OSDOCS-14366 Additional context about the multi-flow filtering capability, updated yaml

modules/network-observability-ebpf-rule-flow-filter.adoc

@@ -5,13 +5,15 @@
 :_mod-docs-content-type: CONCEPT
 [id="network-observability-ebpf-flow-rule-filter_{context}"]
 = eBPF flow rule filter
-You can use rule-based filtering to control the volume of packets cached in the eBPF flow table. For example, a filter can specify that only packets coming from port 100 should be recorded. Then only the packets that match the filter are cached and the rest are not cached. 
+You can use rule-based filtering to control the volume of packets cached in the eBPF flow table. For example, a filter can specify that only packets coming from port 100 should be captured. Then only the packets that match the filter are captured and the rest are dropped.
+
+You can apply multiple filter rules.
 
 [id="ingress-and-egress-traffic-filtering_{context}"]
 == Ingress and egress traffic filtering
-CIDR notation efficiently represents IP address ranges by combining the base IP address with a prefix length. For both ingress and egress traffic, the source IP address is first used to match filter rules configured with CIDR notation. If there is a match, then the filtering proceeds. If there is no match, then the destination IP is used to match filter rules configured with CIDR notation. 
+Classless Inter-Domain Routing (CIDR) notation efficiently represents IP address ranges by combining the base IP address with a prefix length. For both ingress and egress traffic, the source IP address is first used to match filter rules configured with CIDR notation. If there is a match, then the filtering proceeds. If there is no match, then the destination IP is used to match filter rules configured with CIDR notation.
 
-After matching either the source IP or the destination IP CIDR, you can pinpoint specific endpoints using the `peerIP` to differentiate the destination IP address of the packet. Based on the provisioned action, the flow data is either cached in the eBPF flow table or not cached. 
+After matching either the source IP or the destination IP CIDR, you can pinpoint specific endpoints using the `peerIP` to differentiate the destination IP address of the packet. Based on the provisioned action, the flow data is either cached in the eBPF flow table or not cached.
 
 [id="dashboard-and-metrics-integrations_{context}"]
 == Dashboard and metrics integrations

modules/network-observability-filtering-ebpf-rule.adoc

@@ -4,19 +4,26 @@
 
 :_mod-docs-content-type: PROCEDURE
 [id="network-observability-filtering-ebpf-rule_{context}"]
-= Filtering eBPF flow data using a global rule
-You can configure the `FlowCollector` to filter eBPF flows using a global rule to control the flow of packets cached in the eBPF flow table.
+= Filtering eBPF flow data using multiple rules
+You can configure the `FlowCollector` custom resource to filter eBPF flows using multiple rules to control the flow of packets cached in the eBPF flow table.
+
+[IMPORTANT]
+====
+* You cannot use duplicate CIDRs in filter rules.
+* When an IP address matches multiple filter rules, the rule with the most specific CIDR prefix (longest prefix) takes precedence.
+====
 
 .Procedure
 . In the web console, navigate to *Operators* -> *Installed Operators*.
 . Under the *Provided APIs* heading for *Network Observability*, select *Flow Collector*.
 . Select *cluster*, then select the *YAML* tab.
 . Configure the `FlowCollector` custom resource, similar to the following sample configurations:
 +
+--
+.Example YAML to sample all North-South traffic, and 1:50 East-West traffic
+
+By default, all other flows are rejected.
 
