diff options
Diffstat (limited to 'include/linux/netfilter/nfnetlink.h')
-rw-r--r-- | include/linux/netfilter/nfnetlink.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/include/linux/netfilter/nfnetlink.h b/include/linux/netfilter/nfnetlink.h new file mode 100644 index 000000000..e9a9ab34a --- /dev/null +++ b/include/linux/netfilter/nfnetlink.h @@ -0,0 +1,108 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _NFNETLINK_H +#define _NFNETLINK_H + +#include <linux/netlink.h> +#include <linux/capability.h> +#include <net/netlink.h> +#include <uapi/linux/netfilter/nfnetlink.h> + +struct nfnl_info { + struct net *net; + struct sock *sk; + const struct nlmsghdr *nlh; + const struct nfgenmsg *nfmsg; + struct netlink_ext_ack *extack; +}; + +enum nfnl_callback_type { + NFNL_CB_UNSPEC = 0, + NFNL_CB_MUTEX, + NFNL_CB_RCU, + NFNL_CB_BATCH, +}; + +struct nfnl_callback { + int (*call)(struct sk_buff *skb, const struct nfnl_info *info, + const struct nlattr * const cda[]); + const struct nla_policy *policy; + enum nfnl_callback_type type; + __u16 attr_count; +}; + +enum nfnl_abort_action { + NFNL_ABORT_NONE = 0, + NFNL_ABORT_AUTOLOAD, + NFNL_ABORT_VALIDATE, +}; + +struct nfnetlink_subsystem { + const char *name; + __u8 subsys_id; /* nfnetlink subsystem ID */ + __u8 cb_count; /* number of callbacks */ + const struct nfnl_callback *cb; /* callback for individual types */ + struct module *owner; + int (*commit)(struct net *net, struct sk_buff *skb); + int (*abort)(struct net *net, struct sk_buff *skb, + enum nfnl_abort_action action); + bool (*valid_genid)(struct net *net, u32 genid); +}; + +int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n); +int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n); + +int nfnetlink_has_listeners(struct net *net, unsigned int group); +int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 portid, + unsigned int group, int echo, gfp_t flags); +int nfnetlink_set_err(struct net *net, u32 portid, u32 group, int error); +int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid); +void nfnetlink_broadcast(struct net *net, struct sk_buff *skb, __u32 portid, + __u32 group, gfp_t allocation); + +static inline u16 nfnl_msg_type(u8 subsys, u8 msg_type) +{ + return subsys << 8 | msg_type; +} + +static inline void nfnl_fill_hdr(struct nlmsghdr *nlh, u8 family, u8 version, + __be16 res_id) +{ + struct nfgenmsg *nfmsg; + + nfmsg = nlmsg_data(nlh); + nfmsg->nfgen_family = family; + nfmsg->version = version; + nfmsg->res_id = res_id; +} + +static inline struct nlmsghdr *nfnl_msg_put(struct sk_buff *skb, u32 portid, + u32 seq, int type, int flags, + u8 family, u8 version, + __be16 res_id) +{ + struct nlmsghdr *nlh; + + nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags); + if (!nlh) + return NULL; + + nfnl_fill_hdr(nlh, family, version, res_id); + + return nlh; +} + +void nfnl_lock(__u8 subsys_id); +void nfnl_unlock(__u8 subsys_id); +#ifdef CONFIG_PROVE_LOCKING +bool lockdep_nfnl_is_held(__u8 subsys_id); +#else +static inline bool lockdep_nfnl_is_held(__u8 subsys_id) +{ + return true; +} +#endif /* CONFIG_PROVE_LOCKING */ + +#define MODULE_ALIAS_NFNL_SUBSYS(subsys) \ + MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys)) + +#endif /* _NFNETLINK_H */ |