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2052 lines
46 KiB
2052 lines
46 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* vrf.c: device driver to encapsulate a VRF space |
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* |
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* Copyright (c) 2015 Cumulus Networks. All rights reserved. |
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* Copyright (c) 2015 Shrijeet Mukherjee <[email protected]> |
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* Copyright (c) 2015 David Ahern <[email protected]> |
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* |
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* Based on dummy, team and ipvlan drivers |
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*/ |
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|
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#include <linux/ethtool.h> |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/netdevice.h> |
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#include <linux/etherdevice.h> |
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#include <linux/ip.h> |
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#include <linux/init.h> |
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#include <linux/moduleparam.h> |
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#include <linux/netfilter.h> |
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#include <linux/rtnetlink.h> |
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#include <net/rtnetlink.h> |
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#include <linux/u64_stats_sync.h> |
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#include <linux/hashtable.h> |
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#include <linux/spinlock_types.h> |
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|
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#include <linux/inetdevice.h> |
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#include <net/arp.h> |
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#include <net/ip.h> |
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#include <net/ip_fib.h> |
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#include <net/ip6_fib.h> |
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#include <net/ip6_route.h> |
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#include <net/route.h> |
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#include <net/addrconf.h> |
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#include <net/l3mdev.h> |
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#include <net/fib_rules.h> |
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#include <net/netns/generic.h> |
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|
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#define DRV_NAME "vrf" |
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#define DRV_VERSION "1.1" |
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|
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#define FIB_RULE_PREF 1000 /* default preference for FIB rules */ |
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|
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#define HT_MAP_BITS 4 |
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#define HASH_INITVAL ((u32)0xcafef00d) |
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|
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struct vrf_map { |
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DECLARE_HASHTABLE(ht, HT_MAP_BITS); |
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spinlock_t vmap_lock; |
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|
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/* shared_tables: |
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* count how many distinct tables do not comply with the strict mode |
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* requirement. |
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* shared_tables value must be 0 in order to enable the strict mode. |
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* |
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* example of the evolution of shared_tables: |
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* | time |
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* add vrf0 --> table 100 shared_tables = 0 | t0 |
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* add vrf1 --> table 101 shared_tables = 0 | t1 |
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* add vrf2 --> table 100 shared_tables = 1 | t2 |
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* add vrf3 --> table 100 shared_tables = 1 | t3 |
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* add vrf4 --> table 101 shared_tables = 2 v t4 |
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* |
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* shared_tables is a "step function" (or "staircase function") |
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* and it is increased by one when the second vrf is associated to a |
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* table. |
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* |
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* at t2, vrf0 and vrf2 are bound to table 100: shared_tables = 1. |
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* |
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* at t3, another dev (vrf3) is bound to the same table 100 but the |
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* value of shared_tables is still 1. |
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* This means that no matter how many new vrfs will register on the |
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* table 100, the shared_tables will not increase (considering only |
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* table 100). |
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* |
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* at t4, vrf4 is bound to table 101, and shared_tables = 2. |
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* |
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* Looking at the value of shared_tables we can immediately know if |
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* the strict_mode can or cannot be enforced. Indeed, strict_mode |
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* can be enforced iff shared_tables = 0. |
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* |
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* Conversely, shared_tables is decreased when a vrf is de-associated |
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* from a table with exactly two associated vrfs. |
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*/ |
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u32 shared_tables; |
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|
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bool strict_mode; |
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}; |
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|
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struct vrf_map_elem { |
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struct hlist_node hnode; |
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struct list_head vrf_list; /* VRFs registered to this table */ |
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|
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u32 table_id; |
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int users; |
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int ifindex; |
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}; |
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|
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static unsigned int vrf_net_id; |
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|
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/* per netns vrf data */ |
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struct netns_vrf { |
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/* protected by rtnl lock */ |
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bool add_fib_rules; |
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|
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struct vrf_map vmap; |
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struct ctl_table_header *ctl_hdr; |
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}; |
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|
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struct net_vrf { |
