SK_RUN_FILTER(9) Linux Networking SK_RUN_FILTER(9)NAME
sk_run_filter - run a filter on a socket
unsigned int sk_run_filter(const struct sk_buff * skb, const struct sock_filter * fentry);
buffer to run the filter on
filter to apply
Decode and apply filter instructions to the skb->data. Return length to keep, 0 for none. skb is the data we are filtering, filter is the
array of filter instructions. Because all jumps are guaranteed to be before last instruction, and last instruction guaranteed to be a RET,
we dont need to check flen. (We used to pass to this function the length of filter)
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SK_RUN_FILTER(9)
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smfi_register() - registers a set of filter callbacks for sendmail
descr Specifies a filter descriptor of type describing the filter's functions.
The creates a filter using the information given in the smfiDesc argument. must be called before the routine. Multiple calls to the rou-
tine within a single process is not allowed.
The structure has the following members:
A NULL value for any callback function indicates that the filter does not wish to process the given type of information and the filter
returns the value.
The flags field must contain the bitwise OR of 0 (zero) or more of the following values:
This filter adds headers.
This filter changes and deletes headers.
This filter replaces the body of the message during the filtering process.
may have significant performance impact if other filters do body filtering after
This filter adds recipients to the message.
This filter removes recipients from the
The routine may return for any of the following reasons:
o Memory allocation failure
o Incompatible version or illegal flags value
was developed by the Sendmail Inc.
SEE ASLO smfi_main(3N), smfi_setconn(3N), smfi_settimeout(3N), smfi_opensocket(3N), smfi_setbacklog(3N), smfi_setdbg(3N), smfi_stop(3N).
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