ipip学习记录-----ipip arp过程

ipv4的情况下:
ping 10.10.200.10 -c 8

ip_finish_output2()-->___neigh_create()-->arp_constructor()
static int arp_constructor(struct neighbour *neigh)
{
 ......
if (!dev->header_ops) {
neigh->nud_state = NUD_NOARP;
neigh->ops = &arp_direct_ops;
neigh->output = neigh_direct_output;
} 
......
}
static const struct neigh_ops arp_direct_ops = {
.family = AF_INET,
.output = neigh_direct_output,
.connected_output = neigh_direct_output,
};

int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb)
{
return dev_queue_xmit(skb);
}
EXPORT_SYMBOL(neigh_direct_output);

Jul  7 16:29:29 chro kernel: [  279.227770] CPU: 9 PID: 5317 Comm: ping Not tainted 5.4.1+ #104
Jul  7 16:29:29 chro kernel: [  279.227772] Hardware name: MACHENIKE F117-X/X15CN, BIOS 008.T14 01/26/2021
Jul  7 16:29:29 chro kernel: [  279.227773] Call Trace:
Jul  7 16:29:29 chro kernel: [  279.227778]  dump_stack+0x6d/0x95
Jul  7 16:29:29 chro kernel: [  279.227788]  ipip_tunnel_xmit+0x4d/0x170 [ipip]
Jul  7 16:29:29 chro kernel: [  279.227794]  dev_hard_start_xmit+0x96/0x200
Jul  7 16:29:29 chro kernel: [  279.227801]  __dev_queue_xmit+0x775/0xa10
Jul  7 16:29:29 chro kernel: [  279.227809]  ? _raw_write_unlock_bh+0x1a/0x20
Jul  7 16:29:29 chro kernel: [  279.227813]  ? vprintk_func+0x47/0xc0
Jul  7 16:29:29 chro kernel: [  279.227817]  dev_queue_xmit+0x10/0x20
Jul  7 16:29:29 chro kernel: [  279.227821]  ? dev_queue_xmit+0x10/0x20
Jul  7 16:29:29 chro kernel: [  279.227825]  neigh_direct_output+0x11/0x20
Jul  7 16:29:29 chro kernel: [  279.227828]  ip_finish_output2+0x1fe/0x900
Jul  7 16:29:29 chro kernel: [  279.227833]  __ip_finish_output+0xfa/0x1c0
Jul  7 16:29:29 chro kernel: [  279.227836]  ? __ip_finish_output+0xfa/0x1c0
Jul  7 16:29:29 chro kernel: [  279.227840]  ip_finish_output+0x2c/0xa0
Jul  7 16:29:29 chro kernel: [  279.227845]  ip_output+0x6d/0xe0
Jul  7 16:29:29 chro kernel: [  279.227849]  ? __ip_finish_output+0x1c0/0x1c0
Jul  7 16:29:29 chro kernel: [  279.227855]  ip_local_out+0x3b/0x50
Jul  7 16:29:29 chro kernel: [  279.227861]  ip_send_skb+0x19/0x40
Jul  7 16:29:29 chro kernel: [  279.227865]  ip_push_pending_frames+0x33/0x40
Jul  7 16:29:29 chro kernel: [  279.227872]  raw_sendmsg+0x9e5/0xcc0
Jul  7 16:29:29 chro kernel: [  279.227878]  ? pat_enabled+0x20/0x20
Jul  7 16:29:29 chro kernel: [  279.227887]  ? _cond_resched+0x19/0x40
Jul  7 16:29:29 chro kernel: [  279.227892]  ? aa_sk_perm+0x43/0x190
Jul  7 16:29:29 chro kernel: [  279.227899]  inet_sendmsg+0x64/0x70
Jul  7 16:29:29 chro kernel: [  279.227906]  ? inet_sendmsg+0x64/0x70
Jul  7 16:29:29 chro kernel: [  279.227912]  sock_sendmsg+0x5c/0x70
Jul  7 16:29:29 chro kernel: [  279.227918]  __sys_sendto+0x13f/0x180
Jul  7 16:29:29 chro kernel: [  279.227925]  ? handle_mm_fault+0xcb/0x210
Jul  7 16:29:29 chro kernel: [  279.227930]  ? __do_page_fault+0x2be/0x4d0
Jul  7 16:29:29 chro kernel: [  279.227938]  __x64_sys_sendto+0x28/0x30
Jul  7 16:29:29 chro kernel: [  279.227945]  do_syscall_64+0x57/0x190
Jul  7 16:29:29 chro kernel: [  279.227952]  entry_SYSCALL_64_after_hwframe+0x44/0xa9

ip_finish_output2()-->___neigh_create()-->arp_constructor()-->neigh_direct_output()-->dev_hard_start_xmit()-->ipip_tunnel_xmit()-->ip_tunnel_xmit()-->iptunnel_xmit()-->ip_local_out()-->ip_finish_output2()-->___neigh_create()-->arp_constructor()
ip_finish_output2()-->___neigh_create()-->arp_constructor()

static int arp_constructor(struct neighbour *neigh)
{
 ......
else {
if (dev->header_ops->cache)
neigh->ops = &arp_hh_ops;
else
neigh->ops = &arp_generic_ops;

if (neigh->nud_state & NUD_VALID)
neigh->output = neigh->ops->connected_output;
else
neigh->output = neigh->ops->output;
}
return 0;
}

static const struct neigh_ops arp_generic_ops = {
.family = AF_INET,
.solicit = arp_solicit,
.error_report = arp_error_report,
.output = neigh_resolve_output,
.connected_output = neigh_connected_output,
};

