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null_encrypt() needs to copy the data in case src and dst are disjunct,
null_compress() needs to copy the data in any case as far as I can tell. I
joined compress/decompress and encrypt/decrypt to avoid duplicating code.
Without this patch ESP null_enc packets look like this:
IP (tos 0x0, ttl 64, id 23130, offset 0, flags [DF], length: 128)
10.0.0.1 > 10.0.0.2: ESP(spi=0x0f9ca149,seq=0x4)
0x0000: 4500 0080 5a5a 4000 4032 cbef 0a00 0001 E...ZZ@.@2......
0x0010: 0a00 0002 0f9c a149 0000 0004 0000 0000 .......I........
0x0020: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0030: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0040: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0050: 0000 ..
IP (tos 0x0, ttl 64, id 256, offset 0, flags [DF], length: 128)
10.0.0.2 > 10.0.0.1: ESP(spi=0x0e4f7b51,seq=0x2)
0x0000: 4500 0080 0100 4000 4032 254a 0a00 0002 E.....@.@2%J....
0x0010: 0a00 0001 0e4f 7b51 0000 0002 a8a8 a8a8 .....O{Q........
0x0020: a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 ................
0x0030: a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 ................
0x0040: a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 a8a8 ................
0x0050: a8a8 ..
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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