[mirror_frr.git] / pimd / pim_register.c

/*
 * PIM for Quagga
 * Copyright (C) 2015 Cumulus Networks, Inc.
 * Donald Sharp
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
 * MA 02110-1301 USA
 */

#include <zebra.h>

#include "log.h"
#include "if.h"
#include "thread.h"
#include "prefix.h"
#include "vty.h"
#include "plist.h"

#include "pimd.h"
#include "pim_mroute.h"
#include "pim_iface.h"
#include "pim_msg.h"
#include "pim_pim.h"
#include "pim_str.h"
#include "pim_rp.h"
#include "pim_register.h"
#include "pim_upstream.h"
#include "pim_br.h"
#include "pim_rpf.h"
#include "pim_oil.h"
#include "pim_zebra.h"
#include "pim_join.h"
#include "pim_util.h"
#include "pim_ssm.h"

struct thread *send_test_packet_timer = NULL;

void
pim_register_join (struct pim_upstream *up)
{
  if (pim_is_grp_ssm (up->sg.grp))
    {
      if (PIM_DEBUG_PIM_EVENTS)
	zlog_debug ("%s register setup skipped as group is SSM", up->sg_str);
      return;
    }

  pim_channel_add_oif (up->channel_oil, pim_regiface, PIM_OIF_FLAG_PROTO_PIM);
  up->reg_state = PIM_REG_JOIN;
}

void
pim_register_stop_send (struct interface *ifp, struct prefix_sg *sg,
			struct in_addr src, struct in_addr originator)
{
  struct pim_interface *pinfo;
  unsigned char buffer[10000];
  unsigned int b1length = 0;
  unsigned int length;
  uint8_t *b1;
  struct prefix p;

  if (PIM_DEBUG_PIM_REG)
    {
      zlog_debug ("Sending Register stop for %s to %s on %s",
		  pim_str_sg_dump (sg), inet_ntoa(originator), ifp->name);
    }

  memset (buffer, 0, 10000);
  b1 = (uint8_t *)buffer + PIM_MSG_REGISTER_STOP_LEN;

  length = pim_encode_addr_group (b1, AFI_IP, 0, 0, sg->grp);
  b1length += length;
  b1 += length;

  p.family = AF_INET;
  p.u.prefix4 = sg->src;
  p.prefixlen = 32;
  length = pim_encode_addr_ucast (b1, &p);
  b1length += length;

  pim_msg_build_header (buffer, b1length + PIM_MSG_REGISTER_STOP_LEN, PIM_MSG_TYPE_REG_STOP);

  pinfo = (struct pim_interface *)ifp->info;
  if (!pinfo)
    {
      if (PIM_DEBUG_PIM_TRACE)
        zlog_debug ("%s: No pinfo!\n", __PRETTY_FUNCTION__);
      return;
    }
  if (pim_msg_send (pinfo->pim_sock_fd, src, originator,
		    buffer, b1length + PIM_MSG_REGISTER_STOP_LEN,
		    ifp->name))
    {
      if (PIM_DEBUG_PIM_TRACE)
	{
	  zlog_debug ("%s: could not send PIM register stop message on interface %s",
		      __PRETTY_FUNCTION__, ifp->name);
	}
    }
  ++pinfo->pim_ifstat_reg_stop_send;
}

int
pim_register_stop_recv (uint8_t *buf, int buf_size)
{
  struct pim_upstream *upstream = NULL;
  struct prefix source;
  struct prefix_sg sg;
  int l;

  memset (&sg, 0, sizeof (struct prefix_sg));
  l = pim_parse_addr_group (&sg, buf, buf_size);
  buf += l;
  buf_size -= l;
  pim_parse_addr_ucast (&source, buf, buf_size);
  sg.src = source.u.prefix4;

  upstream = pim_upstream_find (&sg);
  if (!upstream)
    {
      return 0;
    }

  if (PIM_DEBUG_PIM_REG)
    zlog_debug ("Received Register stop for %s",
		upstream->sg_str);

  switch (upstream->reg_state)
    {
    case PIM_REG_NOINFO:
    case PIM_REG_PRUNE:
      return 0;
      break;
    case PIM_REG_JOIN:
      upstream->reg_state = PIM_REG_PRUNE;
      pim_channel_del_oif (upstream->channel_oil, pim_regiface, PIM_OIF_FLAG_PROTO_PIM);
      pim_upstream_start_register_stop_timer (upstream, 0);
      break;
    case PIM_REG_JOIN_PENDING:
      upstream->reg_state = PIM_REG_PRUNE;
      pim_upstream_start_register_stop_timer (upstream, 0);
      return 0;
      break;
    }

