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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; void do_trace_netlink_extack(const char *msg); 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) #define NETLINK_CTX_SIZE 48 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); int (*bind)(struct net *net, int group); void (*unbind)(struct net *net, int group); void (*release) (struct sock *sk, unsigned long *groups); }; 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 #define NETLINK_MAX_FMTMSG_LEN 80 /** * 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 * @policy: policy for a bad attribute * @miss_type: attribute type which was missing * @miss_nest: nest missing an attribute (%NULL if missing top level attr) * @cookie: cookie data to return to userspace (for success) * @cookie_len: actual cookie data length * @_msg_buf: output buffer for formatted message strings - don't access * directly, use %NL_SET_ERR_MSG_FMT */ struct netlink_ext_ack { const char *_msg; const struct nlattr *bad_attr; const struct nla_policy *policy; const struct nlattr *miss_nest; u16 miss_type; u8 cookie[NETLINK_MAX_COOKIE_LEN]; u8 cookie_len; char _msg_buf[NETLINK_MAX_FMTMSG_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. * If string formatting is needed use NL_SET_ERR_MSG_FMT. */ #define NL_SET_ERR_MSG(extack, msg) do { \ static const char __msg[] = msg; \ struct netlink_ext_ack *__extack = (extack); \ \ do_trace_netlink_extack(__msg); \ \ if (__extack) \ __extack->_msg = __msg; \ } while (0) /* We splice fmt with %s at each end even in the snprintf so that both calls * can use the same string constant, avoiding its duplication in .ro */ #define NL_SET_ERR_MSG_FMT(extack, fmt, args...) do { \ struct netlink_ext_ack *__extack = (extack); \ \ if (!__extack) \ break; \ if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \ "%s" fmt "%s", "", ##args, "") >= \ NETLINK_MAX_FMTMSG_LEN) \ net_warn_ratelimited("%s" fmt "%s", "truncated extack: ", \ ##args, "\n"); \ \ do_trace_netlink_extack(__extack->_msg_buf); \ \ __extack->_msg = __extack->_msg_buf; \ } while (0) #define NL_SET_ERR_MSG_MOD(extack, msg) \ NL_SET_ERR_MSG((extack), KBUILD_MODNAME ": " msg) #define NL_SET_ERR_MSG_FMT_MOD(extack, fmt, args...) \ NL_SET_ERR_MSG_FMT((extack), KBUILD_MODNAME ": " fmt, ##args) #define NL_SET_ERR_MSG_WEAK(extack, msg) do { \ if ((extack) && !(extack)->_msg) \ NL_SET_ERR_MSG((extack), msg); \ } while (0) #define NL_SET_ERR_MSG_WEAK_MOD(extack, msg) do { \ if ((extack) && !(extack)->_msg) \ NL_SET_ERR_MSG_MOD((extack), msg); \ } while (0) #define NL_SET_BAD_ATTR_POLICY(extack, attr, pol) do { \ if ((extack)) { \ (extack)->bad_attr = (attr); \ (extack)->policy = (pol); \ } \ } while (0) #define NL_SET_BAD_ATTR(extack, attr) NL_SET_BAD_ATTR_POLICY(extack, attr, NULL) #define NL_SET_ERR_MSG_ATTR_POL(extack, attr, pol, msg) do { \ static const char __msg[] = msg; \ struct netlink_ext_ack *__extack = (extack); \ \ do_trace_netlink_extack(__msg); \ \ if (__extack) { \ __extack->_msg = __msg; \ __extack->bad_attr = (attr); \ __extack->policy = (pol); \ } \ } while (0) #define NL_SET_ERR_MSG_ATTR_POL_FMT(extack, attr, pol, fmt, args...) do { \ struct netlink_ext_ack *__extack = (extack); \ \ if (!__extack) \ break; \ \ if (snprintf(__extack->_msg_buf, NETLINK_MAX_FMTMSG_LEN, \ "%s" fmt "%s", "", ##args, "") >= \ NETLINK_MAX_FMTMSG_LEN) \ net_warn_ratelimited("%s" fmt "%s", "truncated extack: ", \ ##args, "\n"); \ \ do_trace_netlink_extack(__extack->_msg_buf); \ \ __extack->_msg = __extack->_msg_buf; \ __extack->bad_attr = (attr); \ __extack->policy = (pol); \ } while (0) #define NL_SET_ERR_MSG_ATTR(extack, attr, msg) \ NL_SET_ERR_MSG_ATTR_POL(extack, attr, NULL, msg) #define NL_SET_ERR_MSG_ATTR_FMT(extack, attr, msg, args...) \ NL_SET_ERR_MSG_ATTR_POL_FMT(extack, attr, NULL, msg, ##args) #define NL_SET_ERR_ATTR_MISS(extack, nest, type) do { \ struct netlink_ext_ack *__extack = (extack); \ \ if (__extack) { \ __extack->miss_nest = (nest); \ __extack->miss_type = (type); \ } \ } while (0) #define NL_REQ_ATTR_CHECK(extack, nest, tb, type) ({ \ struct nlattr **__tb = (tb); \ u32 __attr = (type); \ int __retval; \ \ __retval = !__tb[__attr]; \ if (__retval) \ NL_SET_ERR_ATTR_MISS((extack), (nest), __attr); \ __retval; \ }) static inline void nl_set_extack_cookie_u64(struct netlink_ext_ack *extack, u64 cookie) { if (!extack) return; 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); typedef int (*netlink_filter_fn)(struct sock *dsk, struct sk_buff *skb, void *data); int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, __u32 portid, __u32 group, gfp_t allocation, netlink_filter_fn filter, 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_getsockbyfd(int fd); 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 answer_flags; u32 min_dump_alloc; unsigned int prev_seq, seq; int flags; bool strict_check; union { u8 ctx[NETLINK_CTX_SIZE]; /* args is deprecated. Cast a struct over ctx instead * for proper type safety. */ long args[6]; }; }; #define NL_ASSERT_CTX_FITS(type_name) \ BUILD_BUG_ON(sizeof(type_name) > \ sizeof_field(struct netlink_callback, ctx)) 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 *); struct netlink_ext_ack *extack; void *data; struct module *module; u32 min_dump_alloc; int flags; }; 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); struct sk_buff *netlink_alloc_large_skb(unsigned int size, int broadcast); #endif /* __LINUX_NETLINK_H */