pimd/pim_msdp.h

   1 /*
   2  * IP MSDP for Quagga
   3  * Copyright (C) 2016 Cumulus Networks, Inc.
   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 #ifndef PIM_MSDP_H
  20 #define PIM_MSDP_H
  21
  22 enum pim_msdp_peer_state {
  23         PIM_MSDP_DISABLED,
  24         PIM_MSDP_INACTIVE,
  25         PIM_MSDP_LISTEN,
  26         PIM_MSDP_CONNECTING,
  27         PIM_MSDP_ESTABLISHED
  28 };
  29
  30 /* SA and KA TLVs are processed; rest ignored */
  31 enum pim_msdp_tlv {
  32         PIM_MSDP_V4_SOURCE_ACTIVE = 1,
  33         PIM_MSDP_V4_SOURCE_ACTIVE_REQUEST,
  34         PIM_MSDP_V4_SOURCE_ACTIVE_RESPONSE,
  35         PIM_MSDP_KEEPALIVE,
  36         PIM_MSDP_RESERVED,
  37         PIM_MSDP_TRACEROUTE_PROGRESS,
  38         PIM_MSDP_TRACEROUTE_REPLY,
  39 };
  40
  41 /* MSDP error codes */
  42 enum pim_msdp_err {
  43         PIM_MSDP_ERR_NONE = 0,
  44         PIM_MSDP_ERR_OOM = -1,
  45         PIM_MSDP_ERR_PEER_EXISTS = -2,
  46         PIM_MSDP_ERR_MAX_MESH_GROUPS = -3,
  47         PIM_MSDP_ERR_NO_PEER = -4,
  48         PIM_MSDP_ERR_MG_MBR_EXISTS = -5,
  49         PIM_MSDP_ERR_NO_MG = -6,
  50         PIM_MSDP_ERR_NO_MG_MBR = -7,
  51         PIM_MSDP_ERR_SIP_EQ_DIP = -8,
  52 };
  53
  54 #define PIM_MSDP_STATE_STRLEN 16
  55 #define PIM_MSDP_UPTIME_STRLEN 80
  56 #define PIM_MSDP_TIMER_STRLEN 12
  57 #define PIM_MSDP_TCP_PORT 639
  58 #define PIM_MSDP_SOCKET_SNDBUF_SIZE 65536
  59
  60 enum pim_msdp_sa_flags {
  61         PIM_MSDP_SAF_NONE = 0,
  62         /* There are two cases where we can pickup an active source locally -
  63          * 1. We are RP and got a source-register from the FHR
  64          * 2. We are RP and FHR and learnt a new directly connected source on a
  65          * DR interface */
  66         PIM_MSDP_SAF_LOCAL = (1 << 0),
  67         /* We got this in the MSDP SA TLV from a peer (and this passed peer-RPF
  68          * checks) */
  69         PIM_MSDP_SAF_PEER = (1 << 1),
  70         PIM_MSDP_SAF_REF = (PIM_MSDP_SAF_LOCAL | PIM_MSDP_SAF_PEER),
  71         PIM_MSDP_SAF_STALE = (1 << 2), /* local entries can get kicked out on
  72                                         * misc pim events such as RP change */
  73         PIM_MSDP_SAF_UP_DEL_IN_PROG = (1 << 3)
  74 };
  75
  76 struct pim_msdp_sa {
  77         struct pim_instance *pim;
  78
  79         struct prefix_sg sg;
  80         char sg_str[PIM_SG_LEN];
  81         struct in_addr rp;   /* Last RP address associated with this SA */
  82         struct in_addr peer; /* last peer from who we heard this SA */
  83         enum pim_msdp_sa_flags flags;
  84
  85 /* rfc-3618 is missing default value for SA-hold-down-Period. pulled
  86  * this number from industry-standards */
  87 #define PIM_MSDP_SA_HOLD_TIME ((3*60)+30)
  88         struct thread *sa_state_timer; // 5.6
  89         int64_t uptime;
  90
  91         struct pim_upstream *up;
  92 };
  93
  94 enum pim_msdp_peer_flags {
  95         PIM_MSDP_PEERF_NONE = 0,
  96         PIM_MSDP_PEERF_LISTENER = (1 << 0),
  97 #define PIM_MSDP_PEER_IS_LISTENER(mp) (mp->flags & PIM_MSDP_PEERF_LISTENER)
  98         PIM_MSDP_PEERF_SA_JUST_SENT = (1 << 1)
  99 };
 100
 101 struct pim_msdp_peer {
 102         struct pim_instance *pim;
 103
 104         /* configuration */
 105         struct in_addr local;
