2019-05-27 08:55:01 +02:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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2012-07-17 11:44:54 +02:00
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/*
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* Linux NET3: IP/IP protocol decoder modified to support
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* virtual tunnel interface
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*
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* Authors:
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* Saurabh Mohan (saurabh.mohan@vyatta.com) 05/07/2012
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*/
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/*
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This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.c
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For comments look at net/ipv4/ip_gre.c --ANK
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*/
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#include <linux/capability.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/uaccess.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/in.h>
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <linux/if_arp.h>
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#include <linux/init.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/if_ether.h>
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2014-02-21 08:41:10 +01:00
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#include <linux/icmpv6.h>
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2012-07-17 11:44:54 +02:00
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#include <net/sock.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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2013-03-25 15:49:35 +01:00
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#include <net/ip_tunnels.h>
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2012-07-17 11:44:54 +02:00
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#include <net/inet_ecn.h>
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#include <net/xfrm.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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static struct rtnl_link_ops vti_link_ops __read_mostly;
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netns: make struct pernet_operations::id unsigned int
Make struct pernet_operations::id unsigned.
There are 2 reasons to do so:
1)
This field is really an index into an zero based array and
thus is unsigned entity. Using negative value is out-of-bound
access by definition.
2)
On x86_64 unsigned 32-bit data which are mixed with pointers
via array indexing or offsets added or subtracted to pointers
are preffered to signed 32-bit data.
"int" being used as an array index needs to be sign-extended
to 64-bit before being used.
void f(long *p, int i)
{
g(p[i]);
}
roughly translates to
movsx rsi, esi
mov rdi, [rsi+...]
call g
MOVSX is 3 byte instruction which isn't necessary if the variable is
unsigned because x86_64 is zero extending by default.
Now, there is net_generic() function which, you guessed it right, uses
"int" as an array index:
static inline void *net_generic(const struct net *net, int id)
{
...
ptr = ng->ptr[id - 1];
...
}
And this function is used a lot, so those sign extensions add up.
Patch snipes ~1730 bytes on allyesconfig kernel (without all junk
messing with code generation):
add/remove: 0/0 grow/shrink: 70/598 up/down: 396/-2126 (-1730)
Unfortunately some functions actually grow bigger.
This is a semmingly random artefact of code generation with register
allocator being used differently. gcc decides that some variable
needs to live in new r8+ registers and every access now requires REX
prefix. Or it is shifted into r12, so [r12+0] addressing mode has to be
used which is longer than [r8]
However, overall balance is in negative direction:
add/remove: 0/0 grow/shrink: 70/598 up/down: 396/-2126 (-1730)
function old new delta
nfsd4_lock 3886 3959 +73
tipc_link_build_proto_msg 1096 1140 +44
mac80211_hwsim_new_radio 2776 2808 +32
tipc_mon_rcv 1032 1058 +26
svcauth_gss_legacy_init 1413 1429 +16
tipc_bcbase_select_primary 379 392 +13
nfsd4_exchange_id 1247 1260 +13
nfsd4_setclientid_confirm 782 793 +11
...
put_client_renew_locked 494 480 -14
ip_set_sockfn_get 730 716 -14
geneve_sock_add 829 813 -16
nfsd4_sequence_done 721 703 -18
nlmclnt_lookup_host 708 686 -22
nfsd4_lockt 1085 1063 -22
nfs_get_client 1077 1050 -27
tcf_bpf_init 1106 1076 -30
nfsd4_encode_fattr 5997 5930 -67
Total: Before=154856051, After=154854321, chg -0.00%
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-17 02:58:21 +01:00
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static unsigned int vti_net_id __read_mostly;
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2012-07-17 11:44:54 +02:00
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static int vti_tunnel_init(struct net_device *dev);
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2014-02-21 08:41:10 +01:00
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static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
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2019-03-23 15:43:02 +01:00
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int encap_type, bool update_skb_dev)
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2012-07-17 11:44:54 +02:00
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{
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struct ip_tunnel *tunnel;
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const struct iphdr *iph = ip_hdr(skb);
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2013-07-21 04:46:25 +02:00
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struct net *net = dev_net(skb->dev);
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struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
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2012-07-17 11:44:54 +02:00
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2013-07-21 04:46:25 +02:00
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tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
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iph->saddr, iph->daddr, 0);
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2015-04-03 10:17:27 +02:00
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if (tunnel) {
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2014-02-21 08:41:10 +01:00
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if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
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goto drop;
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XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
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2019-03-23 15:43:02 +01:00
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if (update_skb_dev)
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skb->dev = tunnel->dev;
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2014-02-21 08:41:10 +01:00
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return xfrm_input(skb, nexthdr, spi, encap_type);
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}
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return -EINVAL;
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drop:
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kfree_skb(skb);
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return 0;
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}
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2019-03-23 15:43:02 +01:00
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static int vti_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi,
