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bgp_pbr.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* BGP pbr
* Copyright (C) 6WIND
*/
#include "zebra.h"
#include "prefix.h"
#include "zclient.h"
#include "jhash.h"
#include "pbr.h"
#include "lib/printfrr.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_pbr.h"
#include "bgpd/bgp_debug.h"
#include "bgpd/bgp_flowspec_util.h"
#include "bgpd/bgp_ecommunity.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_zebra.h"
#include "bgpd/bgp_mplsvpn.h"
#include "bgpd/bgp_flowspec_private.h"
#include "bgpd/bgp_errors.h"
DEFINE_MTYPE_STATIC(BGPD, PBR_MATCH_ENTRY, "PBR match entry");
DEFINE_MTYPE_STATIC(BGPD, PBR_MATCH, "PBR match");
DEFINE_MTYPE_STATIC(BGPD, PBR_ACTION, "PBR action");
DEFINE_MTYPE_STATIC(BGPD, PBR_RULE, "PBR rule");
DEFINE_MTYPE_STATIC(BGPD, PBR, "BGP PBR Context");
DEFINE_MTYPE_STATIC(BGPD, PBR_VALMASK, "BGP PBR Val Mask Value");
/* chain strings too long to fit in one line */
#define FSPEC_ACTION_EXCEED_LIMIT "flowspec actions exceeds limit"
#define IPV6_FRAGMENT_INVALID "fragment not valid for IPv6 for this implementation"
RB_GENERATE(bgp_pbr_interface_head, bgp_pbr_interface,
id_entry, bgp_pbr_interface_compare);
struct bgp_pbr_interface_head ifaces_by_name_ipv4 =
RB_INITIALIZER(&ifaces_by_name_ipv4);
static int bgp_pbr_match_counter_unique;
static int bgp_pbr_match_entry_counter_unique;
static int bgp_pbr_action_counter_unique;
static int bgp_pbr_match_iptable_counter_unique;
struct bgp_pbr_match_iptable_unique {
uint32_t unique;
struct bgp_pbr_match *bpm_found;
};
struct bgp_pbr_match_entry_unique {
uint32_t unique;
struct bgp_pbr_match_entry *bpme_found;
};
struct bgp_pbr_action_unique {
uint32_t unique;
struct bgp_pbr_action *bpa_found;
};
struct bgp_pbr_rule_unique {
uint32_t unique;
struct bgp_pbr_rule *bpr_found;
};
static int bgp_pbr_rule_walkcb(struct hash_bucket *bucket, void *arg)
{
struct bgp_pbr_rule *bpr = (struct bgp_pbr_rule *)bucket->data;
struct bgp_pbr_rule_unique *bpru = (struct bgp_pbr_rule_unique *)
arg;
uint32_t unique = bpru->unique;
if (bpr->unique == unique) {
bpru->bpr_found = bpr;
return HASHWALK_ABORT;
}
return HASHWALK_CONTINUE;
}
static int bgp_pbr_action_walkcb(struct hash_bucket *bucket, void *arg)
{
struct bgp_pbr_action *bpa = (struct bgp_pbr_action *)bucket->data;
struct bgp_pbr_action_unique *bpau = (struct bgp_pbr_action_unique *)
arg;
uint32_t unique = bpau->unique;
if (bpa->unique == unique) {
bpau->bpa_found = bpa;
return HASHWALK_ABORT;
}
return HASHWALK_CONTINUE;
}
static int bgp_pbr_match_entry_walkcb(struct hash_bucket *bucket, void *arg)
{
struct bgp_pbr_match_entry *bpme =
(struct bgp_pbr_match_entry *)bucket->data;
struct bgp_pbr_match_entry_unique *bpmeu =
(struct bgp_pbr_match_entry_unique *)arg;
uint32_t unique = bpmeu->unique;
if (bpme->unique == unique) {
bpmeu->bpme_found = bpme;
return HASHWALK_ABORT;
}
return HASHWALK_CONTINUE;
}
struct bgp_pbr_match_ipsetname {
char *ipsetname;
struct bgp_pbr_match *bpm_found;
};
static int bgp_pbr_match_pername_walkcb(struct hash_bucket *bucket, void *arg)
{
struct bgp_pbr_match *bpm = (struct bgp_pbr_match *)bucket->data;
struct bgp_pbr_match_ipsetname *bpmi =
(struct bgp_pbr_match_ipsetname *)arg;
char *ipset_name = bpmi->ipsetname;
if (!strncmp(ipset_name, bpm->ipset_name,
ZEBRA_IPSET_NAME_SIZE)) {
bpmi->bpm_found = bpm;
return HASHWALK_ABORT;
}
return HASHWALK_CONTINUE;
}
