v4.19.13 snapshot.
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
new file mode 100644
index 0000000..8fbe6cd
--- /dev/null
+++ b/net/mpls/af_mpls.c
@@ -0,0 +1,2557 @@
+#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/nospec.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/ip_tunnels.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"
+
+/* max memory we will use for mpls_route */
+#define MAX_MPLS_ROUTE_MEM 4096
+
+/* 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 one = 1;
+static int label_limit = (1 << 20) - 1;
+static int ttl_max = 255;
+
+#if IS_ENABLED(CONFIG_NET_IP_TUNNEL)
+static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e)
+{
+ return sizeof(struct mpls_shim_hdr);
+}
+
+static const struct ip_tunnel_encap_ops mpls_iptun_ops = {
+ .encap_hlen = ipgre_mpls_encap_hlen,
+};
+
+static int ipgre_tunnel_encap_add_mpls_ops(void)
+{
+ return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
+}
+
+static void ipgre_tunnel_encap_del_mpls_ops(void)
+{
+ ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
+}
+#else
+static int ipgre_tunnel_encap_add_mpls_ops(void)
+{
+ return 0;
+}
+
+static void ipgre_tunnel_encap_del_mpls_ops(void)
+{
+}
+#endif
+
+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;
+}
+
+bool mpls_output_possible(const struct net_device *dev)
+{
+ return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev);
+}
+EXPORT_SYMBOL_GPL(mpls_output_possible);
+
+static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh)
+{
+ return (u8 *)nh + rt->rt_via_offset;
+}
+
+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);
+}
+
+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);
+}
+
+unsigned int mpls_dev_mtu(const struct net_device *dev)
+{
+ /* The amount of data the layer 2 frame can hold */
+ return dev->mtu;
+}
+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_network_len(skb, mtu))
+ return false;
+
+ return true;
+}
+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
+ }
+}
+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;
+}
+
+static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index)
+{
+ return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size);
+}
+
+/* number of alive nexthops (rt->rt_nhn_alive) and the flags for
+ * a next hop (nh->nh_flags) are modified by netdev event handlers.
+ * Since those fields can change at any moment, use READ_ONCE to
+ * access both.
+ */
+static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt,
+ struct sk_buff *skb)
+{
+ u32 hash = 0;
+ int nh_index = 0;
+ int n = 0;
+ u8 alive;
+
+ /* No need to look further into packet if there's only
+ * one path
+ */
+ if (rt->rt_nhn == 1)
+ return rt->rt_nh;
+
+ alive = READ_ONCE(rt->rt_nhn_alive);
+ 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) {
+ unsigned int nh_flags = READ_ONCE(nh->nh_flags);
+
+ if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
+ continue;
+ if (n == nh_index)
+ return nh;
+ n++;
+ } endfor_nexthops(rt);
+
+out:
+ return mpls_get_nexthop(rt, nh_index);
+}
+
+static bool mpls_egress(struct net *net, 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);
+ u8 new_ttl;
+ skb->protocol = htons(ETH_P_IP);
+
+ /* If propagating TTL, take the decremented TTL from
+ * the incoming MPLS header, otherwise decrement the
+ * TTL, but only if not 0 to avoid underflow.
+ */
+ if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED ||
+ (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
+ net->mpls.ip_ttl_propagate))
+ new_ttl = dec.ttl;
+ else
+ new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0;
+
+ csum_replace2(&hdr4->check,
+ htons(hdr4->ttl << 8),
+ htons(new_ttl << 8));
+ hdr4->ttl = new_ttl;
+ success = true;
+ break;
+ }
+ case MPT_IPV6: {
+ struct ipv6hdr *hdr6 = ipv6_hdr(skb);
+ skb->protocol = htons(ETH_P_IPV6);
+
+ /* If propagating TTL, take the decremented TTL from
+ * the incoming MPLS header, otherwise decrement the
+ * hop limit, but only if not 0 to avoid underflow.
+ */
+ if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED ||
+ (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
+ net->mpls.ip_ttl_propagate))
+ hdr6->hop_limit = dec.ttl;
+ else if (hdr6->hop_limit)
+ hdr6->hop_limit = hdr6->hop_limit - 1;
+ success = true;
+ break;
+ }
+ case MPT_UNSPEC:
+ /* Should have decided which protocol it is by now */
+ break;
+ }
+
+ return success;
+}
+
+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(dev_net(out_dev), 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;
+}
+
+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 },
+ [RTA_TTL_PROPAGATE] = { .type = NLA_U8 },
+};
+
+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_ttl_propagate;
+ 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;
+};
+
+/* all nexthops within a route have the same size based on max
+ * number of labels and max via length for a hop
+ */
+static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels)
+{
+ u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen);
+ struct mpls_route *rt;
+ size_t size;
+
+ size = sizeof(*rt) + num_nh * nh_size;
+ if (size > MAX_MPLS_ROUTE_MEM)
+ return ERR_PTR(-EINVAL);
+
+ rt = kzalloc(size, GFP_KERNEL);
+ if (!rt)
+ return ERR_PTR(-ENOMEM);
+
+ rt->rt_nhn = num_nh;
+ rt->rt_nhn_alive = num_nh;
+ rt->rt_nh_size = nh_size;
+ rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels);
+
+ return rt;
+}
+
+static void mpls_rt_free(struct mpls_route *rt)
+{
+ if (rt)
+ kfree_rcu(rt, rt_rcu);
+}
+
+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);
+}
+
+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);
+}
+
+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;
+}
+
+#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;
+}
+#else
+static struct net_device *inet_fib_lookup_dev(struct net *net,
+ const void *addr)
+{
+ return ERR_PTR(-EAFNOSUPPORT);
+}
+#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;
+}
+#else
+static struct net_device *inet6_fib_lookup_dev(struct net *net,
+ const void *addr)
+{
+ return ERR_PTR(-EAFNOSUPPORT);
+}
+#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;
+}
+
+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;
+}
+
+static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
+ u8 via_addr[], struct netlink_ext_ack *extack)
+{
+ struct rtvia *via = nla_data(nla);
+ int err = -EINVAL;
+ int alen;
+
+ if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) {
+ NL_SET_ERR_MSG_ATTR(extack, nla,
