ipip学习记录-----ipip_tunnel_rcv

ipip rcv:

static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
{
struct net *net = dev_net(skb->dev);
struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
struct metadata_dst *tun_dst = NULL;
struct ip_tunnel *tunnel;
const struct iphdr *iph;

printk("ipip_tunnel_rcv() 219! ip_hdr(skb)->daddr = %x ip_hdr(skb)->saddr = %x\n",ip_hdr(skb)->daddr, ip_hdr(skb)->saddr);
dump_stack();

iph = ip_hdr(skb);
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
iph->saddr, iph->daddr, 0);

if (tunnel) {
......
return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
}

int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
  const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
  bool log_ecn_error)
{
struct pcpu_sw_netstats *tstats;
const struct iphdr *iph = ip_hdr(skb);
int err;

printk("ip_tunnel_rcv() 368! ip_hdr(skb)->daddr = %x ip_hdr(skb)->saddr = %x\n",ip_hdr(skb)->daddr, ip_hdr(skb)->saddr);

......
skb_reset_network_header(skb);//ip地址重置
err = IP_ECN_decapsulate(iph, skb);

gro_cells_receive(&tunnel->gro_cells, skb);
return 0;
}

Jul  5 17:14:19 chro kernel: [   72.440828] ipip_tunnel_rcv() 219! ip_hdr(skb)->daddr = 2140a0a ip_hdr(skb)->saddr = 20a0a0a
Jul  5 17:14:19 chro kernel: [   72.440828] CPU: 7 PID: 4157 Comm: ping Not tainted 5.4.1+ #93
Jul  5 17:14:19 chro kernel: [   72.440829] Hardware name: MACHENIKE F117-X/X15CN, BIOS 008.T14 01/26/2021
Jul  5 17:14:19 chro kernel: [   72.440829] Call Trace:
Jul  5 17:14:19 chro kernel: [   72.440829] 
Jul  5 17:14:19 chro kernel: [   72.440830]  dump_stack+0x6d/0x95
Jul  5 17:14:19 chro kernel: [   72.440862]  ipip_tunnel_rcv+0x5d/0x260 [ipip]
Jul  5 17:14:19 chro kernel: [   72.440863]  ipip_rcv+0x13/0x15 [ipip]
Jul  5 17:14:19 chro kernel: [   72.440865]  tunnel4_rcv+0x3e/0x89 [tunnel4]
Jul  5 17:14:19 chro kernel: [   72.440867]  ip_protocol_deliver_rcu+0x187/0x1b0
Jul  5 17:14:19 chro kernel: [   72.440870]  ip_local_deliver_finish+0x48/0x50
Jul  5 17:14:19 chro kernel: [   72.440872]  ip_local_deliver+0x7e/0xe0
Jul  5 17:14:19 chro kernel: [   72.440873]  ip_rcv_finish+0x1b7/0x1c0
Jul  5 17:14:19 chro kernel: [   72.440875]  ip_rcv+0xdf/0x120
Jul  5 17:14:19 chro kernel: [   72.440877]  __netif_receive_skb_one_core+0x84/0xa0
Jul  5 17:14:19 chro kernel: [   72.440878]  __netif_receive_skb+0x18/0x60
Jul  5 17:14:19 chro kernel: [   72.440880]  process_backlog+0xa0/0x170
Jul  5 17:14:19 chro kernel: [   72.440882]  net_rx_action+0x140/0x3c0
Jul  5 17:14:19 chro kernel: [   72.440884]  __do_softirq+0xe4/0x2da
Jul  5 17:14:19 chro kernel: [   72.440885]  do_softirq_own_stack+0x2a/0x40
Jul  5 17:14:19 chro kernel: [   72.440886] 
Jul  5 17:14:19 chro kernel: [   72.440907]  do_softirq.part.20+0x46/0x50
Jul  5 17:14:19 chro kernel: [   72.440909]  __local_bh_enable_ip+0x50/0x60
Jul  5 17:14:19 chro kernel: [   72.440911]  ip_finish_output2+0x211/0x8a0
Jul  5 17:14:19 chro kernel: [   72.440912]  __ip_finish_output+0xfa/0x1c0
Jul  5 17:14:19 chro kernel: [   72.440914]  ? __ip_finish_output+0xfa/0x1c0
Jul  5 17:14:19 chro kernel: [   72.440915]  ip_finish_output+0x2c/0xa0
Jul  5 17:14:19 chro kernel: [   72.440916]  ip_output+0x6d/0xe0
Jul  5 17:14:19 chro kernel: [   72.440917]  ? __ip_finish_output+0x1c0/0x1c0
Jul  5 17:14:19 chro kernel: [   72.440919]  ip_local_out+0x3b/0x50
Jul  5 17:14:19 chro kernel: [   72.440920]  ip_send_skb+0x19/0x40
Jul  5 17:14:19 chro kernel: [   72.440921]  ip_push_pending_frames+0x33/0x40
Jul  5 17:14:19 chro kernel: [   72.440923]  raw_sendmsg+0x9e5/0xcc0
Jul  5 17:14:19 chro kernel: [   72.440926]  ? pat_enabled+0x20/0x20
Jul  5 17:14:19 chro kernel: [   72.440927]  ? down_read+0x12/0xa0
Jul  5 17:14:19 chro kernel: [   72.440929]  ? copy_termios+0x71/0x80
Jul  5 17:14:19 chro kernel: [   72.440930]  ? _copy_to_user+0x26/0x30
Jul  5 17:14:19 chro kernel: [   72.440931]  ? _cond_resched+0x19/0x40
Jul  5 17:14:19 chro kernel: [   72.440933]  ? aa_sk_perm+0x43/0x190
Jul  5 17:14:19 chro kernel: [   72.440934]  inet_sendmsg+0x64/0x70
Jul  5 17:14:19 chro kernel: [   72.440936]  ? inet_sendmsg+0x64/0x70
Jul  5 17:14:19 chro kernel: [   72.440937]  sock_sendmsg+0x5c/0x70
Jul  5 17:14:19 chro kernel: [   72.440939]  __sys_sendto+0x13f/0x180
Jul  5 17:14:19 chro kernel: [   72.440941]  ? handle_mm_fault+0xcb/0x210
Jul  5 17:14:19 chro kernel: [   72.440944]  ? ksys_ioctl+0x75/0x80
Jul  5 17:14:19 chro kernel: [   72.440945]  __x64_sys_sendto+0x28/0x30
Jul  5 17:14:19 chro kernel: [   72.440947]  do_syscall_64+0x57/0x190
Jul  5 17:14:19 chro kernel: [   72.440948]  entry_SYSCALL_64_after_hwframe+0x44/0xa9