cregit-Linux how code gets into the kernel

Release 4.11 net/ipv6/ndisc.c

Directory: net/ipv6
/*
 *      Neighbour Discovery for IPv6
 *      Linux INET6 implementation
 *
 *      Authors:
 *      Pedro Roque             <roque@di.fc.ul.pt>
 *      Mike Shaver             <shaver@ingenia.com>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

/*
 *      Changes:
 *
 *      Alexey I. Froloff               :       RFC6106 (DNSSL) support
 *      Pierre Ynard                    :       export userland ND options
 *                                              through netlink (RDNSS support)
 *      Lars Fenneberg                  :       fixed MTU setting on receipt
 *                                              of an RA.
 *      Janos Farkas                    :       kmalloc failure checks
 *      Alexey Kuznetsov                :       state machine reworked
 *                                              and moved to net/core.
 *      Pekka Savola                    :       RFC2461 validation
 *      YOSHIFUJI Hideaki @USAGI        :       Verify ND options properly
 */


#define pr_fmt(fmt) "ICMPv6: " fmt

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/sched.h>
#include <linux/net.h>
#include <linux/in6.h>
#include <linux/route.h>
#include <linux/init.h>
#include <linux/rcupdate.h>
#include <linux/slab.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif

#include <linux/if_addr.h>
#include <linux/if_arp.h>
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/jhash.h>

#include <net/sock.h>
#include <net/snmp.h>

#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/ndisc.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/icmp.h>

#include <net/netlink.h>
#include <linux/rtnetlink.h>

#include <net/flow.h>
#include <net/ip6_checksum.h>
#include <net/inet_common.h>
#include <linux/proc_fs.h>

#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>

static u32 ndisc_hash(const void *pkey,
		      const struct net_device *dev,
		      __u32 *hash_rnd);
static bool ndisc_key_eq(const struct neighbour *neigh, const void *pkey);
static int ndisc_constructor(struct neighbour *neigh);
static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
static int pndisc_constructor(struct pneigh_entry *n);
static void pndisc_destructor(struct pneigh_entry *n);
static void pndisc_redo(struct sk_buff *skb);


static const struct neigh_ops ndisc_generic_ops = {
	.family =		AF_INET6,
	.solicit =		ndisc_solicit,
	.error_report =		ndisc_error_report,
	.output =		neigh_resolve_output,
	.connected_output =	neigh_connected_output,
};


static const struct neigh_ops ndisc_hh_ops = {
	.family =		AF_INET6,
	.solicit =		ndisc_solicit,
	.error_report =		ndisc_error_report,
	.output =		neigh_resolve_output,
	.connected_output =	neigh_resolve_output,
};



static const struct neigh_ops ndisc_direct_ops = {
	.family =		AF_INET6,
	.output =		neigh_direct_output,
	.connected_output =	neigh_direct_output,
};


struct neigh_table nd_tbl = {
	.family =	AF_INET6,
	.key_len =	sizeof(struct in6_addr),
	.protocol =	cpu_to_be16(ETH_P_IPV6),
	.hash =		ndisc_hash,
	.key_eq =	ndisc_key_eq,
	.constructor =	ndisc_constructor,
	.pconstructor =	pndisc_constructor,
	.pdestructor =	pndisc_destructor,
	.proxy_redo =	pndisc_redo,
	.id =		"ndisc_cache",
	.parms = {
		.tbl			= &nd_tbl,
		.reachable_time		= ND_REACHABLE_TIME,
		.data = {
			[NEIGH_VAR_MCAST_PROBES] = 3,
			[NEIGH_VAR_UCAST_PROBES] = 3,
			[NEIGH_VAR_RETRANS_TIME] = ND_RETRANS_TIMER,
			[NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME,
			[NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ,
			[NEIGH_VAR_GC_STALETIME] = 60 * HZ,
			[NEIGH_VAR_QUEUE_LEN_BYTES] = 64 * 1024,
			[NEIGH_VAR_PROXY_QLEN] = 64,
			[NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ,
			[NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10,
                },
        },
	.gc_interval =	  30 * HZ,
	.gc_thresh1 =	 128,
	.gc_thresh2 =	 512,
	.gc_thresh3 =	1024,
};

