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ipv6/nib: bugfix handle SLLAO on 6LR if ARO is not present #17814

Merged
merged 1 commit into from
Apr 18, 2022
Merged

ipv6/nib: bugfix handle SLLAO on 6LR if ARO is not present #17814

merged 1 commit into from
Apr 18, 2022

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fabian18
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Contribution description

When I was Iooking through the code and was following debug messages, I discovered that the SLLA option in a Neighbor Solicitation is "stored for later handling" but it is never touched again if not also an AR option is present on 6LR.
This can be fixed by removing a break.

Testing procedure

Two nrf52840dk node A and node B running gnrc_networing.
Assign both nodes an ipv6 address.

$A ifconfig 6 add fd00:b:b::1
$B ifconfig 6 add fd00:b:b::2

When B tries to ping A, it sends a multicast NS to ask for the L2 address of the target fd00:b:b::1.
B includes an SLLA option, so A knows the L2 address of B and can reply with a Neighbor Advertisement.
If A does not handle the SLLA option, it does not create a Neighbor Cache Entry for B, so it fails to deliver the NA.
Hence, the ping request of B fails because B did not receive the L2 address of A.

This is node A 
2022-03-16 17:37:26,793 # All up, running the shell now
> 2022-03-16 17:37:26,795 # nib: Handle timer event (ctx = 0x20001388, type = 0x4fc3, now = 319ms)
2022-03-16 17:37:26,797 # nib: lookup ctx = 0x20001388, type = 4fc3
i2022-03-16 17:37:30,932 # nib: Handle packet (icmpv6->type = 133)
2022-03-16 17:37:30,936 # nib: Received valid router solicitation:
2022-03-16 17:37:30,940 #      - Source address: fe80::a4d7:37db:ab10:e97c
2022-03-16 17:37:30,943 #      - Destination address: ff02::2
2022-03-16 17:37:30,950 # nib: Getting on-link node entry (addr = fe80::a4d7:37db:ab10:e97c, iface = 6)
2022-03-16 17:37:30,953 #   No suitable entry found
fconfig
2022-03-16 17:37:32,113 # ifconfig
2022-03-16 17:37:32,119 # Iface  6  HWaddr: 28:38  Channel: 26  NID: 0x23  PHY: O-QPSK 
2022-03-16 17:37:32,123 #           Long HWaddr: 6E:F6:D8:01:53:E3:28:38 
2022-03-16 17:37:32,125 #            State: IDLE 
2022-03-16 17:37:32,130 #           ACK_REQ  L2-PDU:102  MTU:1280  HL:64  RTR  
2022-03-16 17:37:32,132 #           6LO  IPHC  
2022-03-16 17:37:32,135 #           Source address length: 8
2022-03-16 17:37:32,138 #           Link type: wireless
2022-03-16 17:37:32,144 #           inet6 addr: fe80::6cf6:d801:53e3:2838  scope: link  VAL
2022-03-16 17:37:32,146 #           inet6 group: ff02::2
2022-03-16 17:37:32,149 #           inet6 group: ff02::1
2022-03-16 17:37:32,153 #           inet6 group: ff02::1:ffe3:2838
2022-03-16 17:37:32,156 #           inet6 group: ff02::1a
2022-03-16 17:37:32,157 #           
2022-03-16 17:37:32,159 #           Statistics for Layer 2
2022-03-16 17:37:32,163 #             RX packets 1  bytes 43
2022-03-16 17:37:32,167 #             TX packets 4 (Multicast: 4)  bytes 0
2022-03-16 17:37:32,170 #             TX succeeded 3 errors 0
2022-03-16 17:37:32,173 #           Statistics for IPv6
2022-03-16 17:37:32,176 #             RX packets 1  bytes 64
2022-03-16 17:37:32,180 #             TX packets 3 (Multicast: 3)  bytes 178
2022-03-16 17:37:32,183 #             TX succeeded 3 errors 0
2022-03-16 17:37:32,183 # 
> 2022-03-16 17:37:36,100 # nib: Handle timer event (ctx = 0x20001388, type = 0x4fc3, now = 10329ms)
2022-03-16 17:37:36,104 # nib: lookup ctx = 0x20001388, type = 4fc3
2022-03-16 17:37:40,944 # nib: Handle packet (icmpv6->type = 133)
2022-03-16 17:37:40,947 # nib: Received valid router solicitation:
2022-03-16 17:37:40,951 #      - Source address: fe80::a4d7:37db:ab10:e97c
2022-03-16 17:37:40,955 #      - Destination address: ff02::2
2022-03-16 17:37:40,961 # nib: Getting on-link node entry (addr = fe80::a4d7:37db:ab10:e97c, iface = 6)
