Commit 6dfac5c3 authored Mar 30, 2014 by Hannes Frederic Sowa Committed by David S. Miller Mar 31, 2014

ipv6: strengthen fallback fragmentation id generation

First off, we don't need to check for non-NULL rt any more, as we are
guaranteed to always get a valid rt6_info. Drop the check.

In case we couldn't allocate an inet_peer for fragmentation information
we currently generate strictly incrementing fragmentation ids for all
destination. This is done to maximize the cycle and avoid collisions.

Those fragmentation ids are very predictable. At least we should try to
mix in the destination address.

While it should make no difference to simply use a PRNG at this point,
secure_ipv6_id ensures that we don't leak information from prandom,
so its internal state could be recoverable.

This fallback function should normally not get used thus this should
not affect performance at all. It is just meant as a safety net.

Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent a50e233c

net/ipv6/output_core.c

+15 −12

Original line number	Diff line number	Diff line
		@@ -6,14 +6,15 @@
		#include <net/ipv6.h>
		#include <net/ip6_fib.h>
		#include <net/addrconf.h>
		#include <net/secure_seq.h>

		void ipv6_select_ident(struct frag_hdr fhdr, struct rt6_info rt)
		{
		static atomic_t ipv6_fragmentation_id;
		struct in6_addr addr;
		int old, new;

		#if IS_ENABLED(CONFIG_IPV6)
		if (rt) {
		struct inet_peer *peer;
		struct net *net;

		@@ -24,7 +25,6 @@ void ipv6_select_ident(struct frag_hdr fhdr, struct rt6_info rt)
		inet_putpeer(peer);
		return;
		}
		}
		#endif
		do {
		old = atomic_read(&ipv6_fragmentation_id);
		@@ -32,7 +32,10 @@ void ipv6_select_ident(struct frag_hdr fhdr, struct rt6_info rt)
		if (!new)
		new = 1;
		} while (atomic_cmpxchg(&ipv6_fragmentation_id, old, new) != old);
		fhdr->identification = htonl(new);

		addr = rt->rt6i_dst.addr;
		addr.s6_addr32[0] ^= (__force __be32)new;
		fhdr->identification = htonl(secure_ipv6_id(addr.s6_addr32));
		}
		EXPORT_SYMBOL(ipv6_select_ident);

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