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Diffstat (limited to '')
| -rw-r--r-- | include/libnetlink.h | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/include/libnetlink.h b/include/libnetlink.h new file mode 100644 index 0000000..c91a223 --- /dev/null +++ b/include/libnetlink.h @@ -0,0 +1,357 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __LIBNETLINK_H__ +#define __LIBNETLINK_H__ 1 + +#include <stdio.h> +#include <string.h> +#include <asm/types.h> +#include <linux/netlink.h> +#include <linux/rtnetlink.h> +#include <linux/if_link.h> +#include <linux/if_addr.h> +#include <linux/neighbour.h> +#include <linux/netconf.h> +#include <arpa/inet.h> + +struct rtnl_handle { + int fd; + struct sockaddr_nl local; + struct sockaddr_nl peer; + __u32 seq; + __u32 dump; + int proto; + FILE *dump_fp; +#define RTNL_HANDLE_F_LISTEN_ALL_NSID 0x01 +#define RTNL_HANDLE_F_SUPPRESS_NLERR 0x02 +#define RTNL_HANDLE_F_STRICT_CHK 0x04 + int flags; +}; + +struct nlmsg_list { + struct nlmsg_list *next; + struct nlmsghdr h; +}; + +struct nlmsg_chain { + struct nlmsg_list *head; + struct nlmsg_list *tail; +}; + +struct ipstats_req { + struct nlmsghdr nlh; + struct if_stats_msg ifsm; + char buf[128]; +}; + +extern int rcvbuf; + +int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions) + __attribute__((warn_unused_result)); + +int rtnl_open_byproto(struct rtnl_handle *rth, unsigned int subscriptions, + int protocol) + __attribute__((warn_unused_result)); +int rtnl_add_nl_group(struct rtnl_handle *rth, unsigned int group) + __attribute__((warn_unused_result)); +void rtnl_close(struct rtnl_handle *rth); +void rtnl_set_strict_dump(struct rtnl_handle *rth); + +typedef int (*req_filter_fn_t)(struct nlmsghdr *nlh, int reqlen); + +int rtnl_addrdump_req(struct rtnl_handle *rth, int family, + req_filter_fn_t filter_fn) + __attribute__((warn_unused_result)); +int rtnl_addrlbldump_req(struct rtnl_handle *rth, int family) + __attribute__((warn_unused_result)); +int rtnl_routedump_req(struct rtnl_handle *rth, int family, + req_filter_fn_t filter_fn) + __attribute__((warn_unused_result)); +int rtnl_ruledump_req(struct rtnl_handle *rth, int family) + __attribute__((warn_unused_result)); +int rtnl_neighdump_req(struct rtnl_handle *rth, int family, + req_filter_fn_t filter_fn) + __attribute__((warn_unused_result)); +int rtnl_neightbldump_req(struct rtnl_handle *rth, int family) + __attribute__((warn_unused_result)); +int rtnl_mdbdump_req(struct rtnl_handle *rth, int family) + __attribute__((warn_unused_result)); +int rtnl_brvlandump_req(struct rtnl_handle *rth, int family, __u32 dump_flags) + __attribute__((warn_unused_result)); +int rtnl_netconfdump_req(struct rtnl_handle *rth, int family) + __attribute__((warn_unused_result)); + +int rtnl_linkdump_req(struct rtnl_handle *rth, int fam) + __attribute__((warn_unused_result)); +int rtnl_linkdump_req_filter(struct rtnl_handle *rth, int fam, __u32 filt_mask) + __attribute__((warn_unused_result)); + +int rtnl_linkdump_req_filter_fn(struct rtnl_handle *rth, int fam, + req_filter_fn_t fn) + __attribute__((warn_unused_result)); +int rtnl_fdb_linkdump_req_filter_fn(struct rtnl_handle *rth, + req_filter_fn_t filter_fn) + __attribute__((warn_unused_result)); +int rtnl_nsiddump_req_filter_fn(struct rtnl_handle *rth, int family, + req_filter_fn_t filter_fn) + __attribute__((warn_unused_result)); +int rtnl_statsdump_req_filter(struct rtnl_handle *rth, int fam, __u32 filt_mask, + int (*filter_fn)(struct ipstats_req *req, + void *data), + void *filter_data) + __attribute__((warn_unused_result)); +int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, + int len) + __attribute__((warn_unused_result)); +int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n) + __attribute__((warn_unused_result)); + +int rtnl_nexthopdump_req(struct rtnl_handle *rth, int family, + req_filter_fn_t filter_fn) + __attribute__((warn_unused_result)); +int rtnl_nexthop_bucket_dump_req(struct rtnl_handle *rth, int family, + req_filter_fn_t filter_fn) + __attribute__((warn_unused_result)); + +int