cregit-Linux how code gets into the kernel

Release 4.11 net/mpls/af_mpls.c

Directory: net/mpls
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/sysctl.h>
#include <linux/net.h>
#include <linux/module.h>
#include <linux/if_arp.h>
#include <linux/ipv6.h>
#include <linux/mpls.h>
#include <linux/netconf.h>
#include <linux/vmalloc.h>
#include <linux/percpu.h>
#include <net/ip.h>
#include <net/dst.h>
#include <net/sock.h>
#include <net/arp.h>
#include <net/ip_fib.h>
#include <net/netevent.h>
#include <net/netns/generic.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
#endif
#include <net/addrconf.h>
#include <net/nexthop.h>
#include "internal.h"

/* Maximum number of labels to look ahead at when selecting a path of
 * a multipath route
 */

#define MAX_MP_SELECT_LABELS 4


#define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1)


static int zero = 0;

static int label_limit = (1 << 20) - 1;

static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
		       struct nlmsghdr *nlh, struct net *net, u32 portid,
		       unsigned int nlm_flags);




static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index)
{
	struct mpls_route *rt = NULL;

	if (index < net->mpls.platform_labels) {
		struct mpls_route __rcu **platform_label =
			rcu_dereference(net->mpls.platform_label);
		rt = rcu_dereference(platform_label[index]);
	}
	return rt;
}


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bool mpls_output_possible(const struct net_device *dev)
{
	return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev);
}

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EXPORT_SYMBOL_GPL(mpls_output_possible);




static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh)
{
	u8 *nh0_via = PTR_ALIGN((u8 *)&rt->rt_nh[rt->rt_nhn], VIA_ALEN_ALIGN);
	int nh_index = nh - rt->rt_nh;

	return nh0_via + rt->rt_max_alen * nh_index;
}


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static const u8 *mpls_nh_via(const struct mpls_route *rt,
			     const struct mpls_nh *nh)
{
	return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh);
}


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static unsigned int mpls_nh_header_size(const struct mpls_nh *nh)
{
	/* The size of the layer 2.5 labels to be added for this route */
	return nh->nh_labels * sizeof(struct mpls_shim_hdr);
}


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unsigned int mpls_dev_mtu(const struct net_device *dev)
{
	/* The amount of data the layer 2 frame can hold */
	return dev->mtu;
}

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EXPORT_SYMBOL_GPL(mpls_dev_mtu);




bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
{
	if (skb->len <= mtu)
		return false;

	if (skb_is_gso(skb) && skb_gso_validate_mtu(skb, mtu))
		return false;

	return true;
}

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EXPORT_SYMBOL_GPL(mpls_pkt_too_big);




void mpls_stats_inc_outucastpkts(struct net_device *dev,
				 const struct sk_buff *skb)
{
	struct mpls_dev *mdev;

	if (skb->protocol == htons(ETH_P_MPLS_UC)) {
		mdev = mpls_dev_get(dev);
		if (mdev)
			MPLS_INC_STATS_LEN(mdev, skb->len,
					   tx_packets,
					   tx_bytes);
	} else if (skb->protocol == htons(ETH_P_IP)) {
		IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len);
#if IS_ENABLED(CONFIG_IPV6)
	} else if (skb->protocol == htons(ETH_P_IPV6)) {
		struct inet6_dev *in6dev = __in6_dev_get(dev);

		if (in6dev)
			IP6_UPD_PO_STATS(dev_net(dev), in6dev,
					 IPSTATS_MIB_OUT, skb->len);
#endif
	}
}

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EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts);




static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb)
{
	struct mpls_entry_decoded dec;
	unsigned int mpls_hdr_len = 0;
	struct mpls_shim_hdr *hdr;
	bool eli_seen = false;
	int label_index;
	u32 hash = 0;

	for (label_index = 0; label_index < MAX_MP_SELECT_LABELS;
	     label_index++) {
		mpls_hdr_len += sizeof(*hdr);
		if (!pskb_may_pull(skb, mpls_hdr_len))
			break;

