Subject: [PATCH] [AX25] [ROSE] rose_get_route()

[pidoux <bpidoux@free.fr>]

 From c2a2edd975669614e7e0a890800fd6a92850771f Mon Sep 17 00:00:00 2001
From: Bernard Pidoux <f6bvp@amsat.org>
Date: Thu, 24 Apr 2008 00:48:07 +0200
Subject: [PATCH] [AX25] [ROSE] rose_get_route()

This patch offers a new function named rose_get_route(), called
  by rose_route_frame() in order to find a route each time a packet
  must be routed toward a specific address handled by one of the adjacent
  nodes in a list.

It returns the address of the adjacent node if it is connected,
otherwise it returns a NULL. In that case, the calling function
will initiate a new connection as before, when it was calling
rose_get_neigh().

This function has been tested for months now and it works fine.
It adds a fast automatic frame routing mechanism from nodes to nodes,
while identifaction of packets remains all along with callsigns
of calling and destination AX25 stations.

Signed-off-by: Bernard Pidoux <f6bvp@amsat.org>
---
  include/net/rose.h    |    1 +
  net/rose/rose_route.c |   30 +++++++++++++++++++++++++++---
  2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/include/net/rose.h b/include/net/rose.h
index e5bb084..de88459 100644
--- a/include/net/rose.h
+++ b/include/net/rose.h
@@ -201,6 +201,7 @@ extern void rose_link_device_down(struct net_device *);
  extern struct net_device *rose_dev_first(void);
  extern struct net_device *rose_dev_get(rose_address *);
  extern struct rose_route *rose_route_free_lci(unsigned int, struct 
rose_neigh *);
+extern struct rose_neigh *rose_get_route(rose_address *);
  extern struct rose_neigh *rose_get_neigh(rose_address *, unsigned char 
*, unsigned char *);
  extern int  rose_rt_ioctl(unsigned int, void __user *);
  extern void rose_link_failed(ax25_cb *, int);
diff --git a/net/rose/rose_route.c b/net/rose/rose_route.c
index 5053a53..ad0ebdc 100644
--- a/net/rose/rose_route.c
+++ b/net/rose/rose_route.c
@@ -662,6 +662,31 @@ struct rose_route *rose_route_free_lci(unsigned int 
lci, struct rose_neigh *neig
  }

  /*
+ *	Find an opened route given a ROSE address.
+ */
+struct rose_neigh *rose_get_route(rose_address *addr)
+{
+	struct rose_node *node;
+	struct rose_neigh *res = NULL;
+	int i;
+
+	spin_lock_bh(&rose_node_list_lock);
+	for (node = rose_node_list; node != NULL; node = node->next) {
+		if (rosecmpm(addr, &node->address, node->mask) == 0) {
+			for (i = 0; i < node->count; i++) {
+				if (node->neighbour[i]->restarted) {
+					res = node->neighbour[i];
+					goto out;
+				}
+			}
+		}
+	}
+out:
+	spin_unlock_bh(&rose_node_list_lock);
+	return res;
+}
+
+/*
   *	Find a neighbour given a ROSE address.
   */
  struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char 
*cause,
@@ -842,7 +867,6 @@ int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
  	struct sock *sk;
  	unsigned short frametype;
  	unsigned int lci, new_lci;
-	unsigned char cause, diagnostic;
  	struct net_device *dev;
  	int len, res = 0;
  	char buf[11];
@@ -1018,8 +1042,8 @@ int rose_route_frame(struct sk_buff *skb, ax25_cb 
*ax25)
  		rose_route = rose_route->next;
  	}

-	if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic)) == 
NULL) {
-		rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
+	if ((new_neigh = rose_get_route(dest_addr)) == NULL) {
+		rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
  		goto out;
  	}

-- 1.5.5