2022-03-16 17:37:40,964 #   No suitable entry found
ifconfig 6 add fd00:b:b::1/64
2022-03-16 17:37:45,250 # ifconfig 6 add fd00:b:b::1/64
2022-03-16 17:37:45,258 # nib: Allocating off-link-entry entry (next_hop = NULL, iface = 6, pfx = fd00:b:b::1/64)
2022-03-16 17:37:45,259 #   using 0x20000f08
2022-03-16 17:37:45,264 # nib: Allocating on-link node entry (addr = NULL, iface = 6)
2022-03-16 17:37:45,265 #   using 0
2022-03-16 17:37:45,269 # success: added fd00:b:b::1/64 to interface 6
> 2022-03-16 17:37:46,111 # nib: Handle timer event (ctx = 0x20001388, type = 0x4fc3, now = 20339ms)
2022-03-16 17:37:46,114 # nib: lookup ctx = 0x20001388, type = 4fc3
2022-03-16 17:37:54,953 # nib: Handle packet (icmpv6->type = 133)
2022-03-16 17:37:54,956 # nib: Received valid router solicitation:
2022-03-16 17:37:54,960 #      - Source address: fe80::a4d7:37db:ab10:e97c
2022-03-16 17:37:54,964 #      - Destination address: ff02::2
2022-03-16 17:37:54,970 # nib: Getting on-link node entry (addr = fe80::a4d7:37db:ab10:e97c, iface = 6)
2022-03-16 17:37:54,973 #   No suitable entry found
ifco2022-03-16 17:38:00,121 # nib: Handle timer event (ctx = 0x20001388, type = 0x4fc3, now = 34349ms)
2022-03-16 17:38:00,125 # nib: lookup ctx = 0x20001388, type = 4fc3
nfig
2022-03-16 17:38:00,742 # ifconfig
2022-03-16 17:38:00,748 # Iface  6  HWaddr: 28:38  Channel: 26  NID: 0x23  PHY: O-QPSK 
2022-03-16 17:38:00,752 #           Long HWaddr: 6E:F6:D8:01:53:E3:28:38 
2022-03-16 17:38:00,754 #            State: IDLE 
2022-03-16 17:38:00,759 #           ACK_REQ  L2-PDU:102  MTU:1280  HL:64  RTR  
2022-03-16 17:38:00,761 #           6LO  IPHC  
2022-03-16 17:38:00,764 #           Source address length: 8
2022-03-16 17:38:00,767 #           Link type: wireless
2022-03-16 17:38:00,773 #           inet6 addr: fe80::6cf6:d801:53e3:2838  scope: link  VAL
2022-03-16 17:38:00,778 #           inet6 addr: fd00:b:b::1  scope: global  VAL
2022-03-16 17:38:00,780 #           inet6 group: ff02::2
2022-03-16 17:38:00,783 #           inet6 group: ff02::1
2022-03-16 17:38:00,786 #           inet6 group: ff02::1:ffe3:2838
2022-03-16 17:38:00,789 #           inet6 group: ff02::1a
2022-03-16 17:38:00,792 #           inet6 group: ff02::1:ff00:1
2022-03-16 17:38:00,793 #           
2022-03-16 17:38:00,796 #           Statistics for Layer 2
2022-03-16 17:38:00,800 #             RX packets 3  bytes 129
2022-03-16 17:38:00,804 #             TX packets 7 (Multicast: 7)  bytes 0
2022-03-16 17:38:00,807 #             TX succeeded 6 errors 0
2022-03-16 17:38:00,810 #           Statistics for IPv6
2022-03-16 17:38:00,813 #             RX packets 3  bytes 192
2022-03-16 17:38:00,818 #             TX packets 6 (Multicast: 6)  bytes 370
2022-03-16 17:38:00,820 #             TX succeeded 6 errors 0
2022-03-16 17:38:00,821 # 
> 2022-03-16 17:38:08,882 # nib: Handle packet (icmpv6->type = 135)
2022-03-16 17:38:08,886 # nib: Received valid neighbor solicitation:
2022-03-16 17:38:08,889 #      - Target address: fd00:b:b::1
2022-03-16 17:38:08,892 #      - Source address: fd00:b:b::2
2022-03-16 17:38:08,896 #      - Destination address: ff02::1:ff00:1
2022-03-16 17:38:08,899 # nib: Storing SL2AO for later handling
2022-03-16 17:38:08,904 # nib: get next hop link-layer address of fd00:b:b::2%6
2022-03-16 17:38:08,910 # nib: Getting on-link node entry (addr = fd00:b:b::2, iface = 6)
2022-03-16 17:38:08,912 #   No suitable entry found
2022-03-16 17:38:08,916 # nib: fd00:b:b::2 is off-link, resolve route
2022-03-16 17:38:08,920 # nib: get route fd00:b:b::2 for packet 0x20001ad4
2022-03-16 17:38:08,924 # nib: get match for destination fd00:b:b::2 from NIB
2022-03-16 17:38:08,929 # nib: fd00:b:b::/64 => (nil)%6 matches with 126 bits
2022-03-16 17:38:08,931 # nib: best match (126 bits)
2022-03-16 17:38:08,938 # nib: no route to fd00:b:b::2 found or is prefix list entry, search neighbor cache