static int bgp_pbr_match_iptable_walkcb(struct hash_bucket *bucket, void *arg)
{
struct bgp_pbr_match *bpm = (struct bgp_pbr_match *)bucket->data;
struct bgp_pbr_match_iptable_unique *bpmiu =
(struct bgp_pbr_match_iptable_unique *)arg;
uint32_t unique = bpmiu->unique;
if (bpm->unique2 == unique) {
bpmiu->bpm_found = bpm;
return HASHWALK_ABORT;
}
return HASHWALK_CONTINUE;
}
struct bgp_pbr_match_unique {
uint32_t unique;
struct bgp_pbr_match *bpm_found;
};
static int bgp_pbr_match_walkcb(struct hash_bucket *bucket, void *arg)
{
struct bgp_pbr_match *bpm = (struct bgp_pbr_match *)bucket->data;
struct bgp_pbr_match_unique *bpmu = (struct bgp_pbr_match_unique *)
arg;
uint32_t unique = bpmu->unique;
if (bpm->unique == unique) {
bpmu->bpm_found = bpm;
return HASHWALK_ABORT;
}
return HASHWALK_CONTINUE;
}
static int snprintf_bgp_pbr_match_val(char *str, int len,
struct bgp_pbr_match_val *mval,
const char *prepend)
{
char *ptr = str;
int delta;
if (prepend) {
delta = snprintf(ptr, len, "%s", prepend);
ptr += delta;
len -= delta;
} else {
if (mval->unary_operator & OPERATOR_UNARY_OR) {
delta = snprintf(ptr, len, ", or ");
ptr += delta;
len -= delta;
}
if (mval->unary_operator & OPERATOR_UNARY_AND) {
delta = snprintf(ptr, len, ", and ");
ptr += delta;
len -= delta;
}
}
if (mval->compare_operator & OPERATOR_COMPARE_LESS_THAN) {
delta = snprintf(ptr, len, "<");
ptr += delta;
len -= delta;
}
if (mval->compare_operator & OPERATOR_COMPARE_GREATER_THAN) {
delta = snprintf(ptr, len, ">");
ptr += delta;
len -= delta;
}
if (mval->compare_operator & OPERATOR_COMPARE_EQUAL_TO) {
delta = snprintf(ptr, len, "=");
ptr += delta;
len -= delta;
}
if (mval->compare_operator & OPERATOR_COMPARE_EXACT_MATCH) {
delta = snprintf(ptr, len, "match");
ptr += delta;
len -= delta;
}
ptr += snprintf(ptr, len, " %u", mval->value);
return (int)(ptr - str);
}
#define INCREMENT_DISPLAY(_ptr, _cnt, _len) do { \
int sn_delta; \
\
if (_cnt) { \
sn_delta = snprintf((_ptr), (_len), "; ");\
(_len) -= sn_delta; \
(_ptr) += sn_delta; \
} \
(_cnt)++; \
} while (0)
/* this structure can be used for port range,
* but also for other values range like packet length range
*/
struct bgp_pbr_range_port {
uint16_t min_port;
uint16_t max_port;
};
/* this structure can be used to filter with a mask
* for instance it supports not instructions like for
* tcpflags
*/
struct bgp_pbr_val_mask {
uint16_t val;
uint16_t mask;
};
/* this structure is used to pass instructs
* so that BGP can create pbr instructions to ZEBRA
*/
struct bgp_pbr_filter {
uint8_t type;
vrf_id_t vrf_id;
uint8_t family;
struct prefix *src;
struct prefix *dst;
uint8_t bitmask_iprule;
uint8_t protocol;
struct bgp_pbr_range_port *pkt_len;
struct bgp_pbr_range_port *src_port;
struct bgp_pbr_range_port *dst_port;
struct bgp_pbr_val_mask *tcp_flags;
struct bgp_pbr_val_mask *dscp;
struct bgp_pbr_val_mask *flow_label;
struct bgp_pbr_val_mask *pkt_len_val;
struct bgp_pbr_val_mask *fragment;
};
/* this structure is used to contain OR instructions
* so that BGP can create multiple pbr instructions
* to ZEBRA
*/
struct bgp_pbr_or_filter {
struct list *tcpflags;
struct list *dscp;
struct list *flowlabel;
struct list *pkt_len;
struct list *fragment;
struct list *icmp_type;
struct list *icmp_code;
};
static void bgp_pbr_policyroute_add_to_zebra_unit(struct bgp *bgp,
struct bgp_path_info *path,
struct bgp_pbr_filter *bpf,
struct nexthop *nh,
float *rate);
static void bgp_pbr_dump_entry(struct bgp_pbr_filter *bpf, bool add);
