Re: vlan tagged packets and libpcap breakage

[ebiederm () xmission com (Eric W. Biederman)]

Ani Sinha <ani () aristanetworks com> writes:

> > The patch is whitespace damaged.  And one of your test is using ||
> > instead of &&
>
> OK, using alpine now :-)
> > The test should be && not ||.
>
> aargh! I am retarded! Fixed. Hopefully 3rd time is a charm :-)

Acked-by: "Eric W. Biederman" <ebiederm () xmission com>

The code looks ok here.  I don't know what format the tcpdump folks
want patches in.  The typically format is an email with [PATCH] in
the subject.

You indentation now comes through clear.

It is a bit odd that you are indenting with spaces instead of tabs
in a file that is indented with tab.  Again libpcap isn't my code so I
don't care but someone else might.

Eric


> ani
>
>
>  pcap-linux.c |   50 +++++++++++++++++++++++++++++++-------------------
>  1 files changed, 31 insertions(+), 19 deletions(-)
>
> diff --git a/pcap-linux.c b/pcap-linux.c
> index a42c3ac..b2c1a08 100644
> --- a/pcap-linux.c
> +++ b/pcap-linux.c
> @@ -133,6 +133,7 @@ static const char rcsid[] _U_ =
>  #include <sys/utsname.h>
>  #include <sys/mman.h>
>  #include <linux/if.h>
> +#include <linux/if_packet.h>
>  #include <netinet/in.h>
>  #include <linux/if_ether.h>
>  #include <net/if_arp.h>
> @@ -1543,7 +1544,13 @@ pcap_read_packet(pcap_t *handle, pcap_handler callback, u_char *userdata)
>                               continue;
>
>                       aux = (struct tpacket_auxdata *)CMSG_DATA(cmsg);
> -                     if (aux->tp_vlan_tci == 0)
> +#if defined(TP_STATUS_VLAN_VALID)
> +                        if ((aux->tp_vlan_tci == 0) && !(aux->tp_status & TP_STATUS_VLAN_VALID))
> +#else
> +                     if (aux->tp_vlan_tci == 0) /* this is ambigious but without the
> +                                                      TP_STATUS_VLAN_VALID flag, there is
> +                                                      nothing that we can do */
> +#endif
>                               continue;
>
>                       len = packet_len > iov.iov_len ? iov.iov_len : packet_len;
> @@ -3936,7 +3926,12 @@ pcap_read_linux_mmap(pcap_t *handle, int max_packets, pcap_handler callback,
>               }
>
>  #ifdef HAVE_TPACKET2
> -             if (handle->md.tp_version == TPACKET_V2 && h.h2->tp_vlan_tci &&
> +                if ((handle->md.tp_version == TPACKET_V2) &&
> +#if defined(TP_STATUS_VLAN_VALID)
> +                    (h.h2->tp_vlan_tci || (h.h2->tp_status & TP_STATUS_VLAN_VALID)) &&
> +#else
> +                    h.h2->tp_vlan_tci &&
> +#endif
>                   handle->md.vlan_offset != -1 &&
>                   tp_snaplen >= (unsigned int) handle->md.vlan_offset) {
>                       struct vlan_tag *tag;
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