Commit 89a23c8b authored Apr 26, 2017 by Craig Gallek Committed by David S. Miller May 01, 2017

ip6_tunnel: Fix missing tunnel encapsulation limit option



The IPv6 tunneling code tries to insert IPV6_TLV_TNL_ENCAP_LIMIT and
IPV6_TLV_PADN options when an encapsulation limit is defined (the
default is a limit of 4).  An MTU adjustment is done to account for
these options as well.  However, the options are never present in the
generated packets.

The issue appears to be a subtlety between IPV6_DSTOPTS and
IPV6_RTHDRDSTOPTS defined in RFC 3542.  When the IPIP tunnel driver was
written, the encap limit options were included as IPV6_RTHDRDSTOPTS in
dst0opt of struct ipv6_txoptions.  Later, ipv6_push_nfrags_opts was
(correctly) updated to require IPV6_RTHDR options when IPV6_RTHDRDSTOPTS
are to be used.  This caused the options to no longer be included in v6
encapsulated packets.

The fix is to use IPV6_DSTOPTS (in dst1opt of struct ipv6_txoptions)
instead.  IPV6_DSTOPTS do not have the additional IPV6_RTHDR requirement.

Fixes: 1df64a8569c7: ("[IPV6]: Add ip6ip6 tunnel driver.")
Fixes: 333fad53: ("[IPV6]: Support several new sockopt / ancillary data in Advanced API (RFC3542)")
Signed-off-by: Craig Gallek <kraig@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent f9ed236c

net/ipv6/ip6_tunnel.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -954,7 +954,7 @@ static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
		opt->dst_opt[5] = IPV6_TLV_PADN;
		opt->dst_opt[6] = 1;

		opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
		opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
		opt->ops.opt_nflen = 8;
		}

		@@ -1178,7 +1178,7 @@ route_lookup:

		if (encap_limit >= 0) {
		init_tel_txopt(&opt, encap_limit);
		ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL, NULL);
		ipv6_push_frag_opts(skb, &opt.ops, &proto);
		}

		/* Calculate max headroom for all the headers and adjust

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