src/querier.h

   1 /*
   2  * Author: Steven Barth <steven at midlink.org>
   3  *
   4  * Copyright 2015 Deutsche Telekom AG
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *  http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *
  18  */
  19
  20 #pragma once
  21 #include <libubox/list.h>
  22 #include <libubox/uloop.h>
  23 #include <libubox/avl.h>
  24 #include <netinet/in.h>
  25 #include <net/if.h>
  26 #include <string.h>
  27 #include <stdbool.h>
  28
  29 #include "mrib.h"
  30 #include "groups.h"
  31
  32 struct querier_iface {
  33         struct list_head head;
  34         struct list_head users;
  35         struct uloop_timeout timeout;
  36         struct groups_config cfg;
  37
  38         struct uloop_fd igmp_fd;
  39         omgp_time_t igmp_next_query;
  40         bool igmp_other_querier;
  41         int igmp_startup_tries;
  42
  43         struct uloop_fd mld_fd;
  44         omgp_time_t mld_next_query;
  45         bool mld_other_querier;
  46         int mld_startup_tries;
  47
  48         struct mrib_querier mrib;
  49         struct groups groups;
  50         int ifindex;
  51 };
  52
  53 struct querier;
  54 struct querier_user;
  55 struct querier_user_iface;
  56
  57 typedef void (querier_iface_cb)(struct querier_user_iface *user, const struct in6_addr *group,
  58                 bool include, const struct in6_addr *sources, size_t len);
  59
  60 struct querier_user {
  61         struct list_head head;
  62         struct groups *groups;
  63         struct querier *querier;
  64 };
  65
  66 struct querier_user_iface {
  67         struct list_head head;
  68         struct querier_user user;
  69         struct querier_iface *iface;
  70         querier_iface_cb *user_cb;
  71 };
  72
  73
  74 /* External API */
  75 int querier_init(struct querier *querier);
  76 void querier_deinit(struct querier *querier);
  77
  78 int querier_attach(struct querier_user_iface *user, struct querier *querier,
  79                 int ifindex, querier_iface_cb *cb);
  80 void querier_detach(struct querier_user_iface *user);
  81
  82
  83 /* Internal API */
  84
  85 struct querier {
  86         struct list_head ifaces;
  87 };
  88
  89 #define QUERIER_MAX_SOURCE 75
  90 #define QUERIER_MAX_GROUPS 256
  91 #define QUERIER_SUPPRESS (1 << 3)
  92
  93 static inline in_addr_t querier_unmap(const struct in6_addr *addr6)
  94 {
  95         return addr6->s6_addr32[3];
  96 }
  97
  98 static inline void querier_map(struct in6_addr *addr6, in_addr_t addr4)
  99 {
 100         addr6->s6_addr32[0] = 0;
 101         addr6->s6_addr32[1] = 0;
 102         addr6->s6_addr32[2] = cpu_to_be32(0xffff);
 103         addr6->s6_addr32[3] = addr4;
 104 }
 105
 106 void querier_announce(struct querier_user *user, omgp_time_t now, const struct group *group, bool enabled);
 107 void querier_synthesize_events(struct querier *querier);
 108
 109 int querier_qqi(uint8_t qqic);
 110 int querier_mrd(uint16_t mrc);
 111 uint8_t querier_qqic(int qi);
 112 uint16_t querier_mrc(int mrd);
 113
 114
 115 void igmp_handle(struct mrib_querier *mrib, const struct igmphdr *igmp, size_t len,
 116                 const struct sockaddr_in *from);
 117 int igmp_send_query(struct querier_iface *q,
 118                 const struct in6_addr *group,
 119                 const struct list_head *sources,
 120                 bool suppress);
 121
 122
 123 void mld_handle(struct mrib_querier *mrib, const struct mld_hdr *hdr, size_t len,
 124                 const struct sockaddr_in6 *from);
 125 ssize_t mld_send_query(struct querier_iface *q,
 126                 const struct in6_addr *group,
 127                 const struct list_head *sources,
 128                 bool suppress);
 129