/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _NFNETLINK_H
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#define _NFNETLINK_H
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#include <linux/netlink.h>
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#include <linux/capability.h>
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#include <linux/android_kabi.h>
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#include <net/netlink.h>
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#include <uapi/linux/netfilter/nfnetlink.h>
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struct nfnl_callback {
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int (*call)(struct net *net, struct sock *nl, struct sk_buff *skb,
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const struct nlmsghdr *nlh,
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const struct nlattr * const cda[],
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struct netlink_ext_ack *extack);
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int (*call_rcu)(struct net *net, struct sock *nl, struct sk_buff *skb,
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const struct nlmsghdr *nlh,
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const struct nlattr * const cda[],
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struct netlink_ext_ack *extack);
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int (*call_batch)(struct net *net, struct sock *nl, struct sk_buff *skb,
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const struct nlmsghdr *nlh,
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const struct nlattr * const cda[],
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struct netlink_ext_ack *extack);
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const struct nla_policy *policy; /* netlink attribute policy */
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const u_int16_t attr_count; /* number of nlattr's */
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ANDROID_KABI_RESERVE(1);
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};
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enum nfnl_abort_action {
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NFNL_ABORT_NONE = 0,
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NFNL_ABORT_AUTOLOAD,
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NFNL_ABORT_VALIDATE,
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};
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struct nfnetlink_subsystem {
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const char *name;
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__u8 subsys_id; /* nfnetlink subsystem ID */
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__u8 cb_count; /* number of callbacks */
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const struct nfnl_callback *cb; /* callback for individual types */
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struct module *owner;
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int (*commit)(struct net *net, struct sk_buff *skb);
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int (*abort)(struct net *net, struct sk_buff *skb,
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enum nfnl_abort_action action);
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void (*cleanup)(struct net *net);
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bool (*valid_genid)(struct net *net, u32 genid);
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ANDROID_KABI_RESERVE(1);
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};
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int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n);
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int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n);
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int nfnetlink_has_listeners(struct net *net, unsigned int group);
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int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 portid,
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unsigned int group, int echo, gfp_t flags);
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int nfnetlink_set_err(struct net *net, u32 portid, u32 group, int error);
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int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid);
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static inline u16 nfnl_msg_type(u8 subsys, u8 msg_type)
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{
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return subsys << 8 | msg_type;
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}
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static inline void nfnl_fill_hdr(struct nlmsghdr *nlh, u8 family, u8 version,
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__be16 res_id)
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{
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struct nfgenmsg *nfmsg;
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nfmsg = nlmsg_data(nlh);
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nfmsg->nfgen_family = family;
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nfmsg->version = version;
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nfmsg->res_id = res_id;
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}
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static inline struct nlmsghdr *nfnl_msg_put(struct sk_buff *skb, u32 portid,
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u32 seq, int type, int flags,
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u8 family, u8 version,
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__be16 res_id)
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{
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struct nlmsghdr *nlh;
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nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
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if (!nlh)
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return NULL;
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nfnl_fill_hdr(nlh, family, version, res_id);
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return nlh;
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}
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void nfnl_lock(__u8 subsys_id);
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void nfnl_unlock(__u8 subsys_id);
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#ifdef CONFIG_PROVE_LOCKING
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bool lockdep_nfnl_is_held(__u8 subsys_id);
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#else
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static inline bool lockdep_nfnl_is_held(__u8 subsys_id)
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{
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return true;
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}
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#endif /* CONFIG_PROVE_LOCKING */
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#define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
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MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))
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#endif /* _NFNETLINK_H */
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