IP_RETOPTS(2const)

✨ IP_RETOPTS ✨

okay so bestie, welcome to IP_RETOPTS(2const) — yes it's a section 2 const page, iykyk 💅

🌸 NAME 🌸

IP_RETOPTS — receive most incoming IP options in control message 🎀

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📚 LIBRARY 📚

Standard C library (libc, -lc) 🫶

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🦋 SYNOPSIS 🦋

#include <netinet/in.h>  /* Definition of IP* constants */
#include <sys/socket.h>

int setsockopt(int sockfd, IPPROTO_IP, IP_RETOPTS,
               const int *enabled, sizeof(int));

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💖 DESCRIPTION 💖

So this one is literally identical to IP_RECVOPTS(2const) — like, same energy, same behaviour — except it hands you back the raw, unprocessed options instead of the cooked version. And by raw i mean: the timestamp and route record options are not filled in for this hop. not filled in, periodt. 🫣

important bestie: this is not supported for SOCK_STREAM sockets 💀 don't try it, it's giving undefined behaviour.

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😭 ERRORS 😭

for the error tea, go check IPPROTO_IP(2const). also check setsockopt(2). also check ip(7). that's the trio, no cap 📖✨

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👑 HISTORY 👑

Linux 2.2 — yeah she's a vintage icon, been here since the olden days 🕰️💜

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🔥 SEE ALSO 🔥

• IPPROTO_IP(2const)
• setsockopt(2)
• ip(7)

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and that's the whole vibe, bestie — go forth and read your IP options raw, main character energy only 👑🌈

with love, from the Linux man-pages 6.20 girlies, dated 2025-11-25 🎀💖