2022-03-16 17:38:08,943 # nib: prefix list entry => taking dst as next hop
2022-03-16 17:38:08,948 # nib: Getting on-link node entry (addr = fd00:b:b::2, iface = 6)
2022-03-16 17:38:08,951 #   No suitable entry found
2022-03-16 17:38:08,955 # nib: resolve address fd00:b:b::2 by probing neighbors
2022-03-16 17:38:08,961 # nib: Allocating on-link node entry (addr = fd00:b:b::2, iface = 6)
2022-03-16 17:38:08,964 #   0x20001130 is an exact match
2022-03-16 17:38:08,969 # nib: Adding to neighbor cache (addr = fd00:b:b::2, iface = 6)
2022-03-16 17:38:08,975 # nib: queueing (addr = fd00:b:b::2, iface = 6) for potential removal
2022-03-16 17:38:08,980 # nib: Probing nib: lookup ctx = 0x20001130, type = 4fc1
2022-03-16 17:38:08,986 # multicast to fd00:b:b::2's solicited nodes (retrans. timer = 1000ms)
2022-03-16 17:38:09,901 # nib: Handle packet (icmpv6->type = 135)
2022-03-16 17:38:09,905 # nib: Received valid neighbor solicitation:
2022-03-16 17:38:09,908 #      - Target address: fd00:b:b::1
2022-03-16 17:38:09,910 #      - Source address: fd00:b:b::2
2022-03-16 17:38:09,914 #      - Destination address: ff02::1:ff00:1
2022-03-16 17:38:09,918 # nib: Storing SL2AO for later handling
2022-03-16 17:38:09,923 # nib: get next hop link-layer address of fd00:b:b::2%6
2022-03-16 17:38:09,928 # nib: Getting on-link node entry (addr = fd00:b:b::2, iface = 6)
2022-03-16 17:38:09,930 #   Found 0x20001130
2022-03-16 17:38:09,935 # nib: fd00:b:b::2 is in NC, start address resolution
2022-03-16 17:38:09,940 # nib: Getting on-link node entry (addr = fd00:b:b::2, iface = 6)
2022-03-16 17:38:09,942 #   Found 0x20001130
2022-03-16 17:38:09,946 # nib: resolve address fd00:b:b::2 by probing neighbors
2022-03-16 17:38:09,951 # nib: Probing nib: lookup ctx = 0x20001130, type = 4fc1
2022-03-16 17:38:09,960 # multicast to fd00:b:b::2's solicited nodes (skipping since there is already a multicast NS within 1000ms)
2022-03-16 17:38:09,963 # nib: host unreachable
2022-03-16 17:38:09,993 # nib: Handle timer event (ctx = 0x20001130, type = 0x4fc1, now = 44221ms)
2022-03-16 17:38:09,996 # nib: Retransmit neighbor solicitation
2022-03-16 17:38:10,001 # nib: Probing nib: lookup ctx = 0x20001130, type = 4fc1
2022-03-16 17:38:10,007 # multicast to fd00:b:b::2's solicited nodes (retrans. timer = 1000ms)
2022-03-16 17:38:10,924 # nib: Handle packet (icmpv6->type = 135)
2022-03-16 17:38:10,927 # nib: Received valid neighbor solicitation:
2022-03-16 17:38:10,930 #      - Target address: fd00:b:b::1
2022-03-16 17:38:10,933 #      - Source address: fd00:b:b::2
2022-03-16 17:38:10,937 #      - Destination address: ff02::1:ff00:1
2022-03-16 17:38:10,940 # nib: Storing SL2AO for later handling
2022-03-16 17:38:10,945 # nib: get next hop link-layer address of fd00:b:b::2%6
2022-03-16 17:38:10,951 # nib: Getting on-link node entry (addr = fd00:b:b::2, iface = 6)
2022-03-16 17:38:10,952 #   Found 0x20001130
2022-03-16 17:38:10,957 # nib: fd00:b:b::2 is in NC, start address resolution
2022-03-16 17:38:10,963 # nib: Getting on-link node entry (addr = fd00:b:b::2, iface = 6)
2022-03-16 17:38:10,964 #   Found 0x20001130
2022-03-16 17:38:10,969 # nib: resolve address fd00:b:b::2 by probing neighbors
2022-03-16 17:38:10,974 # nib: Probing nib: lookup ctx = 0x20001130, type = 4fc1
2022-03-16 17:38:10,983 # multicast to fd00:b:b::2's solicited nodes (skipping since there is already a multicast NS within 1000ms)
2022-03-16 17:38:10,985 # nib: host unreachable
2022-03-16 17:38:11,013 # nib: Handle timer event (ctx = 0x20001130, type = 0x4fc1, now = 45242ms)
2022-03-16 17:38:11,017 # nib: Retransmit neighbor solicitation
2022-03-16 17:38:11,021 # nib: Probing nib: lookup ctx = 0x20001130, type = 4fc1
2022-03-16 17:38:11,028 # multicast to fd00:b:b::2's solicited nodes (retrans. timer = 1000ms)
