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![Nikolay Aleksandrov](/assets/img/avatar_default.png)
When vrf's ->newlink is called, if register_netdevice() fails then it
does free_netdev(), but that's also done by rtnl_newlink() so a second
free happens and memory gets corrupted, to reproduce execute the
following line a couple of times (1 - 5 usually is enough):
$ for i in `seq 1 5`; do ip link add vrf: type vrf table 1; done;
This works because we fail in register_netdevice() because of the wrong
name "vrf:".
And here's a trace of one crash:
[ 28.792157] ------------[ cut here ]------------
[ 28.792407] kernel BUG at fs/namei.c:246!
[ 28.792608] invalid opcode: 0000 [#1] SMP
[ 28.793240] Modules linked in: vrf nfsd auth_rpcgss oid_registry
nfs_acl nfs lockd grace sunrpc crct10dif_pclmul crc32_pclmul
crc32c_intel qxl drm_kms_helper ttm drm aesni_intel aes_x86_64 psmouse
glue_helper lrw evdev gf128mul i2c_piix4 ablk_helper cryptd ppdev
parport_pc parport serio_raw pcspkr virtio_balloon virtio_console
i2c_core acpi_cpufreq button 9pnet_virtio 9p 9pnet fscache ipv6 autofs4
ext4 crc16 mbcache jbd2 virtio_blk virtio_net sg sr_mod cdrom
ata_generic ehci_pci uhci_hcd ehci_hcd e1000 usbcore usb_common ata_piix
libata virtio_pci virtio_ring virtio scsi_mod floppy
[ 28.796016] CPU: 0 PID: 1148 Comm: ld-linux-x86-64 Not tainted
4.4.0-rc1+ #24
[ 28.796016] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.8.1-20150318_183358- 04/01/2014
[ 28.796016] task: ffff8800352561c0 ti: ffff88003592c000 task.ti:
ffff88003592c000
[ 28.796016] RIP: 0010:[<ffffffff812187b3>] [<ffffffff812187b3>]
putname+0x43/0x60
[ 28.796016] RSP: 0018:ffff88003592fe88 EFLAGS: 00010246
[ 28.796016] RAX: 0000000000000000 RBX: ffff8800352561c0 RCX:
0000000000000001
[ 28.796016] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
ffff88003784f000
[ 28.796016] RBP: ffff88003592ff08 R08: 0000000000000001 R09:
0000000000000000
[ 28.796016] R10: 0000000000000000 R11: 0000000000000001 R12:
0000000000000000
[ 28.796016] R13: 000000000000047c R14: ffff88003784f000 R15:
ffff8800358c4a00
[ 28.796016] FS: 0000000000000000(0000) GS:ffff88003fc00000(0000)
knlGS:0000000000000000
[ 28.796016] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 28.796016] CR2: 00007ffd583bc2d9 CR3: 0000000035a99000 CR4:
00000000000406f0
[ 28.796016] Stack:
[ 28.796016] ffffffff8121045d ffffffff812102d3 ffff8800352561c0
ffff880035a91660
[ 28.796016] ffff8800008a9880 0000000000000000 ffffffff81a49940
00ffffff81218684
[ 28.796016] ffff8800352561c0 000000000000047c 0000000000000000
ffff880035b36d80
[ 28.796016] Call Trace:
[ 28.796016] [<ffffffff8121045d>] ?
do_execveat_common.isra.34+0x74d/0x930
[ 28.796016] [<ffffffff812102d3>] ?
