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fixed bug #38165 (socket with mulicast): ensure igmp membership are dropped when socket (not netconn!) is closed.

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This commit is contained in:
sg 2015-02-25 21:30:22 +01:00
parent 612e33c499
commit c8581e4cd9
2 changed files with 116 additions and 2 deletions
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4
CHANGELOG
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@ -202,6 +202,10 @@ HISTORY
++ Bugfixes:
2015-02-25: Simon Goldschmidt
* sockets.c: fixed bug #38165 (socket with mulicast): ensure igmp membership
are dropped when socket (not netconn!) is closed.
2015-02-25: Simon Goldschmidt
* ip4.h/.c, udp.c: fixed bug #38061 (wrong multicast routing in IPv4) by
adding an optional default netif for multicast routing

114
src/api/sockets.c
View File

@ -237,6 +237,29 @@ union sockaddr_aligned {
struct sockaddr_in sin;
};
#if LWIP_IGMP
/* Define the number of IPv4 multicast memberships, default is one per socket */
#ifndef LWIP_SOCKET_MAX_MEMBERSHIPS
#define LWIP_SOCKET_MAX_MEMBERSHIPS NUM_SOCKETS
#endif
/* This is to keep track of IP_ADD_MEMBERSHIP calls to drop the membership when
a socket is closed */
struct lwip_socket_multicast_pair {
/** the socket (+1 to not require initialization) */
int sa;
/** the interface address */
ip_addr_t if_addr;
/** the group address */
ip_addr_t multi_addr;
};
struct lwip_socket_multicast_pair socket_ipv4_multicast_memberships[LWIP_SOCKET_MAX_MEMBERSHIPS];
static int lwip_socket_register_membership(int s, ip_addr_t *if_addr, ip_addr_t *multi_addr);
static void lwip_socket_unregister_membership(int s, ip_addr_t *if_addr, ip_addr_t *multi_addr);
static void lwip_socket_drop_registered_memberships(int s);
#endif /* LWIP_IGMP */
/** The global array of available sockets */
static struct lwip_sock sockets[NUM_SOCKETS];
@ -577,6 +600,11 @@ lwip_close(int s)
LWIP_ASSERT("sock->lastdata == NULL", sock->lastdata == NULL);
}
#if LWIP_IGMP
/* drop all possibly joined IGMP memberships */
lwip_socket_drop_registered_memberships(s);
#endif /* LWIP_IGMP */
err = netconn_delete(sock->conn);
if (err != ERR_OK) {
sock_set_errno(sock, err_to_errno(err));
@ -2162,10 +2190,17 @@ lwip_setsockopt_impl(int s, int level, int optname, const void *optval, socklen_
LWIP_SOCKOPT_CHECK_OPTLEN_CONN_PCB_TYPE(sock, optlen, struct ip_mreq, NETCONN_UDP);
inet_addr_to_ipaddr(&if_addr, &imr->imr_interface);
inet_addr_to_ipaddr(&multi_addr, &imr->imr_multiaddr);
if(optname == IP_ADD_MEMBERSHIP){
igmp_err = igmp_joingroup(&if_addr, &multi_addr);
if(optname == IP_ADD_MEMBERSHIP) {
if (!lwip_socket_register_membership(s, &if_addr, &multi_addr)) {
/* cannot track membership (out of memory) */
err = ENOMEM;
igmp_err = ERR_OK;
} else {
igmp_err = igmp_joingroup(&if_addr, &multi_addr);
}
} else {
igmp_err = igmp_leavegroup(&if_addr, &multi_addr);
lwip_socket_unregister_membership(s, &if_addr, &multi_addr);
}
if (igmp_err != ERR_OK) {
err = EADDRNOTAVAIL;
@ -2454,4 +2489,79 @@ lwip_fcntl(int s, int cmd, int val)
return ret;
}
#if LWIP_IGMP
/** Register a new IGMP membership. On socket close, the membership is dropped automatically.
*
* ATTENTION: this function is called from tcpip_thread (or under CORE_LOCK).
*
* @return 1 on success, 0 on failure
*/
static int
lwip_socket_register_membership(int s, ip_addr_t *if_addr, ip_addr_t *multi_addr)
{
/* s+1 is stored in the array to prevent having to initialize the array
(default initialization is to 0) */
int sa = s + 1;
int i;
for (i = 0; i < LWIP_SOCKET_MAX_MEMBERSHIPS; i++) {
if (socket_ipv4_multicast_memberships[i].sa == 0) {
socket_ipv4_multicast_memberships[i].sa = sa;
ip_addr_copy(socket_ipv4_multicast_memberships[i].if_addr, *if_addr);
ip_addr_copy(socket_ipv4_multicast_memberships[i].multi_addr, *multi_addr);
return 1;
}
}
return 0;
}
/** Unregister a previously registered membership. This prevents dropping the membership
* on socket close.
*
* ATTENTION: this function is called from tcpip_thread (or under CORE_LOCK).
*/
static void
lwip_socket_unregister_membership(int s, ip_addr_t *if_addr, ip_addr_t *multi_addr)
{
/* s+1 is stored in the array to prevent having to initialize the array
(default initialization is to 0) */
int sa = s + 1;
int i;
for (i = 0; i < LWIP_SOCKET_MAX_MEMBERSHIPS; i++) {
if ((socket_ipv4_multicast_memberships[i].sa == sa) &&
ip_addr_cmp(&socket_ipv4_multicast_memberships[i].if_addr, if_addr) &&
ip_addr_cmp(&socket_ipv4_multicast_memberships[i].multi_addr, multi_addr)) {
socket_ipv4_multicast_memberships[i].sa = 0;
ip_addr_set_zero(&socket_ipv4_multicast_memberships[i].if_addr);
ip_addr_set_zero(&socket_ipv4_multicast_memberships[i].multi_addr);
return;
}
}
}
/** Drop all memberships of a socket that were not dropped explicitly via setsockopt.
*
* ATTENTION: this function is called NOT called from tcpip_thread (or under CORE_LOCK).
*/
static void lwip_socket_drop_registered_memberships(int s)
{
/* s+1 is stored in the array to prevent having to initialize the array
(default initialization is to 0) */
int sa = s + 1;
int i;
LWIP_ASSERT("socket has no netconn", sockets[s].conn != NULL);
for (i = 0; i < LWIP_SOCKET_MAX_MEMBERSHIPS; i++) {
if (socket_ipv4_multicast_memberships[i].sa == sa) {
netconn_join_leave_group(sockets[s].conn, &socket_ipv4_multicast_memberships[i].if_addr,
&socket_ipv4_multicast_memberships[i].multi_addr, NETCONN_LEAVE);
socket_ipv4_multicast_memberships[i].sa = 0;
ip_addr_set_zero(&socket_ipv4_multicast_memberships[i].if_addr);
ip_addr_set_zero(&socket_ipv4_multicast_memberships[i].multi_addr);
}
}
}
#endif /* LWIP_IGMP */
#endif /* LWIP_SOCKET */