2022-03-16 17:38:12,034 # nib: Handle timer event (ctx = 0x20001130, type = 0x4fc1, now = 46262ms)
2022-03-16 17:38:12,037 # nib: Retransmit neighbor solicitation
2022-03-16 17:38:12,043 # nib: remove from neighbor cache (addr = fd00:b:b::2, iface = 6)
2022-03-16 17:38:12,965 # nib: Handle packet (icmpv6->type = 133)
2022-03-16 17:38:12,969 # nib: Received valid router solicitation:
2022-03-16 17:38:12,972 #      - Source address: fe80::a4d7:37db:ab10:e97c
2022-03-16 17:38:12,975 #      - Destination address: ff02::2
2022-03-16 17:38:12,983 # nib: Getting on-link node entry (addr = fe80::a4d7:37db:ab10:e97c, iface = 6)
2022-03-16 17:38:12,985 #   No suitable entry found
2022-03-16 17:38:18,131 # nib: Handle timer event (ctx = 0x20001388, type = 0x4fc3, now = 52359ms)
2022-03-16 17:38:18,135 # nib: lookup ctx = 0x20001388, type = 4fc3
This is node B 
2022-03-16 17:37:21,513 # nib: Handle timer event (ctx = 0x20001388, type = 0x4fc3, now = 539ms)
2022-03-16 17:37:21,514 # nib: lookup ctx = 0x20001388, type = 4fc3
2022-03-16 17:37:25,803 # nib: Handle packet (icmpv6->type = 133)
2022-03-16 17:37:25,807 # nib: Received valid router solicitation:
2022-03-16 17:37:25,812 #      - Source address: fe80::6cf6:d801:53e3:2838
2022-03-16 17:37:25,815 #      - Destination address: ff02::2
2022-03-16 17:37:25,821 # nib: Getting on-link node entry (addr = fe80::6cf6:d801:53e3:2838, iface = 6)
2022-03-16 17:37:25,824 #   No suitable entry found
2022-03-16 17:37:26,100 # nib: Handle packet (icmpv6->type = 133)
2022-03-16 17:37:26,104 # nib: Received valid router solicitation:
2022-03-16 17:37:26,108 #      - Source address: fe80::6cf6:d801:53e3:2838
2022-03-16 17:37:26,111 #      - Destination address: ff02::2
2022-03-16 17:37:26,118 # nib: Getting on-link node entry (addr = fe80::6cf6:d801:53e3:2838, iface = 6)
2022-03-16 17:37:26,120 #   No suitable entry found
2022-03-16 17:37:30,923 # nib: Handle timer event (ctx = 0x20001388, type = 0x4fc3, now = 10549ms)
2022-03-16 17:37:30,926 # nib: lookup ctx = 0x20001388, type = 4fc3
ifconfig
2022-03-16 17:37:34,851 # ifconfig
2022-03-16 17:37:34,856 # Iface  6  HWaddr: 69:7C  Channel: 26  NID: 0x23  PHY: O-QPSK 
2022-03-16 17:37:34,860 #           Long HWaddr: A6:D7:37:DB:AB:10:E9:7C 
2022-03-16 17:37:34,863 #            State: IDLE 
2022-03-16 17:37:34,868 #           ACK_REQ  L2-PDU:102  MTU:1280  HL:64  RTR  
2022-03-16 17:37:34,870 #           6LO  IPHC  
2022-03-16 17:37:34,873 #           Source address length: 8
2022-03-16 17:37:34,875 #           Link type: wireless
2022-03-16 17:37:34,881 #           inet6 addr: fe80::a4d7:37db:ab10:e97c  scope: link  VAL
2022-03-16 17:37:34,884 #           inet6 group: ff02::2
2022-03-16 17:37:34,887 #           inet6 group: ff02::1
2022-03-16 17:37:34,890 #           inet6 group: ff02::1:ff10:e97c
2022-03-16 17:37:34,893 #           inet6 group: ff02::1a
2022-03-16 17:37:34,894 #           
2022-03-16 17:37:34,897 #           Statistics for Layer 2
2022-03-16 17:37:34,900 #             RX packets 3  bytes 115
2022-03-16 17:37:34,905 #             TX packets 5 (Multicast: 5)  bytes 0
2022-03-16 17:37:34,908 #             TX succeeded 4 errors 0
2022-03-16 17:37:34,910 #           Statistics for IPv6
2022-03-16 17:37:34,913 #             RX packets 3  bytes 178
2022-03-16 17:37:34,918 #             TX packets 4 (Multicast: 4)  bytes 242
2022-03-16 17:37:34,921 #             TX succeeded 4 errors 0
2022-03-16 17:37:34,921 # 
> 2022-03-16 17:37:36,110 # nib: Handle packet (icmpv6->type = 133)
2022-03-16 17:37:36,114 # nib: Received valid router solicitation:
2022-03-16 17:37:36,118 #      - Source address: fe80::6cf6:d801:53e3:2838
2022-03-16 17:37:36,121 #      - Destination address: ff02::2
2022-03-16 17:37:36,128 # nib: Getting on-link node entry (addr = fe80::6cf6:d801:53e3:2838, iface = 6)
2022-03-16 17:37:36,130 #   No suitable entry found