		/* Read and decode the current label */
		hdr = mpls_hdr(skb) + label_index;
		dec = mpls_entry_decode(hdr);

		/* RFC6790 - reserved labels MUST NOT be used as keys
                 * for the load-balancing function
                 */
		if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) {
			hash = jhash_1word(dec.label, hash);

			/* The entropy label follows the entropy label
                         * indicator, so this means that the entropy
                         * label was just added to the hash - no need to
                         * go any deeper either in the label stack or in the
                         * payload
                         */
			if (eli_seen)
				break;
		} else if (dec.label == MPLS_LABEL_ENTROPY) {
			eli_seen = true;
		}

		if (!dec.bos)
			continue;

		/* found bottom label; does skb have room for a header? */
		if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) {
			const struct iphdr *v4hdr;

			v4hdr = (const struct iphdr *)(hdr + 1);
			if (v4hdr->version == 4) {
				hash = jhash_3words(ntohl(v4hdr->saddr),
						    ntohl(v4hdr->daddr),
						    v4hdr->protocol, hash);
			} else if (v4hdr->version == 6 &&
				   pskb_may_pull(skb, mpls_hdr_len +
						 sizeof(struct ipv6hdr))) {
				const struct ipv6hdr *v6hdr;

				v6hdr = (const struct ipv6hdr *)(hdr + 1);
				hash = __ipv6_addr_jhash(&v6hdr->saddr, hash);
				hash = __ipv6_addr_jhash(&v6hdr->daddr, hash);
				hash = jhash_1word(v6hdr->nexthdr, hash);
			}
		}

		break;
	}

	return hash;
}


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static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt,
					     struct sk_buff *skb)
{
	int alive = ACCESS_ONCE(rt->rt_nhn_alive);
	u32 hash = 0;
	int nh_index = 0;
	int n = 0;

	/* No need to look further into packet if there's only
         * one path
         */
	if (rt->rt_nhn == 1)
		goto out;

	if (alive <= 0)
		return NULL;

	hash = mpls_multipath_hash(rt, skb);
	nh_index = hash % alive;
	if (alive == rt->rt_nhn)
		goto out;
	for_nexthops(rt) {
		if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
			continue;
		if (n == nh_index)
			return nh;
		n++;
	} endfor_nexthops(rt);

out:
	return &rt->rt_nh[nh_index];
}


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static bool mpls_egress(struct mpls_route *rt, struct sk_buff *skb,
			struct mpls_entry_decoded dec)
{
	enum mpls_payload_type payload_type;
	bool success = false;

	/* The IPv4 code below accesses through the IPv4 header
         * checksum, which is 12 bytes into the packet.
         * The IPv6 code below accesses through the IPv6 hop limit
         * which is 8 bytes into the packet.
         *
         * For all supported cases there should always be at least 12
         * bytes of packet data present.  The IPv4 header is 20 bytes
         * without options and the IPv6 header is always 40 bytes
         * long.
         */
	if (!pskb_may_pull(skb, 12))
		return false;

	payload_type = rt->rt_payload_type;
	if (payload_type == MPT_UNSPEC)
		payload_type = ip_hdr(skb)->version;

	switch (payload_type) {
	case MPT_IPV4: {
		struct iphdr *hdr4 = ip_hdr(skb);
		skb->protocol = htons(ETH_P_IP);
		csum_replace2(&hdr4->check,
			      htons(hdr4->ttl << 8),
			      htons(dec.ttl << 8));
		hdr4->ttl = dec.ttl;
		success = true;
		break;
	}
	case MPT_IPV6: {
		struct ipv6hdr *hdr6 = ipv6_hdr(skb);
		skb->protocol = htons(ETH_P_IPV6);
		hdr6->hop_limit = dec.ttl;
		success = true;
		break;
	}
	case MPT_UNSPEC:
		break;
	}

	return success;
}


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static int mpls_forward(struct sk_buff *skb, struct net_device *dev,
			struct packet_type *pt, struct net_device *orig_dev)
{
	struct net *net = dev_net(dev);
	struct mpls_shim_hdr *hdr;
	struct mpls_route *rt;
	struct mpls_nh *nh;
	struct mpls_entry_decoded dec;
	struct net_device *out_dev;
	struct mpls_dev *out_mdev;
	struct mpls_dev *mdev;
	unsigned int hh_len;
	unsigned int new_header_size;
	unsigned int mtu;
	int err;