static bool bgp_pbr_extract_enumerate_unary_opposite(
uint8_t unary_operator,
struct bgp_pbr_val_mask *and_valmask,
struct list *or_valmask, uint32_t value,
uint8_t type_entry)
{
if (unary_operator == OPERATOR_UNARY_AND && and_valmask) {
if (type_entry == FLOWSPEC_TCP_FLAGS) {
and_valmask->mask |=
TCP_HEADER_ALL_FLAGS &
~(value);
} else if (type_entry == FLOWSPEC_DSCP ||
type_entry == FLOWSPEC_FLOW_LABEL ||
type_entry == FLOWSPEC_PKT_LEN ||
type_entry == FLOWSPEC_FRAGMENT) {
and_valmask->val = value;
and_valmask->mask = 1; /* inverse */
}
} else if (unary_operator == OPERATOR_UNARY_OR && or_valmask) {
and_valmask = XCALLOC(MTYPE_PBR_VALMASK,
sizeof(struct bgp_pbr_val_mask));
if (type_entry == FLOWSPEC_TCP_FLAGS) {
and_valmask->val = TCP_HEADER_ALL_FLAGS;
and_valmask->mask |=
TCP_HEADER_ALL_FLAGS &
~(value);
} else if (type_entry == FLOWSPEC_DSCP ||
type_entry == FLOWSPEC_FLOW_LABEL ||
type_entry == FLOWSPEC_FRAGMENT ||
type_entry == FLOWSPEC_PKT_LEN) {
and_valmask->val = value;
and_valmask->mask = 1; /* inverse */
}
listnode_add(or_valmask, and_valmask);
} else if (type_entry == FLOWSPEC_ICMP_CODE ||
type_entry == FLOWSPEC_ICMP_TYPE)
return false;
return true;
}
/* TCP : FIN and SYN -> val = ALL; mask = 3
* TCP : not (FIN and SYN) -> val = ALL; mask = ALL & ~(FIN|RST)
* other variables type: dscp, pkt len, fragment, flow label
* - value is copied in bgp_pbr_val_mask->val value
* - if negate form is identifierd, bgp_pbr_val_mask->mask set to 1
*/
static bool bgp_pbr_extract_enumerate_unary(struct bgp_pbr_match_val list[],
int num, uint8_t unary_operator,
void *valmask, uint8_t type_entry)
{
int i = 0;
struct bgp_pbr_val_mask *and_valmask = NULL;
struct list *or_valmask = NULL;
bool ret;
if (valmask) {
if (unary_operator == OPERATOR_UNARY_AND) {
and_valmask = (struct bgp_pbr_val_mask *)valmask;
memset(and_valmask, 0, sizeof(struct bgp_pbr_val_mask));
} else if (unary_operator == OPERATOR_UNARY_OR) {
or_valmask = (struct list *)valmask;
}
}
for (i = 0; i < num; i++) {
if (i != 0 && list[i].unary_operator !=
unary_operator)
return false;
if (!(list[i].compare_operator &
OPERATOR_COMPARE_EQUAL_TO) &&
!(list[i].compare_operator &
OPERATOR_COMPARE_EXACT_MATCH)) {
if ((list[i].compare_operator &
OPERATOR_COMPARE_LESS_THAN) &&
(list[i].compare_operator &
OPERATOR_COMPARE_GREATER_THAN)) {
ret = bgp_pbr_extract_enumerate_unary_opposite(
unary_operator, and_valmask,
or_valmask, list[i].value,
type_entry);
if (!ret)
return ret;
continue;
}
return false;
}
if (unary_operator == OPERATOR_UNARY_AND && and_valmask) {
if (type_entry == FLOWSPEC_TCP_FLAGS)
and_valmask->mask |=
TCP_HEADER_ALL_FLAGS & list[i].value;
} else if (unary_operator == OPERATOR_UNARY_OR && or_valmask) {
and_valmask = XCALLOC(MTYPE_PBR_VALMASK,
sizeof(struct bgp_pbr_val_mask));
if (type_entry == FLOWSPEC_TCP_FLAGS) {
and_valmask->val = TCP_HEADER_ALL_FLAGS;
and_valmask->mask |=
TCP_HEADER_ALL_FLAGS & list[i].value;
} else if (type_entry == FLOWSPEC_DSCP ||
type_entry == FLOWSPEC_FLOW_LABEL ||
type_entry == FLOWSPEC_ICMP_TYPE ||
type_entry == FLOWSPEC_ICMP_CODE ||
type_entry == FLOWSPEC_FRAGMENT ||
type_entry == FLOWSPEC_PKT_LEN)
and_valmask->val = list[i].value;
listnode_add(or_valmask, and_valmask);
}
}
if (unary_operator == OPERATOR_UNARY_AND && and_valmask
&& type_entry == FLOWSPEC_TCP_FLAGS)
and_valmask->val = TCP_HEADER_ALL_FLAGS;
return true;
}
/* if unary operator can either be UNARY_OR/AND/OR-AND.
