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/*
* ndisc-linux.c
*
* Copyright (c) 2000 Dug Song <dugsong@monkey.org>
*
*/
#include "config.h"
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <asm/types.h>
#include <netinet/in.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <net/route.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "dumbnet.h"
struct ndisc_handle
{
int nlfd;
int seq;
};
ndisc_t *
ndisc_open(void)
{
struct sockaddr_nl snl;
ndisc_t *n;
if ((n = calloc(1, sizeof(*n))) != NULL) {
n->nlfd = -1;
if ((n->nlfd = socket(AF_NETLINK, SOCK_RAW,
NETLINK_ROUTE)) < 0)
return (ndisc_close(n));
memset(&snl, 0, sizeof(snl));
snl.nl_family = AF_NETLINK;
if (bind(n->nlfd, (struct sockaddr *)&snl, sizeof(snl)) < 0)
return (ndisc_close(n));
}
return (n);
}
static int
netlink_addattr(struct nlmsghdr *n, int type, const void *data, int data_len)
{
int len = RTA_LENGTH(data_len);
struct rtattr *rta;
rta = (struct rtattr *)((uint8_t*)n + NLMSG_ALIGN(n->nlmsg_len));
rta->rta_type = type;
rta->rta_len = len;
memcpy(RTA_DATA(rta), data, data_len);
n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len);
return 0;
}
int
ndisc_modify(ndisc_t *n, const struct ndisc_entry *entry, int type, int flags)
{
struct nlmsghdr *nmsg;
struct ndmsg *ndm;
struct rtattr *rta;
struct sockaddr_nl snl;
struct iovec iov;
struct msghdr msg;
u_char buf[512];
int i, af, alen;
switch (entry->ndisc_pa.addr_type) {
case ADDR_TYPE_IP:
af = AF_INET;
alen = IP_ADDR_LEN;
break;
case ADDR_TYPE_IP6:
af = AF_INET6;
alen = IP6_ADDR_LEN;
break;
default:
errno = EINVAL;
return (-1);
}
memset(buf, 0, sizeof(buf));
nmsg = (struct nlmsghdr *)buf;
nmsg->nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg));
nmsg->nlmsg_flags = NLM_F_REQUEST | flags;
nmsg->nlmsg_type = type;
nmsg->nlmsg_seq = ++n->seq;
nmsg->nlmsg_flags |= NLM_F_ACK;
ndm = (struct ndmsg *)(nmsg + 1);
ndm->ndm_family = af;
ndm->ndm_state = NUD_PERMANENT;
ndm->ndm_ifindex = entry->intf_index;
netlink_addattr(nmsg, NDA_DST, &entry->ndisc_pa.addr_data8[0],
alen);
if (type == RTM_NEWNEIGH) {
netlink_addattr(nmsg, NDA_LLADDR,
&entry->ndisc_ha.addr_data8[0], ETH_ADDR_LEN);
}
memset(&snl, 0, sizeof(snl));
snl.nl_family = AF_NETLINK;
iov.iov_base = nmsg;
iov.iov_len = nmsg->nlmsg_len;
memset(&msg, 0, sizeof(msg));
msg.msg_name = &snl;
msg.msg_namelen = sizeof(snl);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
if (sendmsg(n->nlfd, &msg, 0) < 0)
return (-1);
iov.iov_base = buf;
iov.iov_len = sizeof(buf);
if ((i = recvmsg(n->nlfd, &msg, 0)) <= 0)
return (-1);
if (nmsg->nlmsg_len < (int)sizeof(*nmsg) || nmsg->nlmsg_len > i ||
nmsg->nlmsg_seq != n->seq) {
errno = EINVAL;
return (-1);
}
if (nmsg->nlmsg_type == NLMSG_ERROR) {
struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(nmsg);
errno = -err->error;
if (errno == 0) {
return 0;
}
return (-1);
}
return (-1);
}
int
ndisc_add(ndisc_t *n, const struct ndisc_entry *entry)
{
return ndisc_modify(n, entry, RTM_NEWNEIGH, NLM_F_CREATE | NLM_F_EXCL);
}
int
ndisc_delete(ndisc_t *n, const struct ndisc_entry *entry)
{
return ndisc_modify(n, entry, RTM_DELNEIGH, 0);
}
int
ndisc_get(ndisc_t *n, struct ndisc_entry *entry)
{
/* TBD */
errno = ENOSYS;
return (-1);
}
int
nsidc_loop(ndisc_t *n, ndisc_handler callback, void *arg)
{
/* TBD */
errno = ENOSYS;
return (-1);
}
ndisc_t *
ndisc_close(ndisc_t *n)
{
if (n != NULL) {
if (n->nlfd >= 0)
close(n->nlfd);
free(n);
}
return (NULL);
}
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