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Date: Wed, 12 Sep 2012 14:01:47 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: David Miller <davem@...emloft.net> Cc: netdev <netdev@...r.kernel.org>, Lorenzo Colitti <lorenzo@...gle.com>, Maciej Żenczykowski <maze@...gle.com>, Tom Herbert <therbert@...gle.com> Subject: [PATCH net-next 2/2] ipv6: dont cache cloned routes From: Eric Dumazet <edumazet@...gle.com> We can now destroy cloned routes immediately from dst_release() instead of depending on garbage collection. Set DST_NOCACHE in rt6_alloc_clone() so that : 1) we avoid calling ip6_ins_rt() on such routes 2) dst_release() can call destroy when refcount becomes 0 This allows machines to resist to DDOS. Reported-by: Lorenzo Colitti <lorenzo@...gle.com> Signed-off-by: Eric Dumazet <edumazet@...gle.com> Cc: Maciej Żenczykowski <maze@...gle.com> Cc: Tom Herbert <therbert@...gle.com> --- net/ipv6/route.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/ipv6/route.c b/net/ipv6/route.c index d4ba3fc..fedbb41 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -840,6 +840,7 @@ static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct rt6_info *rt = ip6_rt_copy(ort, daddr); if (rt) { + rt->dst.flags |= DST_NOCACHE; rt->rt6i_flags |= RTF_CACHE; rt->n = neigh_clone(ort->n); } @@ -887,7 +888,7 @@ restart: dst_hold(&rt->dst); if (nrt) { - err = ip6_ins_rt(nrt); + err = (nrt->dst.flags & DST_NOCACHE) ? 0 : ip6_ins_rt(nrt); if (!err) goto out2; } -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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