235 lines
6.5 KiB
C
235 lines
6.5 KiB
C
/* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* Authors:
|
|
* (C) 2016 Pengutronix, Alexander Aring <aar@pengutronix.de>
|
|
*/
|
|
|
|
#include <net/6lowpan.h>
|
|
#include <net/addrconf.h>
|
|
#include <net/ndisc.h>
|
|
|
|
#include "6lowpan_i.h"
|
|
|
|
static int lowpan_ndisc_is_useropt(u8 nd_opt_type)
|
|
{
|
|
return nd_opt_type == ND_OPT_6CO;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
|
|
#define NDISC_802154_SHORT_ADDR_LENGTH 1
|
|
static int lowpan_ndisc_parse_802154_options(const struct net_device *dev,
|
|
struct nd_opt_hdr *nd_opt,
|
|
struct ndisc_options *ndopts)
|
|
{
|
|
switch (nd_opt->nd_opt_len) {
|
|
case NDISC_802154_SHORT_ADDR_LENGTH:
|
|
if (ndopts->nd_802154_opt_array[nd_opt->nd_opt_type])
|
|
ND_PRINTK(2, warn,
|
|
"%s: duplicated short addr ND6 option found: type=%d\n",
|
|
__func__, nd_opt->nd_opt_type);
|
|
else
|
|
ndopts->nd_802154_opt_array[nd_opt->nd_opt_type] = nd_opt;
|
|
return 1;
|
|
default:
|
|
/* all others will be handled by ndisc IPv6 option parsing */
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int lowpan_ndisc_parse_options(const struct net_device *dev,
|
|
struct nd_opt_hdr *nd_opt,
|
|
struct ndisc_options *ndopts)
|
|
{
|
|
switch (nd_opt->nd_opt_type) {
|
|
case ND_OPT_SOURCE_LL_ADDR:
|
|
case ND_OPT_TARGET_LL_ADDR:
|
|
return lowpan_ndisc_parse_802154_options(dev, nd_opt, ndopts);
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static void lowpan_ndisc_802154_update(struct neighbour *n, u32 flags,
|
|
u8 icmp6_type,
|
|
const struct ndisc_options *ndopts)
|
|
{
|
|
struct lowpan_802154_neigh *neigh = lowpan_802154_neigh(neighbour_priv(n));
|
|
u8 *lladdr_short = NULL;
|
|
|
|
switch (icmp6_type) {
|
|
case NDISC_ROUTER_SOLICITATION:
|
|
case NDISC_ROUTER_ADVERTISEMENT:
|
|
case NDISC_NEIGHBOUR_SOLICITATION:
|
|
if (ndopts->nd_802154_opts_src_lladdr) {
|
|
lladdr_short = __ndisc_opt_addr_data(ndopts->nd_802154_opts_src_lladdr,
|
|
IEEE802154_SHORT_ADDR_LEN, 0);
|
|
if (!lladdr_short) {
|
|
ND_PRINTK(2, warn,
|
|
"NA: invalid short link-layer address length\n");
|
|
return;
|
|
}
|
|
}
|
|
break;
|
|
case NDISC_REDIRECT:
|
|
case NDISC_NEIGHBOUR_ADVERTISEMENT:
|
|
if (ndopts->nd_802154_opts_tgt_lladdr) {
|
|
lladdr_short = __ndisc_opt_addr_data(ndopts->nd_802154_opts_tgt_lladdr,
|
|
IEEE802154_SHORT_ADDR_LEN, 0);
|
|
if (!lladdr_short) {
|
|
ND_PRINTK(2, warn,
|
|
"NA: invalid short link-layer address length\n");
|
|
return;
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
write_lock_bh(&n->lock);
|
|
if (lladdr_short)
|
|
ieee802154_be16_to_le16(&neigh->short_addr, lladdr_short);
|
|
else
|
|
neigh->short_addr = cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC);
|
|
write_unlock_bh(&n->lock);
|
|
}
|
|
|
|
static void lowpan_ndisc_update(const struct net_device *dev,
|
|
struct neighbour *n, u32 flags, u8 icmp6_type,
|
|
const struct ndisc_options *ndopts)
|
|
{
|
|
if (!lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154))
|
|
return;
|
|
|
|
/* react on overrides only. TODO check if this is really right. */
|
|
if (flags & NEIGH_UPDATE_F_OVERRIDE)
|
|
lowpan_ndisc_802154_update(n, flags, icmp6_type, ndopts);
|
|
}
|
|
|
|
static int lowpan_ndisc_opt_addr_space(const struct net_device *dev,
|
|
u8 icmp6_type, struct neighbour *neigh,
|
|
u8 *ha_buf, u8 **ha)
|
|
{
|
|
struct lowpan_802154_neigh *n;
|
|
