[dpdk-users] SSL-Packet

[dpdk-users] SSL-Packet

[Konstantinos Schoinas]

Hello,

Can somebody tell me how to cast a tcp packet to an ssl packet?

I tried these lines but i dont things they are completely right.

Struct ssl_record {
    uint8_t type;
    uint16_t version;
    uint16_t length;
}


tcp = (struct tcp_hdr *)(ip + 1);
ssl = (struct ssl_record *)(tcp + 1);

Re: [dpdk-users] SSL-Packet

[Matt Laswell]

At a minimum, you're going to want to account for options in the TCP and IP
headers.  A better way would be to do a little parsing of the IP header to
get the header length field, then using that to find the start of the TCP
header, etc.

--
Matt Laswell
infinite io, inc.

On Wed, Aug 1, 2018 at 5:20 AM, Konstantinos Schoinas <ece8537@upnet.gr>
wrote:

> Hello,
>
> Can somebody tell me how to cast a tcp packet to an ssl packet?
>
> I tried these lines but i dont things they are completely right.
>
> Struct ssl_record {
>    uint8_t type;
>    uint16_t version;
>    uint16_t length;
> }
>
>
> tcp = (struct tcp_hdr *)(ip + 1);
> ssl = (struct ssl_record *)(tcp + 1);
>
>

Re: [dpdk-users] SSL-Packet

[Shyam Shrivastav]

Assuming mbuf data includes ethernet header

        struct ipv4_hdr *iphdr = rte_pktmbuf_mtod_offset(pkt,
                            struct ipv4_hdr *,
                            sizeof(struct ether_hdr));

        uint32_t ihlen = (iphdr->version_ihl & 0x0f)*4;

      struct tcp_hdr *th = (struct tcp_hdr *)((char *)iphdr + ihlen);

     uint32_t thlen = (th->data_off & 0xf0)*4;

      struct ssl_recrod *ssl = ( struct ssl_recrod *) ((char *)th + thlen);




On Wed, Aug 1, 2018 at 6:44 PM, Matt Laswell <laswell@infinite.io> wrote:

> At a minimum, you're going to want to account for options in the TCP and IP
> headers.  A better way would be to do a little parsing of the IP header to
> get the header length field, then using that to find the start of the TCP
> header, etc.
>
> --
> Matt Laswell
> infinite io, inc.
>
> On Wed, Aug 1, 2018 at 5:20 AM, Konstantinos Schoinas <ece8537@upnet.gr>
> wrote:
>
> > Hello,
> >
> > Can somebody tell me how to cast a tcp packet to an ssl packet?
> >
> > I tried these lines but i dont things they are completely right.
> >
> > Struct ssl_record {
> >    uint8_t type;
> >    uint16_t version;
> >    uint16_t length;
> > }
> >
> >
> > tcp = (struct tcp_hdr *)(ip + 1);
> > ssl = (struct ssl_record *)(tcp + 1);
> >
> >
>