hello...
In mainline kernel there is support for two radios at86rf230 and mrf24j40. And
cc2420 radio support is there in outside tree. I am implementing the driver for
cc2520 radio. I will complete it soon...
The attached documents are patches for implementing the RFC6775. Please check
the patches and give me suggestions if any changes are required. I did not
submit these patches to the ipv6 linux community. After any suggestions from
linux-zigbee-devel i will submit my patches to ipv6-linux community.
Regards,
Bhadram
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--- a/net/ipv6/ndisc.c 2013-09-14 19:37:01.000000000 +0530
+++ b/net/ipv6/ndisc.c 2013-09-23 16:30:12.000000000 +0530
@@ -61,6 +61,8 @@
#include <net/addrconf.h>
#include <net/icmp.h>
+#include <net/af_ieee802154.h> //ieee802154 address family header
+
#include <net/netlink.h>
#include <linux/rtnetlink.h>
@@ -164,6 +166,35 @@
memset(opt, 0, space);
}
+static void ndisc_fill_tllao_option(struct sk_buff *skb,int type,void *addr)
+{
+ int data_len = skb->dev->addr_len;
+
+ u8 *opt = (u8 *)skb_put(skb,data_len+2);
+
+ opt[0] = type;
+ opt[1] = data_len>>3; //FIXME: It should represent in 8octets=1 format
+ //but we are having 10octets : SO HOW WE CAN REPRESENT ?
+ memcpy(opt+2,addr,data_len);
+
+ return;
+}
+
+static void ndisc_fill_aro_option(struct sk_buff *skb,int type,struct aro_option *aro)
+{
+ int space = ndisc_opt_addr_space(skb->dev);
+
+ struct aro_option *opt = (struct aro_option *)skb_put(skb,space);
+ if (sizeof(*opt) != sizeof(*aro)) {
+ ND_PRINTK(2,warn,"ARO : error in handling ARO option\n");
+ return;
+ }
+
+ *opt = *aro;
+
+ return;
+}
+
static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
struct nd_opt_hdr *end)
{
@@ -234,6 +265,20 @@
ndopts->nd_opts_ri = nd_opt;
break;
#endif
+ /*RFC6775 options for 6lowpan*/
+ case ND_OPT_ARO:
+ if (!ndopts->nd_opts_aro)
+ ndopts->nd_opts_aro = nd_opt;
+ break;
+ case ND_OPT_6CO:
+ if (!ndopts->nd_opts_6co)
+ ndopts->nd_opts_6co = nd_opt;
+ break;
+ case ND_OPT_ABRO:
+ if (!ndopts->nd_opts_abro)
+ ndopts->nd_opts_abro = nd_opt;
+ break;
+
default:
if (ndisc_is_useropt(nd_opt)) {
ndopts->nd_useropts_end = nd_opt;
@@ -465,7 +510,8 @@
static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
const struct in6_addr *daddr,
const struct in6_addr *solicited_addr,
- bool router, bool solicited, bool override, bool inc_opt)
+ bool router, bool solicited, bool override, bool inc_opt,
+ struct aro_option *aro)
{
struct sk_buff *skb;
struct in6_addr tmpaddr;
@@ -492,8 +538,13 @@
if (!dev->addr_len)
inc_opt = 0;
- if (inc_opt)
+
+
+ if (inc_opt) {
optlen += ndisc_opt_addr_space(dev);
+ if (dev->addr_len == IEEE802154_ADDR_LEN)
+ optlen += IEEE802154_ADDR_LEN;
+ }
skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
if (!skb)
@@ -509,12 +560,16 @@
},
.target = *solicited_addr,
};
-
- if (inc_opt)
- ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR,
+
+ if (inc_opt) {
+ if (dev->type == ARPHRD_IEEE802154) {
+ ndisc_fill_tllao_option(skb,ND_OPT_TARGET_LL_ADDR,
+ dev->dev_addr);
+ ndisc_fill_aro_option(skb,ND_OPT_ARO,aro); //FIXME: how to get the aro option structure
+ } else
+ ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR,
dev->dev_addr);
-
-
+ }
ndisc_send_skb(skb, daddr, src_addr);
}
@@ -532,7 +587,7 @@
ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &ifa->addr,
/*router=*/ !!idev->cnf.forwarding,
/*solicited=*/ false, /*override=*/ true,
- /*inc_opt=*/ true);
+ /*inc_opt=*/ true,NULL);
}
read_unlock_bh(&idev->lock);
@@ -704,6 +759,8 @@
bool inc;
int is_router = -1;
+ struct aro_option *aro;
+
if (skb->len < sizeof(struct nd_msg)) {
ND_PRINTK(2, warn, "NS: packet too short\n");
return;
@@ -748,6 +805,41 @@
}
}
+ /* Handling of ARO option according to RFC6775*/
