mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 10:04:12 +08:00
46d5e62dd3
xdp_return_frame_bulk() needs to pass a xdp_buff to __xdp_return(). strlcpy got converted to strscpy but here it makes no functional difference, so just keep the right code. Conflicts: net/netfilter/nf_tables_api.c Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2055 lines
46 KiB
C
2055 lines
46 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* vrf.c: device driver to encapsulate a VRF space
|
|
*
|
|
* Copyright (c) 2015 Cumulus Networks. All rights reserved.
|
|
* Copyright (c) 2015 Shrijeet Mukherjee <shm@cumulusnetworks.com>
|
|
* Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
|
|
*
|
|
* Based on dummy, team and ipvlan drivers
|
|
*/
|
|
|
|
#include <linux/ethtool.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/ip.h>
|
|
#include <linux/init.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/netfilter.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <net/rtnetlink.h>
|
|
#include <linux/u64_stats_sync.h>
|
|
#include <linux/hashtable.h>
|
|
#include <linux/spinlock_types.h>
|
|
|
|
#include <linux/inetdevice.h>
|
|
#include <net/arp.h>
|
|
#include <net/ip.h>
|
|
#include <net/ip_fib.h>
|
|
#include <net/ip6_fib.h>
|
|
#include <net/ip6_route.h>
|
|
#include <net/route.h>
|
|
#include <net/addrconf.h>
|
|
#include <net/l3mdev.h>
|
|
#include <net/fib_rules.h>
|
|
#include <net/netns/generic.h>
|
|
|
|
#define DRV_NAME "vrf"
|
|
#define DRV_VERSION "1.1"
|
|
|
|
#define FIB_RULE_PREF 1000 /* default preference for FIB rules */
|
|
|
|
#define HT_MAP_BITS 4
|
|
#define HASH_INITVAL ((u32)0xcafef00d)
|
|
|
|
struct vrf_map {
|
|
DECLARE_HASHTABLE(ht, HT_MAP_BITS);
|
|
spinlock_t vmap_lock;
|
|
|
|
/* shared_tables:
|
|
* count how many distinct tables do not comply with the strict mode
|
|
* requirement.
|
|
* shared_tables value must be 0 in order to enable the strict mode.
|
|
*
|
|
* example of the evolution of shared_tables:
|
|
* | time
|
|
* add vrf0 --> table 100 shared_tables = 0 | t0
|
|
* add vrf1 --> table 101 shared_tables = 0 | t1
|
|
* add vrf2 --> table 100 shared_tables = 1 | t2
|
|
* add vrf3 --> table 100 shared_tables = 1 | t3
|
|
* add vrf4 --> table 101 shared_tables = 2 v t4
|
|
*
|
|
* shared_tables is a "step function" (or "staircase function")
|
|
* and it is increased by one when the second vrf is associated to a
|
|
* table.
|
|
*
|
|
* at t2, vrf0 and vrf2 are bound to table 100: shared_tables = 1.
|
|
*
|
|
* at t3, another dev (vrf3) is bound to the same table 100 but the
|
|
* value of shared_tables is still 1.
|
|
* This means that no matter how many new vrfs will register on the
|
|
* table 100, the shared_tables will not increase (considering only
|
|
* table 100).
|
|
*
|
|
* at t4, vrf4 is bound to table 101, and shared_tables = 2.
|
|
*
|
|
* Looking at the value of shared_tables we can immediately know if
|
|
* the strict_mode can or cannot be enforced. Indeed, strict_mode
|
|
* can be enforced iff shared_tables = 0.
|
|
*
|
|
* Conversely, shared_tables is decreased when a vrf is de-associated
|
|
* from a table with exactly two associated vrfs.
|
|
*/
|
|
u32 shared_tables;
|
|
|
|
bool strict_mode;
|
|
};
|
|
|
|
struct vrf_map_elem {
|
|
struct hlist_node hnode;
|
|
struct list_head vrf_list; /* VRFs registered to this table */
|
|
|
|
u32 table_id;
|
|
int users;
|
|
int ifindex;
|
|
};
|
|
|
|
static unsigned int vrf_net_id;
|
|
|
|
/* per netns vrf data */
|
|
struct netns_vrf {
|
|
/* protected by rtnl lock */
|
|
bool add_fib_rules;
|
|
|
|
struct vrf_map vmap;
|
|
struct ctl_table_header *ctl_hdr;
|
|
};
|
|
|
|
struct net_vrf {
|
|
struct rtable __rcu *rth;
|
|
struct rt6_info __rcu *rt6;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
struct fib6_table *fib6_table;
|
|
#endif
|
|
u32 tb_id;
|
|
|
|
struct list_head me_list; /* entry in vrf_map_elem */
|
|
int ifindex;
|
|
};
|
|
|
|
struct pcpu_dstats {
|
|
u64 tx_pkts;
|
|
u64 tx_bytes;
|
|
u64 tx_drps;
|
|
u64 rx_pkts;
|
|
u64 rx_bytes;
|
|
u64 rx_drps;
|
|
struct u64_stats_sync syncp;
|
|
};
|
|
|
|
static void vrf_rx_stats(struct net_device *dev, int len)
|
|
{
|
|
struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
|
|
|
|
u64_stats_update_begin(&dstats->syncp);
|
|
dstats->rx_pkts++;
|
|
dstats->rx_bytes += len;
|
|
u64_stats_update_end(&dstats->syncp);
|
|
}
|
|
|
|
static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb)
|
|
{
|
|
vrf_dev->stats.tx_errors++;
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
static void vrf_get_stats64(struct net_device *dev,
|
|
struct rtnl_link_stats64 *stats)
|
|
{
|
|
int i;
|
|
|
|
for_each_possible_cpu(i) {
|
|
const struct pcpu_dstats *dstats;
|
|
u64 tbytes, tpkts, tdrops, rbytes, rpkts;
|
|
unsigned int start;
|
|
|
|
dstats = per_cpu_ptr(dev->dstats, i);
|
|
do {
|
|
start = u64_stats_fetch_begin_irq(&dstats->syncp);
|
|
tbytes = dstats->tx_bytes;
|
|
tpkts = dstats->tx_pkts;
|
|
tdrops = dstats->tx_drps;
|
|
rbytes = dstats->rx_bytes;
|
|
rpkts = dstats->rx_pkts;
|
|
} while (u64_stats_fetch_retry_irq(&dstats->syncp, start));
|
|
stats->tx_bytes += tbytes;
|
|
stats->tx_packets += tpkts;
|
|
stats->tx_dropped += tdrops;
|
|
stats->rx_bytes += rbytes;
|
|
stats->rx_packets += rpkts;
|
|
}
|
|
}
|
|
|
|
static struct vrf_map *netns_vrf_map(struct net *net)
|
|
{
|
|
struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id);
|
|
|
|
return &nn_vrf->vmap;
|
|
}
|
|
|
|
static struct vrf_map *netns_vrf_map_by_dev(struct net_device *dev)
|
|
{
|
|
return netns_vrf_map(dev_net(dev));
|
|
}
|
|
|
|
static int vrf_map_elem_get_vrf_ifindex(struct vrf_map_elem *me)
|
|
{
|
|
struct list_head *me_head = &me->vrf_list;
|
|
struct net_vrf *vrf;
|
|
|
|
if (list_empty(me_head))
|
|
return -ENODEV;
|
|
|
|
vrf = list_first_entry(me_head, struct net_vrf, me_list);
|
|
|
|
return vrf->ifindex;
|
|
}
|
|
|
|
static struct vrf_map_elem *vrf_map_elem_alloc(gfp_t flags)
|
|
{
|
|
struct vrf_map_elem *me;
|
|
|
|
me = kmalloc(sizeof(*me), flags);
|
|
if (!me)
|
|
return NULL;
|
|
|
|
return me;
|
|
}
|
|
|
|
static void vrf_map_elem_free(struct vrf_map_elem *me)
|
|
{
|
|
kfree(me);
|
|
}
|
|
|
|
static void vrf_map_elem_init(struct vrf_map_elem *me, int table_id,
|
|
int ifindex, int users)
|
|
{
|
|
me->table_id = table_id;
|
|
me->ifindex = ifindex;
|
|
me->users = users;
|
|
INIT_LIST_HEAD(&me->vrf_list);
|
|
}
|
|
|
|
static struct vrf_map_elem *vrf_map_lookup_elem(struct vrf_map *vmap,
|
|
u32 table_id)
|
|
{
|
|
struct vrf_map_elem *me;
|
|
u32 key;
|
|
|
|
key = jhash_1word(table_id, HASH_INITVAL);
|
|
hash_for_each_possible(vmap->ht, me, hnode, key) {
|
|
if (me->table_id == table_id)
|
|
return me;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void vrf_map_add_elem(struct vrf_map *vmap, struct vrf_map_elem *me)
|
|
{
|
|
u32 table_id = me->table_id;
|
|
u32 key;
|
|
|
|
key = jhash_1word(table_id, HASH_INITVAL);
|
|
hash_add(vmap->ht, &me->hnode, key);
|
|
}
|
|
|
|
static void vrf_map_del_elem(struct vrf_map_elem *me)
|
|
{
|
|
hash_del(&me->hnode);
|
|
}
|
|
|
|
static void vrf_map_lock(struct vrf_map *vmap) __acquires(&vmap->vmap_lock)
|
|
{
|
|
spin_lock(&vmap->vmap_lock);
|
|
}
|
|
|
|
static void vrf_map_unlock(struct vrf_map *vmap) __releases(&vmap->vmap_lock)
|
|
{
|
|
spin_unlock(&vmap->vmap_lock);
|
|
}
|
|
|
|
/* called with rtnl lock held */
|
|
static int
|
|
vrf_map_register_dev(struct net_device *dev, struct netlink_ext_ack *extack)
|
|
{
|
|
struct vrf_map *vmap = netns_vrf_map_by_dev(dev);
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
struct vrf_map_elem *new_me, *me;
|
|
u32 table_id = vrf->tb_id;
|
|
bool free_new_me = false;
|
|
int users;
|
|
int res;
|
|
|
|
/* we pre-allocate elements used in the spin-locked section (so that we
|
|
* keep the spinlock as short as possibile).
