diff options
Diffstat (limited to 'net/6lowpan/ndisc.c')
| -rw-r--r-- | net/6lowpan/ndisc.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/net/6lowpan/ndisc.c b/net/6lowpan/ndisc.c new file mode 100644 index 000000000000..86450b7e2899 --- /dev/null +++ b/net/6lowpan/ndisc.c @@ -0,0 +1,241 @@ +/* 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) +{ + 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; + } +} + +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); + } 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; + } 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; +} + +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 +}; |