+ "Invalid attribute length for RTA_VIA");
+ goto errout;
+ }
+ alen = nla_len(nla) -
+ offsetof(struct rtvia, rtvia_addr);
+ if (alen > MAX_VIA_ALEN) {
+ NL_SET_ERR_MSG_ATTR(extack, nla,
+ "Invalid address length for RTA_VIA");
+ goto errout;
+ }
+
+ /* Validate the address family */
+ switch (via->rtvia_family) {
+ case AF_PACKET:
+ *via_table = NEIGH_LINK_TABLE;
+ break;
+ case AF_INET:
+ *via_table = NEIGH_ARP_TABLE;
+ if (alen != 4)
+ goto errout;
+ break;
+ case AF_INET6:
+ *via_table = NEIGH_ND_TABLE;
+ if (alen != 16)
+ goto errout;
+ break;
+ default:
+ /* Unsupported address family */
+ goto errout;
+ }
+
+ memcpy(via_addr, via->rtvia_addr, alen);
+ *via_alen = alen;
+ err = 0;
+
+errout:
+ return err;
+}
+
+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;
+
+ 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;
+}
+
+static int mpls_nh_build(struct net *net, struct mpls_route *rt,
+ struct mpls_nh *nh, int oif, struct nlattr *via,
+ struct nlattr *newdst, u8 max_labels,
+ struct netlink_ext_ack *extack)
+{
+ int err = -ENOMEM;
+
+ if (!nh)
+ goto errout;
+
+ if (newdst) {
+ err = nla_get_labels(newdst, max_labels, &nh->nh_labels,
+ nh->nh_label, extack);
+ if (err)
+ goto errout;
+ }
+
+ if (via) {
+ err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table,
+ __mpls_nh_via(rt, nh), extack);
+ if (err)
+ goto errout;
+ } else {
+ nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC;
+ }
+
+ err = mpls_nh_assign_dev(net, rt, nh, oif);
+ if (err)
+ goto errout;
+
+ return 0;
+
+errout:
+ return err;
+}
+
+static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len,
+ u8 cfg_via_alen, u8 *max_via_alen,
+ u8 *max_labels)
+{
+ int remaining = len;
+ u8 nhs = 0;
+
+ *max_via_alen = 0;
+ *max_labels = 0;
+
+ while (rtnh_ok(rtnh, remaining)) {
+ struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
+ int attrlen;
+ u8 n_labels = 0;
+
+ attrlen = rtnh_attrlen(rtnh);
+ nla = nla_find(attrs, attrlen, RTA_VIA);
+ if (nla && nla_len(nla) >=
+ offsetof(struct rtvia, rtvia_addr)) {
+ int via_alen = nla_len(nla) -
+ offsetof(struct rtvia, rtvia_addr);
+
+ if (via_alen <= MAX_VIA_ALEN)
+ *max_via_alen = max_t(u16, *max_via_alen,
+ via_alen);
+ }
+
+ nla = nla_find(attrs, attrlen, RTA_NEWDST);
+ if (nla &&
+ nla_get_labels(nla, MAX_NEW_LABELS, &n_labels,
+ NULL, NULL) != 0)
+ return 0;
+
+ *max_labels = max_t(u8, *max_labels, n_labels);
+
+ /* number of nexthops is tracked by a u8.
+ * Check for overflow.
+ */
+ if (nhs == 255)
+ return 0;
+ nhs++;
+
+ rtnh = rtnh_next(rtnh, &remaining);
+ }
+
+ /* leftover implies invalid nexthop configuration, discard it */
+ return remaining > 0 ? 0 : nhs;
+}
+
+static int mpls_nh_build_multi(struct mpls_route_config *cfg,
+ struct mpls_route *rt, u8 max_labels,
+ struct netlink_ext_ack *extack)
+{
+ struct rtnexthop *rtnh = cfg->rc_mp;
+ struct nlattr *nla_via, *nla_newdst;
+ int remaining = cfg->rc_mp_len;
+ int err = 0;
+ u8 nhs = 0;
+
+ change_nexthops(rt) {
+ int attrlen;
+
+ nla_via = NULL;
+ nla_newdst = NULL;
+
+ err = -EINVAL;
+ if (!rtnh_ok(rtnh, remaining))
+ goto errout;
+
+ /* neither weighted multipath nor any flags
+ * are supported
+ */
+ if (rtnh->rtnh_hops || rtnh->rtnh_flags)
+ goto errout;
+
+ attrlen = rtnh_attrlen(rtnh);
+ if (attrlen > 0) {
+ struct nlattr *attrs = rtnh_attrs(rtnh);
+
+ nla_via = nla_find(attrs, attrlen, RTA_VIA);
+ nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST);
+ }
+
+ err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh,
+ rtnh->rtnh_ifindex, nla_via, nla_newdst,
+ max_labels, extack);
+ if (err)
+ goto errout;
+
+ if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))
+ rt->rt_nhn_alive--;
+
+ rtnh = rtnh_next(rtnh, &remaining);
+ nhs++;
+ } endfor_nexthops(rt);
+
+ rt->rt_nhn = nhs;
+
+ return 0;
+
+errout:
+ return err;
+}
+
+static bool mpls_label_ok(struct net *net, unsigned int *index,
+ struct netlink_ext_ack *extack)
+{
+ bool is_ok = true;
+
+ /* Reserved labels may not be set */
+ if (*index < MPLS_LABEL_FIRST_UNRESERVED) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher");
+ is_ok = false;
+ }
+
+ /* The full 20 bit range may not be supported. */
+ if (is_ok && *index >= net->mpls.platform_labels) {
+ NL_SET_ERR_MSG(extack,
+ "Label >= configured maximum in platform_labels");
+ is_ok = false;
+ }
+
+ *index = array_index_nospec(*index, net->mpls.platform_labels);
+ return is_ok;
+}
+
+static int mpls_route_add(struct mpls_route_config *cfg,
+ struct netlink_ext_ack *extack)
+{
+ struct mpls_route __rcu **platform_label;
+ struct net *net = cfg->rc_nlinfo.nl_net;
+ struct mpls_route *rt, *old;
+ int err = -EINVAL;
+ u8 max_via_alen;
+ unsigned index;
+ u8 max_labels;
+ u8 nhs;
+
+ index = cfg->rc_label;
+
+ /* If a label was not specified during insert pick one */
+ if ((index == LABEL_NOT_SPECIFIED) &&
+ (cfg->rc_nlflags & NLM_F_CREATE)) {
+ index = find_free_label(net);
+ }
+
+ if (!mpls_label_ok(net, &index, extack))
+ goto errout;
+
+ /* Append makes no sense with mpls */
+ err = -EOPNOTSUPP;
+ if (cfg->rc_nlflags & NLM_F_APPEND) {
+ NL_SET_ERR_MSG(extack, "MPLS does not support route append");
+ goto errout;
+ }
+
+ err = -EEXIST;
+ platform_label = rtnl_dereference(net->mpls.platform_label);
+ old = rtnl_dereference(platform_label[index]);
+ if ((cfg->rc_nlflags & NLM_F_EXCL) && old)
+ goto errout;
+
+ err = -EEXIST;
+ if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old)
+ goto errout;
+
+ err = -ENOENT;
+ if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old)
+ goto errout;
+
+ err = -EINVAL;
+ if (cfg->rc_mp) {
+ nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len,
+ cfg->rc_via_alen, &max_via_alen,
+ &max_labels);
+ } else {
+ max_via_alen = cfg->rc_via_alen;
+ max_labels = cfg->rc_output_labels;
+ nhs = 1;
+ }
+
+ if (nhs == 0) {
+ NL_SET_ERR_MSG(extack, "Route does not contain a nexthop");
+ goto errout;
+ }
+
+ err = -ENOMEM;
+ rt = mpls_rt_alloc(nhs, max_via_alen, max_labels);
+ if (IS_ERR(rt)) {
+ err = PTR_ERR(rt);
+ goto errout;
+ }
+
+ rt->rt_protocol = cfg->rc_protocol;
+ rt->rt_payload_type = cfg->rc_payload_type;
+ rt->rt_ttl_propagate = cfg->rc_ttl_propagate;
+
+ if (cfg->rc_mp)
+ err = mpls_nh_build_multi(cfg, rt, max_labels, extack);
+ else
+ err = mpls_nh_build_from_cfg(cfg, rt);
+ if (err)
+ goto freert;
+
+ mpls_route_update(net, index, rt, &cfg->rc_nlinfo);
+
+ return 0;
+
+freert:
+ mpls_rt_free(rt);
+errout:
+ return err;
+}
+
