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Release 4.17 net/6lowpan/ndisc.c

Directory: net/6lowpan
/* 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; }

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#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; } }

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static int lowpan_ndisc_parse_options(const struct net_device *dev, struct nd_opt_hdr *nd_opt, struct ndisc_options *ndopts) { if (!lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154)) return 0; 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; } }

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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); if (!lowpan_802154_is_valid_src_short_addr(neigh->short_addr)) neigh->short_addr = cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC); } write_unlock_bh(&n->lock); }

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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); }

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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; } else { 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; }

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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); } }

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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); } }

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#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 };

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Directory: net/6lowpan
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