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int encap_type)
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2019-01-07 03:31:20 +01:00
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{
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2019-03-23 15:43:02 +01:00
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return vti_input(skb, nexthdr, spi, encap_type, false);
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2019-01-07 03:31:20 +01:00
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}
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2019-03-23 15:43:02 +01:00
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static int vti_rcv(struct sk_buff *skb, __be32 spi, bool update_skb_dev)
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2014-02-21 08:41:10 +01:00
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{
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XFRM_SPI_SKB_CB(skb)->family = AF_INET;
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XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
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2019-03-23 15:43:02 +01:00
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return vti_input(skb, ip_hdr(skb)->protocol, spi, 0, update_skb_dev);
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2014-02-21 08:41:10 +01:00
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}
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2019-03-23 15:43:02 +01:00
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static int vti_rcv_proto(struct sk_buff *skb)
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2019-01-07 03:31:20 +01:00
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{
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2019-03-23 15:43:02 +01:00
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return vti_rcv(skb, 0, false);
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}
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2019-01-07 03:31:20 +01:00
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2019-03-23 15:43:02 +01:00
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static int vti_rcv_tunnel(struct sk_buff *skb)
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{
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return vti_rcv(skb, ip_hdr(skb)->saddr, true);
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2019-01-07 03:31:20 +01:00
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}
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2014-02-21 08:41:10 +01:00
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static int vti_rcv_cb(struct sk_buff *skb, int err)
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{
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unsigned short family;
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struct net_device *dev;
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struct pcpu_sw_netstats *tstats;
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struct xfrm_state *x;
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2019-03-29 21:16:31 +01:00
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const struct xfrm_mode *inner_mode;
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2014-02-21 08:41:10 +01:00
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struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
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2015-05-27 16:16:54 +02:00
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u32 orig_mark = skb->mark;
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int ret;
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2014-02-21 08:41:10 +01:00
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if (!tunnel)
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2012-07-17 11:44:54 +02:00
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return 1;
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2014-02-21 08:41:10 +01:00
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dev = tunnel->dev;
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if (err) {
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dev->stats.rx_errors++;
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dev->stats.rx_dropped++;
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return 0;
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2012-07-17 11:44:54 +02:00
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}
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2014-02-21 08:41:10 +01:00
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x = xfrm_input_state(skb);
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2016-09-07 20:40:38 +02:00
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2019-03-29 21:16:32 +01:00
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inner_mode = &x->inner_mode;
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2016-09-07 20:40:38 +02:00
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if (x->sel.family == AF_UNSPEC) {
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inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
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if (inner_mode == NULL) {
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XFRM_INC_STATS(dev_net(skb->dev),
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LINUX_MIB_XFRMINSTATEMODEERROR);
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return -EINVAL;
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}
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}
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2019-03-29 21:16:23 +01:00
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family = inner_mode->family;
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2014-02-21 08:41:10 +01:00
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2015-05-27 16:16:54 +02:00
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skb->mark = be32_to_cpu(tunnel->parms.i_key);
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ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
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skb->mark = orig_mark;
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if (!ret)
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2014-02-21 08:41:10 +01:00
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return -EPERM;
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skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
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skb->dev = dev;
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tstats = this_cpu_ptr(dev->tstats);
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u64_stats_update_begin(&tstats->syncp);
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tstats->rx_packets++;
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tstats->rx_bytes += skb->len;
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u64_stats_update_end(&tstats->syncp);
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return 0;
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2012-07-17 11:44:54 +02:00
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}
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2014-02-21 08:41:11 +01:00
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static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
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{
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xfrm_address_t *daddr = (xfrm_address_t *)&dst;
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xfrm_address_t *saddr = (xfrm_address_t *)&src;
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/* if there is no transform then this tunnel is not functional.
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* Or if the xfrm is not mode tunnel.
