72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/*
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* rta_aux.c
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* This file is part of Network-inador
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*
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* Copyright (C) 2011 - Félix Arreola Rodríguez
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*
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* Network-inador is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Network-inador is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Network-inador; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <asm/types.h>
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#include <sys/socket.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/if.h>
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#include <linux/if_addr.h>
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#include <net/ethernet.h>
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#include <net/if_arp.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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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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int rta_addattr_l (struct nlmsghdr *n, int maxlen, int type, const void *data, int alen) {
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int len = RTA_LENGTH (alen);
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struct rtattr *rta;
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if (NLMSG_ALIGN (n->nlmsg_len) + RTA_ALIGN (len) > maxlen) {
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return -1;
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}
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rta = NLMSG_TAIL (n);
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rta->rta_type = type;
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rta->rta_len = len;
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memcpy (RTA_DATA (rta), data, alen);
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n->nlmsg_len = NLMSG_ALIGN (n->nlmsg_len) + RTA_ALIGN (len);
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return 0;
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}
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struct rtattr * rta_addattr_nest (struct nlmsghdr *n, int maxlen, int type) {
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struct rtattr *nest = NLMSG_TAIL (n);
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rta_addattr_l (n, maxlen, type, NULL, 0);
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return nest;
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}
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int rta_addattr_nest_end (struct nlmsghdr *n, struct rtattr *nest) {
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nest->rta_len = (void *) NLMSG_TAIL (n) - (void *) nest;
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return n->nlmsg_len;
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}
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