netdev - [PATCH net] ipv6: take care of disable

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Message-Id: <20220623120015.32640-1-nicolas.dichtel@6wind.com>
Date:   Thu, 23 Jun 2022 14:00:15 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Steffen Klassert <klassert@...nel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>
Cc:     David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>, stable@...nel.org,
        David Forster <dforster@...cade.com>,
        Siwar Zitouni <siwar.zitouni@...nd.com>
Subject: [PATCH net] ipv6: take care of disable_policy when restoring routes

When routes corresponding to addresses are restored by
fixup_permanent_addr(), the dst_nopolicy parameter was not set.
The typical use case is a user that configures an address on a down
interface and then put this interface up.

Let's take care of this flag in addrconf_f6i_alloc(), so that every callers
benefit ont it.

CC: stable@...nel.org
CC: David Forster <dforster@...cade.com>
Fixes: df789fe75206 ("ipv6: Provide ipv6 version of "disable_policy" sysctl")
Reported-by: Siwar Zitouni <siwar.zitouni@...nd.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
---

I choose to be conservative in my patch, thus I filter anycast addresses. But
I don't see why this flag is not set on anycast routes. Any thoughts
about this?

 net/ipv6/addrconf.c | 4 ----
 net/ipv6/route.c    | 9 ++++++++-
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 1b1932502e9e..5864cbc30db6 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1109,10 +1109,6 @@ ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
 		goto out;
 	}
 
-	if (net->ipv6.devconf_all->disable_policy ||
-	    idev->cnf.disable_policy)
-		f6i->dst_nopolicy = true;
-
 	neigh_parms_data_state_setall(idev->nd_parms);
 
 	ifa->addr = *cfg->pfx;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index d25dc83bac62..828355710c57 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -4569,8 +4569,15 @@ struct fib6_info *addrconf_f6i_alloc(struct net *net,
 	}
 
 	f6i = ip6_route_info_create(&cfg, gfp_flags, NULL);
-	if (!IS_ERR(f6i))
+	if (!IS_ERR(f6i)) {
 		f6i->dst_nocount = true;
+
+		if (!anycast &&
+		    (net->ipv6.devconf_all->disable_policy ||
+		     idev->cnf.disable_policy))
+			f6i->dst_nopolicy = true;
+	}
+
 	return f6i;
 }
 
-- 
2.33.0