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*/
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if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
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x->props.family != AF_INET)
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return false;
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if (!dst)
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return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
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if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
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return false;
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return true;
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}
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2014-02-21 08:41:10 +01:00
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static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
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struct flowi *fl)
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2012-07-17 11:44:54 +02:00
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{
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struct ip_tunnel *tunnel = netdev_priv(dev);
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2014-02-21 08:41:11 +01:00
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struct ip_tunnel_parm *parms = &tunnel->parms;
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2014-02-21 08:41:10 +01:00
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struct dst_entry *dst = skb_dst(skb);
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2012-07-17 11:44:54 +02:00
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struct net_device *tdev; /* Device to other host */
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2017-09-26 14:14:29 +02:00
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int pkt_len = skb->len;
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2013-07-21 04:46:25 +02:00
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int err;
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2016-03-16 10:17:37 +01:00
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int mtu;
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2012-07-17 11:44:54 +02:00
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2014-02-21 08:41:10 +01:00
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if (!dst) {
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2014-02-21 08:41:10 +01:00
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dev->stats.tx_carrier_errors++;
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goto tx_error_icmp;
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}
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2012-07-17 11:44:54 +02:00
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2014-02-21 08:41:10 +01:00
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dst_hold(dst);
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2014-02-21 08:41:10 +01:00
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dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
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2014-02-21 08:41:10 +01:00
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if (IS_ERR(dst)) {
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2012-07-17 11:44:54 +02:00
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dev->stats.tx_carrier_errors++;
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goto tx_error_icmp;
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}
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2014-02-21 08:41:10 +01:00
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2014-02-21 08:41:11 +01:00
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if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
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2012-07-17 11:44:54 +02:00
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dev->stats.tx_carrier_errors++;
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2014-02-21 08:41:10 +01:00
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dst_release(dst);
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2012-07-17 11:44:54 +02:00
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goto tx_error_icmp;
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}
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2014-02-21 08:41:11 +01:00
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2014-02-21 08:41:10 +01:00
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tdev = dst->dev;
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2012-07-17 11:44:54 +02:00
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if (tdev == dev) {
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2014-02-21 08:41:10 +01:00
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dst_release(dst);
