static int arp_req_set(struct net *net, struct arpreq *r,
struct net_device *dev)
{
__be32 ip;
struct neighbour *neigh;
int err;
if (r->arp_flags & ATF_PUBL)
return arp_req_set_public(net, r, dev);
ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr;
if (r->arp_flags & ATF_PERM)
r->arp_flags |= ATF_COM;
if (dev == NULL) {
struct flowi fl = { .nl_u.ip4_u = { .daddr = ip,
.tos = RTO_ONLINK } };
struct rtable *rt;
err = ip_route_output_key(net, &rt, &fl);
if (err != 0)
return err;
dev = rt->dst.dev;
ip_rt_put(rt);
if (!dev)
return -EINVAL;
}
switch (dev->type) {
#if defined(CONFIG_FDDI) || defined(CONFIG_FDDI_MODULE)
case ARPHRD_FDDI:
/*
* According to RFC 1390, FDDI devices should accept ARP
* hardware types of 1 (Ethernet). However, to be more
* robust, we'll accept hardware types of either 1 (Ethernet)
* or 6 (IEEE 802.2).
*/
if (r->arp_ha.sa_family != ARPHRD_FDDI &&
r->arp_ha.sa_family != ARPHRD_ETHER &&
r->arp_ha.sa_family != ARPHRD_IEEE802)
return -EINVAL;
break;
#endif
default:
if (r->arp_ha.sa_family != dev->type)
return -EINVAL;
break;
}
neigh = __neigh_lookup_errno(&arp_tbl, &ip, dev);
err = PTR_ERR(neigh);
if (!IS_ERR(neigh)) {
unsigned state = NUD_STALE;
if (r->arp_flags & ATF_PERM)
state = NUD_PERMANENT;
err = neigh_update(neigh, (r->arp_flags & ATF_COM) ?
r->arp_ha.sa_data : NULL, state,
NEIGH_UPDATE_F_OVERRIDE |
NEIGH_UPDATE_F_ADMIN);
neigh_release(neigh);
}
return err;
}
static int
__teql_resolve(struct sk_buff *skb, struct sk_buff *skb_res, struct net_device *dev)
{
struct teql_sched_data *q = (void*)dev->qdisc->data;
struct neighbour *mn = skb->dst->neighbour;
struct neighbour *n = q->ncache;
if (mn->tbl == NULL)
return -EINVAL;
if (n && n->tbl == mn->tbl &&
memcmp(n->primary_key, mn->primary_key, mn->tbl->key_len) == 0) {
atomic_inc(&n->refcnt);
} else {
n = __neigh_lookup_errno(mn->tbl, mn->primary_key, dev);
if (IS_ERR(n))
return PTR_ERR(n);
}
if (neigh_event_send(n, skb_res) == 0) {
int err;
read_lock(&n->lock);
err = dev->hard_header(skb, dev, ntohs(skb->protocol), n->ha, NULL, skb->len);
read_unlock(&n->lock);
if (err < 0) {
neigh_release(n);
return -EINVAL;
}
teql_neigh_release(xchg(&q->ncache, n));
return 0;
}
neigh_release(n);
return (skb_res == NULL) ? -EAGAIN : 1;
}
int arp_bind_neighbour(struct dst_entry *dst)
{
struct net_device *dev = dst->dev;
struct neighbour *n = dst->neighbour;
if (dev == NULL)
return -EINVAL;
if (n == NULL) {
__be32 nexthop = ((struct rtable *)dst)->rt_gateway;
if (dev->flags&(IFF_LOOPBACK|IFF_POINTOPOINT))
nexthop = 0;
/* add by Zebos 2015-06-01*/
else if (nexthop == 0)
return -EINVAL;
n = __neigh_lookup_errno(
#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE)
dev->type == ARPHRD_ATM ? clip_tbl_hook :
#endif
&arp_tbl, &nexthop, dev);
if (IS_ERR(n))
return PTR_ERR(n);
dst->neighbour = n;
}
return 0;
}
static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res)
{
struct dn_fib_info *fi = res->fi;
struct net_device *dev = rt->u.dst.dev;
struct neighbour *n;
unsigned mss;
if (fi) {
if (DN_FIB_RES_GW(*res) &&
DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
rt->rt_gateway = DN_FIB_RES_GW(*res);
memcpy(rt->u.dst.metrics, fi->fib_metrics,
sizeof(rt->u.dst.metrics));
}
rt->rt_type = res->type;
if (dev != NULL && rt->u.dst.neighbour == NULL) {
