0df337fbe4
Recent changes in the routing configuration of OpenWrt broke source address selection, sometimes leading to the node trying to contact other addresses in the mesh network from the next-node address. Revert the problematic commits until this has been solved upstream.
109 lines
3.8 KiB
Diff
109 lines
3.8 KiB
Diff
From: Matthias Schiffer <mschiffer@universe-factory.net>
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Date: Sun, 21 Jun 2015 05:49:05 +0200
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Subject: Revert "linux: backport IPv6 SAS fixes for source-specific routes"
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This reverts commit 5168c9a5702648eb690d32ec821647aca80aeba9.
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diff --git a/target/linux/generic/patches-3.18/667-ipv6-Fixed-source-specific-default-route-handling.patch b/target/linux/generic/patches-3.18/667-ipv6-Fixed-source-specific-default-route-handling.patch
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deleted file mode 100644
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index f67ef47..0000000
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--- a/target/linux/generic/patches-3.18/667-ipv6-Fixed-source-specific-default-route-handling.patch
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+++ /dev/null
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@@ -1,96 +0,0 @@
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-From e16e888b525503be05b3aea64190e8b3bdef44d0 Mon Sep 17 00:00:00 2001
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-From: Markus Stenberg <markus.stenberg@iki.fi>
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-Date: Tue, 5 May 2015 13:36:59 +0300
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-Subject: [PATCH] ipv6: Fixed source specific default route handling.
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-
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-If there are only IPv6 source specific default routes present, the
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-host gets -ENETUNREACH on e.g. connect() because ip6_dst_lookup_tail
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-calls ip6_route_output first, and given source address any, it fails,
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-and ip6_route_get_saddr is never called.
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-
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-The change is to use the ip6_route_get_saddr, even if the initial
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-ip6_route_output fails, and then doing ip6_route_output _again_ after
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-we have appropriate source address available.
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-
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-Note that this is '99% fix' to the problem; a correct fix would be to
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-do route lookups only within addrconf.c when picking a source address,
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-and never call ip6_route_output before source address has been
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-populated.
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-
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-Signed-off-by: Markus Stenberg <markus.stenberg@iki.fi>
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-Signed-off-by: David S. Miller <davem@davemloft.net>
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----
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- net/ipv6/ip6_output.c | 39 +++++++++++++++++++++++++++++++--------
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- net/ipv6/route.c | 5 +++--
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- 2 files changed, 34 insertions(+), 10 deletions(-)
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-
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---- a/net/ipv6/ip6_output.c
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-+++ b/net/ipv6/ip6_output.c
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-@@ -898,21 +898,45 @@ static int ip6_dst_lookup_tail(struct so
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- #endif
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- int err;
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-
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-- if (*dst == NULL)
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-- *dst = ip6_route_output(net, sk, fl6);
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--
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-- if ((err = (*dst)->error))
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-- goto out_err_release;
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-+ /* The correct way to handle this would be to do
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-+ * ip6_route_get_saddr, and then ip6_route_output; however,
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-+ * the route-specific preferred source forces the
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-+ * ip6_route_output call _before_ ip6_route_get_saddr.
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-+ *
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-+ * In source specific routing (no src=any default route),
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-+ * ip6_route_output will fail given src=any saddr, though, so
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-+ * that's why we try it again later.
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-+ */
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-+ if (ipv6_addr_any(&fl6->saddr) && (!*dst || !(*dst)->error)) {
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-+ struct rt6_info *rt;
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-+ bool had_dst = *dst != NULL;
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-
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-- if (ipv6_addr_any(&fl6->saddr)) {
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-- struct rt6_info *rt = (struct rt6_info *) *dst;
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-+ if (!had_dst)
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-+ *dst = ip6_route_output(net, sk, fl6);
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-+ rt = (*dst)->error ? NULL : (struct rt6_info *)*dst;
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- err = ip6_route_get_saddr(net, rt, &fl6->daddr,
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- sk ? inet6_sk(sk)->srcprefs : 0,
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- &fl6->saddr);
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- if (err)
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- goto out_err_release;
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-+
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-+ /* If we had an erroneous initial result, pretend it
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-+ * never existed and let the SA-enabled version take
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-+ * over.
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-+ */
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-+ if (!had_dst && (*dst)->error) {
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-+ dst_release(*dst);
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-+ *dst = NULL;
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-+ }
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- }
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-
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-+ if (!*dst)
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-+ *dst = ip6_route_output(net, sk, fl6);
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-+
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-+ err = (*dst)->error;
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-+ if (err)
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-+ goto out_err_release;
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-+
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- #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
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- /*
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- * Here if the dst entry we've looked up
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---- a/net/ipv6/route.c
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-+++ b/net/ipv6/route.c
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-@@ -2182,9 +2182,10 @@ int ip6_route_get_saddr(struct net *net,
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- unsigned int prefs,
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- struct in6_addr *saddr)
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- {
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-- struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
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-+ struct inet6_dev *idev =
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-+ rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
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- int err = 0;
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-- if (rt->rt6i_prefsrc.plen)
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-+ if (rt && rt->rt6i_prefsrc.plen)
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- *saddr = rt->rt6i_prefsrc.addr;
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- else
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- err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
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