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2012-07-17 11:44:54 +02:00
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dev->stats.collisions++;
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goto tx_error;
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}
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2016-03-16 10:17:37 +01:00
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mtu = dst_mtu(dst);
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if (skb->len > mtu) {
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2018-01-25 19:03:03 +01:00
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skb_dst_update_pmtu(skb, mtu);
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2016-03-16 10:17:37 +01:00
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if (skb->protocol == htons(ETH_P_IP)) {
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icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
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htonl(mtu));
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} else {
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if (mtu < IPV6_MIN_MTU)
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mtu = IPV6_MIN_MTU;
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icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
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}
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dst_release(dst);
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goto tx_error;
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}
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2014-02-21 08:41:10 +01:00
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skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
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2014-02-21 08:41:10 +01:00
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skb_dst_set(skb, dst);
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2012-07-17 11:44:54 +02:00
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skb->dev = skb_dst(skb)->dev;
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2015-10-07 23:48:35 +02:00
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err = dst_output(tunnel->net, skb->sk, skb);
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2013-07-21 04:46:25 +02:00
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if (net_xmit_eval(err) == 0)
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2017-09-26 14:14:29 +02:00
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err = pkt_len;
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2015-12-24 23:34:54 +01:00
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iptunnel_xmit_stats(dev, err);
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2012-07-17 11:44:54 +02:00
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return NETDEV_TX_OK;
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tx_error_icmp:
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dst_link_failure(skb);
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tx_error:
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dev->stats.tx_errors++;
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2014-01-19 03:27:49 +01:00
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kfree_skb(skb);
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2012-07-17 11:44:54 +02:00
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return NETDEV_TX_OK;
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}
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|
2014-02-21 08:41:10 +01:00
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/* This function assumes it is being called from dev_queue_xmit()
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* and that skb is filled properly by that function.
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*/
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static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct ip_tunnel *tunnel = netdev_priv(dev);
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struct flowi fl;
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2018-12-30 23:24:36 +01:00
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if (!pskb_inet_may_pull(skb))
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goto tx_err;
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2014-02-21 08:41:10 +01:00
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memset(&fl, 0, sizeof(fl));
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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|
|
xfrm_decode_session(skb, &fl, AF_INET);
|
|
|
|
memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
|
|
|
|
break;
|
|
|
|
case htons(ETH_P_IPV6):
|
|
|
|
xfrm_decode_session(skb, &fl, AF_INET6);
|
|
|
|
memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
|
|
|
|
break;
|
|
