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Diffstat (limited to 'net/x25/x25_forward.c')
-rw-r--r--net/x25/x25_forward.c88
1 files changed, 45 insertions, 43 deletions
diff --git a/net/x25/x25_forward.c b/net/x25/x25_forward.c
index d339e0c810a8..8738ec7ce693 100644
--- a/net/x25/x25_forward.c
+++ b/net/x25/x25_forward.c
@@ -26,64 +26,66 @@ int x25_forward_call(struct x25_address *dest_addr, struct x25_neigh *from,
26 short same_lci = 0; 26 short same_lci = 0;
27 int rc = 0; 27 int rc = 0;
28 28
29 if ((rt = x25_get_route(dest_addr)) != NULL) { 29 if ((rt = x25_get_route(dest_addr)) == NULL)
30 goto out_no_route;
30 31
31 if ((neigh_new = x25_get_neigh(rt->dev)) == NULL) { 32 if ((neigh_new = x25_get_neigh(rt->dev)) == NULL) {
32 /* This shouldnt happen, if it occurs somehow 33 /* This shouldnt happen, if it occurs somehow
33 * do something sensible 34 * do something sensible
34 */
35 goto out_put_route;
36 }
37
38 /* Avoid a loop. This is the normal exit path for a
39 * system with only one x.25 iface and default route
40 */ 35 */
41 if (rt->dev == from->dev) { 36 goto out_put_route;
42 goto out_put_nb; 37 }
43 }
44 38
45 /* Remote end sending a call request on an already 39 /* Avoid a loop. This is the normal exit path for a
46 * established LCI? It shouldnt happen, just in case.. 40 * system with only one x.25 iface and default route
47 */ 41 */
48 read_lock_bh(&x25_forward_list_lock); 42 if (rt->dev == from->dev) {
49 list_for_each(entry, &x25_forward_list) { 43 goto out_put_nb;
50 x25_frwd = list_entry(entry, struct x25_forward, node); 44 }
51 if (x25_frwd->lci == lci) { 45
52 printk(KERN_WARNING "X.25: call request for lci which is already registered!, transmitting but not registering new pair\n"); 46 /* Remote end sending a call request on an already
53 same_lci = 1; 47 * established LCI? It shouldnt happen, just in case..
54 } 48 */
55 } 49 read_lock_bh(&x25_forward_list_lock);
56 read_unlock_bh(&x25_forward_list_lock); 50 list_for_each(entry, &x25_forward_list) {
57 51 x25_frwd = list_entry(entry, struct x25_forward, node);
58 /* Save the forwarding details for future traffic */ 52 if (x25_frwd->lci == lci) {
59 if (!same_lci){ 53 printk(KERN_WARNING "X.25: call request for lci which is already registered!, transmitting but not registering new pair\n");
60 if ((new_frwd = kmalloc(sizeof(struct x25_forward), 54 same_lci = 1;
61 GFP_ATOMIC)) == NULL){
62 rc = -ENOMEM;
63 goto out_put_nb;
64 }
65 new_frwd->lci = lci;
66 new_frwd->dev1 = rt->dev;
67 new_frwd->dev2 = from->dev;
68 write_lock_bh(&x25_forward_list_lock);
69 list_add(&new_frwd->node, &x25_forward_list);
70 write_unlock_bh(&x25_forward_list_lock);
71 } 55 }
56 }
57 read_unlock_bh(&x25_forward_list_lock);
72 58
73 /* Forward the call request */ 59 /* Save the forwarding details for future traffic */
74 if ( (skbn = skb_clone(skb, GFP_ATOMIC)) == NULL){ 60 if (!same_lci){
61 if ((new_frwd = kmalloc(sizeof(struct x25_forward),
62 GFP_ATOMIC)) == NULL){
63 rc = -ENOMEM;
75 goto out_put_nb; 64 goto out_put_nb;
76 } 65 }
77 x25_transmit_link(skbn, neigh_new); 66 new_frwd->lci = lci;
78 rc = 1; 67 new_frwd->dev1 = rt->dev;
68 new_frwd->dev2 = from->dev;
69 write_lock_bh(&x25_forward_list_lock);
70 list_add(&new_frwd->node, &x25_forward_list);
71 write_unlock_bh(&x25_forward_list_lock);
79 } 72 }
80 73
74 /* Forward the call request */
75 if ( (skbn = skb_clone(skb, GFP_ATOMIC)) == NULL){
76 goto out_put_nb;
77 }
78 x25_transmit_link(skbn, neigh_new);
79 rc = 1;
80
81 81
82out_put_nb: 82out_put_nb:
83 x25_neigh_put(neigh_new); 83 x25_neigh_put(neigh_new);
84 84
85out_put_route: 85out_put_route:
86 x25_route_put(rt); 86 x25_route_put(rt);
87
88out_no_route:
87 return rc; 89 return rc;
88} 90}
89 91