X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Flwip%2Fcore%2Fipv4%2Figmp.c;fp=palacios%2Fsrc%2Flwip%2Fcore%2Fipv4%2Figmp.c;h=0000000000000000000000000000000000000000;hb=d38e1d6edeee83bfb1e3e3c6e2367faa5055bdfe;hp=fb54cc9a3173c12fb8e0bc21d6b1e1b4092b7e53;hpb=e70e95962c26832628d586e07f9cd1a2e1852d72;p=palacios.git diff --git a/palacios/src/lwip/core/ipv4/igmp.c b/palacios/src/lwip/core/ipv4/igmp.c deleted file mode 100644 index fb54cc9..0000000 --- a/palacios/src/lwip/core/ipv4/igmp.c +++ /dev/null @@ -1,808 +0,0 @@ -/** - * @file - * IGMP - Internet Group Management Protocol - * - */ - -/* - * Copyright (c) 2002 CITEL Technologies Ltd. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS'' - * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * This file is a contribution to the lwIP TCP/IP stack. - * The Swedish Institute of Computer Science and Adam Dunkels - * are specifically granted permission to redistribute this - * source code. -*/ - -/*------------------------------------------------------------- -Note 1) -Although the rfc requires V1 AND V2 capability -we will only support v2 since now V1 is very old (August 1989) -V1 can be added if required - -a debug print and statistic have been implemented to -show this up. -------------------------------------------------------------- -------------------------------------------------------------- -Note 2) -A query for a specific group address (as opposed to ALLHOSTS) -has now been implemented as I am unsure if it is required - -a debug print and statistic have been implemented to -show this up. -------------------------------------------------------------- -------------------------------------------------------------- -Note 3) -The router alert rfc 2113 is implemented in outgoing packets -but not checked rigorously incoming -------------------------------------------------------------- -Steve Reynolds -------------------------------------------------------------*/ - -/*----------------------------------------------------------------------------- - * RFC 988 - Host extensions for IP multicasting - V0 - * RFC 1054 - Host extensions for IP multicasting - - * RFC 1112 - Host extensions for IP multicasting - V1 - * RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard) - * RFC 3376 - Internet Group Management Protocol, Version 3 - V3 - * RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+ - * RFC 2113 - IP Router Alert Option - - *----------------------------------------------------------------------------*/ - -/*----------------------------------------------------------------------------- - * Includes - *----------------------------------------------------------------------------*/ - -#include "lwip/opt.h" - -#if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */ - -#include "lwip/igmp.h" -#include "lwip/debug.h" -#include "lwip/def.h" -#include "lwip/mem.h" -#include "lwip/ip.h" -#include "lwip/inet.h" -#include "lwip/inet_chksum.h" -#include "lwip/netif.h" -#include "lwip/icmp.h" -#include "lwip/udp.h" -#include "lwip/tcp.h" -#include "lwip/stats.h" - -#include "string.h" - -/*----------------------------------------------------------------------------- - * Globales - *----------------------------------------------------------------------------*/ - -static struct igmp_group* igmp_group_list; -static struct ip_addr allsystems; -static struct ip_addr allrouters; - -/** - * Initialize the IGMP module - */ -void -igmp_init(void) -{ - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n")); - - IP4_ADDR(&allsystems, 224, 0, 0, 1); - IP4_ADDR(&allrouters, 224, 0, 0, 2); -} - -#ifdef LWIP_DEBUG -/** - * Dump global IGMP groups list - */ -void -igmp_dump_group_list() -{ - struct igmp_group *group = igmp_group_list; - - while (group != NULL) { - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state))); - ip_addr_debug_print(IGMP_DEBUG, &group->group_address); - LWIP_DEBUGF(IGMP_DEBUG, (" on if %x\n", (int) group->interface)); - group = group->next; - } - LWIP_DEBUGF(IGMP_DEBUG, ("\n")); -} -#else -#define igmp_dump_group_list() -#endif /* LWIP_DEBUG */ - -/** - * Start IGMP processing on interface - * - * @param netif network interface on which start IGMP processing - */ -err_t -igmp_start(struct netif *netif) -{ - struct igmp_group* group; - - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %x\n", (int) netif)); - - group = igmp_lookup_group(netif, &allsystems); - - if (group != NULL) { - group->group_state = IGMP_GROUP_IDLE_MEMBER; - group->use++; - - /* Allow the igmp messages at the MAC level */ - if (netif->igmp_mac_filter != NULL) { - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD ")); - ip_addr_debug_print(IGMP_DEBUG, &allsystems); - LWIP_DEBUGF(IGMP_DEBUG, (") on if %x\n", (int) netif)); - netif->igmp_mac_filter( netif, &allsystems, IGMP_ADD_MAC_FILTER); - } - - return ERR_OK; - } - - return ERR_MEM; -} - -/** - * Stop IGMP processing on interface - * - * @param netif network interface on which stop IGMP processing - */ -err_t -igmp_stop(struct netif *netif) -{ - struct igmp_group *group = igmp_group_list; - struct igmp_group *prev = NULL; - struct igmp_group *next; - - /* look for groups joined on this interface further down the list */ - while (group != NULL) { - next = group->next; - /* is it a group joined on this interface? */ - if (group->interface == netif) { - /* is it the first group of the list? */ - if (group == igmp_group_list) { - igmp_group_list = next; - } - /* is there a "previous" group defined? */ - if (prev != NULL) { - prev->next = next; - } - /* disable the group at the MAC level */ - if (netif->igmp_mac_filter != NULL) { - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL ")); - ip_addr_debug_print(IGMP_DEBUG, &group->group_address); - LWIP_DEBUGF(IGMP_DEBUG, (") on if %x\n", (int) netif)); - netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER); - } - /* free group */ - memp_free(MEMP_IGMP_GROUP, group); - } else { - /* change the "previous" */ - prev = group; - } - /* move to "next" */ - group = next; - } - return ERR_OK; -} - -/** - * Report IGMP memberships for this interface - * - * @param netif network interface on which report IGMP memberships - */ -void -igmp_report_groups( struct netif *netif) -{ - struct igmp_group *group = igmp_group_list; - - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %x\n", (int) netif)); - - while (group != NULL) { - if (group->interface == netif) { - igmp_delaying_member( group, IGMP_JOIN_DELAYING_MEMBER_TMR); - } - group = group->next; - } -} - -/** - * Search for a group in the global igmp_group_list - * - * @param ifp the network interface for which to look - * @param addr the group ip address to search for - * @return a struct igmp_group* if the group has been found, - * NULL if the group wasn't found. - */ -struct igmp_group * -igmp_lookfor_group(struct netif *ifp, struct ip_addr *addr) -{ - struct igmp_group *group = igmp_group_list; - - while (group != NULL) { - if ((group->interface == ifp) && (ip_addr_cmp(&(group->group_address), addr))) { - return group; - } - group = group->next; - } - - /* to be clearer, we return NULL here instead of - * 'group' (which is also NULL at this point). - */ - return NULL; -} - -/** - * Search for a specific igmp group and create a new one if not found- - * - * @param ifp the network interface for which to look - * @param addr the group ip address to search - * @return a struct igmp_group*, - * NULL on memory error. - */ -struct igmp_group * -igmp_lookup_group(struct netif *ifp, struct ip_addr *addr) -{ - struct igmp_group *group = igmp_group_list; - - /* Search if the group already exists */ - group = igmp_lookfor_group(ifp, addr); - if (group != NULL) { - /* Group already exists. */ - return group; - } - - /* Group doesn't exist yet, create a new one */ - group = memp_malloc(MEMP_IGMP_GROUP); - if (group != NULL) { - group->interface = ifp; - ip_addr_set(&(group->group_address), addr); - group->timer = 0; /* Not running */ - group->group_state = IGMP_GROUP_NON_MEMBER; - group->last_reporter_flag = 0; - group->use = 0; - group->next = igmp_group_list; - - igmp_group_list = group; - } - - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to "))); - ip_addr_debug_print(IGMP_DEBUG, addr); - LWIP_DEBUGF(IGMP_DEBUG, (" on if %x\n", (int) ifp)); - - return group; -} - -/** - * Remove a group in the global igmp_group_list - * - * @param group the group to remove from the global igmp_group_list - * @return ERR_OK if group was removed from the list, an err_t otherwise - */ -err_t -igmp_remove_group(struct igmp_group *group) -{ - err_t err = ERR_OK; - - /* Is it the first group? */ - if (igmp_group_list == group) { - igmp_group_list = group->next; - } else { - /* look for group further down the list */ - struct igmp_group *tmpGroup; - for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) { - if (tmpGroup->next == group) { - tmpGroup->next = group->next; - break; - } - } - /* Group not found in the global igmp_group_list */ - if (tmpGroup == NULL) - err = ERR_ARG; - } - /* free group */ - memp_free(MEMP_IGMP_GROUP, group); - - return err; -} - -/** - * Called from ip_input() if a new IGMP packet is received. - * - * @param p received igmp packet, p->payload pointing to the ip header - * @param inp network interface on which the packet was received - * @param dest destination ip address of the igmp packet - */ -void -igmp_input(struct pbuf *p, struct netif *inp, struct ip_addr *dest) -{ - struct ip_hdr * iphdr; - struct igmp_msg* igmp; - struct igmp_group* group; - struct igmp_group* groupref; - - /* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */ - iphdr = p->payload; - if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) || (p->len < IGMP_MINLEN)) { - pbuf_free(p); - IGMP_STATS_INC(igmp.lenerr); - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n")); - return; - } - - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from ")); - ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src)); - LWIP_DEBUGF(IGMP_DEBUG, (" to address ")); - ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest)); - LWIP_DEBUGF(IGMP_DEBUG, (" on if %x\n", (int) inp)); - - /* Now calculate and check the checksum */ - igmp = (struct igmp_msg *)p->payload; - if (inet_chksum(igmp, p->len)) { - pbuf_free(p); - IGMP_STATS_INC(igmp.chkerr); - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n")); - return; - } - - /* Packet is ok so find an existing group */ - group = igmp_lookfor_group(inp, dest); /* use the incoming IP address! */ - - /* If group can be found or create... */ - if (!group) { - pbuf_free(p); - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n")); - return; - } - - /* NOW ACT ON THE INCOMING MESSAGE TYPE... */ - switch (igmp->igmp_msgtype) { - case IGMP_MEMB_QUERY: { - /* IGMP_MEMB_QUERY to the "all systems" address ? */ - if ((ip_addr_cmp(dest, &allsystems)) && (igmp->igmp_group_address.addr == 0)) { - /* THIS IS THE GENERAL QUERY */ - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: General IGMP_MEMB_QUERY on \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp))); - - if (igmp->igmp_maxresp == 0) { - IGMP_STATS_INC(igmp.v1_rxed); - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n")); - igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR; - } - - IGMP_STATS_INC(igmp.group_query_rxed); - groupref = igmp_group_list; - while (groupref) { - /* Do not send messages on the all systems group address! */ - if ((groupref->interface == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) { - igmp_delaying_member( groupref, igmp->igmp_maxresp); - } - groupref = groupref->next; - } - } else { - /* IGMP_MEMB_QUERY to a specific group ? */ - if (group->group_address.addr != 0) { - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group ")); - ip_addr_debug_print(IGMP_DEBUG, &group->group_address); - if (ip_addr_cmp (dest, &allsystems)) { - LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp))); - /* we first need to re-lookfor the group since we used dest last time */ - group = igmp_lookfor_group(inp, &igmp->igmp_group_address); - } else { - LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp))); - } - - if (group != NULL) { - IGMP_STATS_INC(igmp.unicast_query); - igmp_delaying_member( group, igmp->igmp_maxresp); - } - } - } - break; - } - case IGMP_V2_MEMB_REPORT: { - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n")); - - IGMP_STATS_INC(igmp.report_rxed); - if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) { - /* This is on a specific group we have already looked up */ - group->timer = 0; /* stopped */ - group->group_state = IGMP_GROUP_IDLE_MEMBER; - group->last_reporter_flag = 0; - } - break; - } - default: { - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %x in state %x on group %x on if %x\n", (int) igmp->igmp_msgtype, (int) group->group_state, (int) &group, (int) group->interface)); - break; - } - } - - pbuf_free(p); - return; -} - -/** - * Join a group on one network interface. - * - * @param ifaddr ip address of the network interface which should join a new group - * @param groupaddr the ip address of the group which to join - * @return ERR_OK if group was joined on the netif(s), an err_t otherwise - */ -err_t -igmp_joingroup(struct ip_addr *ifaddr, struct ip_addr *groupaddr) -{ - err_t err = ERR_VAL; /* no matching interface */ - struct igmp_group *group; - struct netif *netif; - - /* make sure it is multicast address */ - LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;); - LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;); - - /* loop through netif's */ - netif = netif_list; - while (netif != NULL) { - /* Should we join this interface ? */ - if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) { - /* find group or create a new one if not found */ - group = igmp_lookup_group(netif, groupaddr); - - if (group != NULL) { - /* This should create a new group, check the state to make sure */ - if (group->group_state != IGMP_GROUP_NON_MEMBER) { - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n")); - } else { - /* OK - it was new group */ - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: ")); - ip_addr_debug_print(IGMP_DEBUG, groupaddr); - LWIP_DEBUGF(IGMP_DEBUG, ("\n")); - - /* If