/*
 * Copyright (c) 2016 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <vlib/vlib.h>
#include <vnet/dpo/drop_dpo.h>

#include <vnet/mfib/mfib_table.h>
#include <vnet/mfib/ip4_mfib.h>
#include <vnet/mfib/ip6_mfib.h>
#include <vnet/mfib/mfib_entry.h>
#include <vnet/mfib/mfib_entry_src.h>
#include <vnet/mfib/mfib_entry_cover.h>
#include <vnet/mfib/mfib_signal.h>

const static char * mfib_table_flags_strings[] = MFIB_TABLE_ATTRIBUTES;

mfib_table_t *
mfib_table_get (fib_node_index_t index,
                fib_protocol_t proto)
{
    switch (proto)
    {
    case FIB_PROTOCOL_IP4:
        return (pool_elt_at_index(ip4_main.mfibs, index));
    case FIB_PROTOCOL_IP6:
        return (pool_elt_at_index(ip6_main.mfibs, index));
    case FIB_PROTOCOL_MPLS:
        break;
    }
    ASSERT(0);
    return (NULL);
}

static inline fib_node_index_t
mfib_table_lookup_i (const mfib_table_t *mfib_table,
                     const mfib_prefix_t *prefix)
{
    switch (prefix->fp_proto)
    {
    case FIB_PROTOCOL_IP4:
        return (ip4_mfib_table_lookup(&mfib_table->v4,
                                      &prefix->fp_src_addr.ip4,
                                      &prefix->fp_grp_addr.ip4,
                                      prefix->fp_len));
    case FIB_PROTOCOL_IP6:
        return (ip6_mfib_table_lookup(&mfib_table->v6,
                                      &prefix->fp_src_addr.ip6,
                                      &prefix->fp_grp_addr.ip6,
                                      prefix->fp_len));
    case FIB_PROTOCOL_MPLS:
        break;
    }
    return (FIB_NODE_INDEX_INVALID);
}

fib_node_index_t
mfib_table_lookup (u32 fib_index,
                   const mfib_prefix_t *prefix)
{
    return (mfib_table_lookup_i(mfib_table_get(fib_index, prefix->fp_proto), prefix));
}

static inline fib_node_index_t
mfib_table_lookup_exact_match_i (const mfib_table_t *mfib_table,
                                 const mfib_prefix_t *prefix)
{
    switch (prefix->fp_proto)
    {
    case FIB_PROTOCOL_IP4:
        return (ip4_mfib_table_lookup_exact_match(&mfib_table->v4,
                                                  &prefix->fp_grp_addr.ip4,
                                                  &prefix->fp_src_addr.ip4,
                                                  prefix->fp_len));
    case FIB_PROTOCOL_IP6:
        return (ip6_mfib_table_lookup_exact_match(&mfib_table->v6,
                                                  &prefix->fp_grp_addr.ip6,
                                                  &prefix->fp_src_addr.ip6,
                                                  prefix->fp_len));
    case FIB_PROTOCOL_MPLS:
        break;
    }
    return (FIB_NODE_INDEX_INVALID);
}

fib_node_index_t
mfib_table_lookup_exact_match (u32 fib_index,
                              const mfib_prefix_t *prefix)
{
    return (mfib_table_lookup_exact_match_i(mfib_table_get(fib_index,
                                                          prefix->fp_proto),
                                            prefix));
}

static fib_node_index_t
mfib_table_get_less_specific_i (const mfib_table_t *mfib_table,
                                const mfib_prefix_t *prefix)
{
    switch (prefix->fp_proto)
    {
    case FIB_PROTOCOL_IP4:
        return (ip4_mfib_table_get_less_specific(&mfib_table->v4,
                                                 &prefix->fp_src_addr.ip4,
                                                 &prefix->fp_grp_addr.ip4,
                                                 prefix->fp_len));
    case FIB_PROTOCOL_IP6:
        return (ip6_mfib_table_get_less_specific(&mfib_table->v6,
                                                 &prefix->fp_src_addr.ip6,
                                                 &prefix->fp_grp_addr.ip6,
                                                 prefix->fp_len));
    case FIB_PROTOCOL_MPLS:
        break;
    }
    return (FIB_NODE_INDEX_INVALID);
}

