diff options
| -rw-r--r-- | vnet/vnet/ip/ip4_forward.c | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/vnet/vnet/ip/ip4_forward.c b/vnet/vnet/ip/ip4_forward.c index 1862d89d..4b019bce 100644 --- a/vnet/vnet/ip/ip4_forward.c +++ b/vnet/vnet/ip/ip4_forward.c @@ -79,7 +79,7 @@ ip4_fib_lookup_with_table (ip4_main_t * im, u32 fib_index, goto done; } } - + /* Nothing matches in table. */ ai = lm->miss_adj_index; @@ -87,6 +87,11 @@ ip4_fib_lookup_with_table (ip4_main_t * im, u32 fib_index, return ai; } +/** @brief Create FIB from table ID and init all hashing. + @param im - @ref ip4_main_t + @param table_id - table ID + @return fib - @ref ip4_fib_t +*/ static ip4_fib_t * create_fib_with_table_id (ip4_main_t * im, u32 table_id) { @@ -95,6 +100,7 @@ create_fib_with_table_id (ip4_main_t * im, u32 table_id) vec_add2 (im->fibs, fib, 1); fib->table_id = table_id; fib->index = fib - im->fibs; + /* IP_FLOW_HASH_DEFAULT is net value of 5 tuple flags without "reverse" bit */ fib->flow_hash_config = IP_FLOW_HASH_DEFAULT; fib->fwd_classify_table_index = ~0; fib->rev_classify_table_index = ~0; @@ -102,28 +108,41 @@ create_fib_with_table_id (ip4_main_t * im, u32 table_id) return fib; } +/** @brief Find existing or Create new FIB based on index + @param im @ref ip4_main_t + @param table_index_or_id - overloaded parameter referring + to the table or a table's index in the FIB vector + @param flags - used to check if table_index_or_id was a table or + an index (detected by @ref IP4_ROUTE_FLAG_FIB_INDEX) + @return either the existing or a new ip4_fib_t entry +*/ ip4_fib_t * -find_ip4_fib_by_table_index_or_id (ip4_main_t * im, +find_ip4_fib_by_table_index_or_id (ip4_main_t * im, u32 table_index_or_id, u32 flags) { uword * p, fib_index; fib_index = table_index_or_id; + /* If this isn't a FIB_INDEX ... */ if (! (flags & IP4_ROUTE_FLAG_FIB_INDEX)) { + /* If passed ~0 then request the next table available */ if (table_index_or_id == ~0) { table_index_or_id = 0; while ((p = hash_get (im->fib_index_by_table_id, table_index_or_id))) { table_index_or_id++; } - return create_fib_with_table_id (im, table_index_or_id); + /* Create the next table and return the ip4_fib_t associated with it */ + return create_fib_with_table_id (im, table_index_or_id); } - + /* A specific table_id was requested.. */ p = hash_get (im->fib_index_by_table_id, table_index_or_id); + /* ... and if it doesn't exist create it else grab its index */ if (! p) return create_fib_with_table_id (im, table_index_or_id); fib_index = p[0]; } + /* Return the ip4_fib_t associated with this index */ return vec_elt_at_index (im->fibs, fib_index); } |