EXPORT_SYMBOL_GPL(nd_tbl);




void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data,
			      int data_len, int pad)
{
	int space = __ndisc_opt_addr_space(data_len, pad);
	u8 *opt = skb_put(skb, space);

	opt[0] = type;
	opt[1] = space>>3;

	memset(opt + 2, 0, pad);
	opt   += pad;
	space -= pad;

	memcpy(opt+2, data, data_len);
	data_len += 2;
	opt += data_len;
	space -= data_len;
	if (space > 0)
		memset(opt, 0, space);
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)6051.28%333.33%


Roland Dreier2420.51%111.11%


Hideaki Yoshifuji / 吉藤英明1815.38%333.33%


Alexander Aring119.40%111.11%


Ian Morris43.42%111.11%


Total117100.00%9100.00%




EXPORT_SYMBOL_GPL(__ndisc_fill_addr_option);




static inline void ndisc_fill_addr_option(struct sk_buff *skb, int type,
					  void *data, u8 icmp6_type)
{
	__ndisc_fill_addr_option(skb, type, data, skb->dev->addr_len,
				 ndisc_addr_option_pad(skb->dev->type));
	ndisc_ops_fill_addr_option(skb->dev, skb, icmp6_type);
}


Contributors
PersonTokensPropCommitsCommitProp
Alexander Aring57100.00%2100.00%


Total57100.00%2100.00%






static inline void ndisc_fill_redirect_addr_option(struct sk_buff *skb,
						   void *ha,
						   const u8 *ops_data)
{
	ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, ha, NDISC_REDIRECT);
	ndisc_ops_fill_redirect_addr_option(skb->dev, skb, ops_data);
}


Contributors
PersonTokensPropCommitsCommitProp
Alexander Aring43100.00%2100.00%


Total43100.00%2100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明91100.00%2100.00%


Total91100.00%2100.00%






static inline int ndisc_is_useropt(const struct net_device *dev,
				   struct nd_opt_hdr *opt)
{
	return opt->nd_opt_type == ND_OPT_RDNSS ||
		opt->nd_opt_type == ND_OPT_DNSSL ||
		ndisc_ops_is_useropt(dev, opt->nd_opt_type);
}


Contributors
PersonTokensPropCommitsCommitProp
Pierre Ynard1947.50%133.33%


Alexander Aring1537.50%133.33%


Alexey I. Froloff615.00%133.33%


Total40100.00%3100.00%






static struct nd_opt_hdr *ndisc_next_useropt(const struct net_device *dev,
					     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(dev, cur));
	return cur <= end && ndisc_is_useropt(dev, cur) ? cur : NULL;
}


Contributors
PersonTokensPropCommitsCommitProp
Pierre Ynard8189.01%150.00%


Alexander Aring1010.99%150.00%


Total91100.00%2100.00%






struct ndisc_options *ndisc_parse_options(const struct net_device *dev,
					  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;
		if (ndisc_ops_parse_options(dev, nd_opt, ndopts))
			goto next_opt;
		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_NONCE:
		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(dev, 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);
			}
		}
next_opt:
		opt_len -= l;
		nd_opt = ((void *)nd_opt) + l;
	}
	return ndopts;
}


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明24976.85%327.27%


Pierre Ynard329.88%19.09%


Alexander Aring247.41%19.09%


Joe Perches123.70%218.18%


Erik Nordmark30.93%19.09%


Stephen Hemminger20.62%218.18%


Harvey Harrison20.62%19.09%


Total324100.00%11100.00%






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;
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7863.41%550.00%


