From patchwork Thu Apr 7 18:54:21 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Aring X-Patchwork-Id: 8776131 Return-Path: X-Original-To: patchwork-linux-wpan@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id DE511C0553 for ; Thu, 7 Apr 2016 18:55:05 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1238320222 for ; Thu, 7 Apr 2016 18:55:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 42E33201D3 for ; Thu, 7 Apr 2016 18:55:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757441AbcDGSyl (ORCPT ); Thu, 7 Apr 2016 14:54:41 -0400 Received: from metis.ext.4.pengutronix.de ([92.198.50.35]:57005 "EHLO metis.ext.4.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757455AbcDGSyj (ORCPT ); Thu, 7 Apr 2016 14:54:39 -0400 Received: from gallifrey.ext.pengutronix.de ([2001:67c:670:201:5054:ff:fe8d:eefb] helo=omega.localdomain) by metis.ext.pengutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1aoF4f-0003du-P0; Thu, 07 Apr 2016 20:54:37 +0200 From: Alexander Aring To: linux-wpan@vger.kernel.org Cc: kernel@pengutronix.de, jukka.rissanen@linux.intel.com, hannes@stressinduktion.org, stefan@osg.samsung.com, mcr@sandelman.ca, werner@almesberger.net, Alexander Aring Subject: [RFCv2 bluetooth-next 20/21] 6lowpan: introduce 6lowpan-nd Date: Thu, 7 Apr 2016 20:54:21 +0200 Message-Id: <1460055262-4330-21-git-send-email-aar@pengutronix.de> X-Mailer: git-send-email 2.8.0 In-Reply-To: <1460055262-4330-1-git-send-email-aar@pengutronix.de> References: <1460055262-4330-1-git-send-email-aar@pengutronix.de> X-SA-Exim-Connect-IP: 2001:67c:670:201:5054:ff:fe8d:eefb X-SA-Exim-Mail-From: aar@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-wpan@vger.kernel.org Sender: linux-wpan-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wpan@vger.kernel.org X-Spam-Status: No, score=-7.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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. Future handling: Also add RS/RA(processing) for 802.15.4 short addresses and handle RFC6775, which requires more 6lowpan specific handling for ipv6 neighbour discovery implementation. Signed-off-by: Alexander Aring --- include/net/ndisc.h | 1 + net/6lowpan/6lowpan_i.h | 2 + net/6lowpan/Makefile | 2 +- net/6lowpan/core.c | 2 + net/6lowpan/ndisc.c | 631 ++++++++++++++++++++++++++++++++++++++++++++++++ net/ipv6/ndisc.c | 3 + 6 files changed, 640 insertions(+), 1 deletion(-) create mode 100644 net/6lowpan/ndisc.c diff --git a/include/net/ndisc.h b/include/net/ndisc.h index c1838ae..ab87f43 100644 --- a/include/net/ndisc.h +++ b/include/net/ndisc.h @@ -35,6 +35,7 @@ enum { ND_OPT_ROUTE_INFO = 24, /* RFC4191 */ ND_OPT_RDNSS = 25, /* RFC5006 */ ND_OPT_DNSSL = 31, /* RFC6106 */ + ND_OPT_6CO = 34, /* RFC6775 */ __ND_OPT_MAX }; diff --git a/net/6lowpan/6lowpan_i.h b/net/6lowpan/6lowpan_i.h index 97ecc27..8b01774 100644 --- a/net/6lowpan/6lowpan_i.h +++ b/net/6lowpan/6lowpan_i.h @@ -12,6 +12,8 @@ static inline bool lowpan_is_ll(const struct net_device *dev, return lowpan_dev(dev)->lltype == lltype; } +void lowpan_register_ndisc_ops(struct net_device *dev); + #ifdef CONFIG_6LOWPAN_DEBUGFS int lowpan_dev_debugfs_init(struct net_device *dev); void lowpan_dev_debugfs_exit(struct net_device *dev); diff --git a/net/6lowpan/Makefile b/net/6lowpan/Makefile index e44f3bf..12d131a 100644 --- a/net/6lowpan/Makefile +++ b/net/6lowpan/Makefile @@ -1,6 +1,6 @@ obj-$(CONFIG_6LOWPAN) += 6lowpan.o -6lowpan-y := core.o iphc.o nhc.o +6lowpan-y := core.o iphc.o nhc.o ndisc.o 6lowpan-$(CONFIG_6LOWPAN_DEBUGFS) += debugfs.o #rfc6282 nhcs diff --git a/net/6lowpan/core.c b/net/6lowpan/core.c index 824d1bc..e7a370e 100644 --- a/net/6lowpan/core.c +++ b/net/6lowpan/core.c @@ -34,6 +34,8 @@ int lowpan_register_netdevice(struct net_device *dev, for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++) lowpan_dev(dev)->ctx.table[i].id = i; + lowpan_register_ndisc_ops(dev); + ret = register_netdevice(dev); if (ret < 0) return ret; diff --git a/net/6lowpan/ndisc.c b/net/6lowpan/ndisc.c new file mode 100644 index 0000000..0deb287 --- /dev/null +++ b/net/6lowpan/ndisc.c @@ -0,0 +1,631 @@ +/* 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. + */ + +#include +#include +#include +#include + +#include "6lowpan_i.h" + +struct lowpan_ndisc_options { + struct nd_opt_hdr *nd_opt_array[ND_OPT_TARGET_LL_ADDR + 1]; +#ifdef CONFIG_IEEE802154_6LOWPAN + struct nd_opt_hdr *nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR + 1]; +#endif +}; + +#define nd_802154_opts_src_lladdr nd_802154_opt_array[ND_OPT_SOURCE_LL_ADDR] +#define nd_802154_opts_tgt_lladdr nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR] + +#define NDISC_802154_EXTENDED_ADDR_LENGTH 2 +#define NDISC_802154_SHORT_ADDR_LENGTH 1 + +#ifdef CONFIG_IEEE802154_6LOWPAN +static void lowpan_ndisc_802154_neigh_update(struct neighbour *n, void *priv, + bool override) +{ + struct lowpan_802154_neigh *neigh = lowpan_802154_neigh(neighbour_priv(n)); + + if (!override) + return; + + write_lock_bh(&n->lock); + if (priv) + ieee802154_be16_to_le16(&neigh->short_addr, priv); + else + neigh->short_addr = cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC); + write_unlock_bh(&n->lock); +} + +static inline int lowpan_ndisc_802154_short_addr_space(struct net_device *dev) +{ + struct wpan_dev *wpan_dev; + int addr_space = 0; + + if (lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154)) { + wpan_dev = lowpan_802154_dev(dev)->wdev->ieee802154_ptr; + + if (ieee802154_is_valid_src_short_addr(wpan_dev->short_addr)) + addr_space = ndisc_opt_addr_space(dev, IEEE802154_SHORT_ADDR_LEN); + } + + return addr_space; +} + +static inline void +lowpan_ndisc_802154_short_addr_option(struct net_device *dev, + struct sk_buff *skb, int type) +{ + struct wpan_dev *wpan_dev; + __be16 short_addr; + + if (lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154)) { + wpan_dev = lowpan_802154_dev(dev)->wdev->ieee802154_ptr; + + if (ieee802154_is_valid_src_short_addr(wpan_dev->short_addr)) { + ieee802154_le16_to_be16(&short_addr, + &wpan_dev->short_addr); + ndisc_fill_addr_option(skb, type, &short_addr, + IEEE802154_SHORT_ADDR_LEN); + } + } +} +#else +static void +lowpan_ndisc_802154_neigh_update(struct neighbour *n, void *priv) { } + +static inline void +lowpan_ndisc_802154_short_addr_option(struct net_device *dev, + struct sk_buff *skb, + int type) { } + +static inline int lowpan_ndisc_802154_short_addr_space(struct net_device *dev) +{ + return 0; +} +#endif + +static void lowpan_ndisc_parse_addr_options(const struct net_device *dev, + struct lowpan_ndisc_options *ndopts, + struct nd_opt_hdr *nd_opt) +{ + switch (nd_opt->nd_opt_len) { + case NDISC_802154_EXTENDED_ADDR_LENGTH: + if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) + ND_PRINTK(2, warn, + "%s: duplicated extended addr ND6 option found: type=%d\n", + __func__, nd_opt->nd_opt_type); + else + ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; + break; +#ifdef CONFIG_IEEE802154_6LOWPAN + case NDISC_802154_SHORT_ADDR_LENGTH: + /* only valid on 802.15.4 */ + if (!lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154)) { + ND_PRINTK(2, warn, + "%s: invalid length detected: type=%d\n", + __func__, nd_opt->nd_opt_type); + break; + } + + 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; + break; +#endif + default: + ND_PRINTK(2, warn, + "%s: invalid length detected: type=%d\n", + __func__, nd_opt->nd_opt_type); + break; + } +} + +static struct lowpan_ndisc_options * +lowpan_ndisc_parse_options(const struct net_device *dev, u8 *opt, int opt_len, + struct lowpan_ndisc_options *ndopts) +{ + struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; + + if (!nd_opt || opt_len < 0 || !ndopts) + return NULL; + memset(ndopts, 0, sizeof(*ndopts)); + while (opt_len) { + int l; + if (opt_len < sizeof(struct nd_opt_hdr)) + return NULL; + l = nd_opt->nd_opt_len << 3; + if (opt_len < l || l == 0) + return NULL; + switch (nd_opt->nd_opt_type) { + case ND_OPT_SOURCE_LL_ADDR: + case ND_OPT_TARGET_LL_ADDR: + lowpan_ndisc_parse_addr_options(dev, ndopts, nd_opt); + break; + default: + /* + * Unknown options must be silently ignored, + * to accommodate future extension to the + * protocol. + */ + ND_PRINTK(2, notice, + "%s: ignored unsupported option; type=%d, len=%d\n", + __func__, + nd_opt->nd_opt_type, + nd_opt->nd_opt_len); + } + opt_len -= l; + nd_opt = ((void *)nd_opt) + l; + } + return ndopts; +} + +static void lowpan_ndisc_send_na(struct net_device *dev, + const struct in6_addr *daddr, + const struct in6_addr *solicited_addr, + bool router, bool solicited, bool override, + bool inc_opt) +{ + struct sk_buff *skb; + struct in6_addr tmpaddr; + struct inet6_ifaddr *ifp; + const struct in6_addr *src_addr; + struct nd_msg *msg; + int optlen = 0; + + /* for anycast or proxy, solicited_addr != src_addr */ + ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); + if (ifp) { + src_addr = solicited_addr; + if (ifp->flags & IFA_F_OPTIMISTIC) + override = false; + inc_opt |= ifp->idev->cnf.force_tllao; + in6_ifa_put(ifp); + } else { + if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, + inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, + &tmpaddr)) + return; + src_addr = &tmpaddr; + } + + if (!dev->addr_len) + inc_opt = 0; + if (inc_opt) { + optlen += ndisc_opt_addr_space(dev, dev->addr_len); + optlen += lowpan_ndisc_802154_short_addr_space(dev); + } + + skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); + if (!skb) + return; + + msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); + *msg = (struct nd_msg) { + .icmph = { + .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, + .icmp6_router = router, + .icmp6_solicited = solicited, + .icmp6_override = override, + }, + .target = *solicited_addr, + }; + + if (inc_opt) { + ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, + dev->dev_addr, dev->addr_len); + lowpan_ndisc_802154_short_addr_option(dev, skb, + ND_OPT_TARGET_LL_ADDR); + } + + + ndisc_send_skb(skb, daddr, src_addr); +} + +static void lowpan_ndisc_recv_na(struct sk_buff *skb) +{ + struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); + struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; + const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; + u8 *lladdr = NULL; + u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + + offsetof(struct nd_msg, opt)); + struct lowpan_ndisc_options ndopts; + struct net_device *dev = skb->dev; + struct inet6_dev *idev = __in6_dev_get(dev); + struct inet6_ifaddr *ifp; + struct neighbour *neigh; + u8 *lladdr_short = NULL; + + if (skb->len < sizeof(struct nd_msg)) { + ND_PRINTK(2, warn, "NA: packet too short\n"); + return; + } + + if (ipv6_addr_is_multicast(&msg->target)) { + ND_PRINTK(2, warn, "NA: target address is multicast\n"); + return; + } + + if (ipv6_addr_is_multicast(daddr) && + msg->icmph.icmp6_solicited) { + ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); + return; + } + + /* For some 802.11 wireless deployments (and possibly other networks), + * there will be a NA proxy and unsolicitd packets are attacks + * and thus should not be accepted. + */ + if (!msg->icmph.icmp6_solicited && idev && + idev->cnf.drop_unsolicited_na) + return; + + if (!lowpan_ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) { + ND_PRINTK(2, warn, "NS: invalid ND option\n"); + return; + } + if (ndopts.nd_opts_tgt_lladdr) { + lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev, + dev->addr_len); + if (!lladdr) { + ND_PRINTK(2, warn, + "NA: invalid link-layer address length\n"); + return; + } + } +#ifdef CONFIG_IEEE802154_6LOWPAN + if (lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154) && + ndopts.nd_802154_opts_tgt_lladdr) { + lladdr_short = ndisc_opt_addr_data(ndopts.nd_802154_opts_tgt_lladdr, + dev, IEEE802154_SHORT_ADDR_LEN); + if (!lladdr_short) { + ND_PRINTK(2, warn, + "NA: invalid short link-layer address length\n"); + return; + } + } +#endif + ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); + if (ifp) { + if (skb->pkt_type != PACKET_LOOPBACK + && (ifp->flags & IFA_F_TENTATIVE)) { + addrconf_dad_failure(ifp); + return; + } + /* What should we make now? The advertisement + is invalid, but ndisc specs say nothing + about it. It could be misconfiguration, or + an smart proxy agent tries to help us :-) + + We should not print the error if NA has been + received from loopback - it is just our own + unsolicited advertisement. + */ + if (skb->pkt_type != PACKET_LOOPBACK) + ND_PRINTK(1, warn, + "NA: someone advertises our address %pI6 on %s!