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Fix unable to send big UDP packets when SNAT rules are configured for nat46 #39

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Fix unable to send big UDP packets when SNAT rules are configured for nat46 #39

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11 changes: 11 additions & 0 deletions nat46/modules/nat46-core.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1979,6 +1979,17 @@ int nat46_ipv4_input(struct sk_buff *old_skb) {

nat46debug(5, "about to send v6 packet, flags: %02x", IP6CB(new_skb)->flags);
nat46_netdev_count_xmit(new_skb, old_skb->dev);

/*
* Although the protocol stipulates that the intermediate routers prohibit
* fragmentation of IPv6 packets, we have done the translation from IPv4
* to IPv6 here. The IPv6 packets are created by nat46, so the nat46 can be
* regarded as the sender. If fragmentation is needed, let the network
* protocol stack does it.
*/
if(0 == (ntohs(hdr4->frag_off) & 0x4000)) {
new_skb->local_df = 1;
}
netif_rx(new_skb);

done:
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