user: 请将以下的汇编代码转换成C语言代码：

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    $0x4,%esi
  lea    D481(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D150(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D71(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D51(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D460(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D300(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D492(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D364(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D247(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D197(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D410(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D416(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D212(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D173(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D236(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D285(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D497(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D387(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D301(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D148(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D365(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D434(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D67(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D559(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D470(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D160(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D107(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D108(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D46(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D375(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D393(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D550(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D33(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D498(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D467(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D278(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D20(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D320(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D333(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D399(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D186(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D391(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D168(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D116(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D106(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D565(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D548(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D496(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D412(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D386(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D232(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D13(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D0(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D461(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D352(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D346(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x4,%esi
  lea    D278(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x1,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x1,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x1,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x1,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <assert@plt>
  mov    $0x0,%eax
  pop    %rbp
  ret
```

tool_calls: name: extract_symbolic_data
arguments: tag: D481
type_infered: string
name: extract_symbolic_data
arguments: tag: D150
type_infered: string
name: extract_symbolic_data
arguments: tag: D71
type_infered: string
name: extract_symbolic_data
arguments: tag: D51
type_infered: string
name: extract_symbolic_data
arguments: tag: D460
type_infered: string
name: extract_symbolic_data
arguments: tag: D300
type_infered: string
name: extract_symbolic_data
arguments: tag: D492
type_infered: string
name: extract_symbolic_data
arguments: tag: D364
type_infered: string
name: extract_symbolic_data
arguments: tag: D247
type_infered: string
name: extract_symbolic_data
arguments: tag: D197
type_infered: string
name: extract_symbolic_data
arguments: tag: D410
type_infered: string
name: extract_symbolic_data
arguments: tag: D416
type_infered: string
name: extract_symbolic_data
arguments: tag: D212
type_infered: string
name: extract_symbolic_data
arguments: tag: D173
type_infered: string
name: extract_symbolic_data
arguments: tag: D236
type_infered: string
name: extract_symbolic_data
arguments: tag: D285
type_infered: string
name: extract_symbolic_data
arguments: tag: D497
type_infered: string
name: extract_symbolic_data
arguments: tag: D387
type_infered: string
name: extract_symbolic_data
arguments: tag: D301
type_infered: string
name: extract_symbolic_data
arguments: tag: D148
type_infered: string
name: extract_symbolic_data
arguments: tag: D365
type_infered: string
name: extract_symbolic_data
arguments: tag: D434
type_infered: string
name: extract_symbolic_data
arguments: tag: D67
type_infered: string
name: extract_symbolic_data
arguments: tag: D559
type_infered: string
name: extract_symbolic_data
arguments: tag: D470
type_infered: string
name: extract_symbolic_data
arguments: tag: D160
type_infered: string
name: extract_symbolic_data
arguments: tag: D107
type_infered: string
name: extract_symbolic_data
arguments: tag: D108
type_infered: string
name: extract_symbolic_data
arguments: tag: D46
type_infered: string
name: extract_symbolic_data
arguments: tag: D375
type_infered: string
name: extract_symbolic_data
arguments: tag: D393
type_infered: string
name: extract_symbolic_data
arguments: tag: D550
type_infered: string
name: extract_symbolic_data
arguments: tag: D33
type_infered: string
name: extract_symbolic_data
arguments: tag: D498
type_infered: string
name: extract_symbolic_data
arguments: tag: D467
type_infered: string
name: extract_symbolic_data
arguments: tag: D278
type_infered: string
name: extract_symbolic_data
arguments: tag: D20
type_infered: string
name: extract_symbolic_data
arguments: tag: D320
type_infered: string
name: extract_symbolic_data
arguments: tag: D333
type_infered: string
name: extract_symbolic_data
arguments: tag: D399
type_infered: string
name: extract_symbolic_data
arguments: tag: D186
type_infered: string
name: extract_symbolic_data
arguments: tag: D391
type_infered: string
name: extract_symbolic_data
arguments: tag: D168
type_infered: string
name: extract_symbolic_data
arguments: tag: D116
type_infered: string
name: extract_symbolic_data
arguments: tag: D106
type_infered: string
name: extract_symbolic_data
arguments: tag: D565
type_infered: string
name: extract_symbolic_data
arguments: tag: D548
type_infered: string
name: extract_symbolic_data
arguments: tag: D496
type_infered: string
name: extract_symbolic_data
arguments: tag: D412
type_infered: string
name: extract_symbolic_data
arguments: tag: D386
type_infered: string
name: extract_symbolic_data
arguments: tag: D232
type_infered: string
name: extract_symbolic_data
arguments: tag: D13
type_infered: string
name: extract_symbolic_data
arguments: tag: D0
type_infered: string
name: extract_symbolic_data
arguments: tag: D461
type_infered: string
name: extract_symbolic_data
arguments: tag: D352
