cce93139d0
DHCP-assigned IP, broadcast, and subnet. The nl_foreach_nlmsg() gains a seq parameter that when set to non-0 will cause nl_foreach_nlmsg() to ignore any nlmsg that has a seq number that does not match the caller-supplied seq argument.
101 lines
3.5 KiB
C
101 lines
3.5 KiB
C
/* nl.h - low level netlink protocol functions
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*
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* Copyright (c) 2011-2014 Nicholas J. Kain <njkain at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef NK_NL_H_
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#define NK_NL_H_
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// Limited netlink code. The horrors...
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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static inline int nl_attr_ok(const struct nlattr *attr, size_t len)
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{
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if (len < sizeof *attr)
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return 0;
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if (attr->nla_len < sizeof *attr)
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return 0;
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if (attr->nla_len > len)
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return 0;
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return 1;
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}
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static inline int rtattr_ok(const struct rtattr *attr, size_t len)
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{
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return RTA_OK(attr, len);
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}
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static inline size_t nlattr_get_len(const struct nlattr *attr)
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{
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return attr->nla_len;
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}
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static inline void *nlattr_get_data(const struct nlattr *attr)
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{
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return (char *)attr + NLA_HDRLEN;
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}
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static inline void *rtattr_get_data(const struct rtattr *attr)
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{
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return (char *)RTA_DATA(attr);
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}
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static inline void *nlmsg_get_data(const struct nlmsghdr *nlh)
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{
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return (char *)nlh + NLMSG_HDRLEN;
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}
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static inline int nlmsg_get_error(const struct nlmsghdr *nlh)
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{
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const struct nlmsgerr *err = nlmsg_get_data(nlh);
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if (nlh->nlmsg_len < sizeof(struct nlmsgerr) + NLMSG_HDRLEN)
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return EBADMSG;
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return err->error & 0x7fffffff;
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}
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extern int nl_add_rtattr(struct nlmsghdr *n, size_t max_length, int type,
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const void *data, size_t data_length);
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typedef int (*nl_attr_parse_fn)(struct nlattr *attr, int type, void *data);
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extern void nl_attr_parse(const struct nlmsghdr *nlh, size_t offset,
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nl_attr_parse_fn workfn, void *data);
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typedef int (*nl_rtattr_parse_fn)(struct rtattr *attr, int type, void *data);
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extern void nl_rtattr_parse(const struct nlmsghdr *nlh, size_t offset,
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nl_rtattr_parse_fn workfn, void *data);
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extern ssize_t nl_recv_buf(int fd, char *buf, size_t blen);
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typedef void (*nlmsg_foreach_fn)(const struct nlmsghdr *, void *);
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extern int nl_foreach_nlmsg(char *buf, size_t blen, uint32_t seq,
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uint32_t portid,
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nlmsg_foreach_fn pfn, void *fnarg);
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extern int nl_sendgetlink(int fd, int seq);
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extern int nl_sendgetaddr(int fd, int seq, int ifindex);
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extern int nl_open(int nltype, int nlgroup, int *nlportid);
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#endif /* NK_NL_H_ */
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