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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _NFNETLINK_H3#define _NFNETLINK_H4 5#include <linux/netlink.h>6#include <linux/capability.h>7#include <net/netlink.h>8#include <uapi/linux/netfilter/nfnetlink.h>9 10struct nfnl_info {11 struct net *net;12 struct sock *sk;13 const struct nlmsghdr *nlh;14 const struct nfgenmsg *nfmsg;15 struct netlink_ext_ack *extack;16};17 18enum nfnl_callback_type {19 NFNL_CB_UNSPEC = 0,20 NFNL_CB_MUTEX,21 NFNL_CB_RCU,22 NFNL_CB_BATCH,23};24 25struct nfnl_callback {26 int (*call)(struct sk_buff *skb, const struct nfnl_info *info,27 const struct nlattr * const cda[]);28 const struct nla_policy *policy;29 enum nfnl_callback_type type;30 __u16 attr_count;31};32 33enum nfnl_abort_action {34 NFNL_ABORT_NONE = 0,35 NFNL_ABORT_AUTOLOAD,36 NFNL_ABORT_VALIDATE,37};38 39struct nfnetlink_subsystem {40 const char *name;41 __u8 subsys_id; /* nfnetlink subsystem ID */42 __u8 cb_count; /* number of callbacks */43 const struct nfnl_callback *cb; /* callback for individual types */44 struct module *owner;45 int (*commit)(struct net *net, struct sk_buff *skb);46 int (*abort)(struct net *net, struct sk_buff *skb,47 enum nfnl_abort_action action);48 bool (*valid_genid)(struct net *net, u32 genid);49};50 51int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n);52int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n);53 54int nfnetlink_has_listeners(struct net *net, unsigned int group);55int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 portid,56 unsigned int group, int echo, gfp_t flags);57int nfnetlink_set_err(struct net *net, u32 portid, u32 group, int error);58int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid);59void nfnetlink_broadcast(struct net *net, struct sk_buff *skb, __u32 portid,60 __u32 group, gfp_t allocation);61 62static inline u16 nfnl_msg_type(u8 subsys, u8 msg_type)63{64 return subsys << 8 | msg_type;65}66 67static inline void nfnl_fill_hdr(struct nlmsghdr *nlh, u8 family, u8 version,68 __be16 res_id)69{70 struct nfgenmsg *nfmsg;71 72 nfmsg = nlmsg_data(nlh);73 nfmsg->nfgen_family = family;74 nfmsg->version = version;75 nfmsg->res_id = res_id;76}77 78static inline struct nlmsghdr *nfnl_msg_put(struct sk_buff *skb, u32 portid,79 u32 seq, int type, int flags,80 u8 family, u8 version,81 __be16 res_id)82{83 struct nlmsghdr *nlh;84 85 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);86 if (!nlh)87 return NULL;88 89 nfnl_fill_hdr(nlh, family, version, res_id);90 91 return nlh;92}93 94void nfnl_lock(__u8 subsys_id);95void nfnl_unlock(__u8 subsys_id);96#ifdef CONFIG_PROVE_LOCKING97bool lockdep_nfnl_is_held(__u8 subsys_id);98#else99static inline bool lockdep_nfnl_is_held(__u8 subsys_id)100{101 return true;102}103#endif /* CONFIG_PROVE_LOCKING */104 105#define MODULE_ALIAS_NFNL_SUBSYS(subsys) \106 MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))107 108#endif /* _NFNETLINK_H */109