+static int mpls_route_del(struct mpls_route_config *cfg,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = cfg->rc_nlinfo.nl_net;
+ unsigned index;
+ int err = -EINVAL;
+
+ index = cfg->rc_label;
+
+ if (!mpls_label_ok(net, &index, extack))
+ goto errout;
+
+ mpls_route_update(net, index, NULL, &cfg->rc_nlinfo);
+
+ err = 0;
+errout:
+ return err;
+}
+
+static void mpls_get_stats(struct mpls_dev *mdev,
+ struct mpls_link_stats *stats)
+{
+ struct mpls_pcpu_stats *p;
+ int i;
+
+ memset(stats, 0, sizeof(*stats));
+
+ for_each_possible_cpu(i) {
+ struct mpls_link_stats local;
+ unsigned int start;
+
+ p = per_cpu_ptr(mdev->stats, i);
+ do {
+ start = u64_stats_fetch_begin(&p->syncp);
+ local = p->stats;
+ } while (u64_stats_fetch_retry(&p->syncp, start));
+
+ stats->rx_packets += local.rx_packets;
+ stats->rx_bytes += local.rx_bytes;
+ stats->tx_packets += local.tx_packets;
+ stats->tx_bytes += local.tx_bytes;
+ stats->rx_errors += local.rx_errors;
+ stats->tx_errors += local.tx_errors;
+ stats->rx_dropped += local.rx_dropped;
+ stats->tx_dropped += local.tx_dropped;
+ stats->rx_noroute += local.rx_noroute;
+ }
+}
+
+static int mpls_fill_stats_af(struct sk_buff *skb,
+ const struct net_device *dev)
+{
+ struct mpls_link_stats *stats;
+ struct mpls_dev *mdev;
+ struct nlattr *nla;
+
+ mdev = mpls_dev_get(dev);
+ if (!mdev)
+ return -ENODATA;
+
+ nla = nla_reserve_64bit(skb, MPLS_STATS_LINK,
+ sizeof(struct mpls_link_stats),
+ MPLS_STATS_UNSPEC);
+ if (!nla)
+ return -EMSGSIZE;
+
+ stats = nla_data(nla);
+ mpls_get_stats(mdev, stats);
+
+ return 0;
+}
+
+static size_t mpls_get_stats_af_size(const struct net_device *dev)
+{
+ struct mpls_dev *mdev;
+
+ mdev = mpls_dev_get(dev);
+ if (!mdev)
+ return 0;
+
+ return nla_total_size_64bit(sizeof(struct mpls_link_stats));
+}
+
+static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev,
+ u32 portid, u32 seq, int event,
+ unsigned int flags, int type)
+{
+ struct nlmsghdr *nlh;
+ struct netconfmsg *ncm;
+ bool all = false;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
+ flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ if (type == NETCONFA_ALL)
+ all = true;
+
+ ncm = nlmsg_data(nlh);
+ ncm->ncm_family = AF_MPLS;
+
+ if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0)
+ goto nla_put_failure;
+
+ if ((all || type == NETCONFA_INPUT) &&
+ nla_put_s32(skb, NETCONFA_INPUT,
+ mdev->input_enabled) < 0)
+ goto nla_put_failure;
+
+ nlmsg_end(skb, nlh);
+ return 0;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+static int mpls_netconf_msgsize_devconf(int type)
+{
+ int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
+ + nla_total_size(4); /* NETCONFA_IFINDEX */
+ bool all = false;
+
+ if (type == NETCONFA_ALL)
+ all = true;
+
+ if (all || type == NETCONFA_INPUT)
+ size += nla_total_size(4);
+
+ return size;
+}
+
+static void mpls_netconf_notify_devconf(struct net *net, int event,
+ int type, struct mpls_dev *mdev)
+{
+ struct sk_buff *skb;
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL);
+ if (!skb)
+ goto errout;
+
+ err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+
+ rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL);
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err);
+}
+
+static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = {
+ [NETCONFA_IFINDEX] = { .len = sizeof(int) },
+};
+
+static int mpls_netconf_get_devconf(struct sk_buff *in_skb,
+ struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(in_skb->sk);
+ struct nlattr *tb[NETCONFA_MAX + 1];
+ struct netconfmsg *ncm;
+ struct net_device *dev;
+ struct mpls_dev *mdev;
+ struct sk_buff *skb;
+ int ifindex;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
+ devconf_mpls_policy, NULL);
+ if (err < 0)
+ goto errout;
+
+ err = -EINVAL;
+ if (!tb[NETCONFA_IFINDEX])
+ goto errout;
+
+ ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
+ dev = __dev_get_by_index(net, ifindex);
+ if (!dev)
+ goto errout;
+
+ mdev = mpls_dev_get(dev);
+ if (!mdev)
+ goto errout;
+
+ err = -ENOBUFS;
+ skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
+ if (!skb)
+ goto errout;
+
+ err = mpls_netconf_fill_devconf(skb, mdev,
+ NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
+ NETCONFA_ALL);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
+errout:
+ return err;
+}
+
+static int mpls_netconf_dump_devconf(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ struct hlist_head *head;
+ struct net_device *dev;
+ struct mpls_dev *mdev;
+ int idx, s_idx;
+ int h, s_h;
+
+ s_h = cb->args[0];
+ s_idx = idx = cb->args[1];
+
+ for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
+ idx = 0;
+ head = &net->dev_index_head[h];
+ rcu_read_lock();
+ cb->seq = net->dev_base_seq;
+ hlist_for_each_entry_rcu(dev, head, index_hlist) {
+ if (idx < s_idx)
+ goto cont;
+ mdev = mpls_dev_get(dev);
+ if (!mdev)
+ goto cont;
+ if (mpls_netconf_fill_devconf(skb, mdev,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWNETCONF,
+ NLM_F_MULTI,
+ NETCONFA_ALL) < 0) {
+ rcu_read_unlock();
+ goto done;
+ }
+ nl_dump_check_consistent(cb, nlmsg_hdr(skb));
+cont:
+ idx++;
+ }
+ rcu_read_unlock();
+ }
+done:
+ cb->args[0] = h;
+ cb->args[1] = idx;
+
+ return skb->len;
+}
+
+#define MPLS_PERDEV_SYSCTL_OFFSET(field) \
+ (&((struct mpls_dev *)0)->field)
+
+static int mpls_conf_proc(struct ctl_table *ctl, int write,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ int oval = *(int *)ctl->data;
+ int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
+
+ if (write) {
+ struct mpls_dev *mdev = ctl->extra1;
+ int i = (int *)ctl->data - (int *)mdev;
+ struct net *net = ctl->extra2;
+ int val = *(int *)ctl->data;
+
+ if (i == offsetof(struct mpls_dev, input_enabled) &&
+ val != oval) {
+ mpls_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_INPUT, mdev);
+ }
+ }
+
+ return ret;
+}
+
+static const struct ctl_table mpls_dev_table[] = {
+ {
+ .procname = "input",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = mpls_conf_proc,
+ .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled),
+ },
+ { }
+};
+
+static int mpls_dev_sysctl_register(struct net_device *dev,
+ struct mpls_dev *mdev)
+{
+ char path[sizeof("net/mpls/conf/") + IFNAMSIZ];
+ struct net *net = dev_net(dev);
+ struct ctl_table *table;
+ int i;
+
+ table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL);
+ if (!table)
+ goto out;
+
+ /* Table data contains only offsets relative to the base of
+ * the mdev at this point, so make them absolute.
