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-rw-r--r--net/openvswitch/datapath.c2661
1 files changed, 2661 insertions, 0 deletions
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
new file mode 100644
index 000000000..b625ab5e9
--- /dev/null
+++ b/net/openvswitch/datapath.c
@@ -0,0 +1,2661 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2007-2014 Nicira, Inc.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/if_arp.h>
+#include <linux/if_vlan.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/jhash.h>
+#include <linux/delay.h>
+#include <linux/time.h>
+#include <linux/etherdevice.h>
+#include <linux/genetlink.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/mutex.h>
+#include <linux/percpu.h>
+#include <linux/rcupdate.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/ethtool.h>
+#include <linux/wait.h>
+#include <asm/div64.h>
+#include <linux/highmem.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/inetdevice.h>
+#include <linux/list.h>
+#include <linux/openvswitch.h>
+#include <linux/rculist.h>
+#include <linux/dmi.h>
+#include <net/genetlink.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+
+#include "datapath.h"
+#include "flow.h"
+#include "flow_table.h"
+#include "flow_netlink.h"
+#include "meter.h"
+#include "vport-internal_dev.h"
+#include "vport-netdev.h"
+
+unsigned int ovs_net_id __read_mostly;
+
+static struct genl_family dp_packet_genl_family;
+static struct genl_family dp_flow_genl_family;
+static struct genl_family dp_datapath_genl_family;
+
+static const struct nla_policy flow_policy[];
+
+static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
+ .name = OVS_FLOW_MCGROUP,
+};
+
+static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
+ .name = OVS_DATAPATH_MCGROUP,
+};
+
+static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
+ .name = OVS_VPORT_MCGROUP,
+};
+
+/* Check if need to build a reply message.
+ * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
+static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
+ unsigned int group)
+{
+ return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
+ genl_has_listeners(family, genl_info_net(info), group);
+}
+
+static void ovs_notify(struct genl_family *family,
+ struct sk_buff *skb, struct genl_info *info)
+{
+ genl_notify(family, skb, info, 0, GFP_KERNEL);
+}
+
+/**
+ * DOC: Locking:
+ *
+ * All writes e.g. Writes to device state (add/remove datapath, port, set
+ * operations on vports, etc.), Writes to other state (flow table
+ * modifications, set miscellaneous datapath parameters, etc.) are protected
+ * by ovs_lock.
+ *
+ * Reads are protected by RCU.
+ *
+ * There are a few special cases (mostly stats) that have their own
+ * synchronization but they nest under all of above and don't interact with
+ * each other.
+ *
+ * The RTNL lock nests inside ovs_mutex.
+ */
+
+static DEFINE_MUTEX(ovs_mutex);
+
+void ovs_lock(void)
+{
+ mutex_lock(&ovs_mutex);
+}
+
+void ovs_unlock(void)
+{
+ mutex_unlock(&ovs_mutex);
+}
+
+#ifdef CONFIG_LOCKDEP
+int lockdep_ovsl_is_held(void)
+{
+ if (debug_locks)
+ return lockdep_is_held(&ovs_mutex);
+ else
+ return 1;
+}
+#endif
+
+static struct vport *new_vport(const struct vport_parms *);
+static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
+ const struct sw_flow_key *,
+ const struct dp_upcall_info *,
+ uint32_t cutlen);
+static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
+ const struct sw_flow_key *,
+ const struct dp_upcall_info *,
+ uint32_t cutlen);
+
+static void ovs_dp_masks_rebalance(struct work_struct *work);
+
+/* Must be called with rcu_read_lock or ovs_mutex. */
+const char *ovs_dp_name(const struct datapath *dp)
+{
+ struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
+ return ovs_vport_name(vport);
+}
+
+static int get_dpifindex(const struct datapath *dp)
+{
+ struct vport *local;
+ int ifindex;
+
+ rcu_read_lock();
+
+ local = ovs_vport_rcu(dp, OVSP_LOCAL);
+ if (local)
+ ifindex = local->dev->ifindex;
+ else
+ ifindex = 0;
+
+ rcu_read_unlock();
+
+ return ifindex;
+}
+
+static void destroy_dp_rcu(struct rcu_head *rcu)
+{
+ struct datapath *dp = container_of(rcu, struct datapath, rcu);
+
+ ovs_flow_tbl_destroy(&dp->table);
+ free_percpu(dp->stats_percpu);
+ kfree(dp->ports);
+ ovs_meters_exit(dp);
+ kfree(dp);
+}
+
+static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
+ u16 port_no)
+{
+ return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
+{
+ struct vport *vport;
+ struct hlist_head *head;
+
+ head = vport_hash_bucket(dp, port_no);
+ hlist_for_each_entry_rcu(vport, head, dp_hash_node,
+ lockdep_ovsl_is_held()) {
+ if (vport->port_no == port_no)
+ return vport;
+ }
+ return NULL;
+}
+
+/* Called with ovs_mutex. */
+static struct vport *new_vport(const struct vport_parms *parms)
+{
+ struct vport *vport;
+
+ vport = ovs_vport_add(parms);
+ if (!IS_ERR(vport)) {
+ struct datapath *dp = parms->dp;
+ struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
+
+ hlist_add_head_rcu(&vport->dp_hash_node, head);
+ }
+ return vport;
+}
+
+void ovs_dp_detach_port(struct vport *p)
+{
+ ASSERT_OVSL();
+
+ /* First drop references to device. */
+ hlist_del_rcu(&p->dp_hash_node);
+
+ /* Then destroy it. */
+ ovs_vport_del(p);
+}
+
+/* Must be called with rcu_read_lock. */
+void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
+{
+ const struct vport *p = OVS_CB(skb)->input_vport;
+ struct datapath *dp = p->dp;
+ struct sw_flow *flow;
+ struct sw_flow_actions *sf_acts;
+ struct dp_stats_percpu *stats;
+ u64 *stats_counter;
+ u32 n_mask_hit;
+ u32 n_cache_hit;
+ int error;
+
+ stats = this_cpu_ptr(dp->stats_percpu);
+
+ /* Look up flow. */
+ flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
+ &n_mask_hit, &n_cache_hit);
+ if (unlikely(!flow)) {
+ struct dp_upcall_info upcall;
+
+ memset(&upcall, 0, sizeof(upcall));
+ upcall.cmd = OVS_PACKET_CMD_MISS;
+ upcall.portid = ovs_vport_find_upcall_portid(p, skb);
+ upcall.mru = OVS_CB(skb)->mru;
+ error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
+ switch (error) {
+ case 0:
+ case -EAGAIN:
+ case -ERESTARTSYS:
+ case -EINTR:
+ consume_skb(skb);
+ break;
+ default:
+ kfree_skb(skb);
+ break;
+ }
+ stats_counter = &stats->n_missed;
+ goto out;
+ }
+
+ ovs_flow_stats_update(flow, key->tp.flags, skb);
+ sf_acts = rcu_dereference(flow->sf_acts);
+ error = ovs_execute_actions(dp, skb, sf_acts, key);
+ if (unlikely(error))
+ net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
+ ovs_dp_name(dp), error);
+
+ stats_counter = &stats->n_hit;
+
+out:
+ /* Update datapath statistics. */
+ u64_stats_update_begin(&stats->syncp);
+ (*stats_counter)++;
+ stats->n_mask_hit += n_mask_hit;
+ stats->n_cache_hit += n_cache_hit;
+ u64_stats_update_end(&stats->syncp);
+}
+
+int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
+ const struct sw_flow_key *key,
+ const struct dp_upcall_info *upcall_info,
+ uint32_t cutlen)
+{
+ struct dp_stats_percpu *stats;
+ int err;
+
+ if (upcall_info->portid == 0) {
+ err = -ENOTCONN;
+ goto err;
+ }
+
+ if (!skb_is_gso(skb))
+ err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
+ else
+ err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
+ if (err)
+ goto err;
+
+ return 0;
+
+err:
+ stats = this_cpu_ptr(dp->stats_percpu);
+
+ u64_stats_update_begin(&stats->syncp);
+ stats->n_lost++;
+ u64_stats_update_end(&stats->syncp);
+
+ return err;
+}
+
+static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
+ const struct sw_flow_key *key,
+ const struct dp_upcall_info *upcall_info,
+ uint32_t cutlen)
+{
+ unsigned int gso_type = skb_shinfo(skb)->gso_type;
+ struct sw_flow_key later_key;
+ struct sk_buff *segs, *nskb;
+ int err;
+
+ BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
+ segs = __skb_gso_segment(skb, NETIF_F_SG, false);
+ if (IS_ERR(segs))
+ return PTR_ERR(segs);
+ if (segs == NULL)
+ return -EINVAL;
+
+ if (gso_type & SKB_GSO_UDP) {
+ /* The initial flow key extracted by ovs_flow_key_extract()
+ * in this case is for a first fragment, so we need to
+ * properly mark later fragments.