* in the latter case, combinationf of both is not handled
*/
static bool bgp_pbr_extract_enumerate(struct bgp_pbr_match_val list[],
int num, uint8_t unary_operator,
void *valmask, uint8_t type_entry)
{
bool ret;
uint8_t unary_operator_val;
bool double_check = false;
if ((unary_operator & OPERATOR_UNARY_OR) &&
(unary_operator & OPERATOR_UNARY_AND)) {
unary_operator_val = OPERATOR_UNARY_AND;
double_check = true;
} else
unary_operator_val = unary_operator;
ret = bgp_pbr_extract_enumerate_unary(list, num, unary_operator_val,
valmask, type_entry);
if (!ret && double_check)
ret = bgp_pbr_extract_enumerate_unary(list, num,
OPERATOR_UNARY_OR,
valmask,
type_entry);
return ret;
}
/* returns the unary operator that is in the list
* return 0 if both operators are used
*/
static uint8_t bgp_pbr_match_val_get_operator(struct bgp_pbr_match_val list[],
int num)
{
int i;
uint8_t unary_operator = OPERATOR_UNARY_AND;
for (i = 0; i < num; i++) {
if (i == 0)
continue;
if (list[i].unary_operator & OPERATOR_UNARY_OR)
unary_operator = OPERATOR_UNARY_OR;
if ((list[i].unary_operator & OPERATOR_UNARY_AND
&& unary_operator == OPERATOR_UNARY_OR) ||
(list[i].unary_operator & OPERATOR_UNARY_OR
&& unary_operator == OPERATOR_UNARY_AND))
return 0;
}
return unary_operator;
}
/* return true if extraction ok
*/
static bool bgp_pbr_extract(struct bgp_pbr_match_val list[],
int num,
struct bgp_pbr_range_port *range)
{
int i = 0;
bool exact_match = false;
if (range)
memset(range, 0, sizeof(struct bgp_pbr_range_port));
if (num > 2)
return false;
for (i = 0; i < num; i++) {
if (i != 0 && (list[i].compare_operator ==
OPERATOR_COMPARE_EQUAL_TO))
return false;
if (i == 0 && (list[i].compare_operator ==
OPERATOR_COMPARE_EQUAL_TO)) {
if (range)
range->min_port = list[i].value;
exact_match = true;
}
if (exact_match && i > 0)
return false;
if (list[i].compare_operator ==
(OPERATOR_COMPARE_GREATER_THAN +
OPERATOR_COMPARE_EQUAL_TO)) {
if (range)
range->min_port = list[i].value;
} else if (list[i].compare_operator ==
(OPERATOR_COMPARE_LESS_THAN +
OPERATOR_COMPARE_EQUAL_TO)) {
if (range)
range->max_port = list[i].value;
} else if (list[i].compare_operator ==
OPERATOR_COMPARE_LESS_THAN) {
if (range)
range->max_port = list[i].value - 1;
} else if (list[i].compare_operator ==
OPERATOR_COMPARE_GREATER_THAN) {
if (range)
range->min_port = list[i].value + 1;
}
}
return true;
}
static int bgp_pbr_validate_policy_route(struct bgp_pbr_entry_main *api)
{
bool enumerate_icmp = false;
if (api->type == BGP_PBR_UNDEFINED) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: pbr entry undefined. cancel.");
return 0;
}
/* because bgp pbr entry may contain unsupported
* combinations, a message will be displayed here if
* not supported.
