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authorJulian Elischer <jrelis@google.com>2020-10-27 19:30:20 -0700
committergVisor bot <gvisor-bot@google.com>2020-10-27 19:32:09 -0700
commit035b1c8272b2a26f96bf4ad04330e04dba2f8ff6 (patch)
tree4b2ec147a1b18e82b53e0aa42e073b5d09d548f4 /pkg/tcpip/header/ipversion_test.go
parentbc91ae17f682d2a0a6062101707e2707f965a9b2 (diff)
Add support for Timestamp and RecordRoute IP options
IPv4 options extend the size of the IP header and have a basic known format. The framework can process that format without needing to know about every possible option. We can add more code to handle additional option types as we need them. Bad options or mangled option entries can result in ICMP Parameter Problem packets. The first types we support are the Timestamp option and the Record Route option, included in this change. The options are processed at several points in the packet flow within the Network stack, with slightly different requirements. The framework includes a mechanism to control this at each point. Support has been added for such points which are only present in upcoming CLs such as during packet forwarding and fragmentation. With this change, 'ping -R' and 'ping -T' work against gVisor and Fuchsia. $ ping -R 192.168.1.2 PING 192.168.1.2 (192.168.1.2) 56(124) bytes of data. 64 bytes from 192.168.1.2: icmp_seq=1 ttl=64 time=0.990 ms NOP RR: 192.168.1.1 192.168.1.2 192.168.1.1 $ ping -T tsprespec 192.168.1.2 192.168.1.1 192.168.1.2 PING 192.168.1.2 (192.168.1.2) 56(124) bytes of data. 64 bytes from 192.168.1.2: icmp_seq=1 ttl=64 time=1.20 ms TS: 192.168.1.2 71486821 absolute 192.168.1.1 746 Unit tests included for generic options, Timestamp options and Record Route options. PiperOrigin-RevId: 339379076
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