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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* BGP pbr
* Copyright (C) 6WIND
*/
#ifndef __BGP_PBR_H__
#define __BGP_PBR_H__
#include "nexthop.h"
#include "zclient.h"
/* flowspec case: 0 to 3 actions maximum:
* 1 redirect
* 1 set dscp
* 1 set traffic rate
*/
#define ACTIONS_MAX_NUM 4
enum bgp_pbr_action_enum {
ACTION_TRAFFICRATE = 1,
ACTION_TRAFFIC_ACTION = 2,
ACTION_REDIRECT = 3,
ACTION_MARKING = 4,
ACTION_REDIRECT_IP = 5
};
#define TRAFFIC_ACTION_SAMPLE (1 << 0)
#define TRAFFIC_ACTION_TERMINATE (1 << 1)
#define TRAFFIC_ACTION_DISTRIBUTE (1 << 2)
#define OPERATOR_COMPARE_LESS_THAN (1<<1)
#define OPERATOR_COMPARE_GREATER_THAN (1<<2)
#define OPERATOR_COMPARE_EQUAL_TO (1<<3)
#define OPERATOR_COMPARE_EXACT_MATCH (1<<4)
#define OPERATOR_UNARY_OR (1<<1)
#define OPERATOR_UNARY_AND (1<<2)
/* struct used to store values [0;65535]
* this can be used for port number of protocol
*/
#define BGP_PBR_MATCH_VAL_MAX 5
struct bgp_pbr_match_val {
uint16_t value;
uint8_t compare_operator;
uint8_t unary_operator;
};
#define FRAGMENT_DONT 1
#define FRAGMENT_IS 2
#define FRAGMENT_FIRST 4
#define FRAGMENT_LAST 8
struct bgp_pbr_entry_action {
/* used to store enum bgp_pbr_action_enum enumerate */
uint8_t action;
union {
union {
uint8_t rate_info[4]; /* IEEE.754.1985 */
float rate;
} r __attribute__((aligned(8)));
struct _pbr_action {
uint8_t do_sample;
uint8_t filter;
} za;
vrf_id_t redirect_vrf;
struct _pbr_redirect_ip {
struct in_addr redirect_ip_v4;
struct in6_addr redirect_ip_v6;
uint8_t duplicate;
} zr;
uint8_t marking_dscp;
} u __attribute__((aligned(8)));
};
/* BGP Policy Route structure */
struct bgp_pbr_entry_main {
#define BGP_PBR_UNDEFINED 0
#define BGP_PBR_IPSET 1
#define BGP_PBR_IPRULE 2
uint8_t type;
/*
* This is an enum but we are going to treat it as a uint8_t
* for purpose of encoding/decoding
*/
afi_t afi;
safi_t safi;
#define PREFIX_SRC_PRESENT (1 << 0)
#define PREFIX_DST_PRESENT (1 << 1)
uint8_t match_bitmask_iprule;
uint8_t match_bitmask;
uint8_t match_src_port_num;
uint8_t match_dst_port_num;
uint8_t match_port_num;
uint8_t match_protocol_num;
uint8_t match_icmp_type_num;
uint8_t match_icmp_code_num;
uint8_t match_packet_length_num;
uint8_t match_dscp_num;
uint8_t match_tcpflags_num;
uint8_t match_fragment_num;
uint8_t match_flowlabel_num;
struct prefix src_prefix;
struct prefix dst_prefix;
uint8_t src_prefix_offset;
uint8_t dst_prefix_offset;
#define PROTOCOL_UDP 17
#define PROTOCOL_TCP 6
#define PROTOCOL_ICMP 1
#define PROTOCOL_ICMPV6 58
struct bgp_pbr_match_val protocol[BGP_PBR_MATCH_VAL_MAX];
struct bgp_pbr_match_val src_port[BGP_PBR_MATCH_VAL_MAX];
struct bgp_pbr_match_val dst_port[BGP_PBR_MATCH_VAL_MAX];
struct bgp_pbr_match_val port[BGP_PBR_MATCH_VAL_MAX];
struct bgp_pbr_match_val icmp_type[BGP_PBR_MATCH_VAL_MAX];
struct bgp_pbr_match_val icmp_code[BGP_PBR_MATCH_VAL_MAX];
struct bgp_pbr_match_val packet_length[BGP_PBR_MATCH_VAL_MAX];
struct bgp_pbr_match_val dscp[BGP_PBR_MATCH_VAL_MAX];
struct bgp_pbr_match_val flow_label[BGP_PBR_MATCH_VAL_MAX];
struct bgp_pbr_match_val tcpflags[BGP_PBR_MATCH_VAL_MAX];
struct bgp_pbr_match_val fragment[BGP_PBR_MATCH_VAL_MAX];
uint16_t action_num;
struct bgp_pbr_entry_action actions[ACTIONS_MAX_NUM];
vrf_id_t vrf_id;
};
struct bgp_pbr_interface {
RB_ENTRY(bgp_pbr_interface) id_entry;
char name[IFNAMSIZ];
};
RB_HEAD(bgp_pbr_interface_head, bgp_pbr_interface);
RB_PROTOTYPE(bgp_pbr_interface_head, bgp_pbr_interface, id_entry,
bgp_pbr_interface_compare);
extern int bgp_pbr_interface_compare(const struct bgp_pbr_interface *a,