Jul  7 16:29:29 chro kernel: [  279.229426] Call Trace:
Jul  7 16:29:29 chro kernel: [  279.229432]  dump_stack+0x6d/0x95
Jul  7 16:29:29 chro kernel: [  279.229438]  arp_send_dst.part.20+0x39/0x90
Jul  7 16:29:29 chro kernel: [  279.229443]  arp_solicit+0x120/0x300
Jul  7 16:29:29 chro kernel: [  279.229450]  ? skb_clone+0x56/0xc0
Jul  7 16:29:29 chro kernel: [  279.229457]  ? __skb_clone+0x2e/0x130
Jul  7 16:29:29 chro kernel: [  279.229463]  neigh_probe+0x52/0x70
Jul  7 16:29:29 chro kernel: [  279.229469]  __neigh_event_send+0x1a2/0x350
Jul  7 16:29:29 chro kernel: [  279.229474]  neigh_resolve_output+0x128/0x1c0
Jul  7 16:29:29 chro kernel: [  279.229479]  ip_finish_output2+0x1fe/0x900
Jul  7 16:29:29 chro kernel: [  279.229497]  ? nf_ct_deliver_cached_events+0xa9/0x110 [nf_conntrack]
Jul  7 16:29:29 chro kernel: [  279.229505]  __ip_finish_output+0xfa/0x1c0
Jul  7 16:29:29 chro kernel: [  279.229508]  ? __ip_finish_output+0xfa/0x1c0
Jul  7 16:29:29 chro kernel: [  279.229513]  ip_finish_output+0x2c/0xa0
Jul  7 16:29:29 chro kernel: [  279.229517]  ip_output+0x6d/0xe0
Jul  7 16:29:29 chro kernel: [  279.229522]  ? __ip_finish_output+0x1c0/0x1c0
Jul  7 16:29:29 chro kernel: [  279.229526]  ip_local_out+0x3b/0x50
Jul  7 16:29:29 chro kernel: [  279.229532]  iptunnel_xmit+0x174/0x200
Jul  7 16:29:29 chro kernel: [  279.229541]  ip_tunnel_xmit+0x683/0x940 [ip_tunnel]
Jul  7 16:29:29 chro kernel: [  279.229552]  ipip_tunnel_xmit+0x166/0x170 [ipip]
Jul  7 16:29:29 chro kernel: [  279.229557]  dev_hard_start_xmit+0x96/0x200
Jul  7 16:29:29 chro kernel: [  279.229562]  __dev_queue_xmit+0x775/0xa10
Jul  7 16:29:29 chro kernel: [  279.229569]  ? _raw_write_unlock_bh+0x1a/0x20
Jul  7 16:29:29 chro kernel: [  279.229574]  ? vprintk_func+0x47/0xc0
Jul  7 16:29:29 chro kernel: [  279.229580]  dev_queue_xmit+0x10/0x20
Jul  7 16:29:29 chro kernel: [  279.229584]  ? dev_queue_xmit+0x10/0x20
Jul  7 16:29:29 chro kernel: [  279.229590]  neigh_direct_output+0x11/0x20
Jul  7 16:29:29 chro kernel: [  279.229594]  ip_finish_output2+0x1fe/0x900
Jul  7 16:29:29 chro kernel: [  279.229600]  __ip_finish_output+0xfa/0x1c0
Jul  7 16:29:29 chro kernel: [  279.229604]  ? __ip_finish_output+0xfa/0x1c0
Jul  7 16:29:29 chro kernel: [  279.229608]  ip_finish_output+0x2c/0xa0
Jul  7 16:29:29 chro kernel: [  279.229613]  ip_output+0x6d/0xe0
Jul  7 16:29:29 chro kernel: [  279.229617]  ? __ip_finish_output+0x1c0/0x1c0
Jul  7 16:29:29 chro kernel: [  279.229622]  ip_local_out+0x3b/0x50
Jul  7 16:29:29 chro kernel: [  279.229627]  ip_send_skb+0x19/0x40
Jul  7 16:29:29 chro kernel: [  279.229631]  ip_push_pending_frames+0x33/0x40
Jul  7 16:29:29 chro kernel: [  279.229637]  raw_sendmsg+0x9e5/0xcc0
Jul  7 16:29:29 chro kernel: [  279.229643]  ? pat_enabled+0x20/0x20
Jul  7 16:29:29 chro kernel: [  279.229652]  ? _cond_resched+0x19/0x40
Jul  7 16:29:29 chro kernel: [  279.229657]  ? aa_sk_perm+0x43/0x190
Jul  7 16:29:29 chro kernel: [  279.229663]  inet_sendmsg+0x64/0x70
Jul  7 16:29:29 chro kernel: [  279.229670]  ? inet_sendmsg+0x64/0x70
Jul  7 16:29:29 chro kernel: [  279.229678]  sock_sendmsg+0x5c/0x70
Jul  7 16:29:29 chro kernel: [  279.229684]  __sys_sendto+0x13f/0x180
Jul  7 16:29:29 chro kernel: [  279.229692]  ? handle_mm_fault+0xcb/0x210
Jul  7 16:29:29 chro kernel: [  279.229697]  ? __do_page_fault+0x2be/0x4d0
Jul  7 16:29:29 chro kernel: [  279.229705]  __x64_sys_sendto+0x28/0x30
Jul  7 16:29:29 chro kernel: [  279.229713]  do_syscall_64+0x57/0x190
Jul  7 16:29:29 chro kernel: [  279.229720]  entry_SYSCALL_64_after_hwframe+0x44/0xa9