first use of the group, allow the group at the MAC level */ - if ((group->use==0) && (netif->igmp_mac_filter != NULL)) { - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD ")); - ip_addr_debug_print(IGMP_DEBUG, groupaddr); - LWIP_DEBUGF(IGMP_DEBUG, (") on if %x\n", (int) netif)); - netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER); - } - - IGMP_STATS_INC(igmp.join_sent); - igmp_send(group, IGMP_V2_MEMB_REPORT); - - igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR); - - /* Need to work out where this timer comes from */ - group->group_state = IGMP_GROUP_DELAYING_MEMBER; - } - /* Increment group use */ - group->use++; - /* Join on this interface */ - err = ERR_OK; - } else { - /* Return an error even if some network interfaces are joined */ - /** @todo undo any other netif already joined */ - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n")); - return ERR_MEM; - } - } - /* proceed to next network interface */ - netif = netif->next; - } - - return err; -} - -/** - * Leave a group on one network interface. - * - * @param ifaddr ip address of the network interface which should leave a group - * @param groupaddr the ip address of the group which to leave - * @return ERR_OK if group was left on the netif(s), an err_t otherwise - */ -err_t -igmp_leavegroup(struct ip_addr *ifaddr, struct ip_addr *groupaddr) -{ - err_t err = ERR_VAL; /* no matching interface */ - struct igmp_group *group; - struct netif *netif; - - /* make sure it is multicast address */ - LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;); - LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;); - - /* loop through netif's */ - netif = netif_list; - while (netif != NULL) { - /* Should we leave this interface ? */ - if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) { - /* find group */ - group = igmp_lookfor_group(netif, groupaddr); - - if (group != NULL) { - /* Only send a leave if the flag is set according to the state diagram */ - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: ")); - ip_addr_debug_print(IGMP_DEBUG, groupaddr); - LWIP_DEBUGF(IGMP_DEBUG, ("\n")); - - /* If there is no other use of the group */ - if (group->use <= 1) { - /* If we are the last reporter for this group */ - if (group->last_reporter_flag) { - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n")); - IGMP_STATS_INC(igmp.leave_sent); - igmp_send(group, IGMP_LEAVE_GROUP); - } - - /* Disable the group at the MAC level */ - if (netif->igmp_mac_filter != NULL) { - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL ")); - ip_addr_debug_print(IGMP_DEBUG, groupaddr); - LWIP_DEBUGF(IGMP_DEBUG, (") on if %x\n", (int) netif)); - netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER); - } - - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: ")); - ip_addr_debug_print(IGMP_DEBUG, groupaddr); - LWIP_DEBUGF(IGMP_DEBUG, ("\n")); - - /* Free the group */ - igmp_remove_group(group); - } else { - /* Decrement group use */ - group->use--; - } - /* Leave on this interface */ - err = ERR_OK; - } else { - /* It's not a fatal error on "leavegroup" */ - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n")); - } - } - /* proceed to next network interface */ - netif = netif->next; - } - - return err; -} - -/** - * The igmp timer function (both for NO_SYS=1 and =0) - * Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default). - */ -void -igmp_tmr(void) -{ - struct igmp_group *group = igmp_group_list; - - while (group != NULL) { - if (group->timer != 0) { - group->timer -= 1; - if (group->timer == 0) { - igmp_timeout(group); - } - } - group = group->next; - } -} - -/** - * Called if a timeout for one group is reached. - * Sends a report for this group. - * - * @param group an igmp_group for which a timeout is reached - */ -void -igmp_timeout(struct igmp_group *group) -{ - /* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */ - if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) { - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address ")); - ip_addr_debug_print(IGMP_DEBUG, &(group->group_address)); - LWIP_DEBUGF(IGMP_DEBUG, (" on if %x\n", (int) group->interface)); - - igmp_send(group, IGMP_V2_MEMB_REPORT); - } -} - -/** - * Start a timer for an igmp group - * - * @param group the igmp_group for which to start a timer - * @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with - * every call to igmp_tmr()) - */ -void -igmp_start_timer(struct igmp_group *group, u8_t max_time) -{ - /** - * @todo Important !! this should be random 0 -> max_time. Find out how to do this - */ - group->timer = max_time; -} - -/** - * Stop a timer for an igmp_group - * - * @param group the igmp_group for which to stop the timer - */ -void -igmp_stop_timer(struct