Commit message: ipv6: Don't reduce hop limit for an interface

A local route may have a lower hop_limit set than global routes do.

RFC 3756, Section 4.2.7, "Parameter Spoofing"

>   1.  The attacker includes a Current Hop Limit of one or another small
>       number which the attacker knows will cause legitimate packets to
>       be dropped before they reach their destination.

>   As an example, one possible approach to mitigate this threat is to
>   ignore very small hop limits.  The nodes could implement a
>   configurable minimum hop limit, and ignore attempts to set it below
>   said limit.

Signed-off-by: D.S. Ljungmark <ljungmark@modio.se>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
CVE: CVE-2015-2922
CWE: CWE-17
Vulnerability description: The ndisc_router_discovery function in net/ipv6/ndisc.c in the Neighbor Discovery (ND) protocol implementation in the IPv6 stack in the Linux kernel before 3.19.6 allows remote attackers to reconfigure a hop-limit setting via a small hop_limit value in a Router Advertisement (RA) message.

Project: linux
File: ndisc.c

static void ip6_nd_hdr(struct sk_buff *skb,
		       const struct in6_addr *saddr,
		       const struct in6_addr *daddr,
		       int hop_limit, int len)
{
	struct ipv6hdr *hdr;

	skb_push(skb, sizeof(*hdr));
	skb_reset_network_header(skb);
	hdr = ipv6_hdr(skb);

	ip6_flow_hdr(hdr, 0, 0);

	hdr->payload_len = htons(len);
	hdr->nexthdr = IPPROTO_ICMPV6;
	hdr->hop_limit = hop_limit;

	hdr->saddr = *saddr;
	hdr->daddr = *daddr;
}

Project: linux
File: ndisc.c

static struct sk_buff *ndisc_alloc_skb(struct net_device *dev,
				       int len)
{
	int hlen = LL_RESERVED_SPACE(dev);
	int tlen = dev->needed_tailroom;
	struct sock *sk = dev_net(dev)->ipv6.ndisc_sk;
	struct sk_buff *skb;

	skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC);
	if (!skb) {
		ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n",
			  __func__);
		return NULL;
	}

	skb->protocol = htons(ETH_P_IPV6);
	skb->dev = dev;

	skb_reserve(skb, hlen + sizeof(struct ipv6hdr));
	skb_reset_transport_header(skb);

	/* Manually assign socket ownership as we avoid calling
	 * sock_alloc_send_pskb() to bypass wmem buffer limits
	 */
	skb_set_owner_w(skb, sk);

	return skb;
}

Project: linux
File: ndisc.c

void ndisc_cleanup(void)
{
#ifdef CONFIG_SYSCTL
	neigh_sysctl_unregister(&nd_tbl.parms);
#endif
	neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl);
	unregister_pernet_subsys(&ndisc_net_ops);
}

Project: linux
File: ndisc.c

static int ndisc_constructor(struct neighbour *neigh)
{
	struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key;
	struct net_device *dev = neigh->dev;
	struct inet6_dev *in6_dev;
	struct neigh_parms *parms;
	bool is_multicast = ipv6_addr_is_multicast(addr);

	in6_dev = in6_dev_get(dev);
	if (in6_dev == NULL) {
		return -EINVAL;
	}

	parms = in6_dev->nd_parms;
	__neigh_parms_put(neigh->parms);
	neigh->parms = neigh_parms_clone(parms);

	neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
	if (!dev->header_ops) {
		neigh->nud_state = NUD_NOARP;
		neigh->ops = &ndisc_direct_ops;
		neigh->output = neigh_direct_output;
	} else {
		if (is_multicast) {
			neigh->nud_state = NUD_NOARP;
			ndisc_mc_map(addr, neigh->ha, dev, 1);
		} else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
			neigh->nud_state = NUD_NOARP;
			memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
			if (dev->flags&IFF_LOOPBACK)
				neigh->type = RTN_LOCAL;
		} else if (dev->flags&IFF_POINTOPOINT) {
			neigh->nud_state = NUD_NOARP;
			memcpy(neigh->ha, dev->broadcast, dev->addr_len);
		}
		if (dev->header_ops->cache)
			neigh->ops = &ndisc_hh_ops;
		else
			neigh->ops = &ndisc_generic_ops;
		if (neigh->nud_state&NUD_VALID)
			neigh->output = neigh->ops->connected_output;
		else
			neigh->output = neigh->ops->output;
	}
	in6_dev_put(in6_dev);
	return 0;
}

