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[PATCH 3/3] net: fix ipv6 routing
|
From: |
Josef Bacik |
|
Subject: |
[PATCH 3/3] net: fix ipv6 routing |
|
Date: |
Wed, 5 Aug 2015 10:50:40 -0700 |
Currently we cannot talk to ipv6 addresses outside of our local link area
because we don't setup our routes properly nor do we talk to the router
properly. Currently net_ipv6_autoconf adds routes for the local link prefix and
ties it to the global link device. This isn't helpful at all, we completely
drop the router part of the router advertisement. So instead create a "default
route" flag in routes and create a new route with the local link prefix and the
router source address.
The second part of this problem is that the routing code thinks in ipv4 terms,
so it expects to find a route to the address we're looking for in our routing
table. If we find a gateway then we just look for which interface matches the
network for the gateway. This doesn't work for ipv6 since the router gives us
its local link address, so the gateway will find the local link interface,
instead of the global interface. So to deal with this do a few things
1) Create a new "default route" flag for any router advertisements we get when
doing the ipv6 autoconf stuff. Then we create a normal gateway route with the
default route flag set.
2) When looking for routes keep track of any default routes we find, and if we
don't find an exact route that matches we use the default route, which will set
the gateway to the router, and then we will find the local link interface that
matches this router.
3) Translate the local link interface to the global link interface. We build
the ip packets based on the address on the interface, and this needs to have the
global address, not the local one. So loop through our interfaces until we find
a global address with the same hwaddress as the local link interface and use
that instead. This way we get the right addresses on our IP packets.
With this patch I can now do net_ipv6_autoconf and immediately talk to ipv6
addresses outside of my local network. Thanks,
Signed-off-by: Josef Bacik <address@hidden>
---
grub-core/net/bootp.c | 2 +-
grub-core/net/drivers/ieee1275/ofnet.c | 2 +-
grub-core/net/icmp6.c | 50 ++++++++++------------
grub-core/net/net.c | 76 +++++++++++++++++++++-------------
include/grub/net.h | 28 ++++++++++++-
5 files changed, 99 insertions(+), 59 deletions(-)
diff --git a/grub-core/net/bootp.c b/grub-core/net/bootp.c
index 37d1cfa..ed6cf44 100644
--- a/grub-core/net/bootp.c
+++ b/grub-core/net/bootp.c
@@ -83,7 +83,7 @@ parse_dhcp_vendor (const char *name, const void *vend, int
limit, int *mask)
grub_memcpy (&gw.ipv4, ptr, sizeof (gw.ipv4));
rname = grub_xasprintf ("%s:default", name);
if (rname)
- grub_net_add_route_gw (rname, target, gw);
+ grub_net_add_route_gw (rname, target, gw, 0);
grub_free (rname);
}
break;
diff --git a/grub-core/net/drivers/ieee1275/ofnet.c
b/grub-core/net/drivers/ieee1275/ofnet.c
index eea8e71..801ab1c 100644
--- a/grub-core/net/drivers/ieee1275/ofnet.c
+++ b/grub-core/net/drivers/ieee1275/ofnet.c
@@ -221,7 +221,7 @@ grub_ieee1275_parse_bootpath (const char *devpath, char
*bootpath,
target.ipv4.masksize = 0;
rname = grub_xasprintf ("%s:default", ((*card)->name));
if (rname)
- grub_net_add_route_gw (rname, target, gateway_addr);
+ grub_net_add_route_gw (rname, target, gateway_addr, 0);
else
return grub_errno;
}
