[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>

1 files changed, 12 insertions, 8 deletions

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 00caf4b318b2..56a20f014b8a 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -100,6 +100,7 @@ static const int rtm_min[RTM_NR_FAMILIES] =
         [RTM_FAM(RTM_NEWPREFIX)]    = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
         [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
         [RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
+        [RTM_FAM(RTM_NEWNEIGHTBL)]  = NLMSG_LENGTH(sizeof(struct ndtmsg)),
 };
 
 static const int rta_max[RTM_NR_FAMILIES] =
@@ -113,6 +114,7 @@ static const int rta_max[RTM_NR_FAMILIES] =
         [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
         [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
         [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
+        [RTM_FAM(RTM_NEWNEIGHTBL)]  = NDTA_MAX,
 };
 
 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
@@ -649,14 +651,16 @@ static void rtnetlink_rcv(struct sock *sk, int len)
 
 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
 {
-        [RTM_GETLINK  - RTM_BASE] = { .dumpit = rtnetlink_dump_ifinfo },
-        [RTM_SETLINK  - RTM_BASE] = { .doit   = do_setlink            },
-        [RTM_GETADDR  - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
-        [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
-        [RTM_NEWNEIGH - RTM_BASE] = { .doit   = neigh_add             },
-        [RTM_DELNEIGH - RTM_BASE] = { .doit   = neigh_delete          },
-        [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info       },
-        [RTM_GETRULE  - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
+        [RTM_GETLINK     - RTM_BASE] = { .dumpit = rtnetlink_dump_ifinfo },
+        [RTM_SETLINK     - RTM_BASE] = { .doit   = do_setlink            },
+        [RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
+        [RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
+        [RTM_NEWNEIGH    - RTM_BASE] = { .doit   = neigh_add             },
+        [RTM_DELNEIGH    - RTM_BASE] = { .doit   = neigh_delete          },
+        [RTM_GETNEIGH    - RTM_BASE] = { .dumpit = neigh_dump_info       },
+        [RTM_GETRULE     - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
+        [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info    },
+        [RTM_SETNEIGHTBL - RTM_BASE] = { .doit   = neightbl_set          },
 };
 
 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)