\n", + &ifp->addr, ifp->idev->dev->name); + in6_ifa_put(ifp); + return; + } + neigh = neigh_lookup(&nd_tbl, &msg->target, dev); + + if (neigh) { + u8 old_flags = neigh->flags; + struct net *net = dev_net(dev); + + if (neigh->nud_state & NUD_FAILED) + goto out; + + /* + * Don't update the neighbor cache entry on a proxy NA from + * ourselves because either the proxied node is off link or it + * has already sent a NA to us. + */ + if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && + net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && + pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { + /* XXX: idev->cnf.proxy_ndp */ + goto out; + } + + neigh_update(neigh, lladdr, + msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, + NEIGH_UPDATE_F_WEAK_OVERRIDE| + (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| + NEIGH_UPDATE_F_OVERRIDE_ISROUTER| + (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); + + if (lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154)) + lowpan_ndisc_802154_neigh_update(neigh, lladdr_short, + msg->icmph.icmp6_override); + + if ((old_flags & ~neigh->flags) & NTF_ROUTER) { + /* + * Change: router to host + */ + rt6_clean_tohost(dev_net(dev), saddr); + } + +out: + neigh_release(neigh); + } +} + +static void lowpan_ndisc_send_ns(struct net_device *dev, + const struct in6_addr *solicit, + const struct in6_addr *daddr, + const struct in6_addr *saddr) +{ + struct sk_buff *skb; + struct in6_addr addr_buf; + int inc_opt = dev->addr_len; + int optlen = 0; + struct nd_msg *msg; + + if (!saddr) { + if (ipv6_get_lladdr(dev, &addr_buf, + (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) + return; + saddr = &addr_buf; + } + + if (ipv6_addr_any(saddr)) + inc_opt = false; + if (inc_opt) { + optlen += ndisc_opt_addr_space(dev, dev->addr_len); + optlen += lowpan_ndisc_802154_short_addr_space(dev); + } + + skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); + if (!skb) + return; + + msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); + *msg = (struct nd_msg) { + .icmph = { + .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, + }, + .target = *solicit, + }; + + if (inc_opt) { + ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, + dev->dev_addr, dev->addr_len); + lowpan_ndisc_802154_short_addr_option(dev, skb, + ND_OPT_SOURCE_LL_ADDR); + } + + ndisc_send_skb(skb, daddr, saddr); +} + +static void lowpan_ndisc_recv_ns(struct sk_buff *skb) +{ + struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); + const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; + const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; + u8 *lladdr = NULL; + u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + + offsetof(struct nd_msg, opt)); + struct lowpan_ndisc_options ndopts; + struct net_device *dev = skb->dev; + struct inet6_ifaddr *ifp; + struct inet6_dev *idev = NULL; + struct neighbour *neigh; + int dad = ipv6_addr_any(saddr); + bool inc; + int is_router = -1; + u8 *lladdr_short = NULL; + + if (skb->len < sizeof(struct nd_msg)) { + ND_PRINTK(2, warn, "NS: packet too short\n"); + return; + } + + if (ipv6_addr_is_multicast(&msg->target)) { + ND_PRINTK(2, warn, "NS: multicast target address\n"); + return; + } + + /* + * RFC2461 7.1.1: + * DAD has to be destined for solicited node multicast address. + */ + if (dad && !ipv6_addr_is_solict_mult(daddr)) { + ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); + return; + } + + if (!lowpan_ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) { + ND_PRINTK(2, warn, "NS: invalid ND options\n"); + return; + } + + if (ndopts.nd_opts_src_lladdr) { + lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev, + dev->addr_len); + if (!lladdr) { + ND_PRINTK(2, warn, + "NS: invalid link-layer address length\n"); + return; + } + + /* RFC2461 7.1.1: + * If the IP source address is the unspecified address, + * there MUST NOT be source link-layer address option + * in the message. + */ + if (dad) { + ND_PRINTK(2, warn, + "NS: bad DAD packet (link-layer address option)\n"); + return; + } + } + +#ifdef