do_execveat_common.isra.34+0x5c3/0x930
[ 28.796016] [<ffffffff8121066c>] do_execve+0x2c/0x30
[ 28.796016] [<ffffffff810939a0>]
call_usermodehelper_exec_async+0xf0/0x140
[ 28.796016] [<ffffffff810938b0>] ? umh_complete+0x40/0x40
[ 28.796016] [<ffffffff815cb1af>] ret_from_fork+0x3f/0x70
[ 28.796016] Code: 48 8d 47 1c 48 89 e5 53 48 8b 37 48 89 fb 48 39 c6
74 1a 48 8b 3d 7e e9 8f 00 e8 49 fa fc ff 48 89 df e8 f1 01 fd ff 5b 5d
f3 c3 <0f> 0b 48 89 fe 48 8b 3d 61 e9 8f 00 e8 2c fa fc ff 5b 5d eb e9
[ 28.796016] RIP [<ffffffff812187b3>] putname+0x43/0x60
[ 28.796016] RSP <ffff88003592fe88>
Fixes: 193125dbd8
("net: Introduce VRF device driver")
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Acked-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1023 lines
23 KiB
C
1023 lines
23 KiB
C
/*
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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 <shm@cumulusnetworks.com>
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* Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
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*
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* Based on dummy, team and ipvlan drivers
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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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/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/rtnetlink.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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#define RT_FL_TOS(oldflp4) \
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((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK))
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#define DRV_NAME "vrf"
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#define DRV_VERSION "1.0"
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#define vrf_master_get_rcu(dev) \
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((struct net_device *)rcu_dereference(dev->rx_handler_data))
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struct slave {
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struct list_head list;
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struct net_device *dev;
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};
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struct slave_queue {
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struct list_head all_slaves;
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};
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struct net_vrf {
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struct slave_queue queue;
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struct rtable *rth;
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struct rt6_info *rt6;
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u32 tb_id;
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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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struct u64_stats_sync syncp;
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};
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static struct dst_entry *vrf_ip_check(struct dst_entry *dst, u32 cookie)
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{
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return dst;
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}
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static int vrf_ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
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{
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return ip_local_out(net, sk, skb);
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}
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static unsigned int vrf_v4_mtu(const struct dst_entry *dst)
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{
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/* TO-DO: return max ethernet size? */
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return dst->dev->mtu;
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}
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static void vrf_dst_destroy(struct dst_entry *dst)
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{
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/* our dst lives forever - or until the device is closed */
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}
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static unsigned int vrf_default_advmss(const struct dst_entry *dst)
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{
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return 65535 - 40;
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}
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static struct dst_ops vrf_dst_ops = {
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.family = AF_INET,
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.local_out = vrf_ip_local_out,
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.check = vrf_ip_check,
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.mtu = vrf_v4_mtu,
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.destroy = vrf_dst_destroy,
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.default_advmss = vrf_default_advmss,
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};
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/* neighbor handling is done with actual device; do not want
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* to flip skb->dev for those ndisc packets. This really fails
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* for multiple next protocols (e.g., NEXTHDR_HOP). But it is
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* a start.
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*/