2022-03-16 17:37:40,933 # nib: Handle timer event (ctx = 0x20001388, type = 0x4fc3, now = 20559ms)
2022-03-16 17:37:40,937 # nib: lookup ctx = 0x20001388, type = 4fc3
2022-03-16 17:37:46,121 # nib: Handle packet (icmpv6->type = 133)
2022-03-16 17:37:46,125 # nib: Received valid router solicitation:
2022-03-16 17:37:46,129 #      - Source address: fe80::6cf6:d801:53e3:2838
2022-03-16 17:37:46,132 #      - Destination address: ff02::2
2022-03-16 17:37:46,139 # nib: Getting on-link node entry (addr = fe80::6cf6:d801:53e3:2838, iface = 6)
2022-03-16 17:37:46,141 #   No suitable entry found
ifconfig 6 add fd00:b:b::2/64
2022-03-16 17:37:54,394 # ifconfig 6 add fd00:b:b::2/64
2022-03-16 17:37:54,402 # nib: Allocating off-link-entry entry (next_hop = NULL, iface = 6, pfx = fd00:b:b::2/64)
2022-03-16 17:37:54,404 #   using 0x20000f08
2022-03-16 17:37:54,409 # nib: Allocating on-link node entry (addr = NULL, iface = 6)
2022-03-16 17:37:54,410 #   using 0
2022-03-16 17:37:54,414 # success: added fd00:b:b::2/64 to interface 6
> 2022-03-16 17:37:54,943 # nib: Handle timer event (ctx = 0x20001388, type = 0x4fc3, now = 34569ms)
2022-03-16 17:37:54,947 # nib: lookup ctx = 0x20001388, type = 4fc3
ifconfig
2022-03-16 17:37:57,249 # ifconfig
2022-03-16 17:37:57,255 # Iface  6  HWaddr: 69:7C  Channel: 26  NID: 0x23  PHY: O-QPSK 
2022-03-16 17:37:57,259 #           Long HWaddr: A6:D7:37:DB:AB:10:E9:7C 
2022-03-16 17:37:57,261 #            State: IDLE 
2022-03-16 17:37:57,266 #           ACK_REQ  L2-PDU:102  MTU:1280  HL:64  RTR  
2022-03-16 17:37:57,268 #           6LO  IPHC  
2022-03-16 17:37:57,271 #           Source address length: 8
2022-03-16 17:37:57,274 #           Link type: wireless
2022-03-16 17:37:57,280 #           inet6 addr: fe80::a4d7:37db:ab10:e97c  scope: link  VAL
2022-03-16 17:37:57,284 #           inet6 addr: fd00:b:b::2  scope: global  VAL
2022-03-16 17:37:57,287 #           inet6 group: ff02::2
2022-03-16 17:37:57,290 #           inet6 group: ff02::1
2022-03-16 17:37:57,294 #           inet6 group: ff02::1:ff10:e97c
2022-03-16 17:37:57,296 #           inet6 group: ff02::1a
2022-03-16 17:37:57,300 #           inet6 group: ff02::1:ff00:2
2022-03-16 17:37:57,301 #           
2022-03-16 17:37:57,304 #           Statistics for Layer 2
2022-03-16 17:37:57,307 #             RX packets 5  bytes 201
2022-03-16 17:37:57,311 #             TX packets 7 (Multicast: 7)  bytes 0
2022-03-16 17:37:57,314 #             TX succeeded 6 errors 0
2022-03-16 17:37:57,317 #           Statistics for IPv6
2022-03-16 17:37:57,320 #             RX packets 5  bytes 306
2022-03-16 17:37:57,324 #             TX packets 6 (Multicast: 6)  bytes 370
2022-03-16 17:37:57,328 #             TX succeeded 6 errors 0
2022-03-16 17:37:57,328 # 
> 2022-03-16 17:38:00,132 # nib: Handle packet (icmpv6->type = 133)
2022-03-16 17:38:00,135 # nib: Received valid router solicitation:
2022-03-16 17:38:00,140 #      - Source address: fe80::6cf6:d801:53e3:2838
2022-03-16 17:38:00,143 #      - Destination address: ff02::2
2022-03-16 17:38:00,150 # nib: Getting on-link node entry (addr = fe80::6cf6:d801:53e3:2838, iface = 6)
2022-03-16 17:38:00,152 #   No suitable entry found
ping fd00:b:b::1
2022-03-16 17:38:08,786 # ping fd00:b:b::1
2022-03-16 17:38:08,791 # nib: get next hop link-layer address of fd00:b:b::1%6
2022-03-16 17:38:08,796 # nib: Getting on-link node entry (addr = fd00:b:b::1, iface = 6)
2022-03-16 17:38:08,799 #   No suitable entry found
2022-03-16 17:38:08,803 # nib: fd00:b:b::1 is off-link, resolve route
2022-03-16 17:38:08,807 # nib: get route fd00:b:b::1 for packet 0x20001a34
2022-03-16 17:38:08,811 # nib: get match for destination fd00:b:b::1 from NIB
2022-03-16 17:38:08,816 # nib: fd00:b:b::/64 => (nil)%6 matches with 127 bits
2022-03-16 17:38:08,818 # nib: best match (127 bits)
2022-03-16 17:38:08,826 # nib: no route to fd00:b:b::1 found or is prefix list entry, search neighbor cache
