arp_get_type(struct bat_priv *bat_priv, struct sk_buff *skb,
+ int hdr_size)
+{
+ struct arphdr *arphdr;
+ struct ethhdr *ethhdr;
+ uint16_t type = 0;
+
+ /* pull the ethernet header */
+ if (unlikely(!pskb_may_pull(skb, hdr_size + ETH_HLEN)))
+ goto out;
+
+ ethhdr = (struct ethhdr *)(skb->data + hdr_size);
+
+ if (ethhdr->h_proto != htons(ETH_P_ARP))
+ goto out;
+
+ /* pull the ARP payload */
+ if (unlikely(!pskb_may_pull(skb, hdr_size + ETH_HLEN +
+ arp_hdr_len(skb->dev))))
+ goto out;
+
+ arphdr = (struct arphdr *)(skb->data + hdr_size + ETH_HLEN);
+
+ /* Check whether the ARP packet carries a valid
+ * IP information */
+ if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
+ goto out;
+
+ if (arphdr->ar_pro != htons(ETH_P_IP))
+ goto out;
+
+ if (arphdr->ar_hln != ETH_ALEN)
+ goto out;
+
+ if (arphdr->ar_pln != 4)
+ goto out;
+
+ /* Check for bad reply/request. If the ARP message is not sane, DAT
+ * will simply ignore it */
+ if (ipv4_is_loopback(ARP_IP_SRC(skb, hdr_size)) ||
+ ipv4_is_multicast(ARP_IP_SRC(skb, hdr_size)) ||
+ ipv4_is_loopback(ARP_IP_DST(skb, hdr_size)) ||
+ ipv4_is_multicast(ARP_IP_DST(skb, hdr_size)))
+ goto out;
+
+ type = ntohs(arphdr->ar_op);
+out:
+ return type;
+}
@@ -25,8 +25,18 @@
#include "types.h"
#include "originator.h"
+#include <linux/if_arp.h>
+
#define DAT_ADDR_MAX biggest_unsigned_int(dat_addr_t)
+#define ARP_HW_SRC(skb, hdr_size) ((uint8_t *)(skb->data + hdr_size) + \
+ ETH_HLEN + sizeof(struct arphdr))
+#define ARP_IP_SRC(skb, hdr_size) (*(uint32_t *)(ARP_HW_SRC(skb, hdr_size) + \
+ ETH_ALEN))
+#define ARP_HW_DST(skb, hdr_size) (ARP_HW_SRC(skb, hdr_size) + ETH_ALEN + 4)
+#define ARP_IP_DST(skb, hdr_size) (*(uint32_t *)(ARP_HW_SRC(skb, hdr_size) + \
+ ETH_ALEN * 2 + 4))
+
/* hash function to choose an entry in a hash table of given size */
/* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */
static inline uint32_t hash_ipv4(const void *data, uint32_t size)
@@ -37,7 +37,10 @@ enum bat_packettype {
};
enum bat_subtype {
- BAT_P_DATA = 0x01
+ BAT_P_DATA = 0x01,
+ BAT_P_DAT_DHT_GET = 0x02,
+ BAT_P_DAT_DHT_PUT = 0x03,
+ BAT_P_DAT_CACHE_REPLY = 0x04
};
/* this file is included by batctl which needs these defines */