igmp_group *group) -{ - group->timer = 0; -} - -/** - * Delaying membership report for a group if necessary - * - * @param group the igmp_group for which "delaying" membership report - * @param maxresp query delay - */ -void -igmp_delaying_member( struct igmp_group *group, u8_t maxresp) -{ - if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) || ((group->group_state == IGMP_GROUP_DELAYING_MEMBER) && (maxresp > group->timer))) { - igmp_start_timer(group, (maxresp)/2); - group->group_state = IGMP_GROUP_DELAYING_MEMBER; - } -} - - -/** - * Sends an IP packet on a network interface. This function constructs the IP header - * and calculates the IP header checksum. If the source IP address is NULL, - * the IP address of the outgoing network interface is filled in as source address. - * - * @param p the packet to send (p->payload points to the data, e.g. next - protocol header; if dest == IP_HDRINCL, p already includes an IP - header and p->payload points to that IP header) - * @param src the source IP address to send from (if src == IP_ADDR_ANY, the - * IP address of the netif used to send is used as source address) - * @param dest the destination IP address to send the packet to - * @param ttl the TTL value to be set in the IP header - * @param proto the PROTOCOL to be set in the IP header - * @param netif the netif on which to send this packet - * @return ERR_OK if the packet was sent OK - * ERR_BUF if p doesn't have enough space for IP/LINK headers - * returns errors returned by netif->output - */ -err_t -igmp_ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest, - u8_t ttl, u8_t proto, struct netif *netif) -{ - static u16_t ip_id = 0; - struct ip_hdr * iphdr = NULL; - u16_t * ra = NULL; - - /* First write in the "router alert" */ - if (pbuf_header(p, ROUTER_ALERTLEN)) { - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_ip_output_if: not enough room for IP header in pbuf\n")); - return ERR_BUF; - } - - /* This is the "router alert" option */ - ra = p->payload; - ra[0] = htons (ROUTER_ALERT); - ra[1] = 0x0000; /* Router shall examine packet */ - - /* now the normal ip header */ - if (pbuf_header(p, IP_HLEN)) { - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_ip_output_if: not enough room for IP header in pbuf\n")); - return ERR_BUF; - } - - iphdr = p->payload; - - /* Should the IP header be generated or is it already included in p? */ - if (dest != IP_HDRINCL) { - /** @todo should be shared with ip.c - ip_output_if */ - IPH_TTL_SET(iphdr, ttl); - IPH_PROTO_SET(iphdr, proto); - - ip_addr_set(&(iphdr->dest), dest); - - IPH_VHLTOS_SET(iphdr, 4, ((IP_HLEN + ROUTER_ALERTLEN) / 4), 0/*tos*/); - IPH_LEN_SET(iphdr, htons(p->tot_len)); - IPH_OFFSET_SET(iphdr, 0); - IPH_ID_SET(iphdr, htons(ip_id)); - ++ip_id; - - if (ip_addr_isany(src)) { - ip_addr_set(&(iphdr->src), &(netif->ip_addr)); - } else { - ip_addr_set(&(iphdr->src), src); - } - - IPH_CHKSUM_SET(iphdr, 0); -#if CHECKSUM_GEN_IP - IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, (IP_HLEN + ROUTER_ALERTLEN))); -#endif - } else { - dest = &(iphdr->dest); - } - -#if IP_DEBUG - ip_debug_print(p); -#endif - - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_ip_output_if: sending to if %x\n", (int) netif)); - - return netif->output(netif, p, dest); -} - -/** - * Send an igmp packet to a specific group. - * - * @param group the group to which to send the packet - * @param type the type of igmp packet to send - */ -void -igmp_send(struct igmp_group *group, u8_t type) -{ - struct pbuf* p = NULL; - struct igmp_msg* igmp = NULL; - struct ip_addr src = {0}; - struct ip_addr* dest = NULL; - - /* IP header + "router alert" option + IGMP header */ - p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM); - - if (p) { - igmp = p->payload; - LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg", - (p->len >= sizeof(struct igmp_msg))); - ip_addr_set(&src, &((group->interface)->ip_addr)); - - if (type == IGMP_V2_MEMB_REPORT) { - dest = &(group->group_address); - IGMP_STATS_INC(igmp.report_sent); - ip_addr_set(&(igmp->igmp_group_address), &(group->group_address)); - group->last_reporter_flag = 1; /* Remember we were the last to report */ - } else { - if (type == IGMP_LEAVE_GROUP) { - dest = &allrouters; - ip_addr_set(&(igmp->igmp_group_address), &(group->group_address)); - } - } - - if ((type == IGMP_V2_MEMB_REPORT) || (type == IGMP_LEAVE_GROUP)) { - igmp->igmp_msgtype = type; - igmp->igmp_maxresp = 0; - igmp->igmp_checksum = 0; - igmp->igmp_checksum = inet_chksum( igmp, IGMP_MINLEN); - - igmp_ip_output_if( p, &src, dest, IGMP_TTL, IP_PROTO_IGMP, group->interface); - } - - pbuf_free (p); - } else { - LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n")); - } -} - -#endif /* LWIP_IGMP */