n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev);
if (IS_ERR(n))
return PTR_ERR(n);
rt->u.dst.neighbour = n;
}
if (rt->u.dst.metrics[RTAX_MTU-1] == 0 ||
rt->u.dst.metrics[RTAX_MTU-1] > rt->u.dst.dev->mtu)
rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu;
mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->u.dst));
if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0 ||
rt->u.dst.metrics[RTAX_ADVMSS-1] > mss)
rt->u.dst.metrics[RTAX_ADVMSS-1] = mss;
return 0;
}
int arp_req_set(struct arpreq *r, struct net_device * dev)
{
u32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr;
struct neighbour *neigh;
int err;
if (r->arp_flags&ATF_PUBL) {
u32 mask = ((struct sockaddr_in *) &r->arp_netmask)->sin_addr.s_addr;
if (mask && mask != 0xFFFFFFFF)
return -EINVAL;
if (!dev && (r->arp_flags & ATF_COM)) {
dev = dev_getbyhwaddr(r->arp_ha.sa_family, r->arp_ha.sa_data);
if (!dev)
return -ENODEV;
}
if (mask) {
if (pneigh_lookup(&arp_tbl, &ip, dev, 1) == NULL)
return -ENOBUFS;
return 0;
}
if (dev == NULL) {
ipv4_devconf.proxy_arp = 1;
return 0;
}
if (__in_dev_get(dev)) {
__in_dev_get(dev)->cnf.proxy_arp = 1;
return 0;
}
return -ENXIO;
}
if (r->arp_flags & ATF_PERM)
r->arp_flags |= ATF_COM;
if (dev == NULL) {
struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip,
.tos = RTO_ONLINK } } };
struct rtable * rt;
if ((err = ip_route_output_key(&rt, &fl)) != 0)
return err;
dev = rt->u.dst.dev;
ip_rt_put(rt);
if (!dev)
return -EINVAL;
}
if (r->arp_ha.sa_family != dev->type)
return -EINVAL;
neigh = __neigh_lookup_errno(&arp_tbl, &ip, dev);
err = PTR_ERR(neigh);
if (!IS_ERR(neigh)) {
unsigned state = NUD_STALE;
if (r->arp_flags & ATF_PERM)
state = NUD_PERMANENT;
err = neigh_update(neigh, (r->arp_flags&ATF_COM) ?
r->arp_ha.sa_data : NULL, state, 1, 0);
neigh_release(neigh);
}
return err;
}
static int arp_req_set(struct net *net, struct arpreq *r,
struct net_device *dev)
{
__be32 ip;
struct neighbour *neigh;
int err;
if (r->arp_flags & ATF_PUBL)
return arp_req_set_public(net, r, dev);
ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr;
if (r->arp_flags & ATF_PERM)
r->arp_flags |= ATF_COM;
if (dev == NULL) {
struct rtable *rt = ip_route_output(net, ip, 0, RTO_ONLINK, 0);
if (IS_ERR(rt))
return PTR_ERR(rt);
dev = rt->dst.dev;
ip_rt_put(rt);
if (!dev)
return -EINVAL;
}
switch (dev->type) {
#if IS_ENABLED(CONFIG_FDDI)
case ARPHRD_FDDI:
if (r->arp_ha.sa_family != ARPHRD_FDDI &&
r->arp_ha.sa_family != ARPHRD_ETHER &&
r->arp_ha.sa_family != ARPHRD_IEEE802)
return -EINVAL;
break;
#endif
default:
if (r->arp_ha.sa_family != dev->type)
return -EINVAL;
break;
}
neigh = __neigh_lookup_errno(&arp_tbl, &ip, dev);
err = PTR_ERR(neigh);
if (!IS_ERR(neigh)) {
unsigned state = NUD_STALE;
if (r->arp_flags & ATF_PERM)
state = NUD_PERMANENT;
err = neigh_update(neigh, (r->arp_flags & ATF_COM) ?
r->arp_ha.sa_data : NULL, state,
NEIGH_UPDATE_F_OVERRIDE |
NEIGH_UPDATE_F_ADMIN);
neigh_release(neigh);
}
return err;
}
struct neighbour *__arp_bind_neighbour(struct dst_entry *dst, __be32 nexthop)
{
struct net_device *dev = dst->dev;
if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
nexthop = 0;
return __neigh_lookup_errno(
#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE)
dev->type == ARPHRD_ATM ?