type_infered: string
name: extract_symbolic_data
arguments: tag: D346
type_infered: string

tool: D481: ether_addr: %zu


tool: D150: ether_header: %zu


tool: D71: arphdr: %zu


tool: D51: arpreq: %zu


tool: D460: arpreq_old: %zu


tool: D300: icmp6_filter: %zu


tool: D492: icmp6_hdr: %zu


tool: D364: nd_router_solicit: %zu


tool: D247: nd_router_advert: %zu


tool: D197: nd_neighbor_advert: %zu


tool: D410: nd_redirect: %zu


tool: D416: nd_opt_hdr: %zu


tool: D212: nd_opt_prefix_info: %zu


tool: D173: nd_opt_rd_hdr: %zu


tool: D236: nd_opt_mtu: %zu


tool: D285: mld_hdr: %zu


tool: D497: rr_pco_match: %zu


tool: D387: rr_pco_use: %zu


tool: D301: rr_result: %zu


tool: D148: nd_opt_adv_interval: %zu


tool: D365: nd_opt_home_agent_info: %zu


tool: D434: ethhdr: %zu


tool: D67: ether_arp: %zu


tool: D559: igmp: %zu


tool: D470: in_addr: %zu


tool: D160: sockaddr_in: %zu


tool: D107: in6_addr: %zu


tool: D108: sockaddr_in6: %zu


tool: D46: ipv6_mreq: %zu


tool: D375: ip_opts: %zu


tool: D393: ip_mreq: %zu


tool: D550: ip_mreqn: %zu


tool: D33: ip_mreq_source: %zu


tool: D498: ip_msfilter: %zu


tool: D467: in_pktinfo: %zu


tool: D278: icmphdr: %zu


tool: D20: icmp_ra_addr: %zu


tool: D320: icmp: %zu


tool: D333: timestamp: %zu


tool: D399: iphdr: %zu


tool: D186: ip: %zu


tool: D391: ip_timestamp: %zu


tool: D168: ip6_hdr: %zu


tool: D116: ip6_ext: %zu


tool: D106: ip6_hbh: %zu


tool: D565: ip6_dest: %zu


tool: D548: ip6_rthdr: %zu


tool: D496: ip6_rthdr0: %zu


tool: D412: ip6_frag: %zu


tool: D386: ip6_opt: %zu


tool: D232: ip6_opt_jumbo: %zu


tool: D13: ip6_opt_nsap: %zu


tool: D0: ip6_opt_tunnel: %zu


tool: D461: ip6_opt_router: %zu


tool: D352: tcphdr: %zu


tool: D346: udphdr: %zu


assistant: ```c
int main() {
  printf("ether_addr: %zu\n", sizeof(struct ether_addr));
  printf("ether_header: %zu\n", sizeof(struct ether_header));
  printf("arphdr: %zu\n", sizeof(struct arphdr));
  printf("arpreq: %zu\n", sizeof(struct arpreq));
  printf("arpreq_old: %zu\n", sizeof(struct arpreq_old));
  printf("icmp6_filter: %zu\n", sizeof(struct icmp6_filter));
  printf("icmp6_hdr: %zu\n", sizeof(struct icmp6_hdr));
  printf("nd_router_solicit: %zu\n", sizeof(struct nd_router_solicit));
  printf("nd_router_advert: %zu\n", sizeof(struct nd_router_advert));
  printf("nd_neighbor_advert: %zu\n", sizeof(struct nd_neighbor_advert));
  printf("nd_redirect: %zu\n", sizeof(struct nd_redirect));
  printf("nd_opt_hdr: %zu\n", sizeof(struct nd_opt_hdr));
  printf("nd_opt_prefix_info: %zu\n", sizeof(struct nd_opt_prefix_info));
  printf("nd_opt_rd_hdr: %zu\n", sizeof(struct nd_opt_rd_hdr));
  printf("nd_opt_mtu: %zu\n", sizeof(struct nd_opt_mtu));
  printf("mld_hdr: %zu\n", sizeof(struct mld_hdr));
  printf("rr_pco_match: %zu\n", sizeof(struct rr_pco_match));
  printf("rr_pco_use: %zu\n", sizeof(struct rr_pco_use));
  printf("rr_result: %zu\n", sizeof(struct rr_result));
  printf("nd_opt_adv_interval: %zu\n", sizeof(struct nd_opt_adv_interval));
  printf("nd_opt_home_agent_info: %zu\n", sizeof(struct nd_opt_home_agent_info));
  printf("ethhdr: %zu\n", sizeof(struct ethhdr));
  printf("ether_arp: %zu\n", sizeof(struct ether_arp));
  printf("igmp: %zu\n", sizeof(struct igmp));
  printf("in_addr: %zu\n", sizeof(struct in_addr));
  printf("sockaddr_in: %zu\n", sizeof(struct sockaddr_in));
  printf("in6_addr: %zu\n", sizeof(struct in6_addr));
  printf("sockaddr_in6: %zu\n", sizeof(struct sockaddr_in6));
  printf("ipv6_mreq: %zu\n", sizeof(struct ipv6_mreq));
  printf("ip_opts: %zu\n", sizeof(struct ip_opts));
  printf("ip_mreq: %zu\n", sizeof(struct ip_mreq));
  printf("ip_mreqn: %zu\n", sizeof(struct ip_mreqn));
  printf("ip_mreq_source: %zu\n", sizeof(struct ip_mreq_source));