const struct bgp_pbr_interface *b);
struct bgp_pbr_config {
struct bgp_pbr_interface_head ifaces_by_name_ipv4;
bool pbr_interface_any_ipv4;
struct bgp_pbr_interface_head ifaces_by_name_ipv6;
bool pbr_interface_any_ipv6;
};
extern struct bgp_pbr_config *bgp_pbr_cfg;
struct bgp_pbr_rule {
uint32_t flags;
struct prefix src;
struct prefix dst;
struct bgp_pbr_action *action;
vrf_id_t vrf_id;
uint32_t unique;
uint32_t priority;
bool installed;
bool install_in_progress;
void *path;
};
struct bgp_pbr_match {
char ipset_name[ZEBRA_IPSET_NAME_SIZE];
/* mapped on enum ipset_type
*/
uint32_t type;
uint32_t flags;
uint8_t family;
uint16_t pkt_len_min;
uint16_t pkt_len_max;
uint16_t tcp_flags;
uint16_t tcp_mask_flags;
uint8_t dscp_value;
uint8_t fragment;
uint8_t protocol;
uint16_t flow_label;
vrf_id_t vrf_id;
/* unique identifier for ipset create transaction
*/
uint32_t unique;
/* unique identifier for iptable add transaction
*/
uint32_t unique2;
bool installed;
bool install_in_progress;
bool installed_in_iptable;
bool install_iptable_in_progress;
struct hash *entry_hash;
struct bgp_pbr_action *action;
};
struct bgp_pbr_match_entry {
struct bgp_pbr_match *backpointer;
uint32_t unique;
struct prefix src;
struct prefix dst;
uint16_t src_port_min;
uint16_t src_port_max;
uint16_t dst_port_min;
uint16_t dst_port_max;
uint8_t proto;
void *path;
bool installed;
bool install_in_progress;
};
struct bgp_pbr_action {
/*
* The Unique identifier of this specific pbrms
*/
uint32_t unique;
uint32_t fwmark;
uint32_t table_id;
float rate;
/*
* nexthop information, or drop information
* contains src vrf_id and nh contains dest vrf_id
*/
vrf_id_t vrf_id;
struct nexthop nh;
bool installed;
bool install_in_progress;
uint32_t refcnt;
struct bgp *bgp;
afi_t afi;
};
extern struct bgp_pbr_rule *bgp_pbr_rule_lookup(vrf_id_t vrf_id,
uint32_t unique);
extern struct bgp_pbr_action *bgp_pbr_action_rule_lookup(vrf_id_t vrf_id,
uint32_t unique);
extern struct bgp_pbr_match *bgp_pbr_match_ipset_lookup(vrf_id_t vrf_id,
uint32_t unique);
extern struct bgp_pbr_match_entry *bgp_pbr_match_ipset_entry_lookup(
vrf_id_t vrf_id, char *name,
uint32_t unique);
extern struct bgp_pbr_match *bgp_pbr_match_iptable_lookup(vrf_id_t vrf_id,
uint32_t unique);
extern void bgp_pbr_cleanup(struct bgp *bgp);
extern void bgp_pbr_init(struct bgp *bgp);
extern uint32_t bgp_pbr_rule_hash_key(const void *arg);
extern bool bgp_pbr_rule_hash_equal(const void *arg1,
const void *arg2);
extern uint32_t bgp_pbr_action_hash_key(const void *arg);
extern bool bgp_pbr_action_hash_equal(const void *arg1,
const void *arg2);
extern uint32_t bgp_pbr_match_entry_hash_key(const void *arg);
extern bool bgp_pbr_match_entry_hash_equal(const void *arg1,
const void *arg2);
extern uint32_t bgp_pbr_match_hash_key(const void *arg);
extern bool bgp_pbr_match_hash_equal(const void *arg1,
const void *arg2);
void bgp_pbr_print_policy_route(struct bgp_pbr_entry_main *api);
struct bgp_path_info;
extern void bgp_pbr_update_entry(struct bgp *bgp, const struct prefix *p,
struct bgp_path_info *new_select, afi_t afi,
safi_t safi, bool nlri_update);
/* bgp pbr utilities */
extern struct bgp_pbr_interface *pbr_interface_lookup(const char *name);
extern void bgp_pbr_reset(struct bgp *bgp, afi_t afi);
extern struct bgp_pbr_interface *bgp_pbr_interface_lookup(const char *name,
struct bgp_pbr_interface_head *head);
extern int bgp_pbr_build_and_validate_entry(const struct prefix *p,
struct bgp_path_info *path,
struct bgp_pbr_entry_main *api);
#endif /* __BGP_PBR_H__ */
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