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/* SPDX-License-Identifier: GPL-2.0 / #ifndef __LINUX_NETLINK_H #define __LINUX_NETLINK_H #include <linux/capability.h> #include <linux/skbuff.h> #include <linux/export.h> #include <net/scm.h> #include <uapi/linux/netlink.h> struct net; static inline struct nlmsghdr nlmsg_hdr(const struct sk_buff skb) { return (struct nlmsghdr )skb->data; } enum netlink_skb_flags { NETLINK_SKB_DST = 0x8, /* Dst set in sendto or sendmsg / }; struct netlink_skb_parms { struct scm_creds creds; / Skb credentials / __u32 portid; __u32 dst_group; __u32 flags; struct sock sk; bool nsid_is_set; int nsid; }; #define NETLINK_CB(skb) ((struct netlink_skb_parms)&((skb)->cb)) #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) void netlink_table_grab(void); void netlink_table_ungrab(void); #define NL_CFG_F_NONROOT_RECV (1 << 0) #define NL_CFG_F_NONROOT_SEND (1 << 1) /* optional Netlink kernel configuration parameters / struct netlink_kernel_cfg { unsigned int groups; unsigned int flags; void (input)(struct sk_buff skb); struct mutex cb_mutex; int (bind)(struct net net, int group); void (unbind)(struct net net, int group); bool (compare)(struct net net, struct sock sk); }; struct sock __netlink_kernel_create(struct net net, int unit, struct module module, struct netlink_kernel_cfg cfg); static inline struct sock netlink_kernel_create(struct net net, int unit, struct netlink_kernel_cfg cfg) { return __netlink_kernel_create(net, unit, THIS_MODULE, cfg); } /* this can be increased when necessary - don't expose to userland / #define NETLINK_MAX_COOKIE_LEN 20 /* * struct netlink_ext_ack - netlink extended ACK report struct * @_msg: message string to report - don't access directly, use * %NL_SET_ERR_MSG * @bad_attr: attribute with error * @cookie: cookie data to return to userspace (for success) * @cookie_len: actual cookie data length / struct netlink_ext_ack { const char _msg; const struct nlattr bad_attr; u8 cookie[NETLINK_MAX_COOKIE_LEN]; u8 cookie_len; }; / Always use this macro, this allows later putting the * message into a separate section or such for things * like translation or listing all possible messages. * Currently string formatting is not supported (due * to the lack of an output buffer.) / #define NL_SET_ERR_MSG(extack, msg) do { \ static const char __msg[] = msg; \ struct netlink_ext_ack __extack = (extack); \ \ if (__extack) \ __extack->_msg = __msg; \ } while (0) #define NL_SET_ERR_MSG_MOD(extack, msg) \ NL_SET_ERR_MSG((extack), KBUILD_MODNAME ": " msg) #define NL_SET_BAD_ATTR(extack, attr) do { \ if ((extack)) \ (extack)->bad_attr = (attr); \ } while (0) #define NL_SET_ERR_MSG_ATTR(extack, attr, msg) do { \ static const char __msg[] = msg; \ struct netlink_ext_ack __extack = (extack); \ \ if (__extack) { \ __extack->_msg = __msg; \ __extack->bad_attr = (attr); \ } \ } while (0) static inline void nl_set_extack_cookie_u64(struct netlink_ext_ack extack, u64 cookie) { u64 __cookie = cookie; memcpy(extack->cookie, &__cookie, sizeof(__cookie)); extack->cookie_len = sizeof(__cookie); } void netlink_kernel_release(struct sock sk); int __netlink_change_ngroups(struct sock sk, unsigned int groups); int netlink_change_ngroups(struct sock sk, unsigned int groups); void __netlink_clear_multicast_users(struct sock sk, unsigned int group); void netlink_ack(struct sk_buff in_skb, struct nlmsghdr nlh, int err, const struct netlink_ext_ack extack); int netlink_has_listeners(struct sock sk, unsigned int group); bool netlink_strict_get_check(struct sk_buff skb); int netlink_unicast(struct sock ssk, struct sk_buff skb, __u32 portid, int nonblock); int netlink_broadcast(struct sock ssk, struct sk_buff skb, __u32 portid, __u32 group, gfp_t allocation); int netlink_broadcast_filtered(struct sock ssk, struct sk_buff skb, __u32 portid, __u32 group, gfp_t allocation, int (filter)(struct sock dsk, struct sk_buff skb, void data), void filter_data); int netlink_set_err(struct sock ssk, __u32 portid, __u32 group, int code); int netlink_register_notifier(struct notifier_block nb); int netlink_unregister_notifier(struct notifier_block nb); / finegrained unicast helpers: / struct sock netlink_getsockbyfilp(struct file filp); int netlink_attachskb(struct sock sk, struct sk_buff skb, long timeo, struct sock ssk); void netlink_detachskb(struct sock sk, struct sk_buff skb); int netlink_sendskb(struct sock sk, struct sk_buff skb); static inline struct sk_buff netlink_skb_clone(struct sk_buff skb, gfp_t gfp_mask) { struct sk_buff nskb; nskb = skb_clone(skb, gfp_mask); if (!nskb) return NULL; /* This is a large skb, set destructor callback to release head / if (is_vmalloc_addr(skb->head)) nskb->destructor = skb->destructor; return nskb; } / * skb should fit one page. This choice is good for headerless malloc. * But we should limit to 8K so that userspace does not have to * use enormous buffer sizes on recvmsg() calls just to avoid * MSG_TRUNC when PAGE_SIZE is very large. / #if PAGE_SIZE < 8192UL #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE) #else #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL) #endif #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN) struct netlink_callback { struct sk_buff skb; const struct nlmsghdr nlh; int (dump)(struct sk_buff * skb, struct netlink_callback cb); int (done)(struct netlink_callback cb); void data; /* the module that dump function belong to / struct module module; struct netlink_ext_ack extack; u16 family; u16 min_dump_alloc; bool strict_check; u16 answer_flags; unsigned int prev_seq, seq; union { u8 ctx[48]; / args is deprecated. Cast a struct over ctx instead * for proper type safety. / long args[6]; }; }; struct netlink_notify { struct net net; u32 portid; int protocol; }; struct nlmsghdr * __nlmsg_put(struct sk_buff skb, u32 portid, u32 seq, int type, int len, int flags); struct netlink_dump_control { int (start)(struct netlink_callback ); int (dump)(struct sk_buff skb, struct netlink_callback ); int (done)(struct netlink_callback ); void data; struct module module; u16 min_dump_alloc; }; int __netlink_dump_start(struct sock ssk, struct sk_buff skb, const struct nlmsghdr nlh, struct netlink_dump_control control); static inline int netlink_dump_start(struct sock ssk, struct sk_buff skb, const struct nlmsghdr nlh, struct netlink_dump_control control) { if (!control->module) control->module = THIS_MODULE; return __netlink_dump_start(ssk, skb, nlh, control); } struct netlink_tap { struct net_device dev; struct module module; struct list_head list; }; int netlink_add_tap(struct netlink_tap nt); int netlink_remove_tap(struct netlink_tap nt); bool __netlink_ns_capable(const struct netlink_skb_parms nsp, struct user_namespace ns, int cap); bool netlink_ns_capable(const struct sk_buff skb, struct user_namespace ns, int cap); bool netlink_capable(const struct sk_buff skb, int cap); bool netlink_net_capable(const struct sk_buff skb, int cap); #endif /* __LINUX_NETLINK_H */

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