ipv6_rearrange_rthdr(9)

✨ NAME ✨

Okay so welcome to ipv6_rearrange_rthdr(9) from the Kernel API Manual, section 9, bestie 💅 — this is the manual page for ipv6_rearrange_rthdr, aka rearrange IPv6 routing header. It’s giving address-order makeover energy, and we’re obsessed 🎀

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🌸 SYNOPSIS 🌸

int ipv6_rearrange_rthdr (struct ipv6hdr *iph , struct ipv6_rt_hdr
       *rthdr );

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🦋 ARGUMENTS 🦋

• iph — the IPv6 header, bestie 💖
• rthdr — the routing header, the other main character in this little address-order situation ✨

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💜 DESCRIPTION 💜

So here’s the vibe: ipv6_rearrange_rthdr rearranges the destination address in iph and the addresses in rthdr so that they appear in the order they will at the final destination. Literally final-destination ordering, no cap 🔥

For the full details, see Appendix A2 of RFC 2402. Iykyk 🧚

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🌈 RETURN 🌈

• 0 — on success, slay 💅
• -EINVAL — if segments_left exceeds the number of addresses described by hdrlen, that’s the error you get 😭

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👑 SEE ALSO 👑

• Kernel file ./net/ipv6/ah6.c
• ipv6_rearrange_destopt(9)

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mwah 💋 — source/version ./net/ipv6, dated October 2026, page ipv6_rearrange_rthdr(9). Bye bestie! 🫶