	/* Careful this entire function runs inside of an rcu critical section */

	mdev = mpls_dev_get(dev);
	if (!mdev)
		goto drop;

	MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets,
			   rx_bytes);

	if (!mdev->input_enabled) {
		MPLS_INC_STATS(mdev, rx_dropped);
		goto drop;
	}

	if (skb->pkt_type != PACKET_HOST)
		goto err;

	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
		goto err;

	if (!pskb_may_pull(skb, sizeof(*hdr)))
		goto err;

	/* Read and decode the label */
	hdr = mpls_hdr(skb);
	dec = mpls_entry_decode(hdr);

	rt = mpls_route_input_rcu(net, dec.label);
	if (!rt) {
		MPLS_INC_STATS(mdev, rx_noroute);
		goto drop;
	}

	nh = mpls_select_multipath(rt, skb);
	if (!nh)
		goto err;

	/* Pop the label */
	skb_pull(skb, sizeof(*hdr));
	skb_reset_network_header(skb);

	skb_orphan(skb);

	if (skb_warn_if_lro(skb))
		goto err;

	skb_forward_csum(skb);

	/* Verify ttl is valid */
	if (dec.ttl <= 1)
		goto err;
	dec.ttl -= 1;

	/* Find the output device */
	out_dev = rcu_dereference(nh->nh_dev);
	if (!mpls_output_possible(out_dev))
		goto tx_err;

	/* Verify the destination can hold the packet */
	new_header_size = mpls_nh_header_size(nh);
	mtu = mpls_dev_mtu(out_dev);
	if (mpls_pkt_too_big(skb, mtu - new_header_size))
		goto tx_err;

	hh_len = LL_RESERVED_SPACE(out_dev);
	if (!out_dev->header_ops)
		hh_len = 0;

	/* Ensure there is enough space for the headers in the skb */
	if (skb_cow(skb, hh_len + new_header_size))
		goto tx_err;

	skb->dev = out_dev;
	skb->protocol = htons(ETH_P_MPLS_UC);

	if (unlikely(!new_header_size && dec.bos)) {
		/* Penultimate hop popping */
		if (!mpls_egress(rt, skb, dec))
			goto err;
	} else {
		bool bos;
		int i;
		skb_push(skb, new_header_size);
		skb_reset_network_header(skb);
		/* Push the new labels */
		hdr = mpls_hdr(skb);
		bos = dec.bos;
		for (i = nh->nh_labels - 1; i >= 0; i--) {
			hdr[i] = mpls_entry_encode(nh->nh_label[i],
						   dec.ttl, 0, bos);
			bos = false;
		}
	}

	mpls_stats_inc_outucastpkts(out_dev, skb);

	/* If via wasn't specified then send out using device address */
	if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC)
		err = neigh_xmit(NEIGH_LINK_TABLE, out_dev,
				 out_dev->dev_addr, skb);
	else
		err = neigh_xmit(nh->nh_via_table, out_dev,
				 mpls_nh_via(rt, nh), skb);
	if (err)
		net_dbg_ratelimited("%s: packet transmission failed: %d\n",
				    __func__, err);
	return 0;

tx_err:
	out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL;
	if (out_mdev)
		MPLS_INC_STATS(out_mdev, tx_errors);
	goto drop;
err:
	MPLS_INC_STATS(mdev, rx_errors);
drop:
	kfree_skb(skb);
	return NET_RX_DROP;
}