+ */
+ later_key = *key;
+ later_key.ip.frag = OVS_FRAG_TYPE_LATER;
+ }
+
+ /* Queue all of the segments. */
+ skb_list_walk_safe(segs, skb, nskb) {
+ if (gso_type & SKB_GSO_UDP && skb != segs)
+ key = &later_key;
+
+ err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
+ if (err)
+ break;
+
+ }
+
+ /* Free all of the segments. */
+ skb_list_walk_safe(segs, skb, nskb) {
+ if (err)
+ kfree_skb(skb);
+ else
+ consume_skb(skb);
+ }
+ return err;
+}
+
+static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
+ unsigned int hdrlen, int actions_attrlen)
+{
+ size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
+ + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
+ + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
+ + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
+ + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
+
+ /* OVS_PACKET_ATTR_USERDATA */
+ if (upcall_info->userdata)
+ size += NLA_ALIGN(upcall_info->userdata->nla_len);
+
+ /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
+ if (upcall_info->egress_tun_info)
+ size += nla_total_size(ovs_tun_key_attr_size());
+
+ /* OVS_PACKET_ATTR_ACTIONS */
+ if (upcall_info->actions_len)
+ size += nla_total_size(actions_attrlen);
+
+ /* OVS_PACKET_ATTR_MRU */
+ if (upcall_info->mru)
+ size += nla_total_size(sizeof(upcall_info->mru));
+
+ return size;
+}
+
+static void pad_packet(struct datapath *dp, struct sk_buff *skb)
+{
+ if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
+ size_t plen = NLA_ALIGN(skb->len) - skb->len;
+
+ if (plen > 0)
+ skb_put_zero(skb, plen);
+ }
+}
+
+static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
+ const struct sw_flow_key *key,
+ const struct dp_upcall_info *upcall_info,
+ uint32_t cutlen)
+{
+ struct ovs_header *upcall;
+ struct sk_buff *nskb = NULL;
+ struct sk_buff *user_skb = NULL; /* to be queued to userspace */
+ struct nlattr *nla;
+ size_t len;
+ unsigned int hlen;
+ int err, dp_ifindex;
+ u64 hash;
+
+ dp_ifindex = get_dpifindex(dp);
+ if (!dp_ifindex)
+ return -ENODEV;
+
+ if (skb_vlan_tag_present(skb)) {
+ nskb = skb_clone(skb, GFP_ATOMIC);
+ if (!nskb)
+ return -ENOMEM;
+
+ nskb = __vlan_hwaccel_push_inside(nskb);
+ if (!nskb)
+ return -ENOMEM;
+
+ skb = nskb;
+ }
+
+ if (nla_attr_size(skb->len) > USHRT_MAX) {
+ err = -EFBIG;
+ goto out;
+ }
+
+ /* Complete checksum if needed */
+ if (skb->ip_summed == CHECKSUM_PARTIAL &&
+ (err = skb_csum_hwoffload_help(skb, 0)))
+ goto out;
+
+ /* Older versions of OVS user space enforce alignment of the last
+ * Netlink attribute to NLA_ALIGNTO which would require extensive
+ * padding logic. Only perform zerocopy if padding is not required.
+ */
+ if (dp->user_features & OVS_DP_F_UNALIGNED)
+ hlen = skb_zerocopy_headlen(skb);
+ else
+ hlen = skb->len;
+
+ len = upcall_msg_size(upcall_info, hlen - cutlen,
+ OVS_CB(skb)->acts_origlen);
+ user_skb = genlmsg_new(len, GFP_ATOMIC);
+ if (!user_skb) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
+ 0, upcall_info->cmd);
+ if (!upcall) {
+ err = -EINVAL;
+ goto out;
+ }
+ upcall->dp_ifindex = dp_ifindex;
+
+ err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
+ if (err)
+ goto out;
+
+ if (upcall_info->userdata)
+ __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
+ nla_len(upcall_info->userdata),
+ nla_data(upcall_info->userdata));
+
+ if (upcall_info->egress_tun_info) {
+ nla = nla_nest_start_noflag(user_skb,
+ OVS_PACKET_ATTR_EGRESS_TUN_KEY);
+ if (!nla) {
+ err = -EMSGSIZE;
+ goto out;
+ }
+ err = ovs_nla_put_tunnel_info(user_skb,
+ upcall_info->egress_tun_info);
+ if (err)
+ goto out;
+
+ nla_nest_end(user_skb, nla);
+ }
+
+ if (upcall_info->actions_len) {
+ nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
+ if (!nla) {
+ err = -EMSGSIZE;
+ goto out;
+ }
+ err = ovs_nla_put_actions(upcall_info->actions,
+ upcall_info->actions_len,
+ user_skb);
+ if (!err)
+ nla_nest_end(user_skb, nla);
+ else
+ nla_nest_cancel(user_skb, nla);
+ }
+
+ /* Add OVS_PACKET_ATTR_MRU */
+ if (upcall_info->mru &&
+ nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
+ err = -ENOBUFS;
+ goto out;
+ }
+
+ /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
+ if (cutlen > 0 &&
+ nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
+ err = -ENOBUFS;
+ goto out;
+ }
+
+ /* Add OVS_PACKET_ATTR_HASH */
+ hash = skb_get_hash_raw(skb);
+ if (skb->sw_hash)
+ hash |= OVS_PACKET_HASH_SW_BIT;
+
+ if (skb->l4_hash)
+ hash |= OVS_PACKET_HASH_L4_BIT;
+
+ if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
+ err = -ENOBUFS;
+ goto out;
+ }
+
+ /* Only reserve room for attribute header, packet data is added
+ * in skb_zerocopy() */
+ if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
+ err = -ENOBUFS;
+ goto out;
+ }
+ nla->nla_len = nla_attr_size(skb->len - cutlen);
+
+ err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
+ if (err)
+ goto out;
+
+ /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
+ pad_packet(dp, user_skb);
+
+ ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
+
+ err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
+ user_skb = NULL;
+out:
+ if (err)
+ skb_tx_error(skb);
+ consume_skb(user_skb);
+ consume_skb(nskb);
+
+ return err;
+}
+
+static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
+{
+ struct ovs_header *ovs_header = info->userhdr;
+ struct net *net = sock_net(skb->sk);
+ struct nlattr **a = info->attrs;
+ struct sw_flow_actions *acts;
+ struct sk_buff *packet;
+ struct sw_flow *flow;
+ struct sw_flow_actions *sf_acts;
+ struct datapath *dp;
+ struct vport *input_vport;
+ u16 mru = 0;
+ u64 hash;
+ int len;
+ int err;
+ bool log = !a[OVS_PACKET_ATTR_PROBE];
+
+ err = -EINVAL;
+ if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
+ !a[OVS_PACKET_ATTR_ACTIONS])
+ goto err;
+
+ len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
+ packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
+ err = -ENOMEM;
+ if (!packet)
+ goto err;
+ skb_reserve(packet, NET_IP_ALIGN);
+
+ nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
+
+ /* Set packet's mru */