  return 0;
}

void
pim_register_send (const uint8_t *buf, int buf_size, struct in_addr src, struct pim_rpf *rpg, int null_register, struct pim_upstream *up)
{
  unsigned char buffer[10000];
  unsigned char *b1;
  struct pim_interface *pinfo;
  struct interface *ifp;

  if (PIM_DEBUG_PIM_REG)
    {
       zlog_debug ("Sending %s %sRegister Packet to %s",
		   up->sg_str, null_register ? "NULL " : "",
                   inet_ntoa (rpg->rpf_addr.u.prefix4));
    }

  ifp = rpg->source_nexthop.interface;
  if (!ifp)
    {
      if (PIM_DEBUG_PIM_REG)
        zlog_debug ("%s: No interface to transmit register on", __PRETTY_FUNCTION__);
      return;
    }
  pinfo = (struct pim_interface *)ifp->info;
  if (!pinfo) {
    if (PIM_DEBUG_PIM_REG)
      zlog_debug("%s: Interface: %s not configured for pim to trasmit on!\n", __PRETTY_FUNCTION__, ifp->name);
    return;
  }

  if (PIM_DEBUG_PIM_REG)
    {
      char rp_str[INET_ADDRSTRLEN];
      strncpy (rp_str, inet_ntoa (rpg->rpf_addr.u.prefix4), INET_ADDRSTRLEN-1);
      zlog_debug ("%s: Sending %s %sRegister Packet to %s on %s",
              __PRETTY_FUNCTION__, up->sg_str,
              null_register ? "NULL " : "", rp_str, ifp->name);
    }

  memset(buffer, 0, 10000);
  b1 = buffer + PIM_MSG_HEADER_LEN;
  *b1 |= null_register << 6;
  b1 = buffer + PIM_MSG_REGISTER_LEN;

  memcpy(b1, (const unsigned char *)buf, buf_size);

  pim_msg_build_header(buffer, buf_size + PIM_MSG_REGISTER_LEN, PIM_MSG_TYPE_REGISTER);

  ++pinfo->pim_ifstat_reg_send;

  if (pim_msg_send(pinfo->pim_sock_fd,
		   src,
		   rpg->rpf_addr.u.prefix4,
		   buffer,
		   buf_size + PIM_MSG_REGISTER_LEN,
		   ifp->name)) {
    if (PIM_DEBUG_PIM_TRACE) {
      zlog_debug("%s: could not send PIM register message on interface %s",
		 __PRETTY_FUNCTION__, ifp->name);
    }
    return;
  }
}

/*
 * 4.4.2 Receiving Register Messages at the RP
 *
 *   When an RP receives a Register message, the course of action is
 *  decided according to the following pseudocode:
 *
 *  packet_arrives_on_rp_tunnel( pkt ) {
 *      if( outer.dst is not one of my addresses ) {
 *          drop the packet silently.
 *          # Note: this may be a spoofing attempt
 *      }
 *      if( I_am_RP(G) AND outer.dst == RP(G) ) {
 *            sentRegisterStop = FALSE;
 *            if ( register.borderbit == TRUE ) {
 *                 if ( PMBR(S,G) == unknown ) {
 *                      PMBR(S,G) = outer.src
 *                 } else if ( outer.src != PMBR(S,G) ) {
 *                      send Register-Stop(S,G) to outer.src
 *                      drop the packet silently.
 *                 }
 *            }
 *            if ( SPTbit(S,G) OR
 *             ( SwitchToSptDesired(S,G) AND
 *               ( inherited_olist(S,G) == NULL ))) {
 *              send Register-Stop(S,G) to outer.src
 *              sentRegisterStop = TRUE;
 *            }
 *            if ( SPTbit(S,G) OR SwitchToSptDesired(S,G) ) {
 *                 if ( sentRegisterStop == TRUE ) {
 *                      set KeepaliveTimer(S,G) to RP_Keepalive_Period;
 *                 } else {
 *                      set KeepaliveTimer(S,G) to Keepalive_Period;
 *                 }
 *            }
 *            if( !SPTbit(S,G) AND ! pkt.NullRegisterBit ) {
 *                 decapsulate and forward the inner packet to
 *                 inherited_olist(S,G,rpt) # Note (+)
 *            }
 *      } else {
 *          send Register-Stop(S,G) to outer.src
 *          # Note (*)
 *      }
 *  }
 */
int
pim_register_recv (struct interface *ifp,
		   struct in_addr dest_addr,
		   struct in_addr src_addr,
		   uint8_t *tlv_buf, int tlv_buf_size)
{
  int sentRegisterStop = 0;
  struct ip *ip_hdr;
  struct prefix_sg sg;
  uint32_t *bits;
  int i_am_rp = 0;
  struct pim_interface *pim_ifp = NULL;

