wenquan2015 opened a new pull request, #17716:
URL: https://github.com/apache/nuttx/pull/17716
## Summary
If the length of received ip packet is shorter than length in ip header,
drop it.
## Impact
ipv6
## Testing
```
#!/usr/bin/env python3
from scapy.all import *
import time
import sys
def send_custom_icmpv6_echo(dst_ip, iface=None):
"""
发送自定义的ICMPv6 Echo Request报文
"""
if not iface:
iface = conf.iface
packet = Ether() / \
IPv6(
src="fe80::501c:16ff:fe3d:b4c8",
dst=dst_ip,
plen=100,
hlim=64 # Hop Limit
) / \
ICMPv6EchoRequest(
id=0x1234,
seq=0x1,
data=b"Custom ICMPv6 Echo Request" + b"\x00" * 20
)
try:
sendp(packet, iface=iface, verbose=True)
except PermissionError:
sys.exit(1)
if __name__ == "__main__":
send_custom_icmpv6_echo("fe80::40e1:c4ff:fe3f:48dd", "nuttx0")
```
test result:
```
mi@mi-ThinkCentre-M760t:~$ sudo tcpdump -i nuttx0 -nn
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on nuttx0, link-type EN10MB (Ethernet), snapshot length 262144
bytes
19:22:40.112912 IP6 fe80::501c:16ff:fe3d:b4c8 > fe80::40e1:c4ff:fe3f:48dd:
ICMP6, echo request, id 4660, seq 1, length 54
19:22:40.120683 IP6 fe80::40e1:c4ff:fe3f:48dd > ff02::1:ff3d:b4c8: ICMP6,
neighbor solicitation, who has fe80::501c:16ff:fe3d:b4c8, length 32
19:22:40.120750 IP6 fe80::501c:16ff:fe3d:b4c8 > fe80::40e1:c4ff:fe3f:48dd:
ICMP6, neighbor advertisement, tgt is fe80::501c:16ff:fe3d:b4c8, length 32
19:22:40.122106 IP6 fe80::40e1:c4ff:fe3f:48dd > fe80::501c:16ff:fe3d:b4c8:
ICMP6, echo reply, id 4660, seq 1, length 54
19:22:45.123449 IP6 fe80::501c:16ff:fe3d:b4c8 > fe80::40e1:c4ff:fe3f:48dd:
ICMP6, neighbor solicitation, who has fe80::40e1:c4ff:fe3f:48dd, length 32
19:22:45.132076 IP6 fe80::40e1:c4ff:fe3f:48dd > fe80::501c:16ff:fe3d:b4c8:
ICMP6, neighbor advertisement, tgt is fe80::40e1:c4ff:fe3f:48dd, length 32
19:23:48.462063 IP6 fe80::40e1:c4ff:fe3f:48dd > ff02::1: HBH (rtalert:
invalid len 0) [|hbhopt]
19:23:51.720750 IP6 fe80::40e1:c4ff:fe3f:48dd > ff02::1: HBH (rtalert:
invalid len 0) [|hbhopt]
19:23:53.689460 IP6 truncated-ip6 - 46 bytes
missing!fe80::501c:16ff:fe3d:b4c8 > fe80::40e1:c4ff:fe3f:48dd: ICMP6, echo
request, id 4660, seq 1, length 100
19:25:06.434749 IP6 truncated-ip6 - 46 bytes
missing!fe80::501c:16ff:fe3d:b4c8 > fe80::40e1:c4ff:fe3f:48dd: ICMP6, echo
request, id 4660, seq 1, length 100
19:25:53.471989 IP6 fe80::40e1:c4ff:fe3f:48dd > ff02::1: HBH (rtalert:
invalid len 0) [|hbhopt]
```
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
