STRUCT GENL_SPLIT_OPS(9)

💅 struct genl_split_ops

okay so bestie, welcome to the Kernel API Manual ✨ — this is the page for struct genl_split_ops, aka generic netlink operations, do/dump split version. It’s giving “one struct, two callback personalities,” and we’re gonna walk through every member, no cap. 🦋

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🌸 NAME

struct genl_split_ops — generic netlink operations (do/dump split version) 💖

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🦋 SYNOPSIS

struct genl_split_ops {
    union {
      struct {
        int (*pre_doit)(const struct genl_split_ops *ops, struct sk_buff *skb, struct genl_info *info);
        int (*doit)(struct sk_buff *skb, struct genl_info *info);
        void (*post_doit)(const struct genl_split_ops *ops, struct sk_buff *skb, struct genl_info *info);
      };
      struct {
        int (*start)(struct netlink_callback *cb);
        int (*dumpit)(struct sk_buff *skb, struct netlink_callback *cb);
        int (*done)(struct netlink_callback *cb);
      };
    };
    const struct nla_policy *policy;
    unsigned int            maxattr;
    u8 cmd;
    u8 internal_flags;
    u8 flags;
    u8 validate;
};

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🫶 Members

• {unnamed_union} — anonymous. literally an unnamed union doing its anonymous-union thing 💅
• {unnamed_struct} — anonymous.
• pre_doit — called before an operation’s doit callback; it may do additional, common, filtering and return an error 🎀
• doit — standard command callback ✨
• post_doit — called after an operation’s doit callback; it may undo operations done by pre_doit, for example release locks 🔓
• {unnamed_struct} — anonymous.
• start — start callback for dumps 🌊
• dumpit — callback for dumpers 🌀
• done — completion callback for dumps ✅
• policy — netlink policy (takes precedence over family policy) 👑
• maxattr — maximum number of attributes supported 🔢
• cmd — command identifier 🏷️
• internal_flags — flags used by the family 🚩
• flags — GENL_* flags (GENL_ADMIN_PERM or GENL_UNS_ADMIN_PERM) 🔥
• validate — validation flags from enum genl_validate_flags 🧚

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💖 Description

✨ Do callbacks:

These are the do-side slots — the pre_doit, doit, and post_doit energy from the union above. 💅

🌊 Dump callbacks:

These are the dump-side slots — the start, dumpit, and done energy. 🌀

Do callbacks can be used if GENL_CMD_CAP_DO is set in flags. Dump callbacks can be used if GENL_CMD_CAP_DUMP is set in flags. Exactly one of those flags must be set. not zero, not both — exactly one. periodt. 💀

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🌈 SEE ALSO

the whole reference squad is here, bestie — the kernel file ./include/net/genetlink.h plus these icons:

• struct genl_multicast_group(9)
• struct genl_family(9)
• struct genl_info(9)
• struct genl_small_ops(9)
• struct genl_ops(9)
• struct genl_dumpit_info(9)
• genl_info_init_ntf(9)
• genlmsg_iput(9)
• genlmsg_nlhdr(9)
• genlmsg_parse_deprecated(9)
• genlmsg_parse(9)
• genl_dump_check_consistent(9)
• genlmsg_put_reply(9)
• genlmsg_end(9)
• genlmsg_cancel(9)
• genlmsg_multicast_netns_filtered(9)
• genlmsg_multicast_netns(9)
• genlmsg_multicast(9)
• genlmsg_multicast_allns(9)
• genlmsg_unicast(9)
• genlmsg_reply(9)
• genlmsg_data(9)
• genlmsg_len(9)
• genlmsg_msg_size(9)
• genlmsg_total_size(9)
• genlmsg_new(9)
• genl_set_err(9)

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okay bye bestie 💋 — this one’s from source/version ./include/net, dated October 2026, and yes the page is struct genl_split_ops(9). 🎀✨