|
|
*/
|
|
new_me = vrf_map_elem_alloc(GFP_KERNEL);
|
|
if (!new_me)
|
|
return -ENOMEM;
|
|
|
|
vrf_map_elem_init(new_me, table_id, dev->ifindex, 0);
|
|
|
|
vrf_map_lock(vmap);
|
|
|
|
me = vrf_map_lookup_elem(vmap, table_id);
|
|
if (!me) {
|
|
me = new_me;
|
|
vrf_map_add_elem(vmap, me);
|
|
goto link_vrf;
|
|
}
|
|
|
|
/* we already have an entry in the vrf_map, so it means there is (at
|
|
* least) a vrf registered on the specific table.
|
|
*/
|
|
free_new_me = true;
|
|
if (vmap->strict_mode) {
|
|
/* vrfs cannot share the same table */
|
|
NL_SET_ERR_MSG(extack, "Table is used by another VRF");
|
|
res = -EBUSY;
|
|
goto unlock;
|
|
}
|
|
|
|
link_vrf:
|
|
users = ++me->users;
|
|
if (users == 2)
|
|
++vmap->shared_tables;
|
|
|
|
list_add(&vrf->me_list, &me->vrf_list);
|
|
|
|
res = 0;
|
|
|
|
unlock:
|
|
vrf_map_unlock(vmap);
|
|
|
|
/* clean-up, if needed */
|
|
if (free_new_me)
|
|
vrf_map_elem_free(new_me);
|
|
|
|
return res;
|
|
}
|
|
|
|
/* called with rtnl lock held */
|
|
static void vrf_map_unregister_dev(struct net_device *dev)
|
|
{
|
|
struct vrf_map *vmap = netns_vrf_map_by_dev(dev);
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
u32 table_id = vrf->tb_id;
|
|
struct vrf_map_elem *me;
|
|
int users;
|
|
|
|
vrf_map_lock(vmap);
|
|
|
|
me = vrf_map_lookup_elem(vmap, table_id);
|
|
if (!me)
|
|
goto unlock;
|
|
|
|
list_del(&vrf->me_list);
|
|
|
|
users = --me->users;
|
|
if (users == 1) {
|
|
--vmap->shared_tables;
|
|
} else if (users == 0) {
|
|
vrf_map_del_elem(me);
|
|
|
|
/* no one will refer to this element anymore */
|
|
vrf_map_elem_free(me);
|
|
}
|
|
|
|
unlock:
|
|
vrf_map_unlock(vmap);
|
|
}
|
|
|
|
/* return the vrf device index associated with the table_id */
|
|
static int vrf_ifindex_lookup_by_table_id(struct net *net, u32 table_id)
|
|
{
|
|
struct vrf_map *vmap = netns_vrf_map(net);
|
|
struct vrf_map_elem *me;
|
|
int ifindex;
|
|
|
|
vrf_map_lock(vmap);
|
|
|
|
if (!vmap->strict_mode) {
|
|
ifindex = -EPERM;
|
|
goto unlock;
|
|
}
|
|
|
|
me = vrf_map_lookup_elem(vmap, table_id);
|
|
if (!me) {
|
|
ifindex = -ENODEV;
|
|
goto unlock;
|
|
}
|
|
|
|
ifindex = vrf_map_elem_get_vrf_ifindex(me);
|
|
|
|
unlock:
|
|
vrf_map_unlock(vmap);
|
|
|
|
return ifindex;
|
|
}
|
|
|
|
/* by default VRF devices do not have a qdisc and are expected
|
|
* to be created with only a single queue.
|
|
*/
|
|
static bool qdisc_tx_is_default(const struct net_device *dev)
|
|
{
|
|
struct netdev_queue *txq;
|
|
struct Qdisc *qdisc;
|
|
|
|
if (dev->num_tx_queues > 1)
|
|
return false;
|
|
|
|
txq = netdev_get_tx_queue(dev, 0);
|
|
qdisc = rcu_access_pointer(txq->qdisc);
|
|
|
|
return !qdisc->enqueue;
|
|
}
|
|
|
|
/* Local traffic destined to local address. Reinsert the packet to rx
|
|
* path, similar to loopback handling.