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#if IS_ENABLED(CONFIG_IPV6)
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static bool check_ipv6_frame(const struct sk_buff *skb)
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{
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const struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb->data;
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size_t hlen = sizeof(*ipv6h);
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bool rc = true;
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if (skb->len < hlen)
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goto out;
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if (ipv6h->nexthdr == NEXTHDR_ICMP) {
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const struct icmp6hdr *icmph;
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if (skb->len < hlen + sizeof(*icmph))
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goto out;
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icmph = (struct icmp6hdr *)(skb->data + sizeof(*ipv6h));
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switch (icmph->icmp6_type) {
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case NDISC_ROUTER_SOLICITATION:
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case NDISC_ROUTER_ADVERTISEMENT:
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case NDISC_NEIGHBOUR_SOLICITATION:
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case NDISC_NEIGHBOUR_ADVERTISEMENT:
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case NDISC_REDIRECT:
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rc = false;
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break;
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}
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}
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out:
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return rc;
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}
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#else
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static bool check_ipv6_frame(const struct sk_buff *skb)
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{
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return false;
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}
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#endif
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static bool is_ip_rx_frame(struct sk_buff *skb)
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{
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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return true;
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case htons(ETH_P_IPV6):
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return check_ipv6_frame(skb);
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}
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return false;
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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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/* note: already called with rcu_read_lock */
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static rx_handler_result_t vrf_handle_frame(struct sk_buff **pskb)
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{
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struct sk_buff *skb = *pskb;
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if (is_ip_rx_frame(skb)) {
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struct net_device *dev = vrf_master_get_rcu(skb->dev);
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struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
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u64_stats_update_begin(&dstats->syncp);
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dstats->rx_pkts++;
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dstats->rx_bytes += skb->len;
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u64_stats_update_end(&dstats->syncp);
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skb->dev = dev;
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return RX_HANDLER_ANOTHER;
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}
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return RX_HANDLER_PASS;
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}
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static struct rtnl_link_stats64 *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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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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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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return stats;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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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 = ipv6_hdr(skb);
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struct net *net = dev_net(skb->dev);
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struct flowi6 fl6 = {
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/* needed to match OIF rule */
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.flowi6_oif = dev->ifindex,
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.flowi6_iif = LOOPBACK_IFINDEX,
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.daddr = iph->daddr,
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.saddr = iph->saddr,
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.flowlabel = ip6_flowinfo(iph),
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.flowi6_mark = skb->mark,
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.flowi6_proto = iph->nexthdr,