+ if (a[OVS_PACKET_ATTR_MRU]) {
+ mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
+ packet->ignore_df = 1;
+ }
+ OVS_CB(packet)->mru = mru;
+
+ if (a[OVS_PACKET_ATTR_HASH]) {
+ hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
+
+ __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
+ !!(hash & OVS_PACKET_HASH_SW_BIT),
+ !!(hash & OVS_PACKET_HASH_L4_BIT));
+ }
+
+ /* Build an sw_flow for sending this packet. */
+ flow = ovs_flow_alloc();
+ err = PTR_ERR(flow);
+ if (IS_ERR(flow))
+ goto err_kfree_skb;
+
+ err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
+ packet, &flow->key, log);
+ if (err)
+ goto err_flow_free;
+
+ err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
+ &flow->key, &acts, log);
+ if (err)
+ goto err_flow_free;
+
+ rcu_assign_pointer(flow->sf_acts, acts);
+ packet->priority = flow->key.phy.priority;
+ packet->mark = flow->key.phy.skb_mark;
+
+ rcu_read_lock();
+ dp = get_dp_rcu(net, ovs_header->dp_ifindex);
+ err = -ENODEV;
+ if (!dp)
+ goto err_unlock;
+
+ input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
+ if (!input_vport)
+ input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
+
+ if (!input_vport)
+ goto err_unlock;
+
+ packet->dev = input_vport->dev;
+ OVS_CB(packet)->input_vport = input_vport;
+ sf_acts = rcu_dereference(flow->sf_acts);
+
+ local_bh_disable();
+ err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
+ local_bh_enable();
+ rcu_read_unlock();
+
+ ovs_flow_free(flow, false);
+ return err;
+
+err_unlock:
+ rcu_read_unlock();
+err_flow_free:
+ ovs_flow_free(flow, false);
+err_kfree_skb:
+ kfree_skb(packet);
+err:
+ return err;
+}
+
+static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
+ [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
+ [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
+ [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
+ [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
+ [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
+ [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
+};
+
+static const struct genl_small_ops dp_packet_genl_ops[] = {
+ { .cmd = OVS_PACKET_CMD_EXECUTE,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+ .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .doit = ovs_packet_cmd_execute
+ }
+};
+
+static struct genl_family dp_packet_genl_family __ro_after_init = {
+ .hdrsize = sizeof(struct ovs_header),
+ .name = OVS_PACKET_FAMILY,
+ .version = OVS_PACKET_VERSION,
+ .maxattr = OVS_PACKET_ATTR_MAX,
+ .policy = packet_policy,
+ .netnsok = true,
+ .parallel_ops = true,
+ .small_ops = dp_packet_genl_ops,
+ .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
+ .module = THIS_MODULE,
+};
+
+static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
+ struct ovs_dp_megaflow_stats *mega_stats)
+{
+ int i;
+
+ memset(mega_stats, 0, sizeof(*mega_stats));
+
+ stats->n_flows = ovs_flow_tbl_count(&dp->table);
+ mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
+
+ stats->n_hit = stats->n_missed = stats->n_lost = 0;
+
+ for_each_possible_cpu(i) {
+ const struct dp_stats_percpu *percpu_stats;
+ struct dp_stats_percpu local_stats;
+ unsigned int start;
+
+ percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
+
+ do {
+ start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
+ local_stats = *percpu_stats;
+ } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
+
+ stats->n_hit += local_stats.n_hit;
+ stats->n_missed += local_stats.n_missed;
+ stats->n_lost += local_stats.n_lost;
+ mega_stats->n_mask_hit += local_stats.n_mask_hit;
+ mega_stats->n_cache_hit += local_stats.n_cache_hit;
+ }
+}
+
+static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
+{
+ return ovs_identifier_is_ufid(sfid) &&
+ !(ufid_flags & OVS_UFID_F_OMIT_KEY);
+}
+
+static bool should_fill_mask(uint32_t ufid_flags)
+{
+ return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
+}
+
+static bool should_fill_actions(uint32_t ufid_flags)
+{
+ return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
+}
+
+static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
+ const struct sw_flow_id *sfid,
+ uint32_t ufid_flags)
+{
+ size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
+
+ /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
+ * see ovs_nla_put_identifier()
+ */
+ if (sfid && ovs_identifier_is_ufid(sfid))
+ len += nla_total_size(sfid->ufid_len);
+ else
+ len += nla_total_size(ovs_key_attr_size());
+
+ /* OVS_FLOW_ATTR_KEY */
+ if (!sfid || should_fill_key(sfid, ufid_flags))
+ len += nla_total_size(ovs_key_attr_size());
+
+ /* OVS_FLOW_ATTR_MASK */
+ if (should_fill_mask(ufid_flags))
+ len += nla_total_size(ovs_key_attr_size());
+
+ /* OVS_FLOW_ATTR_ACTIONS */
+ if (should_fill_actions(ufid_flags))
+ len += nla_total_size(acts->orig_len);
+
+ return len
+ + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
+ + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
+ + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
+ struct sk_buff *skb)
+{
+ struct ovs_flow_stats stats;
+ __be16 tcp_flags;
+ unsigned long used;
+
+ ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
+
+ if (used &&
+ nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
+ OVS_FLOW_ATTR_PAD))
+ return -EMSGSIZE;
+
+ if (stats.n_packets &&
+ nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
+ sizeof(struct ovs_flow_stats), &stats,
+ OVS_FLOW_ATTR_PAD))
+ return -EMSGSIZE;
+
+ if ((u8)ntohs(tcp_flags) &&
+ nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
+ struct sk_buff *skb, int skb_orig_len)
+{
+ struct nlattr *start;
+ int err;
+
+ /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
+ * this is the first flow to be dumped into 'skb'. This is unusual for
+ * Netlink but individual action lists can be longer than
+ * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
+ * The userspace caller can always fetch the actions separately if it
+ * really wants them. (Most userspace callers in fact don't care.)
+ *
+ * This can only fail for dump operations because the skb is always
+ * properly sized for single flows.