+ */
+ for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) {
+ table[i].data = (char *)mdev + (uintptr_t)table[i].data;
+ table[i].extra1 = mdev;
+ table[i].extra2 = net;
+ }
+
+ snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name);
+
+ mdev->sysctl = register_net_sysctl(net, path, table);
+ if (!mdev->sysctl)
+ goto free;
+
+ mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev);
+ return 0;
+
+free:
+ kfree(table);
+out:
+ return -ENOBUFS;
+}
+
+static void mpls_dev_sysctl_unregister(struct net_device *dev,
+ struct mpls_dev *mdev)
+{
+ struct net *net = dev_net(dev);
+ struct ctl_table *table;
+
+ table = mdev->sysctl->ctl_table_arg;
+ unregister_net_sysctl_table(mdev->sysctl);
+ kfree(table);
+
+ mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev);
+}
+
+static struct mpls_dev *mpls_add_dev(struct net_device *dev)
+{
+ struct mpls_dev *mdev;
+ int err = -ENOMEM;
+ int i;
+
+ ASSERT_RTNL();
+
+ mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
+ if (!mdev)
+ return ERR_PTR(err);
+
+ mdev->stats = alloc_percpu(struct mpls_pcpu_stats);
+ if (!mdev->stats)
+ goto free;
+
+ for_each_possible_cpu(i) {
+ struct mpls_pcpu_stats *mpls_stats;
+
+ mpls_stats = per_cpu_ptr(mdev->stats, i);
+ u64_stats_init(&mpls_stats->syncp);
+ }
+
+ mdev->dev = dev;
+
+ err = mpls_dev_sysctl_register(dev, mdev);
+ if (err)
+ goto free;
+
+ rcu_assign_pointer(dev->mpls_ptr, mdev);
+
+ return mdev;
+
+free:
+ free_percpu(mdev->stats);
+ kfree(mdev);
+ return ERR_PTR(err);
+}
+
+static void mpls_dev_destroy_rcu(struct rcu_head *head)
+{
+ struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu);
+
+ free_percpu(mdev->stats);
+ kfree(mdev);
+}
+
+static void mpls_ifdown(struct net_device *dev, int event)
+{
+ struct mpls_route __rcu **platform_label;
+ struct net *net = dev_net(dev);
+ u8 alive, deleted;
+ unsigned index;
+
+ platform_label = rtnl_dereference(net->mpls.platform_label);
+ for (index = 0; index < net->mpls.platform_labels; index++) {
+ struct mpls_route *rt = rtnl_dereference(platform_label[index]);
+
+ if (!rt)
+ continue;
+
+ alive = 0;
+ deleted = 0;
+ change_nexthops(rt) {
+ unsigned int nh_flags = nh->nh_flags;
+
+ if (rtnl_dereference(nh->nh_dev) != dev)
+ goto next;
+
+ switch (event) {
+ case NETDEV_DOWN:
+ case NETDEV_UNREGISTER:
+ nh_flags |= RTNH_F_DEAD;
+ /* fall through */
+ case NETDEV_CHANGE:
+ nh_flags |= RTNH_F_LINKDOWN;
+ break;
+ }
+ if (event == NETDEV_UNREGISTER)
+ RCU_INIT_POINTER(nh->nh_dev, NULL);
+
+ if (nh->nh_flags != nh_flags)
+ WRITE_ONCE(nh->nh_flags, nh_flags);
+next:
+ if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)))
+ alive++;
+ if (!rtnl_dereference(nh->nh_dev))
+ deleted++;
+ } endfor_nexthops(rt);
+
+ WRITE_ONCE(rt->rt_nhn_alive, alive);
+
+ /* if there are no more nexthops, delete the route */
+ if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn)
+ mpls_route_update(net, index, NULL, NULL);
+ }
+}
+
+static void mpls_ifup(struct net_device *dev, unsigned int flags)
+{
+ struct mpls_route __rcu **platform_label;
+ struct net *net = dev_net(dev);
+ unsigned index;
+ u8 alive;
+
+ platform_label = rtnl_dereference(net->mpls.platform_label);
+ for (index = 0; index < net->mpls.platform_labels; index++) {
+ struct mpls_route *rt = rtnl_dereference(platform_label[index]);
+
+ if (!rt)
+ continue;
+
+ alive = 0;
+ change_nexthops(rt) {
+ unsigned int nh_flags = nh->nh_flags;
+ struct net_device *nh_dev =
+ rtnl_dereference(nh->nh_dev);
+
+ if (!(nh_flags & flags)) {
+ alive++;
+ continue;
+ }
+ if (nh_dev != dev)
+ continue;
+ alive++;
+ nh_flags &= ~flags;
+ WRITE_ONCE(nh->nh_flags, nh_flags);
+ } endfor_nexthops(rt);
+
+ WRITE_ONCE(rt->rt_nhn_alive, alive);
+ }
+}
+
+static int mpls_dev_notify(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct mpls_dev *mdev;
+ unsigned int flags;
+
+ if (event == NETDEV_REGISTER) {
+
+ /* For now just support Ethernet, IPGRE, IP6GRE, SIT and
+ * IPIP devices
+ */
+ if (dev->type == ARPHRD_ETHER ||
+ dev->type == ARPHRD_LOOPBACK ||
+ dev->type == ARPHRD_IPGRE ||
+ dev->type == ARPHRD_IP6GRE ||
+ dev->type == ARPHRD_SIT ||
+ dev->type == ARPHRD_TUNNEL) {
+ mdev = mpls_add_dev(dev);
+ if (IS_ERR(mdev))
+ return notifier_from_errno(PTR_ERR(mdev));
+ }
+ return NOTIFY_OK;
+ }
+
+ mdev = mpls_dev_get(dev);
+ if (!mdev)
+ return NOTIFY_OK;
+
+ switch (event) {
+ case NETDEV_DOWN:
+ mpls_ifdown(dev, event);
+ break;
+ case NETDEV_UP:
+ flags = dev_get_flags(dev);
+ if (flags & (IFF_RUNNING | IFF_LOWER_UP))
+ mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
+ else
+ mpls_ifup(dev, RTNH_F_DEAD);
+ break;
+ case NETDEV_CHANGE:
+ flags = dev_get_flags(dev);
+ if (flags & (IFF_RUNNING | IFF_LOWER_UP))
+ mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN);
+ else
+ mpls_ifdown(dev, event);
+ break;
+ case NETDEV_UNREGISTER:
+ mpls_ifdown(dev, event);
+ mdev = mpls_dev_get(dev);
+ if (mdev) {
+ mpls_dev_sysctl_unregister(dev, mdev);
+ RCU_INIT_POINTER(dev->mpls_ptr, NULL);
+ call_rcu(&mdev->rcu, mpls_dev_destroy_rcu);
+ }
+ break;
+ case NETDEV_CHANGENAME:
+ mdev = mpls_dev_get(dev);
+ if (mdev) {
+ int err;
+
+ mpls_dev_sysctl_unregister(dev, mdev);
+ err = mpls_dev_sysctl_register(dev, mdev);
+ if (err)
+ return notifier_from_errno(err);
+ }
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block mpls_dev_notifier = {
+ .notifier_call = mpls_dev_notify,
+};
+
+static int nla_put_via(struct sk_buff *skb,
+ u8 table, const void *addr, int alen)
+{
+ static const int table_to_family[NEIGH_NR_TABLES + 1] = {
+ AF_INET, AF_INET6, AF_DECnet, AF_PACKET,
+ };
+ struct nlattr *nla;
+ struct rtvia *via;
+ int family = AF_UNSPEC;
+
+ nla = nla_reserve(skb, RTA_VIA, alen + 2);
+ if (!nla)
+ return -EMSGSIZE;
+
+ if (table <= NEIGH_NR_TABLES)
+ family = table_to_family[table];
+
+ via = nla_data(nla);
+ via->rtvia_family = family;
+ memcpy(via->rtvia_addr, addr, alen);
+ return 0;
+}
+
+int nla_put_labels(struct sk_buff *skb, int attrtype,
+ u8 labels, const u32 label[])
+{
+ struct nlattr *nla;
+ struct mpls_shim_hdr *nla_label;
+ bool bos;
+ int i;
+ nla = nla_reserve(skb, attrtype, labels*4);
+ if (!nla)
+ return -EMSGSIZE;
+
+ nla_label = nla_data(nla);
+ bos = true;
+ for (i = labels - 1; i >= 0; i--) {
+ nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos);
+ bos = false;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nla_put_labels);
+
+int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
+ u32 label[], struct netlink_ext_ack *extack)
+{
+ unsigned len = nla_len(nla);
+ struct mpls_shim_hdr *nla_label;
+ u8 nla_labels;
+ bool bos;
+ int i;
+
+ /* len needs to be an even multiple of 4 (the label size). Number
+ * of labels is a u8 so check for overflow.
+ */
+ if (len & 3 || len / 4 > 255) {
+ NL_SET_ERR_MSG_ATTR(extack, nla,
+ "Invalid length for labels attribute");
+ return -EINVAL;
+ }
+
+ /* Limit the number of new labels allowed */
+ nla_labels = len/4;
+ if (nla_labels > max_labels) {
+ NL_SET_ERR_MSG(extack, "Too many labels");
+ return -EINVAL;
+ }
+
+ /* when label == NULL, caller wants number of labels */
+ if (!label)
+ goto out;
+
+ nla_label = nla_data(nla);
+ bos = true;
+ for (i = nla_labels - 1; i >= 0; i--, bos = false) {
+ struct mpls_entry_decoded dec;
+ dec = mpls_entry_decode(nla_label + i);
+
+ /* Ensure the bottom of stack flag is properly set
+ * and ttl and tc are both clear.
+ */
+ if (dec.ttl) {
+ NL_SET_ERR_MSG_ATTR(extack, nla,
+ "TTL in label must be 0");
+ return -EINVAL;
+ }
+
+ if (dec.tc) {
+ NL_SET_ERR_MSG_ATTR(extack, nla,
+ "Traffic class in label must be 0");
+ return -EINVAL;
+ }
+
+ if (dec.bos != bos) {
+ NL_SET_BAD_ATTR(extack, nla);
+ if (bos) {
+ NL_SET_ERR_MSG(extack,
+ "BOS bit must be set in first label");
+ } else {
+ NL_SET_ERR_MSG(extack,
+ "BOS bit can only be set in first label");
+ }
+ return -EINVAL;
+ }
+
+ switch (dec.label) {
+ case MPLS_LABEL_IMPLNULL:
+ /* RFC3032: This is a label that an LSR may
+ * assign and distribute, but which never
+ * actually appears in the encapsulation.
+ */
+ NL_SET_ERR_MSG_ATTR(extack, nla,
+ "Implicit NULL Label (3) can not be used in encapsulation");
+ return -EINVAL;
+ }
+
+ label[i] = dec.label;
+ }
+out:
+ *labels = nla_labels;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nla_get_labels);
+
+static int rtm_to_route_config(struct sk_buff *skb,
+ struct nlmsghdr *nlh,
+ struct mpls_route_config *cfg,
+ struct netlink_ext_ack *extack)
+{
+ struct rtmsg *rtm;
+ struct nlattr *tb[RTA_MAX+1];
+ int index;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy,
+ extack);
+ if (err < 0)
+ goto errout;
+
+ err = -EINVAL;
+ rtm = nlmsg_data(nlh);
+
+ if (rtm->rtm_family != AF_MPLS) {
+ NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg");
+ goto errout;
+ }
+ if (rtm->rtm_dst_len != 20) {
+ NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS");
+ goto errout;
+ }
+ if (rtm->rtm_src_len != 0) {
+ NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS");
+ goto errout;
+ }
+ if (rtm->rtm_tos != 0) {
+ NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS");
+ goto errout;
+ }
+ if (rtm->rtm_table != RT_TABLE_MAIN) {
+ NL_SET_ERR_MSG(extack,
+ "MPLS only supports the main route table");
+ goto errout;
+ }
+ /* Any value is acceptable for rtm_protocol */
+
+ /* As mpls uses destination specific addresses
+ * (or source specific address in the case of multicast)
+ * all addresses have universal scope.