|
|
*/
|
|
static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev,
|
|
struct dst_entry *dst)
|
|
{
|
|
int len = skb->len;
|
|
|
|
skb_orphan(skb);
|
|
|
|
skb_dst_set(skb, dst);
|
|
|
|
/* set pkt_type to avoid skb hitting packet taps twice -
|
|
* once on Tx and again in Rx processing
|
|
*/
|
|
skb->pkt_type = PACKET_LOOPBACK;
|
|
|
|
skb->protocol = eth_type_trans(skb, dev);
|
|
|
|
if (likely(netif_rx(skb) == NET_RX_SUCCESS))
|
|
vrf_rx_stats(dev, len);
|
|
else
|
|
this_cpu_inc(dev->dstats->rx_drps);
|
|
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static int vrf_ip6_local_out(struct net *net, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
|
|
err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net,
|
|
sk, skb, NULL, skb_dst(skb)->dev, dst_output);
|
|
|
|
if (likely(err == 1))
|
|
err = dst_output(net, sk, skb);
|
|
|
|
return err;
|
|
}
|
|
|
|
static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
|
|
struct net_device *dev)
|
|
{
|
|
const struct ipv6hdr *iph;
|
|
struct net *net = dev_net(skb->dev);
|
|
struct flowi6 fl6;
|
|
int ret = NET_XMIT_DROP;
|
|
struct dst_entry *dst;
|
|
struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst;
|
|
|
|
if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr)))
|
|
goto err;
|
|
|
|
iph = ipv6_hdr(skb);
|
|
|
|
memset(&fl6, 0, sizeof(fl6));
|
|
/* needed to match OIF rule */
|
|
fl6.flowi6_oif = dev->ifindex;
|
|
fl6.flowi6_iif = LOOPBACK_IFINDEX;
|
|
fl6.daddr = iph->daddr;
|
|
fl6.saddr = iph->saddr;
|
|
fl6.flowlabel = ip6_flowinfo(iph);
|
|
fl6.flowi6_mark = skb->mark;
|
|
fl6.flowi6_proto = iph->nexthdr;
|
|
fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF;
|
|
|
|
dst = ip6_dst_lookup_flow(net, NULL, &fl6, NULL);
|
|
if (IS_ERR(dst) || dst == dst_null)
|
|
goto err;
|
|
|
|
skb_dst_drop(skb);
|
|
|
|
/* if dst.dev is loopback or the VRF device again this is locally
|
|
* originated traffic destined to a local address. Short circuit
|
|
* to Rx path
|
|
*/
|
|
if (dst->dev == dev)
|
|
return vrf_local_xmit(skb, dev, dst);
|
|
|
|
skb_dst_set(skb, dst);
|
|
|
|
/* strip the ethernet header added for pass through VRF device */
|
|
__skb_pull(skb, skb_network_offset(skb));
|
|
|
|
ret = vrf_ip6_local_out(net, skb->sk, skb);
|
|
if (unlikely(net_xmit_eval(ret)))
|
|
dev->stats.tx_errors++;
|
|
else
|
|
ret = NET_XMIT_SUCCESS;
|
|
|
|
return ret;
|
|
err:
|
|
vrf_tx_error(dev, skb);
|
|
return NET_XMIT_DROP;
|
|
}
|
|
#else
|
|
static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb,
|
|
struct net_device *dev)
|
|
{
|
|
vrf_tx_error(dev, skb);
|
|
return NET_XMIT_DROP;
|
|
}
|
|
#endif
|
|
|
|
/* based on ip_local_out; can't use it b/c the dst is switched pointing to us */
|
|
static int vrf_ip_local_out(struct net *net, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
|
|
err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
|
|
skb, NULL, skb_dst(skb)->dev, dst_output);
|
|
if (likely(err == 1))
|
|
err = dst_output(net, sk, skb);
|
|
|
|
return err;
|
|
}
|
|
|
|
static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
|
|
struct net_device *vrf_dev)
|
|
{
|
|
struct iphdr *ip4h;
|
|
int ret = NET_XMIT_DROP;
|
|
struct flowi4 fl4;
|
|
struct net *net = dev_net(vrf_dev);
|
|
struct rtable *rt;
|
|
|
|
if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr)))
|
|
goto err;
|
|
|
|
ip4h = ip_hdr(skb);
|
|
|
|
memset(&fl4, 0, sizeof(fl4));
|
|
/* needed to match OIF rule */
|
|
fl4.flowi4_oif = vrf_dev->ifindex;
|
|
fl4.flowi4_iif = LOOPBACK_IFINDEX;
|
|
fl4.flowi4_tos = RT_TOS(ip4h->tos);
|
|
fl4.flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_SKIP_NH_OIF;
|
|
fl4.flowi4_proto = ip4h->protocol;
|
|
fl4.daddr = ip4h->daddr;
|
|
fl4.saddr = ip4h->saddr;
|
|
|
|
rt = ip_route_output_flow(net, &fl4, NULL);
|
|
if (IS_ERR(rt))
|
|
goto err;
|
|
|
|
skb_dst_drop(skb);
|
|
|
|
/* if dst.dev is loopback or the VRF device again this is locally
|
|
* originated traffic destined to a local address. Short circuit
|
|
* to Rx path
|
|
*/
|
|
if (rt->dst.dev == vrf_dev)
|
|
return vrf_local_xmit(skb, vrf_dev, &rt->dst);
|
|
|
|
skb_dst_set(skb, &rt->dst);
|
|
|
|
/* strip the ethernet header added for pass through VRF device */
|
|
__skb_pull(skb, skb_network_offset(skb));
|
|
|
|
if (!ip4h->saddr) {
|
|
ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
|
|
RT_SCOPE_LINK);
|
|
}
|
|
|
|
ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
|
|
if (unlikely(net_xmit_eval(ret)))
|
|
vrf_dev->stats.tx_errors++;
|
|
else
|
|
ret = NET_XMIT_SUCCESS;
|
|
|
|
out:
|
|
return ret;
|
|
err:
|
|
vrf_tx_error(vrf_dev, skb);
|
|
goto out;
|
|
}
|
|
|
|
static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
switch (skb->protocol) {
|
|
case htons(ETH_P_IP):
|
|
return vrf_process_v4_outbound(skb, dev);
|
|
case htons(ETH_P_IPV6):
|
|
return vrf_process_v6_outbound(skb, dev);
|
|
default:
|
|
vrf_tx_error(dev, skb);
|
|
return NET_XMIT_DROP;
|
|
}
|
|
}
|
|
|
|
static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
int len = skb->len;
|
|
netdev_tx_t ret = is_ip_tx_frame(skb, dev);
|
|
|
|
if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
|
|
struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
|
|
|
|
u64_stats_update_begin(&dstats->syncp);
|
|
dstats->tx_pkts++;
|
|
dstats->tx_bytes += len;
|
|
u64_stats_update_end(&dstats->syncp);
|
|
} else {
|
|
this_cpu_inc(dev->dstats->tx_drps);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void vrf_finish_direct(struct sk_buff *skb)
|
|
{
|
|
struct net_device *vrf_dev = skb->dev;
|
|
|
|
if (!list_empty(&vrf_dev->ptype_all) &&
|
|
likely(skb_headroom(skb) >= ETH_HLEN)) {
|
|
struct ethhdr *eth = skb_push(skb, ETH_HLEN);
|
|
|
|
ether_addr_copy(eth->h_source, vrf_dev->dev_addr);
|
|
eth_zero_addr(eth->h_dest);
|
|
eth->h_proto = skb->protocol;
|
|
|
|
rcu_read_lock_bh();
|
|
dev_queue_xmit_nit(skb, vrf_dev);
|
|
rcu_read_unlock_bh();
|
|
|
|
skb_pull(skb, ETH_HLEN);
|
|
}
|
|
|
|
/* reset skb device */
|
|
nf_reset_ct(skb);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
/* modelled after ip6_finish_output2 */
|
|
static int vrf_finish_output6(struct net *net, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
struct net_device *dev = dst->dev;
|
|
const struct in6_addr *nexthop;
|
|
struct neighbour *neigh;
|
|
int ret;
|
|
|
|
nf_reset_ct(skb);
|
|
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
skb->dev = dev;
|
|
|
|
rcu_read_lock_bh();
|
|
nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
|
|
neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
|
|
if (unlikely(!neigh))
|
|
neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
|
|
if (!IS_ERR(neigh)) {
|
|
sock_confirm_neigh(skb, neigh);
|
|
ret = neigh_output(neigh, skb, false);
|
|
rcu_read_unlock_bh();
|
|
return ret;
|
|
}
|
|
rcu_read_unlock_bh();
|
|
|
|
IP6_INC_STATS(dev_net(dst->dev),
|
|
ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* modelled after ip6_output */
|
|
static int vrf_output6(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
|
|
net, sk, skb, NULL, skb_dst(skb)->dev,
|
|
vrf_finish_output6,
|
|
!(IP6CB(skb)->flags & IP6SKB_REROUTED));
|
|
}
|
|
|
|
/* set dst on skb to send packet to us via dev_xmit path. Allows
|
|
* packet to go through device based features such as qdisc, netfilter
|
|
* hooks and packet sockets with skb->dev set to vrf device.