* for now, only match/set supported is
* - combination src/dst => redirect nexthop [ + rate]
* - combination src/dst => redirect VRF [ + rate]
* - combination src/dst => drop
* - combination srcport + @IP
*/
if (api->match_protocol_num > 1) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match protocol operations:multiple protocols ( %d). ignoring.",
api->match_protocol_num);
return 0;
}
if (api->src_prefix_offset > 0 ||
api->dst_prefix_offset > 0) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match prefix offset:"
"implementation does not support it.");
return 0;
}
if (api->match_protocol_num == 1 &&
api->protocol[0].value != PROTOCOL_UDP &&
api->protocol[0].value != PROTOCOL_ICMP &&
api->protocol[0].value != PROTOCOL_ICMPV6 &&
api->protocol[0].value != PROTOCOL_TCP) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match protocol operations:protocol (%d) not supported. ignoring",
api->match_protocol_num);
return 0;
}
if (!bgp_pbr_extract(api->src_port, api->match_src_port_num, NULL)) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match src port operations:too complex. ignoring.");
return 0;
}
if (!bgp_pbr_extract(api->dst_port, api->match_dst_port_num, NULL)) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match dst port operations:too complex. ignoring.");
return 0;
}
if (!bgp_pbr_extract_enumerate(api->tcpflags,
api->match_tcpflags_num,
OPERATOR_UNARY_AND |
OPERATOR_UNARY_OR, NULL,
FLOWSPEC_TCP_FLAGS)) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match tcp flags:too complex. ignoring.");
return 0;
}
if (!bgp_pbr_extract(api->icmp_type, api->match_icmp_type_num, NULL)) {
if (!bgp_pbr_extract_enumerate(api->icmp_type,
api->match_icmp_type_num,
OPERATOR_UNARY_OR, NULL,
FLOWSPEC_ICMP_TYPE)) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match icmp type operations:too complex. ignoring.");
return 0;
}
enumerate_icmp = true;
}
if (!bgp_pbr_extract(api->icmp_code, api->match_icmp_code_num, NULL)) {
if (!bgp_pbr_extract_enumerate(api->icmp_code,
api->match_icmp_code_num,
OPERATOR_UNARY_OR, NULL,
FLOWSPEC_ICMP_CODE)) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match icmp code operations:too complex. ignoring.");
return 0;
} else if (api->match_icmp_type_num > 1 &&
!enumerate_icmp) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match icmp code is enumerate, and icmp type is not. too complex. ignoring.");
return 0;
}
}
if (!bgp_pbr_extract(api->port, api->match_port_num, NULL)) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match port operations:too complex. ignoring.");
return 0;
}
if (api->match_packet_length_num) {
bool ret;
ret = bgp_pbr_extract(api->packet_length,
api->match_packet_length_num, NULL);
if (!ret)
ret = bgp_pbr_extract_enumerate(api->packet_length,
api->match_packet_length_num,
OPERATOR_UNARY_OR
| OPERATOR_UNARY_AND,
NULL, FLOWSPEC_PKT_LEN);
if (!ret) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match packet length operations:too complex. ignoring.");
return 0;
}
}
if (api->match_dscp_num) {
if (!bgp_pbr_extract_enumerate(api->dscp, api->match_dscp_num,
OPERATOR_UNARY_OR | OPERATOR_UNARY_AND,
NULL, FLOWSPEC_DSCP)) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match DSCP operations:too complex. ignoring.");
return 0;
}
}
if (api->match_flowlabel_num) {
if (api->afi == AFI_IP) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match Flow Label operations:"
