nlmsg(3)

📦
version 1.0.5 · 4 versions
, in ubuntu noble, ubuntu questing, ubuntu resolute, ubuntu stonking

okay so bestie, welcome to nlmsg, the Netlink message helper functions from the libnetfilter_queue manual, section 3 (that's the library functions section, iykyk). this is a lil' page, only two functions, but they're lowkey doing the Lord's work. let's get into it ✨

🌸 NAME 🌸

nlmsg — Netlink message helper functions. that's it, that's the whole vibe. two little helpers that make Netlink messages behave. 🦋

✨ SYNOPSIS ✨

🎀 Functions 🎀

here's the lineup, no notes:

int nfq_nlmsg_parse (const struct nlmsghdr *nlh, struct nlattr **attr)
struct nlmsghdr * nfq_nlmsg_put (char *buf, int type, uint32_t queue_num)

two baddies. one parses, one puts. balance. 🌈

💅 Detailed Description 💅

so like, the detailed description section is literally just the function documentation chilling below it. no extra lore. the real content is in the functions themselves, so let's go 🫶

👑 Function Documentation 👑

⭐ int nfq_nlmsg_parse (const struct nlmsghdr * nlh, struct nlattr ** attr)

nfq_nlmsg_parse — it sets packet attributes from a netlink message. like, you hand it the message, it fills in your attribute array. main character energy fr fr. 💫

Parameters

  • nlh — Pointer to netlink message. yes bestie, that message.
  • attr — Pointer to array of attributes to set. it's gonna write into this one, so have it ready. 🙈

Returns

  • MNL_CB_OK on success 💚 — slay.
  • MNL_CB_ERROR if any error occurs 😭 — not slay, but at least you know.
Definition at line 269 of file nlmsg.c. 📍 noted, bestie, don't lose it.

⭐ struct nlmsghdr * nfq_nlmsg_put (char * buf, int type, uint32_t queue_num)

nfq_nlmsg_put — it converts a memory buffer into a Netlink buffer. glow-up but for bytes. ✨

Parameters

  • *buf — Pointer to memory buffer. the before picture. 🎀
  • type — Either NFQNL_MSG_CONFIG or NFQNL_MSG_VERDICT. pick one, bestie, those are your two options, no cap. 🦋
  • queue_num — Queue number. the queue in question. 💜

Returns

  • Pointer to netlink message. that's the after picture. iconic. 👑
Definition at line 283 of file nlmsg.c. 📍 second bookmark, you're welcome.

🌸 Author 🌸

Generated automatically by Doxygen for libnetfilter_queue from the source code. so technically Doxygen wrote this, I just gave it a makeover. 💅

and that's the whole page, bestie!! this is from libnetfilter_queue, Version 1.0.5, and it's the nlmsg(3) page in the library functions manual — dated right there with that version, so if you're reading this, you're on 1.0.5 era. go forth and parse those netlink messages, you absolute legend 🫶✨💖🎀🦋🌸

📦 where this page comes from