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net: fix ipv6 routing

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ipv6 routing in grub2 is broken, we cannot talk to anything outside our local
network or anything that doesn't route in our global namespace.  This patch
fixes this by doing a couple of things

1) Read the router information off of the router advertisement.  If we have a
router lifetime we need to take the source address and create a route from it.

2) Changes the routing stuff slightly to allow you to specify a gateway _and_ an
interface.  Since the router advertisements come in on the link local address we
need to associate it with the global address on the card.  So when we are
processing the router advertisement, either use the SLAAC interface we create
and add the route to that interface, or loop through the global addresses we
currently have on our interface and associate it with one of those addresses.
We need to have a special case here for the default route so that it gets used,
we do this by setting the masksize to 0 to mean it encompasses all networks.
The routing code will automatically select the best route so if there is a
closer match we will use that.

With this patch I can now talk to ipv6 addresses outside of my local network.
Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
This commit is contained in:
Josef Bacik 2016-02-10 13:21:00 -08:00 • committed by Andrei Borzenkov
parent 94c56a4c65
commit eb9f401fc1
5 changed files with 103 additions and 31 deletions
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40
grub-core/net/net.c
View file

@ -37,21 +37,6 @@ GRUB_MOD_LICENSE ("GPLv3+");
char *grub_net_default_server;
struct grub_net_route
{
struct grub_net_route *next;
struct grub_net_route **prev;
grub_net_network_level_netaddress_t target;
char *name;
struct grub_net_network_level_protocol *prot;
int is_gateway;
union
{
struct grub_net_network_level_interface *interface;
grub_net_network_level_address_t gw;
};
};
struct grub_net_route *grub_net_routes = NULL;
struct grub_net_network_level_interface *grub_net_network_level_interfaces = NULL;
struct grub_net_card *grub_net_cards = NULL;
@ -410,14 +395,6 @@ grub_cmd_ipv6_autoconf (struct grub_command *cmd __attribute__ ((unused)),
return err;
}
static inline void
grub_net_route_register (struct grub_net_route *route)
{
grub_list_push (GRUB_AS_LIST_P (&grub_net_routes),
GRUB_AS_LIST (route));
}
#define FOR_NET_ROUTES(var) for (var = grub_net_routes; var; var = var->next)
static int
parse_ip (const char *val, grub_uint32_t *ip, const char **rest)
@ -524,6 +501,8 @@ match_net (const grub_net_network_level_netaddress_t *net,
case GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6:
{
grub_uint64_t mask[2];
if (net->ipv6.masksize == 0)
return 1;
if (net->ipv6.masksize <= 64)
{
mask[0] = 0xffffffffffffffffULL << (64 - net->ipv6.masksize);
@ -687,7 +666,14 @@ grub_net_route_address (grub_net_network_level_address_t addr,
return GRUB_ERR_NONE;
}
if (depth == 0)
*gateway = bestroute->gw;
{
*gateway = bestroute->gw;
if (bestroute->interface != NULL)
{
*interf = bestroute->interface;
return GRUB_ERR_NONE;
}
}
curtarget = bestroute->gw;
}
@ -1109,7 +1095,8 @@ grub_net_add_route (const char *name,
grub_err_t
grub_net_add_route_gw (const char *name,
grub_net_network_level_netaddress_t target,
grub_net_network_level_address_t gw)
grub_net_network_level_address_t gw,
struct grub_net_network_level_interface *inter)
{
struct grub_net_route *route;
@ -1127,6 +1114,7 @@ grub_net_add_route_gw (const char *name,
route->target = target;
route->is_gateway = 1;
route->gw = gw;
route->interface = inter;
grub_net_route_register (route);
@ -1152,7 +1140,7 @@ grub_cmd_addroute (struct grub_command *cmd __attribute__ ((unused)),
err = grub_net_resolve_address (args[3], &gw);
if (err)
return err;
return grub_net_add_route_gw (args[0], target, gw);
return grub_net_add_route_gw (args[0], target, gw, NULL);
}
else
{