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https://git.proxmox.com/git/mirror_iproute2
synced 2025-10-05 03:59:55 +00:00
86bf43c7c2
This is an update for 460c03f3f3 ("iplink: double the buffer size also in
iplink_get()"). After update, we will not need to double the buffer size
every time when VFs number increased.
With call like rtnl_talk(&rth, &req.n, NULL, 0), we can simply remove the
length parameter.
With call like rtnl_talk(&rth, nlh, nlh, sizeof(req), I add a new variable
answer to avoid overwrite data in nlh, because it may has more info after
nlh. also this will avoid nlh buffer not enough issue.
We need to free answer after using.
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: Phil Sutter <phil@nwl.cc>
247 lines
7.8 KiB
C
247 lines
7.8 KiB
C
#ifndef __LIBNETLINK_H__
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#define __LIBNETLINK_H__ 1
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#include <stdio.h>
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#include <string.h>
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#include <asm/types.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/if_link.h>
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#include <linux/if_addr.h>
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#include <linux/neighbour.h>
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#include <linux/netconf.h>
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#include <arpa/inet.h>
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struct rtnl_handle {
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int fd;
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struct sockaddr_nl local;
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struct sockaddr_nl peer;
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__u32 seq;
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__u32 dump;
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int proto;
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FILE *dump_fp;
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#define RTNL_HANDLE_F_LISTEN_ALL_NSID 0x01
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#define RTNL_HANDLE_F_SUPPRESS_NLERR 0x02
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int flags;
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};
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struct nlmsg_list {
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struct nlmsg_list *next;
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struct nlmsghdr h;
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};
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struct nlmsg_chain {
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struct nlmsg_list *head;
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struct nlmsg_list *tail;
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};
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extern int rcvbuf;
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int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions)
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__attribute__((warn_unused_result));
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int rtnl_open_byproto(struct rtnl_handle *rth, unsigned int subscriptions,
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int protocol)
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__attribute__((warn_unused_result));
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void rtnl_close(struct rtnl_handle *rth);
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int rtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type)
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__attribute__((warn_unused_result));
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int rtnl_wilddump_req_filter(struct rtnl_handle *rth, int fam, int type,
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__u32 filt_mask)
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__attribute__((warn_unused_result));
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typedef int (*req_filter_fn_t)(struct nlmsghdr *nlh, int reqlen);
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int rtnl_wilddump_req_filter_fn(struct rtnl_handle *rth, int fam, int type,
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req_filter_fn_t fn)
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__attribute__((warn_unused_result));
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int rtnl_wilddump_stats_req_filter(struct rtnl_handle *rth, int fam, int type,
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__u32 filt_mask)
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__attribute__((warn_unused_result));
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int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
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int len)
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__attribute__((warn_unused_result));
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int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n)
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__attribute__((warn_unused_result));
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struct rtnl_ctrl_data {
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int nsid;
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};
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typedef int (*rtnl_filter_t)(const struct sockaddr_nl *,
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struct nlmsghdr *n, void *);
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typedef int (*rtnl_listen_filter_t)(const struct sockaddr_nl *,
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struct rtnl_ctrl_data *,
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struct nlmsghdr *n, void *);
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typedef int (*nl_ext_ack_fn_t)(const char *errmsg, uint32_t off,
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const struct nlmsghdr *inner_nlh);
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struct rtnl_dump_filter_arg {
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rtnl_filter_t filter;
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void *arg1;
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__u16 nc_flags;
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};
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int rtnl_dump_filter_l(struct rtnl_handle *rth,
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const struct rtnl_dump_filter_arg *arg);
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int rtnl_dump_filter_nc(struct rtnl_handle *rth,
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rtnl_filter_t filter,
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void *arg, __u16 nc_flags);
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#define rtnl_dump_filter(rth, filter, arg) \
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rtnl_dump_filter_nc(rth, filter, arg, 0)
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int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
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struct nlmsghdr **answer)
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__attribute__((warn_unused_result));
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int rtnl_talk_extack(struct rtnl_handle *rtnl, struct nlmsghdr *n,
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struct nlmsghdr **answer, nl_ext_ack_fn_t errfn)
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__attribute__((warn_unused_result));
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int rtnl_talk_suppress_rtnl_errmsg(struct rtnl_handle *rtnl, struct nlmsghdr *n,
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struct nlmsghdr **answer)
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__attribute__((warn_unused_result));
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int rtnl_send(struct rtnl_handle *rth, const void *buf, int)
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__attribute__((warn_unused_result));
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int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int)
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__attribute__((warn_unused_result));
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int addattr(struct nlmsghdr *n, int maxlen, int type);
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int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
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int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
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int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
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int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
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int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
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int addattr_l(struct nlmsghdr *n, int maxlen, int type,
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const void *data, int alen);
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int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
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struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
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int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
