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ipv6: Add support for sending packets through a router 

The network boot over IPv6 currently fails if the TFTP server
is not in the same subnet as the SLOF client. In that case we
have to fill in the MAC address of a router into our packets
to get them to the right place.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
This commit is contained in:
Thomas Huth 2016-04-07 09:32:19 +02:00 committed by Alexey Kardashevskiy
parent 978d2392e9
commit 39acf5a553
3 changed files with 41 additions and 0 deletions
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23
clients/net-snk/app/netlib/ipv6.c
View File

@ -13,6 +13,7 @@
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <time.h>
#include <ctype.h>
#include <sys/socket.h>
@ -416,6 +417,21 @@ static uint8_t *ip6_to_multicast_mac(ip6_addr_t * ip, uint8_t *mc_mac)
return mc_mac;
}
/**
* Check whether an IPv6 address is on the same network as we are
*/
static bool is_ip6addr_in_my_net(ip6_addr_t *ip)
{
struct ip6addr_list_entry *n = NULL;
for (n = first_ip6; n != NULL; n = n->next) {
if (n->addr.part.prefix == ip->part.prefix)
return true; /* IPv6 address is in our neighborhood */
}
return false; /* not in our neighborhood */
}
/**
* NET: calculate checksum over IPv6 header and upper-layer protocol
* (e.g. UDP or ICMPv6)
@ -517,6 +533,10 @@ int send_ipv6(int fd, void* buffer, int len)
if (n) {
if (memcmp(n->mac, null_mac, ETH_ALEN) != 0)
memcpy (mac_addr, &(n->mac), ETH_ALEN); /* found it */
} else if (!is_ip6addr_in_my_net(&ip_dst)) {
struct router *gw;
gw = ipv6_get_default_router(&ip6h->src);
mac_addr = gw ? gw->mac : null_mac;
} else {
mac_addr = null_mac;
n = malloc(sizeof(struct neighbor));
@ -547,6 +567,9 @@ int send_ipv6(int fd, void* buffer, int len)
}
}
if (mac_addr == null_mac)
return -1;
fill_ethhdr (n->eth_frame, htons(ETHERTYPE_IPv6), get_mac_address(),
mac_addr);
memcpy (&(n->eth_frame[sizeof(struct ethhdr)]), buffer, len);

17
clients/net-snk/app/netlib/ndp.c
View File

@ -84,6 +84,23 @@ find_router( ip6_addr_t *ip )
return NULL; /* router is unknown */
}
/**
* Find a router for a given host address
* @param ip - IPv6 address with the prefered prefix
* @return pointer to router, or NULL if none is available
*/
struct router *ipv6_get_default_router(ip6_addr_t *ip)
{
struct router *n = NULL;
for (n = first_router; n != NULL; n = n->next) {
if (n->ip.part.prefix == ip->part.prefix)
return n;
}
return first_router;
}
/*
* NET: add new neighbor to list
* @param struct neighbor nghb - new neighbor

1
clients/net-snk/app/netlib/ndp.h
View File

@ -67,5 +67,6 @@ struct neighbor * find_neighbor (ip6_addr_t *);
int8_t router_add(struct router*);
void * router_create(uint8_t *mac, ip6_addr_t *ip);
struct router * find_router(ip6_addr_t *);
struct router *ipv6_get_default_router(ip6_addr_t *ip);
#endif //_NDP_H_