|
|
default:
|
2018-12-30 23:24:36 +01:00
|
|
|
goto tx_err;
|
2014-02-21 08:41:10 +01:00
|
|
|
}
|
|
|
|
|
2015-05-27 16:16:43 +02:00
|
|
|
/* override mark with tunnel output key */
|
|
|
|
fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);
|
|
|
|
|
2014-02-21 08:41:10 +01:00
|
|
|
return vti_xmit(skb, dev, &fl);
|
2018-12-30 23:24:36 +01:00
|
|
|
|
|
|
|
tx_err:
|
|
|
|
dev->stats.tx_errors++;
|
|
|
|
kfree_skb(skb);
|
|
|
|
return NETDEV_TX_OK;
|
2014-02-21 08:41:10 +01:00
|
|
|
}
|
|
|
|
|
2014-02-21 08:41:10 +01:00
|
|
|
static int vti4_err(struct sk_buff *skb, u32 info)
|
|
|
|
{
|
|
|
|
__be32 spi;
|
2014-05-12 09:09:26 +02:00
|
|
|
__u32 mark;
|
2014-02-21 08:41:10 +01:00
|
|
|
struct xfrm_state *x;
|
|
|
|
struct ip_tunnel *tunnel;
|
|
|
|
struct ip_esp_hdr *esph;
|
|
|
|
struct ip_auth_hdr *ah ;
|
|
|
|
struct ip_comp_hdr *ipch;
|
|
|
|
struct net *net = dev_net(skb->dev);
|
|
|
|
const struct iphdr *iph = (const struct iphdr *)skb->data;
|
|
|
|
int protocol = iph->protocol;
|
|
|
|
struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
|
|
|
|
|
|
|
|
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
|
|
|
|
iph->daddr, iph->saddr, 0);
|
|
|
|
if (!tunnel)
|
|
|
|
return -1;
|
|
|
|
|
2014-05-12 09:09:26 +02:00
|
|
|
mark = be32_to_cpu(tunnel->parms.o_key);
|
|
|
|
|
2014-02-21 08:41:10 +01:00
|
|
|
switch (protocol) {
|
|
|
|
case IPPROTO_ESP:
|
|
|
|
esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
|
|
|
|
spi = esph->spi;
|
|
|
|
break;
|
|
|
|
case IPPROTO_AH:
|
|
|
|
ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
|
|
|
|
spi = ah->spi;
|
|
|
|
break;
|
|
|
|
case IPPROTO_COMP:
|
|
|
|
ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
|
|
|
|
spi = htonl(ntohs(ipch->cpi));
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (icmp_hdr(skb)->type) {
|
|
|
|
case ICMP_DEST_UNREACH:
|
|
|
|
if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
|
|
|
|
return 0;
|
|
|
|
case ICMP_REDIRECT:
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2014-05-12 09:09:26 +02:00
|
|
|
x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
|
2014-02-21 08:41:10 +01:00
|
|
|
spi, protocol, AF_INET);
|
|
|
|
if (!x)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
|
2018-09-26 05:56:26 +02:00
|
|
|
ipv4_update_pmtu(skb, net, info, 0, protocol);
|
2014-02-21 08:41:10 +01:00
|
|
|
else
|
2018-09-26 05:56:27 +02:00
|
|
|
ipv4_redirect(skb, net, 0, protocol);
|
2014-02-21 08:41:10 +01:00
|
|
|
xfrm_state_put(x);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2012-07-17 11:44:54 +02:00
|
|
|
static int
|
|
|
|
vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
|
|
|
|
{
|
|
|
|
int err = 0;
|
|
|
|
struct ip_tunnel_parm p;
|
|
|
|
|
2013-07-21 04:46:25 +02:00
|
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
|
|
|
|
return -EFAULT;
|
2012-07-17 11:44:54 +02:00
|
|
|
|
2013-07-21 04:46:25 +02:00
|
|
|
if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
|
2012-07-17 11:44:54 +02:00
|
|
|
if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
|
|
|
|
p.iph.ihl != 5)
|
2013-07-21 04:46:25 +02:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
2012-07-17 11:44:54 +02:00
|
|
|
|
2014-06-08 00:06:25 +02:00
|
|
|
if (!(p.i_flags & GRE_KEY))
|
|
|
|
p.i_key = 0;
|
|
|
|
if (!(p.o_flags & GRE_KEY))
|
|
|
|
p.o_key = 0;
|
|
|
|
|
|
|
|
p.i_flags = VTI_ISVTI;
|
|
|
|
|
2013-07-21 04:46:25 +02:00
|
|
|
err = ip_tunnel_ioctl(dev, &p, cmd);
|
|
|
|
if (err)
|
|
|
|
return err;
|
2012-07-17 11:44:54 +02:00
|
|
|
|
2013-07-21 04:46:25 +02:00
|
|
|
if (cmd != SIOCDELTUNNEL) {
|
2014-02-21 08:41:10 +01:00
|
|
|
p.i_flags |= GRE_KEY;
|
2013-07-21 04:46:25 +02:00
|
|
|
p.o_flags |= GRE_KEY;
|
2012-07-17 11:44:54 +02:00
|
|
|
}
|
|
|
|
|
2013-07-21 04:46:25 +02:00
|
|
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
|
|
|
|
return -EFAULT;
|
2012-07-17 11:44:54 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct net_device_ops vti_netdev_ops = {
|
|
|
|
.ndo_init = vti_tunnel_init,
|
2013-07-21 04:46:25 +02:00
|
|
|
.ndo_uninit = ip_tunnel_uninit,
|
2012-07-17 11:44:54 +02:00
|
|
|
.ndo_start_xmit = vti_tunnel_xmit,
|
|
|
|
.ndo_do_ioctl = vti_tunnel_ioctl,
|
2013-07-21 04:46:25 +02:00
|
|
|
.ndo_change_mtu = ip_tunnel_change_mtu,
|
2013-03-25 15:50:00 +01:00
|
|
|
.ndo_get_stats64 = ip_tunnel_get_stats64,
|
2015-04-02 17:07:02 +02:00
|
|
|
.ndo_get_iflink = ip_tunnel_get_iflink,
|
2012-07-17 11:44:54 +02:00
|
|
|
};
|
|
|
|
|
2013-07-21 04:46:25 +02:00
|
|
|
static void vti_tunnel_setup(struct net_device *dev)
|
2012-07-17 11:44:54 +02:00
|
|
|
{
|
2013-07-21 04:46:25 +02:00
|
|
|
dev->netdev_ops = &vti_netdev_ops;
|
2014-04-11 15:51:19 +02:00
|
|
|
dev->type = ARPHRD_TUNNEL;
|
2013-07-21 04:46:25 +02:00
|
|
|
ip_tunnel_setup(dev, vti_net_id);
|
2012-07-17 11:44:54 +02:00
|
|
|
}
|
|
|
|
|
2013-07-21 04:46:25 +02:00
|
|
|
static int vti_tunnel_init(struct net_device *dev)
|
2012-07-17 11:44:54 +02:00
|
|
|
{
