STRUCT XT_ACTION_PARAM(9)

okay bestie, welcome to the Kernel API Manual page for struct xt_action_param(9) — yes, the manual name is literally Kernel API Manual, and this is the struct's whole moment. it's giving "parameters for matches/targets" energy, and we're gonna read every single line together. no skipping, no cap. 💖

✨ NAME ✨

struct xt_action_param — parameters for matches/targets. that's the name, that's the vibe, periodt. 🎀

🦋 SYNOPSIS 🦋

struct xt_action_param {
    union {
      const struct xt_match *match;
      const struct xt_target *target;
    };
    union {
      const void *matchinfo, *targinfo;
    };
    const struct nf_hook_state *state;
    unsigned int thoff;
    u16 fragoff;
    bool hotdrop;
 };

🌸 Members 🌸

• {unnamed_union} — anonymous. it's an unnamed union, main character energy but no name bestie. 💅
• match — the match extension. the matchy one.
• target — the target extension. the target-y one.
• {unnamed_union} — anonymous, again. another unnamed union, living its anonymous truth. 🫶
• matchinfo — per-match data. the data that belongs to the match.
• targinfo — per-target data. the data that belongs to the target.
• state — pointer to hook state this packet came from. it's a pointer to the hook state this packet came from, fr fr.
• thoff — position of transport header relative to skb->data. that's the offset, no cap.
• fragoff — packet is a fragment, this is the data offset. so if it's a fragment, this is the data offset.
• hotdrop — drop packet if we had inspection problems. yes bestie, that's the bool for "we had inspection problems, drop it." 💀

💜 Description 💜

Fields written to by extensions:

...and that's literally the description on the page, bestie. it does not list them out. it's giving mystery, not a full bullet list. 😭

👑 SEE ALSO 👑

• Kernel file ./include/linux/netfilter/x_tables.h struct xt_mtchk_param(9), struct xt_mtdtor_param(9), struct xt_tgchk_param(9), var xt_recseq(9), xt_write_recseq_begin(9), xt_write_recseq_end(9)

xoxo, your kernel bestie 💅 — this page is from Kernel API Manual, page struct xt_action_param(9), source path ./include/linux/netfilter, dated October 2026. slay and stay iconic. 💖