STRUCT XT_MTCHK_PARAM(9)

💅 struct xt_mtchk_param(9) — the Kernel API Manual glow-up ✨

okay so bestie, welcome to the <pink>Kernel API Manual</pink> entry for struct xt_mtchk_param, which — say it with me — holds the parameters for match extensions' checkentry functions. that's it, that's the vibe. she's a little struct with big main character energy 🎀

✨ SYNOPSIS ✨

struct xt_mtchk_param {
    struct net *net;
    const char *table;
    const void *entryinfo;
    const struct xt_match *match;
    void *matchinfo;
    unsigned int hook_mask;
    u_int8_t family;
    bool nft_compat;
 };

literally just a struct, no cap. now let's meet the members one by one, because they all ate 💅

🫶 Members 🫶

• net — the network namespace through which the check was invoked 🌐 like, which world are we doing this in
• table — the table the rule is tried to be inserted into 📋 that's the target, bestie
• entryinfo — the family-specific rule data. it's one of struct ipt_ip, ip6t_ip, arpt_arp, or — note this — ebt_entry 👀 yeah, that last one's the little exception, don't forget her
• match — the struct xt_match through which this function was invoked 🧚 she's the one who called, basically
• matchinfo — per-match data 🍓 tiny, personal, just for this match
• hook_mask — via which hooks the new rule is reachable 🪝 the whole map of where this rule can be hit
• family — the actual NFPROTO_* through which the function is invoked. highkey helpful when match->family == NFPROTO_UNSPEC 😭 like when the match is being all mysterious about its family, this tells you the truth
• nft_compat — true if we're running from the nft compat layer 🧚‍♀️✨ otherwise it's just false and living its life

🌈 SEE ALSO 🌈

• Kernel file ./include/linux/netfilter/x_tables.h
• struct xt_action_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)

go read those too, iykyk, they're all in the same friend group 🫶

okay that's the whole page, you're officially educated 💖 this was struct xt_mtchk_param(9), straight out of ./include/linux/netfilter, dated October 2026 — periodt, see you in the next manpage bestie 🌸👑