pimd/pim_igmp.h

   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 along
  16  * with this program; see the file COPYING; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #ifndef PIM_IGMP_H
  21 #define PIM_IGMP_H
  22
  23 #include <netinet/in.h>
  24
  25 #include <zebra.h>
  26 #include "vty.h"
  27 #include "linklist.h"
  28
  29 /*
  30   The following sizes are likely to support
  31   any message sent within local MTU.
  32 */
  33 #define PIM_IGMP_BUFSIZE_READ         (20000)
  34 #define PIM_IGMP_BUFSIZE_WRITE        (20000)
  35
  36 #define PIM_IGMP_MEMBERSHIP_QUERY     (0x11)
  37 #define PIM_IGMP_V1_MEMBERSHIP_REPORT (0x12)
  38 #define PIM_IGMP_V2_MEMBERSHIP_REPORT (0x16)
  39 #define PIM_IGMP_V2_LEAVE_GROUP       (0x17)
  40 #define PIM_IGMP_V3_MEMBERSHIP_REPORT (0x22)
  41
  42 #define IGMP_V3_REPORT_HEADER_SIZE    (8)
  43 #define IGMP_V3_GROUP_RECORD_MIN_SIZE (8)
  44 #define IGMP_V3_MSG_MIN_SIZE                                                   \
  45         (IGMP_V3_REPORT_HEADER_SIZE + IGMP_V3_GROUP_RECORD_MIN_SIZE)
  46 #define IGMP_V12_MSG_SIZE             (8)
  47
  48 #define IGMP_V3_GROUP_RECORD_TYPE_OFFSET       (0)
  49 #define IGMP_V3_GROUP_RECORD_AUXDATALEN_OFFSET (1)
  50 #define IGMP_V3_GROUP_RECORD_NUMSOURCES_OFFSET (2)
  51 #define IGMP_V3_GROUP_RECORD_GROUP_OFFSET      (4)
  52 #define IGMP_V3_GROUP_RECORD_SOURCE_OFFSET     (8)
  53 #define IGMP_CHECKSUM_OFFSET                   (2)
  54
  55 /* RFC 3376: 8.1. Robustness Variable - Default: 2 */
  56 #define IGMP_DEFAULT_ROBUSTNESS_VARIABLE           (2)
  57
  58 /* RFC 3376: 8.2. Query Interval - Default: 125 seconds */
  59 #define IGMP_GENERAL_QUERY_INTERVAL                (125)
  60
  61 /* RFC 3376: 8.3. Query Response Interval - Default: 100 deciseconds */
  62 #define IGMP_QUERY_MAX_RESPONSE_TIME_DSEC          (100)
  63
  64 /* RFC 3376: 8.8. Last Member Query Interval - Default: 10 deciseconds */
  65 #define IGMP_SPECIFIC_QUERY_MAX_RESPONSE_TIME_DSEC (10)
  66
  67 #define IGMP_DEFAULT_VERSION (3)
  68
  69 struct igmp_join {
  70         struct in_addr group_addr;
  71         struct in_addr source_addr;
  72         int sock_fd;
  73         time_t sock_creation;
  74 };
  75
  76 struct igmp_sock {
  77         int fd;
  78         struct interface *interface;
  79         struct in_addr ifaddr;
  80         time_t sock_creation;
  81
  82         struct thread *t_igmp_read; /* read: IGMP sockets */
  83         struct thread
  84                 *t_igmp_query_timer; /* timer: issue IGMP general queries */
  85         struct thread *t_other_querier_timer; /* timer: other querier present */
  86
  87         int querier_query_interval;      /* QQI */
  88         int querier_robustness_variable; /* QRV */
  89         int startup_query_count;
  90
  91         struct list *igmp_group_list; /* list of struct igmp_group */
  92         struct hash *igmp_group_hash;
  93 };
  94
  95 struct igmp_sock *pim_igmp_sock_lookup_ifaddr(struct list *igmp_sock_list,
  96                                               struct in_addr ifaddr);
  97 struct igmp_sock *igmp_sock_lookup_by_fd(struct list *igmp_sock_list, int fd);
  98 struct igmp_sock *pim_igmp_sock_add(struct list *igmp_sock_list,
  99                                     struct in_addr ifaddr,
 100                                     struct interface *ifp);
 101 void igmp_sock_delete(struct igmp_sock *igmp);
 102 void igmp_sock_free(struct igmp_sock *igmp);
 103 void igmp_sock_delete_all(struct interface *ifp);
 104 int pim_igmp_packet(struct igmp_sock *igmp, char *buf, size_t len);
 105
 106 void pim_igmp_general_query_on(struct igmp_sock *igmp);
 107 void pim_igmp_general_query_off(struct igmp_sock *igmp);
 108 void pim_igmp_other_querier_timer_on(struct igmp_sock *igmp);
 109 void pim_igmp_other_querier_timer_off(struct igmp_sock *igmp);
 110
 111 #define IGMP_SOURCE_MASK_FORWARDING        (1 << 0)
