[NETLINK]: Neighbour table configuration and statistics via rtnetlink

To retrieve the neighbour tables send RTM_GETNEIGHTBL with the
NLM_F_DUMP flag set. Every neighbour table configuration is
spread over multiple messages to avoid running into message
size limits on systems with many interfaces. The first message
in the sequence transports all not device specific data such as
statistics, configuration, and the default parameter set.
This message is followed by 0..n messages carrying device
specific parameter sets.

Although the ordering should be sufficient, NDTA_NAME can be
used to identify sequences. The initial message can be identified
by checking for NDTA_CONFIG. The device specific messages do
not contain this TLV but have NDTPA_IFINDEX set to the
corresponding interface index.

To change neighbour table attributes, send RTM_SETNEIGHTBL
with NDTA_NAME set. Changeable attribute include NDTA_THRESH[1-3],
NDTA_GC_INTERVAL, and all TLVs in NDTA_PARMS unless marked
otherwise. Device specific parameter sets can be changed by
setting NDTPA_IFINDEX to the interface index of the corresponding
device.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 111 insertions, 0 deletions

diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index a09b5d42babf..5a5cda160267 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -89,6 +89,13 @@ enum {
         RTM_GETANYCAST  = 62,
 #define RTM_GETANYCAST  RTM_GETANYCAST
 
+        RTM_NEWNEIGHTBL = 64,
+#define RTM_NEWNEIGHTBL RTM_NEWNEIGHTBL
+        RTM_GETNEIGHTBL = 66,
+#define RTM_GETNEIGHTBL RTM_GETNEIGHTBL
+        RTM_SETNEIGHTBL,
+#define RTM_SETNEIGHTBL RTM_SETNEIGHTBL
+
         __RTM_MAX,
 #define RTM_MAX         (((__RTM_MAX + 3) & ~3) - 1)
 };
@@ -493,6 +500,106 @@ struct nda_cacheinfo
         __u32           ndm_refcnt;
 };
 
+
+/*****************************************************************
+ *              Neighbour tables specific messages.
+ *
+ * To retrieve the neighbour tables send RTM_GETNEIGHTBL with the
+ * NLM_F_DUMP flag set. Every neighbour table configuration is
+ * spread over multiple messages to avoid running into message
+ * size limits on systems with many interfaces. The first message
+ * in the sequence transports all not device specific data such as
+ * statistics, configuration, and the default parameter set.
+ * This message is followed by 0..n messages carrying device
+ * specific parameter sets.
+ * Although the ordering should be sufficient, NDTA_NAME can be
+ * used to identify sequences. The initial message can be identified
+ * by checking for NDTA_CONFIG. The device specific messages do
+ * not contain this TLV but have NDTPA_IFINDEX set to the
+ * corresponding interface index.
+ *
+ * To change neighbour table attributes, send RTM_SETNEIGHTBL
+ * with NDTA_NAME set. Changeable attribute include NDTA_THRESH[1-3],
+ * NDTA_GC_INTERVAL, and all TLVs in NDTA_PARMS unless marked
+ * otherwise. Device specific parameter sets can be changed by
+ * setting NDTPA_IFINDEX to the interface index of the corresponding
+ * device.
+ ****/
+
+struct ndt_stats
+{
+        __u64           ndts_allocs;
+        __u64           ndts_destroys;
+        __u64           ndts_hash_grows;
+        __u64           ndts_res_failed;
+        __u64           ndts_lookups;
+        __u64           ndts_hits;
+        __u64           ndts_rcv_probes_mcast;
+        __u64           ndts_rcv_probes_ucast;
+        __u64           ndts_periodic_gc_runs;
+        __u64           ndts_forced_gc_runs;
+};
+
+enum {
+        NDTPA_UNSPEC,
+        NDTPA_IFINDEX,                  /* u32, unchangeable */
+        NDTPA_REFCNT,                   /* u32, read-only */
+        NDTPA_REACHABLE_TIME,           /* u64, read-only, msecs */
+        NDTPA_BASE_REACHABLE_TIME,      /* u64, msecs */
+        NDTPA_RETRANS_TIME,             /* u64, msecs */
+        NDTPA_GC_STALETIME,             /* u64, msecs */
+        NDTPA_DELAY_PROBE_TIME,         /* u64, msecs */
+        NDTPA_QUEUE_LEN,                /* u32 */
+        NDTPA_APP_PROBES,               /* u32 */
+        NDTPA_UCAST_PROBES,             /* u32 */
+        NDTPA_MCAST_PROBES,             /* u32 */
+        NDTPA_ANYCAST_DELAY,            /* u64, msecs */
+        NDTPA_PROXY_DELAY,              /* u64, msecs */
+        NDTPA_PROXY_QLEN,               /* u32 */
+        NDTPA_LOCKTIME,                 /* u64, msecs */
+        __NDTPA_MAX
+};
+#define NDTPA_MAX (__NDTPA_MAX - 1)
+
+struct ndtmsg
+{
+        __u8            ndtm_family;
+        __u8            ndtm_pad1;
+        __u16           ndtm_pad2;
+};
+
+struct ndt_config
+{
+        __u16           ndtc_key_len;
+        __u16           ndtc_entry_size;
+        __u32           ndtc_entries;
+        __u32           ndtc_last_flush;        /* delta to now in msecs */
+        __u32           ndtc_last_rand;         /* delta to now in msecs */
+        __u32           ndtc_hash_rnd;
+        __u32           ndtc_hash_mask;
+        __u32           ndtc_hash_chain_gc;
+        __u32           ndtc_proxy_qlen;
+};
+
+enum {
+        NDTA_UNSPEC,
+        NDTA_NAME,                      /* char *, unchangeable */
+        NDTA_THRESH1,                   /* u32 */
+        NDTA_THRESH2,                   /* u32 */
+        NDTA_THRESH3,                   /* u32 */
+        NDTA_CONFIG,                    /* struct ndt_config, read-only */
+        NDTA_PARMS,                     /* nested TLV NDTPA_* */
+        NDTA_STATS,                     /* struct ndt_stats, read-only */
+        NDTA_GC_INTERVAL,               /* u64, msecs */
+        __NDTA_MAX
+};
+#define NDTA_MAX (__NDTA_MAX - 1)
+
+#define NDTA_RTA(r) ((struct rtattr*)(((char*)(r)) + \
+                     NLMSG_ALIGN(sizeof(struct ndtmsg))))
+#define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ndtmsg))
+
+
 /****
  *              General form of address family dependent message.
  ****/
diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 4f33bbc21e7f..17191ac9be70 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -65,6 +65,7 @@ struct neighbour;
 
 struct neigh_parms
 {
+        struct net_device *dev;
         struct neigh_parms *next;
         int     (*neigh_setup)(struct neighbour *);
         struct neigh_table *tbl;
@@ -252,6 +253,9 @@ extern int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
 extern int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
 extern void neigh_app_ns(struct neighbour *n);
 
+extern int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb);
+extern int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
+
 extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie);
 extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *));
 extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_entry *));