Hi Dave, Sorry to bother you again, I am looking for the VLIB_RX and receiving interface only, I will explain the scenario below, I have a plugin, this plugin attached to the device_Input and runs before ethernet_input. In the plugin I am checking is this packet is ICMP, and is it dstinited to the received interface, if it destined to the received interface, we just fwd to normal VPP processing.
As I told in my original email, the same packet shows two different addresses, even the index is the same for both cases and same index we can see in the "show inter" The Packet trace is also the same for the both versions. I tried with a physical interface, it also gave the same set interface ip add HundredGigabitEthernet12/0/0 192.168.198.2/24 set interface state HundredGigabitEthernet12/0/0 up set interface ip addr HundredGigabitEthernet12/0/0 2001:5b0:ffff:7cf0::98fc/64 set interface state HundredGigabitEthernetd8/0/0 up set interface ip addr HundredGigabitEthernetd8/0/0 192.168.200.2/24 I am getting the 192.168.200.2 for the sw_if_idx=1 only. Is there any other way, I can get an IP Address from the vlib_buffer(b)? Coming to VLIB_TX, We are going to fill the VLIB_TX from a hash map we are maintaining in our plugin depending on the packet type. Any thoughts will help us. //Ravi On Fri, Jun 19, 2020 at 2:57 PM Dave Barach (dbarach) <dbar...@cisco.com> wrote: > HundredGigabitEthernet12/0/0 (sw_if_index=1) has the ip address > 192.168.198.2. The calculation shown in your original email is producing > 192.168.198.2, which seems right to me. > > > > You’ve looked up the ip address of the rx interface, which may not be what > you had in mind. > > > > The packet got nowhere near ip4-lookup -> ip4-rewrite, which would set > vlib_buffer(b)->sw_if_index[VLIB_*TX*] to the tx interface sw_if_index. > > > > HTH... Dave > > > > *From:* RaviKiran Veldanda <ravi.jup...@gmail.com> > *Sent:* Friday, June 19, 2020 1:47 PM > *To:* Dave Barach (dbarach) <dbar...@cisco.com> > *Subject:* Re: [discuss] sw_if_index in vent_buffer giving wrong IP > address with ip_interface_address_get_address > > > > Yes Dave, > > I did all the things you suggested and the packet is coming on > HundredGigabitEthernet12/0/0 and I am just getting the packets for that > interface only. > > Please find details below: > > Packet 1 > > 00:02:29:382622: dpdk-input > HundredGigabitEthernet12/0/0 rx queue 0 > buffer 0x92556: current data 0, length 60, buffer-pool 0, ref-count 1, > totlen-nifb 0, trace handle 0x0 > ext-hdr-valid > l4-cksum-computed l4-cksum-correct > PKT MBUF: port 0, nb_segs 1, pkt_len 60 > buf_len 2176, data_len 60, ol_flags 0x0, data_off 128, phys_addr > 0x88895600 > packet_type 0x1 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0 > rss 0x0 fdir.hi 0x0 fdir.lo 0x0 > Packet Types > RTE_PTYPE_L2_ETHER (0x0001) Ethernet packet > 0x0027: 3c:2c:30:65:54:31 -> 01:80:c2:00:00:00 > 00:02:29:437741: ipgw_ent > IPGW_ENT: sw_if_index 1, next index 0 > new src 3c:2c:30:65:54:31 -> new dst 01:80:c2:00:00:00 > 00:02:29:437762: ethernet-input > 0x0027: 3c:2c:30:65:54:31 -> 01:80:c2:00:00:00 > 00:02:29:437764: llc-input > LLC bpdu -> bpdu > 00:02:29:437770: error-drop > rx:HundredGigabitEthernet12/0/0 > 00:02:29:437771: drop > llc-input: unknown llc ssap/dsap > > > > The Commands: > > > > set interface ip add HundredGigabitEthernet12/0/0 192.168.198.2/24 > set interface state HundredGigabitEthernet12/0/0 up > set interface ip addr HundredGigabitEthernet12/0/0 > 2001:5b0:ffff:7cf0::98fc/64 > create interface memif id 0 socket-id 0 master > set interface state memif0/0 up > set interface ip add memif0/0 192.168.1.3/24 > set interface ip addr memif0/0 2001:5b0:ffff:7cf1::98fc/64 > > > I believe there is some problem with this index in code.Please let us know > your views. > > > > //Ravi > > > > On Fri, Jun 19, 2020 at 10:38 AM Dave Barach (dbarach) <dbar...