"Not for IPv4.");
return 0;
}
if (!bgp_pbr_extract_enumerate(api->flow_label,
api->match_flowlabel_num,
OPERATOR_UNARY_OR | OPERATOR_UNARY_AND,
NULL, FLOWSPEC_FLOW_LABEL)) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match FlowLabel operations:"
"too complex. ignoring.");
return 0;
}
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match FlowLabel operations "
"not supported. ignoring.");
return 0;
}
if (api->match_fragment_num) {
char fail_str[64];
bool success;
success = bgp_pbr_extract_enumerate(api->fragment,
api->match_fragment_num,
OPERATOR_UNARY_OR
| OPERATOR_UNARY_AND,
NULL, FLOWSPEC_FRAGMENT);
if (success) {
int i;
for (i = 0; i < api->match_fragment_num; i++) {
if (api->fragment[i].value != 1 &&
api->fragment[i].value != 2 &&
api->fragment[i].value != 4 &&
api->fragment[i].value != 8) {
success = false;
snprintf(
fail_str, sizeof(fail_str),
"Value not valid (%d) for this implementation",
api->fragment[i].value);
}
if (api->afi == AFI_IP6 &&
api->fragment[i].value == 1) {
success = false;
snprintf(fail_str, sizeof(fail_str),
"IPv6 dont fragment match invalid (%d)",
api->fragment[i].value);
}
}
if (api->afi == AFI_IP6) {
success = false;
snprintf(fail_str, sizeof(fail_str),
"%s", IPV6_FRAGMENT_INVALID);
}
} else
snprintf(fail_str, sizeof(fail_str),
"too complex. ignoring");
if (!success) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match fragment operation (%d) %s",
api->match_fragment_num,
fail_str);
return 0;
}
}
/* no combinations with both src_port and dst_port
* or port with src_port and dst_port
*/
if (api->match_src_port_num + api->match_dst_port_num +
api->match_port_num > 3) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match multiple port operations: too complex. ignoring.");
return 0;
}
if ((api->match_src_port_num || api->match_dst_port_num
|| api->match_port_num) && (api->match_icmp_type_num
|| api->match_icmp_code_num)) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match multiple port/imcp operations: too complex. ignoring.");
return 0;
}
/* iprule only supports redirect IP */
if (api->type == BGP_PBR_IPRULE) {
int i;
for (i = 0; i < api->action_num; i++) {
if (api->actions[i].action == ACTION_TRAFFICRATE &&
api->actions[i].u.r.rate == 0) {
if (BGP_DEBUG(pbr, PBR)) {
bgp_pbr_print_policy_route(api);
zlog_debug("BGP: iprule match actions drop not supported");
}
return 0;
}
if (api->actions[i].action == ACTION_MARKING) {
if (BGP_DEBUG(pbr, PBR)) {
bgp_pbr_print_policy_route(api);
zlog_warn("PBR: iprule set DSCP/Flow Label %u not supported",
api->actions[i].u.marking_dscp);
}
}
if (api->actions[i].action == ACTION_REDIRECT) {
if (BGP_DEBUG(pbr, PBR)) {
bgp_pbr_print_policy_route(api);
zlog_warn("PBR: iprule redirect VRF %u not supported",
api->actions[i].u.redirect_vrf);
}
}
}
} else if (!(api->match_bitmask & PREFIX_SRC_PRESENT) &&
!(api->match_bitmask & PREFIX_DST_PRESENT)) {
if (BGP_DEBUG(pbr, PBR)) {
bgp_pbr_print_policy_route(api);
zlog_debug("BGP: match actions without src or dst address can not operate. ignoring.");
}
return 0;
}
return 1;
}
/* return -1 if build or validation failed */
int bgp_pbr_build_and_validate_entry(const struct prefix *p,
struct bgp_path_info *path,
struct bgp_pbr_entry_main *api)
{
int ret;
uint32_t i, action_count = 0;
struct ecommunity *ecom;