+ if (dev->type == ARPHRD_IEEE802154) {
+ if (ndopts.nd_opts_aro) {
+ //TODO : check the status field should be zero otherwise discard it
+ memcpy(&aro->status,(u8 *)(ndopts.nd_opts_aro+1),sizeof(aro->status));
+ memcpy(&aro->reg_lifetime,(u16 *)(ndopts.nd_opts_aro+3),sizeof(aro->reg_lifetime));
+ memcpy(aro->eui_64,(u8 *)(ndopts.nd_opts_aro+4),8);
+
+ if (aro->status == 0) {
+ ND_PRINTK(2,warn,"ARO: invalid status option must be discard the packet\n");
+ return ;
+ }
+ /*lookup in the neighbour table i.e NC */
+ neigh = neigh_lookup(&nd_tbl,saddr,dev);
+
+ if (neigh) {
+ if (memcmp(neigh->ha,aro->eui_64,8)) {
+ //FIXME:update registration life time
+ aro->status = 0;
+ } else
+ aro->status = 1;
+ } else {
+ neigh = neigh_create(&nd_tbl,saddr,dev);
+ if (neigh) {
+ neigh_update(neigh,aro->eui_64,NUD_STALE,0);
+ //TODO : update registration life time
+ aro->status = 0;
+ }
+ }
+ }
+ }
+
+ if (dev->type == ARPHRD_IEEE802154)
+ ndisc_send_na(dev,neigh,daddr,&msg->target,idev->cnf.forwarding,true,false,true,aro);
+
inc = ipv6_addr_is_multicast(daddr);
ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
@@ -783,7 +875,6 @@
/* XXX: count this drop? */
return;
}
-
if (ipv6_chk_acast_addr(net, dev, &msg->target) ||
(idev->cnf.forwarding &&
(net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) &&
@@ -813,7 +904,7 @@
if (dad) {
ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target,
- !!is_router, false, (ifp != NULL), true);
+ !!is_router, false, (ifp != NULL), true,NULL);
goto out;
}
@@ -835,7 +926,7 @@
if (neigh || !dev->header_ops) {
ndisc_send_na(dev, neigh, saddr, &msg->target,
!!is_router,
- true, (ifp != NULL && inc), inc);
+ true, (ifp != NULL && inc), inc,NULL);
if (neigh)
neigh_release(neigh);
}
@@ -1009,6 +1100,114 @@
return;
}
+static void ndisc_recv_dar(struct sk_buff *skb)
+{
+ struct darc_msg *msg = (struct darc_msg *)skb_transport_header(skb);//icmpv6 header pointer
+ const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; //source ipv6 address
+ const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; //destination ipv6 address
+ const struct in6_addr *reg_addr = &msg->reg_addr;
+
+ struct inet6_dev *idev; //ipv6 specific information
+
+ struct neighbour *neigh;
+
+ struct net_device *dev = skb->dev; //netdevice ieee802154 interface
+
+ /*Network Device is not related to Ieee802.15.4 device */
+ if (dev->type != ARPHRD_IEEE802154)
+ return ;
+
+ /* if skb is too short */
+ if (skb->len < sizeof(struct darc_msg))
+ return ;
+
+ idev = in6_dev_get(skb->dev);
+ if (!idev) {
+ ND_PRINTK(1, err, "DAR: can't find in6 device\n");
+ return;
+ }
+ /* dont accept DAR if you are not router mode*/
+ if (!idev->cnf.forwarding)
+ return ;
+
+ /* registered address should not be multicast address : RFC6775 */
+ if (ipv6_addr_is_multicast(reg_addr)) {
+ ND_PRINTK(2,warn,"DAR : registered address is multicast\n");
+ return;
+ }
+
+ /*status in the DAR must be zero */
+ if (msg->status != 0)
+ return;
+
+ /*lookup in the neighbour table i.e NC */
+ neigh = neigh_lookup(&nd_tbl,reg_addr,dev);
+
+ if (neigh) {
+ if (memcmp(neigh->ha,msg->eui_64,8) == 0) {
+ //FIXME:update registration life time
+ msg->status = 0;
+ }
+ else
+ msg->status = 1;
+ }
+ else {
+ neigh = neigh_create(&nd_tbl,reg_addr,dev);
+ if (neigh) {
+ neigh_update(neigh,msg->eui_64,NUD_STALE,0);
+ msg->status = 0;
+ }
+ }
+ ndisc_send_dac(dev,neigh,saddr,daddr,msg);
+}
+
+static void ndisc_recv_dac(struct sk_buff *skb)
+{
+ struct inet6_dev *idev;
+ struct net_device *dev=skb->dev;
+
+ idev = in6_dev_get(skb->dev);
+ if (!idev) {
+ ND_PRINTK(1, err, "DAC: can't find in6 device\n");
+ return;
+ }
+ /* dont accept DAC if you are in router mode*/
+ if (idev->cnf.forwarding)
+ return ;
+
+ if (dev->type != ARPHRD_IEEE802154)
+ return;
+