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struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type,
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const void *data, int len);
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int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
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int rta_addattr8(struct rtattr *rta, int maxlen, int type, __u8 data);
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int rta_addattr16(struct rtattr *rta, int maxlen, int type, __u16 data);
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int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
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int rta_addattr64(struct rtattr *rta, int maxlen, int type, __u64 data);
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int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
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const void *data, int alen);
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int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
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int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta,
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int len, unsigned short flags);
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int parse_rtattr_byindex(struct rtattr *tb[], int max,
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struct rtattr *rta, int len);
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struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len);
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int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, int len);
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struct rtattr *rta_nest(struct rtattr *rta, int maxlen, int type);
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int rta_nest_end(struct rtattr *rta, struct rtattr *nest);
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#define RTA_TAIL(rta) \
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((struct rtattr *) (((void *) (rta)) + \
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RTA_ALIGN((rta)->rta_len)))
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#define parse_rtattr_nested(tb, max, rta) \
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(parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
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#define parse_rtattr_one_nested(type, rta) \
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(parse_rtattr_one(type, RTA_DATA(rta), RTA_PAYLOAD(rta)))
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#define parse_rtattr_nested_compat(tb, max, rta, data, len) \
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({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL; \
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__parse_rtattr_nested_compat(tb, max, rta, len); })
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static inline __u8 rta_getattr_u8(const struct rtattr *rta)
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{
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return *(__u8 *)RTA_DATA(rta);
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}
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static inline __u16 rta_getattr_u16(const struct rtattr *rta)
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{
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return *(__u16 *)RTA_DATA(rta);
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}
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static inline __be16 rta_getattr_be16(const struct rtattr *rta)
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{
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return ntohs(rta_getattr_u16(rta));
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}
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static inline __u32 rta_getattr_u32(const struct rtattr *rta)
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{
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return *(__u32 *)RTA_DATA(rta);
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}
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static inline __be32 rta_getattr_be32(const struct rtattr *rta)
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{
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return ntohl(rta_getattr_u32(rta));
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}
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static inline __u64 rta_getattr_u64(const struct rtattr *rta)
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{
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__u64 tmp;
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memcpy(&tmp, RTA_DATA(rta), sizeof(__u64));
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return tmp;
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}
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static inline const char *rta_getattr_str(const struct rtattr *rta)
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{
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return (const char *)RTA_DATA(rta);
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}
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int rtnl_listen_all_nsid(struct rtnl_handle *);
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int rtnl_listen(struct rtnl_handle *, rtnl_listen_filter_t handler,
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void *jarg);
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int rtnl_from_file(FILE *, rtnl_listen_filter_t handler,
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void *jarg);
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#define NLMSG_TAIL(nmsg) \
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((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
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#ifndef IFA_RTA
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#define IFA_RTA(r) \
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((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
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#endif
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#ifndef IFA_PAYLOAD
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#define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg))
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#endif
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#ifndef IFLA_RTA
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#define IFLA_RTA(r) \
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((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
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#endif
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#ifndef IFLA_PAYLOAD
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#define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg))
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#endif
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#ifndef NDA_RTA
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#define NDA_RTA(r) \
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((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
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#endif
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#ifndef NDA_PAYLOAD
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#define NDA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ndmsg))
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#endif
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#ifndef NDTA_RTA
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#define NDTA_RTA(r) \
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((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
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#endif
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#ifndef NDTA_PAYLOAD
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#define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ndtmsg))
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#endif
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#ifndef NETNS_RTA
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#define NETNS_RTA(r) \
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((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))))
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#endif
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#ifndef NETNS_PAYLOAD
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#define NETNS_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct rtgenmsg))
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#endif
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#ifndef IFLA_STATS_RTA
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#define IFLA_STATS_RTA(r) \
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((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct if_stats_msg))))
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#endif
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/* User defined nlmsg_type which is used mostly for logging netlink
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* messages from dump file */
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#define NLMSG_TSTAMP 15
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#endif /* __LIBNETLINK_H__ */
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