struct wpan_dev *wpan_dev;
|
|
int addr_space = 0;
|
|
|
|
if (!lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154))
|
|
return 0;
|
|
|
|
switch (icmp6_type) {
|
|
case NDISC_REDIRECT:
|
|
n = lowpan_802154_neigh(neighbour_priv(neigh));
|
|
|
|
read_lock_bh(&neigh->lock);
|
|
if (lowpan_802154_is_valid_src_short_addr(n->short_addr)) {
|
|
memcpy(ha_buf, &n->short_addr,
|
|
IEEE802154_SHORT_ADDR_LEN);
|
|
read_unlock_bh(&neigh->lock);
|
|
addr_space += __ndisc_opt_addr_space(IEEE802154_SHORT_ADDR_LEN, 0);
|
|
*ha = ha_buf;
|
|
}
|
|
read_unlock_bh(&neigh->lock);
|
|
break;
|
|
case NDISC_NEIGHBOUR_ADVERTISEMENT:
|
|
case NDISC_NEIGHBOUR_SOLICITATION:
|
|
case NDISC_ROUTER_SOLICITATION:
|
|
wpan_dev = lowpan_802154_dev(dev)->wdev->ieee802154_ptr;
|
|
|
|
if (lowpan_802154_is_valid_src_short_addr(wpan_dev->short_addr))
|
|
addr_space = __ndisc_opt_addr_space(IEEE802154_SHORT_ADDR_LEN, 0);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return addr_space;
|
|
}
|
|
|
|
static void lowpan_ndisc_fill_addr_option(const struct net_device *dev,
|
|
struct sk_buff *skb, u8 icmp6_type,
|
|
const u8 *ha)
|
|
{
|
|
struct wpan_dev *wpan_dev;
|
|
__be16 short_addr;
|
|
u8 opt_type;
|
|
|
|
if (!lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154))
|
|
return;
|
|
|
|
switch (icmp6_type) {
|
|
case NDISC_REDIRECT:
|
|
if (ha) {
|
|
ieee802154_le16_to_be16(&short_addr, ha);
|
|
__ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR,
|
|
&short_addr,
|
|
IEEE802154_SHORT_ADDR_LEN, 0);
|
|
}
|
|
return;
|
|
case NDISC_NEIGHBOUR_ADVERTISEMENT:
|
|
opt_type = ND_OPT_TARGET_LL_ADDR;
|
|
break;
|
|
case NDISC_ROUTER_SOLICITATION:
|
|
case NDISC_NEIGHBOUR_SOLICITATION:
|
|
opt_type = ND_OPT_SOURCE_LL_ADDR;
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
|
|
wpan_dev = lowpan_802154_dev(dev)->wdev->ieee802154_ptr;
|
|
|
|
if (lowpan_802154_is_valid_src_short_addr(wpan_dev->short_addr)) {
|
|
ieee802154_le16_to_be16(&short_addr,
|
|
&wpan_dev->short_addr);
|
|
__ndisc_fill_addr_option(skb, opt_type, &short_addr,
|
|
IEEE802154_SHORT_ADDR_LEN, 0);
|
|
}
|
|
}
|
|
|
|
static void lowpan_ndisc_prefix_rcv_add_addr(struct net *net,
|
|
struct net_device *dev,
|
|
const struct prefix_info *pinfo,
|
|
struct inet6_dev *in6_dev,
|
|
struct in6_addr *addr,
|
|
int addr_type, u32 addr_flags,
|
|
bool sllao, bool tokenized,
|
|
__u32 valid_lft,
|
|
u32 prefered_lft,
|
|
bool dev_addr_generated)
|
|
{
|
|
int err;
|
|
|
|
/* generates short based address for RA PIO's */
|
|
if (lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154) && dev_addr_generated &&
|
|
!addrconf_ifid_802154_6lowpan(addr->s6_addr + 8, dev)) {
|
|
err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
|
|
addr, addr_type, addr_flags,
|
|
sllao, tokenized, valid_lft,
|
|
prefered_lft);
|
|
if (err)
|
|
ND_PRINTK(2, warn,
|
|
"RA: could not add a short address based address for prefix: %pI6c\n",
|
|
&pinfo->prefix);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
const struct ndisc_ops lowpan_ndisc_ops = {
|
|
.is_useropt = lowpan_ndisc_is_useropt,
|
|
#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
|
|
.parse_options = lowpan_ndisc_parse_options,
|
|
.update = lowpan_ndisc_update,
|
|
.opt_addr_space = lowpan_ndisc_opt_addr_space,
|
|
.fill_addr_option = lowpan_ndisc_fill_addr_option,
|
|
.prefix_rcv_add_addr = lowpan_ndisc_prefix_rcv_add_addr,
|
|
#endif
|
|
};
|