#define PIM_MSG_REGISTER_BIT_RESERVED_LEN 4
  ip_hdr = (struct ip *)(tlv_buf + PIM_MSG_REGISTER_BIT_RESERVED_LEN);

  if (!pim_rp_check_is_my_ip_address (ip_hdr->ip_dst, dest_addr)) {
    if (PIM_DEBUG_PIM_REG) {
      char dest[INET_ADDRSTRLEN];

      pim_inet4_dump ("<dst?>", dest_addr, dest, sizeof(dest));
      zlog_debug ("%s: Received Register message for %s that I do not own", __func__,
		  dest);
    }
    return 0;
  }

  pim_ifp = ifp->info;
  zassert(pim_ifp);
  ++pim_ifp->pim_ifstat_reg_recv;

  /*
   * Please note this is not drawn to get the correct bit/data size
   *
   * The entirety of the REGISTER packet looks like this:
   * -------------------------------------------------------------
   * | Ver  | Type | Reserved     |       Checksum               |
   * |-----------------------------------------------------------|
   * |B|N|     Reserved 2                                        |
   * |-----------------------------------------------------------|
   * | Encap  |                IP HDR                            |
   * | Mcast  |                                                  |
   * | Packet |--------------------------------------------------|
   * |        |               Mcast Data                         |
   * |        |                                                  |
   * ...
   *
   * tlv_buf when received from the caller points at the B bit
   * We need to know the inner source and dest
   */
  bits = (uint32_t *)tlv_buf;

  /*
   * tlv_buf points to the start of the |B|N|... Reserved
   * Line above.  So we need to add 4 bytes to get to the
   * start of the actual Encapsulated data.
   */
  memset (&sg, 0, sizeof (struct prefix_sg));
  sg.src = ip_hdr->ip_src;
  sg.grp = ip_hdr->ip_dst;

  i_am_rp = I_am_RP (sg.grp);

  if (PIM_DEBUG_PIM_REG)
    {
      char src_str[INET_ADDRSTRLEN];

      pim_inet4_dump ("<src?>", src_addr, src_str, sizeof (src_str));
      zlog_debug ("Received Register message(%s) from %s on %s, rp: %d",
                  pim_str_sg_dump (&sg), src_str, ifp->name, i_am_rp);
    }

  if (i_am_rp && (dest_addr.s_addr == ((RP (sg.grp))->rpf_addr.u.prefix4.s_addr))) {
    sentRegisterStop = 0;

    if (*bits & PIM_REGISTER_BORDER_BIT) {
      struct in_addr pimbr = pim_br_get_pmbr (&sg);
      if (PIM_DEBUG_PIM_PACKETS)
	zlog_debug("%s: Received Register message with Border bit set", __func__);

      if (pimbr.s_addr == pim_br_unknown.s_addr)
	pim_br_set_pmbr(&sg, src_addr);
      else if (src_addr.s_addr != pimbr.s_addr) {
	pim_register_stop_send (ifp, &sg, dest_addr, src_addr);
	if (PIM_DEBUG_PIM_PACKETS)
	  zlog_debug("%s: Sending register-Stop to %s and dropping mr. packet",
	    __func__, "Sender");
	/* Drop Packet Silently */
	return 1;
      }
    }

    struct pim_upstream *upstream = pim_upstream_find (&sg);
    /*
     * If we don't have a place to send ignore the packet
     */
    if (!upstream)
      {
        upstream = pim_upstream_add (&sg, ifp,
                                     PIM_UPSTREAM_FLAG_MASK_SRC_STREAM,
                                     __PRETTY_FUNCTION__);
        if (!upstream)
          {
            zlog_warn ("Failure to create upstream state");
            return 1;
          }

