• Cyrill Gorcunov's avatar
    net: ip, diag -- Add diag interface for raw sockets · 432490f9
    Cyrill Gorcunov authored
    In criu we are actively using diag interface to collect sockets
    present in the system when dumping applications. And while for
    unix, tcp, udp[lite], packet, netlink it works as expected,
    the raw sockets do not have. Thus add it.
    
    v2:
     - add missing sock_put calls in raw_diag_dump_one (by eric.dumazet@)
     - implement @destroy for diag requests (by dsa@)
    
    v3:
     - add export of raw_abort for IPv6 (by dsa@)
     - pass net-admin flag into inet_sk_diag_fill due to
       changes in net-next branch (by dsa@)
    
    v4:
     - use @pad in struct inet_diag_req_v2 for raw socket
       protocol specification: raw module carries sockets
       which may have custom protocol passed from socket()
       syscall and sole @sdiag_protocol is not enough to
       match underlied ones
     - start reporting protocol specifed in socket() call
       when sockets are raw ones for the same reason: user
       space tools like ss may parse this attribute and use
       it for socket matching
    
    v5 (by eric.dumazet@):
     - use sock_hold in raw_sock_get instead of atomic_inc,
       we're holding (raw_v4_hashinfo|raw_v6_hashinfo)->lock
       when looking up so counter won't be zero here.
    
    v6:
     - use sdiag_raw_protocol() helper which will access @pad
       structure used for raw sockets protocol specification:
       we can't simply rename this member without breaking uapi
    
    v7:
     - sine sdiag_raw_protocol() helper is not suitable for
       uapi lets rather make an alias structure with proper
       names. __check_inet_diag_req_raw helper will catch
       if any of structure unintentionally changed.
    
    CC: David S. Miller <davem@davemloft.net>
    CC: Eric Dumazet <eric.dumazet@gmail.com>
    CC: David Ahern <dsa@cumulusnetworks.com>
    CC: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
    CC: James Morris <jmorris@namei.org>
    CC: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
    CC: Patrick McHardy <kaber@trash.net>
    CC: Andrey Vagin <avagin@openvz.org>
    CC: Stephen Hemminger <stephen@networkplumber.org>
    Signed-off-by: default avatarCyrill Gorcunov <gorcunov@openvz.org>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    432490f9
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