ipv6: allocate enough headroom in ip6_finish_output2()

When TEE target mirrors traffic to another interface, sk_buff may
not have enough headroom to be processed correctly.
ip_finish_output2() detect this situation for ipv4 and allocates
new skb with enogh headroom. However ipv6 lacks this logic in
ip_finish_output2 and it leads to skb_under_panic:

 skbuff: skb_under_panic: text:ffffffffc0866ad4 len:96 put:24
 head:ffff97be85e31800 data:ffff97be85e317f8 tail:0x58 end:0xc0 dev:gre0
 ------------[ cut here ]------------
 kernel BUG at net/core/skbuff.c:110!
 invalid opcode: 0000 [#1] SMP PTI
 CPU: 2 PID: 393 Comm: kworker/2:2 Tainted: G           OE     5.13.0 #13
 Hardware name: Virtuozzo KVM, BIOS 1.11.0-2.vz7.4 04/01/2014
 Workqueue: ipv6_addrconf addrconf_dad_work
 RIP: 0010:skb_panic+0x48/0x4a
 Call Trace:
  skb_push.cold.111+0x10/0x10
  ipgre_header+0x24/0xf0 [ip_gre]
  neigh_connected_output+0xae/0xf0
  ip6_finish_output2+0x1a8/0x5a0
  ip6_output+0x5c/0x110
  nf_dup_ipv6+0x158/0x1000 [nf_dup_ipv6]
  tee_tg6+0x2e/0x40 [xt_TEE]
  ip6t_do_table+0x294/0x470 [ip6_tables]
  nf_hook_slow+0x44/0xc0
  nf_hook.constprop.34+0x72/0xe0
  ndisc_send_skb+0x20d/0x2e0
  ndisc_send_ns+0xd1/0x210
  addrconf_dad_work+0x3c8/0x540
  process_one_work+0x1d1/0x370
  worker_thread+0x30/0x390
  kthread+0x116/0x130
  ret_from_fork+0x22/0x30

Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index d4ee2169afd81613ea29d27b3dfb885294c22366..01bea76e3891c2ee8667ee83fdbff5b26fe8a23f 100644 (file)
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -60,10 +60,38 @@ static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *
 {
        struct dst_entry *dst = skb_dst(skb);
        struct net_device *dev = dst->dev;
+       unsigned int hh_len = LL_RESERVED_SPACE(dev);
+       int delta = hh_len - skb_headroom(skb);
        const struct in6_addr *nexthop;
        struct neighbour *neigh;
        int ret;
 
+       /* Be paranoid, rather than too clever. */
+       if (unlikely(delta > 0) && dev->header_ops) {
+               /* pskb_expand_head() might crash, if skb is shared */
+               if (skb_shared(skb)) {
+                       struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
+
+                       if (likely(nskb)) {
+                               if (skb->sk)
+                                       skb_set_owner_w(skb, skb->sk);
+                               consume_skb(skb);
+                       } else {
+                               kfree_skb(skb);
+                       }
+                       skb = nskb;
+               }
+               if (skb &&
+                   pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
+                       kfree_skb(skb);
+                       skb = NULL;
+               }
+               if (!skb) {
+                       IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS);
+                       return -ENOMEM;
+               }
+       }
+
        if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
                struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));