rtnl_tunneldump_req(struct rtnl_handle *rth, int family, int ifindex, + __u8 flags) + __attribute__((warn_unused_result)); + +struct rtnl_ctrl_data { + int nsid; +}; + +typedef int (*rtnl_filter_t)(struct nlmsghdr *n, void *); + +/** + * rtnl error handler called from + * rtnl_dump_done() + * rtnl_dump_error() + * + * Return value is a bitmask of the following values: + * RTNL_LET_NLERR + * error handled as usual + * RTNL_SUPPRESS_NLMSG_DONE_NLERR + * error in nlmsg_type == NLMSG_DONE will be suppressed + * RTNL_SUPPRESS_NLMSG_ERROR_NLERR + * error in nlmsg_type == NLMSG_ERROR will be suppressed + * and nlmsg will be skipped + * RTNL_SUPPRESS_NLERR - suppress error in both previous cases + */ +#define RTNL_LET_NLERR 0x01 +#define RTNL_SUPPRESS_NLMSG_DONE_NLERR 0x02 +#define RTNL_SUPPRESS_NLMSG_ERROR_NLERR 0x04 +#define RTNL_SUPPRESS_NLERR 0x06 +typedef int (*rtnl_err_hndlr_t)(struct nlmsghdr *n, void *); + +typedef int (*rtnl_listen_filter_t)(struct rtnl_ctrl_data *, + struct nlmsghdr *n, void *); + +typedef int (*nl_ext_ack_fn_t)(const char *errmsg, uint32_t off, + const struct nlmsghdr *inner_nlh); + +struct rtnl_dump_filter_arg { + rtnl_filter_t filter; + void *arg1; + rtnl_err_hndlr_t errhndlr; + void *arg2; + __u16 nc_flags; +}; + +int rtnl_dump_filter_nc(struct rtnl_handle *rth, + rtnl_filter_t filter, + void *arg, __u16 nc_flags); +#define rtnl_dump_filter(rth, filter, arg) \ + rtnl_dump_filter_nc(rth, filter, arg, 0) +int rtnl_dump_filter_errhndlr_nc(struct rtnl_handle *rth, + rtnl_filter_t filter, + void *arg1, + rtnl_err_hndlr_t errhndlr, + void *arg2, + __u16 nc_flags); +#define rtnl_dump_filter_errhndlr(rth, filter, farg, errhndlr, earg) \ + rtnl_dump_filter_errhndlr_nc(rth, filter, farg, errhndlr, earg, 0) + +int rtnl_echo_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, int json, + int (*print_info)(struct nlmsghdr *n, void *arg)) + __attribute__((warn_unused_result)); +int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, + struct nlmsghdr **answer) + __attribute__((warn_unused_result)); +int rtnl_talk_iov(struct rtnl_handle *rtnl, struct iovec *iovec, size_t iovlen, + struct nlmsghdr **answer) + __attribute__((warn_unused_result)); +int rtnl_talk_suppress_rtnl_errmsg(struct rtnl_handle *rtnl, struct nlmsghdr *n, + struct nlmsghdr **answer) + __attribute__((warn_unused_result)); +int rtnl_send(struct rtnl_handle *rth, const void *buf, int) + __attribute__((warn_unused_result)); +int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int) + __attribute__((warn_unused_result)); +int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn); +int nl_dump_ext_ack_done(const struct nlmsghdr *nlh, unsigned int offset, int error); + +int addattr(struct nlmsghdr *n, int maxlen, int type); +int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data); +int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data); +int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data); +int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data); +int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data); + +int addattr_l(struct nlmsghdr *n, int maxlen, int type, + const void *data, int alen); +int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len); +struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type); +int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest); +struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type, + const void *data, int len); +int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest); +int rta_addattr8(struct rtattr *rta, int maxlen, int type, __u8 data); +int rta_addattr16(struct rtattr *rta, int maxlen, int type, __u16 data); +int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data); +int rta_addattr64(struct rtattr *rta, int maxlen, int type, __u64 data); +int rta_addattr_l(struct rtattr *rta, int maxlen, int type, + const void *data, int alen); + +int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len); +int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta, + int