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.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | FLOWI_FLAG_SKIP_NH_OIF,
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};
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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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dst = ip6_route_output(net, NULL, &fl6);
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if (dst == dst_null)
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goto err;
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skb_dst_drop(skb);
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skb_dst_set(skb, dst);
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ret = ip6_local_out(net, skb->sk, skb);
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if (unlikely(net_xmit_eval(ret)))
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dev->stats.tx_errors++;
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else
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ret = NET_XMIT_SUCCESS;
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return ret;
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err:
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vrf_tx_error(dev, skb);
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return NET_XMIT_DROP;
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}
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#else
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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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vrf_tx_error(dev, skb);
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return NET_XMIT_DROP;
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}
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#endif
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static int vrf_send_v4_prep(struct sk_buff *skb, struct flowi4 *fl4,
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struct net_device *vrf_dev)
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{
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struct rtable *rt;
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int err = 1;
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rt = ip_route_output_flow(dev_net(vrf_dev), fl4, NULL);
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if (IS_ERR(rt))
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goto out;
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/* TO-DO: what about broadcast ? */
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if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
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ip_rt_put(rt);
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goto out;
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}
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skb_dst_drop(skb);
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skb_dst_set(skb, &rt->dst);
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err = 0;
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out:
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return err;
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}
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static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
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struct net_device *vrf_dev)
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{
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struct iphdr *ip4h = ip_hdr(skb);
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int ret = NET_XMIT_DROP;
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struct flowi4 fl4 = {
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/* needed to match OIF rule */
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.flowi4_oif = vrf_dev->ifindex,
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.flowi4_iif = LOOPBACK_IFINDEX,
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.flowi4_tos = RT_TOS(ip4h->tos),
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.flowi4_flags = FLOWI_FLAG_ANYSRC | FLOWI_FLAG_L3MDEV_SRC |
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FLOWI_FLAG_SKIP_NH_OIF,
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.daddr = ip4h->daddr,
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};
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if (vrf_send_v4_prep(skb, &fl4, vrf_dev))
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goto err;
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if (!ip4h->saddr) {
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ip4h->saddr = inet_select_addr(skb_dst(skb)->dev, 0,
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RT_SCOPE_LINK);
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}
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ret = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
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if (unlikely(net_xmit_eval(ret)))
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vrf_dev->stats.tx_errors++;
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else
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ret = NET_XMIT_SUCCESS;
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out:
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return ret;
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err:
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vrf_tx_error(vrf_dev, skb);
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goto out;
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}
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static netdev_tx_t is_ip_tx_frame(struct sk_buff *skb, struct net_device *dev)
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{