+ */
+ start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
+ if (start) {
+ const struct sw_flow_actions *sf_acts;
+
+ sf_acts = rcu_dereference_ovsl(flow->sf_acts);
+ err = ovs_nla_put_actions(sf_acts->actions,
+ sf_acts->actions_len, skb);
+
+ if (!err)
+ nla_nest_end(skb, start);
+ else {
+ if (skb_orig_len)
+ return err;
+
+ nla_nest_cancel(skb, start);
+ }
+ } else if (skb_orig_len) {
+ return -EMSGSIZE;
+ }
+
+ return 0;
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
+ struct sk_buff *skb, u32 portid,
+ u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
+{
+ const int skb_orig_len = skb->len;
+ struct ovs_header *ovs_header;
+ int err;
+
+ ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
+ flags, cmd);
+ if (!ovs_header)
+ return -EMSGSIZE;
+
+ ovs_header->dp_ifindex = dp_ifindex;
+
+ err = ovs_nla_put_identifier(flow, skb);
+ if (err)
+ goto error;
+
+ if (should_fill_key(&flow->id, ufid_flags)) {
+ err = ovs_nla_put_masked_key(flow, skb);
+ if (err)
+ goto error;
+ }
+
+ if (should_fill_mask(ufid_flags)) {
+ err = ovs_nla_put_mask(flow, skb);
+ if (err)
+ goto error;
+ }
+
+ err = ovs_flow_cmd_fill_stats(flow, skb);
+ if (err)
+ goto error;
+
+ if (should_fill_actions(ufid_flags)) {
+ err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
+ if (err)
+ goto error;
+ }
+
+ genlmsg_end(skb, ovs_header);
+ return 0;
+
+error:
+ genlmsg_cancel(skb, ovs_header);
+ return err;
+}
+
+/* May not be called with RCU read lock. */
+static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
+ const struct sw_flow_id *sfid,
+ struct genl_info *info,
+ bool always,
+ uint32_t ufid_flags)
+{
+ struct sk_buff *skb;
+ size_t len;
+
+ if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
+ return NULL;
+
+ len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
+ skb = genlmsg_new(len, GFP_KERNEL);
+ if (!skb)
+ return ERR_PTR(-ENOMEM);
+
+ return skb;
+}
+
+/* Called with ovs_mutex. */
+static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
+ int dp_ifindex,
+ struct genl_info *info, u8 cmd,
+ bool always, u32 ufid_flags)
+{
+ struct sk_buff *skb;
+ int retval;
+
+ skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
+ &flow->id, info, always, ufid_flags);
+ if (IS_ERR_OR_NULL(skb))
+ return skb;
+
+ retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
+ info->snd_portid, info->snd_seq, 0,
+ cmd, ufid_flags);
+ if (WARN_ON_ONCE(retval < 0)) {
+ kfree_skb(skb);
+ skb = ERR_PTR(retval);
+ }
+ return skb;
+}
+
+static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
+{
+ struct net *net = sock_net(skb->sk);
+ struct nlattr **a = info->attrs;
+ struct ovs_header *ovs_header = info->userhdr;
+ struct sw_flow *flow = NULL, *new_flow;
+ struct sw_flow_mask mask;
+ struct sk_buff *reply;
+ struct datapath *dp;
+ struct sw_flow_key *key;
+ struct sw_flow_actions *acts;
+ struct sw_flow_match match;
+ u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
+ int error;
+ bool log = !a[OVS_FLOW_ATTR_PROBE];
+
+ /* Must have key and actions. */
+ error = -EINVAL;
+ if (!a[OVS_FLOW_ATTR_KEY]) {
+ OVS_NLERR(log, "Flow key attr not present in new flow.");
+ goto error;
+ }
+ if (!a[OVS_FLOW_ATTR_ACTIONS]) {
+ OVS_NLERR(log, "Flow actions attr not present in new flow.");
+ goto error;
+ }
+
+ /* Most of the time we need to allocate a new flow, do it before
+ * locking.
+ */
+ new_flow = ovs_flow_alloc();
+ if (IS_ERR(new_flow)) {
+ error = PTR_ERR(new_flow);
+ goto error;
+ }
+
+ /* Extract key. */
+ key = kzalloc(sizeof(*key), GFP_KERNEL);
+ if (!key) {
+ error = -ENOMEM;
+ goto err_kfree_flow;
+ }
+
+ ovs_match_init(&match, key, false, &mask);
+ error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
+ a[OVS_FLOW_ATTR_MASK], log);
+ if (error)
+ goto err_kfree_key;
+
+ ovs_flow_mask_key(&new_flow->key, key, true, &mask);
+
+ /* Extract flow identifier. */
+ error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
+ key, log);
+ if (error)
+ goto err_kfree_key;
+
+ /* Validate actions. */
+ error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
+ &new_flow->key, &acts, log);
+ if (error) {
+ OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
+ goto err_kfree_key;
+ }
+
+ reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
+ ufid_flags);
+ if (IS_ERR(reply)) {
+ error = PTR_ERR(reply);
+ goto err_kfree_acts;
+ }
+
+ ovs_lock();
+ dp = get_dp(net, ovs_header->dp_ifindex);
+ if (unlikely(!dp)) {
+ error = -ENODEV;
+ goto err_unlock_ovs;
+ }
+
+ /* Check if this is a duplicate flow */
+ if (ovs_identifier_is_ufid(&new_flow->id))
+ flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
+ if (!flow)
+ flow = ovs_flow_tbl_lookup(&dp->table, key);
+ if (likely(!flow)) {
+ rcu_assign_pointer(new_flow->sf_acts, acts);
+
+ /* Put flow in bucket. */
+ error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
+ if (unlikely(error)) {
+ acts = NULL;
+ goto err_unlock_ovs;
+ }
+
+ if (unlikely(reply)) {
+ error = ovs_flow_cmd_fill_info(new_flow,
+ ovs_header->dp_ifindex,
+ reply, info->snd_portid,
+ info->snd_seq, 0,
+ OVS_FLOW_CMD_NEW,
+ ufid_flags);
+ BUG_ON(error < 0);
+ }
+ ovs_unlock();
+ } else {
+ struct sw_flow_actions *old_acts;
+
+ /* Bail out if we're not allowed to modify an existing flow.
+ * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
+ * because Generic Netlink treats the latter as a dump
+ * request. We also accept NLM_F_EXCL in case that bug ever
+ * gets fixed.
+ */
+ if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
+ | NLM_F_EXCL))) {
+ error = -EEXIST;
+ goto err_unlock_ovs;
+ }
+ /* The flow identifier has to be the same for flow updates.
+ * Look for any overlapping flow.
+ */
+ if (unlikely(!ovs_flow_cmp(flow, &match))) {
+ if (ovs_identifier_is_key(&flow->id))
+ flow = ovs_flow_tbl_lookup_exact(&dp->table,
+ &match);
+ else /* UFID matches but key is different */
+ flow = NULL;
+ if (!flow) {
+ error = -ENOENT;
+ goto err_unlock_ovs;
+ }
+ }
+ /* Update actions. */
+ old_acts = ovsl_dereference(flow->sf_acts);
+ rcu_assign_pointer(flow->sf_acts, acts);
+
+ if (unlikely(reply)) {
+ error = ovs_flow_cmd_fill_info(flow,
+ ovs_header->dp_ifindex,
+ reply, info->snd_portid,
+ info->snd_seq, 0,
+ OVS_FLOW_CMD_NEW,
+ ufid_flags);
+ BUG_ON(error < 0);
+ }
+ ovs_unlock();
+
+ ovs_nla_free_flow_actions_rcu(old_acts);
+ ovs_flow_free(new_flow, false);
+ }
+
+ if (reply)
+ ovs_notify(&dp_flow_genl_family, reply, info);
+
+ kfree(key);
+ return 0;
+
+err_unlock_ovs:
+ ovs_unlock();
+ kfree_skb(reply);
+err_kfree_acts:
+ ovs_nla_free_flow_actions(acts);
+err_kfree_key:
+ kfree(key);
+err_kfree_flow:
+ ovs_flow_free(new_flow, false);
+error:
+ return error;
+}
+
+/* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
+static noinline_for_stack
+struct sw_flow_actions *get_flow_actions(struct net *net,
+ const struct nlattr *a,
+ const struct sw_flow_key *key,
+ const struct sw_flow_mask *mask,
+ bool log)
+{
+ struct sw_flow_actions *acts;
+ struct sw_flow_key masked_key;
+ int error;
+
+ ovs_flow_mask_key(&masked_key, key, true, mask);
+ error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
+ if (error) {
+ OVS_NLERR(log,
+ "Actions may not be safe on all matching packets");
+ return ERR_PTR(error);
+ }
+
+ return acts;
+}
+
+/* Factor out match-init and action-copy to avoid
+ * "Wframe-larger-than=1024" warning. Because mask is only
+ * used to get actions, we new a function to save some
+ * stack space.
