#include "bgpd/bgpd.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_flowspec.h"
+#include "bgpd/bgp_flowspec_util.h"
#include "bgpd/bgp_flowspec_private.h"
+static int bgp_fs_nlri_validate(uint8_t *nlri_content, uint32_t len)
+{
+ uint32_t offset = 0;
+ int type;
+ int ret = 0, error = 0;
+
+ while (offset < len-1) {
+ type = nlri_content[offset];
+ offset++;
+ switch (type) {
+ case FLOWSPEC_DEST_PREFIX:
+ case FLOWSPEC_SRC_PREFIX:
+ ret = bgp_flowspec_ip_address(
+ BGP_FLOWSPEC_VALIDATE_ONLY,
+ nlri_content + offset,
+ len - offset, NULL, &error);
+ 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_TCP_FLAGS:
+ ret = bgp_flowspec_tcpflags_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;
+ case FLOWSPEC_FRAGMENT:
+ ret = bgp_flowspec_fragment_type_decode(
+ BGP_FLOWSPEC_VALIDATE_ONLY,
+ nlri_content + offset,
+ len - offset, NULL, &error);
+ break;
+ default:
+ error = -1;
+ break;
+ }
+ offset += ret;
+ if (error < 0)
+ break;
+ }
+ return error;
+}
+
int bgp_nlri_parse_flowspec(struct peer *peer, struct attr *attr,
struct bgp_nlri *packet, int withdraw)
{
uint8_t *pnt;
uint8_t *lim;
afi_t afi;
+ safi_t safi;
int psize = 0;
uint8_t rlen;
struct prefix p;
+ int ret;
+ void *temp;
/* Start processing the NLRI - there may be multiple in the MP_REACH */
pnt = packet->nlri;
lim = pnt + packet->length;
afi = packet->afi;
+ safi = packet->safi;
if (afi == AFI_IP6) {
zlog_err("BGP flowspec IPv6 not supported");
psize);
return -1;
}
- /* TODO: validate prefix
- * and add to FIB
- */
+ if (bgp_fs_nlri_validate(pnt, psize) < 0) {
+ zlog_err("Bad flowspec format or NLRI options not supported");
+ return -1;
+ }
+ p.family = AF_FLOWSPEC;
+ p.prefixlen = 0;
+ /* Flowspec encoding is in bytes */
+ p.u.prefix_flowspec.prefixlen = psize;
+ temp = XCALLOC(MTYPE_TMP, psize);
+ memcpy(temp, pnt, psize);
+ p.u.prefix_flowspec.ptr = (uintptr_t) temp;
+ /* Process the route. */
+ if (!withdraw)
+ ret = bgp_update(peer, &p, 0, attr,
+ afi, safi,
+ ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
+ NULL, NULL, 0, 0, NULL);
+ else
+ ret = bgp_withdraw(peer, &p, 0, attr,
+ afi, safi,
+ ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
+ NULL, NULL, 0, NULL);
+ if (ret) {
+ zlog_err("Flowspec NLRI failed to be %s.",
+ attr ? "added" : "withdrawn");
+ return -1;
+ }
}
return 0;
}