        upstream->upstream_register = src_addr;
      }

    if ((upstream->sptbit == PIM_UPSTREAM_SPTBIT_TRUE) ||
	((SwitchToSptDesired(&sg)) &&
	 pim_upstream_inherited_olist (upstream) == 0)) {
      //pim_scan_individual_oil (upstream->channel_oil);
      pim_register_stop_send (ifp, &sg, dest_addr, src_addr);
      sentRegisterStop = 1;
    } else {
      if (PIM_DEBUG_PIM_REG)
         zlog_debug ("(%s) sptbit: %d", upstream->sg_str, upstream->sptbit);
    }
    if ((upstream->sptbit == PIM_UPSTREAM_SPTBIT_TRUE) ||
	(SwitchToSptDesired(&sg))) {
      if (sentRegisterStop) {
	pim_upstream_keep_alive_timer_start (upstream, qpim_rp_keep_alive_time);
      } else {
	pim_upstream_keep_alive_timer_start (upstream, qpim_keep_alive_time);
      }
    }

    if (!(upstream->sptbit == PIM_UPSTREAM_SPTBIT_TRUE) &&
	!(*bits & PIM_REGISTER_NR_BIT))
      {
	//decapsulate and forward the iner packet to
	//inherited_olist(S,G,rpt)
	// This is taken care of by the kernel for us
      }
     pim_upstream_msdp_reg_timer_start(upstream);
  } else {
    if (PIM_DEBUG_PIM_REG)
      {
	if (!i_am_rp)
	  zlog_debug ("Received Register packet for %s, Rejecting packet because I am not the RP configured for group",
		      pim_str_sg_dump (&sg));
	else
	  zlog_debug ("Received Register packet for %s, Rejecting packet because the dst ip address is not the actual RP",
		      pim_str_sg_dump (&sg));
      }
    pim_register_stop_send (ifp, &sg, dest_addr, src_addr);
  }