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/* strip the ethernet header added for pass through VRF device */
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__skb_pull(skb, skb_network_offset(skb));
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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return vrf_process_v4_outbound(skb, dev);
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case htons(ETH_P_IPV6):
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return vrf_process_v6_outbound(skb, dev);
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default:
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vrf_tx_error(dev, skb);
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return NET_XMIT_DROP;
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}
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}
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static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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netdev_tx_t ret = is_ip_tx_frame(skb, dev);
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|
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if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
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struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
|
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u64_stats_update_begin(&dstats->syncp);
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dstats->tx_pkts++;
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dstats->tx_bytes += skb->len;
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u64_stats_update_end(&dstats->syncp);
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} else {
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this_cpu_inc(dev->dstats->tx_drps);
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}
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return ret;
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}
|
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|
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#if IS_ENABLED(CONFIG_IPV6)
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static struct dst_entry *vrf_ip6_check(struct dst_entry *dst, u32 cookie)
|
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{
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return dst;
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}
|
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|
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static struct dst_ops vrf_dst_ops6 = {
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.family = AF_INET6,
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.local_out = ip6_local_out,
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.check = vrf_ip6_check,
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.mtu = vrf_v4_mtu,
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.destroy = vrf_dst_destroy,
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.default_advmss = vrf_default_advmss,
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};
|
|
|
|
static int init_dst_ops6_kmem_cachep(void)
|
|
{
|
|
vrf_dst_ops6.kmem_cachep = kmem_cache_create("vrf_ip6_dst_cache",
|
|
sizeof(struct rt6_info),
|
|
0,
|
|
SLAB_HWCACHE_ALIGN,
|
|
NULL);
|
|
|
|
if (!vrf_dst_ops6.kmem_cachep)
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|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void free_dst_ops6_kmem_cachep(void)
|
|
{
|
|
kmem_cache_destroy(vrf_dst_ops6.kmem_cachep);
|
|
}
|
|
|
|
static int vrf_input6(struct sk_buff *skb)
|
|
{
|
|
skb->dev->stats.rx_errors++;
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
/* 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;
|
|
struct neighbour *neigh;
|
|
struct in6_addr *nexthop;
|
|
int ret;
|
|
|
|
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)) {
|
|
ret = dst_neigh_output(dst, neigh, skb);
|
|
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));
|
|
}
|
|
|
|
static void vrf_rt6_destroy(struct net_vrf *vrf)
|
|
{
|
|
dst_destroy(&vrf->rt6->dst);
|
|
free_percpu(vrf->rt6->rt6i_pcpu);
|
|
vrf->rt6 = NULL;
|
|
}
|
|
|
|
static int vrf_rt6_create(struct net_device *dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
struct dst_entry *dst;
|
|
struct rt6_info *rt6;
|
|
int cpu;
|
|
int rc = -ENOMEM;
|
|
|
|
rt6 = dst_alloc(&vrf_dst_ops6, dev, 0,
|
|
DST_OBSOLETE_NONE,
|
|
(DST_HOST | DST_NOPOLICY | DST_NOXFRM));
|
|
if (!rt6)
|
|
goto out;
|
|
|
|
dst = &rt6->dst;
|
|
|
|
rt6->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_KERNEL);
|
|
if (!rt6->rt6i_pcpu) {
|
|
dst_destroy(dst);
|
|
goto out;
|
|
}
|
|
for_each_possible_cpu(cpu) {
|
|
struct rt6_info **p = per_cpu_ptr(rt6->rt6i_pcpu, cpu);
|
|
*p = NULL;
|
|
}
|
|
|
|
memset(dst + 1, 0, sizeof(*rt6) - sizeof(*dst));
|
|
|
|
INIT_LIST_HEAD(&rt6->rt6i_siblings);
|
|
INIT_LIST_HEAD(&rt6->rt6i_uncached);
|
|
|
|
rt6->dst.input = vrf_input6;
|
|
rt6->dst.output = vrf_output6;
|
|
|
|
rt6->rt6i_table = fib6_get_table(dev_net(dev), vrf->tb_id);
|
|
|
|
atomic_set(&rt6->dst.__refcnt, 2);
|
|
|
|
vrf->rt6 = rt6;
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
}
|
|
#else
|
|
static int init_dst_ops6_kmem_cachep(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void free_dst_ops6_kmem_cachep(void)
|
|
{
|
|
}
|
|
|
|
static void vrf_rt6_destroy(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;
|
|
u32 nexthop;
|
|
int ret = -EINVAL;
|
|
|
|
/* 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();
|
|
|
|
nexthop = (__force u32)rt_nexthop(rt, ip_hdr(skb)->daddr);
|
|
neigh = __ipv4_neigh_lookup_noref(dev, nexthop);
|
|
if (unlikely(!neigh))
|
|
neigh = __neigh_create(&arp_tbl, &nexthop, dev, false);
|
|
if (!IS_ERR(neigh))
|
|
ret = dst_neigh_output(dst, neigh, skb);
