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This patch introduce different 6lowpan handling for receive and transmit NS/NA messages for the ipv6 neighbour discovery. The first use-case is for supporting 802.15.4 short addresses inside the option fields and handling for RFC6775 6CO option field as userspace option. Cc: David S. Miller <[email protected]> Cc: Alexey Kuznetsov <[email protected]> Cc: James Morris <[email protected]> Cc: Hideaki YOSHIFUJI <[email protected]> Cc: Patrick McHardy <[email protected]> Reviewed-by: Stefan Schmidt <[email protected]> Acked-by: YOSHIFUJI Hideaki <[email protected]> Signed-off-by: Alexander Aring <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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|---|---|---|
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| /* 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 <[email protected]> | ||
| */ | ||
|
|
||
| #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; | ||
| } | ||
|
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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); | ||
| } | ||
| } | ||
|
|
||
| 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 | ||
| }; |