  return 1;
}
Commit	Line	Data
01d68c9b DS	1	/*
	2	* PIM for Quagga
	3	* Copyright (C) 2015 Cumulus Networks, Inc.
	4	* Donald Sharp
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; see the file COPYING; if not, write to the
	18	* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
	19	* MA 02110-1301 USA
	20	*/
	21
	22	#include <zebra.h>
	23
	24	#include "log.h"
	25	#include "if.h"
	26	#include "thread.h"
13c2408c	27	#include "prefix.h"
dfe43e25 DW	28	#include "vty.h"
dfe43e25 DW	29	#include "plist.h"
01d68c9b DS	30
01d68c9b DS	31	#include "pimd.h"
998af219 DS	32	#include "pim_mroute.h"
	33	#include "pim_iface.h"
	34	#include "pim_msg.h"
	35	#include "pim_pim.h"
01d68c9b DS	36	#include "pim_str.h"
	37	#include "pim_rp.h"
	38	#include "pim_register.h"
80c0d168	39	#include "pim_upstream.h"
01d68c9b	40	#include "pim_br.h"
2ca35b3d DS	41	#include "pim_rpf.h"
	42	#include "pim_oil.h"
	43	#include "pim_zebra.h"
	44	#include "pim_join.h"
13c2408c	45	#include "pim_util.h"
15a5dafe	46	#include "pim_ssm.h"
01d68c9b DS	47
	48	struct thread *send_test_packet_timer = NULL;
	49
15a5dafe	50	void
	51	pim_register_join (struct pim_upstream *up)
	52	{
	53	if (pim_is_grp_ssm (up->sg.grp))
	54	{
	55	if (PIM_DEBUG_PIM_EVENTS)
	56	zlog_debug ("%s register setup skipped as group is SSM", up->sg_str);
19f4e33a	57	return;
15a5dafe	58	}
	59
	60	pim_channel_add_oif (up->channel_oil, pim_regiface, PIM_OIF_FLAG_PROTO_PIM);
	61	up->reg_state = PIM_REG_JOIN;
	62	}
	63
8e38a2cf	64	void
4ed0af70	65	pim_register_stop_send (struct interface ifp, struct prefix_sg sg,
4df01a4e	66	struct in_addr src, struct in_addr originator)
01d68c9b	67	{
13c2408c	68	struct pim_interface *pinfo;
19e55095	69	unsigned char buffer[10000];
13c2408c DS	70	unsigned int b1length = 0;
	71	unsigned int length;
	72	uint8_t *b1;
	73	struct prefix p;
	74
9add3b88 DS	75	if (PIM_DEBUG_PIM_REG)
	76	{
	77	zlog_debug ("Sending Register stop for %s to %s on %s",
	78	pim_str_sg_dump (sg), inet_ntoa(originator), ifp->name);
	79	}
	80
19e55095	81	memset (buffer, 0, 10000);
13c2408c DS	82	b1 = (uint8_t *)buffer + PIM_MSG_REGISTER_STOP_LEN;
13c2408c DS	83
4ed0af70	84	length = pim_encode_addr_group (b1, AFI_IP, 0, 0, sg->grp);
13c2408c DS	85	b1length += length;
	86	b1 += length;
	87
	88	p.family = AF_INET;
4ed0af70	89	p.u.prefix4 = sg->src;
13c2408c DS	90	p.prefixlen = 32;
	91	length = pim_encode_addr_ucast (b1, &p);
	92	b1length += length;
	93
	94	pim_msg_build_header (buffer, b1length + PIM_MSG_REGISTER_STOP_LEN, PIM_MSG_TYPE_REG_STOP);
	95
	96	pinfo = (struct pim_interface *)ifp->info;
	97	if (!pinfo)
	98	{
	99	if (PIM_DEBUG_PIM_TRACE)
	100	zlog_debug ("%s: No pinfo!\n", __PRETTY_FUNCTION__);
	101	return;
	102	}
4df01a4e	103	if (pim_msg_send (pinfo->pim_sock_fd, src, originator,
13c2408c DS	104	buffer, b1length + PIM_MSG_REGISTER_STOP_LEN,
	105	ifp->name))
	106	{
	107	if (PIM_DEBUG_PIM_TRACE)
	108	{
	109	zlog_debug ("%s: could not send PIM register stop message on interface %s",
	110	__PRETTY_FUNCTION__, ifp->name);
	111	}
	112	}
39438188	113	++pinfo->pim_ifstat_reg_stop_send;
01d68c9b DS	114	}
01d68c9b DS	115
4dffc880	116	int
56638739	117	pim_register_stop_recv (uint8_t *buf, int buf_size)
4dffc880	118	{
56638739 DS	119	struct pim_upstream *upstream = NULL;
56638739 DS	120	struct prefix source;
4ed0af70	121	struct prefix_sg sg;
56638739 DS	122	int l;
56638739 DS	123
53e39e14	124	memset (&sg, 0, sizeof (struct prefix_sg));
bce0e645	125	l = pim_parse_addr_group (&sg, buf, buf_size);
