Hi Rupseh, Interfaces that are not ip6 enabled show these features enabled:
ip6-multicast: ip6-not-enabled ip6-unicast: ip6-not-enabled it’s the ip6-not-enabled node/feature that is enabled on the interface as an input feature that drops the packets. /neale De : <[email protected]> au nom de Rupesh Raghuvaran <[email protected]> Date : mardi 19 février 2019 à 18:06 À : "[email protected]" <[email protected]> Objet : [vpp-dev] VPP coredump on handling IPv6 mDNS packets on interface with ipv6 not enabled explicilty Missed to do a reply all, adding vpp-dev back Thanks Rupesh ---------- Forwarded message --------- From: Rupesh Raghuvaran <[email protected]<mailto:[email protected]>> Date: Tue, Feb 19, 2019 at 10:02 PM Subject: Re: [vpp-dev] VPP coredump on handling IPv6 mDNS packets on interface with ipv6 not enabled explicilty To: Neale Ranns (nranns) <[email protected]<mailto:[email protected]>> Hi Neale,e I could not spot the specific code in ip6-input which drops the packet if the rx interface is not ipv6 enabled. Could you please point that to me. Please find the requested information below DBGvpp# show interface loop1 Name Idx State MTU (L3/IP4/IP6/MPLS) Counter Count loop1 5 up 9000/0/0/0 rx packets 2617 rx bytes 130415 tx packets 2068 tx bytes 111686 drops 3245 punt 170 ip4 240 DBGvpp# show interface address GigabitEthernet0/14/0 (up): L2 bridge bd-id 1 idx 1 shg 0 GigabitEthernet0/14/1 (dn): GigabitEthernet0/14/2 (up): L2 bridge bd-id 1 idx 1 shg 0 local0 (dn): loop1 (up): L2 bridge bd-id 1 idx 1 shg 0 bvi L3 192.168.10.128/24<http://192.168.10.128/24> tuntap-0 (up): DBGvpp# DBGvpp# sh ip6 interface DBGvpp# sh ip6 interface loop1 show ip6 interface: IPv6 not enabled on interface DBGvpp# show int feat loop1 Feature paths configured on loop1... nsh-output: none configured mpls-output: none configured mpls-input: mpls-not-enabled ip6-drop: none configured ip6-punt: none configured ip6-local: none configured ip6-output: none configured ip6-multicast: none configured ip6-unicast: none configured ip4-drop: none configured ip4-punt: none configured ip4-local: none configured ip4-output: none configured ip4-multicast: none configured ip4-unicast: l2-output-nonip: none configured l2-input-nonip: none configured l2-output-ip6: none configured l2-input-ip6: none configured l2-output-ip4: none configured l2-input-ip4: none configured ethernet-output: none configured interface-output: none configured device-input: none configured l2-input: FWD (l2-fwd) UU_FLOOD (l2-flood) FLOOD (l2-flood) l2-output: OUTPUT (interface-output) DBGvpp# Thanks Rupesh On Tue, Feb 19, 2019 at 9:43 PM Neale Ranns (nranns) <[email protected]<mailto:[email protected]>> wrote: Hi Rupesh, An IPv6 packet arriving on an interface that is not IPv6 enabled should be dropped in ip6-input. Can you please show me: sh int feat loop0 sh ip6 interface loop0 local0 is a special case. Think of it as a means for VPP to consume the ID 0 so that we can be sure that no other interface can use that ID. No packets should tx nor rx on local0. /neale De : <[email protected]<mailto:[email protected]>> au nom de Rupesh Raghuvaran <[email protected]<mailto:[email protected]>> Date : mardi 19 février 2019 à 16:06 À : "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Objet : [vpp-dev] VPP coredump on handling IPv6 mDNS packets on interface with ipv6 not enabled explicilty Hi, The vpp core observed with the following trace, this seems to occur when a