  printf("ip_msfilter: %zu\n", sizeof(struct ip_msfilter));
  printf("in_pktinfo: %zu\n", sizeof(struct in_pktinfo));
  printf("icmphdr: %zu\n", sizeof(struct icmphdr));
  printf("icmp_ra_addr: %zu\n", sizeof(struct icmp_ra_addr));
  printf("icmp: %zu\n", sizeof(struct icmp));
  printf("timestamp: %zu\n", sizeof(struct timestamp));
  printf("iphdr: %zu\n", sizeof(struct iphdr));
  printf("ip: %zu\n", sizeof(struct ip));
  printf("ip_timestamp: %zu\n", sizeof(struct ip_timestamp));
  printf("ip6_hdr: %zu\n", sizeof(struct ip6_hdr));
  printf("ip6_ext: %zu\n", sizeof(struct ip6_ext));
  printf("ip6_hbh: %zu\n", sizeof(struct ip6_hbh));
  printf("ip6_dest: %zu\n", sizeof(struct ip6_dest));
  printf("ip6_rthdr: %zu\n", sizeof(struct ip6_rthdr));
  printf("ip6_rthdr0: %zu\n", sizeof(struct ip6_rthdr0));
  printf("ip6_frag: %zu\n", sizeof(struct ip6_frag));
  printf("ip6_opt: %zu\n", sizeof(struct ip6_opt));
  printf("ip6_opt_jumbo: %zu\n", sizeof(struct ip6_opt_jumbo));
  printf("ip6_opt_nsap: %zu\n", sizeof(struct ip6_opt_nsap));
  printf("ip6_opt_tunnel: %zu\n", sizeof(struct ip6_opt_tunnel));
  printf("ip6_opt_router: %zu\n", sizeof(struct ip6_opt_router));
  printf("tcphdr: %zu\n", sizeof(struct tcphdr));
  printf("udphdr: %zu\n", sizeof(struct udphdr));
  printf("icmphdr: %zu\n", sizeof(struct icmphdr));
  assert(sizeof(struct ether_addr) == 6);
  assert(sizeof(struct ether_header) == 14);
  assert(sizeof(struct arphdr) == 8);
  assert(sizeof(struct arpreq) == 68);
  assert(sizeof(struct arpreq_old) == 52);
  assert(sizeof(struct icmp6_filter) == 32);
  assert(sizeof(struct icmp6_hdr) == 8);
  assert(sizeof(struct nd_router_solicit) == 8);
  assert(sizeof(struct nd_router_advert) == 16);
  assert(sizeof(struct nd_neighbor_advert) == 24);
  assert(sizeof(struct nd_redirect) == 40);
  assert(sizeof(struct nd_opt_hdr) == 2);
  assert(sizeof(struct nd_opt_prefix_info) == 32);
  assert(sizeof(struct nd_opt_rd_hdr) == 8);
  assert(sizeof(struct nd_opt_mtu) == 8);
  assert(sizeof(struct mld_hdr) == 24);
  assert(sizeof(struct rr_pco_match) == 24);
  assert(sizeof(struct rr_pco_use) == 32);
  assert(sizeof(struct rr_result) == 24);
  assert(sizeof(struct nd_opt_adv_interval) == 8);
  assert(sizeof(struct nd_opt_home_agent_info) == 8);
  assert(sizeof(struct ethhdr) == 14);
  assert(sizeof(struct ether_arp) == 28);
  assert(sizeof(struct igmp) == 8);
  assert(sizeof(struct in_addr) == 4);
  assert(sizeof(struct sockaddr_in) == 16);
  assert(sizeof(struct in6_addr) == 16);
  assert(sizeof(struct sockaddr_in6) == 28);
  assert(sizeof(struct ipv6_mreq) == 20);
  assert(sizeof(struct ip_opts) == 44);
  assert(sizeof(struct ip_mreq) == 8);
  assert(sizeof(struct ip_mreqn) == 12);
  assert(sizeof(struct ip_mreq_source) == 12);
  assert(sizeof(struct ip_msfilter) == 20);
  assert(sizeof(struct in_pktinfo) == 12);
  assert(sizeof(struct icmphdr) == 8);
  assert(sizeof(struct icmp_ra_addr) == 8);
  assert(sizeof(struct icmp) == 28);
  assert(sizeof(struct timestamp) == 40);
  assert(sizeof(struct iphdr) == 20);
  assert(sizeof(struct ip) == 20);
  assert(sizeof(struct ip_timestamp) == 40);
  assert(sizeof(struct ip6_hdr) == 40);
  assert(sizeof(struct ip6_ext) == 2);
  assert(sizeof(struct ip6_hbh) == 2);
  assert(sizeof(struct ip6_dest) == 2);
  assert(sizeof(struct ip6_rthdr) == 4);
  assert(sizeof(struct ip6_rthdr0) == 8);
  assert(sizeof(struct ip6_frag) == 8);
  assert(sizeof(struct ip6_opt) == 2);
  assert(sizeof(struct ip6_opt_jumbo) == 6);
  assert(sizeof(struct ip6_opt_nsap) == 4);
  assert(sizeof(struct ip6_opt_tunnel) == 3);
  assert(sizeof(struct ip6_opt_router) == 4);
  assert(sizeof(struct tcphdr) == 20);
  assert(sizeof(struct udphdr) == 8);
  assert(sizeof(struct icmphdr) == 8);
}
```