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- // SPDX-License-Identifier: GPL-2.0-only
- #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/ipv6_stubs.h>
- #include <net/rtnh.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 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;
- if (!ipv6_stub)
- return ERR_PTR(-EAFNOSUPPORT);
- memset(&fl6, 0, sizeof(fl6));
- memcpy(&fl6.daddr, addr, sizeof(struct in6_addr));
- dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL);
- if (IS_ERR(dst))
- return ERR_CAST(dst);
- 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_valid_get_req(struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- struct nlattr **tb,
- struct netlink_ext_ack *extack)
- {
- int i, err;
- if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
- NL_SET_ERR_MSG_MOD(extack,
- "Invalid header for netconf get request");
- return -EINVAL;
- }
- if (!netlink_strict_get_check(skb))
- return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
- tb, NETCONFA_MAX,
- devconf_mpls_policy, extack);
- err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
- tb, NETCONFA_MAX,
- devconf_mpls_policy, extack);
- if (err)
- return err;
- for (i = 0; i <= NETCONFA_MAX; i++) {
- if (!tb[i])
- continue;
- switch (i) {
- case NETCONFA_IFINDEX:
- break;
- default:
- NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
- return -EINVAL;
- }
- }
- return 0;
- }
- 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 net_device *dev;
- struct mpls_dev *mdev;
- struct sk_buff *skb;
- int ifindex;
- int err;
- err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack);
- 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)
- {
- const struct nlmsghdr *nlh = cb->nlh;
- 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;
- if (cb->strict_check) {
- struct netlink_ext_ack *extack = cb->extack;
- struct netconfmsg *ncm;
- if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
- NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
- return -EINVAL;
- }
- if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
- NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
- return -EINVAL;
- }
- }
- 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,
- 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 *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 int mpls_ifdown(struct net_device *dev, int event)
- {
- struct mpls_route __rcu **platform_label;
- struct net *net = dev_net(dev);
- 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]);
- bool nh_del = false;
- u8 alive = 0;
- if (!rt)
- continue;
- if (event == NETDEV_UNREGISTER) {
- u8 deleted = 0;
- for_nexthops(rt) {
- struct net_device *nh_dev =
- rtnl_dereference(nh->nh_dev);
- if (!nh_dev || nh_dev == dev)
- deleted++;
- if (nh_dev == dev)
- nh_del = true;
- } endfor_nexthops(rt);
- /* if there are no more nexthops, delete the route */
- if (deleted == rt->rt_nhn) {
- mpls_route_update(net, index, NULL, NULL);
- continue;
- }
- if (nh_del) {
- size_t size = sizeof(*rt) + rt->rt_nhn *
- rt->rt_nh_size;
- struct mpls_route *orig = rt;
- rt = kmalloc(size, GFP_KERNEL);
- if (!rt)
- return -ENOMEM;
- memcpy(rt, orig, size);
- }
- }
- 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;
- fallthrough;
- 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++;
- } endfor_nexthops(rt);
- WRITE_ONCE(rt->rt_nhn_alive, alive);
- if (nh_del)
- mpls_route_update(net, index, rt, NULL);
- }
- return 0;
- }
- 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) {
- 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) {
- int err;
- case NETDEV_DOWN:
- err = mpls_ifdown(dev, event);
- if (err)
- return notifier_from_errno(err);
- 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 {
- err = mpls_ifdown(dev, event);
- if (err)
- return notifier_from_errno(err);
- }
- break;
- case NETDEV_UNREGISTER:
- err = mpls_ifdown(dev, event);
- if (err)
- return notifier_from_errno(err);
- 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) {
- 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_deprecated(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_GATEWAY:
- NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute");
- goto errout;
- 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_noflag(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;
- }
- #if IS_ENABLED(CONFIG_INET)
- static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
- struct fib_dump_filter *filter,
- struct netlink_callback *cb)
- {
- return ip_valid_fib_dump_req(net, nlh, filter, cb);
- }
- #else
- static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
- struct fib_dump_filter *filter,
- struct netlink_callback *cb)
- {
- struct netlink_ext_ack *extack = cb->extack;
