forked from luck/tmp_suning_uos_patched
gre: do not pull header in ICMP error processing
iptunnel_pull_header expects that IP header was already pulled; with this
expectation, it pulls the tunnel header. This is not true in gre_err.
Furthermore, ipv4_update_pmtu and ipv4_redirect expect that skb->data points
to the IP header.
We cannot pull the tunnel header in this path. It's just a matter of not
calling iptunnel_pull_header - we don't need any of its effects.
Fixes: bda7bb4634
("gre: Allow multiple protocol listener for gre protocol.")
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
2c94b53738
commit
b7f8fe251e
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@ -179,6 +179,7 @@ static __be16 tnl_flags_to_gre_flags(__be16 tflags)
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return flags;
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}
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/* Fills in tpi and returns header length to be pulled. */
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static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
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bool *csum_err)
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{
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@ -238,7 +239,7 @@ static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
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return -EINVAL;
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}
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}
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return iptunnel_pull_header(skb, hdr_len, tpi->proto, false);
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return hdr_len;
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}
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static void ipgre_err(struct sk_buff *skb, u32 info,
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@ -341,7 +342,7 @@ static void gre_err(struct sk_buff *skb, u32 info)
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struct tnl_ptk_info tpi;
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bool csum_err = false;
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if (parse_gre_header(skb, &tpi, &csum_err)) {
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if (parse_gre_header(skb, &tpi, &csum_err) < 0) {
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if (!csum_err) /* ignore csum errors. */
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return;
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}
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@ -419,6 +420,7 @@ static int gre_rcv(struct sk_buff *skb)
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{
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struct tnl_ptk_info tpi;
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bool csum_err = false;
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int hdr_len;
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#ifdef CONFIG_NET_IPGRE_BROADCAST
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if (ipv4_is_multicast(ip_hdr(skb)->daddr)) {
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@ -428,7 +430,10 @@ static int gre_rcv(struct sk_buff *skb)
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}
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#endif
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if (parse_gre_header(skb, &tpi, &csum_err) < 0)
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hdr_len = parse_gre_header(skb, &tpi, &csum_err);
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if (hdr_len < 0)
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goto drop;
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if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false) < 0)
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goto drop;
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if (ipgre_rcv(skb, &tpi) == PACKET_RCVD)
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