+ *
+ * If there are not key and action attrs, we return 0
+ * directly. In the case, the caller will also not use the
+ * match as before. If there is action attr, we try to get
+ * actions and save them to *acts. Before returning from
+ * the function, we reset the match->mask pointer. Because
+ * we should not to return match object with dangling reference
+ * to mask.
+ * */
+static noinline_for_stack int
+ovs_nla_init_match_and_action(struct net *net,
+ struct sw_flow_match *match,
+ struct sw_flow_key *key,
+ struct nlattr **a,
+ struct sw_flow_actions **acts,
+ bool log)
+{
+ struct sw_flow_mask mask;
+ int error = 0;
+
+ if (a[OVS_FLOW_ATTR_KEY]) {
+ ovs_match_init(match, key, true, &mask);
+ error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
+ a[OVS_FLOW_ATTR_MASK], log);
+ if (error)
+ goto error;
+ }
+
+ if (a[OVS_FLOW_ATTR_ACTIONS]) {
+ if (!a[OVS_FLOW_ATTR_KEY]) {
+ OVS_NLERR(log,
+ "Flow key attribute not present in set flow.");
+ error = -EINVAL;
+ goto error;
+ }
+
+ *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
+ &mask, log);
+ if (IS_ERR(*acts)) {
+ error = PTR_ERR(*acts);
+ goto error;
+ }
+ }
+
+ /* On success, error is 0. */
+error:
+ match->mask = NULL;
+ return error;
+}
+
+static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
+{
+ struct net *net = sock_net(skb->sk);
+ struct nlattr **a = info->attrs;
+ struct ovs_header *ovs_header = info->userhdr;
+ struct sw_flow_key key;
+ struct sw_flow *flow;
+ struct sk_buff *reply = NULL;
+ struct datapath *dp;
+ struct sw_flow_actions *old_acts = NULL, *acts = NULL;
+ struct sw_flow_match match;
+ struct sw_flow_id sfid;
+ u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
+ int error = 0;
+ bool log = !a[OVS_FLOW_ATTR_PROBE];
+ bool ufid_present;
+
+ ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
+ if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
+ OVS_NLERR(log,
+ "Flow set message rejected, Key attribute missing.");
+ return -EINVAL;
+ }
+
+ error = ovs_nla_init_match_and_action(net, &match, &key, a,
+ &acts, log);
+ if (error)
+ goto error;
+
+ if (acts) {
+ /* Can allocate before locking if have acts. */
+ reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
+ ufid_flags);
+ if (IS_ERR(reply)) {
+ error = PTR_ERR(reply);
+ goto err_kfree_acts;
+ }
+ }
+
+ ovs_lock();
+ dp = get_dp(net, ovs_header->dp_ifindex);
+ if (unlikely(!dp)) {
+ error = -ENODEV;
+ goto err_unlock_ovs;
+ }
+ /* Check that the flow exists. */
+ if (ufid_present)
+ flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
+ else
+ flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
+ if (unlikely(!flow)) {
+ error = -ENOENT;
+ goto err_unlock_ovs;
+ }
+
+ /* Update actions, if present. */
+ if (likely(acts)) {
+ old_acts = ovsl_dereference(flow->sf_acts);
+ rcu_assign_pointer(flow->sf_acts, acts);
+
+ if (unlikely(reply)) {
+ error = ovs_flow_cmd_fill_info(flow,
+ ovs_header->dp_ifindex,
+ reply, info->snd_portid,
+ info->snd_seq, 0,
+ OVS_FLOW_CMD_SET,
+ ufid_flags);
+ BUG_ON(error < 0);
+ }
+ } else {
+ /* Could not alloc without acts before locking. */
+ reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
+ info, OVS_FLOW_CMD_SET, false,
+ ufid_flags);
+
+ if (IS_ERR(reply)) {
+ error = PTR_ERR(reply);
+ goto err_unlock_ovs;
+ }
+ }
+
+ /* Clear stats. */
+ if (a[OVS_FLOW_ATTR_CLEAR])
+ ovs_flow_stats_clear(flow);
+ ovs_unlock();
+
+ if (reply)
+ ovs_notify(&dp_flow_genl_family, reply, info);
+ if (old_acts)
+ ovs_nla_free_flow_actions_rcu(old_acts);
+
+ return 0;
+
+err_unlock_ovs:
+ ovs_unlock();
+ kfree_skb(reply);
+err_kfree_acts:
+ ovs_nla_free_flow_actions(acts);
+error:
+ return error;
+}
+
+static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr **a = info->attrs;
+ struct ovs_header *ovs_header = info->userhdr;
+ struct net *net = sock_net(skb->sk);
+ struct sw_flow_key key;
+ struct sk_buff *reply;
+ struct sw_flow *flow;
+ struct datapath *dp;
+ struct sw_flow_match match;
+ struct sw_flow_id ufid;
+ u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
+ int err = 0;
+ bool log = !a[OVS_FLOW_ATTR_PROBE];
+ bool ufid_present;
+
+ ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
+ if (a[OVS_FLOW_ATTR_KEY]) {
+ ovs_match_init(&match, &key, true, NULL);
+ err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
+ log);
+ } else if (!ufid_present) {
+ OVS_NLERR(log,
+ "Flow get message rejected, Key attribute missing.");
+ err = -EINVAL;
+ }
+ if (err)
+ return err;
+
+ ovs_lock();
+ dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+ if (!dp) {
+ err = -ENODEV;
+ goto unlock;
+ }
+
+ if (ufid_present)
+ flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
+ else
+ flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
+ if (!flow) {
+ err = -ENOENT;
+ goto unlock;
+ }
+
+ reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
+ OVS_FLOW_CMD_GET, true, ufid_flags);
+ if (IS_ERR(reply)) {
+ err = PTR_ERR(reply);
+ goto unlock;
+ }
+
+ ovs_unlock();
+ return genlmsg_reply(reply, info);
+unlock:
+ ovs_unlock();
+ return err;
+}
+
+static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr **a = info->attrs;
+ struct ovs_header *ovs_header = info->userhdr;
+ struct net *net = sock_net(skb->sk);
+ struct sw_flow_key key;
+ struct sk_buff *reply;
+ struct sw_flow *flow = NULL;
+ struct datapath *dp;
+ struct sw_flow_match match;
+ struct sw_flow_id ufid;
+ u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
+ int err;
+ bool log = !a[OVS_FLOW_ATTR_PROBE];
+ bool ufid_present;
+
+ ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
+ if (a[OVS_FLOW_ATTR_KEY]) {
+ ovs_match_init(&match, &key, true, NULL);
+ err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
+ NULL, log);
+ if (unlikely(err))
+ return err;
+ }
+
+ ovs_lock();
+ dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+ if (unlikely(!dp)) {
+ err = -ENODEV;
+ goto unlock;
+ }
+
+ if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
+ err = ovs_flow_tbl_flush(&dp->table);
+ goto unlock;
+ }
+
+ if (ufid_present)
+ flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
+ else
+ flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
+ if (unlikely(!flow)) {
+ err = -ENOENT;
+ goto unlock;
+ }
+
+ ovs_flow_tbl_remove(&dp->table, flow);
+ ovs_unlock();
+
+ reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
+ &flow->id, info, false, ufid_flags);
+ if (likely(reply)) {
+ if (!IS_ERR(reply)) {
+ rcu_read_lock(); /*To keep RCU checker happy. */
+ err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
+ reply, info->snd_portid,
+ info->snd_seq, 0,
+ OVS_FLOW_CMD_DEL,
+ ufid_flags);
+ rcu_read_unlock();
+ if (WARN_ON_ONCE(err < 0)) {
+ kfree_skb(reply);
+ goto out_free;
+ }
+
+ ovs_notify(&dp_flow_genl_family, reply, info);
+ } else {
+ netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0,
+ PTR_ERR(reply));
+ }
+ }
+
+out_free:
+ ovs_flow_free(flow, true);
+ return 0;
+unlock:
+ ovs_unlock();
+ return err;
+}
+
+static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct nlattr *a[__OVS_FLOW_ATTR_MAX];
+ struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
+ struct table_instance *ti;
+ struct datapath *dp;
+ u32 ufid_flags;
+ int err;
+
+ err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
+ OVS_FLOW_ATTR_MAX, flow_policy, NULL);
+ if (err)
+ return err;
+ ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
+
+ rcu_read_lock();
+ dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
+ if (!dp) {
+ rcu_read_unlock();
+ return -ENODEV;
+ }
+
+ ti = rcu_dereference(dp->table.ti);
+ for (;;) {
+ struct sw_flow *flow;
+ u32 bucket, obj;
+
+ bucket = cb->args[0];