+}
+void ndisc_send_dac(struct net_device *dev,struct neighbour *neigh,
+ const struct in6_addr *daddr,const struct in6_addr *src_addr,
+ struct darc_msg *rmsg)
+{
+ struct sk_buff *skb;
+ struct darc_msg *cmsg;
+
+ if (daddr == NULL) {
+ ND_PRINTK(2,warn,"DAC: Undefined destination address\n");
+ return ;
+ }
+
+ /* allocation of socket buffer */
+ skb = ndisc_alloc_skb(dev,sizeof(*cmsg));
+ if (!skb)
+ return ;
+
+ cmsg = (struct darc_msg *)skb_put(skb,sizeof(*cmsg));
+
+ *cmsg = (struct darc_msg) *rmsg;
+ *cmsg = (struct darc_msg) {
+ .icmph = {
+ .icmp6_type = NDISC_DUPLICATE_ADDRESS_CONFIRMATION,
+ },
+ };
+
+ /*sending the packet */
+ ndisc_send_skb(skb,daddr,src_addr);
+}
static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
{
struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
@@ -1564,6 +1763,14 @@
case NDISC_REDIRECT:
ndisc_redirect_rcv(skb);
break;
+ /*Two more ICMP messages according to RFC6775*/
+ case NDISC_DUPLICATE_ADDRESS_REQUEST:
+ ndisc_recv_dar(skb);
+ break;
+
+ case NDISC_DUPLICATE_ADDRESS_CONFIRMATION:
+ ndisc_recv_dac(skb);
+ break;
}
return 0;
--- a/include/net/ndisc.h 2013-09-14 19:37:01.000000000 +0530
+++ b/include/net/ndisc.h 2013-09-23 16:14:01.000000000 +0530
@@ -11,6 +11,10 @@
#define NDISC_NEIGHBOUR_ADVERTISEMENT 136
#define NDISC_REDIRECT 137
+/* RFC6775 lowpan ND */
+#define NDISC_DUPLICATE_ADDRESS_REQUEST 157
+#define NDISC_DUPLICATE_ADDRESS_CONFIRMATION 158
+
/*
* Router type: cross-layer information from link-layer to
* IPv6 layer reported by certain link types (e.g., RFC4214).
@@ -35,6 +39,12 @@
ND_OPT_ROUTE_INFO = 24, /* RFC4191 */
ND_OPT_RDNSS = 25, /* RFC5006 */
ND_OPT_DNSSL = 31, /* RFC6106 */
+
+
+ ND_OPT_ARO = 33, /* RFC6775 */
+ ND_OPT_6CO = 34, /* RFC6775 */
+ ND_OPT_ABRO = 35, /* RFC6775 */
+
__ND_OPT_MAX
};
@@ -85,20 +95,46 @@
__u8 opt[0];
};
+/* RFC6775 Duplicate address registration message */
+struct darc_msg {
+ struct icmp6hdr icmph;
+ __u8 status;
+ __u8 reserved;
+ __u16 reg_life_time;
+ __u8 eui_64[8];
+ struct in6_addr reg_addr;
+};
+
+
struct nd_opt_hdr {
__u8 nd_opt_type;
__u8 nd_opt_len;
} __packed;
+struct aro_option {
+ struct nd_opt_hdr aro;
+ __u8 status;
+ __u16 reserved;
+ __u16 reg_lifetime;
+ __u8 eui_64[8];
+};
+
/* ND options */
struct ndisc_options {
struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
+
+ /* lowpan options header fields RFC6775*/
+ struct nd_opt_hdr *nd_opts_aro;
+ struct nd_opt_hdr *nd_opts_6co;
+ struct nd_opt_hdr *nd_opts_abro;
+
#ifdef CONFIG_IPV6_ROUTE_INFO
struct nd_opt_hdr *nd_opts_ri;
struct nd_opt_hdr *nd_opts_ri_end;
#endif
struct nd_opt_hdr *nd_useropts;
struct nd_opt_hdr *nd_useropts_end;
+
};
#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
@@ -190,7 +226,9 @@
}
extern int ndisc_init(void);
+extern int ndisc_late_init(void);
+extern void ndisc_late_cleanup(void);
extern void ndisc_cleanup(void);
extern int ndisc_rcv(struct sk_buff *skb);
@@ -204,10 +242,22 @@
extern void ndisc_send_rs(struct net_device *dev,
const struct in6_addr *saddr,
const struct in6_addr *daddr);
+/*extern void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
+ const struct in6_addr *daddr,
+ const struct in6_addr *solicited_addr,
+ bool router, bool solicited, bool override,
+ bool inc_opt);*/
extern void ndisc_send_redirect(struct sk_buff *skb,
const struct in6_addr *target);
+/*sending DAC : RFC6775 */
+extern void ndisc_send_dac(struct net_device *dev,
+ struct neighbour *neigh,
+ const struct in6_addr *daddr,
+ const struct in6_addr *src_addr,
+ struct darc_msg *rmsg);
+
extern int ndisc_mc_map(const struct in6_addr *addr, char *buf,
struct net_device *dev, int dir);
------------------------------------------------------------------------------
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