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struct rtable __rcu *rth; |
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struct rt6_info __rcu *rt6; |
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#if IS_ENABLED(CONFIG_IPV6) |
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struct fib6_table *fib6_table; |
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#endif |
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u32 tb_id; |
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|
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struct list_head me_list; /* entry in vrf_map_elem */ |
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int ifindex; |
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}; |
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|
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struct pcpu_dstats { |
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u64 tx_pkts; |
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u64 tx_bytes; |
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u64 tx_drps; |
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u64 rx_pkts; |
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u64 rx_bytes; |
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u64 rx_drps; |
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struct u64_stats_sync syncp; |
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}; |
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|
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static void vrf_rx_stats(struct net_device *dev, int len) |
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{ |
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struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); |
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|
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u64_stats_update_begin(&dstats->syncp); |
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dstats->rx_pkts++; |
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dstats->rx_bytes += len; |
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u64_stats_update_end(&dstats->syncp); |
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} |
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|
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static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb) |
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{ |
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vrf_dev->stats.tx_errors++; |
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kfree_skb(skb); |
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} |
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|
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static void vrf_get_stats64(struct net_device *dev, |
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struct rtnl_link_stats64 *stats) |
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{ |
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int i; |
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|
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for_each_possible_cpu(i) { |
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const struct pcpu_dstats *dstats; |
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u64 tbytes, tpkts, tdrops, rbytes, rpkts; |
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unsigned int start; |
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|
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dstats = per_cpu_ptr(dev->dstats, i); |
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do { |
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start = u64_stats_fetch_begin_irq(&dstats->syncp); |
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tbytes = dstats->tx_bytes; |
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tpkts = dstats->tx_pkts; |
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tdrops = dstats->tx_drps; |
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rbytes = dstats->rx_bytes; |
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rpkts = dstats->rx_pkts; |
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} while (u64_stats_fetch_retry_irq(&dstats->syncp, start)); |
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stats->tx_bytes += tbytes; |
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stats->tx_packets += tpkts; |
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stats->tx_dropped += tdrops; |
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stats->rx_bytes += rbytes; |
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stats->rx_packets += rpkts; |
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} |
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} |
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|
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static struct vrf_map *netns_vrf_map(struct net *net) |
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{ |
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struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id); |
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|
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return &nn_vrf->vmap; |
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} |
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|
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static struct vrf_map *netns_vrf_map_by_dev(struct net_device *dev) |
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{ |
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return netns_vrf_map(dev_net(dev)); |
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} |
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|
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static int vrf_map_elem_get_vrf_ifindex(struct vrf_map_elem *me) |
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{ |
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struct list_head *me_head = &me->vrf_list; |
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struct net_vrf *vrf; |
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|
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if (list_empty(me_head)) |
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return -ENODEV; |
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vrf = list_first_entry(me_head, struct net_vrf, me_list); |
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|
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return vrf->ifindex; |
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} |
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|
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static struct vrf_map_elem *vrf_map_elem_alloc(gfp_t flags) |
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{ |
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struct vrf_map_elem *me; |
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|
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me = kmalloc(sizeof(*me), flags); |
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if (!me) |
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return NULL; |
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|
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return me; |
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} |
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|
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static void vrf_map_elem_free(struct vrf_map_elem *me) |
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{ |
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kfree(me); |
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} |
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|
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static void vrf_map_elem_init(struct vrf_map_elem *me, int table_id, |
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int ifindex, int users) |
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{ |
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me->table_id = table_id; |
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me->ifindex = ifindex; |
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me->users = users; |
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INIT_LIST_HEAD(&me->vrf_list); |
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} |
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|
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static struct vrf_map_elem *vrf_map_lookup_elem(struct vrf_map *vmap, |
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u32 table_id) |
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{ |
