Hi Nicolas, Thanks. I tried to test my application with a pcap file I had, but got weird results, so I wrote back the rte_mbufs in pcap format and hex compared it to my input pcap. Only then I noticed that my original pcap had frames that were captured with a length smaller than the frame length.
I guess you can call it pure (bad) luck :) Dror On Thu, Jan 28, 2016 at 8:00 PM, Nicolas Pernas Maradei < nicolas.pernas.maradei at emutex.com> wrote: > Hi Dror, > > Good catch. What you are saying makes sense and it is also explained in > pcap's documentation. Was your setup unusual though? > This might sound like a silly question but I don't remember seeing that > issue and I should have since your fix is correct. > > Nico. > > On 28/01/16 08:09, Dror Birkman wrote: > > The actual captured length is header.caplen, whereas header.len is > the original length on the wire. > > Signed-off-by: Dror Birkman <dror.birkman at lightcyber.com> <dror.birkman at > lightcyber.com> > --- > > > Without this fix, if the captured length is smaller than the original > length on the wire, mbuf will contain incorrect data. > > > drivers/net/pcap/rte_eth_pcap.c | 12 ++++++------ > 1 file changed, 6 insertions(+), 6 deletions(-) > > diff --git a/drivers/net/pcap/rte_eth_pcap.c b/drivers/net/pcap/rte_eth_pcap.c > index f9230eb..1d121f8 100644 > --- a/drivers/net/pcap/rte_eth_pcap.c > +++ b/drivers/net/pcap/rte_eth_pcap.c > @@ -220,25 +220,25 @@ eth_pcap_rx(void *queue, > buf_size = > (uint16_t)(rte_pktmbuf_data_room_size(pcap_q->mb_pool) - > RTE_PKTMBUF_HEADROOM); > > - if (header.len <= buf_size) { > + if (header.caplen <= buf_size) { > /* pcap packet will fit in the mbuf, go ahead and copy > */ > rte_memcpy(rte_pktmbuf_mtod(mbuf, void *), packet, > - header.len); > - mbuf->data_len = (uint16_t)header.len; > + header.caplen); > + mbuf->data_len = (uint16_t)header.caplen; > } else { > /* Try read jumbo frame into multi mbufs. */ > if (unlikely(eth_pcap_rx_jumbo(pcap_q->mb_pool, > mbuf, > packet, > - header.len) == -1)) > + header.caplen) == -1)) > break; > } > > - mbuf->pkt_len = (uint16_t)header.len; > + mbuf->pkt_len = (uint16_t)header.caplen; > mbuf->port = pcap_q->in_port; > bufs[num_rx] = mbuf; > num_rx++; > - rx_bytes += header.len; > + rx_bytes += header.caplen; > } > pcap_q->rx_pkts += num_rx; > pcap_q->rx_bytes += rx_bytes; > > > - no title specified @page { } table { border-collapse:collapse; > border-spacing:0; empty-cells:show } td, th { vertical-align:top; > font-size:12pt;} h1, h2, h3, h4, h5, h6 { clear:both } ol, ul { margin:0; > padding:0;} li { list-style: none; 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