-[%collapsible]
-.Filter Kubernetes service traffic to a specific Pod IP endpoint
-====
 [source, yaml]
 ----
 apiVersion: flows.netobserv.io/v1beta2
@@ -30,22 +37,29 @@ spec:
     type: eBPF
     ebpf:
       flowFilter:
-        action: Accept  <1>
-        cidr: 172.210.150.1/24 <2>
-        protocol: SCTP
-        direction: Ingress
-        destPortRange: 80-100
-        peerIP: 10.10.10.10
-        enable: true    <3>
+        enable: true <1>
+        rules:
+         - action: Accept <2>
+           cidr: 0.0.0.0/0 <3>
+           sampling: 1 <4>
+         - action: Accept
+           cidr: 10.128.0.0/14
+           peerCIDR: 10.128.0.0/14 <5>
+         - action: Accept
+           cidr: 172.30.0.0/16
+           peerCIDR: 10.128.0.0/14
+           sampling: 50
 ----
-<1> The required `action` parameter describes the action that is taken for the flow filter rule. Possible values are `Accept` or `Reject`. 
-<2> The required `cidr` parameter provides the IP address and CIDR mask for the flow filter rule and supports IPv4 and IPv6 address formats. If you want to match against any IP address, you can use `0.0.0.0/0` for IPv4 or `::/0` for IPv6.
-<3> You must set `spec.agent.ebpf.flowFilter.enable` to `true` to enable this feature.
-====
-+
-[%collapsible]
-.See flows to any addresses outside the cluster 
-====
+<1> To enable eBPF flow filtering, set `spec.agent.ebpf.flowFilter.enable` to `true`.
+<2> To define the action for the flow filter rule, set the required `action` parameter. Valid values are `Accept` or `Reject`.
+<3> To define the IP address and CIDR mask for the flow filter rule, set the required `cidr` parameter. This parameter supports both IPv4 and IPv6 address formats. To match any IP address, use 0.0.0.0/0 for IPv4 or ::/0 for IPv6.
+<4> To define the sampling rate for matched flows and override the global sampling setting `spec.agent.ebpf.sampling`, set the `sampling` parameter.
+<5> To filter flows by Peer IP CIDR, set the `peerCIDR` parameter.
+
+.Example YAML to filter flows with packet drops
+
+By default, all other flows are rejected.
+
 [source, yaml]
 ----
 apiVersion: flows.netobserv.io/v1beta2
@@ -57,18 +71,20 @@ spec:
   deploymentModel: Direct
   agent:
     type: eBPF
-    ebpf:        
+    ebpf:
+      privileged: true <1>
+      features:
+        - PacketDrop <2>
       flowFilter:
-        action: Accept  <1>
-        cidr: 0.0.0.0/0 <2>
-        protocol: TCP
-        direction: Egress
-        sourcePort: 100
-        peerIP: 192.168.127.12 <3>
-        enable: true    <4>
-----       
-<1> You can `Accept` flows based on the criteria in the `flowFilter` specification.
-<2> The `cidr` value of `0.0.0.0/0` matches against any IP address.
-<3> See flows after `peerIP` is configured with `192.168.127.12`. 
-<4> You must set `spec.agent.ebpf.flowFilter.enable` to `true` to enable the feature.
-====
+        enable: true <3>
+        rules:
+        - action: Accept <4>
+          cidr: 172.30.0.0/16
+          pktDrops: true <5>
+----
+<1> To enable packet drops, set `spec.agent.ebpf.privileged` to `true`.
+<2> To report packet drops for each network flow, add the `PacketDrop` value to the `spec.agent.ebpf.features` list.
+<3> To enable eBPF flow filtering, set `spec.agent.ebpf.flowFilter.enable` to `true`.
+<4> To define the action for the flow filter rule, set the required `action` parameter. Valid values are `Accept` or `Reject`.
+<5> To filter flows containing drops, set `pktDrops` to `true`.
+--

modules/network-observability-flowcollector-api-specifications.adoc

@@ -444,7 +444,6 @@ To filter two ports, use a "port1,port2" in string format. For example, `ports:
 | `rules` defines a list of filtering rules on the eBPF Agents.
 When filtering is enabled, by default, flows that don't match any rule are rejected.
 To change the default, you can define a rule that accepts everything: `{ action: "Accept", cidr: "0.0.0.0/0" }`, and then refine with rejecting rules.
-Unsupported *.
 
 | `sampling`
 | `integer`
@@ -470,7 +469,6 @@ Description::
 `rules` defines a list of filtering rules on the eBPF Agents.
 When filtering is enabled, by default, flows that don't match any rule are rejected.
 To change the default, you can define a rule that accepts everything: `{ action: "Accept", cidr: "0.0.0.0/0" }`, and then refine with rejecting rules.
-Unsupported *.
 --
 
 Type::
@@ -483,7 +481,7 @@ Type::
 Description::
 +
 --
-`EBPFFlowFilterRule` defines the desired eBPF agent configuration regarding flow filtering rule.
+`EBPFFlowFilterRules` defines the desired eBPF agent configuration regarding flow filtering rules.
 --
 
 Type::
@@ -1480,15 +1478,15 @@ Type::
 
 | `input`
 | `string`
-| 
+|
 
 | `multiplier`
 | `integer`
-| 
+|
 
 | `output`
 | `string`
-| 
+|
 
 |===
 == .spec.exporters[].openTelemetry.logs