|
|
*/
|
|
static struct sk_buff *vrf_ip6_out_redirect(struct net_device *vrf_dev,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(vrf_dev);
|
|
struct dst_entry *dst = NULL;
|
|
struct rt6_info *rt6;
|
|
|
|
rcu_read_lock();
|
|
|
|
rt6 = rcu_dereference(vrf->rt6);
|
|
if (likely(rt6)) {
|
|
dst = &rt6->dst;
|
|
dst_hold(dst);
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
if (unlikely(!dst)) {
|
|
vrf_tx_error(vrf_dev, skb);
|
|
return NULL;
|
|
}
|
|
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, dst);
|
|
|
|
return skb;
|
|
}
|
|
|
|
static int vrf_output6_direct_finish(struct net *net, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
vrf_finish_direct(skb);
|
|
|
|
return vrf_ip6_local_out(net, sk, skb);
|
|
}
|
|
|
|
static int vrf_output6_direct(struct net *net, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
int err = 1;
|
|
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
|
|
if (!(IPCB(skb)->flags & IPSKB_REROUTED))
|
|
err = nf_hook(NFPROTO_IPV6, NF_INET_POST_ROUTING, net, sk, skb,
|
|
NULL, skb->dev, vrf_output6_direct_finish);
|
|
|
|
if (likely(err == 1))
|
|
vrf_finish_direct(skb);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int vrf_ip6_out_direct_finish(struct net *net, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
|
|
err = vrf_output6_direct(net, sk, skb);
|
|
if (likely(err == 1))
|
|
err = vrf_ip6_local_out(net, sk, skb);
|
|
|
|
return err;
|
|
}
|
|
|
|
static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev,
|
|
struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct net *net = dev_net(vrf_dev);
|
|
int err;
|
|
|
|
skb->dev = vrf_dev;
|
|
|
|
err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk,
|
|
skb, NULL, vrf_dev, vrf_ip6_out_direct_finish);
|
|
|
|
if (likely(err == 1))
|
|
err = vrf_output6_direct(net, sk, skb);
|
|
|
|
if (likely(err == 1))
|
|
return skb;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
|
|
struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
/* don't divert link scope packets */
|
|
if (rt6_need_strict(&ipv6_hdr(skb)->daddr))
|
|
return skb;
|
|
|
|
if (qdisc_tx_is_default(vrf_dev) ||
|
|
IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED)
|
|
return vrf_ip6_out_direct(vrf_dev, sk, skb);
|
|
|
|
return vrf_ip6_out_redirect(vrf_dev, skb);
|
|
}
|
|
|
|
/* holding rtnl */
|
|
static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
|
|
{
|
|
struct rt6_info *rt6 = rtnl_dereference(vrf->rt6);
|
|
struct net *net = dev_net(dev);
|
|
struct dst_entry *dst;
|
|
|
|
RCU_INIT_POINTER(vrf->rt6, NULL);
|
|
synchronize_rcu();
|
|
|
|
/* move dev in dst's to loopback so this VRF device can be deleted
|
|
* - based on dst_ifdown
|
|
*/
|
|
if (rt6) {
|
|
dst = &rt6->dst;
|
|
dev_put(dst->dev);
|
|
dst->dev = net->loopback_dev;
|
|
dev_hold(dst->dev);
|
|
dst_release(dst);
|
|
}
|
|
}
|
|
|
|
static int vrf_rt6_create(struct net_device *dev)
|
|
{
|
|
int flags = DST_NOPOLICY | DST_NOXFRM;
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
struct net *net = dev_net(dev);
|
|
struct rt6_info *rt6;
|
|
int rc = -ENOMEM;
|
|
|
|
/* IPv6 can be CONFIG enabled and then disabled runtime */
|
|
if (!ipv6_mod_enabled())
|
|
return 0;
|
|
|
|
vrf->fib6_table = fib6_new_table(net, vrf->tb_id);
|
|
if (!vrf->fib6_table)
|
|
goto out;
|
|
|
|
/* create a dst for routing packets out a VRF device */
|
|
rt6 = ip6_dst_alloc(net, dev, flags);
|
|
if (!rt6)
|
|
goto out;
|
|
|
|
rt6->dst.output = vrf_output6;
|
|
|
|
rcu_assign_pointer(vrf->rt6, rt6);
|
|
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
}
|
|
#else
|
|
static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
|
|
struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
return skb;
|
|
}
|
|
|
|
static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
|
|
{
|
|
}
|
|
|
|
static int vrf_rt6_create(struct net_device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* modelled after ip_finish_output2 */
|
|
static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
struct rtable *rt = (struct rtable *)dst;
|
|
struct net_device *dev = dst->dev;
|
|
unsigned int hh_len = LL_RESERVED_SPACE(dev);
|
|
struct neighbour *neigh;
|
|
bool is_v6gw = false;
|
|
int ret = -EINVAL;
|
|
|
|
nf_reset_ct(skb);
|
|
|
|
/* Be paranoid, rather than too clever. */
|
|
if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
|
|
struct sk_buff *skb2;
|
|
|
|
skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
|
|
if (!skb2) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
if (skb->sk)
|
|
skb_set_owner_w(skb2, skb->sk);
|
|
|
|
consume_skb(skb);
|
|
skb = skb2;
|
|
}
|
|
|
|
rcu_read_lock_bh();
|
|
|
|
neigh = ip_neigh_for_gw(rt, skb, &is_v6gw);
|
|
if (!IS_ERR(neigh)) {
|
|
sock_confirm_neigh(skb, neigh);
|
|
/* if crossing protocols, can not use the cached header */
|
|
ret = neigh_output(neigh, skb, is_v6gw);
|
|
rcu_read_unlock_bh();
|
|
return ret;
|
|
}
|
|
|
|
rcu_read_unlock_bh();
|
|
err:
|
|
vrf_tx_error(skb->dev, skb);
|
|
return ret;
|
|
}
|
|
|
|
static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct net_device *dev = skb_dst(skb)->dev;
|
|
|
|
IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
|
|
|
|
skb->dev = dev;
|
|
skb->protocol = htons(ETH_P_IP);
|
|
|
|
return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
|
|
net, sk, skb, NULL, dev,
|
|
vrf_finish_output,
|
|
!(IPCB(skb)->flags & IPSKB_REROUTED));
|
|
}
|
|
|
|
/* set dst on skb to send packet to us via dev_xmit path. Allows
|
|
* packet to go through device based features such as qdisc, netfilter
|
|
* hooks and packet sockets with skb->dev set to vrf device.
|
|
*/
|
|
static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(vrf_dev);
|
|
struct dst_entry *dst = NULL;
|
|
struct rtable *rth;
|
|
|
|
rcu_read_lock();
|
|
|
|
rth = rcu_dereference(vrf->rth);
|
|
if (likely(rth)) {
|
|
dst = &rth->dst;
|
|
dst_hold(dst);
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
if (unlikely(!dst)) {
|
|
vrf_tx_error(vrf_dev, skb);
|
|
return NULL;
|
|
}
|
|
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, dst);
|
|
|
|
return skb;
|
|
}
|
|
|
|
static int vrf_output_direct_finish(struct net *net, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
vrf_finish_direct(skb);
|
|
|
|
return vrf_ip_local_out(net, sk, skb);
|
|
}
|
|
|
|
static int vrf_output_direct(struct net *net, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
int err = 1;
|
|
|
|
skb->protocol = htons(ETH_P_IP);
|
|
|
|
if (!(IPCB(skb)->flags & IPSKB_REROUTED))
|
|
err = nf_hook(NFPROTO_IPV4, NF_INET_POST_ROUTING, net, sk, skb,
|
|
NULL, skb->dev, vrf_output_direct_finish);
|
|
|
|
if (likely(err == 1))
|
|
vrf_finish_direct(skb);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int vrf_ip_out_direct_finish(struct net *net, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
|
|
err = vrf_output_direct(net, sk, skb);
|
|
if (likely(err == 1))
|
|
err = vrf_ip_local_out(net, sk, skb);
|
|
|
|
return err;
|
|
}
|
|
|
|
static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev,
|
|
struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct net *net = dev_net(vrf_dev);
|
|
int err;
|
|
|
|
skb->dev = vrf_dev;
|
|
|
|
err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
|
|
skb, NULL, vrf_dev, vrf_ip_out_direct_finish);
|
|
|
|
if (likely(err == 1))
|
|
err = vrf_output_direct(net, sk, skb);
|
|
|
|
if (likely(err == 1))
|
|
return skb;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
|
|
struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
/* don't divert multicast or local broadcast */
|
|
if (ipv4_is_multicast(ip_hdr(skb)->daddr) ||
|
|
ipv4_is_lbcast(ip_hdr(skb)->daddr))
|
|
return skb;
|
|
|
|
if (qdisc_tx_is_default(vrf_dev) ||
|
|
IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED)
|
|
return vrf_ip_out_direct(vrf_dev, sk, skb);
|
|
|
|
return vrf_ip_out_redirect(vrf_dev, skb);
|
|
}
|
|
|
|
/* called with rcu lock held */
|
|
static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev,
|
|
struct sock *sk,
|
|
struct sk_buff *skb,
|
|
u16 proto)
|
|
{
|
|
switch (proto) {
|
|
case AF_INET:
|
|
return vrf_ip_out(vrf_dev, sk, skb);
|
|
case AF_INET6:
|
|
return vrf_ip6_out(vrf_dev, sk, skb);
|
|
}
|
|
|
|
return skb;
|
|
}
|
|
|
|
/* holding rtnl */
|
|
static void vrf_rtable_release(struct net_device *dev, struct net_vrf *vrf)
|
|
{
|
|
struct rtable *rth = rtnl_dereference(vrf->rth);
|
|
struct net *net = dev_net(dev);
|
|
struct dst_entry *dst;
|
|
|
|
RCU_INIT_POINTER(vrf->rth, NULL);
|
|
synchronize_rcu();
|
|
|
|
/* move dev in dst's to loopback so this VRF device can be deleted
|
|
* - based on dst_ifdown
|
|
*/
|
|
if (rth) {
|
|
dst = &rth->dst;
|
|
dev_put(dst->dev);
|
|
dst->dev = net->loopback_dev;
|
|
dev_hold(dst->dev);
|
|
dst_release(dst);
|
|
}
|
|
}
|
|
|
|
static int vrf_rtable_create(struct net_device *dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
struct rtable *rth;
|
|
|
|
if (!fib_new_table(dev_net(dev), vrf->tb_id))
|
|
return -ENOMEM;
|
|
|
|
/* create a dst for routing packets out through a VRF device */
|
|
rth = rt_dst_alloc(dev, 0, RTN_UNICAST, 1, 1);
|
|
if (!rth)
|
|
return -ENOMEM;
|
|
|
|
rth->dst.output = vrf_output;
|
|
|
|
rcu_assign_pointer(vrf->rth, rth);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**************************** device handling ********************/
|
|
|
|
/* cycle interface to flush neighbor cache and move routes across tables */
|
|
static void cycle_netdev(struct net_device *dev,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
unsigned int flags = dev->flags;
|
|
int ret;
|
|
|
|
if (!netif_running(dev))
|
|
return;
|
|
|
|
ret = dev_change_flags(dev, flags & ~IFF_UP, extack);
|
|
if (ret >= 0)
|
|
ret = dev_change_flags(dev, flags, extack);
|
|
|
|
if (ret < 0) {
|
|
netdev_err(dev,
|
|
"Failed to cycle device %s; route tables might be wrong!\n",
|
|
dev->name);
|
|
}
|
|
}
|
|
|
|
static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
int ret;
|
|
|
|
/* do not allow loopback device to be enslaved to a VRF.