+ */
+ if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid route scope - MPLS only supports UNIVERSE");
+ goto errout;
+ }
+ if (rtm->rtm_type != RTN_UNICAST) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid route type - MPLS only supports UNICAST");
+ goto errout;
+ }
+ if (rtm->rtm_flags != 0) {
+ NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS");
+ goto errout;
+ }
+
+ cfg->rc_label = LABEL_NOT_SPECIFIED;
+ cfg->rc_protocol = rtm->rtm_protocol;
+ cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC;
+ cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
+ cfg->rc_nlflags = nlh->nlmsg_flags;
+ cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid;
+ cfg->rc_nlinfo.nlh = nlh;
+ cfg->rc_nlinfo.nl_net = sock_net(skb->sk);
+
+ for (index = 0; index <= RTA_MAX; index++) {
+ struct nlattr *nla = tb[index];
+ if (!nla)
+ continue;
+
+ switch (index) {
+ case RTA_OIF:
+ cfg->rc_ifindex = nla_get_u32(nla);
+ break;
+ case RTA_NEWDST:
+ if (nla_get_labels(nla, MAX_NEW_LABELS,
+ &cfg->rc_output_labels,
+ cfg->rc_output_label, extack))
+ goto errout;
+ break;
+ case RTA_DST:
+ {
+ u8 label_count;
+ if (nla_get_labels(nla, 1, &label_count,
+ &cfg->rc_label, extack))
+ goto errout;
+
+ if (!mpls_label_ok(cfg->rc_nlinfo.nl_net,
+ &cfg->rc_label, extack))
+ goto errout;
+ break;
+ }
+ case RTA_VIA:
+ {
+ if (nla_get_via(nla, &cfg->rc_via_alen,
+ &cfg->rc_via_table, cfg->rc_via,
+ extack))
+ goto errout;
+ break;
+ }
+ case RTA_MULTIPATH:
+ {
+ cfg->rc_mp = nla_data(nla);
+ cfg->rc_mp_len = nla_len(nla);
+ break;
+ }
+ case RTA_TTL_PROPAGATE:
+ {
+ u8 ttl_propagate = nla_get_u8(nla);
+
+ if (ttl_propagate > 1) {
+ NL_SET_ERR_MSG_ATTR(extack, nla,
+ "RTA_TTL_PROPAGATE can only be 0 or 1");
+ goto errout;
+ }
+ cfg->rc_ttl_propagate = ttl_propagate ?
+ MPLS_TTL_PROP_ENABLED :
+ MPLS_TTL_PROP_DISABLED;
+ break;
+ }
+ default:
+ NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute");
+ /* Unsupported attribute */
+ goto errout;
+ }
+ }
+
+ err = 0;
+errout:
+ return err;
+}
+
+static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct mpls_route_config *cfg;
+ int err;
+
+ cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
+ if (!cfg)
+ return -ENOMEM;
+
+ err = rtm_to_route_config(skb, nlh, cfg, extack);
+ if (err < 0)
+ goto out;
+
+ err = mpls_route_del(cfg, extack);
+out:
+ kfree(cfg);
+
+ return err;
+}
+
+
+static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct mpls_route_config *cfg;
+ int err;
+
+ cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
+ if (!cfg)
+ return -ENOMEM;
+
+ err = rtm_to_route_config(skb, nlh, cfg, extack);
+ if (err < 0)
+ goto out;
+
+ err = mpls_route_add(cfg, extack);
+out:
+ kfree(cfg);
+
+ return err;
+}
+
+static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
+ u32 label, struct mpls_route *rt, int flags)
+{
+ struct net_device *dev;
+ struct nlmsghdr *nlh;
+ struct rtmsg *rtm;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);
+ if (nlh == NULL)
+ return -EMSGSIZE;
+
+ rtm = nlmsg_data(nlh);
+ rtm->rtm_family = AF_MPLS;
+ rtm->rtm_dst_len = 20;
+ rtm->rtm_src_len = 0;
+ rtm->rtm_tos = 0;
+ rtm->rtm_table = RT_TABLE_MAIN;
+ rtm->rtm_protocol = rt->rt_protocol;
+ rtm->rtm_scope = RT_SCOPE_UNIVERSE;
+ rtm->rtm_type = RTN_UNICAST;
+ rtm->rtm_flags = 0;
+
+ if (nla_put_labels(skb, RTA_DST, 1, &label))
+ goto nla_put_failure;
+
+ if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) {
+ bool ttl_propagate =
+ rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED;
+
+ if (nla_put_u8(skb, RTA_TTL_PROPAGATE,
+ ttl_propagate))
+ goto nla_put_failure;
+ }
+ if (rt->rt_nhn == 1) {
+ const struct mpls_nh *nh = rt->rt_nh;
+
+ if (nh->nh_labels &&
+ nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
+ nh->nh_label))
+ goto nla_put_failure;
+ if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
+ nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
+ nh->nh_via_alen))
+ goto nla_put_failure;
+ dev = rtnl_dereference(nh->nh_dev);
+ if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
+ goto nla_put_failure;
+ if (nh->nh_flags & RTNH_F_LINKDOWN)
+ rtm->rtm_flags |= RTNH_F_LINKDOWN;
+ if (nh->nh_flags & RTNH_F_DEAD)
+ rtm->rtm_flags |= RTNH_F_DEAD;
+ } else {
+ struct rtnexthop *rtnh;
+ struct nlattr *mp;
+ u8 linkdown = 0;
+ u8 dead = 0;
+
+ mp = nla_nest_start(skb, RTA_MULTIPATH);
+ if (!mp)
+ goto nla_put_failure;
+
+ for_nexthops(rt) {
+ dev = rtnl_dereference(nh->nh_dev);
+ if (!dev)
+ continue;
+
+ rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
+ if (!rtnh)
+ goto nla_put_failure;
+
+ rtnh->rtnh_ifindex = dev->ifindex;
+ if (nh->nh_flags & RTNH_F_LINKDOWN) {
+ rtnh->rtnh_flags |= RTNH_F_LINKDOWN;
+ linkdown++;
+ }
+ if (nh->nh_flags & RTNH_F_DEAD) {
+ rtnh->rtnh_flags |= RTNH_F_DEAD;
+ dead++;
+ }
+
+ if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST,
+ nh->nh_labels,
+ nh->nh_label))
+ goto nla_put_failure;
+ if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
+ nla_put_via(skb, nh->nh_via_table,
+ mpls_nh_via(rt, nh),
+ nh->nh_via_alen))
+ goto nla_put_failure;
+
+ /* length of rtnetlink header + attributes */
+ rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
+ } endfor_nexthops(rt);
+
+ if (linkdown == rt->rt_nhn)
+ rtm->rtm_flags |= RTNH_F_LINKDOWN;
+ if (dead == rt->rt_nhn)
+ rtm->rtm_flags |= RTNH_F_DEAD;
+
+ nla_nest_end(skb, mp);
+ }
+
+ nlmsg_end(skb, nlh);
+ return 0;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ struct mpls_route __rcu **platform_label;
+ size_t platform_labels;
+ unsigned int index;
+
+ ASSERT_RTNL();
+
+ index = cb->args[0];
+ if (index < MPLS_LABEL_FIRST_UNRESERVED)
+ index = MPLS_LABEL_FIRST_UNRESERVED;
+
+ platform_label = rtnl_dereference(net->mpls.platform_label);
+ platform_labels = net->mpls.platform_labels;
+ for (; index < platform_labels; index++) {
+ struct mpls_route *rt;
+ rt = rtnl_dereference(platform_label[index]);
+ if (!rt)
+ continue;
+
+ if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, RTM_NEWROUTE,
+ index, rt, NLM_F_MULTI) < 0)
+ break;
+ }
+ cb->args[0] = index;
+
+ return skb->len;
+}
+