struct ecommunity_val *ecom_eval;
struct bgp_pbr_entry_action *api_action;
struct prefix *src = NULL, *dst = NULL;
int valid_prefix = 0;
struct bgp_pbr_entry_action *api_action_redirect_ip = NULL;
bool discard_action_found = false;
afi_t afi = family2afi(p->u.prefix_flowspec.family);
/* extract match from flowspec entries */
ret = bgp_flowspec_match_rules_fill((uint8_t *)p->u.prefix_flowspec.ptr,
p->u.prefix_flowspec.prefixlen, api, afi);
if (ret < 0)
return -1;
/* extract actiosn from flowspec ecom list */
if (path && bgp_attr_get_ecommunity(path->attr)) {
ecom = bgp_attr_get_ecommunity(path->attr);
for (i = 0; i < ecom->size; i++) {
ecom_eval = (struct ecommunity_val *)
(ecom->val + (i * ECOMMUNITY_SIZE));
action_count++;
if (action_count > ACTIONS_MAX_NUM) {
if (BGP_DEBUG(pbr, PBR_ERROR))
flog_err(
EC_BGP_FLOWSPEC_PACKET,
"%s: %s (max %u)",
__func__,
FSPEC_ACTION_EXCEED_LIMIT,
action_count);
break;
}
api_action = &api->actions[action_count - 1];
if ((ecom_eval->val[1] ==
(char)ECOMMUNITY_REDIRECT_VRF) &&
(ecom_eval->val[0] ==
(char)ECOMMUNITY_ENCODE_TRANS_EXP ||
ecom_eval->val[0] ==
(char)ECOMMUNITY_EXTENDED_COMMUNITY_PART_2 ||
ecom_eval->val[0] ==
(char)ECOMMUNITY_EXTENDED_COMMUNITY_PART_3)) {
struct ecommunity *eckey = ecommunity_new();
struct ecommunity_val ecom_copy;
memcpy(&ecom_copy, ecom_eval,
sizeof(struct ecommunity_val));
ecom_copy.val[0] &=
~ECOMMUNITY_ENCODE_TRANS_EXP;
ecom_copy.val[1] = ECOMMUNITY_ROUTE_TARGET;
ecommunity_add_val(eckey, &ecom_copy,
false, false);
api_action->action = ACTION_REDIRECT;
api_action->u.redirect_vrf =
get_first_vrf_for_redirect_with_rt(
eckey);
ecommunity_free(&eckey);
} else if ((ecom_eval->val[0] ==
(char)ECOMMUNITY_ENCODE_REDIRECT_IP_NH) &&
(ecom_eval->val[1] ==
(char)ECOMMUNITY_REDIRECT_IP_NH)) {
/* in case the 2 ecom present,
* do not overwrite
* draft-ietf-idr-flowspec-redirect
*/
if (api_action_redirect_ip &&
p->u.prefix_flowspec.family == AF_INET) {
if (api_action_redirect_ip->u
.zr.redirect_ip_v4.s_addr
!= INADDR_ANY)
continue;
if (path->attr->nexthop.s_addr
== INADDR_ANY)
continue;
api_action_redirect_ip->u.zr
.redirect_ip_v4.s_addr =
path->attr->nexthop.s_addr;
api_action_redirect_ip->u.zr.duplicate
= ecom_eval->val[7];
continue;
} else if (api_action_redirect_ip &&
p->u.prefix_flowspec.family == AF_INET6) {
if (memcmp(&api_action_redirect_ip->u
.zr.redirect_ip_v6,
&in6addr_any,
sizeof(struct in6_addr)))
continue;
if (path->attr->mp_nexthop_len == 0 ||
path->attr->mp_nexthop_len ==
BGP_ATTR_NHLEN_IPV4 ||
path->attr->mp_nexthop_len ==
BGP_ATTR_NHLEN_VPNV4)
continue;
memcpy(&api_action_redirect_ip->u
.zr.redirect_ip_v6,
&path->attr->mp_nexthop_global,
sizeof(struct in6_addr));
api_action_redirect_ip->u.zr.duplicate
= ecom_eval->val[7];
continue;
} else if (p->u.prefix_flowspec.family ==
AF_INET) {
api_action->action = ACTION_REDIRECT_IP;
api_action->u.zr.redirect_ip_v4.s_addr =
path->attr->nexthop.s_addr;
api_action->u.zr.duplicate =
ecom_eval->val[7];
api_action_redirect_ip = api_action;
} else if (p->u.prefix_flowspec.family ==
AF_INET6) {
api_action->action = ACTION_REDIRECT_IP;
memcpy(&api_action->u
.zr.redirect_ip_v6,
&path->attr->mp_nexthop_global,
sizeof(struct in6_addr));
api_action->u.zr.duplicate
= ecom_eval->val[7];
api_action_redirect_ip = api_action;
}
} else if ((ecom_eval->val[0] ==
(char)ECOMMUNITY_ENCODE_IP) &&
