filters/cel: add k8s ip and cidr library functions #3211
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This simple PR adds CIDR and IP helpers from the k8s CEL libraries to our CEL filters.
This should enable users to write export filters in CEL that match IPs in kprobe events
using CIDR ranges etc.
For example, the following CEL expression written as a CEL filter would match kprobe
events where the first argument contains a socket with source address in CIDR range
10.0.0.0/16:
cidr('10.0.0.0/16').containsIP(process_kprobe.args[0].sock_arg.saddr)
The specific documentation for these CEL libraries is available here:
- https://pkg.go.dev/k8s.io/apiserver/pkg/cel/library#CIDR
- https://pkg.go.dev/k8s.io/apiserver/pkg/cel/library#IP
Signed-off-by: William Findlay <[email protected]>
Add CIDR and IP CEL extensions to the docs by sneaking them in through gRPC API documentation. A subsequent commit will add similar docs to the event filtering documentation. Signed-off-by: William Findlay <[email protected]>
Add docs for missing event filter types: - cel - container_id - in_init_tree Signed-off-by: William Findlay <[email protected]>
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This simple PR adds CIDR and IP helpers from the k8s CEL libraries to our CEL filters.
This should enable users to write export filters in CEL that match IPs in kprobe events
using CIDR ranges etc.
For example, the following CEL expression written as a CEL filter would match kprobe
events where the first argument contains a socket with source address in CIDR range
10.0.0.0/16:
The specific documentation for these CEL libraries is available here: