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67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
#ifndef LIBNETLINK_H__
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#define LIBNETLINK_H__
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struct rtattr {
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unsigned short rta_len;
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unsigned short rta_type;
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};
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/* Macros to handle rtattributes */
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#define RTA_ALIGNTO 4
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#define RTA_ALIGN(len) (((len) + RTA_ALIGNTO - 1) & ~(RTA_ALIGNTO - 1))
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#define RTA_OK(rta, len) ((len) >= (int)sizeof(struct rtattr) && \
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(rta)->rta_len >= sizeof(struct rtattr) && \
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(rta)->rta_len <= (len))
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#define RTA_NEXT(rta, attrlen) ((attrlen) -= RTA_ALIGN((rta)->rta_len), \
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(struct rtattr *)(((char*)(rta)) + RTA_ALIGN((rta)->rta_len)))
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#define RTA_LENGTH(len) (RTA_ALIGN(sizeof(struct rtattr)) + (len))
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#define RTA_SPACE(len) RTA_ALIGN(RTA_LENGTH(len))
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#define RTA_DATA(rta) ((void *)(((char *)(rta)) + RTA_LENGTH(0)))
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#define RTA_PAYLOAD(rta) ((int)((rta)->rta_len) - RTA_LENGTH(0))
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#ifndef NLMSG_ALIGN
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# define NLMSG_ALIGN(len) (((len) + NLMSG_ALIGNTO - 1) & ~(NLMSG_ALIGNTO - 1))
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#endif
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#ifndef NLMSG_HDRLEN
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# define NLMSG_HDRLEN ((int)NLMSG_ALIGN(sizeof(struct nlmsghdr)))
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#endif
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#ifndef NLMSG_LENGTH
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# define NLMSG_LENGTH(len) ((len) + NLMSG_ALIGN(NLMSG_HDRLEN))
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#endif
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#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
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#ifndef NLMSG_DATA
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# define NLMSG_DATA(nlh) ((void *)(((char *)nlh) + NLMSG_LENGTH(0)))
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#endif
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#ifndef NLMSG_NEXT
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# define NLMSG_NEXT(nlh, len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
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(struct nlmsghdr *)(((char *)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
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#endif
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#define NLMSG_OK(nlh, len) ((len) >= (int)sizeof(struct nlmsghdr) && \
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(nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
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(nlh)->nlmsg_len <= (len))
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#define NLMSG_PAYLOAD(nlh, len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
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#define NLMSG_NOOP 0x1 /* Nothing. */
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#define NLMSG_ERROR 0x2 /* Error */
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#define NLMSG_DONE 0x3 /* End of a dump */
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#define NLMSG_OVERRUN 0x4 /* Data lost */
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#define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
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#define CR_NLMSG_SEQ 24680 /* arbitrary chosen */
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extern int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
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extern int nlmsg_receive(char *buf, int len, int (*cb)(struct nlmsghdr *));
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#endif /* LIBNETLINK_H__ */
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