|
2013-07-21 04:46:25 +02:00
|
|
|
struct ip_tunnel *tunnel = netdev_priv(dev);
|
|
|
|
struct iphdr *iph = &tunnel->parms.iph;
|
|
|
|
|
|
|
|
memcpy(dev->dev_addr, &iph->saddr, 4);
|
|
|
|
memcpy(dev->broadcast, &iph->daddr, 4);
|
2012-07-17 11:44:54 +02:00
|
|
|
|
|
|
|
dev->flags = IFF_NOARP;
|
|
|
|
dev->addr_len = 4;
|
|
|
|
dev->features |= NETIF_F_LLTX;
|
2014-10-06 03:38:35 +02:00
|
|
|
netif_keep_dst(dev);
|
2012-07-17 11:44:54 +02:00
|
|
|
|
2013-07-21 04:46:25 +02:00
|
|
|
return ip_tunnel_init(dev);
|
2012-07-17 11:44:54 +02:00
|
|
|
}
|
|
|
|
|
2013-07-21 04:46:25 +02:00
|
|
|
static void __net_init vti_fb_tunnel_init(struct net_device *dev)
|
2012-07-17 11:44:54 +02:00
|
|
|
{
|
|
|
|
struct ip_tunnel *tunnel = netdev_priv(dev);
|
|
|
|
struct iphdr *iph = &tunnel->parms.iph;
|
|
|
|
|
|
|
|
iph->version = 4;
|
|
|
|
iph->protocol = IPPROTO_IPIP;
|
|
|
|
iph->ihl = 5;
|
|
|
|
}
|
|
|
|
|
2014-02-21 08:41:10 +01:00
|
|
|
static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
|
2019-03-23 15:43:02 +01:00
|
|
|
.handler = vti_rcv_proto,
|
|
|
|
.input_handler = vti_input_proto,
|
2014-02-21 08:41:10 +01:00
|
|
|
.cb_handler = vti_rcv_cb,
|
|
|
|
.err_handler = vti4_err,
|
|
|
|
.priority = 100,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
|
2019-03-23 15:43:02 +01:00
|
|
|
.handler = vti_rcv_proto,
|
|
|
|
.input_handler = vti_input_proto,
|
2014-02-21 08:41:10 +01:00
|
|
|
.cb_handler = vti_rcv_cb,
|
|
|
|
.err_handler = vti4_err,
|
|
|
|
.priority = 100,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
|
2019-03-23 15:43:02 +01:00
|
|
|
.handler = vti_rcv_proto,
|
|
|
|
.input_handler = vti_input_proto,
|
2014-02-21 08:41:10 +01:00
|
|
|
.cb_handler = vti_rcv_cb,
|
|
|
|
.err_handler = vti4_err,
|
|
|
|
.priority = 100,
|
2012-07-17 11:44:54 +02:00
|
|
|
};
|
|
|
|
|
2019-01-07 03:31:20 +01:00
|
|
|
static struct xfrm_tunnel ipip_handler __read_mostly = {
|
2019-03-23 15:43:02 +01:00
|
|
|
.handler = vti_rcv_tunnel,
|
2019-01-07 03:31:20 +01:00
|
|
|
.err_handler = vti4_err,
|
|
|
|
.priority = 0,
|
|
|
|
};
|
|
|
|
|
2012-07-17 11:44:54 +02:00
|
|
|
static int __net_init vti_init_net(struct net *net)
|
|
|
|
{
|
|
|
|
int err;
|
2013-07-21 04:46:25 +02:00
|
|
|
struct ip_tunnel_net *itn;
|
2012-07-17 11:44:54 +02:00
|
|
|
|
2013-07-21 04:46:25 +02:00
|
|
|
err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
|
2012-07-17 11:44:54 +02:00
|
|
|
if (err)
|
2013-07-21 04:46:25 +02:00
|
|
|
return err;
|
|
|
|
itn = net_generic(net, vti_net_id);
|
2018-08-19 09:05:04 +02:00
|
|
|
if (itn->fb_tunnel_dev)
|
|
|
|
vti_fb_tunnel_init(itn->fb_tunnel_dev);
|
2012-07-17 11:44:54 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2017-09-20 01:27:09 +02:00
|
|
|
static void __net_exit vti_exit_batch_net(struct list_head *list_net)
|
2012-07-17 11:44:54 +02:00
|
|
|
{
|
2017-09-20 01:27:09 +02:00
|
|
|
ip_tunnel_delete_nets(list_net, vti_net_id, &vti_link_ops);
|
2012-07-17 11:44:54 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct pernet_operations vti_net_ops = {
|
|
|
|
.init = vti_init_net,
|
2017-09-20 01:27:09 +02:00
|
|
|
.exit_batch = vti_exit_batch_net,
|
2012-07-17 11:44:54 +02:00
|
|
|
.id = &vti_net_id,
|
2013-07-21 04:46:25 +02:00
|
|
|
.size = sizeof(struct ip_tunnel_net),
|
2012-07-17 11:44:54 +02:00
|
|
|
};
|
|
|
|
|
2017-06-25 23:56:01 +02:00
|
|
|
static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
|
|
|
|
struct netlink_ext_ack *extack)
|
2012-07-17 11:44:54 +02:00
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void vti_netlink_parms(struct nlattr *data[],
|
2017-04-19 18:30:54 +02:00
|
|
|
struct ip_tunnel_parm *parms,
|
|
|
|
__u32 *fwmark)
|
2012-07-17 11:44:54 +02:00
|
|
|
{
|
|
|
|
memset(parms, 0, sizeof(*parms));
|
|
|
|
|
|
|
|
parms->iph.protocol = IPPROTO_IPIP;
|
|
|
|
|
|
|
|
if (!data)
|
|
|
|
return;
|
|
|
|
|
2014-02-21 08:41:10 +01:00
|
|
|
parms->i_flags = VTI_ISVTI;
|
|
|
|
|
2012-07-17 11:44:54 +02:00
|
|
|
if (data[IFLA_VTI_LINK])
|
|
|
|
parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
|
|
|
|
|
|
|
|
if (data[IFLA_VTI_IKEY])
|
|
|
|
parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
|
|
|
|
|
|
|
|
if (data[IFLA_VTI_OKEY])
|
|
|
|
parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
|
|
|
|
|
|
|
|
if (data[IFLA_VTI_LOCAL])
|
2015-03-29 16:59:26 +02:00
|
|
|
parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]);
|
2012-07-17 11:44:54 +02:00
|
|
|
|
|
|
|
if (data[IFLA_VTI_REMOTE])
|
2015-03-29 16:59:26 +02:00
|
|
|
parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]);
|
2012-07-17 11:44:54 +02:00
|
|
|
|
2017-04-19 18:30:54 +02:00
|
|
|
if (data[IFLA_VTI_FWMARK])
|
|
|
|
*fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
|
2012-07-17 11:44:54 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static int vti_newlink(struct net *src_net, struct net_device *dev,
|
2017-06-25 23:55:59 +02:00
|
|
|
struct nlattr *tb[], struct nlattr *data[],
