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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef _NFNETLINK_H |
| 3 | #define _NFNETLINK_H |
| 4 | |
| 5 | #include <linux/netlink.h> |
| 6 | #include <linux/capability.h> |
| 7 | #include <net/netlink.h> |
| 8 | #include <uapi/linux/netfilter/nfnetlink.h> |
| 9 | |
| 10 | struct 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 | |
| 18 | enum nfnl_callback_type { |
| 19 | NFNL_CB_UNSPEC = 0, |
| 20 | NFNL_CB_MUTEX, |
| 21 | NFNL_CB_RCU, |
| 22 | NFNL_CB_BATCH, |
| 23 | }; |
| 24 | |
| 25 | struct 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 | |
| 33 | enum nfnl_abort_action { |
| 34 | NFNL_ABORT_NONE = 0, |
| 35 | NFNL_ABORT_AUTOLOAD, |
| 36 | NFNL_ABORT_VALIDATE, |
| 37 | }; |
| 38 | |
| 39 | struct 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 | |
| 51 | int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n); |
| 52 | int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n); |
| 53 | |
| 54 | int nfnetlink_has_listeners(struct net *net, unsigned int group); |
| 55 | int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 portid, |
| 56 | unsigned int group, int echo, gfp_t flags); |
| 57 | int nfnetlink_set_err(struct net *net, u32 portid, u32 group, int error); |
| 58 | int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u32 portid); |
| 59 | void nfnetlink_broadcast(struct net *net, struct sk_buff *skb, __u32 portid, |
| 60 | __u32 group, gfp_t allocation); |
| 61 | |
| 62 | static inline u16 nfnl_msg_type(u8 subsys, u8 msg_type) |
| 63 | { |
| 64 | return subsys << 8 | msg_type; |
| 65 | } |
| 66 | |
| 67 | static 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 | |
| 78 | static 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 | |
| 94 | void nfnl_lock(__u8 subsys_id); |
| 95 | void nfnl_unlock(__u8 subsys_id); |
| 96 | #ifdef CONFIG_PROVE_LOCKING |
| 97 | bool lockdep_nfnl_is_held(__u8 subsys_id); |
| 98 | #else |
| 99 | static 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 |
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