neighbour

https://man7.org/linux/man-pages/man8/ip-neighbour.8.html

  The ip neigh command manipulates neighbour objects that establish
  bindings between protocol addresses and link layer addresses for
  hosts sharing the same link.  Neighbour entries are organized
  into tables. The IPv4 neighbour table is also known by another
  name - the ARP table.

neighbour.c 是 arp.c 的基础。

但是 neighbour 也是 appletalk 的基础: https://developer.apple.com/library/archive/documentation/mac/pdf/Networking/Introduction_to_AppleTalk.pdf 的入口之一。

虚拟机中

10.0.2.3 dev ens4 lladdr 52:55:0a:00:02:03 STALE
10.0.0.109 dev ens5 INCOMPLETE
10.0.2.2 dev ens4 lladdr 52:55:0a:00:02:02 DELAY
fe80::2 dev ens4 lladdr 52:56:00:00:00:02 router STALE

13900k

🤒  ip neigh
10.0.0.4 dev br-in lladdr 74:5d:22:40:f8:94 STALE
10.0.105.188 dev br-in FAILED
192.168.8.1 dev wlo1 lladdr 94:04:9c:d1:26:3a REACHABLE
10.0.73.0 dev br-in lladdr 52:54:00:00:02:49 STALE
10.0.0.16 dev br-in FAILED
10.0.0.1 dev br-in lladdr c8:a3:62:37:f4:7a REACHABLE
10.0.0.107 dev br-in lladdr 52:54:00:00:03:32 STALE
10.0.50.0 dev br-in FAILED
10.0.5.0 dev br-in lladdr 52:54:00:00:02:05 STALE
10.0.0.108 dev br-in lladdr 52:54:00:00:02:32 STALE
10.0.55.0 dev br-in lladdr 52:54:00:00:02:37 STALE

mac 中，难道只是因为没有设置密码，就多了这么多的 neighbour ?

🧀  ip neigh
192.168.11.3 dev wlp1s0f0 lladdr 70:a8:d3:66:73:bc STALE
192.168.11.192 dev wlp1s0f0 lladdr 08:6a:c5:1a:72:96 STALE
10.0.2.15 dev br-in lladdr 52:54:00:00:02:33 STALE
10.0.60.0 dev br-in lladdr 52:54:00:00:02:3c STALE
192.168.10.125 dev wlp1s0f0 lladdr 32:b7:11:ba:c1:bf STALE
192.168.10.43 dev wlp1s0f0 FAILED
10.0.0.2 dev br-in lladdr 00:e0:4c:68:0c:0c REACHABLE
192.168.10.122 dev wlp1s0f0 FAILED
10.0.73.0 dev br-in lladdr 52:54:00:00:02:49 STALE
192.168.10.89 dev wlp1s0f0 FAILED
192.168.9.125 dev wlp1s0f0 lladdr f8:af:05:08:2f:b8 STALE
192.168.11.243 dev wlp1s0f0 lladdr ac:82:47:d7:10:90 STALE
10.0.0.108 dev br-in lladdr 52:54:00:00:02:32 STALE
192.168.10.216 dev wlp1s0f0 FAILED
192.168.8.1 dev wlp1s0f0 lladdr 94:04:9c:d1:26:3a DELAY
10.0.51.0 dev br-in lladdr 52:54:00:00:02:33 STALE
192.168.10.191 dev wlp1s0f0 lladdr 82:a1:9b:c4:a8:db STALE
fe80::2d73:47a8:338a:d1d8 dev br-in lladdr 52:54:00:00:02:49 STALE

原来 arp 是基于 neighbour 的

- sysvec_apic_timer_interrupt
  - instr_sysvec_apic_timer_interrupt
    - irq_exit_rcu
      - __irq_exit_rcu
        - invoke_softirq
          - __do_softirq
            - handle_softirqs
              - run_timer_softirq
                - run_timer_base
                  - __run_timer_base
                    - __run_timers
                      - expire_timers
                        - call_timer_fn
                          - neigh_timer_handler
                            - neigh_invalidate
                                - dst_link_failure
                                  - ipv4_link_failure
                                    - ipv4_send_dest_unreach
                                      - __icmp_send
                                        - ip_push_pending_frames
                                          - ip_send_skb
                                            - ip_local_out
                                              - dst_output
                                                - ip_output
                                                  - okfn=<optimized
                                                    - NF_HOOK_COND
                                                      - ip_finish_output
                                                        - cgroup_bpf_sock_enabled

所以什么是 rarp

net/core/neighbour.c

进一步的分析参考: https://github.com/liexusong/linux-source-code-analyze/blob/master/arp-neighbour.md

arp 协议

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