|
|
|
|
struct netlink_ext_ack *extack)
|
2012-07-17 11:44:54 +02:00
|
|
|
{
|
2013-07-21 04:46:25 +02:00
|
|
|
struct ip_tunnel_parm parms;
|
2017-04-19 18:30:54 +02:00
|
|
|
__u32 fwmark = 0;
|
2012-07-17 11:44:54 +02:00
|
|
|
|
2017-04-19 18:30:54 +02:00
|
|
|
vti_netlink_parms(data, &parms, &fwmark);
|
|
|
|
return ip_tunnel_newlink(dev, tb, &parms, fwmark);
|
2012-07-17 11:44:54 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
|
2017-06-25 23:56:00 +02:00
|
|
|
struct nlattr *data[],
|
|
|
|
struct netlink_ext_ack *extack)
|
2012-07-17 11:44:54 +02:00
|
|
|
{
|
2017-04-19 18:30:54 +02:00
|
|
|
struct ip_tunnel *t = netdev_priv(dev);
|
|
|
|
__u32 fwmark = t->fwmark;
|
2012-07-17 11:44:54 +02:00
|
|
|
struct ip_tunnel_parm p;
|
|
|
|
|
2017-04-19 18:30:54 +02:00
|
|
|
vti_netlink_parms(data, &p, &fwmark);
|
|
|
|
return ip_tunnel_changelink(dev, tb, &p, fwmark);
|
2012-07-17 11:44:54 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static size_t vti_get_size(const struct net_device *dev)
|
|
|
|
{
|
|
|
|
return
|
|
|
|
/* IFLA_VTI_LINK */
|
|
|
|
nla_total_size(4) +
|
|
|
|
/* IFLA_VTI_IKEY */
|
|
|
|
nla_total_size(4) +
|
|
|
|
/* IFLA_VTI_OKEY */
|
|
|
|
nla_total_size(4) +
|
|
|
|
/* IFLA_VTI_LOCAL */
|
|
|
|
nla_total_size(4) +
|
|
|
|
/* IFLA_VTI_REMOTE */
|
|
|
|
nla_total_size(4) +
|
2017-04-19 18:30:54 +02:00
|
|
|
/* IFLA_VTI_FWMARK */
|
|
|
|
nla_total_size(4) +
|
2012-07-17 11:44:54 +02:00
|
|
|
0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
|
|
|
|
{
|
|
|
|
struct ip_tunnel *t = netdev_priv(dev);
|
|
|
|
struct ip_tunnel_parm *p = &t->parms;
|
|
|
|
|
2017-05-08 11:57:13 +02:00
|
|
|
if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) ||
|
|
|
|
nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) ||
|
|
|
|
nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) ||
|
|
|
|
nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) ||
|
|
|
|
nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) ||
|
|
|
|
nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark))
|
|
|
|
return -EMSGSIZE;
|
2012-07-17 11:44:54 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
|
|
|
|
[IFLA_VTI_LINK] = { .type = NLA_U32 },
|
|
|
|
[IFLA_VTI_IKEY] = { .type = NLA_U32 },
|
|
|
|
[IFLA_VTI_OKEY] = { .type = NLA_U32 },
|
|
|
|
[IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
|
|
|
|
[IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
|
2017-04-19 18:30:54 +02:00
|
|
|
[IFLA_VTI_FWMARK] = { .type = NLA_U32 },
|
2012-07-17 11:44:54 +02:00
|
|
|
};
|
|
|
|
|
|
|
|
static struct rtnl_link_ops vti_link_ops __read_mostly = {
|
|
|
|
.kind = "vti",
|
|
|
|
.maxtype = IFLA_VTI_MAX,
|
|
|
|
.policy = vti_policy,
|
|
|
|
.priv_size = sizeof(struct ip_tunnel),
|
|
|
|
.setup = vti_tunnel_setup,
|
|
|
|
.validate = vti_tunnel_validate,
|
|
|
|
.newlink = vti_newlink,
|
|
|
|
.changelink = vti_changelink,
|
ip_tunnel: the lack of vti_link_ops' dellink() cause kernel panic
Now the vti_link_ops do not point the .dellink, for fb tunnel device
(ip_vti0), the net_device will be removed as the default .dellink is
unregister_netdevice_queue,but the tunnel still in the tunnel list,
then if we add a new vti tunnel, in ip_tunnel_find():
hlist_for_each_entry_rcu(t, head, hash_node) {
if (local == t->parms.iph.saddr &&
remote == t->parms.iph.daddr &&
link == t->parms.link &&
==> type == t->dev->type &&
ip_tunnel_key_match(&t->parms, flags, key))
break;
}
the panic will happen, cause dev of ip_tunnel *t is null:
[ 3835.072977] IP: [<ffffffffa04103fd>] ip_tunnel_find+0x9d/0xc0 [ip_tunnel]
[ 3835.073008] PGD b2c21067 PUD b7277067 PMD 0
[ 3835.073008] Oops: 0000 [#1] SMP
.....
[ 3835.073008] Stack:
[ 3835.073008] ffff8800b72d77f0 ffffffffa0411924 ffff8800bb956000 ffff8800b72d78e0
[ 3835.073008] ffff8800b72d78a0 0000000000000000 ffffffffa040d100 ffff8800b72d7858
[ 3835.073008] ffffffffa040b2e3 0000000000000000 0000000000000000 0000000000000000
[ 3835.073008] Call Trace:
[ 3835.073008] [<ffffffffa0411924>] ip_tunnel_newlink+0x64/0x160 [ip_tunnel]
[ 3835.073008] [<ffffffffa040b2e3>] vti_newlink+0x43/0x70 [ip_vti]
[ 3835.073008] [<ffffffff8150d4da>] rtnl_newlink+0x4fa/0x5f0
[ 3835.073008] [<ffffffff812f68bb>] ? nla_strlcpy+0x5b/0x70
[ 3835.073008] [<ffffffff81508fb0>] ? rtnl_link_ops_get+0x40/0x60
[ 3835.073008] [<ffffffff8150d11f>] ? rtnl_newlink+0x13f/0x5f0
[ 3835.073008] [<ffffffff81509cf4>] rtnetlink_rcv_msg+0xa4/0x270
[ 3835.073008] [<ffffffff8126adf5>] ? sock_has_perm+0x75/0x90
[ 3835.073008] [<ffffffff81509c50>] ? rtnetlink_rcv+0x30/0x30
[ 3835.073008] [<ffffffff81529e39>] netlink_rcv_skb+0xa9/0xc0
[ 3835.073008] [<ffffffff81509c48>] rtnetlink_rcv+0x28/0x30
....
modprobe ip_vti
ip link del ip_vti0 type vti
ip link add ip_vti0 type vti
rmmod ip_vti
do that one or more times, kernel will panic.
fix it by assigning ip_tunnel_dellink to vti_link_ops' dellink, in
which we skip the unregister of fb tunnel device. do the same on ip6_vti.