2022-03-16 17:38:08,830 # nib: prefix list entry => taking dst as next hop
2022-03-16 17:38:08,835 # nib: Getting on-link node entry (addr = fd00:b:b::1, iface = 6)
2022-03-16 17:38:08,838 #   No suitable entry found
2022-03-16 17:38:08,842 # nib: resolve address fd00:b:b::1 by probing neighbors
2022-03-16 17:38:08,848 # nib: Allocating on-link node entry (addr = fd00:b:b::1, iface = 6)
2022-03-16 17:38:08,851 #   0x20001130 is an exact match
2022-03-16 17:38:08,856 # nib: Adding to neighbor cache (addr = fd00:b:b::1, iface = 6)
2022-03-16 17:38:08,862 # nib: queueing (addr = fd00:b:b::1, iface = 6) for potential removal
2022-03-16 17:38:08,867 # nib: Probing nib: lookup ctx = 0x20001130, type = 4fc1
2022-03-16 17:38:08,873 # multicast to fd00:b:b::1's solicited nodes (retrans. timer = 1000ms)
2022-03-16 17:38:08,994 # nib: Handle packet (icmpv6->type = 135)
2022-03-16 17:38:08,998 # nib: Received valid neighbor solicitation:                                !!!!! Other node wants to know L2 address !!!!!
2022-03-16 17:38:09,001 #      - Target address: fd00:b:b::2
2022-03-16 17:38:09,004 #      - Source address: fd00:b:b::1
2022-03-16 17:38:09,008 #      - Destination address: ff02::1:ff00:2
2022-03-16 17:38:09,011 # nib: Storing SL2AO for later handling                                     !!!!! This SLLAO is never being handled --> NCE is not created !!!!!
2022-03-16 17:38:09,016 # nib: get next hop link-layer address of fd00:b:b::1%6
2022-03-16 17:38:09,021 # nib: Getting on-link node entry (addr = fd00:b:b::1, iface = 6)
2022-03-16 17:38:09,023 #   Found 0x20001130
2022-03-16 17:38:09,028 # nib: fd00:b:b::1 is in NC, start address resolution
2022-03-16 17:38:09,033 # nib: Getting on-link node entry (addr = fd00:b:b::1, iface = 6)
2022-03-16 17:38:09,035 #   Found 0x20001130
2022-03-16 17:38:09,040 # nib: resolve address fd00:b:b::1 by probing neighbors
2022-03-16 17:38:09,044 # nib: Probing nib: lookup ctx = 0x20001130, type = 4fc1
2022-03-16 17:38:09,054 # multicast to fd00:b:b::1's solicited nodes (skipping since there is already a multicast NS within 1000ms)
2022-03-16 17:38:09,056 # nib: host unreachable
2022-03-16 17:38:09,791 # nib: get next hop link-layer address of fd00:b:b::1%6
2022-03-16 17:38:09,797 # nib: Getting on-link node entry (addr = fd00:b:b::1, iface = 6)
2022-03-16 17:38:09,798 #   Found 0x20001130
2022-03-16 17:38:09,803 # nib: fd00:b:b::1 is in NC, start address resolution
2022-03-16 17:38:09,808 # nib: Getting on-link node entry (addr = fd00:b:b::1, iface = 6)
2022-03-16 17:38:09,810 #   Found 0x20001130
2022-03-16 17:38:09,815 # nib: resolve address fd00:b:b::1 by probing neighbors
2022-03-16 17:38:09,820 # nib: Probing nib: lookup ctx = 0x20001130, type = 4fc1
2022-03-16 17:38:09,829 # multicast to fd00:b:b::1's solicited nodes (skipping since there is already a multicast NS within 1000ms)
2022-03-16 17:38:09,831 # nib: host unreachable
2022-03-16 17:38:09,880 # nib: Handle timer event (ctx = 0x20001130, type = 0x4fc1, now = 49506ms)
2022-03-16 17:38:09,883 # nib: Retransmit neighbor solicitation
2022-03-16 17:38:09,888 # nib: Probing nib: lookup ctx = 0x20001130, type = 4fc1
2022-03-16 17:38:09,894 # multicast to fd00:b:b::1's solicited nodes (retrans. timer = 1000ms)
2022-03-16 17:38:10,016 # nib: Handle packet (icmpv6->type = 135)
2022-03-16 17:38:10,020 # nib: Received valid neighbor solicitation:
2022-03-16 17:38:10,023 #      - Target address: fd00:b:b::2
2022-03-16 17:38:10,026 #      - Source address: fd00:b:b::1
2022-03-16 17:38:10,030 #      - Destination address: ff02::1:ff00:2
2022-03-16 17:38:10,033 # nib: Storing SL2AO for later handling
2022-03-16 17:38:10,038 # nib: get next hop link-layer address of fd00:b:b::1%6
2022-03-16 17:38:10,043 # nib: Getting on-link node entry (addr = fd00:b:b::1, iface = 6)
