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// SPDX-License-Identifier: GPL-2.0-or-later
/* Policy Based Routing (PBR) main header
* Copyright (C) 2018 6WIND
* Portions:
* Copyright (c) 2021 The MITRE Corporation.
* Copyright (c) 2023 LabN Consulting, L.L.C.
*/
#ifndef _PBR_H
#define _PBR_H
#include <zebra.h>
#include "stream.h"
#include "prefix.h"
#ifdef __cplusplus
extern "C" {
#endif
#define PBR_STR "Policy Based Routing\n"
/*
* A PBR filter
*
* The filter or match criteria in a PBR rule.
* For simplicity, all supported filters are grouped into a structure rather
* than delineating further. A bitmask denotes which filters are actually
* specified.
*/
struct pbr_filter {
uint32_t filter_bm;
#define PBR_FILTER_SRC_IP (1 << 0)
#define PBR_FILTER_DST_IP (1 << 1)
#define PBR_FILTER_SRC_PORT (1 << 2)
#define PBR_FILTER_DST_PORT (1 << 3)
#define PBR_FILTER_FWMARK (1 << 4)
#define PBR_FILTER_IP_PROTOCOL (1 << 5)
#define PBR_FILTER_SRC_PORT_RANGE (1 << 6)
#define PBR_FILTER_DST_PORT_RANGE (1 << 7)
#define PBR_FILTER_DSCP (1 << 8)
#define PBR_FILTER_ECN (1 << 9)
#define PBR_FILTER_PCP (1 << 10)
#define PBR_FILTER_VLAN_FLAGS (1 << 11)
#define PBR_FILTER_VLAN_ID (1 << 12)
#define PBR_DSFIELD_DSCP (0xfc) /* Upper 6 bits of DS field: DSCP */
#define PBR_DSFIELD_ECN (0x03) /* Lower 2 bits of DS field: BCN */
#define PBR_PCP (0x07) /* 3-bit value 0..7 for prioritization*/
#define PBR_VLAN_FLAGS_NO_WILD 0
#define PBR_VLAN_FLAGS_TAGGED (1 << 0)
#define PBR_VLAN_FLAGS_UNTAGGED (1 << 1)
#define PBR_VLAN_FLAGS_UNTAGGED_0 (1 << 2)
/* Source and Destination IP address with masks */
struct prefix src_ip;
struct prefix dst_ip;
/* Source and Destination layer 4 (TCP/UDP/etc.) port numbers */
uint16_t src_port;
uint16_t dst_port;
/* Filter by VLAN and prioritization */
uint8_t pcp;
uint16_t vlan_id;
uint16_t vlan_flags;
/* Filter by Differentiated Services field */
uint8_t dsfield; /* DSCP (6 bits) & ECN (2 bits) */
/* Filter with fwmark */
uint32_t fwmark;
/* Filter with the ip protocol */
uint8_t ip_proto;
};
/*
* A PBR action
*
* The action corresponding to a PBR rule.
* While the user specifies the action in a particular way, the forwarding
* plane implementation (Linux only) requires that to be encoded into a
* route table and the rule then point to that route table; in some cases,
* the user criteria may directly point to a table too.
*/
struct pbr_action {
uint32_t flags;
#define PBR_ACTION_TABLE (1 << 0)
#define PBR_ACTION_QUEUE_ID (1 << 1)
#define PBR_ACTION_PCP (1 << 2)
#define PBR_ACTION_VLAN_ID (1 << 3)
#define PBR_ACTION_VLAN_STRIP_INNER_ANY (1 << 4)
#define PBR_ACTION_SRC_IP (1 << 5)
#define PBR_ACTION_DST_IP (1 << 6)
#define PBR_ACTION_SRC_PORT (1 << 7)
#define PBR_ACTION_DST_PORT (1 << 8)
#define PBR_ACTION_DSCP (1 << 9)
#define PBR_ACTION_ECN (1 << 10)
#define PBR_ACTION_DROP (1 << 11) /* nexthop == blackhole */
uint32_t table;
uint32_t queue_id;
/* VLAN */
uint8_t pcp;
uint16_t vlan_id;
/* Source and Destination IP addresses */
union sockunion src_ip;
union sockunion dst_ip;
/* Source and Destination layer 4 (TCP/UDP/etc.) port numbers */
uint32_t src_port;
uint32_t dst_port;
/* Differentiated Services field */
uint8_t dscp; /* stored here already shifted to upper 6 bits */
uint8_t ecn; /* stored here as lower 2 bits */
};
/*
* A PBR rule
*
* This is a combination of the filter criteria and corresponding action.
* Rules also have a user-defined sequence number which defines the relative
* order amongst rules.
*/
struct pbr_rule {
vrf_id_t vrf_id;
uint8_t family; /* netlink: select which rule database */
uint32_t seq;
uint32_t priority;
uint32_t unique;
struct pbr_filter filter;
struct pbr_action action;
char ifname[IFNAMSIZ + 1];
};
/* TCP flags value shared
* those are values of byte 13 of TCP header
* as mentioned in rfc793
*/
#define TCP_HEADER_FIN (0x01)
#define TCP_HEADER_SYN (0x02)
#define TCP_HEADER_RST (0x04)
#define TCP_HEADER_PSH (0x08)
#define TCP_HEADER_ACK (0x10)
#define TCP_HEADER_URG (0x20)
#define TCP_HEADER_ALL_FLAGS (TCP_HEADER_FIN | TCP_HEADER_SYN \
| TCP_HEADER_RST | TCP_HEADER_PSH \
| TCP_HEADER_ACK | TCP_HEADER_URG)
/* Pbr IPTable defines
* those are common flags shared between BGP and Zebra
*/
#define MATCH_IP_SRC_SET (1 << 0)
#define MATCH_IP_DST_SET (1 << 1)
#define MATCH_PORT_SRC_SET (1 << 2)
#define MATCH_PORT_DST_SET (1 << 3)
#define MATCH_PORT_SRC_RANGE_SET (1 << 4)
#define MATCH_PORT_DST_RANGE_SET (1 << 5)
#define MATCH_DSCP_SET (1 << 6)
#define MATCH_DSCP_INVERSE_SET (1 << 7)
#define MATCH_PKT_LEN_INVERSE_SET (1 << 8)
#define MATCH_FRAGMENT_INVERSE_SET (1 << 9)
#define MATCH_ICMP_SET (1 << 10)
#define MATCH_PROTOCOL_SET (1 << 11)
#define MATCH_FLOW_LABEL_SET (1 << 12)
#define MATCH_FLOW_LABEL_INVERSE_SET (1 << 13)
extern int zapi_pbr_rule_encode(struct stream *s, struct pbr_rule *r);
extern bool zapi_pbr_rule_decode(struct stream *s, struct pbr_rule *r);
#ifdef __cplusplus
}
#endif
#endif /* _PBR_H */
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