56638739 DS	126	buf += l;
56638739 DS	127	buf_size -= l;
a878ba45	128	pim_parse_addr_ucast (&source, buf, buf_size);
4ed0af70	129	sg.src = source.u.prefix4;
9add3b88	130
5074a423	131	upstream = pim_upstream_find (&sg);
56638739 DS	132	if (!upstream)
	133	{
	134	return 0;
	135	}
	136
8bfb8b67 DS	137	if (PIM_DEBUG_PIM_REG)
	138	zlog_debug ("Received Register stop for %s",
	139	upstream->sg_str);
	140
e0e127b0	141	switch (upstream->reg_state)
56638739	142	{
0c2ebf00	143	case PIM_REG_NOINFO:
0c2ebf00	144	case PIM_REG_PRUNE:
56638739 DS	145	return 0;
56638739 DS	146	break;
0c2ebf00	147	case PIM_REG_JOIN:
0c2ebf00	148	upstream->reg_state = PIM_REG_PRUNE;
bb027ee8 DS	149	pim_channel_del_oif (upstream->channel_oil, pim_regiface, PIM_OIF_FLAG_PROTO_PIM);
bb027ee8 DS	150	pim_upstream_start_register_stop_timer (upstream, 0);
35661ffa	151	break;
0c2ebf00	152	case PIM_REG_JOIN_PENDING:
0c2ebf00	153	upstream->reg_state = PIM_REG_PRUNE;
56638739	154	pim_upstream_start_register_stop_timer (upstream, 0);
56638739 DS	155	return 0;
	156	break;
	157	}
	158
4dffc880 DS	159	return 0;
	160	}
	161
998af219	162	void
0e3b3d5d	163	pim_register_send (const uint8_t buf, int buf_size, struct in_addr src, struct pim_rpf rpg, int null_register, struct pim_upstream *up)
998af219	164	{
19e55095	165	unsigned char buffer[10000];
998af219 DS	166	unsigned char *b1;
	167	struct pim_interface *pinfo;
	168	struct interface *ifp;
998af219	169
9add3b88 DS	170	if (PIM_DEBUG_PIM_REG)
9add3b88 DS	171	{
0e3b3d5d	172	zlog_debug ("Sending %s %sRegister Packet to %s",
35661ffa DS	173	up->sg_str, null_register ? "NULL " : "",
35661ffa DS	174	inet_ntoa (rpg->rpf_addr.u.prefix4));
9add3b88 DS	175	}
9add3b88 DS	176
998af219	177	ifp = rpg->source_nexthop.interface;
63b8f7a3 DS	178	if (!ifp)
	179	{
	180	if (PIM_DEBUG_PIM_REG)
	181	zlog_debug ("%s: No interface to transmit register on", __PRETTY_FUNCTION__);
	182	return;
	183	}
998af219 DS	184	pinfo = (struct pim_interface *)ifp->info;
998af219 DS	185	if (!pinfo) {
63b8f7a3 DS	186	if (PIM_DEBUG_PIM_REG)
63b8f7a3 DS	187	zlog_debug("%s: Interface: %s not configured for pim to trasmit on!\n", __PRETTY_FUNCTION__, ifp->name);
998af219 DS	188	return;
	189	}
	190
633988a7 CS	191	if (PIM_DEBUG_PIM_REG)
	192	{
	193	char rp_str[INET_ADDRSTRLEN];
36b1fa86	194	strncpy (rp_str, inet_ntoa (rpg->rpf_addr.u.prefix4), INET_ADDRSTRLEN-1);
633988a7 CS	195	zlog_debug ("%s: Sending %s %sRegister Packet to %s on %s",
	196	__PRETTY_FUNCTION__, up->sg_str,
	197	null_register ? "NULL " : "", rp_str, ifp->name);
	198	}
	199
19e55095	200	memset(buffer, 0, 10000);
b100a4f5	201	b1 = buffer + PIM_MSG_HEADER_LEN;
dc686f82	202	*b1 \|= null_register << 6;
998af219 DS	203	b1 = buffer + PIM_MSG_REGISTER_LEN;
998af219 DS	204
b100a4f5	205	memcpy(b1, (const unsigned char *)buf, buf_size);
998af219	206
b100a4f5	207	pim_msg_build_header(buffer, buf_size + PIM_MSG_REGISTER_LEN, PIM_MSG_TYPE_REGISTER);
998af219	208
39438188 CS	209	++pinfo->pim_ifstat_reg_send;
39438188 CS	210
998af219	211	if (pim_msg_send(pinfo->pim_sock_fd,
4df01a4e	212	src,
63c59d0c	213	rpg->rpf_addr.u.prefix4,
998af219	214	buffer,
b100a4f5	215	buf_size + PIM_MSG_REGISTER_LEN,
998af219 DS	216	ifp->name)) {
	217	if (PIM_DEBUG_PIM_TRACE) {
	218	zlog_debug("%s: could not send PIM register message on interface %s",
	219	__PRETTY_FUNCTION__, ifp->name);
	220	}
	221	return;
	222	}
	223	}
	224
01d68c9b DS	225	/*
	226	* 4.4.2 Receiving Register Messages at the RP
	227	*