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-11-23 08:04:11 +01:00
|
|
|
.dellink = ip_tunnel_dellink,
|
2012-07-17 11:44:54 +02:00
|
|
|
.get_size = vti_get_size,
|
|
|
|
.fill_info = vti_fill_info,
|
2015-01-15 15:11:17 +01:00
|
|
|
.get_link_net = ip_tunnel_get_link_net,
|
2012-07-17 11:44:54 +02:00
|
|
|
};
|
|
|
|
|
|
|
|
static int __init vti_init(void)
|
|
|
|
{
|
2014-05-09 23:43:42 +02:00
|
|
|
const char *msg;
|
2012-07-17 11:44:54 +02:00
|
|
|
int err;
|
|
|
|
|
2014-05-09 23:43:42 +02:00
|
|
|
pr_info("IPv4 over IPsec tunneling driver\n");
|
2012-07-17 11:44:54 +02:00
|
|
|
|
2014-05-09 23:43:42 +02:00
|
|
|
msg = "tunnel device";
|
2012-07-17 11:44:54 +02:00
|
|
|
err = register_pernet_device(&vti_net_ops);
|
|
|
|
if (err < 0)
|
2014-05-09 23:43:42 +02:00
|
|
|
goto pernet_dev_failed;
|
2014-02-21 08:41:10 +01:00
|
|
|
|
2014-05-09 23:43:42 +02:00
|
|
|
msg = "tunnel protocols";
|
|
|
|
err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
|
|
|
|
if (err < 0)
|
|
|
|
goto xfrm_proto_esp_failed;
|
2014-02-21 08:41:10 +01:00
|
|
|
err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
|
2014-05-09 23:43:42 +02:00
|
|
|
if (err < 0)
|
|
|
|
goto xfrm_proto_ah_failed;
|
2014-02-21 08:41:10 +01:00
|
|
|
err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
|
2014-05-09 23:43:42 +02:00
|
|
|
if (err < 0)
|
|
|
|
goto xfrm_proto_comp_failed;
|
2012-07-17 11:44:54 +02:00
|
|
|
|
2019-01-07 03:31:20 +01:00
|
|
|
msg = "ipip tunnel";
|
|
|
|
err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
|
2019-03-19 16:39:21 +01:00
|
|
|
if (err < 0)
|
2019-01-07 03:31:20 +01:00
|
|
|
goto xfrm_tunnel_failed;
|
|
|
|
|
2014-05-09 23:43:42 +02:00
|
|
|
msg = "netlink interface";
|
2012-07-17 11:44:54 +02:00
|
|
|
err = rtnl_link_register(&vti_link_ops);
|
|
|
|
if (err < 0)
|
|
|
|
goto rtnl_link_failed;
|
|
|
|
|
|
|
|
return err;
|
|
|
|
|
|
|
|
rtnl_link_failed:
|
2019-01-07 03:31:20 +01:00
|
|
|
xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
|
2019-03-19 16:39:20 +01:00
|
|
|
xfrm_tunnel_failed:
|
|
|
|
xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
|
2014-05-09 23:43:42 +02:00
|
|
|
xfrm_proto_comp_failed:
|
2014-02-21 08:41:10 +01:00
|
|
|
xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
|
2014-05-09 23:43:42 +02:00
|
|
|
xfrm_proto_ah_failed:
|
2014-02-21 08:41:10 +01:00
|
|
|
xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
|
2014-05-09 23:43:42 +02:00
|
|
|
xfrm_proto_esp_failed:
|
2012-07-17 11:44:54 +02:00
|
|
|
unregister_pernet_device(&vti_net_ops);
|
2014-05-09 23:43:42 +02:00
|
|
|
pernet_dev_failed:
|
|
|
|
pr_err("vti init: failed to register %s\n", msg);
|
2012-07-17 11:44:54 +02:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit vti_fini(void)
|
|
|
|
{
|
|
|
|
rtnl_link_unregister(&vti_link_ops);
|
2019-03-19 16:39:20 +01:00
|
|
|
xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
|
2014-05-09 23:43:42 +02:00
|
|
|
xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
|
|
|
|
xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
|
|
|
|
xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
|
2012-07-17 11:44:54 +02:00
|
|
|
unregister_pernet_device(&vti_net_ops);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(vti_init);
|
|
|
|
module_exit(vti_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_ALIAS_RTNL_LINK("vti");
|
|
|
|
MODULE_ALIAS_NETDEV("ip_vti0");
|