On Mon, Aug 8, 2011 at 3:39 PM, Kieran Mansley <kie...@recoil.org> wrote:
> On Mon, 2011-08-08 at 15:28 +0530, Rahul Gundecha wrote: > > Running tcpdump shows that tap0 sends Router Solicitation and Router > > Advertisements. But no other packet hits tap0 interface. > > In that case I would start looking at why the lwIP end of the tap link > doesn't think it has received a router advertisement as from your > previous description that seems to be the problem. > Yes, Router Advertisements were not reaching to lwip due to filtering in tapif_input based on ethertype. I added a check for IPv6 ethertype and now I can see IPv6 packets reaching lwip. Second problem was that there was no output_ip6 function assigned for the netif interface. After assigning ethip6_output as output_ip6 function I can see lwip sends the packets which are seen on other end of tap interface. However now the problem is that the link-local IP address is not correctly assigned to the interface. The packets are sent with source address as IP6_ADDR_ANY. Debugging this issue further. Below is the patch fixing the first two issues, can someone point me the procedure to submit the patch to lwip-contrib. Is there any different mailing list for that. Thanks, Rahul diff --git a/ports/unix/netif/tapif.c b/ports/unix/netif/tapif.c index 49bca65..974c0ad 100644 --- a/ports/unix/netif/tapif.c +++ b/ports/unix/netif/tapif.c @@ -52,6 +52,7 @@ #include "lwip/sys.h" #include "netif/etharp.h" +#include "lwip/ethip6.h" #if defined(LWIP_DEBUG) && defined(LWIP_TCPDUMP) #include "netif/tcpdump.h" @@ -300,6 +301,7 @@ tapif_input(struct netif *netif) /* IP or ARP packet? */ case ETHTYPE_IP: case ETHTYPE_ARP: + case ETHTYPE_IPV6: #if PPPOE_SUPPORT /* PPPoE packet? */ case ETHTYPE_PPPOEDISC: @@ -340,6 +342,10 @@ tapif_init(struct netif *netif) netif->name[0] = IFNAME0; netif->name[1] = IFNAME1; netif->output = etharp_output; +#if LWIP_IPV6 + netif->output_ip6 = ethip6_output; +#endif /* LWIP_IPV6 */ + netif->linkoutput = low_level_output; netif->mtu = 1500; /* hardware address length */ > > Perhaps lwIP isn't automatically assigning an IPv6 address to its end of > the link (I would be surprised if it did) and so you would have to > arrange for this to happen, but I'm not sure of the exact commands to do > this as the IPv6 code is new enough that I haven't experimented with it > yet. > > Kieran > > > _______________________________________________ > lwip-users mailing list > lwip-users@nongnu.org > https://lists.nongnu.org/mailman/listinfo/lwip-users >
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