|
|
|
|
rcu_read_unlock_bh();
|
|
err:
|
|
if (unlikely(ret < 0))
|
|
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));
|
|
}
|
|
|
|
static void vrf_rtable_destroy(struct net_vrf *vrf)
|
|
{
|
|
struct dst_entry *dst = (struct dst_entry *)vrf->rth;
|
|
|
|
dst_destroy(dst);
|
|
vrf->rth = NULL;
|
|
}
|
|
|
|
static struct rtable *vrf_rtable_create(struct net_device *dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
struct rtable *rth;
|
|
|
|
rth = dst_alloc(&vrf_dst_ops, dev, 2,
|
|
DST_OBSOLETE_NONE,
|
|
(DST_HOST | DST_NOPOLICY | DST_NOXFRM));
|
|
if (rth) {
|
|
rth->dst.output = vrf_output;
|
|
rth->rt_genid = rt_genid_ipv4(dev_net(dev));
|
|
rth->rt_flags = 0;
|
|
rth->rt_type = RTN_UNICAST;
|
|
rth->rt_is_input = 0;
|
|
rth->rt_iif = 0;
|
|
rth->rt_pmtu = 0;
|
|
rth->rt_gateway = 0;
|
|
rth->rt_uses_gateway = 0;
|
|
rth->rt_table_id = vrf->tb_id;
|
|
INIT_LIST_HEAD(&rth->rt_uncached);
|
|
rth->rt_uncached_list = NULL;
|
|
}
|
|
|
|
return rth;
|
|
}
|
|
|
|
/**************************** device handling ********************/
|
|
|
|
/* cycle interface to flush neighbor cache and move routes across tables */
|
|
static void cycle_netdev(struct net_device *dev)
|
|
{
|
|
unsigned int flags = dev->flags;
|
|
int ret;
|
|
|
|
if (!netif_running(dev))
|
|
return;
|
|
|
|
ret = dev_change_flags(dev, flags & ~IFF_UP);
|
|
if (ret >= 0)
|
|
ret = dev_change_flags(dev, flags);
|
|
|
|
if (ret < 0) {
|
|
netdev_err(dev,
|
|
"Failed to cycle device %s; route tables might be wrong!\n",
|
|
dev->name);
|
|
}
|
|
}
|
|
|
|
static struct slave *__vrf_find_slave_dev(struct slave_queue *queue,
|
|
struct net_device *dev)
|
|
{
|
|
struct list_head *head = &queue->all_slaves;
|
|
struct slave *slave;
|
|
|
|
list_for_each_entry(slave, head, list) {
|
|
if (slave->dev == dev)
|
|
return slave;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* inverse of __vrf_insert_slave */
|
|
static void __vrf_remove_slave(struct slave_queue *queue, struct slave *slave)
|
|
{
|
|
list_del(&slave->list);
|
|
}
|
|
|
|
static void __vrf_insert_slave(struct slave_queue *queue, struct slave *slave)
|
|
{
|
|
list_add(&slave->list, &queue->all_slaves);
|
|
}
|
|
|
|
static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
|
|
{
|
|
struct slave *slave = kzalloc(sizeof(*slave), GFP_KERNEL);
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
struct slave_queue *queue = &vrf->queue;
|
|
int ret = -ENOMEM;
|
|
|
|
if (!slave)
|
|
goto out_fail;
|
|
|
|
slave->dev = port_dev;
|
|
|
|
/* register the packet handler for slave ports */
|
|
ret = netdev_rx_handler_register(port_dev, vrf_handle_frame, dev);
|
|
if (ret) {
|
|
netdev_err(port_dev,
|
|
"Device %s failed to register rx_handler\n",
|
|
port_dev->name);
|
|
goto out_fail;
|
|
}
|
|
|
|
ret = netdev_master_upper_dev_link(port_dev, dev);
|
|
if (ret < 0)
|
|
goto out_unregister;
|
|
|
|
port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
|
|
__vrf_insert_slave(queue, slave);
|
|
cycle_netdev(port_dev);
|
|
|
|
return 0;
|
|
|
|
out_unregister:
|
|
netdev_rx_handler_unregister(port_dev);
|
|
out_fail:
|
|
kfree(slave);
|
|
return ret;
|
|
}
|
|
|
|
static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
|
|
{
|
|
if (netif_is_l3_master(port_dev) || netif_is_l3_slave(port_dev))
|
|
return -EINVAL;
|
|
|
|
return do_vrf_add_slave(dev, port_dev);
|
|
}
|
|
|
|
/* inverse of do_vrf_add_slave */
|
|
static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
struct slave_queue *queue = &vrf->queue;
|
|
struct slave *slave;
|
|
|
|
netdev_upper_dev_unlink(port_dev, dev);
|
|
port_dev->priv_flags &= ~IFF_L3MDEV_SLAVE;
|
|
|
|
netdev_rx_handler_unregister(port_dev);
|
|
|
|
cycle_netdev(port_dev);
|
|
|
|
slave = __vrf_find_slave_dev(queue, port_dev);
|
|
if (slave)
|
|
__vrf_remove_slave(queue, slave);
|
|
|
|
kfree(slave);
|
|
|
|
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);
|
|
struct slave_queue *queue = &vrf->queue;
|
|
struct list_head *head = &queue->all_slaves;
|
|
struct slave *slave, *next;
|
|
|
|
vrf_rtable_destroy(vrf);
|
|
vrf_rt6_destroy(vrf);
|
|
|
|
list_for_each_entry_safe(slave, next, head, list)
|
|
vrf_del_slave(dev, slave->dev);
|
|
|
|
free_percpu(dev->dstats);
|
|
dev->dstats = NULL;
|
|
}
|
|
|
|
static int vrf_dev_init(struct net_device *dev)
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
|
|
INIT_LIST_HEAD(&vrf->queue.all_slaves);
|
|
|
|
dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
|
|
if (!dev->dstats)
|
|
goto out_nomem;
|
|
|
|
/* create the default dst which points back to us */
|
|
vrf->rth = vrf_rtable_create(dev);
|
|
if (!vrf->rth)
|
|
goto out_stats;
|
|
|
|
if (vrf_rt6_create(dev) != 0)
|
|
goto out_rth;
|
|
|
|
dev->flags = IFF_MASTER | IFF_NOARP;
|
|
|
|
return 0;
|
|
|
|
out_rth:
|
|
vrf_rtable_destroy(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_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 struct rtable *vrf_get_rtable(const struct net_device *dev,
|
|
const struct flowi4 *fl4)
|
|
{
|
|
struct rtable *rth = NULL;
|
|
|
|
if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) {
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
|
|
rth = vrf->rth;
|
|
atomic_inc(&rth->dst.__refcnt);
|
|
}
|
|
|
|
return rth;
|
|
}
|
|
|
|
/* called under rcu_read_lock */
|
|
static void vrf_get_saddr(struct net_device *dev, struct flowi4 *fl4)
|
|
{
|
|
struct fib_result res = { .tclassid = 0 };
|
|
struct net *net = dev_net(dev);
|
|
u32 orig_tos = fl4->flowi4_tos;
|
|
u8 flags = fl4->flowi4_flags;
|
|
u8 scope = fl4->flowi4_scope;
|
|
u8 tos = RT_FL_TOS(fl4);
|
|
|
|
if (unlikely(!fl4->daddr))
|
|
return;
|
|
|
|
fl4->flowi4_flags |= FLOWI_FLAG_SKIP_NH_OIF;
|
|
fl4->flowi4_iif = LOOPBACK_IFINDEX;
|
|
fl4->flowi4_tos = tos & IPTOS_RT_MASK;
|
|
fl4->flowi4_scope = ((tos & RTO_ONLINK) ?