fib_node_index_t
mfib_table_get_less_specific (u32 fib_index,
                              const mfib_prefix_t *prefix)
{
    return (mfib_table_get_less_specific_i(mfib_table_get(fib_index,
                                                          prefix->fp_proto),
                                           prefix));
}

static void
mfib_table_entry_remove (mfib_table_t *mfib_table,
                         const mfib_prefix_t *prefix,
                         fib_node_index_t mfib_entry_index)
{
    vlib_smp_unsafe_warning();

    mfib_table->mft_total_route_counts--;

    switch (prefix->fp_proto)
    {
    case FIB_PROTOCOL_IP4:
        ip4_mfib_table_entry_remove(&mfib_table->v4,
                                    &prefix->fp_grp_addr.ip4,
                                    &prefix->fp_src_addr.ip4,
                                    prefix->fp_len);
        break;
    case FIB_PROTOCOL_IP6:
        ip6_mfib_table_entry_remove(&mfib_table->v6,
                                    &prefix->fp_grp_addr.ip6,
                                    &prefix->fp_src_addr.ip6,
                                    prefix->fp_len);
        break;
    case FIB_PROTOCOL_MPLS:
        ASSERT(0);
        break;
    }

    mfib_entry_cover_change_notify(mfib_entry_index,
                                   FIB_NODE_INDEX_INVALID);
    mfib_entry_unlock(mfib_entry_index);
}

static void
mfib_table_post_insert_actions (mfib_table_t *mfib_table,
                                const mfib_prefix_t *prefix,
                                fib_node_index_t mfib_entry_index)
{
    fib_node_index_t mfib_entry_cover_index;

    /*
     * find  the covering entry
     */
    mfib_entry_cover_index = mfib_table_get_less_specific_i(mfib_table,
                                                            prefix);
    /*
     * the indicies are the same when the default route is first added
     */
    if (mfib_entry_cover_index != mfib_entry_index)
    {
        /*
         * inform the covering entry that a new more specific
         * has been inserted beneath it.
         * If the prefix that has been inserted is a host route
         * then it is not possible that it will be the cover for any
         * other entry, so we can elide the walk.
         */
        if (!mfib_entry_is_host(mfib_entry_index))
        {
            mfib_entry_cover_change_notify(mfib_entry_cover_index,
                                           mfib_entry_index);
        }
    }
}


static void
mfib_table_entry_insert (mfib_table_t *mfib_table,
                         const mfib_prefix_t *prefix,
                         fib_node_index_t mfib_entry_index)
{
    vlib_smp_unsafe_warning();

    mfib_entry_lock(mfib_entry_index);
    mfib_table->mft_total_route_counts++;

    switch (prefix->fp_proto)
    {
    case FIB_PROTOCOL_IP4:
        ip4_mfib_table_entry_insert(&mfib_table->v4,
                                    &prefix->fp_grp_addr.ip4,
                                    &prefix->fp_src_addr.ip4,
                                    prefix->fp_len,
                                    mfib_entry_index);
        break;
    case FIB_PROTOCOL_IP6:
        ip6_mfib_table_entry_insert(&mfib_table->v6,
                                    &prefix->fp_grp_addr.ip6,
                                    &prefix->fp_src_addr.ip6,
                                    prefix->fp_len,
                                    mfib_entry_index);
        break;
    case FIB_PROTOCOL_MPLS:
        break;
    }

    mfib_table_post_insert_actions(mfib_table, prefix, mfib_entry_index);
}

fib_node_index_t
mfib_table_entry_update (u32 fib_index,
                         const mfib_prefix_t *prefix,
                         mfib_source_t source,
                         fib_rpf_id_t rpf_id,
                         mfib_entry_flags_t entry_flags)
{
    fib_node_index_t mfib_entry_index;
    mfib_table_t *mfib_table;