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Total617100.00%10100.00%




static struct packet_type mpls_packet_type __read_mostly = {
	.type = cpu_to_be16(ETH_P_MPLS_UC),
	.func = mpls_forward,
};


static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = {
	[RTA_DST]		= { .type = NLA_U32 },
	[RTA_OIF]		= { .type = NLA_U32 },
};


struct mpls_route_config {
	
u32			rc_protocol;
	
u32			rc_ifindex;
	
u8			rc_via_table;
	
u8			rc_via_alen;
	
u8			rc_via[MAX_VIA_ALEN];
	
u32			rc_label;
	
u8			rc_output_labels;
	
u32			rc_output_label[MAX_NEW_LABELS];
	
u32			rc_nlflags;
	
enum mpls_payload_type	rc_payload_type;
	
struct nl_info		rc_nlinfo;
	
struct rtnexthop	*rc_mp;
	
int			rc_mp_len;
};




static struct mpls_route *mpls_rt_alloc(int num_nh, u8 max_alen)
{
	u8 max_alen_aligned = ALIGN(max_alen, VIA_ALEN_ALIGN);
	struct mpls_route *rt;

	rt = kzalloc(ALIGN(sizeof(*rt) + num_nh * sizeof(*rt->rt_nh),
			   VIA_ALEN_ALIGN) +
		     num_nh * max_alen_aligned,
		     GFP_KERNEL);
	if (rt) {
		rt->rt_nhn = num_nh;
		rt->rt_nhn_alive = num_nh;
		rt->rt_max_alen = max_alen_aligned;
	}

	return rt;
}


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static void mpls_rt_free(struct mpls_route *rt)
{
	if (rt)
		kfree_rcu(rt, rt_rcu);
}


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static void mpls_notify_route(struct net *net, unsigned index,
			      struct mpls_route *old, struct mpls_route *new,
			      const struct nl_info *info)
{
	struct nlmsghdr *nlh = info ? info->nlh : NULL;
	unsigned portid = info ? info->portid : 0;
	int event = new ? RTM_NEWROUTE : RTM_DELROUTE;
	struct mpls_route *rt = new ? new : old;
	unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0;
	/* Ignore reserved labels for now */
	if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED))
		rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags);
}


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static void mpls_route_update(struct net *net, unsigned index,
			      struct mpls_route *new,
			      const struct nl_info *info)
{
	struct mpls_route __rcu **platform_label;
	struct mpls_route *rt;

	ASSERT_RTNL();

	platform_label = rtnl_dereference(net->mpls.platform_label);
	rt = rtnl_dereference(platform_label[index]);
	rcu_assign_pointer(platform_label[index], new);

	mpls_notify_route(net, index, rt, new, info);

	/* If we removed a route free it now */
	mpls_rt_free(rt);
}


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static unsigned find_free_label(struct net *net)
{
	struct mpls_route __rcu **platform_label;
	size_t platform_labels;
	unsigned index;

	platform_label = rtnl_dereference(net->mpls.platform_label);
	platform_labels = net->mpls.platform_labels;
	for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels;
	     index++) {
		if (!rtnl_dereference(platform_label[index]))
			return index;
	}
	return LABEL_NOT_SPECIFIED;
}


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#if IS_ENABLED(CONFIG_INET)



static struct net_device *inet_fib_lookup_dev(struct net *net,
					      const void *addr)
{
	struct net_device *dev;
	struct rtable *rt;
	struct in_addr daddr;

	memcpy(&daddr, addr, sizeof(struct in_addr));
	rt = ip_route_output(net, daddr.s_addr, 0, 0, 0);
	if (IS_ERR(rt))
		return ERR_CAST(rt);

	dev = rt->dst.dev;
	dev_hold(dev);

	ip_rt_put(rt);

	return dev;
}

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#else



static struct net_device *inet_fib_lookup_dev(struct net *net,
					      const void *addr)
{
	return ERR_PTR(-EAFNOSUPPORT);
}

