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#include <netgraph.h>
#include <netgraph/ng_tcpmss.h>
| NGM_TCPMSS_CONFIG ( config) | |
This control message configures node to do given MSS adjusting on
a particular hook.
It requires the
struct ng_tcpmss_config
to be supplied as an argument:
struct ng_tcpmss_config {
char inHook[NG_HOOKSIZ];
char outHook[NG_HOOKSIZ];
uint16_t maxMSS;
}
This means: packets received on inHook would be checked for TCP MSS option and the latter would be reduced down to maxMSS if it exceeds maxMSS. After that, packets would be sent to hook outHook. | |
| NGM_TCPMSS_GET_STATS ( getstats) | |
This control message obtains statistics for a given hook.
The statistics are returned in
struct ng_tcpmss_hookstat:
struct ng_tcpmss_hookstat {
uint64_t Octets; /* total bytes */
uint64_t Packets; /* total packets */
uint16_t maxMSS; /* maximum MSS */
uint64_t SYNPkts; /* TCP SYN packets */
uint64_t FixedPkts; /* changed packets */
};
| |
| NGM_TCPMSS_CLR_STATS ( clrstats) | |
| This control message clears statistics for a given hook. | |
| NGM_TCPMSS_GETCLR_STATS ( getclrstats) | |
| This control message obtains and clears statistics for a given hook. | |
# Create tcpmss node and connect it to ng_ipfw node ngctl mkpeer ipfw: tcpmss 100 qqq# Adjust MSS to 1452 ngctl msg ipfw:100 config '{ inHook="qqq" outHook="qqq" maxMSS=1452 }'
# Divert traffic into tcpmss node ipfw add 300 netgraph 100 tcp from any to any tcpflags syn out via fxp0
# Let packets continue with ipfw after being hacked sysctl net.inet.ip.fw.one_pass=0
| NG_TCPMSS (4) | June 9, 2005 |
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