+ obj = cb->args[1];
+ flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
+ if (!flow)
+ break;
+
+ if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ OVS_FLOW_CMD_GET, ufid_flags) < 0)
+ break;
+
+ cb->args[0] = bucket;
+ cb->args[1] = obj;
+ }
+ rcu_read_unlock();
+ return skb->len;
+}
+
+static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
+ [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
+ [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
+ [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
+ [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
+ [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
+ [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
+ [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
+};
+
+static const struct genl_small_ops dp_flow_genl_ops[] = {
+ { .cmd = OVS_FLOW_CMD_NEW,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+ .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .doit = ovs_flow_cmd_new
+ },
+ { .cmd = OVS_FLOW_CMD_DEL,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+ .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .doit = ovs_flow_cmd_del
+ },
+ { .cmd = OVS_FLOW_CMD_GET,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+ .flags = 0, /* OK for unprivileged users. */
+ .doit = ovs_flow_cmd_get,
+ .dumpit = ovs_flow_cmd_dump
+ },
+ { .cmd = OVS_FLOW_CMD_SET,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+ .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .doit = ovs_flow_cmd_set,
+ },
+};
+
+static struct genl_family dp_flow_genl_family __ro_after_init = {
+ .hdrsize = sizeof(struct ovs_header),
+ .name = OVS_FLOW_FAMILY,
+ .version = OVS_FLOW_VERSION,
+ .maxattr = OVS_FLOW_ATTR_MAX,
+ .policy = flow_policy,
+ .netnsok = true,
+ .parallel_ops = true,
+ .small_ops = dp_flow_genl_ops,
+ .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
+ .mcgrps = &ovs_dp_flow_multicast_group,
+ .n_mcgrps = 1,
+ .module = THIS_MODULE,
+};
+
+static size_t ovs_dp_cmd_msg_size(void)
+{
+ size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
+
+ msgsize += nla_total_size(IFNAMSIZ);
+ msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
+ msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
+ msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
+ msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
+
+ return msgsize;
+}
+
+/* Called with ovs_mutex. */
+static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
+ u32 portid, u32 seq, u32 flags, u8 cmd)
+{
+ struct ovs_header *ovs_header;
+ struct ovs_dp_stats dp_stats;
+ struct ovs_dp_megaflow_stats dp_megaflow_stats;
+ int err;
+
+ ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
+ flags, cmd);
+ if (!ovs_header)
+ goto error;
+
+ ovs_header->dp_ifindex = get_dpifindex(dp);
+
+ err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
+ if (err)
+ goto nla_put_failure;
+
+ get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
+ if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
+ &dp_stats, OVS_DP_ATTR_PAD))
+ goto nla_put_failure;
+
+ if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
+ sizeof(struct ovs_dp_megaflow_stats),
+ &dp_megaflow_stats, OVS_DP_ATTR_PAD))
+ goto nla_put_failure;
+
+ if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
+ goto nla_put_failure;
+
+ if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
+ ovs_flow_tbl_masks_cache_size(&dp->table)))
+ goto nla_put_failure;
+
+ genlmsg_end(skb, ovs_header);
+ return 0;
+
+nla_put_failure:
+ genlmsg_cancel(skb, ovs_header);
+error:
+ return -EMSGSIZE;
+}
+
+static struct sk_buff *ovs_dp_cmd_alloc_info(void)
+{
+ return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
+}
+
+/* Called with rcu_read_lock or ovs_mutex. */
+static struct datapath *lookup_datapath(struct net *net,
+ const struct ovs_header *ovs_header,
+ struct nlattr *a[OVS_DP_ATTR_MAX + 1])
+{
+ struct datapath *dp;
+
+ if (!a[OVS_DP_ATTR_NAME])
+ dp = get_dp(net, ovs_header->dp_ifindex);
+ else {
+ struct vport *vport;
+
+ vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
+ dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
+ }
+ return dp ? dp : ERR_PTR(-ENODEV);
+}
+
+static void ovs_dp_reset_user_features(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ struct datapath *dp;
+
+ dp = lookup_datapath(sock_net(skb->sk), info->userhdr,
+ info->attrs);
+ if (IS_ERR(dp))
+ return;
+
+ pr_warn("%s: Dropping previously announced user features\n",
+ ovs_dp_name(dp));
+ dp->user_features = 0;
+}
+
+DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support);
+
+static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
+{
+ u32 user_features = 0;
+
+ if (a[OVS_DP_ATTR_USER_FEATURES]) {
+ user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
+
+ if (user_features & ~(OVS_DP_F_VPORT_PIDS |
+ OVS_DP_F_UNALIGNED |
+ OVS_DP_F_TC_RECIRC_SHARING))
+ return -EOPNOTSUPP;
+
+#if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
+ if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
+ return -EOPNOTSUPP;
+#endif
+ }
+
+ if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
+ int err;
+ u32 cache_size;
+
+ cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
+ err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
+ if (err)
+ return err;
+ }
+
+ dp->user_features = user_features;
+
+ if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
+ static_branch_enable(&tc_recirc_sharing_support);
+ else
+ static_branch_disable(&tc_recirc_sharing_support);
+
+ return 0;
+}
+
+static int ovs_dp_stats_init(struct datapath *dp)
+{
+ dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
+ if (!dp->stats_percpu)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int ovs_dp_vport_init(struct datapath *dp)
+{
+ int i;
+
+ dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
+ sizeof(struct hlist_head),
+ GFP_KERNEL);
+ if (!dp->ports)
+ return -ENOMEM;
+
+ for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
+ INIT_HLIST_HEAD(&dp->ports[i]);
+
+ return 0;
+}
+
+static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr **a = info->attrs;
+ struct vport_parms parms;
+ struct sk_buff *reply;
+ struct datapath *dp;
+ struct vport *vport;
+ struct ovs_net *ovs_net;
+ int err;
+
+ err = -EINVAL;
+ if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
+ goto err;
+
+ reply = ovs_dp_cmd_alloc_info();
+ if (!reply)
+ return -ENOMEM;
+
+ err = -ENOMEM;
+ dp = kzalloc(sizeof(*dp), GFP_KERNEL);
+ if (dp == NULL)
+ goto err_destroy_reply;
+
+ ovs_dp_set_net(dp, sock_net(skb->sk));
+
+ /* Allocate table. */
+ err = ovs_flow_tbl_init(&dp->table);
+ if (err)
+ goto err_destroy_dp;
+
+ err = ovs_dp_stats_init(dp);
+ if (err)
+ goto err_destroy_table;
+
+ err = ovs_dp_vport_init(dp);
+ if (err)
+ goto err_destroy_stats;
+
+ err = ovs_meters_init(dp);
+ if (err)
+ goto err_destroy_ports;
+
+ /* Set up our datapath device. */
+ parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
+ parms.type = OVS_VPORT_TYPE_INTERNAL;
+ parms.options = NULL;
+ parms.dp = dp;
+ parms.port_no = OVSP_LOCAL;
+ parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
+
+ /* So far only local changes have been made, now need the lock. */
+ ovs_lock();
+
+ err = ovs_dp_change(dp, a);
+ if (err)
+ goto err_unlock_and_destroy_meters;
+
+ vport = new_vport(&parms);
+ if (IS_ERR(vport)) {
+ err = PTR_ERR(vport);
+ if (err == -EBUSY)
+ err = -EEXIST;
+
+ if (err == -EEXIST) {
+ /* An outdated user space instance that does not understand
+ * the concept of user_features has attempted to create a new
+ * datapath and is likely to reuse it. Drop all user features.