mDNS ipv6 packet is getting handled in the mfib_forward_lookup. In the mfib_lookup, access to ip6_main.mfib_index_by_sw_if_index[sw_index] results in assertion failure as mfib_index_by_sw_if_index in not yet initialized, note the sw_index is that of a loopback interface created and added to the bridge domain. Note ipv6 is not explicitly enabled for this loopback interface. The loopack interface vrf is set to default 0 using the set_table api with is_ipv6 set as 0. Earlier without interface set table setting and enabling the dhcp client on the interface used to result in assertion on ipv4_main.fib_index_by_sw_if_index ip4_lookup_inline function. My understanding so far regarding the issue is that the ip6 is enabled for the “local0” interface using the ip6_sw_interface_enable_disable from vnet_main_init unconditionally. This leads to the ip6-input feature processing enabled. But note that case does not invoke a ip6_add_del_address function for local0 , which would set up the fib and mfib and invoke vec_validate for the mfib_index_by_sw_if_index that would initialize the vector. I am not able to find any code in ip6-input that would look up the ip6_main.ip_enabled_by_sw_index[sw_index] before passing the frame for lookup. Is there any mechanism currently to handle the buffers only if the interface interface has ipv6 enabled else drop stating that ipv6 not enabled on the interface ? Should local0 interface explicitly enable ip4/ip6 implicitly or should this be driven by some configuration ? The device has two ethernet interface bound to the vpp by specifying the pci-id in startup .conf, the ethernet interfaces are added to a bridge-domain 1 and an additional loopback interface is added for l3. please see the show interfaces and show bridge domain configuration below. Please see the stack trace and other details below. Looking for valuable inputs regarding this. Thanks in advance. Thanks Rupesh (gdb) core-file vpp_main_core_6_20691 [New LWP 20691] [New LWP 20693] Core was generated by `/usr/bin/vpp -c /etc/vpp/startup.conf'. Program terminated with signal SIGABRT, Aborted. #0 0x0000003b00833bff in ?? () [Current thread is 1 (LWP 20691)] (gdb) set solib-search-path lib:usr/lib warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available. (gdb) bt #0 __GI_raise (sig=sig@entry=6) at /usr/src/debug/glibc/2.26-r0/git/sysdeps/unix/sysv/linux/raise.c:51 #1 0x0000003b00834fe7 in __GI_abort () at /usr/src/debug/glibc/2.26-r0/git/stdlib/abort.c:90 #2 0x00000000004077cb in os_exit (code=1) at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vpp/vnet/main.c:359 #3 0x0000003b032acbd9 in unix_signal_handler (signum=6, si=0x7f57ef5ff470, uc=0x7f57ef5ff340) at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vlib/unix/main.c:156 #4 <signal handler called> #5 __GI_raise (sig=sig@entry=6) at /usr/src/debug/glibc/2.26-r0/git/sysdeps/unix/sysv/linux/raise.c:51 #6 0x0000003b00834fe7 in __GI_abort () at /usr/src/debug/glibc/2.26-r0/git/stdlib/abort.c:90 #7 0x0000000000407786 in os_panic () at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vpp/vnet/main.c:335 #8 0x0000003b01c3a33d in debugger () at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vppinfra/error.c:84 #9 0x0000003b01c3a70c in _clib_error (how_to_die=2, function_name=0x0, line_number=0, fmt=0x3b046d8bb0 "%s:%d (%s) assertion `%s' fails") at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vppinfra/error.c:143 #10 0x0000003b0442315e in