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7.8.1.Packet filter: pf #
-
; struct pf_rdr oldrdr; struct pf_rdr newrdr; };
Adds or removes a redirect rule in the active redirect rule set.
- DIOCSETTIMEOUT struct pfioc_tm
-
struct pfioc_tm { int timeout; int seconds; };
Sets the state timeout of timeout to seconds. The old value is placed into seconds. For the possible values of timeout, see the PFTM_* values in <netinet/pfvar.h>.
- DIOCGETTIMEOUT struct pfioc_tm
- Gets the state timeout of timeout to seconds.
- DIOCSETLIMIT struct pfioc_limit
-
struct pfioc_limit { int index; unsigned limit; };
Sets hard limits on the memory pools used by the packet filter. For the possible values of index, see the PF_LIMIT_* values in <netinet/pfvar.h>.
- DIOCGETLIMIT struct pfioc_limit
- Gets hard limits on the memory pools used by the packet filter.
Compiler options
To manage RAM and ROM sizes used by pf, it has several compiler options in the file <tcpdconfig.h> from tcp-server directory. These defines can disable and enable some functionality and change pf takes memory.
- PACKET_FILTER
- Enable/disable whole pf functionality.
- PF_MODIFY_ENTRY
- Modify pf entry support (get and change).
Dependent ioctl() commands:
– DIOCGETRULES, DIOCGETRULE, DIOCCHANGERULE
– DIOCGETNATS, DIOCGETNAT, DIOCCHANGENAT
– DIOCGETBINATS, DIOCGETBINAT, DIOCCHANGEBINAT
– DIOCGETRDRS, DIOCGETRDR, DIOCCHANGERDR
- PF_STATE_CTRL
- Additional commands for state control (ADD and GET).
Dependent ioctl() commands:
– DIOCCLRSTATES
– DIOCKILLSTATES
– DIOCADDSTATE
– DIOCGETSTATE
– DIOCGETSTATES
- PF_TIME_MEMORY_CTRL
- Extended control for timeouts and memory limits.
Dependent ioctl() commands:
– DIOCSETTIMEOUT
– DIOCGETTIMEOUT
– DIOCGETLIMIT
– DIOCSETLIMIT
- PF_STATISTICS
- Calculate statistics.
Dependent ioctl() commands:
– DIOCSETSTATUSIF
– DIOCCLRSTATUS
- PF_NAT_SUPPORT
- Support NAT capabilities (NAT, BINAT and RDR).
Dependent ioctl() commands:
– DIOCBEGINNATS, DIOCADDNAT, DIOCCOMMITNATS
– DIOCGETNATS, DIOCGETNAT, DIOCCHANGENAT
– DIOCBEGINBINATS, DIOCADDBINAT, DIOCCOMMITBINATS
– DIOCGETBINATS, DIOCGETBINAT, DIOCCHANGEBINAT
– DIOCBEGINRDRS, DIOCADDRDR, DIOCCOMMITRDRS
– DIOCGETRDRS, DIOCGETRDR, DIOCCHANGERDR
– DIOCNATLOOK
- PF_NATLOOKUP
- Looks up a NAT entry.
Dependent ioctl() commands:
– DIOCNATLOOK
Note that some ioctl() commands can dependent on several compiler options!
EXAMPLE
The following example demonstrates how to use the DIOCNATLOOK command to find the external host/port of a NATed connection.
void nat_lookup(void) { struct pfioc_natlook nl; int s; /* * open control socket */ s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if (s < 0) { printf("pf sock open error %d\n", errno); return; } else printf("pf sock %d\n", s); memset(&nl, 0, sizeof(struct pfioc_natlook)); nl.saddr.v4.s_addr = inet_addr("192.168.20.227"); nl.sport = htons(2000); nl.daddr.v4.s_addr = inet_addr("192.168.17.2"); nl.dport = htons(2000); nl.af = AF_INET; nl.proto = IPPROTO_TCP; nl.direction = PF_OUT; if (ioctl(s, DIOCNATLOOK, &nl)) { printf("DIOCNATLOOK err\n"); close(s); return; } printf("external host %s:%d\n", inet_ntoa(nl.rdaddr.v4), ntohs(nl.rdport)); close(s); return; }
NOTES
There is a demo available for the Unison and DSPnano pf which is found in installdir/demos.