|
|
RT_SCOPE_LINK : RT_SCOPE_UNIVERSE);
|
|
|
|
if (!fib_lookup(net, fl4, &res, 0)) {
|
|
if (res.type == RTN_LOCAL)
|
|
fl4->saddr = res.fi->fib_prefsrc ? : fl4->daddr;
|
|
else
|
|
fib_select_path(net, &res, fl4, -1);
|
|
}
|
|
|
|
fl4->flowi4_flags = flags;
|
|
fl4->flowi4_tos = orig_tos;
|
|
fl4->flowi4_scope = scope;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static struct dst_entry *vrf_get_rt6_dst(const struct net_device *dev,
|
|
const struct flowi6 *fl6)
|
|
{
|
|
struct rt6_info *rt = NULL;
|
|
|
|
if (!(fl6->flowi6_flags & FLOWI_FLAG_L3MDEV_SRC)) {
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
|
|
rt = vrf->rt6;
|
|
atomic_inc(&rt->dst.__refcnt);
|
|
}
|
|
|
|
return (struct dst_entry *)rt;
|
|
}
|
|
#endif
|
|
|
|
static const struct l3mdev_ops vrf_l3mdev_ops = {
|
|
.l3mdev_fib_table = vrf_fib_table,
|
|
.l3mdev_get_rtable = vrf_get_rtable,
|
|
.l3mdev_get_saddr = vrf_get_saddr,
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
.l3mdev_get_rt6_dst = vrf_get_rt6_dst,
|
|
#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 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->destructor = free_netdev;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
static int vrf_validate(struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
if (tb[IFLA_ADDRESS]) {
|
|
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
|
|
return -EINVAL;
|
|
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void vrf_dellink(struct net_device *dev, struct list_head *head)
|
|
{
|
|
unregister_netdevice_queue(dev, head);
|
|
}
|
|
|
|
static int vrf_newlink(struct net *src_net, struct net_device *dev,
|
|
struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
struct net_vrf *vrf = netdev_priv(dev);
|
|
|
|
if (!data || !data[IFLA_VRF_TABLE])
|
|
return -EINVAL;
|
|
|
|
vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
|
|
|
|
dev->priv_flags |= IFF_L3MDEV_MASTER;
|
|
|
|
return register_netdevice(dev);
|
|
}
|
|
|
|
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 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,
|
|
|
|
.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 __init vrf_init_module(void)
|
|
{
|
|
int rc;
|
|
|
|
vrf_dst_ops.kmem_cachep =
|
|
kmem_cache_create("vrf_ip_dst_cache",
|
|
sizeof(struct rtable), 0,
|
|
SLAB_HWCACHE_ALIGN,
|
|
NULL);
|
|
|
|
if (!vrf_dst_ops.kmem_cachep)
|
|
return -ENOMEM;
|
|
|
|
rc = init_dst_ops6_kmem_cachep();
|
|
if (rc != 0)
|
|
goto error2;
|
|
|
|
register_netdevice_notifier(&vrf_notifier_block);
|
|
|
|
rc = rtnl_link_register(&vrf_link_ops);
|
|
if (rc < 0)
|
|
goto error;
|
|
|
|
return 0;
|
|
|
|
error:
|
|
unregister_netdevice_notifier(&vrf_notifier_block);
|
|
free_dst_ops6_kmem_cachep();
|
|
error2:
|
|
kmem_cache_destroy(vrf_dst_ops.kmem_cachep);
|
|
return rc;
|
|
}
|
|
|
|
static void __exit vrf_cleanup_module(void)
|
|
{
|
|
rtnl_link_unregister(&vrf_link_ops);
|
|
unregister_netdevice_notifier(&vrf_notifier_block);
|
|
kmem_cache_destroy(vrf_dst_ops.kmem_cachep);
|
|
free_dst_ops6_kmem_cachep();
|
|
}
|
|
|
|
module_init(vrf_init_module);
|
|
module_exit(vrf_cleanup_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);
|