2022-03-16 17:38:10,045 #   Found 0x20001130
2022-03-16 17:38:10,050 # nib: fd00:b:b::1 is in NC, start address resolution
2022-03-16 17:38:10,055 # nib: Getting on-link node entry (addr = fd00:b:b::1, iface = 6)
2022-03-16 17:38:10,057 #   Found 0x20001130
2022-03-16 17:38:10,062 # nib: resolve address fd00:b:b::1 by probing neighbors
2022-03-16 17:38:10,066 # nib: Probing nib: lookup ctx = 0x20001130, type = 4fc1
2022-03-16 17:38:10,076 # multicast to fd00:b:b::1's solicited nodes (skipping since there is already a multicast NS within 1000ms)
2022-03-16 17:38:10,078 # nib: host unreachable
2022-03-16 17:38:10,791 # nib: get next hop link-layer address of fd00:b:b::1%6
2022-03-16 17:38:10,797 # nib: Getting on-link node entry (addr = fd00:b:b::1, iface = 6)
2022-03-16 17:38:10,798 #   Found 0x20001130
2022-03-16 17:38:10,803 # nib: fd00:b:b::1 is in NC, start address resolution
2022-03-16 17:38:10,808 # nib: Getting on-link node entry (addr = fd00:b:b::1, iface = 6)
2022-03-16 17:38:10,810 #   Found 0x20001130
2022-03-16 17:38:10,815 # nib: resolve address fd00:b:b::1 by probing neighbors
2022-03-16 17:38:10,820 # nib: Probing nib: lookup ctx = 0x20001130, type = 4fc1
2022-03-16 17:38:10,829 # multicast to fd00:b:b::1's solicited nodes (skipping since there is already a multicast NS within 1000ms)
2022-03-16 17:38:10,831 # nib: host unreachable
2022-03-16 17:38:10,901 # nib: Handle timer event (ctx = 0x20001130, type = 0x4fc1, now = 50526ms)
2022-03-16 17:38:10,904 # nib: Retransmit neighbor solicitation
2022-03-16 17:38:10,909 # nib: Probing nib: lookup ctx = 0x20001130, type = 4fc1
2022-03-16 17:38:10,915 # multicast to fd00:b:b::1's solicited nodes (retrans. timer = 1000ms)
2022-03-16 17:38:11,036 # nib: Handle packet (icmpv6->type = 135)
2022-03-16 17:38:11,040 # nib: Received valid neighbor solicitation:
2022-03-16 17:38:11,043 #      - Target address: fd00:b:b::2
2022-03-16 17:38:11,046 #      - Source address: fd00:b:b::1
2022-03-16 17:38:11,050 #      - Destination address: ff02::1:ff00:2
2022-03-16 17:38:11,053 # nib: Storing SL2AO for later handling
2022-03-16 17:38:11,058 # nib: get next hop link-layer address of fd00:b:b::1%6
2022-03-16 17:38:11,064 # nib: Getting on-link node entry (addr = fd00:b:b::1, iface = 6)
2022-03-16 17:38:11,065 #   Found 0x20001130
2022-03-16 17:38:11,070 # nib: fd00:b:b::1 is in NC, start address resolution
2022-03-16 17:38:11,076 # nib: Getting on-link node entry (addr = fd00:b:b::1, iface = 6)
2022-03-16 17:38:11,077 #   Found 0x20001130
2022-03-16 17:38:11,082 # nib: resolve address fd00:b:b::1 by probing neighbors
2022-03-16 17:38:11,087 # nib: Probing nib: lookup ctx = 0x20001130, type = 4fc1
2022-03-16 17:38:11,096 # multicast to fd00:b:b::1's solicited nodes (skipping since there is already a multicast NS within 1000ms)
2022-03-16 17:38:11,098 # nib: host unreachable
2022-03-16 17:38:11,786 # 
2022-03-16 17:38:11,789 # --- fd00:b:b::1 PING statistics ---
2022-03-16 17:38:11,795 # 3 packets transmitted, 0 packets received, 100% packet loss
> 2022-03-16 17:38:11,921 # nib: Handle timer event (ctx = 0x20001130, type = 0x4fc1, now = 51547ms)
2022-03-16 17:38:11,925 # nib: Retransmit neighbor solicitation
2022-03-16 17:38:11,930 # nib: remove from neighbor cache (addr = fd00:b:b::1, iface = 6)
2022-03-16 17:38:12,954 # nib: Handle timer event (ctx = 0x20001388, type = 0x4fc3, now = 52580ms)
2022-03-16 17:38:12,957 # nib: lookup ctx = 0x20001388, type = 4fc3
2022-03-16 17:38:18,142 # nib: Handle packet (icmpv6->type = 133)
2022-03-16 17:38:18,145 # nib: Received valid router solicitation:
2022-03-16 17:38:18,150 #      - Source address: fe80::6cf6:d801:53e3:2838
2022-03-16 17:38:18,153 #      - Destination address: ff02::2
2022-03-16 17:38:18,159 # nib: Getting on-link node entry (addr = fe80::6cf6:d801:53e3:2838, iface = 6)
2022-03-16 17:38:18,162 #   No suitable entry found

