#include "zebra.h"
#include "prefix.h"
+#include "lib_errors.h"
#include "bgp_table.h"
#include "bgp_flowspec_util.h"
#include "bgp_flowspec_private.h"
+#include "bgp_pbr.h"
+#include "bgp_errors.h"
static void hex2bin(uint8_t *hex, int *bin)
{
return num;
}
+/* call bgp_flowspec_op_decode
+ * returns offset
+ */
+static int bgp_flowspec_call_non_opaque_decode(uint8_t *nlri_content, int len,
+ struct bgp_pbr_match_val *mval,
+ uint8_t *match_num, int *error)
+{
+ int ret;
+
+ ret = bgp_flowspec_op_decode(
+ BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE,
+ nlri_content,
+ len,
+ mval, error);
+ if (*error < 0)
+ flog_err(EC_BGP_FLOWSPEC_PACKET,
+ "%s: flowspec_op_decode error %d", __func__, *error);
+ else
+ *match_num = *error;
+ return ret;
+}
+
+bool bgp_flowspec_contains_prefix(struct prefix *pfs,
+ struct prefix *input,
+ int prefix_check)
+{
+ uint32_t offset = 0;
+ int type;
+ int ret = 0, error = 0;
+ uint8_t *nlri_content = (uint8_t *)pfs->u.prefix_flowspec.ptr;
+ size_t len = pfs->u.prefix_flowspec.prefixlen;
+ struct prefix compare;
+
+ error = 0;
+ while (offset < len-1 && error >= 0) {
+ type = nlri_content[offset];
+ offset++;
+ switch (type) {
+ case FLOWSPEC_DEST_PREFIX:
+ case FLOWSPEC_SRC_PREFIX:
+ memset(&compare, 0, sizeof(struct prefix));
+ ret = bgp_flowspec_ip_address(
+ BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE,
+ nlri_content+offset,
+ len - offset,
+ &compare, &error);
+ if (ret <= 0)
+ break;
+ if (prefix_check &&
+ compare.prefixlen != input->prefixlen)
+ break;
+ if (compare.family != input->family)
+ break;
+ if ((input->family == AF_INET) &&
+ IPV4_ADDR_SAME(&input->u.prefix4,
+ &compare.u.prefix4))
+ return true;
+ if ((input->family == AF_INET6) &&
+ IPV6_ADDR_SAME(&input->u.prefix6.s6_addr,
+ &compare.u.prefix6.s6_addr))
+ return true;
+ break;
+ case FLOWSPEC_IP_PROTOCOL:
+ case FLOWSPEC_PORT:
+ case FLOWSPEC_DEST_PORT:
+ case FLOWSPEC_SRC_PORT:
+ case FLOWSPEC_ICMP_TYPE:
+ case FLOWSPEC_ICMP_CODE:
+ ret = bgp_flowspec_op_decode(BGP_FLOWSPEC_VALIDATE_ONLY,
+ nlri_content+offset,
+ len - offset,
+ NULL, &error);
+ break;
+ case FLOWSPEC_FRAGMENT:
+ case FLOWSPEC_TCP_FLAGS:
+ ret = bgp_flowspec_bitmask_decode(
+ BGP_FLOWSPEC_VALIDATE_ONLY,
+ nlri_content+offset,
+ len - offset,
+ NULL, &error);
+ break;
+ case FLOWSPEC_PKT_LEN:
+ case FLOWSPEC_DSCP:
+ ret = bgp_flowspec_op_decode(
+ BGP_FLOWSPEC_VALIDATE_ONLY,
+ nlri_content + offset,
+ len - offset, NULL,
+ &error);
+ break;
+ default:
+ error = -1;
+ break;
+ }
+ offset += ret;
+ }
+ return false;
+}
/*
* handle the flowspec address src/dst or generic address NLRI
uint32_t offset = 0;
int len_string = BGP_FLOWSPEC_STRING_DISPLAY_MAX;
int len_written;
+ struct bgp_pbr_match_val *mval = (struct bgp_pbr_match_val *)result;
*error = 0;
do {
+ if (loop > BGP_PBR_MATCH_VAL_MAX)
+ *error = -2;
hex2bin(&nlri_ptr[offset], op);
offset++;
len = 2*op[2]+op[3];
ptr += len_written;
break;
case BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE:
- /* TODO : FS OPAQUE */
+ /* limitation: stop converting */
+ if (*error == -2)
+ break;
+ mval->value = value;
+ if (op[5] == 1)
+ mval->compare_operator |=
+ OPERATOR_COMPARE_LESS_THAN;
+ if (op[6] == 1)
+ mval->compare_operator |=
+ OPERATOR_COMPARE_GREATER_THAN;
+ if (op[7] == 1)
+ mval->compare_operator |=
+ OPERATOR_COMPARE_EQUAL_TO;
+ if (op[1] == 1)
+ mval->unary_operator = OPERATOR_UNARY_AND;
+ else
+ mval->unary_operator = OPERATOR_UNARY_OR;
+ mval++;
break;
case BGP_FLOWSPEC_VALIDATE_ONLY:
default:
/*
- * handle the flowspec tcpflags field
+ * handle the flowspec tcpflags or fragment field