len, unsigned short flags); +struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len); +int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, int len); + +struct rtattr *rta_nest(struct rtattr *rta, int maxlen, int type); +int rta_nest_end(struct rtattr *rta, struct rtattr *nest); + +#define RTA_TAIL(rta) \ + ((struct rtattr *) (((void *) (rta)) + \ + RTA_ALIGN((rta)->rta_len))) + +#define parse_rtattr_nested(tb, max, rta) \ + (parse_rtattr_flags((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta), \ + NLA_F_NESTED)) + +#define parse_rtattr_one_nested(type, rta) \ + (parse_rtattr_one(type, RTA_DATA(rta), RTA_PAYLOAD(rta))) + +#define parse_rtattr_nested_compat(tb, max, rta, data, len) \ + ({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL; \ + __parse_rtattr_nested_compat(tb, max, rta, len); }) + +static inline __u8 rta_getattr_u8(const struct rtattr *rta) +{ + return *(__u8 *)RTA_DATA(rta); +} +static inline __u16 rta_getattr_u16(const struct rtattr *rta) +{ + return *(__u16 *)RTA_DATA(rta); +} +static inline __be16 rta_getattr_be16(const struct rtattr *rta) +{ + return ntohs(rta_getattr_u16(rta)); +} +static inline __u32 rta_getattr_u32(const struct rtattr *rta) +{ + return *(__u32 *)RTA_DATA(rta); +} +static inline __be32 rta_getattr_be32(const struct rtattr *rta) +{ + return ntohl(rta_getattr_u32(rta)); +} +static inline __u64 rta_getattr_u64(const struct rtattr *rta) +{ + __u64 tmp; + + memcpy(&tmp, RTA_DATA(rta), sizeof(__u64)); + return tmp; +} +static inline __s32 rta_getattr_s32(const struct rtattr *rta) +{ + return *(__s32 *)RTA_DATA(rta); +} +static inline __s64 rta_getattr_s64(const struct rtattr *rta) +{ + __s64 tmp; + + memcpy(&tmp, RTA_DATA(rta), sizeof(tmp)); + return tmp; +} +static inline const char *rta_getattr_str(const struct rtattr *rta) +{ + return (const char *)RTA_DATA(rta); +} + +int rtnl_listen_all_nsid(struct rtnl_handle *); +int rtnl_listen(struct rtnl_handle *, rtnl_listen_filter_t handler, + void *jarg); +int rtnl_from_file(FILE *, rtnl_listen_filter_t handler, + void *jarg); + +#define NLMSG_TAIL(nmsg) \ + ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len))) + +#ifndef IFA_RTA +#define IFA_RTA(r) \ + ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg)))) +#endif +#ifndef IFA_PAYLOAD +#define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg)) +#endif + +#ifndef IFLA_RTA +#define IFLA_RTA(r) \ + ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg)))) +#endif +#ifndef IFLA_PAYLOAD +#define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg)) +#endif + +#ifndef NDA_RTA +#define NDA_RTA(r) \ + ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg)))) +#endif +#ifndef NDA_PAYLOAD +#define NDA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ndmsg)) +#endif + +#ifndef NDTA_RTA +#define NDTA_RTA(r) \ + ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg)))) +#endif +#ifndef NDTA_PAYLOAD +#define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ndtmsg)) +#endif + +#ifndef NETNS_RTA +#define NETNS_RTA(r) \ + ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg)))) +#endif +#ifndef NETNS_PAYLOAD +#define NETNS_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct rtgenmsg)) +#endif + +#ifndef IFLA_STATS_RTA +#define IFLA_STATS_RTA(r) \ + ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct if_stats_msg)))) +#endif + +#ifndef BRVLAN_RTA +#define BRVLAN_RTA(r) \ + ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct br_vlan_msg)))) +#endif + +#ifndef TUNNEL_RTA +#define TUNNEL_RTA(r) \ + ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct tunnel_msg)))) +#endif + +/* User defined nlmsg_type which is used mostly for logging netlink + * messages from dump file */ +#define NLMSG_TSTAMP 15 + +#define rtattr_for_each_nested(attr, nest) \ + for ((attr) = (void *)RTA_DATA(nest); \ + RTA_OK(attr, RTA_PAYLOAD(nest) - ((char *)(attr) - (char *)RTA_DATA((nest)))); \ + (attr) = RTA_TAIL((attr))) + +void nl_print_policy(const struct rtattr *attr, FILE *fp); + +#endif /* __LIBNETLINK_H__ */ |