Issues/PRs references

@benpicco benpicco added Type: bug The issue reports a bug / The PR fixes a bug (including spelling errors) Area: network Area: Networking labels Mar 21, 2022
@benpicco benpicco added the CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR label Apr 3, 2022
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benpicco previously approved these changes Apr 3, 2022
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@benpicco benpicco removed the CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR label Apr 4, 2022
@fabian18 fabian18 force-pushed the bugfix_nib_sllao_in_NS_6LR branch from 4113209 to 475e081 Compare April 4, 2022 15:46
@github-actions github-actions bot added the Area: sys Area: System label Apr 4, 2022
@benpicco benpicco dismissed their stale review April 4, 2022 16:11

code changed

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Makes sense, feel free to squash.

@fabian18 fabian18 force-pushed the bugfix_nib_sllao_in_NS_6LR branch from 475e081 to 560e43a Compare April 17, 2022 22:21
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How about this to be sure not to call _send_delayed_nbr_adv() with reply_aro = NULL

@benpicco benpicco added the CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR label Apr 18, 2022
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Turns out it's perfectly fine to call _send_delayed_nbr_adv() with reply_aro = NULL so this is all good.

@fabian18 fabian18 merged commit 5643b52 into RIOT-OS:master Apr 18, 2022
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Thank You for reviewing.

@chrysn chrysn added this to the Release 2022.07 milestone Aug 25, 2022
@fabian18 fabian18 deleted the bugfix_nib_sllao_in_NS_6LR branch January 11, 2025 15:32
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