@cisco.com> > wrote: > > If the packet was received on HundredGigabitEthernet12/0/0, you should get > 192.168.198.2. If it was received on memif0/0 you should get 192.168.1.3. > "trace add dpdk-input" [or send pkts, then "show trace". If that produces > nothing, s/dpdk-input/memif-input/ or whatever the memif input node is > called. > > > > Use "show int addr" / "show int" to determine the sw_if_index to name > mapping, and to display the interface ip addresses. > > > ------------------------------ > > *From:* disc...@lists.fd.io <disc...@lists.fd.io> on behalf of > ravi.jup...@gmail.com <ravi.jup...@gmail.com> > *Sent:* Thursday, June 18, 2020 3:54 PM > *To:* disc...@lists.fd.io <disc...@lists.fd.io> > *Subject:* [discuss] sw_if_index in vent_buffer giving wrong IP address > with ip_interface_address_get_address > > > > [Edited Message Follows] > > Hi Team, > > I am writing a plugin and my plugin is attached to device_input, so that I > can receive all the traffic. > > In my plugin, I am checking the headers and deciding to forward to my > application or to the Native VPP. This is working fine, However ICMP case I > have one requirement to check is it destined to Interface I attached my > plugin or some other IP, So to check that I am using following APIs, > > I am receiving packets and doing following things to get the IP address, > > *sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];* > > *ip4_main_t *im = &ip4_main;* > > > * ip_lookup_main_t *lm = &im->lookup_main; ip_interface_address_t > *if_add = pool_elt_at_index (lm->if_address_pool, if_index); ip4_address_t > *if_ip = ip_interface_address_get_address (lm, if_add);* > > I am getting IP Address but the IP Address I am getting is something > different, > > For Example: > > In VPPCTL If I create the interfaces in the following order: > > *set interface ip add HundredGigabitEthernet12/0/0 192.168.198.2/24 > <http://192.168.198.2/24>* > > > > > > * set interface state HundredGigabitEthernet12/0/0 up set interface ip > addr HundredGigabitEthernet12/0/0 2001:5b0:ffff:7cf0::98fc/64 create > interface memif id 0 socket-id 0 master set interface state memif0/0 up > set interface ip add memif0/0 192.168.1.3/24 <http://192.168.1.3/24> set > interface ip addr memif0/0 2001:5b0:ffff:7cf1::98fc/64* > > I am getting IP Address as 192.168.1.3. > > If I am creating interfaces in the following order: > > * create interface memif id 0 socket-id 0 master* > > > * set interface state memif0/0 up set interface ip add > memif0/0 192.168.1.3/24 <http://192.168.1.3/24> set interface ip addr > memif0/0 2001:5b0:ffff:7cf1::98fc/64* > > *set interface ip add HundredGigabitEthernet12/0/0 192.168.198.2/24 > <http://192.168.198.2/24>* > > * set interface state HundredGigabitEthernet12/0/0 up* > * set interface ip addr HundredGigabitEthernet12/0/0 > 2001:5b0:ffff:7cf0::98fc/64* > > > > I am getting IP Address as 192.168.198.2. > > But in both cases the sw_if_index is same and my plugin attached to th*e > HundredGigabitEthernet12/0/0 only. I am expecting IP address of this but > its getting the order I created.* > > So My questions are > > 1> How to get IP address of a interface from sw_if_index0? > > 2> Can you please let me know if you find any issue in my code to get the > IP Address? > > 3> Is there any better method to get IP address from the buffer using any > other parameter? I needed IP address of interface the packet received. > > > > Regards, > > Ravi. > >
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