Timo Teräs1512.20%110.00%


Roland Dreier1310.57%110.00%


Hideaki Yoshifuji / 吉藤英明129.76%110.00%


Rolf Manderscheid43.25%110.00%


Eric Dumazet10.81%110.00%


Total123100.00%10100.00%




EXPORT_SYMBOL(ndisc_mc_map);




static u32 ndisc_hash(const void *pkey,
		      const struct net_device *dev,
		      __u32 *hash_rnd)
{
	return ndisc_hashfn(pkey, dev, hash_rnd);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1961.29%125.00%


David S. Miller929.03%250.00%


Eric Dumazet39.68%125.00%


Total31100.00%4100.00%






static bool ndisc_key_eq(const struct neighbour *n, const void *pkey)
{
	return neigh_key_eq128(n, pkey);
}


Contributors
PersonTokensPropCommitsCommitProp
Eric W. Biedermann25100.00%1100.00%


Total25100.00%1100.00%






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) {
		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;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)25484.39%753.85%


Herbert Xu299.63%17.69%


Hideaki Yoshifuji / 吉藤英明103.32%17.69%


Stephen Hemminger51.66%17.69%


David S. Miller10.33%17.69%


Eric Dumazet10.33%17.69%


Ian Morris10.33%17.69%


Total301100.00%13100.00%






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


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7095.89%675.00%


Ian Morris22.74%112.50%


Linus Torvalds11.37%112.50%


Total73100.00%8100.00%






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 || !__in6_dev_get(dev))
		return;
	addrconf_addr_solict_mult(addr, &maddr);
	ipv6_dev_mc_dec(dev, &maddr);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)6495.52%675.00%


Ian Morris22.99%112.50%


Linus Torvalds11.49%112.50%


Total67100.00%8100.00%






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;
}


Contributors
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Hideaki Yoshifuji / 吉藤英明12391.79%480.00%


Thomas Graf118.21%120.00%


Total134100.00%5100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明101100.00%3100.00%


Total101100.00%3100.00%






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;
		int oif = skb->dev->ifindex;

		icmpv6_flow_init(sk, &fl6, type, saddr, daddr, oif);
		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,
		      net, sk, 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();
}


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明9333.57%722.58%


Brian Haley8430.32%13.23%


jlut@cs.hut.fi196.86%13.23%


Randy Dunlap134.69%13.23%


David Ahern124.33%26.45%


Linus Torvalds (pre-git)124.33%39.68%


Eric Dumazet103.61%26.45%


David S. Miller93.25%39.68%


Neil Horman62.17%13.23%


Denis V. Lunev62.17%39.68%


Eric W. Biedermann31.08%26.45%


Shirley Ma31.08%13.23%


Kazunori Miyazawa31.08%13.23%


David L Stevens20.72%13.23%


Jan Engelhardt10.36%13.23%


Patrick McHardy10.36%13.23%


Total277100.00%31100.00%






void 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,
					       NDISC_NEIGHBOUR_ADVERTISEMENT);

	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_NEIGHBOUR_ADVERTISEMENT);

	ndisc_send_skb(skb, daddr, src_addr);
}


Contributors
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Hideaki Yoshifuji / 吉藤英明23782.58%738.89%


Linus Torvalds (pre-git)206.97%316.67%


Stephen Hemminger103.48%15.56%


Kazunori Miyazawa51.74%15.56%


Brian Haley51.74%15.56%


Alexander Aring41.39%15.56%


Randy Dunlap31.05%15.56%


Daniel Lezcano20.70%211.11%


Daniel Baluta10.35%15.56%


Total287100.00%18100.00%






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, &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);
}


Contributors
PersonTokensPropCommitsCommitProp
Ben Hutchings9598.96%150.00%


Hideaki Yoshifuji / 吉藤英明11.04%150.00%


Total96100.00%2100.00%






void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
		   const struct in6_addr *daddr, const struct in6_addr *saddr,
		   u64 nonce)
{
	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,
					       NDISC_NEIGHBOUR_SOLICITATION);
	if (nonce != 0)
		optlen += 8;

	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,
                },