iptunnel_pmtud_check_icmpv6(9)

✨ NAME ✨

okay bestie, welcome to the <iptunnel_pmtud_check_icmpv6(9)> page in the Kernel API Manual — manual name folded in right here, as promised 🫶. This function has one job: trigger an ICMPv6 reply if that reply is needed and allowed. no cap, that’s the name and that’s the whole assignment 💅.

🎀 SYNOPSIS 🎀

int iptunnel_pmtud_check_icmpv6 (struct sk_buff *skb , int mtu );

💅 ARGUMENTS 💅

• skb — the buffer being sent by encapsulation, with L2 headers expected. 🦋
• mtu — the network MTU for the path. 🌸

🌈 RETURN 🌈

• 0 — no ICMPv6 reply. 😌
• the length — if it got built. ✨
• a negative value — on error. 😭

🦋 SEE ALSO 🦋

• Kernel file ./net/ipv4/ip_tunnel_core.c
• iptunnel_pmtud_build_icmp(9)
• iptunnel_pmtud_check_icmp(9)
• iptunnel_pmtud_build_icmpv6(9)
• skb_tunnel_check_pmtu(9)

mwah 💋 — signed off from the ./net/ipv4 source, dated October 2026, in the Kernel API Manual. 💖