mfib_forward_lookup (vm=0x3b034dc300 <vlib_global_main>, node=0x7f57ef1fef40, frame=0x7f57ef21a780, is_v4=0) at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vnet/mfib/mfib_forward.c:165 #11 0x0000003b04423405 in ip6_mfib_forward_lookup (vm=0x3b034dc300 <vlib_global_main>, node=0x7f57ef1fef40, frame=0x7f57ef21a780) at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vnet/mfib/mfib_forward.c:216 #12 0x0000003b03257314 in dispatch_node (vm=0x3b034dc300 <vlib_global_main>, node=0x7f57ef1fef40, type=VLIB_NODE_TYPE_INTERNAL, dispatch_state=VLIB_NODE_STATE_POLLING, frame=0x7f57ef21a780, last_time_stamp=826527506884080) at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vlib/main.c:1201 #13 0x0000003b03257aac in dispatch_pending_node (vm=0x3b034dc300 <vlib_global_main>, pending_frame_index=7, last_time_stamp=826527506884080) at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vlib/main.c:1368 #14 0x0000003b0325944c in vlib_main_or_worker_loop (vm=0x3b034dc300 <vlib_global_main>, is_main=1) at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vlib/main.c:1793 #15 0x0000003b03259cfa in vlib_main_loop (vm=0x3b034dc300 <vlib_global_main>) at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vlib/main.c:1895 #16 0x0000003b0325a8b9 in vlib_main (vm=0x3b034dc300 <vlib_global_main>, input=0x7f57ef5fffa0) at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vlib/main.c:2084 #17 0x0000003b032ae125 in thread0 (arg=253458498304) at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vlib/unix/main.c:606 #18 0x0000003b01c5a274 in clib_calljmp () at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vppinfra/longjmp.S:123 #19 0x00007ffc9ad708e0 in ?? () #20 0x0000003b032ae5a0 in vlib_unix_main (argc=37, argv=0x90a4d0) at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vlib/unix/main.c:675 #21 0x00000000004072c6 in main (argc=37, argv=0x90a4d0) at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vpp/vnet/main.c:274 (gdb) frame 10 #10 0x0000003b0442315e in mfib_forward_lookup (vm=0x3b034dc300 <vlib_global_main>, node=0x7f57ef1fef40, frame=0x7f57ef21a780, is_v4=0) at /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vnet/mfib/mfib_forward.c:165 165 /home/rraghuvaran/cnwcl-jan19/poky/build/tmp/work/core2-64-poky-linux/vpp/19.01-r0/git/src/vnet/mfib/mfib_forward.c: No such file or directory. (gdb) info locals ip0 = 0x3b03254dd8 <vlib_node_runtime_update_stats+357> mfei0 = 32599 p0 = 0x7f53eed90680 fib_index0 = 0 pi0 = 549914 n_left_from = 0 n_left_to_next = 255 from = 0x7f57ef21a794 to_next = 0x7f57ef21ac14 __FUNCTION__ = "mfib_forward_lookup" (gdb) p/x (ethernet_header_t *)p0->data $3 = 0x7f53eed90780 (gdb) p/x *(ethernet_header_t *)p0->data $4 = {dst_address = {0x33, 0x33, 0x0, 0x0, 0x0, 0xfb}, src_address = {0xb4, 0x96, 0x91, 0x6, 0x35, 0x3}, type = 0xdd86} (gdb) $5 = {dst_address = {0x33, 0x33, 0x0, 0x0, 0x0, 0xfb}, src_address = {0xb4, 0x96, 0x91, 0x6, 0x35, 0x3}, type = 0xdd86} (gdb) p/x *(ip6_header_t *)(p0->data+p0->current_data) $6 = {ip_version_traffic_class_and_flow_label = 0x56070160, payload_length = 0x3500, protocol = 0x11, hop_limit = 0xff, src_address = {as_u8 = {0xfe, 0x80, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xb6, 0x96, 0x91, 0xff, 0xfe, 0x6, 0x35, 0x3}, as_u16 = {0x80fe, 0x0, 0x0, 0x0, 0x96b6, 0xff91, 0x6fe, 0x335}, as_u32 = {0x80fe, 0x0, 0xff9196b6, 0x33506fe}, as_u64 = {0x80fe, 0x33506feff9196b6}, as_uword = {0x80fe, 0x33506feff9196b6}}, dst_address = {as_u8 = { 0xff, 0x2, 0x0 <repeats 13 times>, 0xfb}, as_u16 = {0x2ff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xfb00}, as_u32 = {0x2ff, 0x0, 0x0, 0xfb000000}, as_u64 = { 0x2ff, 0xfb00000000000000}, as_uword = {0x2ff, 0xfb00000000000000}}} (gdb) p ip6_main->mfib_index_by_sw_if_index $7 = (u32 *) 0x0 (gdb) p ip6_main->fib_index_by_sw_if_index $8 = (u32 *) 0x7f57ef20f39c (gdb) p ip6_main->fib_index_by_sw_if_index[0] $9 = 0 (gdb) p ip6_main->ip_enabled_by_sw_if_index[0] $10 = 1 '\001' (gdb) p ip6_main->ip_enabled_by_sw_if_index[1] $11 = 0 '\000' (gdb) p ip6_main->ip_enabled_by_sw_if_index[5] $12 = 186 '\272' (gdb) p ip6_main $13 = {ip6_table = {{ip6_hash = {buckets = 0x7f53aa7f0000, alloc_lock = 0x7f53aa870000, working_copies = 0x0, working_copy_lengths = 0x0, saved_bucket = {{{ offset = 0, lock = 0, linear_search = 0, log2_pages = 0, refcnt = 0}, as_u64 = 0}}, nbuckets = 65536, log2_nbuckets = 16, name = 0x3b0461648f "ip6 FIB fwding table", freelists = 0x7f57eefeb02c, sh = {alloc_arena_next = 524608, alloc_arena_size = 33554432, alloc_lock_as_u64 = 0, buckets_as_u64 = 0, freelists_as_u64 = 0, nbuckets = 0, ready = 0, pad = {0, 0}}, alloc_arena = 139997319462912, fmt_fn = 0x0}, non_empty_dst_address_length_bitmap = 0x7f57ef0d683c, prefix_lengths_in_search_order = 0x7f57eefd9adc "\n", dst_address_length_refcounts = {1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0 <repeats 118 times>}}, {ip6_hash = {buckets = 0x7f53a87f0000, alloc_lock = 0x7f53a8870000, working_copies = 0x0, working_copy_lengths = 0x0, saved_bucket = {{{offset = 0, lock = 0, linear_search = 0, log2_pages = 0, refcnt = 0}, as_u64 = 0}}, nbuckets = 65536, log2_nbuckets = 16, name = 0x3b046164a4 "ip6 FIB non-fwding table", freelists = 0x7f57eefea3cc, sh = {alloc_arena_next = 524608, alloc_arena_size = 33554432, alloc_lock_as_u64 = 0, buckets_as_u64 = 0, freelists_as_u64 = 0, nbuckets = 0, ready = 0, pad = {0, 0}}, alloc_arena = 139997285908480, fmt_fn = 0x0}, non_empty_dst_address_length_bitmap = 0x7f57ef0d687c, prefix_lengths_in_search_order = 0x7f57eefd970c "\n", dst_address_length_refcounts = {1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0 <repeats 118 times>}}}, ip6_mtable = {ip6_mhash = {buckets = 0x7f53a67f0000, alloc_lock = 0x7f53a6870000, working_copies = 0x0, working_copy_lengths = 0x0, saved_bucket = {{{offset = 0, lock = 0, linear_search = 0, log2_pages = 0, refcnt = 0}, as_u64 = 0}}, nbuckets = 65536, log2_nbuckets = 16, name = 0x3b046164bd "ip6 mFIB table", freelists = 0x7f57eefbe90c, sh = { alloc_arena_next = 525312, alloc_arena_size = 33554432, alloc_lock_as_u64 = 0, buckets_as_u64 = 0, freelists_as_u64 = 0, nbuckets = 0, ready = 0, pad = {0, 0}}, alloc_arena = 139997252354048, fmt_fn = 0x0}, non_empty_dst_address_length_bitmap = 0x7f57ef0d70ac, prefix_lengths_in_search_order = 0x7f57eefd309c, dst_address_length_refcounts = {1, 0 <repeats 103 times>, 1, 0 <repeats 23 times>, 3, 0 <repeats 128 times>}}, lookup_main = {if_address_pool = 0x0, address_to_if_address_index = {key_vector_or_heap = 0x0, key_vector_free_indices = 0x0, key_tmps = 0x0, n_key_bytes = 20, hash_seed = 0, hash = 0x7f57ef0ce16c, format_key = 0x0}, if_address_pool_index_by_sw_if_index = 0x7f57ef20f3dc, classify_table_index_by_sw_if_index = 0x0, mcast_feature_arc_index = 7 '\a', ucast_feature_arc_index = 8 '\b', output_feature_arc_index = 6 '\006', fib_result_n_bytes = 8, fib_result_n_words = 0, is_ip6 = 1, format_address_and_length = 