* return number of bytes analysed
* if there is an error, the passed error param is used to give error:
* -1 if decoding error,
* if result is a string, its assumed length
* is BGP_FLOWSPEC_STRING_DISPLAY_MAX
*/
-int bgp_flowspec_tcpflags_decode(enum bgp_flowspec_util_nlri_t type,
+int bgp_flowspec_bitmask_decode(enum bgp_flowspec_util_nlri_t type,
uint8_t *nlri_ptr,
uint32_t max_len,
void *result, int *error)
int op[8];
int len, value_size, loop = 0, value;
char *ptr = (char *)result; /* for return_string */
+ struct bgp_pbr_match_val *mval = (struct bgp_pbr_match_val *)result;
uint32_t offset = 0;
int len_string = BGP_FLOWSPEC_STRING_DISPLAY_MAX;
int len_written;
*error = 0;
do {
+ if (loop > BGP_PBR_MATCH_VAL_MAX)
+ *error = -2;
hex2bin(&nlri_ptr[offset], op);
/* if first element, AND bit can not be set */
if (op[1] == 1 && loop == 0)
case BGP_FLOWSPEC_RETURN_STRING:
if (op[1] == 1 && loop != 0) {
len_written = snprintf(ptr, len_string,
- ", and ");
+ ",&");
len_string -= len_written;
ptr += len_written;
} else if (op[1] == 0 && loop != 0) {
len_written = snprintf(ptr, len_string,
- ", or ");
+ ",|");
len_string -= len_written;
ptr += len_written;
}
- len_written = snprintf(ptr, len_string,
- "tcp flags is ");
- len_string -= len_written;
- ptr += len_written;
- if (op[6] == 1) {
- ptr += snprintf(ptr, len_string,
- "not ");
+ if (op[7] == 1) {
+ len_written = snprintf(ptr, len_string,
+ "= ");
+ len_string -= len_written;
+ ptr += len_written;
+ } else {
+ len_written = snprintf(ptr, len_string,
+ "∋ ");
len_string -= len_written;
ptr += len_written;
}
- if (op[7] == 1) {
- ptr += snprintf(ptr, len_string,
- "exactly match ");
+ if (op[6] == 1) {
+ len_written = snprintf(ptr, len_string,
+ "! ");
len_string -= len_written;
ptr += len_written;
}
- ptr += snprintf(ptr, len_string,
+ len_written = snprintf(ptr, len_string,
"%d", value);
len_string -= len_written;
ptr += len_written;
break;
case BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE:
- /* TODO : FS OPAQUE */
+ /* limitation: stop converting */
+ if (*error == -2)
+ break;
+ mval->value = value;
+ if (op[6] == 1) {
+ /* different from */
+ mval->compare_operator |=
+ OPERATOR_COMPARE_LESS_THAN;
+ mval->compare_operator |=
+ OPERATOR_COMPARE_GREATER_THAN;
+ } else
+ mval->compare_operator |=
+ OPERATOR_COMPARE_EQUAL_TO;
+ if (op[7] == 1)
+ mval->compare_operator |=
+ OPERATOR_COMPARE_EXACT_MATCH;
+ if (op[1] == 1)
+ mval->unary_operator =
+ OPERATOR_UNARY_AND;
+ else
+ mval->unary_operator =
+ OPERATOR_UNARY_OR;
+ mval++;
break;
case BGP_FLOWSPEC_VALIDATE_ONLY:
default:
return offset;
}
-/*
- * handle the flowspec fragment type field
- * return error (returned values are invalid) or number of bytes analysed
- * -1 if error in decoding
- * >= 0 : number of bytes analysed (ok).
- */
-int bgp_flowspec_fragment_type_decode(enum bgp_flowspec_util_nlri_t type,
- uint8_t *nlri_ptr,
- uint32_t max_len,
- void *result, int *error)
-{
- int op[8];
- int len, value, value_size, loop = 0;
- char *ptr = (char *)result; /* for return_string */
- uint32_t offset = 0;
- int len_string = BGP_FLOWSPEC_STRING_DISPLAY_MAX;
- int len_written;
-
- *error = 0;
- do {
- hex2bin(&nlri_ptr[offset], op);
- offset++;
- len = 2 * op[2] + op[3];
- value_size = 1 << len;
- value = hexstr2num(&nlri_ptr[offset], value_size);
- if (value != 1 && value != 2 && value != 4 && value != 8)
- *error = -1;
- offset += value_size;
- /* TODO : as per RFC5574 : first Fragment bits are Reserved
- * does that mean that it is not possible
- * to handle multiple occurences ?
