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6lowpan: add 802.15.4 short addr slaac

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This patch adds the autoconfiguration if a valid 802.15.4 short address
is available for 802.15.4 6LoWPAN interfaces.

Cc: David S. Miller <davem@davemloft.net>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: James Morris <jmorris@namei.org>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: Patrick McHardy <kaber@trash.net>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Alexander Aring <aar@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Aring 2016-06-15 21:20:17 +02:00 committed by David S. Miller
parent 8626a0c83b
commit 2ad3ed5919
4 changed files with 58 additions and 2 deletions
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6
include/net/6lowpan.h
View file

@ -254,6 +254,12 @@ static inline bool lowpan_fetch_skb(struct sk_buff *skb, void *data,
return false;
}
static inline bool lowpan_802154_is_valid_src_short_addr(__le16 addr)
{
/* First bit of addr is multicast, reserved or 802.15.4 specific */
return !(addr & cpu_to_le16(0x8000));
}
static inline void lowpan_push_hc_data(u8 **hc_ptr, const void *data,
const size_t len)
{

3
include/net/addrconf.h
View file

@ -94,6 +94,9 @@ int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
void addrconf_add_linklocal(struct inet6_dev *idev,
const struct in6_addr *addr, u32 flags);
static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
{
if (dev->addr_len != ETH_ALEN)

46
net/6lowpan/core.c
View file

@ -14,6 +14,7 @@
#include <linux/module.h>
#include <net/6lowpan.h>
#include <net/addrconf.h>
#include "6lowpan_i.h"
@ -72,16 +73,61 @@ void lowpan_unregister_netdev(struct net_device *dev)
}
EXPORT_SYMBOL(lowpan_unregister_netdev);
static int addrconf_ifid_802154_6lowpan(u8 *eui, struct net_device *dev)
{
struct wpan_dev *wpan_dev = lowpan_802154_dev(dev)->wdev->ieee802154_ptr;
/* Set short_addr autoconfiguration if short_addr is present only */
if (!lowpan_802154_is_valid_src_short_addr(wpan_dev->short_addr))
return -1;
/* For either address format, all zero addresses MUST NOT be used */
if (wpan_dev->pan_id == cpu_to_le16(0x0000) &&
wpan_dev->short_addr == cpu_to_le16(0x0000))
return -1;
/* Alternatively, if no PAN ID is known, 16 zero bits may be used */
if (wpan_dev->pan_id == cpu_to_le16(IEEE802154_PAN_ID_BROADCAST))
memset(eui, 0, 2);
else
ieee802154_le16_to_be16(eui, &wpan_dev->pan_id);
/* The "Universal/Local" (U/L) bit shall be set to zero */
eui[0] &= ~2;
eui[2] = 0;
eui[3] = 0xFF;
eui[4] = 0xFE;
eui[5] = 0;
ieee802154_le16_to_be16(&eui[6], &wpan_dev->short_addr);
return 0;
}
static int lowpan_event(struct notifier_block *unused,
unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct inet6_dev *idev;
struct in6_addr addr;
int i;
if (dev->type != ARPHRD_6LOWPAN)
return NOTIFY_DONE;
idev = __in6_dev_get(dev);
if (!idev)
return NOTIFY_DONE;
switch (event) {
case NETDEV_UP:
case NETDEV_CHANGE:
/* (802.15.4 6LoWPAN short address slaac handling */
if (lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154) &&
addrconf_ifid_802154_6lowpan(addr.s6_addr + 8, dev) == 0) {
__ipv6_addr_set_half(&addr.s6_addr32[0],
htonl(0xFE800000), 0);
addrconf_add_linklocal(idev, &addr, 0);
}
break;
case NETDEV_DOWN:
for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++)
clear_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE,

5
net/ipv6/addrconf.c
View file

@ -2947,8 +2947,8 @@ static void init_loopback(struct net_device *dev)
}
}
static void addrconf_add_linklocal(struct inet6_dev *idev,
const struct in6_addr *addr, u32 flags)
void addrconf_add_linklocal(struct inet6_dev *idev,
const struct in6_addr *addr, u32 flags)
{
struct inet6_ifaddr *ifp;
u32 addr_flags = flags | IFA_F_PERMANENT;
@ -2967,6 +2967,7 @@ static void addrconf_add_linklocal(struct inet6_dev *idev,
in6_ifa_put(ifp);
}
}
EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
static bool ipv6_reserved_interfaceid(struct in6_addr address)
{