diff options
Diffstat (limited to 'share/man/man4/ng_bpf.4')
| -rw-r--r-- | share/man/man4/ng_bpf.4 | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/share/man/man4/ng_bpf.4 b/share/man/man4/ng_bpf.4 index 1c24b0786e26..c63c89cd97fa 100644 --- a/share/man/man4/ng_bpf.4 +++ b/share/man/man4/ng_bpf.4 @@ -51,7 +51,8 @@ node type allows Berkeley Packet Filter (see .Xr bpf 4 ) filters to be applied to data travelling through a Netgraph network. Each node allows an arbitrary number of connections to arbitrarily -named hooks. With each hook is associated a +named hooks. +With each hook is associated a .Xr bpf 4 filter program which is applied to incoming data only, a destination hook for matching packets, a destination hook for non-matching packets, @@ -60,7 +61,8 @@ and various statistics counters. A .Xr bpf 4 program returns an unsigned integer, which is normally interpreted as -the length of the prefix of the packet to return. In the context of this +the length of the prefix of the packet to return. +In the context of this node type, returning zero is considered a non-match, in which case the entire packet is delivered out the non-match destination hook. Returning a value greater than zero causes the packet to be truncated @@ -79,7 +81,8 @@ This node type supports the generic control messages, plus the following: .Bl -tag -width foo .It Dv NGM_BPF_SET_PROGRAM This command sets the filter program that will be applied to incoming -data on a hook. The following structure must be supplied as an argument: +data on a hook. +The following structure must be supplied as an argument: .Bd -literal -offset 4n struct ng_bpf_hookprog { char thisHook[NG_HOOKSIZ]; /* name of hook */ @@ -101,7 +104,8 @@ Matching and non-matching incoming packets are delivered out the hooks named .Dv ifMatch and .Dv ifNotMatch , -respectively. The program must be a valid +respectively. +The program must be a valid .Xr bpf 4 program or else .Er EINVAL |