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#endif

#if IS_ENABLED(CONFIG_IPV6)



static struct net_device *inet6_fib_lookup_dev(struct net *net,
					       const void *addr)
{
	struct net_device *dev;
	struct dst_entry *dst;
	struct flowi6 fl6;
	int err;

	if (!ipv6_stub)
		return ERR_PTR(-EAFNOSUPPORT);

	memset(&fl6, 0, sizeof(fl6));
	memcpy(&fl6.daddr, addr, sizeof(struct in6_addr));
	err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6);
	if (err)
		return ERR_PTR(err);

	dev = dst->dev;
	dev_hold(dev);
	dst_release(dst);

	return dev;
}

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#else



static struct net_device *inet6_fib_lookup_dev(struct net *net,
					       const void *addr)
{
	return ERR_PTR(-EAFNOSUPPORT);
}

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#endif




static struct net_device *find_outdev(struct net *net,
				      struct mpls_route *rt,
				      struct mpls_nh *nh, int oif)
{
	struct net_device *dev = NULL;

	if (!oif) {
		switch (nh->nh_via_table) {
		case NEIGH_ARP_TABLE:
			dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh));
			break;
		case NEIGH_ND_TABLE:
			dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh));
			break;
		case NEIGH_LINK_TABLE:
			break;
		}
	} else {
		dev = dev_get_by_index(net, oif);
	}

	if (!dev)
		return ERR_PTR(-ENODEV);

	if (IS_ERR(dev))
		return dev;

	/* The caller is holding rtnl anyways, so release the dev reference */
	dev_put(dev);

	return dev;
}


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static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt,
			      struct mpls_nh *nh, int oif)
{
	struct net_device *dev = NULL;
	int err = -ENODEV;

	dev = find_outdev(net, rt, nh, oif);
	if (IS_ERR(dev)) {
		err = PTR_ERR(dev);
		dev = NULL;
		goto errout;
	}

	/* Ensure this is a supported device */
	err = -EINVAL;
	if (!mpls_dev_get(dev))
		goto errout;

	if ((nh->nh_via_table == NEIGH_LINK_TABLE) &&
	    (dev->addr_len != nh->nh_via_alen))
		goto errout;

	RCU_INIT_POINTER(nh->nh_dev, dev);

	if (!(dev->flags & IFF_UP)) {
		nh->nh_flags |= RTNH_F_DEAD;
	} else {
		unsigned int flags;

		flags = dev_get_flags(dev);
		if (!(flags & (IFF_RUNNING | IFF_LOWER_UP)))
			nh->nh_flags |= RTNH_F_LINKDOWN;
	}

	return 0;

errout:
	return err;
}


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Robert Shearman3016.48%240.00%


Eric W. Biedermann2312.64%120.00%


Total182100.00%5100.00%






static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg,
				  struct mpls_route *rt)
{
	struct net *net = cfg->rc_nlinfo.nl_net;
	struct mpls_nh *nh = rt->rt_nh;
	int err;
	int i;

	if (!nh)
		return -ENOMEM;

	err = -EINVAL;
	/* Ensure only a supported number of labels are present */
	if (cfg->rc_output_labels > MAX_NEW_LABELS)
		goto errout;

	nh->nh_labels = cfg->rc_output_labels;
	for (i = 0; i < nh->nh_labels; i++)
		nh->nh_label[i] = cfg->rc_output_label[i];

	nh->nh_via_table = cfg->rc_via_table;
	memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen);
	nh->nh_via_alen = cfg->rc_via_alen;

	err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex);
	if (err)
		goto errout;

	if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
		rt->rt_nhn_alive--;

	return 0;

errout:
	return err;
}


Contributors
PersonTokensPropCommitsCommitProp
Roopa Prabhu17795.16%250.00%


Robert Shearman73.76%125.00%


Eric W. Biedermann21.08%125.00%


Total186100.00%4100.00%






static int mpls_nh_build(struct net *net,