clip_tbl_hook :
#endif
&arp_tbl, &nexthop, dev);
}
static int mplsbr_nexthop_resolve(struct neighbour **np,
struct sockaddr *sock_addr, struct net_device *dev)
{
struct neighbour *n;
u32 index = dev->ifindex;
n = __neigh_lookup_errno(&dumb_tbl, &index, dev);
if (IS_ERR(n))
return PTR_ERR(n);
*np = n;
return 0;
}
static int
__teql_resolve(struct sk_buff *skb, struct sk_buff *skb_res,
struct net_device *dev, struct netdev_queue *txq,
struct neighbour *mn)
{
struct teql_sched_data *q = qdisc_priv(txq->qdisc);
struct neighbour *n = q->ncache;
if (mn->tbl == NULL)
return -EINVAL;
if (n && n->tbl == mn->tbl &&
memcmp(n->primary_key, mn->primary_key, mn->tbl->key_len) == 0) {
atomic_inc(&n->refcnt);
} else {
n = __neigh_lookup_errno(mn->tbl, mn->primary_key, dev);
if (IS_ERR(n))
return PTR_ERR(n);
}
if (neigh_event_send(n, skb_res) == 0) {
int err;
char haddr[MAX_ADDR_LEN];
neigh_ha_snapshot(haddr, n, dev);
err = dev_hard_header(skb, dev, ntohs(skb->protocol), haddr,
NULL, skb->len);
if (err < 0) {
neigh_release(n);
return -EINVAL;
}
teql_neigh_release(xchg(&q->ncache, n));
return 0;
}
neigh_release(n);
return (skb_res == NULL) ? -EAGAIN : 1;
}
int ip6_route_add(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh)
{
int err;
struct rtmsg *r;
struct rt6_info *rt;
struct net_device *dev = NULL;
int addr_type;
if (rtmsg->rtmsg_dst_len > 128 || rtmsg->rtmsg_src_len > 128)
return -EINVAL;
#ifndef CONFIG_IPV6_SUBTREES
if (rtmsg->rtmsg_src_len)
return -EINVAL;
#endif
if (rtmsg->rtmsg_metric == 0)
rtmsg->rtmsg_metric = IP6_RT_PRIO_USER;
rt = dst_alloc(&ip6_dst_ops);
if (rt == NULL)
return -ENOMEM;
rt->u.dst.obsolete = -1;
rt->rt6i_expires = rtmsg->rtmsg_info;
if (nlh && (r = NLMSG_DATA(nlh))) {
rt->rt6i_protocol = r->rtm_protocol;
} else {
rt->rt6i_protocol = RTPROT_BOOT;
}
addr_type = ipv6_addr_type(&rtmsg->rtmsg_dst);
if (addr_type & IPV6_ADDR_MULTICAST)
rt->u.dst.input = ip6_mc_input;
else
rt->u.dst.input = ip6_forward;
rt->u.dst.output = ip6_output;
if (rtmsg->rtmsg_ifindex) {
dev = dev_get_by_index(rtmsg->rtmsg_ifindex);
err = -ENODEV;
if (dev == NULL)
goto out;
}
ipv6_addr_prefix(&rt->rt6i_dst.addr,
&rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len);
rt->rt6i_dst.plen = rtmsg->rtmsg_dst_len;
if (rt->rt6i_dst.plen == 128)
rt->u.dst.flags = DST_HOST;
#ifdef CONFIG_IPV6_SUBTREES
ipv6_addr_prefix(&rt->rt6i_src.addr,
&rtmsg->rtmsg_src, rtmsg->rtmsg_src_len);
rt->rt6i_src.plen = rtmsg->rtmsg_src_len;
#endif
rt->rt6i_metric = rtmsg->rtmsg_metric;
/* We cannot add true routes via loopback here,
they would result in kernel looping; promote them to reject routes
*/
if ((rtmsg->rtmsg_flags&RTF_REJECT) ||
(dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
if (dev)
dev_put(dev);
dev = &loopback_dev;
dev_hold(dev);
rt->u.dst.output = ip6_pkt_discard;
rt->u.dst.input = ip6_pkt_discard;
rt->u.dst.error = -ENETUNREACH;
rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
goto install_route;
}
if (rtmsg->rtmsg_flags & RTF_GATEWAY) {
struct in6_addr *gw_addr;
int gwa_type;
gw_addr = &rtmsg->rtmsg_gateway;
ipv6_addr_copy(&rt->rt6i_gateway, &rtmsg->rtmsg_gateway);
gwa_type = ipv6_addr_type(gw_addr);
if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
struct rt6_info *grt;
/* IPv6 strictly inhibits using not link-local
addresses as nexthop address.
Otherwise, router will not able to send redirects.
