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| author | Lorenzo Colitti <lorenzo@google.com> | 2014-02-10 09:20:05 +0900 |
|---|---|---|
| committer | Lorenzo Colitti <lorenzo@google.com> | 2014-02-14 13:33:04 +0900 |
| commit | 5a50c0283346a197cda7af19e68f611f14b8fe57 (patch) | |
| tree | 1cccafeba5bbd41374daa0aed35379faa4c26a88 /translate.h | |
| parent | a33592bd08a20c6a521b8508975b7a74ecdf4f03 (diff) | |
| download | android_external_android-clat-5a50c0283346a197cda7af19e68f611f14b8fe57.tar.gz android_external_android-clat-5a50c0283346a197cda7af19e68f611f14b8fe57.tar.bz2 android_external_android-clat-5a50c0283346a197cda7af19e68f611f14b8fe57.zip | |
Fix up checksums instead of recalculating them.
Currently the checksums of translated packets are calculated
from scratch by checksumming the translated packet. This is slow
and does not work in the case of fragments, because the whole
packet is not available. Instead, calculate the checksum by
adjusting the checksum of the original packet.
Bug: 11542311
Bug: 12116252
Change-Id: I6b78a94ca5bd96b13ee2653b6200551193b3dcc1
Diffstat (limited to 'translate.h')
| -rw-r--r-- | translate.h | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/translate.h b/translate.h index 9f1ac15..cfb7bbb 100644 --- a/translate.h +++ b/translate.h @@ -61,12 +61,14 @@ int icmp6_to_icmp(clat_packet out, int pos, const struct icmp6_hdr *icmp6, int generic_packet(clat_packet out, int pos, const char *payload, size_t len); // Translate TCP and UDP packets. -int tcp_packet(clat_packet out, int pos, const struct tcphdr *tcp, uint32_t checksum, size_t len); -int udp_packet(clat_packet out, int pos, const struct udphdr *udp, uint32_t checksum, size_t len); +int tcp_packet(clat_packet out, int pos, const struct tcphdr *tcp, + uint32_t old_sum, uint32_t new_sum, size_t len); +int udp_packet(clat_packet out, int pos, const struct udphdr *udp, + uint32_t old_sum, uint32_t new_sum, size_t len); int tcp_translate(clat_packet out, int pos, const struct tcphdr *tcp, size_t header_size, - uint32_t checksum, const char *payload, size_t payload_size); -int udp_translate(clat_packet out, int pos, const struct udphdr *udp, uint32_t checksum, - const char *payload, size_t payload_size); + uint32_t old_sum, uint32_t new_sum, const char *payload, size_t payload_size); +int udp_translate(clat_packet out, int pos, const struct udphdr *udp, + uint32_t old_sum, uint32_t new_sum, const char *payload, size_t payload_size); #endif /* __TRANSLATE_H__ */ |