|
|
* The vrf device acts as the loopback for the vrf.
|
|
*/
|
|
if (port_dev == dev_net(dev)->loopback_dev) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Can not enslave loopback device to a VRF");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
|
|
ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL, extack);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
cycle_netdev(port_dev, extack);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
|
|
return ret;
|
|
}
|
|
|
|
static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (netif_is_l3_master(port_dev)) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Can not enslave an L3 master device to a VRF");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (netif_is_l3_slave(port_dev))
|
|
return -EINVAL;
|
|
|
|
return do_vrf_add_slave(dev, port_dev, extack);
|
|
}
|
|
|
|
/* inverse of do_vrf_add_slave */
|
|
static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
|
|
{
|
|
netdev_upper_dev_unlink(port_dev, dev);
|
|
port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
|
|
|
|
cycle_netdev(port_dev, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
|
|
{
|
|
return do_vrf_del_slave(dev, port_dev);
|
|
}
|
|
|
|
static void vrf_dev_uninit(struct net_device *dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
|
|
vrf_rtable_release(dev, vrf);
|
|
vrf_rt6_release(dev, vrf);
|
|
|
|
free_percpu(dev->dstats);
|
|
dev->dstats = NULL;
|
|
}
|
|
|
|
static int vrf_dev_init(struct net_device *dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
|
|
dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
|
|
if (!dev->dstats)
|
|
goto out_nomem;
|
|
|
|
/* create the default dst which points back to us */
|
|
if (vrf_rtable_create(dev) != 0)
|
|
goto out_stats;
|
|
|
|
if (vrf_rt6_create(dev) != 0)
|
|
goto out_rth;
|
|
|
|
dev->flags = IFF_MASTER | IFF_NOARP;
|
|
|
|
/* MTU is irrelevant for VRF device; set to 64k similar to lo */
|
|
dev->mtu = 64 * 1024;
|
|
|
|
/* similarly, oper state is irrelevant; set to up to avoid confusion */
|
|
dev->operstate = IF_OPER_UP;
|
|
netdev_lockdep_set_classes(dev);
|
|
return 0;
|
|
|
|
out_rth:
|
|
vrf_rtable_release(dev, vrf);
|
|
out_stats:
|
|
free_percpu(dev->dstats);
|
|
dev->dstats = NULL;
|
|
out_nomem:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static const struct net_device_ops vrf_netdev_ops = {
|
|
.ndo_init = vrf_dev_init,
|
|
.ndo_uninit = vrf_dev_uninit,
|
|
.ndo_start_xmit = vrf_xmit,
|
|
.ndo_set_mac_address = eth_mac_addr,
|
|
.ndo_get_stats64 = vrf_get_stats64,
|
|
.ndo_add_slave = vrf_add_slave,
|
|
.ndo_del_slave = vrf_del_slave,
|
|
};
|
|
|
|
static u32 vrf_fib_table(const struct net_device *dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
|
|
return vrf->tb_id;
|
|
}
|
|
|
|
static int vrf_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static struct sk_buff *vrf_rcv_nfhook(u8 pf, unsigned int hook,
|
|
struct sk_buff *skb,
|
|
struct net_device *dev)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
|
|
if (nf_hook(pf, hook, net, NULL, skb, dev, NULL, vrf_rcv_finish) != 1)
|
|
skb = NULL; /* kfree_skb(skb) handled by nf code */
|
|
|
|
return skb;
|
|
}
|
|
|
|
static int vrf_prepare_mac_header(struct sk_buff *skb,
|
|
struct net_device *vrf_dev, u16 proto)
|
|
{
|
|
struct ethhdr *eth;
|
|
int err;
|
|
|
|
/* in general, we do not know if there is enough space in the head of
|
|
* the packet for hosting the mac header.
|
|
*/
|
|
err = skb_cow_head(skb, LL_RESERVED_SPACE(vrf_dev));
|
|
if (unlikely(err))
|
|
/* no space in the skb head */
|
|
return -ENOBUFS;
|
|
|
|
__skb_push(skb, ETH_HLEN);
|
|
eth = (struct ethhdr *)skb->data;
|
|
|
|
skb_reset_mac_header(skb);
|
|
|
|
/* we set the ethernet destination and the source addresses to the
|
|
* address of the VRF device.
|
|
*/
|
|
ether_addr_copy(eth->h_dest, vrf_dev->dev_addr);
|
|
ether_addr_copy(eth->h_source, vrf_dev->dev_addr);
|
|
eth->h_proto = htons(proto);
|
|
|
|
/* the destination address of the Ethernet frame corresponds to the
|
|
* address set on the VRF interface; therefore, the packet is intended
|
|
* to be processed locally.
|
|
*/
|
|
skb->protocol = eth->h_proto;
|
|
skb->pkt_type = PACKET_HOST;
|
|
|
|
skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
|
|
|
|
skb_pull_inline(skb, ETH_HLEN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* prepare and add the mac header to the packet if it was not set previously.
|
|
* In this way, packet sniffers such as tcpdump can parse the packet correctly.
|
|
* If the mac header was already set, the original mac header is left
|
|
* untouched and the function returns immediately.
|
|
*/
|
|
static int vrf_add_mac_header_if_unset(struct sk_buff *skb,
|
|
struct net_device *vrf_dev,
|
|
u16 proto)
|
|
{
|
|
if (skb_mac_header_was_set(skb))
|
|
return 0;
|
|
|
|
return vrf_prepare_mac_header(skb, vrf_dev, proto);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
/* neighbor handling is done with actual device; do not want
|
|
* to flip skb->dev for those ndisc packets. This really fails
|
|
* for multiple next protocols (e.g., NEXTHDR_HOP). But it is
|
|
* a start.
