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authorRobert Olsson <Robert.Olsson@data.slu.se>2005-06-20 13:36:39 -0700
committerDavid S. Miller <davem@davemloft.net>2005-06-20 13:36:39 -0700
commit246955fe4c38bd706ae30e37c64892c94213775d (patch)
tree23583698ce7c58e1643414245690afca33618540
parentf6e276ee67c0ac9efafd24bc6f7a84aa359656df (diff)
downloadop-kernel-dev-246955fe4c38bd706ae30e37c64892c94213775d.zip
op-kernel-dev-246955fe4c38bd706ae30e37c64892c94213775d.tar.gz
[NETLINK]: fib_lookup() via netlink
Below is a more generic patch to do fib_lookup via netlink. For others we should say that we discussed this as a way to verify route selection. It's also possible there are others uses for this. In short the fist half of struct fib_result_nl is filled in by caller and netlink call fills in the other half and returns it. In case anyone is interested there is a corresponding user app to compare the full routing table this was used to test implementation of the LC-trie. Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/linux/netlink.h1
-rw-r--r--include/net/ip_fib.h14
-rw-r--r--net/ipv4/fib_frontend.c55
3 files changed, 70 insertions, 0 deletions
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index e38407a..561d4dc 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -14,6 +14,7 @@
#define NETLINK_SELINUX 7 /* SELinux event notifications */
#define NETLINK_ARPD 8
#define NETLINK_AUDIT 9 /* auditing */
+#define NETLINK_FIB_LOOKUP 10
#define NETLINK_ROUTE6 11 /* af_inet6 route comm channel */
#define NETLINK_IP6_FW 13
#define NETLINK_DNRTMSG 14 /* DECnet routing messages */
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index e5a5f6b..a4208a3 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -109,6 +109,20 @@ struct fib_result {
#endif
};
+struct fib_result_nl {
+ u32 fl_addr; /* To be looked up*/
+ u32 fl_fwmark;
+ unsigned char fl_tos;
+ unsigned char fl_scope;
+ unsigned char tb_id_in;
+
+ unsigned char tb_id; /* Results */
+ unsigned char prefixlen;
+ unsigned char nh_sel;
+ unsigned char type;
+ unsigned char scope;
+ int err;
+};
#ifdef CONFIG_IP_ROUTE_MULTIPATH
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 563e7d6..cd8e45a 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -516,6 +516,60 @@ static void fib_del_ifaddr(struct in_ifaddr *ifa)
#undef BRD1_OK
}
+static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb )
+{
+
+ struct fib_result res;
+ struct flowi fl = { .nl_u = { .ip4_u = { .daddr = frn->fl_addr,
+ .fwmark = frn->fl_fwmark,
+ .tos = frn->fl_tos,
+ .scope = frn->fl_scope } } };
+ if (tb) {
+ local_bh_disable();
+
+ frn->tb_id = tb->tb_id;
+ frn->err = tb->tb_lookup(tb, &fl, &res);
+
+ if (!frn->err) {
+ frn->prefixlen = res.prefixlen;
+ frn->nh_sel = res.nh_sel;
+ frn->type = res.type;
+ frn->scope = res.scope;
+ }
+ local_bh_enable();
+ }
+}
+
+static void nl_fib_input(struct sock *sk, int len)
+{
+ struct sk_buff *skb = NULL;
+ struct nlmsghdr *nlh = NULL;
+ struct fib_result_nl *frn;
+ int err;
+ u32 pid;
+ struct fib_table *tb;
+
+ skb = skb_recv_datagram(sk, 0, 0, &err);
+ nlh = (struct nlmsghdr *)skb->data;
+
+ frn = (struct fib_result_nl *) NLMSG_DATA(nlh);
+ tb = fib_get_table(frn->tb_id_in);
+
+ nl_fib_lookup(frn, tb);
+
+ pid = nlh->nlmsg_pid; /*pid of sending process */
+ NETLINK_CB(skb).groups = 0; /* not in mcast group */
+ NETLINK_CB(skb).pid = 0; /* from kernel */
+ NETLINK_CB(skb).dst_pid = pid;
+ NETLINK_CB(skb).dst_groups = 0; /* unicast */
+ netlink_unicast(sk, skb, pid, MSG_DONTWAIT);
+}
+
+static void nl_fib_lookup_init(void)
+{
+ netlink_kernel_create(NETLINK_FIB_LOOKUP, nl_fib_input);
+}
+
static void fib_disable_ip(struct net_device *dev, int force)
{
if (fib_sync_down(0, dev, force))
@@ -604,6 +658,7 @@ void __init ip_fib_init(void)
register_netdevice_notifier(&fib_netdev_notifier);
register_inetaddr_notifier(&fib_inetaddr_notifier);
+ nl_fib_lookup_init();
}
EXPORT_SYMBOL(inet_addr_type);
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