	228	* When an RP receives a Register message, the course of action is
	229	* decided according to the following pseudocode:
	230	*
	231	* packet_arrives_on_rp_tunnel( pkt ) {
	232	* if( outer.dst is not one of my addresses ) {
	233	* drop the packet silently.
	234	* # Note: this may be a spoofing attempt
	235	* }
	236	* if( I_am_RP(G) AND outer.dst == RP(G) ) {
	237	* sentRegisterStop = FALSE;
	238	* if ( register.borderbit == TRUE ) {
	239	* if ( PMBR(S,G) == unknown ) {
	240	* PMBR(S,G) = outer.src
	241	* } else if ( outer.src != PMBR(S,G) ) {
	242	* send Register-Stop(S,G) to outer.src
	243	* drop the packet silently.
	244	* }
	245	* }
	246	* if ( SPTbit(S,G) OR
	247	* ( SwitchToSptDesired(S,G) AND
	248	* ( inherited_olist(S,G) == NULL ))) {
	249	* send Register-Stop(S,G) to outer.src
	250	* sentRegisterStop = TRUE;
	251	* }
	252	* if ( SPTbit(S,G) OR SwitchToSptDesired(S,G) ) {
	253	* if ( sentRegisterStop == TRUE ) {
	254	* set KeepaliveTimer(S,G) to RP_Keepalive_Period;
	255	* } else {
	256	* set KeepaliveTimer(S,G) to Keepalive_Period;
	257	* }
	258	* }
	259	* if( !SPTbit(S,G) AND ! pkt.NullRegisterBit ) {
	260	* decapsulate and forward the inner packet to
	261	* inherited_olist(S,G,rpt) # Note (+)
	262	* }
	263	* } else {
	264	* send Register-Stop(S,G) to outer.src
	265	* # Note (*)
	266	* }
	267	* }
	268	*/
	269	int
	270	pim_register_recv (struct interface *ifp,
	271	struct in_addr dest_addr,
	272	struct in_addr src_addr,
	273	uint8_t *tlv_buf, int tlv_buf_size)
	274	{
77e390e5 DS	275	int sentRegisterStop = 0;
77e390e5 DS	276	struct ip *ip_hdr;
4ed0af70	277	struct prefix_sg sg;
77e390e5	278	uint32_t *bits;
a6dc7de6	279	int i_am_rp = 0;
39438188	280	struct pim_interface *pim_ifp = NULL;
01d68c9b	281
75a26779 DS	282	#define PIM_MSG_REGISTER_BIT_RESERVED_LEN 4
	283	ip_hdr = (struct ip *)(tlv_buf + PIM_MSG_REGISTER_BIT_RESERVED_LEN);
	284
	285	if (!pim_rp_check_is_my_ip_address (ip_hdr->ip_dst, dest_addr)) {
d41b415c	286	if (PIM_DEBUG_PIM_REG) {
eaa54bdb	287	char dest[INET_ADDRSTRLEN];
01d68c9b DS	288
	289	pim_inet4_dump ("<dst?>", dest_addr, dest, sizeof(dest));
	290	zlog_debug ("%s: Received Register message for %s that I do not own", __func__,
	291	dest);
	292	}
	293	return 0;
	294	}
	295
39438188 CS	296	pim_ifp = ifp->info;
	297	zassert(pim_ifp);
	298	++pim_ifp->pim_ifstat_reg_recv;
	299
77e390e5 DS	300	/*
	301	* Please note this is not drawn to get the correct bit/data size
	302	*
	303	* The entirety of the REGISTER packet looks like this:
	304	* -------------------------------------------------------------
	305	* \| Ver \| Type \| Reserved \| Checksum \|
	306	* \|-----------------------------------------------------------\|
	307	* \|B\|N\| Reserved 2 \|
	308	* \|-----------------------------------------------------------\|
	309	* \| Encap \| IP HDR \|
	310	* \| Mcast \| \|
	311	* \| Packet \|--------------------------------------------------\|
	312	* \| \| Mcast Data \|
	313	* \| \| \|
	314	* ...
	315	*
	316	* tlv_buf when received from the caller points at the B bit
	317	* We need to know the inner source and dest
	318	*/
	319	bits = (uint32_t *)tlv_buf;
83d8ff00 DS	320
	321	/*
	322	* tlv_buf points to the start of the \|B\|N\|... Reserved
	323	* Line above. So we need to add 4 bytes to get to the
	324	* start of the actual Encapsulated data.
	325	*/
4ed0af70 DS	326	memset (&sg, 0, sizeof (struct prefix_sg));
	327	sg.src = ip_hdr->ip_src;
	328	sg.grp = ip_hdr->ip_dst;
77e390e5	329
a6dc7de6	330	i_am_rp = I_am_RP (sg.grp);