It is very good, but in some (rare!) curcumstances
(SIT, PtP, NBMA NOARP links) it is handy to allow
some exceptions. --ANK
*/
err = -EINVAL;
if (!(gwa_type&IPV6_ADDR_UNICAST))
goto out;
grt = rt6_lookup(gw_addr, NULL, rtmsg->rtmsg_ifindex, 1);
err = -EHOSTUNREACH;
if (grt == NULL)
goto out;
if (dev) {
if (dev != grt->rt6i_dev) {
dst_release(&grt->u.dst);
goto out;
}
} else {
dev = grt->rt6i_dev;
dev_hold(dev);
}
if (!(grt->rt6i_flags&RTF_GATEWAY))
err = 0;
dst_release(&grt->u.dst);
if (err)
goto out;
}
err = -EINVAL;
if (dev == NULL || (dev->flags&IFF_LOOPBACK))
goto out;
}
err = -ENODEV;
if (dev == NULL)
goto out;
if (rtmsg->rtmsg_flags & (RTF_GATEWAY|RTF_NONEXTHOP)) {
rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
if (IS_ERR(rt->rt6i_nexthop)) {
err = PTR_ERR(rt->rt6i_nexthop);
rt->rt6i_nexthop = NULL;
goto out;
}
}
if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr))
rt->rt6i_hoplimit = IPV6_DEFAULT_MCASTHOPS;
else
rt->rt6i_hoplimit = ipv6_get_hoplimit(dev);
rt->rt6i_flags = rtmsg->rtmsg_flags;
install_route:
rt->u.dst.pmtu = ipv6_get_mtu(dev);
rt->u.dst.advmss = max_t(unsigned int, rt->u.dst.pmtu - 60, ip6_rt_min_advmss);
/* Maximal non-jumbo IPv6 payload is 65535 and corresponding
MSS is 65535 - tcp_header_size. 65535 is also valid and
means: "any MSS, rely only on pmtu discovery"
*/
if (rt->u.dst.advmss > 65535-20)
rt->u.dst.advmss = 65535;
rt->u.dst.dev = dev;
return rt6_ins(rt, nlh);
out:
if (dev)
dev_put(dev);
dst_free((struct dst_entry *) rt);
return err;
}
static int arp_req_set(struct arpreq *r, struct net_device * dev)
{
u32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr;
struct neighbour *neigh;
int err;
if (r->arp_flags&ATF_PUBL) {
u32 mask = ((struct sockaddr_in *) &r->arp_netmask)->sin_addr.s_addr;
if (mask && mask != 0xFFFFFFFF)
return -EINVAL;
if (!dev && (r->arp_flags & ATF_COM)) {
dev = dev_getbyhwaddr(r->arp_ha.sa_family, r->arp_ha.sa_data);
if (!dev)
return -ENODEV;
}
if (mask) {
if (pneigh_lookup(&arp_tbl, &ip, dev, 1) == NULL)
return -ENOBUFS;
return 0;
}
if (dev == NULL) {
ipv4_devconf.proxy_arp = 1;
return 0;
}
if (__in_dev_get_rtnl(dev)) {
__in_dev_get_rtnl(dev)->cnf.proxy_arp = 1;
return 0;
}
return -ENXIO;
}
if (r->arp_flags & ATF_PERM)
r->arp_flags |= ATF_COM;
if (dev == NULL) {
struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip,
.tos = RTO_ONLINK } } };
struct rtable * rt;
if ((err = ip_route_output_key(&rt, &fl)) != 0)
return err;
dev = rt->u.dst.dev;
ip_rt_put(rt);
if (!dev)
return -EINVAL;
}
switch (dev->type) {
#ifdef CONFIG_FDDI
case ARPHRD_FDDI:
/*
* According to RFC 1390, FDDI devices should accept ARP
* hardware types of 1 (Ethernet). However, to be more
* robust, we'll accept hardware types of either 1 (Ethernet)
* or 6 (IEEE 802.2).
*/
if (r->arp_ha.sa_family != ARPHRD_FDDI &&
r->arp_ha.sa_family != ARPHRD_ETHER &&
r->arp_ha.sa_family != ARPHRD_IEEE802)
return -EINVAL;
break;
#endif
default:
if (r->arp_ha.sa_family != dev->type)
return -EINVAL;
break;
}
neigh = __neigh_lookup_errno(&arp_tbl, &ip, dev);
err = PTR_ERR(neigh);
if (!IS_ERR(neigh)) {
unsigned state = NUD_STALE;
if (r->arp_flags & ATF_PERM)
state = NUD_PERMANENT;
err = neigh_update(neigh, (r->arp_flags&ATF_COM) ?
r->arp_ha.sa_data : NULL, state,
NEIGH_UPDATE_F_OVERRIDE|
NEIGH_UPDATE_F_ADMIN);
neigh_release(neigh);
}
return err;
}
