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udhcp6: read_interface should save link-local ipv6 address

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Patch is based on work by tiggerswelt.net. They say:
"Using this patch it was no problem to acquire an IPv6-Address via DHCPv6
using ISC DHCPD6 on server-side."

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-03-27 22:10:15 +02:00
parent 8f3bf4f0d3
commit e09f5e3045
3 changed files with 71 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
networking/udhcp/d6_common.h
View File

@ -91,10 +91,14 @@ struct client6_data_t {
struct d6_option *ia_na;
char **env_ptr;
unsigned env_idx;
/* link-local IPv6 address */
struct in6_addr ll_ip6;
};
#define client6_data (*(struct client6_data_t*)(&bb_common_bufsiz1[COMMON_BUFSIZE - sizeof(struct client6_data_t)]))
int FAST_FUNC d6_read_interface(const char *interface, int *ifindex, struct in6_addr *nip6, uint8_t *mac);
int FAST_FUNC d6_listen_socket(int port, const char *inf);
int FAST_FUNC d6_recv_kernel_packet(

11
networking/udhcp/d6_dhcpc.c
View File

@ -311,7 +311,7 @@ static int d6_mcast_from_client_config_ifindex(struct d6_packet *packet, uint8_t
return d6_send_raw_packet(
packet, (end - (uint8_t*) packet),
/*src*/ NULL, CLIENT_PORT6,
/*src*/ &client6_data.ll_ip6, CLIENT_PORT6,
/*dst*/ (struct in6_addr*)FF02__1_2, SERVER_PORT6, MAC_BCAST_ADDR,
client_config.ifindex
);
@ -1003,9 +1003,9 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
udhcp_str2optset(optstr, &client_config.options);
}
if (udhcp_read_interface(client_config.interface,
if (d6_read_interface(client_config.interface,
&client_config.ifindex,
NULL,
&client6_data.ll_ip6,
client_config.client_mac)
) {
return 1;
@ -1106,13 +1106,14 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
* or if the status of the bridge changed).
* Refresh ifindex and client_mac:
*/
if (udhcp_read_interface(client_config.interface,
if (d6_read_interface(client_config.interface,
&client_config.ifindex,
NULL,
&client6_data.ll_ip6,
client_config.client_mac)
) {
goto ret0; /* iface is gone? */
}
memcpy(clientid_mac_ptr, client_config.client_mac, 6);
/* We will restart the wait in any case */

61
networking/udhcp/d6_socket.c
View File

@ -7,6 +7,67 @@
#include "common.h"
#include "d6_common.h"
#include <net/if.h>
#include <ifaddrs.h>
#include <netpacket/packet.h>
int FAST_FUNC d6_read_interface(const char *interface, int *ifindex, struct in6_addr *nip6, uint8_t *mac)
{
int retval = 3;
struct ifaddrs *ifap, *ifa;
getifaddrs(&ifap);
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
struct sockaddr_in6 *sip6;
if (!ifa->ifa_addr || (strcmp(ifa->ifa_name, interface) != 0))
continue;
sip6 = (struct sockaddr_in6*)(ifa->ifa_addr);
if (ifa->ifa_addr->sa_family == AF_PACKET) {
struct sockaddr_ll *sll = (struct sockaddr_ll*)(ifa->ifa_addr);
memcpy(mac, sll->sll_addr, 6);
log1("MAC %02x:%02x:%02x:%02x:%02x:%02x", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
log1("adapter index %d", sll->sll_ifindex);
*ifindex = sll->sll_ifindex;
retval &= (0xf - (1<<0));
}
#if 0
if (ifa->ifa_addr->sa_family == AF_INET) {
*nip = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr;
log1("IP %s", inet_ntoa(((struct sockaddr_in *)ifa->ifa_addr)->sin_addr));
}
#endif
if (ifa->ifa_addr->sa_family == AF_INET6
&& IN6_IS_ADDR_LINKLOCAL(&sip6->sin6_addr)
) {
*nip6 = sip6->sin6_addr; /* struct copy */
log1(
"IPv6 %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x",
nip6->s6_addr[0], nip6->s6_addr[1],
nip6->s6_addr[2], nip6->s6_addr[3],
nip6->s6_addr[4], nip6->s6_addr[5],
nip6->s6_addr[6], nip6->s6_addr[7],
nip6->s6_addr[8], nip6->s6_addr[9],
nip6->s6_addr[10], nip6->s6_addr[11],
nip6->s6_addr[12], nip6->s6_addr[13],
nip6->s6_addr[14], nip6->s6_addr[15]
);
retval &= (0xf - (1<<1));
}
}
freeifaddrs(ifap);
if (retval == 0)
return retval;
if (retval & (1<<0))
bb_error_msg("can't get %s", "MAC");
if (retval & (1<<1))
bb_error_msg("can't get %s", "link-local IPv6 address");
return -1;
}
int FAST_FUNC d6_listen_socket(int port, const char *inf)
{