+static inline size_t lfib_nlmsg_size(struct mpls_route *rt)
+{
+ size_t payload =
+ NLMSG_ALIGN(sizeof(struct rtmsg))
+ + nla_total_size(4) /* RTA_DST */
+ + nla_total_size(1); /* RTA_TTL_PROPAGATE */
+
+ if (rt->rt_nhn == 1) {
+ struct mpls_nh *nh = rt->rt_nh;
+
+ if (nh->nh_dev)
+ payload += nla_total_size(4); /* RTA_OIF */
+ if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */
+ payload += nla_total_size(2 + nh->nh_via_alen);
+ if (nh->nh_labels) /* RTA_NEWDST */
+ payload += nla_total_size(nh->nh_labels * 4);
+ } else {
+ /* each nexthop is packed in an attribute */
+ size_t nhsize = 0;
+
+ for_nexthops(rt) {
+ if (!rtnl_dereference(nh->nh_dev))
+ continue;
+ nhsize += nla_total_size(sizeof(struct rtnexthop));
+ /* RTA_VIA */
+ if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC)
+ nhsize += nla_total_size(2 + nh->nh_via_alen);
+ if (nh->nh_labels)
+ nhsize += nla_total_size(nh->nh_labels * 4);
+ } endfor_nexthops(rt);
+ /* nested attribute */
+ payload += nla_total_size(nhsize);
+ }
+
+ return payload;
+}
+
+static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
+ struct nlmsghdr *nlh, struct net *net, u32 portid,
+ unsigned int nlm_flags)
+{
+ struct sk_buff *skb;
+ u32 seq = nlh ? nlh->nlmsg_seq : 0;
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
+ if (skb == NULL)
+ goto errout;
+
+ err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL);
+
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err);
+}
+
+static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(in_skb->sk);
+ u32 portid = NETLINK_CB(in_skb).portid;
+ u32 in_label = LABEL_NOT_SPECIFIED;
+ struct nlattr *tb[RTA_MAX + 1];
+ u32 labels[MAX_NEW_LABELS];
+ struct mpls_shim_hdr *hdr;
+ unsigned int hdr_size = 0;
+ struct net_device *dev;
+ struct mpls_route *rt;
+ struct rtmsg *rtm, *r;
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ struct mpls_nh *nh;
+ u8 n_labels;
+ int err;
+
+ err = nlmsg_parse(in_nlh, sizeof(*rtm), tb, RTA_MAX,
+ rtm_mpls_policy, extack);
+ if (err < 0)
+ goto errout;
+
+ rtm = nlmsg_data(in_nlh);
+
+ if (tb[RTA_DST]) {
+ u8 label_count;
+
+ if (nla_get_labels(tb[RTA_DST], 1, &label_count,
+ &in_label, extack)) {
+ err = -EINVAL;
+ goto errout;
+ }
+
+ if (!mpls_label_ok(net, &in_label, extack)) {
+ err = -EINVAL;
+ goto errout;
+ }
+ }
+
+ rt = mpls_route_input_rcu(net, in_label);
+ if (!rt) {
+ err = -ENETUNREACH;
+ goto errout;
+ }
+
+ if (rtm->rtm_flags & RTM_F_FIB_MATCH) {
+ skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
+ if (!skb) {
+ err = -ENOBUFS;
+ goto errout;
+ }
+
+ err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq,
+ RTM_NEWROUTE, in_label, rt, 0);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in lfib_nlmsg_size */
+ WARN_ON(err == -EMSGSIZE);
+ goto errout_free;
+ }
+
+ return rtnl_unicast(skb, net, portid);
+ }
+
+ if (tb[RTA_NEWDST]) {
+ if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels,
+ labels, extack) != 0) {
+ err = -EINVAL;
+ goto errout;
+ }
+
+ hdr_size = n_labels * sizeof(struct mpls_shim_hdr);
+ }
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!skb) {
+ err = -ENOBUFS;
+ goto errout;
+ }
+
+ skb->protocol = htons(ETH_P_MPLS_UC);
+
+ if (hdr_size) {
+ bool bos;
+ int i;
+
+ if (skb_cow(skb, hdr_size)) {
+ err = -ENOBUFS;
+ goto errout_free;
+ }
+
+ skb_reserve(skb, hdr_size);
+ skb_push(skb, hdr_size);
+ skb_reset_network_header(skb);
+
+ /* Push new labels */
+ hdr = mpls_hdr(skb);
+ bos = true;
+ for (i = n_labels - 1; i >= 0; i--) {
+ hdr[i] = mpls_entry_encode(labels[i],
+ 1, 0, bos);
+ bos = false;
+ }
+ }
+
+ nh = mpls_select_multipath(rt, skb);
+ if (!nh) {
+ err = -ENETUNREACH;
+ goto errout_free;
+ }
+
+ if (hdr_size) {
+ skb_pull(skb, hdr_size);
+ skb_reset_network_header(skb);
+ }
+
+ nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq,
+ RTM_NEWROUTE, sizeof(*r), 0);
+ if (!nlh) {
+ err = -EMSGSIZE;
+ goto errout_free;
+ }
+
+ r = nlmsg_data(nlh);
+ r->rtm_family = AF_MPLS;
+ r->rtm_dst_len = 20;
+ r->rtm_src_len = 0;
+ r->rtm_table = RT_TABLE_MAIN;
+ r->rtm_type = RTN_UNICAST;
+ r->rtm_scope = RT_SCOPE_UNIVERSE;
+ r->rtm_protocol = rt->rt_protocol;
+ r->rtm_flags = 0;
+
+ if (nla_put_labels(skb, RTA_DST, 1, &in_label))
+ goto nla_put_failure;
+
+ if (nh->nh_labels &&
+ nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
+ nh->nh_label))
+ goto nla_put_failure;
+
+ if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
+ nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
+ nh->nh_via_alen))
+ goto nla_put_failure;
+ dev = rtnl_dereference(nh->nh_dev);
+ if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
+ goto nla_put_failure;
+
+ nlmsg_end(skb, nlh);
+
+ err = rtnl_unicast(skb, net, portid);
+errout:
+ return err;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ err = -EMSGSIZE;
+errout_free:
+ kfree_skb(skb);
+ return err;
+}
+
+static int resize_platform_label_table(struct net *net, size_t limit)
+{
+ size_t size = sizeof(struct mpls_route *) * limit;
+ size_t old_limit;
+ size_t cp_size;
+ struct mpls_route __rcu **labels = NULL, **old;
+ struct mpls_route *rt0 = NULL, *rt2 = NULL;
+ unsigned index;
+
+ if (size) {
+ labels = kvzalloc(size, GFP_KERNEL);
+ if (!labels)
+ goto nolabels;
+ }
+
+ /* In case the predefined labels need to be populated */
+ if (limit > MPLS_LABEL_IPV4NULL) {
+ struct net_device *lo = net->loopback_dev;
+ rt0 = mpls_rt_alloc(1, lo->addr_len, 0);
+ if (IS_ERR(rt0))
+ goto nort0;
+ RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo);
+ rt0->rt_protocol = RTPROT_KERNEL;
+ rt0->rt_payload_type = MPT_IPV4;
+ rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
+ rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
+ rt0->rt_nh->nh_via_alen = lo->addr_len;
+ memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr,
+ lo->addr_len);
+ }
+ if (limit > MPLS_LABEL_IPV6NULL) {
+ struct net_device *lo = net->loopback_dev;
+ rt2 = mpls_rt_alloc(1, lo->addr_len, 0);
+ if (IS_ERR(rt2))
+ goto nort2;
+ RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo);
+ rt2->rt_protocol = RTPROT_KERNEL;
+ rt2->rt_payload_type = MPT_IPV6;
+ rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT;
+ rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE;
+ rt2->rt_nh->nh_via_alen = lo->addr_len;
+ memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr,
+ lo->addr_len);
+ }
+
+ rtnl_lock();
+ /* Remember the original table */
+ old = rtnl_dereference(net->mpls.platform_label);
+ old_limit = net->mpls.platform_labels;
+
+ /* Free any labels beyond the new table */
+ for (index = limit; index < old_limit; index++)
+ mpls_route_update(net, index, NULL, NULL);
+
+ /* Copy over the old labels */
+ cp_size = size;
+ if (old_limit < limit)
+ cp_size = old_limit * sizeof(struct mpls_route *);
+
+ memcpy(labels, old, cp_size);
+
+ /* If needed set the predefined labels */
+ if ((old_limit <= MPLS_LABEL_IPV6NULL) &&
+ (limit > MPLS_LABEL_IPV6NULL)) {
+ RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2);
+ rt2 = NULL;
+ }
+
+ if ((old_limit <= MPLS_LABEL_IPV4NULL) &&
+ (limit > MPLS_LABEL_IPV4NULL)) {
+ RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0);
+ rt0 = NULL;
+ }
+
+ /* Update the global pointers */
+ net->mpls.platform_labels = limit;
+ rcu_assign_pointer(net->mpls.platform_label, labels);
+
+ rtnl_unlock();
+
+ mpls_rt_free(rt2);
+ mpls_rt_free(rt0);
+
+ if (old) {
+ synchronize_rcu();
+ kvfree(old);
+ }
+ return 0;
+
+nort2:
+ mpls_rt_free(rt0);
+nort0:
+ kvfree(labels);
+nolabels:
+ return -ENOMEM;
+}
+
+static int mpls_platform_labels(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct net *net = table->data;
+ int platform_labels = net->mpls.platform_labels;
+ int ret;
+ struct ctl_table tmp = {
+ .procname = table->procname,
+ .data = &platform_labels,
+ .maxlen = sizeof(int),
+ .mode = table->mode,
+ .extra1 = &zero,
+ .extra2 = &label_limit,
+ };
+
+ ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
+
+ if (write && ret == 0)
+ ret = resize_platform_label_table(net, platform_labels);
+
+ return ret;
+}
+
+#define MPLS_NS_SYSCTL_OFFSET(field) \
+ (&((struct net *)0)->field)
+
+static const struct ctl_table mpls_table[] = {
+ {
+ .procname = "platform_labels",
+ .data = NULL,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = mpls_platform_labels,
+ },
+ {
+ .procname = "ip_ttl_propagate",
+ .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate),
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &one,
+ },
+ {
+ .procname = "default_ttl",
+ .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl),
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &one,
+ .extra2 = &ttl_max,
+ },
+ { }
+};
+
+static int mpls_net_init(struct net *net)
+{
+ struct ctl_table *table;
+ int i;
+
+ net->mpls.platform_labels = 0;
+ net->mpls.platform_label = NULL;
+ net->mpls.ip_ttl_propagate = 1;
+ net->mpls.default_ttl = 255;
+
+ table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL);
+ if (table == NULL)
+ return -ENOMEM;
+
+ /* Table data contains only offsets relative to the base of
+ * the mdev at this point, so make them absolute.
+ */
+ for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++)
+ table[i].data = (char *)net + (uintptr_t)table[i].data;
+
+ net->mpls.ctl = register_net_sysctl(net, "net/mpls", table);
+ if (net->mpls.ctl == NULL) {
+ kfree(table);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void mpls_net_exit(struct net *net)
+{
+ struct mpls_route __rcu **platform_label;
+ size_t platform_labels;
+ struct ctl_table *table;
+ unsigned int index;
+
+ table = net->mpls.ctl->ctl_table_arg;
+ unregister_net_sysctl_table(net->mpls.ctl);
+ kfree(table);
+
+ /* An rcu grace period has passed since there was a device in
+ * the network namespace (and thus the last in flight packet)
+ * left this network namespace. This is because
+ * unregister_netdevice_many and netdev_run_todo has completed
+ * for each network device that was in this network namespace.
+ *
+ * As such no additional rcu synchronization is necessary when
+ * freeing the platform_label table.
+ */
+ rtnl_lock();
+ platform_label = rtnl_dereference(net->mpls.platform_label);
+ platform_labels = net->mpls.platform_labels;
+ for (index = 0; index < platform_labels; index++) {
+ struct mpls_route *rt = rtnl_dereference(platform_label[index]);
+ RCU_INIT_POINTER(platform_label[index], NULL);
+ mpls_notify_route(net, index, rt, NULL, NULL);
+ mpls_rt_free(rt);
+ }
+ rtnl_unlock();
+
+ kvfree(platform_label);
+}
+
+static struct pernet_operations mpls_net_ops = {
+ .init = mpls_net_init,
+ .exit = mpls_net_exit,
+};
+
+static struct rtnl_af_ops mpls_af_ops __read_mostly = {
+ .family = AF_MPLS,
+ .fill_stats_af = mpls_fill_stats_af,
+ .get_stats_af_size = mpls_get_stats_af_size,
+};
+
+static int __init mpls_init(void)
+{
+ int err;
+
+ BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4);
+
+ err = register_pernet_subsys(&mpls_net_ops);
+ if (err)
+ goto out;
+
+ err = register_netdevice_notifier(&mpls_dev_notifier);
+ if (err)
+ goto out_unregister_pernet;
+
+ dev_add_pack(&mpls_packet_type);
+
+ rtnl_af_register(&mpls_af_ops);
+
+ rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE,
+ mpls_rtm_newroute, NULL, 0);
+ rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE,
+ mpls_rtm_delroute, NULL, 0);
+ rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE,
+ mpls_getroute, mpls_dump_routes, 0);
+ rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF,
+ mpls_netconf_get_devconf,
+ mpls_netconf_dump_devconf, 0);
+ err = ipgre_tunnel_encap_add_mpls_ops();
+ if (err)
+ pr_err("Can't add mpls over gre tunnel ops\n");
+
+ err = 0;
+out:
+ return err;
+
+out_unregister_pernet:
+ unregister_pernet_subsys(&mpls_net_ops);
+ goto out;
+}
+module_init(mpls_init);
+
+static void __exit mpls_exit(void)
+{
+ rtnl_unregister_all(PF_MPLS);
+ rtnl_af_unregister(&mpls_af_ops);
+ dev_remove_pack(&mpls_packet_type);
+ unregister_netdevice_notifier(&mpls_dev_notifier);
+ unregister_pernet_subsys(&mpls_net_ops);
+ ipgre_tunnel_encap_del_mpls_ops();
+}
+module_exit(mpls_exit);
+
+MODULE_DESCRIPTION("MultiProtocol Label Switching");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_NETPROTO(PF_MPLS);