Project: linux
File: ndisc.c

static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
{
	/*
	 *	"The sender MUST return an ICMP
	 *	 destination unreachable"
	 */
	dst_link_failure(skb);
	kfree_skb(skb);
}

Project: linux
File: ndisc.c

static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb,
					   struct sk_buff *orig_skb,
					   int rd_len)
{
	u8 *opt = skb_put(skb, rd_len);

	memset(opt, 0, 8);
	*(opt++) = ND_OPT_REDIRECT_HDR;
	*(opt++) = (rd_len >> 3);
	opt += 6;

	memcpy(opt, ipv6_hdr(orig_skb), rd_len - 8);
}

Project: linux
File: ndisc.c

int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos)
{
	struct net_device *dev = ctl->extra1;
	struct inet6_dev *idev;
	int ret;

	if ((strcmp(ctl->procname, "retrans_time") == 0) ||
	    (strcmp(ctl->procname, "base_reachable_time") == 0))
		ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default");

	if (strcmp(ctl->procname, "retrans_time") == 0)
		ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos);

	else if (strcmp(ctl->procname, "base_reachable_time") == 0)
		ret = neigh_proc_dointvec_jiffies(ctl, write,
						  buffer, lenp, ppos);

	else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) ||
		 (strcmp(ctl->procname, "base_reachable_time_ms") == 0))
		ret = neigh_proc_dointvec_ms_jiffies(ctl, write,
						     buffer, lenp, ppos);
	else
		ret = -1;

	if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) {
		if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME))
			idev->nd_parms->reachable_time =
					neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME));
		idev->tstamp = jiffies;
		inet6_ifinfo_notify(RTM_NEWLINK, idev);
		in6_dev_put(idev);
	}
	return ret;
}

Project: linux
File: ndisc.c

int __init ndisc_init(void)
{
	int err;

	err = register_pernet_subsys(&ndisc_net_ops);
	if (err)
		return err;
	/*
	 * Initialize the neighbour table
	 */
	neigh_table_init(NEIGH_ND_TABLE, &nd_tbl);

#ifdef CONFIG_SYSCTL
	err = neigh_sysctl_register(NULL, &nd_tbl.parms,
				    ndisc_ifinfo_sysctl_change);
	if (err)
		goto out_unregister_pernet;
out:
#endif
	return err;

#ifdef CONFIG_SYSCTL
out_unregister_pernet:
	unregister_pernet_subsys(&ndisc_net_ops);
	goto out;
#endif
}

Project: linux
File: ndisc.c

void ndisc_late_cleanup(void)
{
	unregister_netdevice_notifier(&ndisc_netdev_notifier);
}

Project: linux
File: ndisc.c

int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
{
	switch (dev->type) {
	case ARPHRD_ETHER:
	case ARPHRD_IEEE802:	/* Not sure. Check it later. --ANK */
	case ARPHRD_FDDI:
		ipv6_eth_mc_map(addr, buf);
		return 0;
	case ARPHRD_ARCNET:
		ipv6_arcnet_mc_map(addr, buf);
		return 0;
	case ARPHRD_INFINIBAND:
		ipv6_ib_mc_map(addr, dev->broadcast, buf);
		return 0;
	case ARPHRD_IPGRE:
		return ipv6_ipgre_mc_map(addr, dev->broadcast, buf);
	default:
		if (dir) {
			memcpy(buf, dev->broadcast, dev->addr_len);
			return 0;
		}
	}
	return -EINVAL;
}

Project: linux
File: ndisc.c

static void __net_exit ndisc_net_exit(struct net *net)
{
	inet_ctl_sock_destroy(net->ipv6.ndisc_sk);
}

Project: linux
File: ndisc.c

static int __net_init ndisc_net_init(struct net *net)
{
	struct ipv6_pinfo *np;
	struct sock *sk;
	int err;

	err = inet_ctl_sock_create(&sk, PF_INET6,
				   SOCK_RAW, IPPROTO_ICMPV6, net);
	if (err < 0) {
		ND_PRINTK(0, err,
			  "NDISC: Failed to initialize the control socket (err %d)\n",
			  err);
		return err;
	}

	net->ipv6.ndisc_sk = sk;

	np = inet6_sk(sk);
	np->hop_limit = 255;
	/* Do not loopback ndisc messages */
	np->mc_loop = 0;

	return 0;
}

Project: linux
File: ndisc.c

static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	struct net *net = dev_net(dev);
	struct inet6_dev *idev;