diff --git a/grub-core/net/icmp6.c b/grub-core/net/icmp6.c
index 7953e68..fad04a9 100644
--- a/grub-core/net/icmp6.c
+++ b/grub-core/net/icmp6.c
@@ -373,7 +373,10 @@ grub_net_recv_icmp6_packet (struct grub_net_buff *nb,
if (ohdr->type == OPTION_PREFIX && ohdr->len == 4)
{
struct prefix_option *opt = (struct prefix_option *) ptr;
+ struct grub_net_route *route;
struct grub_net_slaac_mac_list *slaac;
+
+ grub_net_network_level_netaddress_t netaddr;
if (!(opt->flags & FLAG_SLAAC)
|| (grub_be_to_cpu64 (opt->prefix[0]) >> 48) == 0xfe80
|| (grub_be_to_cpu32 (opt->preferred_lifetime)
@@ -391,18 +394,12 @@ grub_net_recv_icmp6_packet (struct grub_net_buff *nb,
for (slaac = card->slaac_list; slaac; slaac = slaac->next)
{
grub_net_network_level_address_t addr;
- grub_net_network_level_netaddress_t netaddr;
-
if (slaac->address.type
!= GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET)
continue;
addr.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6;
addr.ipv6[0] = opt->prefix[0];
addr.ipv6[1] = grub_net_ipv6_get_id (&slaac->address);
- netaddr.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6;
- netaddr.ipv6.base[0] = opt->prefix[0];
- netaddr.ipv6.base[1] = 0;
- netaddr.ipv6.masksize = 64;
FOR_NET_NETWORK_LEVEL_INTERFACES (inf)
{
@@ -410,29 +407,28 @@ grub_net_recv_icmp6_packet (struct grub_net_buff *nb,
&& grub_net_addr_cmp (&inf->address, &addr) == 0)
break;
}
- /* Update lease time if needed here once we have
- lease times. */
- if (inf)
- continue;
+ if (!inf)
+ slaac->slaac_counter++;
+ }
- grub_dprintf ("net", "creating slaac\n");
+ netaddr.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6;
+ netaddr.ipv6.base[0] = opt->prefix[0];
+ netaddr.ipv6.base[1] = 0;
+ netaddr.ipv6.masksize = 64;
- {
- char *name;
- name = grub_xasprintf ("%s:%d",
- slaac->name,
slaac->slaac_counter++);
- if (!name)
- {
- grub_errno = GRUB_ERR_NONE;
- continue;
- }
- inf = grub_net_add_addr (name,
- card, &addr,
- &slaac->address, 0);
- grub_net_add_route (name, netaddr, inf);
- grub_free (name);
- }
- }
+ FOR_NET_ROUTES(route)
+ {
+ if (!grub_memcmp(&route->gw, source, sizeof (route->gw)))
+ break;
+ }
+ /* Update lease time if needed here once we have
+ lease times. */
+ if (route)
+ continue;
+
+ grub_dprintf ("net", "creating default route\n");
+
+ grub_net_add_route_gw ("default6", netaddr, *source, 1);
}
}
if (ptr != nb->tail)
diff --git a/grub-core/net/net.c b/grub-core/net/net.c
index f96297a..185b635 100644
--- a/grub-core/net/net.c
+++ b/grub-core/net/net.c
@@ -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;
@@ -422,14 +407,6 @@ 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)
@@ -650,6 +627,11 @@ route_cmp (const struct grub_net_route *a, const struct
grub_net_route *b)
return +1;
if (a->target.ipv6.masksize < b->target.ipv6.masksize)
return -1;
+ /* We want to prefer non-default routes over default routes */
+ if (a->default_route > b->default_route)
+ return -1;
+ if (a->default_route < b->default_route)
+ return +1;
break;
case GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4:
if (a->target.ipv4.masksize > b->target.ipv4.masksize)
@@ -661,6 +643,32 @@ route_cmp (const struct grub_net_route *a, const struct
grub_net_route *b)
return 0;
}
+static struct grub_net_network_level_interface *
+grub_ipv6_global_interface (struct grub_net_network_level_interface *inf)
+{
+ grub_net_link_level_address_t hwaddr;
+ struct grub_net_network_level_interface *tmp;