|
|
*/
|
|
static bool ipv6_ndisc_frame(const struct sk_buff *skb)
|
|
{
|
|
const struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
bool rc = false;
|
|
|
|
if (iph->nexthdr == NEXTHDR_ICMP) {
|
|
const struct icmp6hdr *icmph;
|
|
struct icmp6hdr _icmph;
|
|
|
|
icmph = skb_header_pointer(skb, sizeof(*iph),
|
|
sizeof(_icmph), &_icmph);
|
|
if (!icmph)
|
|
goto out;
|
|
|
|
switch (icmph->icmp6_type) {
|
|
case NDISC_ROUTER_SOLICITATION:
|
|
case NDISC_ROUTER_ADVERTISEMENT:
|
|
case NDISC_NEIGHBOUR_SOLICITATION:
|
|
case NDISC_NEIGHBOUR_ADVERTISEMENT:
|
|
case NDISC_REDIRECT:
|
|
rc = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static struct rt6_info *vrf_ip6_route_lookup(struct net *net,
|
|
const struct net_device *dev,
|
|
struct flowi6 *fl6,
|
|
int ifindex,
|
|
const struct sk_buff *skb,
|
|
int flags)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
|
|
return ip6_pol_route(net, vrf->fib6_table, ifindex, fl6, skb, flags);
|
|
}
|
|
|
|
static void vrf_ip6_input_dst(struct sk_buff *skb, struct net_device *vrf_dev,
|
|
int ifindex)
|
|
{
|
|
const struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
struct flowi6 fl6 = {
|
|
.flowi6_iif = ifindex,
|
|
.flowi6_mark = skb->mark,
|
|
.flowi6_proto = iph->nexthdr,
|
|
.daddr = iph->daddr,
|
|
.saddr = iph->saddr,
|
|
.flowlabel = ip6_flowinfo(iph),
|
|
};
|
|
struct net *net = dev_net(vrf_dev);
|
|
struct rt6_info *rt6;
|
|
|
|
rt6 = vrf_ip6_route_lookup(net, vrf_dev, &fl6, ifindex, skb,
|
|
RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE);
|
|
if (unlikely(!rt6))
|
|
return;
|
|
|
|
if (unlikely(&rt6->dst == &net->ipv6.ip6_null_entry->dst))
|
|
return;
|
|
|
|
skb_dst_set(skb, &rt6->dst);
|
|
}
|
|
|
|
static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
|
|
struct sk_buff *skb)
|
|
{
|
|
int orig_iif = skb->skb_iif;
|
|
bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
|
|
bool is_ndisc = ipv6_ndisc_frame(skb);
|
|
bool is_ll_src;
|
|
|
|
/* loopback, multicast & non-ND link-local traffic; do not push through
|
|
* packet taps again. Reset pkt_type for upper layers to process skb.
|
|
* for packets with lladdr src, however, skip so that the dst can be
|
|
* determine at input using original ifindex in the case that daddr
|
|
* needs strict
|
|
*/
|
|
is_ll_src = ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL;
|
|
if (skb->pkt_type == PACKET_LOOPBACK ||
|
|
(need_strict && !is_ndisc && !is_ll_src)) {
|
|
skb->dev = vrf_dev;
|
|
skb->skb_iif = vrf_dev->ifindex;
|
|
IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
|
|
if (skb->pkt_type == PACKET_LOOPBACK)
|
|
skb->pkt_type = PACKET_HOST;
|
|
goto out;
|
|
}
|
|
|
|
/* if packet is NDISC then keep the ingress interface */
|
|
if (!is_ndisc) {
|
|
vrf_rx_stats(vrf_dev, skb->len);
|
|
skb->dev = vrf_dev;
|
|
skb->skb_iif = vrf_dev->ifindex;
|
|
|
|
if (!list_empty(&vrf_dev->ptype_all)) {
|
|
int err;
|
|
|
|
err = vrf_add_mac_header_if_unset(skb, vrf_dev,
|
|
ETH_P_IPV6);
|
|
if (likely(!err)) {
|
|
skb_push(skb, skb->mac_len);
|
|
dev_queue_xmit_nit(skb, vrf_dev);
|
|
skb_pull(skb, skb->mac_len);
|
|
}
|
|
}
|
|
|
|
IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
|
|
}
|
|
|
|
if (need_strict)
|
|
vrf_ip6_input_dst(skb, vrf_dev, orig_iif);
|
|
|
|
skb = vrf_rcv_nfhook(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, vrf_dev);
|
|
out:
|
|
return skb;
|
|
}
|
|
|
|
#else
|
|
static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
|
|
struct sk_buff *skb)
|
|
{
|
|
return skb;
|
|
}
|
|
#endif
|
|
|
|
static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev,
|
|
struct sk_buff *skb)
|
|
{
|
|
skb->dev = vrf_dev;
|
|
skb->skb_iif = vrf_dev->ifindex;
|
|
IPCB(skb)->flags |= IPSKB_L3SLAVE;
|
|
|
|
if (ipv4_is_multicast(ip_hdr(skb)->daddr))
|
|
goto out;
|
|
|
|
/* loopback traffic; do not push through packet taps again.
|
|
* Reset pkt_type for upper layers to process skb
|
|
*/
|
|
if (skb->pkt_type == PACKET_LOOPBACK) {
|
|
skb->pkt_type = PACKET_HOST;
|
|
goto out;
|
|
}
|
|
|
|
vrf_rx_stats(vrf_dev, skb->len);
|
|
|
|
if (!list_empty(&vrf_dev->ptype_all)) {
|
|
int err;
|
|
|
|
err = vrf_add_mac_header_if_unset(skb, vrf_dev, ETH_P_IP);
|
|
if (likely(!err)) {
|
|
skb_push(skb, skb->mac_len);
|
|
dev_queue_xmit_nit(skb, vrf_dev);
|
|
skb_pull(skb, skb->mac_len);
|
|
}
|
|
}
|
|
|
|
skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev);
|
|
out:
|
|
return skb;
|
|
}
|
|
|
|
/* called with rcu lock held */
|
|
static struct sk_buff *vrf_l3_rcv(struct net_device *vrf_dev,
|
|
struct sk_buff *skb,
|
|
u16 proto)
|
|
{
|
|
switch (proto) {
|
|
case AF_INET:
|
|
return vrf_ip_rcv(vrf_dev, skb);
|
|
case AF_INET6:
|
|
return vrf_ip6_rcv(vrf_dev, skb);
|
|
}
|
|
|
|
return skb;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
/* send to link-local or multicast address via interface enslaved to
|
|
* VRF device. Force lookup to VRF table without changing flow struct
|
|
* Note: Caller to this function must hold rcu_read_lock() and no refcnt
|
|
* is taken on the dst by this function.