	switch (event) {
	case NETDEV_CHANGEADDR:
		neigh_changeaddr(&nd_tbl, dev);
		fib6_run_gc(0, net, false);
		idev = in6_dev_get(dev);
		if (!idev)
			break;
		if (idev->cnf.ndisc_notify)
			ndisc_send_unsol_na(dev);
		in6_dev_put(idev);
		break;
	case NETDEV_DOWN:
		neigh_ifdown(&nd_tbl, dev);
		fib6_run_gc(0, net, false);
		break;
	case NETDEV_NOTIFY_PEERS:
		ndisc_send_unsol_na(dev);
		break;
	default:
		break;
	}

	return NOTIFY_DONE;
}

Project: linux
File: ndisc.c

static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
					    struct nd_opt_hdr *end)
{
	int type;
	if (!cur || !end || cur >= end)
		return NULL;
	type = cur->nd_opt_type;
	do {
		cur = ((void *)cur) + (cur->nd_opt_len << 3);
	} while (cur < end && cur->nd_opt_type != type);
	return cur <= end && cur->nd_opt_type == type ? cur : NULL;
}

Project: linux
File: ndisc.c

static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur,
					     struct nd_opt_hdr *end)
{
	if (!cur || !end || cur >= end)
		return NULL;
	do {
		cur = ((void *)cur) + (cur->nd_opt_len << 3);
	} while (cur < end && !ndisc_is_useropt(cur));
	return cur <= end && ndisc_is_useropt(cur) ? cur : NULL;
}

Project: linux
File: ndisc.c

struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
					  struct 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:
		case ND_OPT_MTU:
		case ND_OPT_REDIRECT_HDR:
			if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
				ND_PRINTK(2, warn,
					  "%s: duplicated 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;
		case ND_OPT_PREFIX_INFO:
			ndopts->nd_opts_pi_end = nd_opt;
			if (!ndopts->nd_opt_array[nd_opt->nd_opt_type])
				ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
			break;
#ifdef CONFIG_IPV6_ROUTE_INFO
		case ND_OPT_ROUTE_INFO:
			ndopts->nd_opts_ri_end = nd_opt;
			if (!ndopts->nd_opts_ri)
				ndopts->nd_opts_ri = nd_opt;
			break;
#endif
		default:
			if (ndisc_is_useropt(nd_opt)) {
				ndopts->nd_useropts_end = nd_opt;
				if (!ndopts->nd_useropts)
					ndopts->nd_useropts = nd_opt;
			} else {
				/*
				 * 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;
}

Project: linux
File: ndisc.c

static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
{
	struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
	struct sk_buff *skb;
	struct nlmsghdr *nlh;
	struct nduseroptmsg *ndmsg;
	struct net *net = dev_net(ra->dev);
	int err;
	int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
				    + (opt->nd_opt_len << 3));
	size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr));

	skb = nlmsg_new(msg_size, GFP_ATOMIC);
	if (skb == NULL) {
		err = -ENOBUFS;
		goto errout;
	}

	nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);
	if (nlh == NULL) {
		goto nla_put_failure;
	}

	ndmsg = nlmsg_data(nlh);
	ndmsg->nduseropt_family = AF_INET6;
	ndmsg->nduseropt_ifindex = ra->dev->ifindex;
	ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
	ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
	ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;

	memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3);

	if (nla_put(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr),
		    &ipv6_hdr(ra)->saddr))
		goto nla_put_failure;
	nlmsg_end(skb, nlh);

	rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC);
	return;

nla_put_failure:
	nlmsg_free(skb);
	err = -EMSGSIZE;
errout:
	rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
}

Project: linux
File: ndisc.c

int ndisc_rcv(struct sk_buff *skb)
{
	struct nd_msg *msg;

	if (ndisc_suppress_frag_ndisc(skb))
		return 0;

	if (skb_linearize(skb))
		return 0;

	msg = (struct nd_msg *)skb_transport_header(skb);

	__skb_push(skb, skb->data - skb_transport_header(skb));

	if (ipv6_hdr(skb)->hop_limit != 255) {
		ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n",
			  ipv6_hdr(skb)->hop_limit);
		return 0;
	}

	if (msg->icmph.icmp6_code != 0) {
		ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n",
			  msg->icmph.icmp6_code);
		return 0;
	}

	memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));

	switch (msg->icmph.icmp6_type) {
	case NDISC_NEIGHBOUR_SOLICITATION:
		ndisc_recv_ns(skb);
		break;

	case NDISC_NEIGHBOUR_ADVERTISEMENT:
		ndisc_recv_na(skb);
		break;

	case NDISC_ROUTER_SOLICITATION:
		ndisc_recv_rs(skb);
		break;

	case NDISC_ROUTER_ADVERTISEMENT:
		ndisc_router_discovery(skb);
		break;

	case NDISC_REDIRECT:
		ndisc_redirect_rcv(skb);
		break;
	}

	return 0;
}

Project: linux
File: ndisc.c

static void 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 ndisc_options ndopts;
	struct net_device *dev = skb->dev;
	struct inet6_ifaddr *ifp;
	struct neighbour *neigh;

