22 Jul, 2018

1 commit

• b124e97f3   nsh: set mac len based on inner packet ... Browse Code »

  commit bab2c80e5a6c855657482eac9e97f5f3eedb509a upstream.

  When pulling the NSH header in nsh_gso_segment, set the mac length
  based on the encapsulated packet type.

  skb_reset_mac_len computes an offset to the network header, which
  here still points to the outer packet:

  > skb_reset_network_header(skb);
  > [...]
  > __skb_pull(skb, nsh_len);
  > skb_reset_mac_header(skb); // now mac hdr starts nsh_len == 8B after net hdr
  > skb_reset_mac_len(skb); // mac len = net hdr - mac hdr == (u16) -8 == 65528
  > [..]
  > skb_mac_gso_segment(skb, ..)

  Link: http://lkml.kernel.org/r/CAF=yD-KeAcTSOn4AxirAxL8m7QAS8GBBe1w09eziYwvPbbUeYA@mail.gmail.com
  Reported-by: syzbot+7b9ed9872dab8c32305d@syzkaller.appspotmail.com
  Fixes: c411ed854584 ("nsh: add GSO support")
  Signed-off-by: Willem de Bruijn
  Acked-by: Jiri Benc
  Signed-off-by: David S. Miller
  Signed-off-by: Greg Kroah-Hartman

  Willem de Bruijn

  2018-07-22 20:28:49 +0800  

19 May, 2018

1 commit

• 8151fe686   nsh: fix infinite loop ... Browse Code »

  [ Upstream commit af50e4ba34f4c45e92535364133d4deb5931c1c5 ]

  syzbot caught an infinite recursion in nsh_gso_segment().

  Problem here is that we need to make sure the NSH header is of
  reasonable length.

  BUG: MAX_LOCK_DEPTH too low!
  turning off the locking correctness validator.
  depth: 48 max: 48!
  48 locks held by syz-executor0/10189:
  #0: (ptrval) (rcu_read_lock_bh){....}, at: __dev_queue_xmit+0x30f/0x34c0 net/core/dev.c:3517
  #1: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #1: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #2: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #2: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #3: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #3: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #4: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #4: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #5: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #5: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #6: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #6: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #7: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #7: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #8: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #8: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #9: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #9: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #10: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #10: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #11: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #11: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #12: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #12: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #13: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #13: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #14: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #14: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #15: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #15: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #16: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #16: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #17: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #17: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #18: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #18: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #19: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #19: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #20: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #20: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #21: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #21: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #22: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #22: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #23: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #23: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #24: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #24: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #25: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #25: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #26: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #26: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #27: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #27: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #28: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #28: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #29: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #29: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #30: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #30: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #31: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #31: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  dccp_close: ABORT with 65423 bytes unread
  #32: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #32: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #33: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #33: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #34: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #34: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #35: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #35: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #36: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #36: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #37: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #37: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #38: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #38: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #39: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #39: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #40: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #40: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #41: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #41: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #42: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #42: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #43: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #43: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #44: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #44: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #45: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #45: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #46: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #46: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  #47: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline]
  #47: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787
  INFO: lockdep is turned off.
  CPU: 1 PID: 10189 Comm: syz-executor0 Not tainted 4.17.0-rc2+ #26
  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
  Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x1b9/0x294 lib/dump_stack.c:113
  __lock_acquire+0x1788/0x5140 kernel/locking/lockdep.c:3449
  lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920
  rcu_lock_acquire include/linux/rcupdate.h:246 [inline]
  rcu_read_lock include/linux/rcupdate.h:632 [inline]
  skb_mac_gso_segment+0x25b/0x720 net/core/dev.c:2789
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107
  skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792
  __skb_gso_segment+0x3bb/0x870 net/core/dev.c:2865
  skb_gso_segment include/linux/netdevice.h:4025 [inline]
  validate_xmit_skb+0x54d/0xd90 net/core/dev.c:3118
  validate_xmit_skb_list+0xbf/0x120 net/core/dev.c:3168
  sch_direct_xmit+0x354/0x11e0 net/sched/sch_generic.c:312
  qdisc_restart net/sched/sch_generic.c:399 [inline]
  __qdisc_run+0x741/0x1af0 net/sched/sch_generic.c:410
  __dev_xmit_skb net/core/dev.c:3243 [inline]
  __dev_queue_xmit+0x28ea/0x34c0 net/core/dev.c:3551
  dev_queue_xmit+0x17/0x20 net/core/dev.c:3616
  packet_snd net/packet/af_packet.c:2951 [inline]
  packet_sendmsg+0x40f8/0x6070 net/packet/af_packet.c:2976
  sock_sendmsg_nosec net/socket.c:629 [inline]
  sock_sendmsg+0xd5/0x120 net/socket.c:639
  __sys_sendto+0x3d7/0x670 net/socket.c:1789
  __do_sys_sendto net/socket.c:1801 [inline]
  __se_sys_sendto net/socket.c:1797 [inline]
  __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1797
  do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

  Fixes: c411ed854584 ("nsh: add GSO support")
  Signed-off-by: Eric Dumazet
  Cc: Jiri Benc
  Reported-by: syzbot
  Acked-by: Jiri Benc
  Signed-off-by: David S. Miller
  Signed-off-by: Greg Kroah-Hartman

  Eric Dumazet

  2018-05-19 16:20:26 +0800  

30 Aug, 2017

1 commit

• c411ed854   nsh: add GSO support ... Browse Code »

  Add a new nsh/ directory. It currently holds only GSO functions but more
  will come: in particular, code shared by openvswitch and tc to manipulate
  NSH headers.

  For now, assume there's no hardware support for NSH segmentation. We can
  always introduce netdev->nsh_features later.

  Signed-off-by: Jiri Benc
  Signed-off-by: David S. Miller

  Jiri Benc

  2017-08-30 06:16:52 +0800