|
|
*/
|
|
static struct dst_entry *vrf_link_scope_lookup(const struct net_device *dev,
|
|
struct flowi6 *fl6)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_DST_NOREF;
|
|
struct dst_entry *dst = NULL;
|
|
struct rt6_info *rt;
|
|
|
|
/* VRF device does not have a link-local address and
|
|
* sending packets to link-local or mcast addresses over
|
|
* a VRF device does not make sense
|
|
*/
|
|
if (fl6->flowi6_oif == dev->ifindex) {
|
|
dst = &net->ipv6.ip6_null_entry->dst;
|
|
return dst;
|
|
}
|
|
|
|
if (!ipv6_addr_any(&fl6->saddr))
|
|
flags |= RT6_LOOKUP_F_HAS_SADDR;
|
|
|
|
rt = vrf_ip6_route_lookup(net, dev, fl6, fl6->flowi6_oif, NULL, flags);
|
|
if (rt)
|
|
dst = &rt->dst;
|
|
|
|
return dst;
|
|
}
|
|
#endif
|
|
|
|
static const struct l3mdev_ops vrf_l3mdev_ops = {
|
|
.l3mdev_fib_table = vrf_fib_table,
|
|
.l3mdev_l3_rcv = vrf_l3_rcv,
|
|
.l3mdev_l3_out = vrf_l3_out,
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
.l3mdev_link_scope_lookup = vrf_link_scope_lookup,
|
|
#endif
|
|
};
|
|
|
|
static void vrf_get_drvinfo(struct net_device *dev,
|
|
struct ethtool_drvinfo *info)
|
|
{
|
|
strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
|
|
strlcpy(info->version, DRV_VERSION, sizeof(info->version));
|
|
}
|
|
|
|
static const struct ethtool_ops vrf_ethtool_ops = {
|
|
.get_drvinfo = vrf_get_drvinfo,
|
|
};
|
|
|
|
static inline size_t vrf_fib_rule_nl_size(void)
|
|
{
|
|
size_t sz;
|
|
|
|
sz = NLMSG_ALIGN(sizeof(struct fib_rule_hdr));
|
|
sz += nla_total_size(sizeof(u8)); /* FRA_L3MDEV */
|
|
sz += nla_total_size(sizeof(u32)); /* FRA_PRIORITY */
|
|
sz += nla_total_size(sizeof(u8)); /* FRA_PROTOCOL */
|
|
|
|
return sz;
|
|
}
|
|
|
|
static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it)
|
|
{
|
|
struct fib_rule_hdr *frh;
|
|
struct nlmsghdr *nlh;
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
if ((family == AF_INET6 || family == RTNL_FAMILY_IP6MR) &&
|
|
!ipv6_mod_enabled())
|
|
return 0;
|
|
|
|
skb = nlmsg_new(vrf_fib_rule_nl_size(), GFP_KERNEL);
|
|
if (!skb)
|
|
return -ENOMEM;
|
|
|
|
nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*frh), 0);
|
|
if (!nlh)
|
|
goto nla_put_failure;
|
|
|
|
/* rule only needs to appear once */
|
|
nlh->nlmsg_flags |= NLM_F_EXCL;
|
|
|
|
frh = nlmsg_data(nlh);
|
|
memset(frh, 0, sizeof(*frh));
|
|
frh->family = family;
|
|
frh->action = FR_ACT_TO_TBL;
|
|
|
|
if (nla_put_u8(skb, FRA_PROTOCOL, RTPROT_KERNEL))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u8(skb, FRA_L3MDEV, 1))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
|
|
/* fib_nl_{new,del}rule handling looks for net from skb->sk */
|
|
skb->sk = dev_net(dev)->rtnl;
|
|
if (add_it) {
|
|
err = fib_nl_newrule(skb, nlh, NULL);
|
|
if (err == -EEXIST)
|
|
err = 0;
|
|
} else {
|
|
err = fib_nl_delrule(skb, nlh, NULL);
|
|
if (err == -ENOENT)
|
|
err = 0;
|
|
}
|
|
nlmsg_free(skb);
|
|
|
|
return err;
|
|
|
|
nla_put_failure:
|
|
nlmsg_free(skb);
|
|
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int vrf_add_fib_rules(const struct net_device *dev)
|
|
{
|
|
int err;
|
|
|
|
err = vrf_fib_rule(dev, AF_INET, true);
|
|
if (err < 0)
|
|
goto out_err;
|
|
|
|
err = vrf_fib_rule(dev, AF_INET6, true);
|
|
if (err < 0)
|
|
goto ipv6_err;
|
|
|
|
#if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
|
|
err = vrf_fib_rule(dev, RTNL_FAMILY_IPMR, true);
|
|
if (err < 0)
|
|
goto ipmr_err;
|
|
#endif
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES)
|
|
err = vrf_fib_rule(dev, RTNL_FAMILY_IP6MR, true);
|
|
if (err < 0)
|
|
goto ip6mr_err;
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6_MROUTE_MULTIPLE_TABLES)
|
|
ip6mr_err:
|
|
vrf_fib_rule(dev, RTNL_FAMILY_IPMR, false);
|
|
#endif
|
|
|
|
#if IS_ENABLED(CONFIG_IP_MROUTE_MULTIPLE_TABLES)
|
|
ipmr_err:
|
|
vrf_fib_rule(dev, AF_INET6, false);
|
|
#endif
|
|
|
|
ipv6_err:
|
|
vrf_fib_rule(dev, AF_INET, false);
|
|
|
|
out_err:
|
|
netdev_err(dev, "Failed to add FIB rules.\n");
|
|
return err;
|
|
}
|
|
|
|
static void vrf_setup(struct net_device *dev)
|
|
{
|
|
ether_setup(dev);
|
|
|
|
/* Initialize the device structure. */
|
|
dev->netdev_ops = &vrf_netdev_ops;
|
|
dev->l3mdev_ops = &vrf_l3mdev_ops;
|
|
dev->ethtool_ops = &vrf_ethtool_ops;
|
|
dev->needs_free_netdev = true;
|
|
|
|
/* Fill in device structure with ethernet-generic values. */
|
|
eth_hw_addr_random(dev);
|
|
|
|
/* don't acquire vrf device's netif_tx_lock when transmitting */
|
|
dev->features |= NETIF_F_LLTX;
|
|
|
|
/* don't allow vrf devices to change network namespaces. */
|
|
dev->features |= NETIF_F_NETNS_LOCAL;
|
|
|
|
/* does not make sense for a VLAN to be added to a vrf device */
|
|
dev->features |= NETIF_F_VLAN_CHALLENGED;
|
|
|
|
/* enable offload features */
|
|
dev->features |= NETIF_F_GSO_SOFTWARE;
|
|
dev->features |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC;
|
|
dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
|
|
|
|
dev->hw_features = dev->features;
|
|
dev->hw_enc_features = dev->features;
|
|
|
|
/* default to no qdisc; user can add if desired */
|
|
dev->priv_flags |= IFF_NO_QUEUE;
|
|
dev->priv_flags |= IFF_NO_RX_HANDLER;
|
|
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
|
|
|
|
/* VRF devices do not care about MTU, but if the MTU is set
|
|
* too low then the ipv4 and ipv6 protocols are disabled
|
|
* which breaks networking.
|
|
*/
|
|
dev->min_mtu = IPV6_MIN_MTU;
|
|
dev->max_mtu = ETH_MAX_MTU;
|
|
}
|
|
|
|
static int vrf_validate(struct nlattr *tb[], struct nlattr *data[],
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (tb[IFLA_ADDRESS]) {
|
|
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
|
|
NL_SET_ERR_MSG(extack, "Invalid hardware address");
|
|
return -EINVAL;
|
|
}
|
|
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
|
|
NL_SET_ERR_MSG(extack, "Invalid hardware address");
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void vrf_dellink(struct net_device *dev, struct list_head *head)
|
|
{
|
|
struct net_device *port_dev;
|
|
struct list_head *iter;
|
|
|
|
netdev_for_each_lower_dev(dev, port_dev, iter)
|
|
vrf_del_slave(dev, port_dev);
|
|
|
|
vrf_map_unregister_dev(dev);
|
|
|
|
unregister_netdevice_queue(dev, head);
|
|
}
|
|
|
|
static int vrf_newlink(struct net *src_net, struct net_device *dev,
|
|
struct nlattr *tb[], struct nlattr *data[],
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
struct netns_vrf *nn_vrf;
|
|
bool *add_fib_rules;
|
|
struct net *net;
|
|
int err;
|
|
|
|
if (!data || !data[IFLA_VRF_TABLE]) {
|
|
NL_SET_ERR_MSG(extack, "VRF table id is missing");
|
|
return -EINVAL;
|
|
}
|
|
|
|
vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
|
|
if (vrf->tb_id == RT_TABLE_UNSPEC) {
|
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VRF_TABLE],
|
|
"Invalid VRF table id");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev->priv_flags |= IFF_L3MDEV_MASTER;
|
|
|
|
err = register_netdevice(dev);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* mapping between table_id and vrf;
|
|
* note: such binding could not be done in the dev init function
|
|
* because dev->ifindex id is not available yet.