	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;
	}

	if (!ndisc_parse_options(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);
		if (!lladdr) {
			ND_PRINTK(2, warn,
				  "NA: invalid link-layer address length\n");
			return;
		}
	}
	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 ((old_flags & ~neigh->flags) & NTF_ROUTER) {
			/*
			 * Change: router to host
			 */
			rt6_clean_tohost(dev_net(dev),  saddr);
		}

out:
		neigh_release(neigh);
	}
}

Project: linux
File: ndisc.c

static void 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 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;

	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 (!ndisc_parse_options(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);
		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;
		}
	}

	inc = ipv6_addr_is_multicast(daddr);

	ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
	if (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);

		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, NULL, &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 (neigh || !dev->header_ops) {
		ndisc_send_na(dev, neigh, 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);
}

Project: linux
File: ndisc.c

static void ndisc_recv_rs(struct sk_buff *skb)
{
	struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb);
	unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
	struct neighbour *neigh;
	struct inet6_dev *idev;
	const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
	struct ndisc_options ndopts;
	u8 *lladdr = NULL;

	if (skb->len < sizeof(*rs_msg))
		return;

	idev = __in6_dev_get(skb->dev);
	if (!idev) {
		ND_PRINTK(1, err, "RS: can't find in6 device\n");
		return;
	}

	/* Don't accept RS if we're not in router mode */
	if (!idev->cnf.forwarding)
		goto out;

	/*
	 * Don't update NCE if src = ::;
	 * this implies that the source node has no ip address assigned yet.
	 */
	if (ipv6_addr_any(saddr))
		goto out;

	/* Parse ND options */
	if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) {
		ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n");
		goto out;
	}

	if (ndopts.nd_opts_src_lladdr) {
		lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
					     skb->dev);
		if (!lladdr)
			goto out;
	}

	neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
	if (neigh) {
		neigh_update(neigh, lladdr, NUD_STALE,
			     NEIGH_UPDATE_F_WEAK_OVERRIDE|
			     NEIGH_UPDATE_F_OVERRIDE|
			     NEIGH_UPDATE_F_OVERRIDE_ISROUTER);
		neigh_release(neigh);
	}
out:
	return;
}

Project: linux
File: ndisc.c

static void ndisc_redirect_rcv(struct sk_buff *skb)
{
	u8 *hdr;
	struct ndisc_options ndopts;
	struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb);
	u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
				    offsetof(struct rd_msg, opt));

#ifdef CONFIG_IPV6_NDISC_NODETYPE
	switch (skb->ndisc_nodetype) {
	case NDISC_NODETYPE_HOST:
	case NDISC_NODETYPE_NODEFAULT:
		ND_PRINTK(2, warn,
			  "Redirect: from host or unauthorized router\n");
		return;
	}
#endif

	if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
		ND_PRINTK(2, warn,
			  "Redirect: source address is not link-local\n");
		return;
	}

	if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts))
		return;

	if (!ndopts.nd_opts_rh) {
		ip6_redirect_no_header(skb, dev_net(skb->dev),
					skb->dev->ifindex, 0);
		return;
	}

	hdr = (u8 *)ndopts.nd_opts_rh;
	hdr += 8;
	if (!pskb_pull(skb, hdr - skb_transport_header(skb)))
		return;

	icmpv6_notify(skb, NDISC_REDIRECT, 0, 0);
}

Project: linux
File: ndisc.c

void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
		   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);

	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);


	ndisc_send_skb(skb, daddr, src_addr);
}

Project: linux
File: ndisc.c

void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
		   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 == NULL) {
		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);