+ */
+ if (info->genlhdr->version < OVS_DP_VER_FEATURES)
+ ovs_dp_reset_user_features(skb, info);
+ }
+
+ goto err_unlock_and_destroy_meters;
+ }
+
+ err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
+ info->snd_seq, 0, OVS_DP_CMD_NEW);
+ BUG_ON(err < 0);
+
+ ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
+ list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
+
+ ovs_unlock();
+
+ ovs_notify(&dp_datapath_genl_family, reply, info);
+ return 0;
+
+err_unlock_and_destroy_meters:
+ ovs_unlock();
+ ovs_meters_exit(dp);
+err_destroy_ports:
+ kfree(dp->ports);
+err_destroy_stats:
+ free_percpu(dp->stats_percpu);
+err_destroy_table:
+ ovs_flow_tbl_destroy(&dp->table);
+err_destroy_dp:
+ kfree(dp);
+err_destroy_reply:
+ kfree_skb(reply);
+err:
+ return err;
+}
+
+/* Called with ovs_mutex. */
+static void __dp_destroy(struct datapath *dp)
+{
+ struct flow_table *table = &dp->table;
+ int i;
+
+ for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
+ struct vport *vport;
+ struct hlist_node *n;
+
+ hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
+ if (vport->port_no != OVSP_LOCAL)
+ ovs_dp_detach_port(vport);
+ }
+
+ list_del_rcu(&dp->list_node);
+
+ /* OVSP_LOCAL is datapath internal port. We need to make sure that
+ * all ports in datapath are destroyed first before freeing datapath.
+ */
+ ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
+
+ /* Flush sw_flow in the tables. RCU cb only releases resource
+ * such as dp, ports and tables. That may avoid some issues
+ * such as RCU usage warning.
+ */
+ table_instance_flow_flush(table, ovsl_dereference(table->ti),
+ ovsl_dereference(table->ufid_ti));
+
+ /* RCU destroy the ports, meters and flow tables. */
+ call_rcu(&dp->rcu, destroy_dp_rcu);
+}
+
+static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
+{
+ struct sk_buff *reply;
+ struct datapath *dp;
+ int err;
+
+ reply = ovs_dp_cmd_alloc_info();
+ if (!reply)
+ return -ENOMEM;
+
+ ovs_lock();
+ dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
+ err = PTR_ERR(dp);
+ if (IS_ERR(dp))
+ goto err_unlock_free;
+
+ err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
+ info->snd_seq, 0, OVS_DP_CMD_DEL);
+ BUG_ON(err < 0);
+
+ __dp_destroy(dp);
+ ovs_unlock();
+
+ ovs_notify(&dp_datapath_genl_family, reply, info);
+
+ return 0;
+
+err_unlock_free:
+ ovs_unlock();
+ kfree_skb(reply);
+ return err;
+}
+
+static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
+{
+ struct sk_buff *reply;
+ struct datapath *dp;
+ int err;
+
+ reply = ovs_dp_cmd_alloc_info();
+ if (!reply)
+ return -ENOMEM;
+
+ ovs_lock();
+ dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
+ err = PTR_ERR(dp);
+ if (IS_ERR(dp))
+ goto err_unlock_free;
+
+ err = ovs_dp_change(dp, info->attrs);
+ if (err)
+ goto err_unlock_free;
+
+ err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
+ info->snd_seq, 0, OVS_DP_CMD_SET);
+ BUG_ON(err < 0);
+
+ ovs_unlock();
+ ovs_notify(&dp_datapath_genl_family, reply, info);
+
+ return 0;
+
+err_unlock_free:
+ ovs_unlock();
+ kfree_skb(reply);
+ return err;
+}
+
+static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
+{
+ struct sk_buff *reply;
+ struct datapath *dp;
+ int err;
+
+ reply = ovs_dp_cmd_alloc_info();
+ if (!reply)
+ return -ENOMEM;
+
+ ovs_lock();
+ dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
+ if (IS_ERR(dp)) {
+ err = PTR_ERR(dp);
+ goto err_unlock_free;
+ }
+ err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
+ info->snd_seq, 0, OVS_DP_CMD_GET);
+ BUG_ON(err < 0);
+ ovs_unlock();
+
+ return genlmsg_reply(reply, info);
+
+err_unlock_free:
+ ovs_unlock();
+ kfree_skb(reply);
+ return err;
+}
+
+static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
+ struct datapath *dp;
+ int skip = cb->args[0];
+ int i = 0;
+
+ ovs_lock();
+ list_for_each_entry(dp, &ovs_net->dps, list_node) {
+ if (i >= skip &&
+ ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ OVS_DP_CMD_GET) < 0)
+ break;
+ i++;
+ }
+ ovs_unlock();
+
+ cb->args[0] = i;
+
+ return skb->len;
+}
+
+static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
+ [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
+ [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
+ [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
+ [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0,
+ PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
+};
+
+static const struct genl_small_ops dp_datapath_genl_ops[] = {
+ { .cmd = OVS_DP_CMD_NEW,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+ .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .doit = ovs_dp_cmd_new
+ },
+ { .cmd = OVS_DP_CMD_DEL,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+ .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .doit = ovs_dp_cmd_del
+ },
+ { .cmd = OVS_DP_CMD_GET,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+ .flags = 0, /* OK for unprivileged users. */
+ .doit = ovs_dp_cmd_get,
+ .dumpit = ovs_dp_cmd_dump
+ },
+ { .cmd = OVS_DP_CMD_SET,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+ .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .doit = ovs_dp_cmd_set,
+ },
+};
+
+static struct genl_family dp_datapath_genl_family __ro_after_init = {
+ .hdrsize = sizeof(struct ovs_header),
+ .name = OVS_DATAPATH_FAMILY,
+ .version = OVS_DATAPATH_VERSION,
+ .maxattr = OVS_DP_ATTR_MAX,
+ .policy = datapath_policy,
+ .netnsok = true,
+ .parallel_ops = true,
+ .small_ops = dp_datapath_genl_ops,
+ .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
+ .mcgrps = &ovs_dp_datapath_multicast_group,
+ .n_mcgrps = 1,
+ .module = THIS_MODULE,
+};
+
+/* Called with ovs_mutex or RCU read lock. */
+static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
+ struct net *net, u32 portid, u32 seq,
+ u32 flags, u8 cmd, gfp_t gfp)
+{
+ struct ovs_header *ovs_header;
+ struct ovs_vport_stats vport_stats;
+ int err;
+
+ ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
+ flags, cmd);
+ if (!ovs_header)
+ return -EMSGSIZE;
+
+ ovs_header->dp_ifindex = get_dpifindex(vport->dp);
+
+ if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
+ nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
+ nla_put_string(skb, OVS_VPORT_ATTR_NAME,
+ ovs_vport_name(vport)) ||
+ nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
+ goto nla_put_failure;
+
+ if (!net_eq(net, dev_net(vport->dev))) {
+ int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