 106         struct in_addr peer;
 107         char *mesh_group_name;
 108         char key_str[INET_ADDRSTRLEN];
 109
 110         /* state */
 111         enum pim_msdp_peer_state state;
 112         enum pim_msdp_peer_flags flags;
 113
 114         /* TCP socket info */
 115         union sockunion su_local;
 116         union sockunion su_peer;
 117         int fd;
 118
 119 /* protocol timers */
 120 #define PIM_MSDP_PEER_HOLD_TIME 75
 121         struct thread *hold_timer; // 5.4
 122 #define PIM_MSDP_PEER_KA_TIME 60
 123         struct thread *ka_timer; // 5.5
 124 #define PIM_MSDP_PEER_CONNECT_RETRY_TIME 30
 125         struct thread *cr_timer; // 5.6
 126
 127         /* packet thread and buffers */
 128         uint32_t packet_size;
 129         struct stream *ibuf;
 130         struct stream_fifo *obuf;
 131         struct thread *t_read;
 132         struct thread *t_write;
 133
 134         /* stats */
 135         uint32_t conn_attempts;
 136         uint32_t est_flaps;
 137         uint32_t sa_cnt; /* number of SAs attributed to this peer */
 138 #define PIM_MSDP_PEER_LAST_RESET_STR 20
 139         char last_reset[PIM_MSDP_PEER_LAST_RESET_STR];
 140
 141         /* packet stats */
 142         uint32_t ka_tx_cnt;
 143         uint32_t sa_tx_cnt;
 144         uint32_t ka_rx_cnt;
 145         uint32_t sa_rx_cnt;
 146         uint32_t unk_rx_cnt;
 147
 148         /* timestamps */
 149         int64_t uptime;
 150 };
 151
 152 struct pim_msdp_mg_mbr {
 153         struct in_addr mbr_ip;
 154         struct pim_msdp_peer *mp;
 155 };
 156
 157 /* PIM MSDP mesh-group */
 158 struct pim_msdp_mg {
 159         char *mesh_group_name;
 160         struct in_addr src_ip;
 161         uint32_t mbr_cnt;
 162         struct list *mbr_list;
 163 };
 164
 165 enum pim_msdp_flags {
 166         PIM_MSDPF_NONE = 0,
 167         PIM_MSDPF_ENABLE = (1 << 0),
 168         PIM_MSDPF_LISTENER = (1 << 1)
 169 };
 170
 171 struct pim_msdp_listener {
 172         int fd;
 173         union sockunion su;
 174         struct thread *thread;
 175 };
 176
 177 struct pim_msdp {
 178         enum pim_msdp_flags flags;
 179         struct thread_master *master;
 180         struct pim_msdp_listener listener;
 181         uint32_t rejected_accepts;
 182
 183         /* MSDP peer info */
 184         struct hash *peer_hash;
 185         struct list *peer_list;
 186
 187 /* MSDP active-source info */
 188 #define PIM_MSDP_SA_ADVERTISMENT_TIME 60
 189         struct thread *sa_adv_timer; // 5.6
 190         struct hash *sa_hash;
 191         struct list *sa_list;
 192         uint32_t local_cnt;
 193
 194         /* keep a scratch pad for building SA TLVs */
 195         struct stream *work_obuf;
 196
 197         struct in_addr originator_id;
 198
 199         /* currently only one mesh-group is supported - so just stash it here */
 200         struct pim_msdp_mg *mg;
 201 };
 202
 203 #define PIM_MSDP_PEER_READ_ON(mp)                                              \
 204         thread_add_read(mp->pim->msdp.master, pim_msdp_read, mp, mp->fd,       \
 205                         &mp->t_read)
 206
 207 #define PIM_MSDP_PEER_WRITE_ON(mp)                                             \
 208         thread_add_write(mp->pim->msdp.master, pim_msdp_write, mp, mp->fd,     \
 209                          &mp->t_write)