	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);

	ndisc_send_skb(skb, daddr, saddr);
}

Project: linux
File: ndisc.c

void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
{
	struct net_device *dev = skb->dev;
	struct net *net = dev_net(dev);
	struct sock *sk = net->ipv6.ndisc_sk;
	int optlen = 0;
	struct inet_peer *peer;
	struct sk_buff *buff;
	struct rd_msg *msg;
	struct in6_addr saddr_buf;
	struct rt6_info *rt;
	struct dst_entry *dst;
	struct flowi6 fl6;
	int rd_len;
	u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;
	bool ret;

	if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
		ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n",
			  dev->name);
		return;
	}

	if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) &&
	    ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
		ND_PRINTK(2, warn,
			  "Redirect: target address is not link-local unicast\n");
		return;
	}

	icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT,
			 &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex);

	dst = ip6_route_output(net, NULL, &fl6);
	if (dst->error) {
		dst_release(dst);
		return;
	}
	dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
	if (IS_ERR(dst))
		return;

	rt = (struct rt6_info *) dst;

	if (rt->rt6i_flags & RTF_GATEWAY) {
		ND_PRINTK(2, warn,
			  "Redirect: destination is not a neighbour\n");
		goto release;
	}
	peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
	ret = inet_peer_xrlim_allow(peer, 1*HZ);
	if (peer)
		inet_putpeer(peer);
	if (!ret)
		goto release;

	if (dev->addr_len) {
		struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target);
		if (!neigh) {
			ND_PRINTK(2, warn,
				  "Redirect: no neigh for target address\n");
			goto release;
		}

		read_lock_bh(&neigh->lock);
		if (neigh->nud_state & NUD_VALID) {
			memcpy(ha_buf, neigh->ha, dev->addr_len);
			read_unlock_bh(&neigh->lock);
			ha = ha_buf;
			optlen += ndisc_opt_addr_space(dev);
		} else
			read_unlock_bh(&neigh->lock);

		neigh_release(neigh);
	}

	rd_len = min_t(unsigned int,
		       IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen,
		       skb->len + 8);
	rd_len &= ~0x7;
	optlen += rd_len;

	buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
	if (!buff)
		goto release;

	msg = (struct rd_msg *)skb_put(buff, sizeof(*msg));
	*msg = (struct rd_msg) {
		.icmph = {
			.icmp6_type = NDISC_REDIRECT,
		},
		.target = *target,
		.dest = ipv6_hdr(skb)->daddr,
	};

	/*
	 *	include target_address option
	 */

	if (ha)
		ndisc_fill_addr_option(buff, ND_OPT_TARGET_LL_ADDR, ha);

	/*
	 *	build redirect option and copy skb over to the new packet.
	 */

	if (rd_len)
		ndisc_fill_redirect_hdr_option(buff, skb, rd_len);

	skb_dst_set(buff, dst);
	ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf);
	return;

release:
	dst_release(dst);
}

Project: linux
File: ndisc.c

void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
		   const struct in6_addr *daddr)
{
	struct sk_buff *skb;
	struct rs_msg *msg;
	int send_sllao = dev->addr_len;
	int optlen = 0;

#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
	/*
	 * According to section 2.2 of RFC 4429, we must not
	 * send router solicitations with a sllao from
	 * optimistic addresses, but we may send the solicitation
	 * if we don't include the sllao.  So here we check
	 * if our address is optimistic, and if so, we
	 * suppress the inclusion of the sllao.
	 */
	if (send_sllao) {
		struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr,
							   dev, 1);
		if (ifp) {
			if (ifp->flags & IFA_F_OPTIMISTIC)  {
				send_sllao = 0;
			}
			in6_ifa_put(ifp);
		} else {
			send_sllao = 0;
		}
	}
#endif
	if (send_sllao)
		optlen += ndisc_opt_addr_space(dev);

	skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
	if (!skb)
		return;

	msg = (struct rs_msg *)skb_put(skb, sizeof(*msg));
	*msg = (struct rs_msg) {
		.icmph = {
			.icmp6_type = NDISC_ROUTER_SOLICITATION,
		},
	};

	if (send_sllao)
		ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR,
				       dev->dev_addr);

	ndisc_send_skb(skb, daddr, saddr);
}

Project: linux
File: ndisc.c

static void ndisc_send_skb(struct sk_buff *skb,
			   const struct in6_addr *daddr,
			   const struct in6_addr *saddr)
{
	struct dst_entry *dst = skb_dst(skb);
	struct net *net = dev_net(skb->dev);
	struct sock *sk = net->ipv6.ndisc_sk;
	struct inet6_dev *idev;
	int err;
	struct icmp6hdr *icmp6h = icmp6_hdr(skb);
	u8 type;

	type = icmp6h->icmp6_type;

	if (!dst) {
		struct flowi6 fl6;

		icmpv6_flow_init(sk, &fl6, type, saddr, daddr, skb->dev->ifindex);
		dst = icmp6_dst_alloc(skb->dev, &fl6);
		if (IS_ERR(dst)) {
			kfree_skb(skb);
			return;
		}

		skb_dst_set(skb, dst);
	}

	icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len,
					      IPPROTO_ICMPV6,
					      csum_partial(icmp6h,
							   skb->len, 0));

	ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len);

	rcu_read_lock();
	idev = __in6_dev_get(dst->dev);
	IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);

	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev,
		      dst_output);
	if (!err) {
		ICMP6MSGOUT_INC_STATS(net, idev, type);
		ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
	}

	rcu_read_unlock();
}

Project: linux
File: ndisc.c

static void ndisc_send_unsol_na(struct net_device *dev)
{
	struct inet6_dev *idev;
	struct inet6_ifaddr *ifa;

	idev = in6_dev_get(dev);
	if (!idev)
		return;

	read_lock_bh(&idev->lock);
	list_for_each_entry(ifa, &idev->addr_list, if_list) {
		ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &ifa->addr,
			      /*router=*/ !!idev->cnf.forwarding,
			      /*solicited=*/ false, /*override=*/ true,
			      /*inc_opt=*/ true);
	}
	read_unlock_bh(&idev->lock);

	in6_dev_put(idev);
}

Project: linux
File: ndisc.c

static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
{
	struct in6_addr *saddr = NULL;
	struct in6_addr mcaddr;
	struct net_device *dev = neigh->dev;
	struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
	int probes = atomic_read(&neigh->probes);

	if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr,
					   dev, 1,
					   IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))
		saddr = &ipv6_hdr(skb)->saddr;
	probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES);
	if (probes < 0) {
		if (!(neigh->nud_state & NUD_VALID)) {
			ND_PRINTK(1, dbg,
				  "%s: trying to ucast probe in NUD_INVALID: %pI6\n",
				  __func__, target);
		}
		ndisc_send_ns(dev, neigh, target, target, saddr);
	} else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) {
		neigh_app_ns(neigh);
	} else {
		addrconf_addr_solict_mult(target, &mcaddr);
		ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
	}
}

Project: linux
File: ndisc.c

static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb)
{
	struct inet6_dev *idev = __in6_dev_get(skb->dev);

	if (!idev)
		return true;
	if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED &&
	    idev->cnf.suppress_frag_ndisc) {
		net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n");
		return true;
	}
	return false;
}

Project: linux
File: ndisc.c

static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl,
					 const char *func, const char *dev_name)
{
	static char warncomm[TASK_COMM_LEN];
	static int warned;
	if (strcmp(warncomm, current->comm) && warned < 5) {
		strcpy(warncomm, current->comm);
		pr_warn("process `%s' is using deprecated sysctl (%s) net.ipv6.neigh.%s.%s - use net.ipv6.neigh.%s.%s_ms instead\n",
			warncomm, func,
			dev_name, ctl->procname,
			dev_name, ctl->procname);
		warned++;
	}
}

Project: linux
File: ndisc.c

static int pndisc_constructor(struct pneigh_entry *n)
{
	struct in6_addr *addr = (struct in6_addr *)&n->key;
	struct in6_addr maddr;
	struct net_device *dev = n->dev;

	if (dev == NULL || __in6_dev_get(dev) == NULL)
		return -EINVAL;
	addrconf_addr_solict_mult(addr, &maddr);
	ipv6_dev_mc_inc(dev, &maddr);
	return 0;
}

Project: linux
File: ndisc.c

static void pndisc_destructor(struct pneigh_entry *n)
{
	struct in6_addr *addr = (struct in6_addr *)&n->key;
	struct in6_addr maddr;
	struct net_device *dev = n->dev;

	if (dev == NULL || __in6_dev_get(dev) == NULL)
		return;
	addrconf_addr_solict_mult(addr, &maddr);
	ipv6_dev_mc_dec(dev, &maddr);
}

Project: linux
File: ndisc.c

static int pndisc_is_router(const void *pkey,
			    struct net_device *dev)
{
	struct pneigh_entry *n;
	int ret = -1;

	read_lock_bh(&nd_tbl.lock);
	n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev);
	if (n)
		ret = !!(n->flags & NTF_ROUTER);
	read_unlock_bh(&nd_tbl.lock);

	return ret;
}

Project: linux
File: ndisc.c

static void pndisc_redo(struct sk_buff *skb)
{
	ndisc_recv_ns(skb);
	kfree_skb(skb);
}