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struct vrf_map_elem *me; |
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u32 key; |
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|
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key = jhash_1word(table_id, HASH_INITVAL); |
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hash_for_each_possible(vmap->ht, me, hnode, key) { |
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if (me->table_id == table_id) |
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return me; |
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} |
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|
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return NULL; |
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} |
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|
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static void vrf_map_add_elem(struct vrf_map *vmap, struct vrf_map_elem *me) |
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{ |
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u32 table_id = me->table_id; |
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u32 key; |
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|
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key = jhash_1word(table_id, HASH_INITVAL); |
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hash_add(vmap->ht, &me->hnode, key); |
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} |
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|
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static void vrf_map_del_elem(struct vrf_map_elem *me) |
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{ |
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hash_del(&me->hnode); |
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} |
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static void vrf_map_lock(struct vrf_map *vmap) __acquires(&vmap->vmap_lock) |
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{ |
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spin_lock(&vmap->vmap_lock); |
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} |
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|
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static void vrf_map_unlock(struct vrf_map *vmap) __releases(&vmap->vmap_lock) |
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{ |
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spin_unlock(&vmap->vmap_lock); |
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} |
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|
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/* called with rtnl lock held */ |
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static int |
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vrf_map_register_dev(struct net_device *dev, struct netlink_ext_ack *extack) |
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{ |
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struct vrf_map *vmap = netns_vrf_map_by_dev(dev); |
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struct net_vrf *vrf = netdev_priv(dev); |
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struct vrf_map_elem *new_me, *me; |
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u32 table_id = vrf->tb_id; |
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bool free_new_me = false; |
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int users; |
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int res; |
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|
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/* we pre-allocate elements used in the spin-locked section (so that we |
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* keep the spinlock as short as possibile). |
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*/ |
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new_me = vrf_map_elem_alloc(GFP_KERNEL); |
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if (!new_me) |
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return -ENOMEM; |
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vrf_map_elem_init(new_me, table_id, dev->ifindex, 0); |
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vrf_map_lock(vmap); |
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me = vrf_map_lookup_elem(vmap, table_id); |
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if (!me) { |
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me = new_me; |
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vrf_map_add_elem(vmap, me); |
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goto link_vrf; |
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} |
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|
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/* we already have an entry in the vrf_map, so it means there is (at |
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* least) a vrf registered on the specific table. |
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*/ |
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free_new_me = true; |
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if (vmap->strict_mode) { |
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/* vrfs cannot share the same table */ |
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NL_SET_ERR_MSG(extack, "Table is used by another VRF"); |
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res = -EBUSY; |
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goto unlock; |
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} |
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link_vrf: |
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users = ++me->users; |
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if (users == 2) |
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++vmap->shared_tables; |
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list_add(&vrf->me_list, &me->vrf_list); |
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res = 0; |
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unlock: |
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vrf_map_unlock(vmap); |
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|
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/* clean-up, if needed */ |
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if (free_new_me) |
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vrf_map_elem_free(new_me); |
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return res; |
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} |
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|
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/* called with rtnl lock held */ |
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static void vrf_map_unregister_dev(struct net_device *dev) |
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{ |
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struct vrf_map *vmap = netns_vrf_map_by_dev(dev); |
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struct net_vrf *vrf = netdev_priv(dev); |
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u32 table_id = vrf->tb_id; |
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struct vrf_map_elem *me; |
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int users; |
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vrf_map_lock(vmap); |
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me = vrf_map_lookup_elem(vmap, table_id); |
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if (!me) |
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goto unlock; |
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list_del(&vrf->me_list); |
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users = --me->users; |
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if (users == 1) { |
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--vmap->shared_tables; |
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} else if (users == 0) { |
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vrf_map_del_elem(me); |
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|
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/* no one will refer to this element anymore */ |
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vrf_map_elem_free(me); |
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} |
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unlock: |
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vrf_map_unlock(vmap); |
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} |
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|
