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233 lines
6.3 KiB
233 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* |
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* Authors: |
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* (C) 2016 Pengutronix, Alexander Aring <[email protected]> |
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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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} |
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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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