 210
 211 #define PIM_MSDP_PEER_READ_OFF(mp) THREAD_READ_OFF(mp->t_read)
 212 #define PIM_MSDP_PEER_WRITE_OFF(mp) THREAD_WRITE_OFF(mp->t_write)
 213
 214 // struct pim_msdp *msdp;
 215 struct pim_instance;
 216 void pim_msdp_init(struct pim_instance *pim, struct thread_master *master);
 217 void pim_msdp_exit(struct pim_instance *pim);
 218 enum pim_msdp_err pim_msdp_peer_add(struct pim_instance *pim,
 219                                     struct in_addr peer, struct in_addr local,
 220                                     const char *mesh_group_name,
 221                                     struct pim_msdp_peer **mp_p);
 222 enum pim_msdp_err pim_msdp_peer_del(struct pim_instance *pim,
 223                                     struct in_addr peer_addr);
 224 char *pim_msdp_state_dump(enum pim_msdp_peer_state state, char *buf,
 225                           int buf_size);
 226 struct pim_msdp_peer *pim_msdp_peer_find(struct pim_instance *pim,
 227                                          struct in_addr peer_addr);
 228 void pim_msdp_peer_established(struct pim_msdp_peer *mp);
 229 void pim_msdp_peer_pkt_rxed(struct pim_msdp_peer *mp);
 230 void pim_msdp_peer_stop_tcp_conn(struct pim_msdp_peer *mp, bool chg_state);
 231 void pim_msdp_peer_reset_tcp_conn(struct pim_msdp_peer *mp, const char *rc_str);
 232 int pim_msdp_write(struct thread *thread);
 233 char *pim_msdp_peer_key_dump(struct pim_msdp_peer *mp, char *buf, int buf_size,
 234                              bool long_format);
 235 int pim_msdp_config_write(struct vty *vty);
 236 int pim_msdp_config_write_helper(struct pim_instance *pim, struct vty *vty,
 237                                  const char *spaces);
 238 void pim_msdp_peer_pkt_txed(struct pim_msdp_peer *mp);
 239 void pim_msdp_sa_ref(struct pim_instance *pim, struct pim_msdp_peer *mp,
 240                      struct prefix_sg *sg, struct in_addr rp);
 241 void pim_msdp_sa_local_update(struct pim_upstream *up);
 242 void pim_msdp_sa_local_del(struct pim_instance *pim, struct prefix_sg *sg);
 243 void pim_msdp_i_am_rp_changed(struct pim_instance *pim);
 244 bool pim_msdp_peer_rpf_check(struct pim_msdp_peer *mp, struct in_addr rp);
 245 void pim_msdp_up_join_state_changed(struct pim_instance *pim,
 246                                     struct pim_upstream *xg_up);
 247 void pim_msdp_up_del(struct pim_instance *pim, struct prefix_sg *sg);
 248 enum pim_msdp_err pim_msdp_mg_mbr_add(struct pim_instance *pim,
 249                                       const char *mesh_group_name,
 250                                       struct in_addr mbr_ip);
 251 enum pim_msdp_err pim_msdp_mg_mbr_del(struct pim_instance *pim,
 252                                       const char *mesh_group_name,
 253                                       struct in_addr mbr_ip);
 254 enum pim_msdp_err pim_msdp_mg_src_del(struct pim_instance *pim,
 255                                       const char *mesh_group_name);
 256 enum pim_msdp_err pim_msdp_mg_src_add(struct pim_instance *pim,
 257                                       const char *mesh_group_name,
 258                                       struct in_addr src_ip);
 259 enum pim_msdp_err pim_msdp_mg_del(struct pim_instance *pim,
 260                                   const char *mesh_group_name);
 261 #endif