    mfib_table = mfib_table_get(fib_index, prefix->fp_proto);
    mfib_entry_index = mfib_table_lookup_exact_match_i(mfib_table, prefix);

    if (FIB_NODE_INDEX_INVALID == mfib_entry_index)
    {
        if (MFIB_ENTRY_FLAG_NONE != entry_flags)
        {
            /*
             * update to a non-existing entry with non-zero flags
             */
            mfib_entry_index = mfib_entry_create(fib_index, source,
                                                 prefix, rpf_id,
                                                 entry_flags,
                                                 INDEX_INVALID);

            mfib_table_entry_insert(mfib_table, prefix, mfib_entry_index);
        }
        /*
         * else
         *   the entry doesn't exist and the request is to set no flags
         *   the result would be an entry that doesn't exist - so do nothing
         */
    }
    else
    {
        mfib_entry_lock(mfib_entry_index);

        if (mfib_entry_update(mfib_entry_index,
                              source,
                              entry_flags,
                              rpf_id,
                              INDEX_INVALID))
        {
            /*
             * this update means we can now remove the entry.
             */
            mfib_table_entry_remove(mfib_table, prefix, mfib_entry_index);
        }

        mfib_entry_unlock(mfib_entry_index);
    }

    return (mfib_entry_index);
}

static fib_node_index_t
mfib_table_entry_paths_update_i (u32 fib_index,
                                 const mfib_prefix_t *prefix,
                                 mfib_source_t source,
                                 const fib_route_path_t *rpaths)
{
    fib_node_index_t mfib_entry_index;
    mfib_table_t *mfib_table;

    mfib_table = mfib_table_get(fib_index, prefix->fp_proto);
    mfib_entry_index = mfib_table_lookup_exact_match_i(mfib_table, prefix);

    if (FIB_NODE_INDEX_INVALID == mfib_entry_index)
    {
        mfib_entry_index = mfib_entry_create(fib_index,
                                             source,
                                             prefix,
                                             MFIB_RPF_ID_NONE,
                                             MFIB_ENTRY_FLAG_NONE,
                                             INDEX_INVALID);

        mfib_entry_path_update(mfib_entry_index, source, rpaths);

        mfib_table_entry_insert(mfib_table, prefix, mfib_entry_index);
    }
    else
    {
        mfib_entry_path_update(mfib_entry_index, source, rpaths);
    }
    return (mfib_entry_index);
}


fib_node_index_t
mfib_table_entry_path_update (u32 fib_index,
                              const mfib_prefix_t *prefix,
                              mfib_source_t source,
                              const fib_route_path_t *rpath)
{
    fib_node_index_t mfib_entry_index;
    fib_route_path_t *rpaths = NULL;

    vec_add1(rpaths, *rpath);

    mfib_entry_index = mfib_table_entry_paths_update_i(fib_index, prefix,
                                                       source, rpaths);

    vec_free(rpaths);
    return (mfib_entry_index);
}

fib_node_index_t
mfib_table_entry_paths_update (u32 fib_index,
                              const mfib_prefix_t *prefix,
                              mfib_source_t source,
                              const fib_route_path_t *rpaths)
{
    return (mfib_table_entry_paths_update_i(fib_index, prefix,
                                            source, rpaths));
}

static void
mfib_table_entry_paths_remove_i (u32 fib_index,
                                 const mfib_prefix_t *prefix,
                                 mfib_source_t source,
                                 const fib_route_path_t *rpaths)
{
    fib_node_index_t mfib_entry_index;
    mfib_table_t *mfib_table;

    mfib_table = mfib_table_get(fib_index, prefix->fp_proto);
    mfib_entry_index = mfib_table_lookup_exact_match_i(mfib_table, prefix);

    if (FIB_NODE_INDEX_INVALID == mfib_entry_index)
    {
        /*
         * removing an entry that does not exist. i'll allow it.
         */
    }
    else
    {
        int no_more_sources;

