[net-next,0/5] inet: add drop monitor support

Message

Eric Dumazet Oct. 28, 2022, 1:30 p.m. UTC

IPv4 and IPv6 reassembly units are causing false kfree_skb()
notifications. It is time to deal with this issue.

First two patches are changing core networking to better
deal with eventual skb frag_list chains, in respect
of kfree_skb/consume_skb status.

Last three patches are adding three new drop reasons,
and make sure skbs that have been reassembled into
a large datagram are no longer viewed as dropped ones.

Eric Dumazet (5):
  net: dropreason: add SKB_CONSUMED reason
  net: dropreason: propagate drop_reason to skb_release_data()
  net: dropreason: add SKB_DROP_REASON_DUP_FRAG
  net: dropreason: add SKB_DROP_REASON_FRAG_REASM_TIMEOUT
  net: dropreason: add SKB_DROP_REASON_FRAG_TOO_FAR

 include/net/dropreason.h                | 14 ++++++++++++
 include/net/inet_frag.h                 |  6 ++++-
 include/net/ipv6_frag.h                 |  3 ++-
 net/core/skbuff.c                       | 30 ++++++++++++++-----------
 net/ipv4/inet_fragment.c                | 14 ++++++++----
 net/ipv4/ip_fragment.c                  | 19 +++++++++++-----
 net/ipv6/netfilter/nf_conntrack_reasm.c |  2 +-
 net/ipv6/reassembly.c                   | 13 +++++++----
 8 files changed, 71 insertions(+), 30 deletions(-)