+
+ /* We don't care about non ipv6 interfaces */
+ if (inf->address.type != GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6)
+ return inf;
+
+ /* If this isn't a link local interface then we're good to go */
+ if (inf->address.ipv6[0] != grub_cpu_to_be64_compile_time (0xfe80ULL << 48))
+ return inf;
+
+ grub_memcpy(&hwaddr, &inf->hwaddress, sizeof (inf->hwaddress));
+
+ FOR_NET_NETWORK_LEVEL_INTERFACES (tmp)
+ {
+ if (tmp->address.ipv6[0] == grub_cpu_to_be64_compile_time (0xfe80ULL <<
48))
+ continue;
+ if (grub_net_hwaddr_cmp(&tmp->hwaddress, &hwaddr) == 0)
+ return tmp;
+ }
+ return inf;
+}
+
grub_err_t
grub_net_route_address (grub_net_network_level_address_t addr,
grub_net_network_level_address_t *gateway,
@@ -680,22 +688,29 @@ grub_net_route_address (grub_net_network_level_address_t
addr,
for (depth = 0; depth < routecnt + 2 && depth < GRUB_UINT_MAX; depth++)
{
struct grub_net_route *bestroute = NULL;
+ struct grub_net_route *defaultroute = NULL;
+
FOR_NET_ROUTES(route)
{
if (depth && prot != route->prot)
continue;
+ if (!defaultroute && route->default_route)
+ defaultroute = route;
if (!match_net (&route->target, &curtarget))
continue;
if (route_cmp (route, bestroute) > 0)
bestroute = route;
}
- if (bestroute == NULL)
- return grub_error (GRUB_ERR_NET_NO_ROUTE,
- N_("destination unreachable"));
+ if (bestroute == NULL) {
+ if (defaultroute == NULL)
+ return grub_error (GRUB_ERR_NET_NO_ROUTE,
+ N_("destination unreachable"));
+ bestroute = defaultroute;
+ }
if (!bestroute->is_gateway)
{
- *interf = bestroute->interface;
+ *interf = grub_ipv6_global_interface(bestroute->interface);
return GRUB_ERR_NONE;
}
if (depth == 0)
@@ -1121,7 +1136,7 @@ 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, int default_route)
{
struct grub_net_route *route;
@@ -1139,6 +1154,7 @@ grub_net_add_route_gw (const char *name,
route->target = target;
route->is_gateway = 1;
route->gw = gw;
+ route->default_route = default_route;
grub_net_route_register (route);
@@ -1164,7 +1180,7 @@ 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, 0);
}
else
{
@@ -1239,6 +1255,8 @@ grub_cmd_listroutes (struct grub_command *cmd
__attribute__ ((unused)),
}
else
grub_printf ("%s", route->interface->name);
+ if (route->default_route)
+ grub_printf (" default route");
grub_printf ("\n");
}
return GRUB_ERR_NONE;
diff --git a/include/grub/net.h b/include/grub/net.h
index 4571b72..4e98ddd 100644
--- a/include/grub/net.h
+++ b/include/grub/net.h
@@ -192,6 +192,22 @@ typedef struct grub_net_network_level_netaddress
};
} grub_net_network_level_netaddress_t;
+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;
+ int default_route;
+ union
+ {
+ struct grub_net_network_level_interface *interface;
+ grub_net_network_level_address_t gw;
+ };
+};
+
#define FOR_PACKETS(cont,var) for (var = (cont).first; var; var = var->next)
static inline grub_err_t
@@ -368,6 +384,16 @@ grub_net_card_unregister (struct grub_net_card *card);
#define FOR_NET_CARDS_SAFE(var, next) for (var = grub_net_cards, next = (var ?
var->next : 0); var; var = next, next = (var ? var->next : 0))
+extern struct grub_net_route *grub_net_routes;
+
+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)
struct grub_net_session *
grub_net_open_tcp (char *address, grub_uint16_t port);
@@ -393,7 +419,7 @@ 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, int default_route);
#define GRUB_NET_BOOTP_MAC_ADDR_LEN 16
--
1.8.5.6