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Add functions to join/leave IGMP group by netif

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Existing functions are based on IP address, but the address is used
only to look up which netif to act on. The netif-based core code is
extracted to new exported functions.

If you have a netif handle, this makes it easier to join/leave
groups, without the need to convert to IP address first only for the
IGMP code to convert back to netif.
This commit is contained in:
Erik Ekman 2015-09-28 16:38:31 +02:00 committed by goldsimon
parent 373714c02f
commit ba71ac78d9
2 changed files with 131 additions and 83 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

212
src/core/ipv4/igmp.c
View File

@ -488,9 +488,8 @@ igmp_input(struct pbuf *p, struct netif *inp, const ip4_addr_t *dest)
err_t
igmp_joingroup(const ip4_addr_t *ifaddr, const ip4_addr_t *groupaddr)
{
err_t err = ERR_VAL; /* no matching interface */
struct igmp_group *group;
struct netif *netif;
err_t err = ERR_VAL; /* no matching interface */
struct netif *netif;
/* make sure it is multicast address */
LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip4_addr_ismulticast(groupaddr), return ERR_VAL;);
@ -501,44 +500,11 @@ igmp_joingroup(const ip4_addr_t *ifaddr, const ip4_addr_t *groupaddr)
while (netif != NULL) {
/* Should we join this interface ? */
if ((netif->flags & NETIF_FLAG_IGMP) && ((ip4_addr_isany(ifaddr) || ip4_addr_cmp(netif_ip4_addr(netif), 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: "));
ip4_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 "));
ip4_addr_debug_print(IGMP_DEBUG, groupaddr);
LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", (void*)netif));
netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
}
IGMP_STATS_INC(igmp.tx_join);
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 {
err = igmp_joingroup_netif(netif, groupaddr);
if (err != ERR_OK) {
/* Return an error even if some network interfaces are joined */
/** @todo undo any other netif already joined */
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enough memory to join to group\n"));
return ERR_MEM;
return err;
}
}
/* proceed to next network interface */
@ -548,6 +514,63 @@ igmp_joingroup(const ip4_addr_t *ifaddr, const ip4_addr_t *groupaddr)
return err;
}
/**
* Join a group on one network interface.
*
* @param netif 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, an err_t otherwise
*/
err_t igmp_joingroup_netif(struct netif *netif, const ip4_addr_t *groupaddr)
{
struct igmp_group *group;
/* make sure it is multicast address */
LWIP_ERROR("igmp_joingroup_netif: attempt to join non-multicast address", ip4_addr_ismulticast(groupaddr), return ERR_VAL;);
LWIP_ERROR("igmp_joingroup_netif: attempt to join allsystems address", (!ip4_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
/* make sure it is an igmp-enabled netif */
LWIP_ERROR("igmp_joingroup_netif: attempt to join on non-IGMP netif", netif->flags & NETIF_FLAG_IGMP, return ERR_VAL;);
/* 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_netif: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
} else {
/* OK - it was new group */
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup_netif: join to new group: "));
ip4_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_netif: igmp_mac_filter(ADD "));
ip4_addr_debug_print(IGMP_DEBUG, groupaddr);
LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", (void*)netif));
netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
}
IGMP_STATS_INC(igmp.tx_join);
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 */
return ERR_OK;
} else {
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup_netif: Not enough memory to join to group\n"));
return ERR_MEM;
}
}
/**
* Leave a group on one network interface.
*
@ -558,9 +581,8 @@ igmp_joingroup(const ip4_addr_t *ifaddr, const ip4_addr_t *groupaddr)
err_t
igmp_leavegroup(const ip4_addr_t *ifaddr, const ip4_addr_t *groupaddr)
{
err_t err = ERR_VAL; /* no matching interface */
struct igmp_group *group;
struct netif *netif;
err_t err = ERR_VAL; /* no matching interface */
struct netif *netif;
/* make sure it is multicast address */
LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip4_addr_ismulticast(groupaddr), return ERR_VAL;);
@ -571,47 +593,10 @@ igmp_leavegroup(const ip4_addr_t *ifaddr, const ip4_addr_t *groupaddr)
while (netif != NULL) {
/* Should we leave this interface ? */
if ((netif->flags & NETIF_FLAG_IGMP) && ((ip4_addr_isany(ifaddr) || ip4_addr_cmp(netif_ip4_addr(netif), 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: "));
ip4_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.tx_leave);
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 "));
ip4_addr_debug_print(IGMP_DEBUG, groupaddr);
LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", (void*)netif));
netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
}
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
ip4_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"));
err_t res = igmp_leavegroup_netif(netif, groupaddr);
if (err != ERR_OK) {
/* Store this result if we have not yet gotten a success */
err = res;
}
}
/* proceed to next network interface */
@ -621,6 +606,67 @@ igmp_leavegroup(const ip4_addr_t *ifaddr, const ip4_addr_t *groupaddr)
return err;
}
/**
* Leave a group on one network interface.
*
* @param netif 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, an err_t otherwise
*/
err_t igmp_leavegroup_netif(struct netif *netif, const ip4_addr_t *groupaddr)
{
struct igmp_group *group;
/* make sure it is multicast address */
LWIP_ERROR("igmp_leavegroup_netif: attempt to leave non-multicast address", ip4_addr_ismulticast(groupaddr), return ERR_VAL;);
LWIP_ERROR("igmp_leavegroup_netif: attempt to leave allsystems address", (!ip4_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
/* make sure it is an igmp-enabled netif */
LWIP_ERROR("igmp_leavegroup_netif: attempt to leave on non-IGMP netif", netif->flags & NETIF_FLAG_IGMP, return ERR_VAL;);
/* 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_netif: Leaving group: "));
ip4_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_netif: sending leaving group\n"));
IGMP_STATS_INC(igmp.tx_leave);
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_netif: igmp_mac_filter(DEL "));
ip4_addr_debug_print(IGMP_DEBUG, groupaddr);
LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", (void*)netif));
netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
}
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup_netif: remove group: "));
ip4_addr_debug_print(IGMP_DEBUG, groupaddr);
LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
/* Free the group */
igmp_remove_group(group);
} else {
/* Decrement group use */
group->use--;
}
return ERR_OK;
} else {
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup_netif: not member of group\n"));
return ERR_VAL;
}
}
/**
* The igmp timer function (both for NO_SYS=1 and =0)
* Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).

2
src/include/lwip/igmp.h
View File

@ -94,7 +94,9 @@ void igmp_report_groups(struct netif *netif);
struct igmp_group *igmp_lookfor_group(struct netif *ifp, const ip4_addr_t *addr);
void igmp_input(struct pbuf *p, struct netif *inp, const ip4_addr_t *dest);
err_t igmp_joingroup(const ip4_addr_t *ifaddr, const ip4_addr_t *groupaddr);
err_t igmp_joingroup_netif(struct netif *netif, const ip4_addr_t *groupaddr);
err_t igmp_leavegroup(const ip4_addr_t *ifaddr, const ip4_addr_t *groupaddr);
err_t igmp_leavegroup_netif(struct netif *netif, const ip4_addr_t *groupaddr);
void igmp_tmr(void);
#ifdef __cplusplus