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/* return the vrf device index associated with the table_id */ |
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static int vrf_ifindex_lookup_by_table_id(struct net *net, u32 table_id) |
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{ |
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struct vrf_map *vmap = netns_vrf_map(net); |
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struct vrf_map_elem *me; |
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int ifindex; |
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|
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vrf_map_lock(vmap); |
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|
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if (!vmap->strict_mode) { |
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ifindex = -EPERM; |
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goto unlock; |
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} |
|
|
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me = vrf_map_lookup_elem(vmap, table_id); |
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if (!me) { |
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ifindex = -ENODEV; |
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goto unlock; |
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} |
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|
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ifindex = vrf_map_elem_get_vrf_ifindex(me); |
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|
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unlock: |
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vrf_map_unlock(vmap); |
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|
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return ifindex; |
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} |
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|
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/* by default VRF devices do not have a qdisc and are expected |
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* to be created with only a single queue. |
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*/ |
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static bool qdisc_tx_is_default(const struct net_device *dev) |
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{ |
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struct netdev_queue *txq; |
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struct Qdisc *qdisc; |
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|
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if (dev->num_tx_queues > 1) |
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return false; |
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|
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txq = netdev_get_tx_queue(dev, 0); |
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qdisc = rcu_access_pointer(txq->qdisc); |
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|
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return !qdisc->enqueue; |
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} |
|
|
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/* Local traffic destined to local address. Reinsert the packet to rx |
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* path, similar to loopback handling. |
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*/ |
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static int vrf_local_xmit(struct sk_buff *skb, struct net_device *dev, |
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struct dst_entry *dst) |
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{ |
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int len = skb->len; |
|
|
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skb_orphan(skb); |
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|
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skb_dst_set(skb, dst); |
|
|
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/* set pkt_type to avoid skb hitting packet taps twice - |
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* once on Tx and again in Rx processing |
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*/ |
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skb->pkt_type = PACKET_LOOPBACK; |
|
|
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skb->protocol = eth_type_trans(skb, dev); |
|
|
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if (likely(netif_rx(skb) == NET_RX_SUCCESS)) |
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vrf_rx_stats(dev, len); |
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else |
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this_cpu_inc(dev->dstats->rx_drps); |
|
|
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return NETDEV_TX_OK; |
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} |
|
|
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#if IS_ENABLED(CONFIG_IPV6) |
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static int vrf_ip6_local_out(struct net *net, struct sock *sk, |
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struct sk_buff *skb) |
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{ |
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int err; |
|
|
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err = nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, |
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sk, skb, NULL, skb_dst(skb)->dev, dst_output); |
|
|
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if (likely(err == 1)) |
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err = dst_output(net, sk, skb); |
|
|
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return err; |
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} |
|
|
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static netdev_tx_t vrf_process_v6_outbound(struct sk_buff *skb, |
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struct net_device *dev) |
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{ |
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const struct ipv6hdr *iph; |
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struct net *net = dev_net(skb->dev); |
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struct flowi6 fl6; |
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int ret = NET_XMIT_DROP; |
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struct dst_entry *dst; |
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struct dst_entry *dst_null = &net->ipv6.ip6_null_entry->dst; |
|
|
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if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr))) |
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goto err; |
|
|
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iph = ipv6_hdr(skb); |
|
|
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memset(&fl6, 0, sizeof(fl6)); |
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/* needed to match OIF rule */ |
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fl6.flowi6_oif = dev->ifindex; |
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fl6.flowi6_iif = LOOPBACK_IFINDEX; |
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fl6.daddr = iph->daddr; |
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fl6.saddr = iph->saddr; |
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fl6.flowlabel = ip6_flowinfo(iph); |
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fl6.flowi6_mark = skb->mark; |
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fl6.flowi6_proto = iph->nexthdr; |
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fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF; |
|
|
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dst = ip6_dst_lookup_flow(net, NULL, &fl6, NULL); |
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if (IS_ERR(dst) || dst == dst_null) |
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goto err; |
|
|
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skb_dst_drop(skb); |
|
|
|
/* if dst.dev is the VRF device again this is locally originated traffic |
|
* destined to a local address. Short circuit to Rx path. |
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*/ |
|
if (dst->dev == dev) |
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return vrf_local_xmit(skb, dev, dst); |
|
|
|
skb_dst_set(skb, dst); |
|
|
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/* 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 |
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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 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);
|
|
|