CONFIG_IEEE802154_6LOWPAN + if (lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154) && + ndopts.nd_802154_opts_src_lladdr) { + lladdr_short = ndisc_opt_addr_data(ndopts.nd_802154_opts_src_lladdr, + dev, IEEE802154_SHORT_ADDR_LEN); + if (!lladdr_short) { + ND_PRINTK(2, warn, + "NS: invalid short link-layer address length\n"); + return; + } + + /* RFC2461 7.1.1: + * If the IP source address is the unspecified address, + * there MUST NOT be source link-layer address option + * in the message. + */ + if (dad) { + ND_PRINTK(2, warn, + "NS: bad DAD packet (short link-layer address option)\n"); + return; + } + } +#endif + + inc = ipv6_addr_is_multicast(daddr); + + ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); + if (ifp) { +have_ifp: + if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { + if (dad) { + /* + * We are colliding with another node + * who is doing DAD + * so fail our DAD process + */ + addrconf_dad_failure(ifp); + return; + } else { + /* + * This is not a dad solicitation. + * If we are an optimistic node, + * we should respond. + * Otherwise, we should ignore it. + */ + if (!(ifp->flags & IFA_F_OPTIMISTIC)) + goto out; + } + } + + idev = ifp->idev; + } else { + struct net *net = dev_net(dev); + + /* perhaps an address on the master device */ + if (netif_is_l3_slave(dev)) { + struct net_device *mdev; + + mdev = netdev_master_upper_dev_get_rcu(dev); + if (mdev) { + ifp = ipv6_get_ifaddr(net, &msg->target, mdev, 1); + if (ifp) + goto have_ifp; + } + } + + idev = in6_dev_get(dev); + if (!idev) { + /* XXX: count this drop? */ + return; + } + + if (ipv6_chk_acast_addr(net, dev, &msg->target) || + (idev->cnf.forwarding && + (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && + (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { + if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && + skb->pkt_type != PACKET_HOST && + inc && + NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) { + /* + * for anycast or proxy, + * sender should delay its response + * by a random time between 0 and + * MAX_ANYCAST_DELAY_TIME seconds. + * (RFC2461) -- yoshfuji + */ + struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); + if (n) + pneigh_enqueue(&nd_tbl, idev->nd_parms, n); + goto out; + } + } else + goto out; + } + + if (is_router < 0) + is_router = idev->cnf.forwarding; + + if (dad) { + ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target, + !!is_router, false, (ifp != NULL), true); + goto out; + } + + if (inc) + NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); + else + NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); + + /* + * update / create cache entry + * for the source address + */ + neigh = __neigh_lookup(&nd_tbl, saddr, dev, + !inc || lladdr || !dev->addr_len); + if (neigh) { + neigh_update(neigh, lladdr, NUD_STALE, + NEIGH_UPDATE_F_WEAK_OVERRIDE| + NEIGH_UPDATE_F_OVERRIDE); + if (lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154)) + lowpan_ndisc_802154_neigh_update(neigh, lladdr_short, + true); + } + if (neigh || !dev->header_ops) { + ndisc_send_na(dev, saddr, &msg->target, !!is_router, + true, (ifp != NULL && inc), inc); + if (neigh) + neigh_release(neigh); + } + +out: + if (ifp) + in6_ifa_put(ifp); + else + in6_dev_put(idev); +} + +static inline int lowpan_ndisc_is_useropt(struct nd_opt_hdr *opt) +{ + return __ip6_ndisc_is_useropt(opt) || opt->nd_opt_type == ND_OPT_6CO; +} + +static const struct ndisc_ops lowpan_ndisc_ops = { + .is_useropt = lowpan_ndisc_is_useropt, + .send_na = lowpan_ndisc_send_na, + .recv_na = lowpan_ndisc_recv_na, + .send_ns = lowpan_ndisc_send_ns, + .recv_ns = lowpan_ndisc_recv_ns, +}; + +void lowpan_register_ndisc_ops(struct net_device *dev) +{ + dev->ndisc_ops = &lowpan_ndisc_ops; +} diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index dc8bfec..9d7f228 100644 --- a/net/ipv6/ndisc.c +++ b/net/ipv6/ndisc.c @@ -1792,6 +1792,9 @@ static const struct ndisc_ops ip6_ndisc_ops = { void ip6_register_ndisc_ops(struct net_device *dev) { switch (dev->type) { + case ARPHRD_6LOWPAN: + /* will be assigned while lowpan interface register */ + break; default: if (dev->ndisc_ops) { ND_PRINTK(2, warn,