        /*
         * don't nobody go nowhere
         */
        mfib_entry_lock(mfib_entry_index);

        no_more_sources = mfib_entry_path_remove(mfib_entry_index,
                                                 source,
                                                 rpaths);

        if (no_more_sources)
        {
            /*
             * last source gone. remove from the table
             */
            mfib_table_entry_remove(mfib_table, prefix, mfib_entry_index);
        }

        mfib_entry_unlock(mfib_entry_index);
    }
}
void
mfib_table_entry_paths_remove (u32 fib_index,
                              const mfib_prefix_t *prefix,
                              mfib_source_t source,
                              const fib_route_path_t *rpaths)
{
    mfib_table_entry_paths_remove_i(fib_index,
                                    prefix,
                                    source,
                                    rpaths);
}

void
mfib_table_entry_path_remove (u32 fib_index,
                              const mfib_prefix_t *prefix,
                              mfib_source_t source,
                              const fib_route_path_t *rpath)
{
    fib_route_path_t *rpaths = NULL;

    vec_add1(rpaths, *rpath);

    mfib_table_entry_paths_remove_i(fib_index,
                                    prefix,
                                    source,
                                    rpaths);

    vec_free(rpaths);
}

fib_node_index_t
mfib_table_entry_special_add (u32 fib_index,
                              const mfib_prefix_t *prefix,
                              mfib_source_t source,
                              mfib_entry_flags_t entry_flags,
                              index_t repi)
{
    fib_node_index_t mfib_entry_index;
    mfib_table_t *mfib_table;

    mfib_table = mfib_table_get(fib_index, prefix->fp_proto);
    mfib_entry_index = mfib_table_lookup_exact_match_i(mfib_table, prefix);

    if (INDEX_INVALID != repi)
    {
        entry_flags |= MFIB_ENTRY_FLAG_EXCLUSIVE;
    }

    if (FIB_NODE_INDEX_INVALID == mfib_entry_index)
    {
        mfib_entry_index = mfib_entry_create(fib_index,
                                             source,
                                             prefix,
                                             MFIB_RPF_ID_NONE,
                                             entry_flags,
                                             repi);

        mfib_table_entry_insert(mfib_table, prefix, mfib_entry_index);
    }
    else
    {
        mfib_entry_special_add(mfib_entry_index, source, entry_flags,
                               MFIB_RPF_ID_NONE, repi);
    }

    return (mfib_entry_index);
}

static void
mfib_table_entry_delete_i (u32 fib_index,
                           fib_node_index_t mfib_entry_index,
                           const mfib_prefix_t *prefix,
                           mfib_source_t source)
{
    mfib_table_t *mfib_table;

    mfib_table = mfib_table_get(fib_index, prefix->fp_proto);

    /*
     * don't nobody go nowhere
     */
    mfib_entry_lock(mfib_entry_index);

    if (mfib_entry_delete(mfib_entry_index, source))
    {
        /*
         * last source gone. remove from the table
         */
        mfib_table_entry_remove(mfib_table, prefix, mfib_entry_index);
    }
    /*
     * else
     *   still has sources, leave it be.
     */

    mfib_entry_unlock(mfib_entry_index);
}

void
mfib_table_entry_delete (u32 fib_index,
                         const mfib_prefix_t *prefix,
                         mfib_source_t source)
{
    fib_node_index_t mfib_entry_index;

    mfib_entry_index = mfib_table_lookup_exact_match(fib_index, prefix);

    if (FIB_NODE_INDEX_INVALID == mfib_entry_index)
    {
        /*
         * removing an etry that does not exist.
         * i'll allow it, but i wo<style>
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.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
}
</style><div class="highlight"><pre><span></span><span class="c"># Copyright (c) 2018 Cisco and/or its affiliates.</span>
<span class="c"># Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span>
<span class="c"># you may not use this file except in compliance with the License.</span>
<span class="c"># You may obtain a copy of the License at:</span>
<span class="c">#</span>
<span class="c">#     http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="c">#</span>
<span class="c"># Unless required by applicable law or agreed to in writing, software</span>
<span class="c"># distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span>
<span class="c"># WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="c"># See the Lice