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