- * as of today, we only grab the first TCP fragment
- */
- if (loop) {
- *error = -2;
- loop++;
- continue;
- }
- switch (type) {
- case BGP_FLOWSPEC_RETURN_STRING:
- switch (value) {
- case 1:
- len_written = snprintf(ptr, len_string,
- "dont-fragment");
- len_string -= len_written;
- ptr += len_written;
- break;
- case 2:
- len_written = snprintf(ptr, len_string,
- "is-fragment");
- len_string -= len_written;
- ptr += len_written;
- break;
- case 4:
- len_written = snprintf(ptr, len_string,
- "first-fragment");
- len_string -= len_written;
- ptr += len_written;
- break;
- case 8:
- len_written = snprintf(ptr, len_string,
- "last-fragment");
- len_string -= len_written;
- ptr += len_written;
- break;
- default:
- {}
- }
- break;
- case BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE:
- /* TODO : FS OPAQUE */
- break;
- case BGP_FLOWSPEC_VALIDATE_ONLY:
- default:
- /* no action */
- break;
- }
- loop++;
- } while (op[0] == 0 && offset < max_len - 1);
- if (offset > max_len)
- *error = -1;
- return offset;
-}
-
-
-static bool bgp_flowspec_contains_prefix(struct prefix *pfs,
- struct prefix *input,
- int prefix_check)
+int bgp_flowspec_match_rules_fill(uint8_t *nlri_content, int len,
+ struct bgp_pbr_entry_main *bpem)
{
- uint32_t offset = 0;
- int type;
- int ret = 0, error = 0;
- uint8_t *nlri_content = (uint8_t *)pfs->u.prefix_flowspec.ptr;
- size_t len = pfs->u.prefix_flowspec.prefixlen;
- struct prefix compare;
+ int offset = 0, error = 0;
+ struct prefix *prefix;
+ struct bgp_pbr_match_val *mval;
+ uint8_t *match_num;
+ uint8_t bitmask = 0;
+ int ret = 0, type;
- error = 0;
- while (offset < len-1 && error >= 0) {
+ while (offset < len - 1 && error >= 0) {
type = nlri_content[offset];
offset++;
switch (type) {
case FLOWSPEC_DEST_PREFIX:
case FLOWSPEC_SRC_PREFIX:
- memset(&compare, 0, sizeof(struct prefix));
+ bitmask = 0;
+ if (type == FLOWSPEC_DEST_PREFIX) {
+ bitmask |= PREFIX_DST_PRESENT;
+ prefix = &bpem->dst_prefix;
+ } else {
+ bitmask |= PREFIX_SRC_PRESENT;
+ prefix = &bpem->src_prefix;
+ }
ret = bgp_flowspec_ip_address(
BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE,
- nlri_content+offset,
+ nlri_content + offset,
len - offset,
- &compare, &error);
- if (ret <= 0)
- break;
- if (prefix_check &&
- compare.prefixlen != input->prefixlen)
- break;
- if (compare.family != input->family)
- break;
- if ((input->family == AF_INET) &&
- IPV4_ADDR_SAME(&input->u.prefix4,
- &compare.u.prefix4))
- return true;
- if ((input->family == AF_INET6) &&
- IPV6_ADDR_SAME(&input->u.prefix6.s6_addr,
- &compare.u.prefix6.s6_addr))
- return true;
+ prefix, &error);
+ if (error < 0)
+ flog_err(EC_BGP_FLOWSPEC_PACKET,
+ "%s: flowspec_ip_address error %d",
+ __func__, error);
+ else {
+ /* if src or dst address is 0.0.0.0,
+ * ignore that rule
+ */
+ if (prefix->family == AF_INET
+ && prefix->u.prefix4.s_addr == 0)
+ memset(prefix, 0,
+ sizeof(struct prefix));
+ else
+ bpem->match_bitmask |= bitmask;
+ }
+ offset += ret;
break;
case FLOWSPEC_IP_PROTOCOL:
+ match_num = &(bpem->match_protocol_num);
+ mval = (struct bgp_pbr_match_val *)
+ &(bpem->protocol);
+ offset += bgp_flowspec_call_non_opaque_decode(
+ nlri_content + offset,
+ len - offset,
+ mval, match_num,
+ &error);
+ break;
case FLOWSPEC_PORT:
+ match_num = &(bpem->match_port_num);
+ mval = (struct bgp_pbr_match_val *)
+ &(bpem->port);
+ offset += bgp_flowspec_call_non_opaque_decode(
+ nlri_content + offset,
+ len - offset,
+ mval, match_num,
+ &error);
+ break;
