fix(tcpdump): partial checksum #1015
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whitequark
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Nov 29, 2024
src/wire/ip.rs
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| let partially_valid = udp_packet | ||
| .verify_partial_checksum(&repr.src_addr(), &repr.dst_addr()); | ||
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| format_checksum(f, valid || partially_valid) |
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I'd prefer different formatting for valid vs partially valid checksum, since this is a diagnostic interface.
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I modified the message when the partial checksum is correct.
thvdveld
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In some cases, the checksum calculation is offloaded to hardware and only the partial checksum is calculated (only the pseudo-header). The tcpdump example was not taking this into account and was flagging some packets with incorrect checksums.
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #1015 +/- ##
==========================================
+ Coverage 80.75% 80.77% +0.01%
==========================================
Files 81 81
Lines 28340 28415 +75
==========================================
+ Hits 22887 22953 +66
- Misses 5453 5462 +9 ☔ View full report in Codecov by Sentry. |
whitequark
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Nov 29, 2024
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In some cases, the checksum calculation is offloaded to hardware and only the partial checksum is calculated (only the pseudo-header). The tcpdump example was not taking this into account and was flagging some packets with incorrect checksums.