|
|
*/
|
|
vrf->ifindex = dev->ifindex;
|
|
|
|
err = vrf_map_register_dev(dev, extack);
|
|
if (err) {
|
|
unregister_netdevice(dev);
|
|
goto out;
|
|
}
|
|
|
|
net = dev_net(dev);
|
|
nn_vrf = net_generic(net, vrf_net_id);
|
|
|
|
add_fib_rules = &nn_vrf->add_fib_rules;
|
|
if (*add_fib_rules) {
|
|
err = vrf_add_fib_rules(dev);
|
|
if (err) {
|
|
vrf_map_unregister_dev(dev);
|
|
unregister_netdevice(dev);
|
|
goto out;
|
|
}
|
|
*add_fib_rules = false;
|
|
}
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static size_t vrf_nl_getsize(const struct net_device *dev)
|
|
{
|
|
return nla_total_size(sizeof(u32)); /* IFLA_VRF_TABLE */
|
|
}
|
|
|
|
static int vrf_fillinfo(struct sk_buff *skb,
|
|
const struct net_device *dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
|
|
return nla_put_u32(skb, IFLA_VRF_TABLE, vrf->tb_id);
|
|
}
|
|
|
|
static size_t vrf_get_slave_size(const struct net_device *bond_dev,
|
|
const struct net_device *slave_dev)
|
|
{
|
|
return nla_total_size(sizeof(u32)); /* IFLA_VRF_PORT_TABLE */
|
|
}
|
|
|
|
static int vrf_fill_slave_info(struct sk_buff *skb,
|
|
const struct net_device *vrf_dev,
|
|
const struct net_device *slave_dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(vrf_dev);
|
|
|
|
if (nla_put_u32(skb, IFLA_VRF_PORT_TABLE, vrf->tb_id))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct nla_policy vrf_nl_policy[IFLA_VRF_MAX + 1] = {
|
|
[IFLA_VRF_TABLE] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static struct rtnl_link_ops vrf_link_ops __read_mostly = {
|
|
.kind = DRV_NAME,
|
|
.priv_size = sizeof(struct net_vrf),
|
|
|
|
.get_size = vrf_nl_getsize,
|
|
.policy = vrf_nl_policy,
|
|
.validate = vrf_validate,
|
|
.fill_info = vrf_fillinfo,
|
|
|
|
.get_slave_size = vrf_get_slave_size,
|
|
.fill_slave_info = vrf_fill_slave_info,
|
|
|
|
.newlink = vrf_newlink,
|
|
.dellink = vrf_dellink,
|
|
.setup = vrf_setup,
|
|
.maxtype = IFLA_VRF_MAX,
|
|
};
|
|
|
|
static int vrf_device_event(struct notifier_block *unused,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
|
|
/* only care about unregister events to drop slave references */
|
|
if (event == NETDEV_UNREGISTER) {
|
|
struct net_device *vrf_dev;
|
|
|
|
if (!netif_is_l3_slave(dev))
|
|
goto out;
|
|
|
|
vrf_dev = netdev_master_upper_dev_get(dev);
|
|
vrf_del_slave(vrf_dev, dev);
|
|
}
|
|
out:
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block vrf_notifier_block __read_mostly = {
|
|
.notifier_call = vrf_device_event,
|
|
};
|
|
|
|
static int vrf_map_init(struct vrf_map *vmap)
|
|
{
|
|
spin_lock_init(&vmap->vmap_lock);
|
|
hash_init(vmap->ht);
|
|
|
|
vmap->strict_mode = false;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
static bool vrf_strict_mode(struct vrf_map *vmap)
|
|
{
|
|
bool strict_mode;
|
|
|
|
vrf_map_lock(vmap);
|
|
strict_mode = vmap->strict_mode;
|
|
vrf_map_unlock(vmap);
|
|
|
|
return strict_mode;
|
|
}
|
|
|
|
static int vrf_strict_mode_change(struct vrf_map *vmap, bool new_mode)
|
|
{
|
|
bool *cur_mode;
|
|
int res = 0;
|
|
|
|
vrf_map_lock(vmap);
|
|
|
|
cur_mode = &vmap->strict_mode;
|
|
if (*cur_mode == new_mode)
|
|
goto unlock;
|
|
|
|
if (*cur_mode) {
|
|
/* disable strict mode */
|
|
*cur_mode = false;
|
|
} else {
|
|
if (vmap->shared_tables) {
|
|
/* we cannot allow strict_mode because there are some
|
|
* vrfs that share one or more tables.
|
|
*/
|
|
res = -EBUSY;
|
|
goto unlock;
|
|
}
|
|
|
|
/* no tables are shared among vrfs, so we can go back
|
|
* to 1:1 association between a vrf with its table.
|
|
*/
|
|
*cur_mode = true;
|
|
}
|
|
|
|
unlock:
|
|
vrf_map_unlock(vmap);
|
|
|
|
return res;
|
|
}
|
|
|
|
static int vrf_shared_table_handler(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct net *net = (struct net *)table->extra1;
|
|
struct vrf_map *vmap = netns_vrf_map(net);
|
|
int proc_strict_mode = 0;
|
|
struct ctl_table tmp = {
|
|
.procname = table->procname,
|
|
.data = &proc_strict_mode,
|
|
.maxlen = sizeof(int),
|
|
.mode = table->mode,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_ONE,
|
|
};
|
|
int ret;
|
|
|
|
if (!write)
|
|
proc_strict_mode = vrf_strict_mode(vmap);
|
|
|
|
ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
|
|
|
|
if (write && ret == 0)
|
|
ret = vrf_strict_mode_change(vmap, (bool)proc_strict_mode);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct ctl_table vrf_table[] = {
|
|
{
|
|
.procname = "strict_mode",
|
|
.data = NULL,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = vrf_shared_table_handler,
|
|
/* set by the vrf_netns_init */
|
|
.extra1 = NULL,
|
|
},
|
|
{ },
|
|
};
|
|
|
|
static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf)
|
|
{
|
|
struct ctl_table *table;
|
|
|
|
table = kmemdup(vrf_table, sizeof(vrf_table), GFP_KERNEL);
|
|
if (!table)
|
|
return -ENOMEM;
|
|
|
|
/* init the extra1 parameter with the reference to current netns */
|
|
table[0].extra1 = net;
|
|
|
|
nn_vrf->ctl_hdr = register_net_sysctl(net, "net/vrf", table);
|
|
if (!nn_vrf->ctl_hdr) {
|
|
kfree(table);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void vrf_netns_exit_sysctl(struct net *net)
|
|
{
|
|
struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id);
|
|
struct ctl_table *table;
|
|
|
|
table = nn_vrf->ctl_hdr->ctl_table_arg;
|
|
unregister_net_sysctl_table(nn_vrf->ctl_hdr);
|
|
kfree(table);
|
|
}
|
|
#else
|
|
static int vrf_netns_init_sysctl(struct net *net, struct netns_vrf *nn_vrf)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void vrf_netns_exit_sysctl(struct net *net)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/* Initialize per network namespace state */
|
|
static int __net_init vrf_netns_init(struct net *net)
|
|
{
|
|
struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id);
|
|
|
|
nn_vrf->add_fib_rules = true;
|
|
vrf_map_init(&nn_vrf->vmap);
|
|
|
|
return vrf_netns_init_sysctl(net, nn_vrf);
|
|
}
|
|
|
|
static void __net_exit vrf_netns_exit(struct net *net)
|
|
{
|
|
vrf_netns_exit_sysctl(net);
|
|
}
|
|
|
|
static struct pernet_operations vrf_net_ops __net_initdata = {
|
|
.init = vrf_netns_init,
|
|
.exit = vrf_netns_exit,
|
|
.id = &vrf_net_id,
|
|
.size = sizeof(struct netns_vrf),
|
|
};
|
|
|
|
static int __init vrf_init_module(void)
|
|
{
|
|
int rc;
|
|
|
|
register_netdevice_notifier(&vrf_notifier_block);
|
|
|
|
rc = register_pernet_subsys(&vrf_net_ops);
|
|
if (rc < 0)
|
|
goto error;
|
|
|
|
rc = l3mdev_table_lookup_register(L3MDEV_TYPE_VRF,
|
|
vrf_ifindex_lookup_by_table_id);
|
|
if (rc < 0)
|
|
goto unreg_pernet;
|
|
|
|
rc = rtnl_link_register(&vrf_link_ops);
|
|
if (rc < 0)
|
|
goto table_lookup_unreg;
|
|
|
|
return 0;
|
|
|
|
table_lookup_unreg:
|
|
l3mdev_table_lookup_unregister(L3MDEV_TYPE_VRF,
|
|
vrf_ifindex_lookup_by_table_id);
|
|
|
|
unreg_pernet:
|
|
unregister_pernet_subsys(&vrf_net_ops);
|
|
|
|
error:
|
|
unregister_netdevice_notifier(&vrf_notifier_block);
|
|
return rc;
|
|
}
|
|
|
|
module_init(vrf_init_module);
|
|
MODULE_AUTHOR("Shrijeet Mukherjee, David Ahern");
|
|
MODULE_DESCRIPTION("Device driver to instantiate VRF domains");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_RTNL_LINK(DRV_NAME);
|
|
MODULE_VERSION(DRV_VERSION);
|