- struct nlattr *tb[RTA_MAX + 1];
- struct rtmsg *rtm;
- int err, i;
- if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
- NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request");
- return -EINVAL;
- }
- rtm = nlmsg_data(nlh);
- if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos ||
- rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type ||
- rtm->rtm_flags) {
- NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request");
- return -EINVAL;
- }
- if (rtm->rtm_protocol) {
- filter->protocol = rtm->rtm_protocol;
- filter->filter_set = 1;
- cb->answer_flags = NLM_F_DUMP_FILTERED;
- }
- err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
- rtm_mpls_policy, extack);
- if (err < 0)
- return err;
- for (i = 0; i <= RTA_MAX; ++i) {
- int ifindex;
- if (i == RTA_OIF) {
- ifindex = nla_get_u32(tb[i]);
- filter->dev = __dev_get_by_index(net, ifindex);
- if (!filter->dev)
- return -ENODEV;
- filter->filter_set = 1;
- } else if (tb[i]) {
- NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
- return -EINVAL;
- }
- }
- return 0;
- }
- #endif
- static bool mpls_rt_uses_dev(struct mpls_route *rt,
- const struct net_device *dev)
- {
- struct net_device *nh_dev;
- if (rt->rt_nhn == 1) {
- struct mpls_nh *nh = rt->rt_nh;
- nh_dev = rtnl_dereference(nh->nh_dev);
- if (dev == nh_dev)
- return true;
- } else {
- for_nexthops(rt) {
- nh_dev = rtnl_dereference(nh->nh_dev);
- if (nh_dev == dev)
- return true;
- } endfor_nexthops(rt);
- }
- return false;
- }
- static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb)
- {
- const struct nlmsghdr *nlh = cb->nlh;
- struct net *net = sock_net(skb->sk);
- struct mpls_route __rcu **platform_label;
- struct fib_dump_filter filter = {};
- unsigned int flags = NLM_F_MULTI;
- size_t platform_labels;
- unsigned int index;
- ASSERT_RTNL();
- if (cb->strict_check) {
- int err;
- err = mpls_valid_fib_dump_req(net, nlh, &filter, cb);
- if (err < 0)
- return err;
- /* for MPLS, there is only 1 table with fixed type and flags.
- * If either are set in the filter then return nothing.
- */
- if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) ||
- (filter.rt_type && filter.rt_type != RTN_UNICAST) ||
- filter.flags)
- return skb->len;
- }
- 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;
- if (filter.filter_set)
- flags |= NLM_F_DUMP_FILTERED;
- for (; index < platform_labels; index++) {
- struct mpls_route *rt;
- rt = rtnl_dereference(platform_label[index]);
- if (!rt)
- continue;
- if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) ||
- (filter.protocol && rt->rt_protocol != filter.protocol))
- continue;
- if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid,
- cb->nlh->nlmsg_seq, RTM_NEWROUTE,
- index, rt, flags) < 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_valid_getroute_req(struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- struct nlattr **tb,
- struct netlink_ext_ack *extack)
- {
- struct rtmsg *rtm;
- int i, err;
- if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
- NL_SET_ERR_MSG_MOD(extack,
- "Invalid header for get route request");
- return -EINVAL;
- }
- if (!netlink_strict_get_check(skb))
- return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
- rtm_mpls_policy, extack);
- rtm = nlmsg_data(nlh);
- if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) ||
- rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table ||
- rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) {
- NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
- return -EINVAL;
- }
- if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
- NL_SET_ERR_MSG_MOD(extack,
- "Invalid flags for get route request");
- return -EINVAL;
- }
- err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
- rtm_mpls_policy, extack);
- if (err)
- return err;
- if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) {
- NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS");
- return -EINVAL;
- }
- for (i = 0; i <= RTA_MAX; i++) {
- if (!tb[i])
- continue;
- switch (i) {
- case RTA_DST:
- case RTA_NEWDST:
- break;
- default:
- NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
- return -EINVAL;
- }
- }
- return 0;
- }
- 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 = mpls_valid_getroute_req(in_skb, in_nlh, tb, 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 *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 = SYSCTL_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 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- {
- .procname = "default_ttl",
- .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl),
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_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);
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