 112 #define IGMP_SOURCE_MASK_DELETE            (1 << 1)
 113 #define IGMP_SOURCE_MASK_SEND              (1 << 2)
 114 #define IGMP_SOURCE_TEST_FORWARDING(flags) ((flags) & IGMP_SOURCE_MASK_FORWARDING)
 115 #define IGMP_SOURCE_TEST_DELETE(flags)     ((flags) & IGMP_SOURCE_MASK_DELETE)
 116 #define IGMP_SOURCE_TEST_SEND(flags)       ((flags) & IGMP_SOURCE_MASK_SEND)
 117 #define IGMP_SOURCE_DO_FORWARDING(flags)   ((flags) |= IGMP_SOURCE_MASK_FORWARDING)
 118 #define IGMP_SOURCE_DO_DELETE(flags)       ((flags) |= IGMP_SOURCE_MASK_DELETE)
 119 #define IGMP_SOURCE_DO_SEND(flags)         ((flags) |= IGMP_SOURCE_MASK_SEND)
 120 #define IGMP_SOURCE_DONT_FORWARDING(flags) ((flags) &= ~IGMP_SOURCE_MASK_FORWARDING)
 121 #define IGMP_SOURCE_DONT_DELETE(flags)     ((flags) &= ~IGMP_SOURCE_MASK_DELETE)
 122 #define IGMP_SOURCE_DONT_SEND(flags)       ((flags) &= ~IGMP_SOURCE_MASK_SEND)
 123
 124 struct igmp_source {
 125         struct in_addr source_addr;
 126         struct thread *t_source_timer;
 127         struct igmp_group *source_group; /* back pointer */
 128         time_t source_creation;
 129         uint32_t source_flags;
 130         struct channel_oil *source_channel_oil;
 131
 132         /*
 133           RFC 3376: 6.6.3.2. Building and Sending Group and Source Specific
 134           Queries
 135         */
 136         int source_query_retransmit_count;
 137 };
 138
 139 struct igmp_group {
 140         /*
 141           RFC 3376: 6.2.2. Definition of Group Timers
 142
 143           The group timer is only used when a group is in EXCLUDE mode and it
 144           represents the time for the *filter-mode* of the group to expire and
 145           switch to INCLUDE mode.
 146         */
 147         struct thread *t_group_timer;
 148
 149         /* Shared between group-specific and
 150            group-and-source-specific retransmissions */
 151         struct thread *t_group_query_retransmit_timer;
 152
 153         /* Counter exclusive for group-specific retransmissions
 154            (not used by group-and-source-specific retransmissions,
 155            since sources have their counters) */
 156         int group_specific_query_retransmit_count;
 157
 158         /* compatibility mode - igmp v1, v2 or v3 */
 159         int igmp_version;
 160
 161         struct in_addr group_addr;
 162         int group_filtermode_isexcl;    /* 0=INCLUDE, 1=EXCLUDE */
 163         struct list *group_source_list; /* list of struct igmp_source */
 164         time_t group_creation;
 165         struct igmp_sock *group_igmp_sock; /* back pointer */
 166         int64_t last_igmp_v1_report_dsec;
 167         int64_t last_igmp_v2_report_dsec;
 168 };
 169
 170 struct igmp_group *find_group_by_addr(struct igmp_sock *igmp,
 171                                       struct in_addr group_addr);
 172 struct igmp_group *igmp_add_group_by_addr(struct igmp_sock *igmp,
 173                                           struct in_addr group_addr);
 174
 175 void igmp_group_delete_empty_include(struct igmp_group *group);
 176
 177 void igmp_startup_mode_on(struct igmp_sock *igmp);
 178
 179 void igmp_group_timer_on(struct igmp_group *group, long interval_msec,
 180                          const char *ifname);
 181
 182 struct igmp_source *source_new(struct igmp_group *group,
 183                                struct in_addr src_addr);
 184
 185 void igmp_send_query(int igmp_version, struct igmp_group *group, int fd,
 186                      const char *ifname, char *query_buf, int query_buf_size,
 187                      int num_sources, struct in_addr dst_addr,
 188                      struct in_addr group_addr,
 189                      int query_max_response_time_dsec, uint8_t s_flag,
 190                      uint8_t querier_robustness_variable,
 191                      uint16_t querier_query_interval);
 192 #endif /* PIM_IGMP_H */