case FLOWSPEC_DEST_PORT:
+ match_num = &(bpem->match_dst_port_num);
+ mval = (struct bgp_pbr_match_val *)
+ &(bpem->dst_port);
+ offset += bgp_flowspec_call_non_opaque_decode(
+ nlri_content + offset,
+ len - offset,
+ mval, match_num,
+ &error);
+ break;
case FLOWSPEC_SRC_PORT:
+ match_num = &(bpem->match_src_port_num);
+ mval = (struct bgp_pbr_match_val *)
+ &(bpem->src_port);
+ offset += bgp_flowspec_call_non_opaque_decode(
+ nlri_content + offset,
+ len - offset,
+ mval, match_num,
+ &error);
+ break;
case FLOWSPEC_ICMP_TYPE:
- case FLOWSPEC_ICMP_CODE:
- ret = bgp_flowspec_op_decode(BGP_FLOWSPEC_VALIDATE_ONLY,
- nlri_content+offset,
- len - offset,
- NULL, &error);
+ match_num = &(bpem->match_icmp_type_num);
+ mval = (struct bgp_pbr_match_val *)
+ &(bpem->icmp_type);
+ offset += bgp_flowspec_call_non_opaque_decode(
+ nlri_content + offset,
+ len - offset,
+ mval, match_num,
+ &error);
break;
- case FLOWSPEC_TCP_FLAGS:
- ret = bgp_flowspec_tcpflags_decode(
- BGP_FLOWSPEC_VALIDATE_ONLY,
- nlri_content+offset,
- len - offset,
- NULL, &error);
+ case FLOWSPEC_ICMP_CODE:
+ match_num = &(bpem->match_icmp_code_num);
+ mval = (struct bgp_pbr_match_val *)
+ &(bpem->icmp_code);
+ offset += bgp_flowspec_call_non_opaque_decode(
+ nlri_content + offset,
+ len - offset,
+ mval, match_num,
+ &error);
break;
case FLOWSPEC_PKT_LEN:
+ match_num =
+ &(bpem->match_packet_length_num);
+ mval = (struct bgp_pbr_match_val *)
+ &(bpem->packet_length);
+ offset += bgp_flowspec_call_non_opaque_decode(
+ nlri_content + offset,
+ len - offset,
+ mval, match_num,
+ &error);
+ break;
case FLOWSPEC_DSCP:
- ret = bgp_flowspec_op_decode(
- BGP_FLOWSPEC_VALIDATE_ONLY,
- nlri_content + offset,
- len - offset, NULL,
- &error);
+ match_num = &(bpem->match_dscp_num);
+ mval = (struct bgp_pbr_match_val *)
+ &(bpem->dscp);
+ offset += bgp_flowspec_call_non_opaque_decode(
+ nlri_content + offset,
+ len - offset,
+ mval, match_num,
+ &error);
+ break;
+ case FLOWSPEC_TCP_FLAGS:
+ ret = bgp_flowspec_bitmask_decode(
+ BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE,
+ nlri_content + offset,
+ len - offset,
+ &bpem->tcpflags, &error);
+ if (error < 0)
+ flog_err(
+ EC_BGP_FLOWSPEC_PACKET,
+ "%s: flowspec_tcpflags_decode error %d",
+ __func__, error);
+ else
+ bpem->match_tcpflags_num = error;
+ /* contains the number of slots used */
+ offset += ret;
break;
case FLOWSPEC_FRAGMENT:
- ret = bgp_flowspec_fragment_type_decode(
- BGP_FLOWSPEC_VALIDATE_ONLY,
- nlri_content + offset,
- len - offset, NULL,
- &error);
+ ret = bgp_flowspec_bitmask_decode(
+ BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE,
+ nlri_content + offset,
+ len - offset, &bpem->fragment,
+ &error);
+ if (error < 0)
+ flog_err(
+ EC_BGP_FLOWSPEC_PACKET,
+ "%s: flowspec_fragment_type_decode error %d",
+ __func__, error);
+ else
+ bpem->match_fragment_num = error;
+ offset += ret;
break;
default:
- error = -1;
- break;
+ flog_err(EC_LIB_DEVELOPMENT, "%s: unknown type %d\n",
+ __func__, type);
}
- offset += ret;
- }
- return false;
-}
-
-struct bgp_node *bgp_flowspec_get_match_per_ip(afi_t afi,
- struct bgp_table *rib,
- struct prefix *match,
- int prefix_check)
-{
- struct bgp_node *rn;
- struct prefix *prefix;
-
- for (rn = bgp_table_top(rib); rn; rn = bgp_route_next(rn)) {
- prefix = &rn->p;
-
- if (prefix->family != AF_FLOWSPEC)
- continue;
-
- if (bgp_flowspec_contains_prefix(prefix, match, prefix_check))
- return rn;
}
- return NULL;
+ return error;
}
projects / mirror_frr.git / blobdiff