Ticket #626: patch-multi_process_incoming_tun.patch

File patch-multi_process_incoming_tun.patch, 1.6 KB (added by zewaren, 8 years ago)

  • src/openvpn/multi.c 

    From 345108234ee2d6d947417bc242354dd68c70fa72 Mon Sep 17 00:00:00 2001
From: Erwan Martin <public@fzwte.net>
Date: Tue, 10 Nov 2015 11:50:24 +0100
Subject: [PATCH] Delete routes to addresses that come from the local
 interface.

When receiving a packet on the TUN/TAP interface, check that the source address is not in the routing table. If it is, that means that the address moved from the network of a client to the network of the server, and thus its route should be deleted.

Signed-off-by: Erwan Martin <public@fzwte.net>
---
 src/openvpn/multi.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/openvpn/multi.c b/src/openvpn/multi.c
index 7c3aaac..765ff00 100644
    a b multi_process_incoming_tun (struct multi_context *m, const unsigned int mpp_flag 
    26262626            }
    26272627          else
    26282628            {
     2629              struct hash_element *he;
     2630              const uint32_t hv = hash_value (m->vhash, &src);
     2631              struct hash_bucket *bucket = hash_bucket (m->vhash, hv);
     2632              he = hash_lookup_fast (m->vhash, bucket, &src, hv);
     2633              if (he) {
     2634                /* the packet comes from the local interface, but a route exists for its source address -> delete it */
     2635                struct multi_route *bad_route = (struct multi_route *) he->value;
     2636                hash_remove_fast (m->vhash, bucket, &src, hv);
     2637                multi_route_del (bad_route);
     2638
     2639                msg (D_MULTI_LOW, "MULTI: Learn: %s -> local interface",
     2640                 mroute_addr_print (&src, &gc));
     2641              }
     2642
    26292643              multi_set_pending (m, multi_get_instance_by_virtual_addr (m, &dest, dev_type == DEV_TYPE_TUN));
    26302644
    26312645              if (m->pending)