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or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /** * @brief bier_fmask : The BIER fmask * * The BIER fmask contains the bitString that is applied to packets that * egress towards the next-hop. As such the fmask is part of the rewrite * (adj) for that next-hop. It it thus an extension of the next-hop and in * no way associated with the bit-position(s) that are reachable through it. * Fmasks are thus shared by bit-positions that egress throught the same * nh (BFR-NBR). * Deag fmasks are also shread in the event that a router has local * bit-positions. This is necessary to prevent the router recieving two copies * of each packet. Consequently it also means that they share the same * disposition data for the global data. */ #ifndef __BIER_FMASK_H__ #define __BIER_FMASK_H__ #include <vlib/vlib.h> #include <vnet/fib/fib_node.h> #include <vnet/mpls/packet.h> #include <vnet/dpo/dpo.h> #include <vnet/bier/bier_types.h> #include <vnet/bier/bier_fmask_db.h> /** * A struct that represents the reference counting of the bits */ typedef struct bier_fmask_bits_t_ { /** * each bit in the mask needs to be reference counted * and set/cleared on the 0->1 and 1->0 transitions. */ bier_bit_string_t bfmb_input_reset_string; u32 *bfmb_refs; /** * The total number of references to bits set on this mask * in effect a count of the number of children. */ u32 bfmb_count; } bier_fmask_bits_t; /** * Flags on fmask */ typedef enum bier_fmask_attributes_t_ { BIER_FMASK_ATTR_FIRST, BIER_FMASK_ATTR_FORWARDING = BIER_FMASK_ATTR_FIRST, BIER_FMASK_ATTR_DISP, BIER_FMASK_ATTR_MPLS, BIER_FMASK_ATTR_LAST = BIER_FMASK_ATTR_DISP, } bier_fmask_attributes_t; #define BIER_FMASK_ATTR_NAMES { \ [BIER_FMASK_ATTR_FORWARDING] = "forwarding", \ [BIER_FMASK_ATTR_DISP] = "disposition", \ [BIER_FMASK_ATTR_MPLS] = "mpls", \ } #define FOR_EACH_BIER_FMASK_ATTR(_item) \ for (_item = BIER_FMASK_ATTR_FIRST; \ _item <= BIER_FMASK_ATTR_LAST; \ _item++) typedef enum bier_fmask_flags_t_ { BIER_FMASK_FLAG_FORWARDING = (1 << BIER_FMASK_ATTR_FORWARDING), BIER_FMASK_FLAG_DISP = (1 << BIER_FMASK_ATTR_DISP), BIER_FMASK_FLAG_MPLS = (1 << BIER_FMASK_ATTR_MPLS), } bier_fmask_flags_t; /** * An outgoing BIER mask. aka forwarding bit mask (in the RFCs) * * This mask's function is two-fold * 1 - it is logical-AND with the input packet header to produce the * output packet header * 2 - it is logical NAND with the input packet header to modify the bit-mask * for the next lookup */ typedef struct bier_fmask_t_ { /** * The BIER fmask is a child of a FIB entry in the FIB graph. */ fib_node_t bfm_node; /** * operational/state flags on the fmask */ bier_fmask_flags_t bfm_flags; /** * The bits, and their ref counts, that are set on this mask * This mask changes as BIER entries link to and from this fmask */ bier_fmask_bits_t bfm_bits; /** * The key to this fmask - used for store/lookup in the DB */ bier_fmask_id_t *bfm_id; /** * The MPLS label to paint on the header during forwarding */ mpls_label_t bfm_label; /** * The path-list */ fib_node_index_t bfm_pl; /** * the index of this fmask in the parent's child list. */ u32 bfm_sibling; /** * The index into the adj table for the adj that * this fmask resolves via */ dpo_id_t bfm_dpo; } bier_fmask_t; extern void bier_fmask_link(index_t bfmi, bier_bp_t bp); extern void bier_fmask_unlink(index_t bfmi, bier_bp_t bp); extern void bier_fmask_unlock(index_t bfmi); extern void bier_fmask_lock(index_t bfmi); extern index_t bier_fmask_create_and_lock(const bier_fmask_id_t *fmid, const fib_route_path_t *rpath); extern u8* format_bier_fmask(u8 *s, va_list *ap); extern void bier_fmask_contribute_forwarding(index_t bfmi, dpo_id_t *dpo); extern u32 bier_fmask_child_add (fib_node_index_t fib_entry_index, fib_node_type_t child_type, fib_node_index_t child_index); extern void bier_fmask_child_remove (fib_node_index_t fib_entry_index, u32 sibling_index); /* * provided for fast data-path access */ bier_fmask_t *bier_fmask_pool; static inline bier_fmask_t * bier_fmask_get (u32 index) { return (pool_elt_at_index(bier_fmask_pool, index)); } #endif