(ecom_eval->val[1] ==
(char)ECOMMUNITY_FLOWSPEC_REDIRECT_IPV4)) {
/* in case the 2 ecom present,
* overwrite simpson draft
* update redirect ip fields
*/
if (api_action_redirect_ip) {
memcpy(&(api_action_redirect_ip->u
.zr.redirect_ip_v4.s_addr),
(ecom_eval->val+2), 4);
api_action_redirect_ip->u
.zr.duplicate =
ecom_eval->val[7];
continue;
} else {
api_action->action = ACTION_REDIRECT_IP;
memcpy(&(api_action->u
.zr.redirect_ip_v4.s_addr),
(ecom_eval->val+2), 4);
api_action->u.zr.duplicate =
ecom_eval->val[7];
api_action_redirect_ip = api_action;
}
} else {
if (ecom_eval->val[0] !=
(char)ECOMMUNITY_ENCODE_TRANS_EXP)
continue;
ret = ecommunity_fill_pbr_action(ecom_eval,
api_action,
afi);
if (ret != 0)
continue;
if ((api_action->action == ACTION_TRAFFICRATE)
&& api->actions[i].u.r.rate == 0)
discard_action_found = true;
}
api->action_num++;
}
}
if (path && path->attr && bgp_attr_get_ipv6_ecommunity(path->attr)) {
struct ecommunity_val_ipv6 *ipv6_ecom_eval;
ecom = bgp_attr_get_ipv6_ecommunity(path->attr);
for (i = 0; i < ecom->size; i++) {
ipv6_ecom_eval = (struct ecommunity_val_ipv6 *)
(ecom->val + (i * ecom->unit_size));
action_count++;
if (action_count > ACTIONS_MAX_NUM) {
if (BGP_DEBUG(pbr, PBR_ERROR))
flog_err(
EC_BGP_FLOWSPEC_PACKET,
"%s: flowspec actions exceeds limit (max %u)",
__func__, action_count);
break;
}
api_action = &api->actions[action_count - 1];
if ((ipv6_ecom_eval->val[1] ==
(char)ECOMMUNITY_FLOWSPEC_REDIRECT_IPV6) &&
(ipv6_ecom_eval->val[0] ==
(char)ECOMMUNITY_ENCODE_TRANS_EXP)) {
struct ecommunity *eckey = ecommunity_new();
struct ecommunity_val_ipv6 ecom_copy;
eckey->unit_size = IPV6_ECOMMUNITY_SIZE;
memcpy(&ecom_copy, ipv6_ecom_eval,
sizeof(struct ecommunity_val_ipv6));
ecom_copy.val[1] = ECOMMUNITY_ROUTE_TARGET;
ecommunity_add_val_ipv6(eckey, &ecom_copy,
false, false);
api_action->action = ACTION_REDIRECT;
api_action->u.redirect_vrf =
get_first_vrf_for_redirect_with_rt(
eckey);
ecommunity_free(&eckey);
api->action_num++;
}
}
}
/* if ECOMMUNITY_TRAFFIC_RATE = 0 as action
* then reduce the API action list to that action
*/
if (api->action_num > 1 && discard_action_found) {
api->action_num = 1;
memset(&api->actions[0], 0,
sizeof(struct bgp_pbr_entry_action));
api->actions[0].action = ACTION_TRAFFICRATE;
}
/* validate if incoming matc/action is compatible
* with our policy routing engine
*/
if (!bgp_pbr_validate_policy_route(api))
return -1;
/* check inconsistency in the match rule */
if (api->match_bitmask & PREFIX_SRC_PRESENT) {
src = &api->src_prefix;
afi = family2afi(src->family);
valid_prefix = 1;
}
if (api->match_bitmask & PREFIX_DST_PRESENT) {
dst = &api->dst_prefix;
if (valid_prefix && afi != family2afi(dst->family)) {
if (BGP_DEBUG(pbr, PBR)) {
bgp_pbr_print_policy_route(api);
zlog_debug("%s: inconsistency: no match for afi src and dst (%u/%u)",
__func__, afi, family2afi(dst->family));
}
return -1;
}
}
return 0;
}
static void bgp_pbr_match_entry_free(void *arg)
{
struct bgp_pbr_match_entry *bpme;
bpme = (struct bgp_pbr_match_entry *)arg;
if (bpme->installed) {
bgp_send_pbr_ipset_entry_match(bpme, false);
bpme->installed = false;
bpme->backpointer = NULL;
}
XFREE(MTYPE_PBR_MATCH_ENTRY, bpme);
}
static void bgp_pbr_match_free(void *arg)
{
struct bgp_pbr_match *bpm;
bpm = (struct bgp_pbr_match *)arg;
hash_clean(bpm->entry_hash, bgp_pbr_match_entry_free);