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51 lines
2.0 KiB
Diff
51 lines
2.0 KiB
Diff
From 89a23c8b528bd2c89f3981573d6cd7d23840c8a6 Mon Sep 17 00:00:00 2001
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From: Craig Gallek <cgallek@google.com>
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Date: Wed, 26 Apr 2017 14:37:45 -0400
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Subject: [PATCH] ip6_tunnel: Fix missing tunnel encapsulation limit option
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The IPv6 tunneling code tries to insert IPV6_TLV_TNL_ENCAP_LIMIT and
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IPV6_TLV_PADN options when an encapsulation limit is defined (the
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default is a limit of 4). An MTU adjustment is done to account for
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these options as well. However, the options are never present in the
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generated packets.
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The issue appears to be a subtlety between IPV6_DSTOPTS and
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IPV6_RTHDRDSTOPTS defined in RFC 3542. When the IPIP tunnel driver was
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written, the encap limit options were included as IPV6_RTHDRDSTOPTS in
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dst0opt of struct ipv6_txoptions. Later, ipv6_push_nfrags_opts was
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(correctly) updated to require IPV6_RTHDR options when IPV6_RTHDRDSTOPTS
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are to be used. This caused the options to no longer be included in v6
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encapsulated packets.
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The fix is to use IPV6_DSTOPTS (in dst1opt of struct ipv6_txoptions)
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instead. IPV6_DSTOPTS do not have the additional IPV6_RTHDR requirement.
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Fixes: 1df64a8569c7: ("[IPV6]: Add ip6ip6 tunnel driver.")
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Fixes: 333fad5364d6: ("[IPV6]: Support several new sockopt / ancillary data in Advanced API (RFC3542)")
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Signed-off-by: Craig Gallek <kraig@google.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/ipv6/ip6_tunnel.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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--- a/net/ipv6/ip6_tunnel.c
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+++ b/net/ipv6/ip6_tunnel.c
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@@ -958,7 +958,7 @@ static void init_tel_txopt(struct ipv6_t
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opt->dst_opt[5] = IPV6_TLV_PADN;
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opt->dst_opt[6] = 1;
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- opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
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+ opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
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opt->ops.opt_nflen = 8;
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}
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@@ -1200,7 +1200,7 @@ route_lookup:
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if (encap_limit >= 0) {
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init_tel_txopt(&opt, encap_limit);
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- ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
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+ ipv6_push_frag_opts(skb, &opt.ops, &proto);
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}
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skb_push(skb, sizeof(struct ipv6hdr));
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