ip_gre: fix msg_name parsing for recvfrom/recvmsg
ipgre_header_parse() needs to parse the tunnel's ip header and it
uses mac_header to locate the iphdr. This got broken when gre tunneling
was refactored as mac_header is no longer updated to point to iphdr.
Introduce skb_pop_mac_header() helper to do the mac_header assignment
and use it in ipgre_rcv() to fix msg_name parsing.
Bug introduced in commit c544193214
(GRE: Refactor GRE tunneling code.)
Cc: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1638,6 +1638,11 @@ static inline void skb_set_mac_header(struct sk_buff *skb, const int offset)
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skb->mac_header += offset;
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}
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static inline void skb_pop_mac_header(struct sk_buff *skb)
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{
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skb->mac_header = skb->network_header;
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}
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static inline void skb_probe_transport_header(struct sk_buff *skb,
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const int offset_hint)
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{
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@ -217,6 +217,7 @@ static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
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iph->saddr, iph->daddr, tpi->key);
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if (tunnel) {
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skb_pop_mac_header(skb);
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ip_tunnel_rcv(tunnel, skb, tpi, log_ecn_error);
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return PACKET_RCVD;
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}
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