0x3b03d2a7eb <format_ip6_address_and_length>, local_next_by_ip_protocol = '\001' <repeats 17 times>, "\002", '\001' <repeats 26 times>, "\004\001\001\006\001\001\001\001\001\001\001\001\001\001\003", '\001' <repeats 56 times>, "\005", '\001' <repeats 140 times>, builtin_protocol_by_ip_protocol = '\002' <repeats 17 times>, "\000", '\002' <repeats 40 times>, "\001", '\002' <repeats 197 times>}, fibs = 0x7f57eeeeb2dc, v6_fibs = 0x7f57ef0d6780, mfibs = 0x7f57ef0c4900, fib_masks = {{as_u8 = '\000' <repeats 15 times>, as_u16 = {0, 0, 0, 0, 0, 0, 0, -----------snip--- as_u8 = '\377' <repeats 15 times>, "\376", as_u16 = {65535, 65535, 65535, 65535, 65535, 65535, 65535, 65279}, as_u32 = {4294967295, 4294967295, 4294967295, 4278190079}, as_u64 = {18446744073709551615, 18374686479671623679}, as_uword = {18446744073709551615, 18374686479671623679}}, { ---Type <return> to continue, or q <return> to quit--- as_u8 = '\377' <repeats 16 times>, as_u16 = {65535, 65535, 65535, 65535, 65535, 65535, 65535, 65535}, as_u32 = {4294967295, 4294967295, 4294967295, 4294967295}, as_u64 = {18446744073709551615, 18446744073709551615}, as_uword = {18446744073709551615, 18446744073709551615}}}, fib_index_by_sw_if_index = 0x7f57ef20f39c, mfib_index_by_sw_if_index = 0x0, ip_enabled_by_sw_if_index = 0x7f57eefb1a8c "\001", fib_index_by_table_id = 0x7f57eeb5fd3c, mfib_index_by_table_id = 0x7f57eeff331c, interface_route_adj_index_by_sw_if_index = 0x0, add_del_interface_address_callbacks = 0x7f57ef0d618c, table_bind_callbacks = 0x7f57eefea5ac, discover_neighbor_packet_template = { packet_data = 0x7f57ef0d74bc "`", min_n_buffers_each_alloc = 8, name = 0x0}, lookup_table_nbuckets = 65536, lookup_table_size = 33554432, flow_hash_seed = 3735928559, host_config = {ttl = 64 '@', pad = "\000\000"}, hbh_enabled = 0 '\000', nd_throttle = {time = 0.001, bitmaps = 0x7f57ef1c9bcc, seeds = 0x7f57ef1cb59c, last_seed_change_time = 0x7f57ef1c9c8c}} DBGvpp# show ver vpp v19.04-rc0~178-g6fef74a built by on rraghuvaran-dev at Thu Feb 14 14:20:07 IST 2019 DBGvpp# show interface Name Idx State MTU (L3/IP4/IP6/MPLS) Counter Count GigabitEthernet0/14/0 2 up 1500/0/0/0 rx packets 1706 rx bytes 113473 tx packets 673 tx bytes 41215 drops 1531 tx-error 2 GigabitEthernet0/14/1 3 down 9000/0/0/0 GigabitEthernet0/14/2 4 up 1500/0/0/0 tx-error 2094 local0 0 down 0/0/0/0 drops 1 loop1 5 up 9000/0/0/0 rx packets 1706 rx bytes 89589 tx packets 1350 tx bytes 83718 drops 2098 punt 127 ip4 173 tuntap-0 1 up 0/0/0/0 rx packets 627 rx bytes 48233 tx packets 127 tx bytes 14755 drops 558 ip4 627 DBGvpp# show interface address GigabitEthernet0/14/0 (up): L2 bridge bd-id 1 idx 1 shg 0 GigabitEthernet0/14/1 (dn): GigabitEthernet0/14/2 (up): L2 bridge bd-id 1 idx 1 shg 0 local0 (dn): loop1 (up): L2 bridge bd-id 1 idx 1 shg 0 bvi L3 192.168.10.128/24<http://192.168.10.128/24> tuntap-0 (up): DBGvpp# show bridge-domain 1 detail BD-ID Index BSN Age(min) Learning U-Forwrd UU-Flood Flooding ARP-Term BVI-Intf 1 1 0 off on on flood on off loop1 Interface If-idx ISN SHG BVI TxFlood VLAN-Tag-Rewrite loop1 5 1 0 * * none GigabitEthernet0/14/2 4 1 0 - * none GigabitEthernet0/14/0 2 1 0 - * none DBGvpp# Following is the startup conf unix { nodaemon log /tmp/vpp.log full-coredump cli-listen localhost:5002 } api-segment { gid 0 } tuntap { enable } api-trace { on } cpu { skip-cores 4 } dpdk { dev 0000:00:14.0 dev 0000:00:14.1 dev 0000:00:14.2 }
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