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Annotation of embedaddon/quagga/pimd/pim_oil.c, revision 1.1

1.1     ! misho       1: /*
        !             2:   PIM for Quagga
        !             3:   Copyright (C) 2008  Everton da Silva Marques
        !             4: 
        !             5:   This program is free software; you can redistribute it and/or modify
        !             6:   it under the terms of the GNU General Public License as published by
        !             7:   the Free Software Foundation; either version 2 of the License, or
        !             8:   (at your option) any later version.
        !             9: 
        !            10:   This program is distributed in the hope that it will be useful, but
        !            11:   WITHOUT ANY WARRANTY; without even the implied warranty of
        !            12:   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            13:   General Public License for more details.
        !            14:   
        !            15:   You should have received a copy of the GNU General Public License
        !            16:   along with this program; see the file COPYING; if not, write to the
        !            17:   Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
        !            18:   MA 02110-1301 USA
        !            19:   
        !            20:   $QuaggaId: $Format:%an, %ai, %h$ $
        !            21: */
        !            22: 
        !            23: #include <zebra.h>
        !            24: 
        !            25: #include "log.h"
        !            26: #include "memory.h"
        !            27: #include "linklist.h"
        !            28: 
        !            29: #include "pimd.h"
        !            30: #include "pim_oil.h"
        !            31: #include "pim_str.h"
        !            32: #include "pim_iface.h"
        !            33: 
        !            34: void pim_channel_oil_free(struct channel_oil *c_oil)
        !            35: {
        !            36:   XFREE(MTYPE_PIM_CHANNEL_OIL, c_oil);
        !            37: }
        !            38: 
        !            39: static void pim_channel_oil_delete(struct channel_oil *c_oil)
        !            40: {
        !            41:   /*
        !            42:     notice that listnode_delete() can't be moved
        !            43:     into pim_channel_oil_free() because the later is
        !            44:     called by list_delete_all_node()
        !            45:   */
        !            46:   listnode_delete(qpim_channel_oil_list, c_oil);
        !            47: 
        !            48:   pim_channel_oil_free(c_oil);
        !            49: }
        !            50: 
        !            51: static struct channel_oil *channel_oil_new(struct in_addr group_addr,
        !            52:                                           struct in_addr source_addr,
        !            53:                                           int input_vif_index)
        !            54: {
        !            55:   struct channel_oil *c_oil;
        !            56:   struct interface *ifp_in;
        !            57: 
        !            58:   ifp_in = pim_if_find_by_vif_index(input_vif_index);
        !            59:   if (!ifp_in) {
        !            60:     /* warning only */
        !            61:     char group_str[100]; 
        !            62:     char source_str[100];
        !            63:     pim_inet4_dump("<group?>", group_addr, group_str, sizeof(group_str));
        !            64:     pim_inet4_dump("<source?>", source_addr, source_str, sizeof(source_str));
        !            65:     zlog_warn("%s: (S,G)=(%s,%s) could not find input interface for input_vif_index=%d",
        !            66:              __PRETTY_FUNCTION__,
        !            67:              source_str, group_str, input_vif_index);
        !            68:   }
        !            69: 
        !            70:   c_oil = XCALLOC(MTYPE_PIM_CHANNEL_OIL, sizeof(*c_oil));
        !            71:   if (!c_oil) {
        !            72:     zlog_err("PIM XCALLOC(%zu) failure", sizeof(*c_oil));
        !            73:     return 0;
        !            74:   }
        !            75: 
        !            76:   c_oil->oil.mfcc_mcastgrp = group_addr;
        !            77:   c_oil->oil.mfcc_origin   = source_addr;
        !            78:   c_oil->oil.mfcc_parent   = input_vif_index;
        !            79:   c_oil->oil_ref_count     = 1;
        !            80: 
        !            81:   zassert(c_oil->oil_size == 0);
        !            82: 
        !            83:   return c_oil;
        !            84: }
        !            85: 
        !            86: static struct channel_oil *pim_add_channel_oil(struct in_addr group_addr,
        !            87:                                               struct in_addr source_addr,
        !            88:                                               int input_vif_index)
        !            89: {
        !            90:   struct channel_oil *c_oil;
        !            91: 
        !            92:   c_oil = channel_oil_new(group_addr, source_addr, input_vif_index);
        !            93:   if (!c_oil) {
        !            94:     zlog_warn("PIM XCALLOC(%zu) failure", sizeof(*c_oil));
        !            95:     return 0;
        !            96:   }
        !            97: 
        !            98:   listnode_add(qpim_channel_oil_list, c_oil);
        !            99: 
        !           100:   return c_oil;
        !           101: }
        !           102: 
        !           103: static struct channel_oil *pim_find_channel_oil(struct in_addr group_addr,
        !           104:                                                struct in_addr source_addr)
        !           105: {
        !           106:   struct listnode    *node;
        !           107:   struct channel_oil *c_oil;
        !           108: 
        !           109:   for (ALL_LIST_ELEMENTS_RO(qpim_channel_oil_list, node, c_oil)) {
        !           110:     if ((group_addr.s_addr == c_oil->oil.mfcc_mcastgrp.s_addr) &&
        !           111:        (source_addr.s_addr == c_oil->oil.mfcc_origin.s_addr))
        !           112:       return c_oil;
        !           113:   }
        !           114:   
        !           115:   return 0;
        !           116: }
        !           117: 
        !           118: struct channel_oil *pim_channel_oil_add(struct in_addr group_addr,
        !           119:                                        struct in_addr source_addr,
        !           120:                                        int input_vif_index)
        !           121: {
        !           122:   struct channel_oil *c_oil;
        !           123: 
        !           124:   c_oil = pim_find_channel_oil(group_addr, source_addr);
        !           125:   if (c_oil) {
        !           126:     ++c_oil->oil_ref_count;
        !           127:     return c_oil;
        !           128:   }
        !           129: 
        !           130:   return pim_add_channel_oil(group_addr, source_addr, input_vif_index);
        !           131: }
        !           132: 
        !           133: void pim_channel_oil_del(struct channel_oil *c_oil)
        !           134: {
        !           135:   --c_oil->oil_ref_count;
        !           136: 
        !           137:   if (c_oil->oil_ref_count < 1) {
        !           138:     pim_channel_oil_delete(c_oil);
        !           139:   }
        !           140: }