5d84a3bc DS	331
	332	if (PIM_DEBUG_PIM_REG)
	333	{
	334	char src_str[INET_ADDRSTRLEN];
	335
	336	pim_inet4_dump ("<src?>", src_addr, src_str, sizeof (src_str));
	337	zlog_debug ("Received Register message(%s) from %s on %s, rp: %d",
	338	pim_str_sg_dump (&sg), src_str, ifp->name, i_am_rp);
	339	}
	340
a6dc7de6	341	if (i_am_rp && (dest_addr.s_addr == ((RP (sg.grp))->rpf_addr.u.prefix4.s_addr))) {
77e390e5	342	sentRegisterStop = 0;
01d68c9b	343
9eda95bd	344	if (*bits & PIM_REGISTER_BORDER_BIT) {
65e1fcd7	345	struct in_addr pimbr = pim_br_get_pmbr (&sg);
01d68c9b DS	346	if (PIM_DEBUG_PIM_PACKETS)
	347	zlog_debug("%s: Received Register message with Border bit set", __func__);
	348
	349	if (pimbr.s_addr == pim_br_unknown.s_addr)
65e1fcd7	350	pim_br_set_pmbr(&sg, src_addr);
80c0d168	351	else if (src_addr.s_addr != pimbr.s_addr) {
4df01a4e	352	pim_register_stop_send (ifp, &sg, dest_addr, src_addr);
01d68c9b DS	353	if (PIM_DEBUG_PIM_PACKETS)
	354	zlog_debug("%s: Sending register-Stop to %s and dropping mr. packet",
	355	__func__, "Sender");
77e390e5 DS	356	/* Drop Packet Silently */
77e390e5 DS	357	return 1;
01d68c9b DS	358	}
01d68c9b DS	359	}
77e390e5	360
5074a423	361	struct pim_upstream *upstream = pim_upstream_find (&sg);
77e390e5 DS	362	/*
	363	* If we don't have a place to send ignore the packet
	364	*/
	365	if (!upstream)
9fd309db	366	{
4a57e76a DS	367	upstream = pim_upstream_add (&sg, ifp,
	368	PIM_UPSTREAM_FLAG_MASK_SRC_STREAM,
	369	__PRETTY_FUNCTION__);
4e85d209 DS	370	if (!upstream)
4e85d209 DS	371	{
63b8f7a3	372	zlog_warn ("Failure to create upstream state");
4e85d209 DS	373	return 1;
4e85d209 DS	374	}
5ce79466	375
8e38a2cf	376	upstream->upstream_register = src_addr;
9fd309db DS	377	}
9fd309db DS	378
77e390e5	379	if ((upstream->sptbit == PIM_UPSTREAM_SPTBIT_TRUE) \|\|
ad410c6c	380	((SwitchToSptDesired(&sg)) &&
4fdc8f36	381	pim_upstream_inherited_olist (upstream) == 0)) {
216bb84f	382	//pim_scan_individual_oil (upstream->channel_oil);
4df01a4e	383	pim_register_stop_send (ifp, &sg, dest_addr, src_addr);
77e390e5	384	sentRegisterStop = 1;
5d84a3bc DS	385	} else {
5d84a3bc DS	386	if (PIM_DEBUG_PIM_REG)
8bfb8b67	387	zlog_debug ("(%s) sptbit: %d", upstream->sg_str, upstream->sptbit);
77e390e5	388	}
77e390e5	389	if ((upstream->sptbit == PIM_UPSTREAM_SPTBIT_TRUE) \|\|
ad410c6c	390	(SwitchToSptDesired(&sg))) {
80c0d168	391	if (sentRegisterStop) {
01408ede	392	pim_upstream_keep_alive_timer_start (upstream, qpim_rp_keep_alive_time);
77e390e5	393	} else {
4304f95c	394	pim_upstream_keep_alive_timer_start (upstream, qpim_keep_alive_time);
77e390e5 DS	395	}
	396	}
	397
	398	if (!(upstream->sptbit == PIM_UPSTREAM_SPTBIT_TRUE) &&
2ca35b3d DS	399	!(*bits & PIM_REGISTER_NR_BIT))
2ca35b3d DS	400	{
2ca35b3d DS	401	//decapsulate and forward the iner packet to
2ca35b3d DS	402	//inherited_olist(S,G,rpt)
0365f56b	403	// This is taken care of by the kernel for us
2ca35b3d	404	}
1bf16443	405	pim_upstream_msdp_reg_timer_start(upstream);
77e390e5	406	} else {
a6dc7de6 DS	407	if (PIM_DEBUG_PIM_REG)
	408	{
	409	if (!i_am_rp)
	410	zlog_debug ("Received Register packet for %s, Rejecting packet because I am not the RP configured for group",
	411	pim_str_sg_dump (&sg));
	412	else
	413	zlog_debug ("Received Register packet for %s, Rejecting packet because the dst ip address is not the actual RP",
	414	pim_str_sg_dump (&sg));
	415	}
4df01a4e	416	pim_register_stop_send (ifp, &sg, dest_addr, src_addr);
77e390e5	417	}
01d68c9b DS	418
	419	return 1;
	420	}