diff --git a/lib/nexthop.c b/lib/nexthop.c index b1e9582b20..3603050f06 100644 --- a/lib/nexthop.c +++ b/lib/nexthop.c @@ -31,6 +31,7 @@ #include "prefix.h" #include "nexthop.h" #include "mpls.h" +#include "jhash.h" DEFINE_MTYPE_STATIC(LIB, NEXTHOP, "Nexthop") DEFINE_MTYPE_STATIC(LIB, NH_LABEL, "Nexthop label") @@ -240,7 +241,7 @@ void nexthop_del_labels(struct nexthop *nexthop) } } -const char *nexthop2str(struct nexthop *nexthop, char *str, int size) +const char *nexthop2str(const struct nexthop *nexthop, char *str, int size) { switch (nexthop->type) { case NEXTHOP_TYPE_IFINDEX: @@ -310,3 +311,15 @@ unsigned int nexthop_level(struct nexthop *nexthop) return rv; } + +uint32_t nexthop_hash(struct nexthop *nexthop) +{ + uint32_t key; + + key = jhash_1word(nexthop->vrf_id, 0x45afe398); + key = jhash_1word(nexthop->ifindex, key); + key = jhash_1word(nexthop->type, key); + key = jhash(&nexthop->gate, sizeof(union g_addr), key); + + return key; +} diff --git a/lib/nexthop.h b/lib/nexthop.h index 036fc5b888..e4af405d5f 100644 --- a/lib/nexthop.h +++ b/lib/nexthop.h @@ -118,6 +118,23 @@ void nexthop_add_labels(struct nexthop *, enum lsp_types_t, uint8_t, mpls_label_t *); void nexthop_del_labels(struct nexthop *); +/* + * Hash a nexthop. Suitable for use with hash tables. + * + * This function uses the following values when computing the hash: + * - vrf_id + * - ifindex + * - type + * - gate + * + * nexthop + * The nexthop to hash + * + * Returns: + * 32-bit hash of nexthop + */ +uint32_t nexthop_hash(struct nexthop *nexthop); + extern bool nexthop_same(const struct nexthop *nh1, const struct nexthop *nh2); extern const char *nexthop_type_to_str(enum nexthop_types_t nh_type); @@ -126,7 +143,7 @@ extern int nexthop_same_no_recurse(const struct nexthop *next1, extern int nexthop_labels_match(struct nexthop *nh1, struct nexthop *nh2); extern int nexthop_same_firsthop(struct nexthop *next1, struct nexthop *next2); -extern const char *nexthop2str(struct nexthop *nexthop, char *str, int size); +extern const char *nexthop2str(const struct nexthop *nexthop, char *str, int size); extern struct nexthop *nexthop_next(struct nexthop *nexthop); extern unsigned int nexthop_level(struct nexthop *nexthop); #endif /*_LIB_NEXTHOP_H */