Hello,
I aim at making a MLD General Query and sending it in
the tunnels towards the mobiles. I successfuly create
the message which is correct, it works when i send on
the LAN interface (i'm working on the home agent),
but
i get an error "Network is unreachable" when i send
it
on a tunnel interface.
Here follows the source code. Has anyone a clue ?
Thx
Fred
#########################################################
/** The structure of a MLDv1 report */
struct mld6_v1_hdr {
/** The ICMPv6 structure */
struct icmp6_hdr mld_icmp6_hdr;
/** The IPv6 address of the multicast group */
struct in6_addr mld6_addr;
};
int send_general_query(int iface)
{
struct mld6_v1_hdr mld;
int offset = 2;
int length;
int sockfd;
struct sockaddr_in6 src;
struct sockaddr_in6 dst;
struct msghdr msgh;
struct cmsghdr *cmsgh;
struct iovec iovector;
char control[128];
/* ra is the complete HOP-by-HOP router alert option
*/
char ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_PADN, 0,
IPV6_TLV_ROUTERALERT, 2, 0, 0 };
/* an ICMP socket for the home agent LAN interface
*/
if( (sockfd = socket( AF_INET6, SOCK_RAW,
IPPROTO_ICMPV6)) <0 )
{
perror("Socket Creation");
return -1;
}
memset( &src, 0, sizeof(struct sockaddr_in6) );
memset( &dst, 0, sizeof(struct sockaddr_in6) );
/* dest address is ff02::1 */
if( (inet_pton(AF_INET6, "ff02::1",
&dst.sin6_addr)) == -1)
{
fprintf(stderr,"send_general_query : Problem
with address resolution\n");
if(debug_lvl == VERBOSE)
fprintf(log_file,"send_general_query : Problem
with
address resolution\n");
return FALSE;
}
dst.sin6_family = AF_INET6;
dst.sin6_port = htons(0);
dst.sin6_scope_id = iface;
/* Setting up SRC */
src.sin6_family = AF_INET6;
src.sin6_port = htons(0);
src.sin6_addr = member_tab.oif_addr; /* my ipv6
addressz */
src.sin6_scope_id = iface;
length = sizeof(struct sockaddr_in6);
if ( bind(sockfd, (struct sockaddr *)&src, length)
==
-1)
{
perror("Could not bind");
return -1;
}
/* the MLD v1 query message */
memset( &mld, 0, sizeof(struct mld6_v1_hdr) );
mld.mld_icmp6_hdr.icmp6_type =
ICMP6_MEMBERSHIP_QUERY;
mld.mld_icmp6_hdr.icmp6_code = 0;
mld.mld_icmp6_hdr.icmp6_cksum = 0;
mld.mld_icmp6_hdr.icmp6_dataun.icmp6_un_data16[0] =
htons(100);
mld.mld_icmp6_hdr.icmp6_dataun.icmp6_un_data16[0] =
0;
mld.mld6_addr = in6addr_any;
memset( &iovector, 0, sizeof(struct iovec) );
iovector.iov_base = &mld;
iovector.iov_len = sizeof(struct mld6_v1_hdr);
memset( &msgh, 0, sizeof(struct msghdr) );
msgh.msg_name = &dst;
msgh.msg_namelen = sizeof(struct sockaddr_in6);
msgh.msg_iov = &iovector;
msgh.msg_iovlen = 1;
msgh.msg_control = control;
msgh.msg_controllen = 128;
/* set ancillary data options + copy hop-by-hop
option */
cmsgh = CMSG_FIRSTHDR(&msgh);
cmsgh->cmsg_len = CMSG_LEN(8);
cmsgh->cmsg_level = SOL_IPV6;
cmsgh->cmsg_type = IPV6_HOPOPTS;
memcpy( (void *)CMSG_DATA(cmsgh), (void *)ra,
sizeof(ra) );
msgh.msg_controllen = cmsgh->cmsg_len;
/* ask kernel to compute ICMP checksum */
if (setsockopt(sockfd,
IPPROTO_IPV6,IPV6_CHECKSUM,&offset,sizeof(offset)) <
0)
{
perror ("Couldn't setsockopt IPV6_CHECKSUM");
return(-1);
}
if( (sendmsg( sockfd, &msgh, MSG_DONTROUTE )) <= 0)
{
perror("(V1)Problem with sendmsg");
return -1;
}
close(sockfd);
return 0;
}
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