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- // 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/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>
- #include <net/netfilter/nf_conntrack.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;
- }
- static void vrf_nf_set_untracked(struct sk_buff *skb)
- {
- if (skb_get_nfct(skb) == 0)
- nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
- }
- static void vrf_nf_reset_ct(struct sk_buff *skb)
- {
- if (skb_get_nfct(skb) == IP_CT_UNTRACKED)
- nf_reset_ct(skb);
- }
- #if IS_ENABLED(CONFIG_IPV6)
- static int vrf_ip6_local_out(struct net *net, struct sock *sk,
- struct sk_buff *skb)
- {
- int err;
- vrf_nf_reset_ct(skb);
- 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));
- memset(IP6CB(skb), 0, sizeof(*IP6CB(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;
- vrf_nf_reset_ct(skb);
- 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);
- }
- memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
- 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);
- }
- vrf_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;
- vrf_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;
- vrf_nf_set_untracked(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;
- vrf_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;
- vrf_nf_set_untracked(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;
- /* 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;
- }
- #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);
- /* loopback, multicast & non-ND link-local traffic; do not push through
- * packet taps again. Reset pkt_type for upper layers to process skb.
- * For strict packets with a source LLA, determine the dst using the
- * original ifindex.
- */
- if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) {
- 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;
- else if (ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)
- vrf_ip6_input_dst(skb, vrf_dev, orig_iif);
- 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)) {
- 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)) {
- 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 = IP6_MAX_MTU;
- dev->mtu = dev->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);
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