Hi,
I am trying my hand with the fbt provider and need some help in the
explaining my observation results.
------------------------------------------------
#!/usr/sbin/dtrace -s
fbt::ill_input_short_v4:entry
{
ip = (ipha_t *)args[1];
printf("%u\n",(ip->ipha_src));
}
-------------------------------------------------
Running the script generates lines upon lines of :
dtrace: error on enabled probe ID 1 (ID 44145:
fbt:ip:ill_input_short_v4:entry): invalid alignment (0xffffff014a8ec90e)
in action #2 at DIF offset 12
However,no error is observed when I replace ipha_src with any of the
first 8 members of ipha_s (ip_version_and_hdr_length to ipha_hdr_checksum)
-------------------------------------------------
From mdb -k
> ::print -t ipha_t
ipha_t {
uint8_t ipha_version_and_hdr_length
uint8_t ipha_type_of_service
uint16_t ipha_length
uint16_t ipha_ident
uint16_t ipha_fragment_offset_and_flags
uint8_t ipha_ttl
uint8_t ipha_protocol
uint16_t ipha_hdr_checksum
ipaddr_t ipha_src
ipaddr_t ipha_dst
}
>
From source,
#define _IPADDR_T
typedef uint32_t ipaddr_t;
#endif
Running sizeof(ipha_t) gives 20, which I think checks out at
(8+8+16+16+16+8+8+16+32+32)/8
-------------------------------------------------------------
Any ideas to get ipha_src print out properly ?
Many thanks,
Wei Liam
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