+
+ if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
+ goto nla_put_failure;
+ }
+
+ ovs_vport_get_stats(vport, &vport_stats);
+ if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
+ sizeof(struct ovs_vport_stats), &vport_stats,
+ OVS_VPORT_ATTR_PAD))
+ goto nla_put_failure;
+
+ if (ovs_vport_get_upcall_portids(vport, skb))
+ goto nla_put_failure;
+
+ err = ovs_vport_get_options(vport, skb);
+ if (err == -EMSGSIZE)
+ goto error;
+
+ genlmsg_end(skb, ovs_header);
+ return 0;
+
+nla_put_failure:
+ err = -EMSGSIZE;
+error:
+ genlmsg_cancel(skb, ovs_header);
+ return err;
+}
+
+static struct sk_buff *ovs_vport_cmd_alloc_info(void)
+{
+ return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+}
+
+/* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
+struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
+ u32 portid, u32 seq, u8 cmd)
+{
+ struct sk_buff *skb;
+ int retval;
+
+ skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!skb)
+ return ERR_PTR(-ENOMEM);
+
+ retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
+ GFP_KERNEL);
+ BUG_ON(retval < 0);
+
+ return skb;
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+static struct vport *lookup_vport(struct net *net,
+ const struct ovs_header *ovs_header,
+ struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
+{
+ struct datapath *dp;
+ struct vport *vport;
+
+ if (a[OVS_VPORT_ATTR_IFINDEX])
+ return ERR_PTR(-EOPNOTSUPP);
+ if (a[OVS_VPORT_ATTR_NAME]) {
+ vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
+ if (!vport)
+ return ERR_PTR(-ENODEV);
+ if (ovs_header->dp_ifindex &&
+ ovs_header->dp_ifindex != get_dpifindex(vport->dp))
+ return ERR_PTR(-ENODEV);
+ return vport;
+ } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
+ u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
+
+ if (port_no >= DP_MAX_PORTS)
+ return ERR_PTR(-EFBIG);
+
+ dp = get_dp(net, ovs_header->dp_ifindex);
+ if (!dp)
+ return ERR_PTR(-ENODEV);
+
+ vport = ovs_vport_ovsl_rcu(dp, port_no);
+ if (!vport)
+ return ERR_PTR(-ENODEV);
+ return vport;
+ } else
+ return ERR_PTR(-EINVAL);
+
+}
+
+static unsigned int ovs_get_max_headroom(struct datapath *dp)
+{
+ unsigned int dev_headroom, max_headroom = 0;
+ struct net_device *dev;
+ struct vport *vport;
+ int i;
+
+ for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
+ hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
+ lockdep_ovsl_is_held()) {
+ dev = vport->dev;
+ dev_headroom = netdev_get_fwd_headroom(dev);
+ if (dev_headroom > max_headroom)
+ max_headroom = dev_headroom;
+ }
+ }
+
+ return max_headroom;
+}
+
+/* Called with ovs_mutex */
+static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
+{
+ struct vport *vport;
+ int i;
+
+ dp->max_headroom = new_headroom;
+ for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
+ hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
+ lockdep_ovsl_is_held())
+ netdev_set_rx_headroom(vport->dev, new_headroom);
+ }
+}
+
+static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr **a = info->attrs;
+ struct ovs_header *ovs_header = info->userhdr;
+ struct vport_parms parms;
+ struct sk_buff *reply;
+ struct vport *vport;
+ struct datapath *dp;
+ unsigned int new_headroom;
+ u32 port_no;
+ int err;
+
+ if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
+ !a[OVS_VPORT_ATTR_UPCALL_PID])
+ return -EINVAL;
+ if (a[OVS_VPORT_ATTR_IFINDEX])
+ return -EOPNOTSUPP;
+
+ port_no = a[OVS_VPORT_ATTR_PORT_NO]
+ ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
+ if (port_no >= DP_MAX_PORTS)
+ return -EFBIG;
+
+ reply = ovs_vport_cmd_alloc_info();
+ if (!reply)
+ return -ENOMEM;
+
+ ovs_lock();
+restart:
+ dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+ err = -ENODEV;
+ if (!dp)
+ goto exit_unlock_free;
+
+ if (port_no) {
+ vport = ovs_vport_ovsl(dp, port_no);
+ err = -EBUSY;
+ if (vport)
+ goto exit_unlock_free;
+ } else {
+ for (port_no = 1; ; port_no++) {
+ if (port_no >= DP_MAX_PORTS) {
+ err = -EFBIG;
+ goto exit_unlock_free;
+ }
+ vport = ovs_vport_ovsl(dp, port_no);
+ if (!vport)
+ break;
+ }
+ }
+
+ parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
+ parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
+ parms.options = a[OVS_VPORT_ATTR_OPTIONS];
+ parms.dp = dp;
+ parms.port_no = port_no;
+ parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
+
+ vport = new_vport(&parms);
+ err = PTR_ERR(vport);
+ if (IS_ERR(vport)) {
+ if (err == -EAGAIN)
+ goto restart;
+ goto exit_unlock_free;
+ }
+
+ err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
+ info->snd_portid, info->snd_seq, 0,
+ OVS_VPORT_CMD_NEW, GFP_KERNEL);
+
+ new_headroom = netdev_get_fwd_headroom(vport->dev);
+
+ if (new_headroom > dp->max_headroom)
+ ovs_update_headroom(dp, new_headroom);
+ else
+ netdev_set_rx_headroom(vport->dev, dp->max_headroom);
+
+ BUG_ON(err < 0);
+ ovs_unlock();
+
+ ovs_notify(&dp_vport_genl_family, reply, info);
+ return 0;
+
+exit_unlock_free:
+ ovs_unlock();
+ kfree_skb(reply);
+ return err;
+}
+
+static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr **a = info->attrs;
+ struct sk_buff *reply;
+ struct vport *vport;
+ int err;
+
+ reply = ovs_vport_cmd_alloc_info();
+ if (!reply)
+ return -ENOMEM;
+
+ ovs_lock();
+ vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
+ err = PTR_ERR(vport);
+ if (IS_ERR(vport))
+ goto exit_unlock_free;
+
+ if (a[OVS_VPORT_ATTR_TYPE] &&
+ nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
+ err = -EINVAL;
+ goto exit_unlock_free;
+ }
+
+ if (a[OVS_VPORT_ATTR_OPTIONS]) {
+ err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
+ if (err)
+ goto exit_unlock_free;
+ }
+
+
+ if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
+ struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
+
+ err = ovs_vport_set_upcall_portids(vport, ids);
+ if (err)
+ goto exit_unlock_free;
+ }
+
+ err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
+ info->snd_portid, info->snd_seq, 0,
+ OVS_VPORT_CMD_SET, GFP_KERNEL);
+ BUG_ON(err < 0);
+
+ ovs_unlock();
+ ovs_notify(&dp_vport_genl_family, reply, info);
+ return 0;
+
+exit_unlock_free:
+ ovs_unlock();
+ kfree_skb(reply);
+ return err;
+}
+
+static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
+{
+ bool update_headroom = false;
+ struct nlattr **a = info->attrs;
+ struct sk_buff *reply;
+ struct datapath *dp;
+ struct vport *vport;
+ unsigned int new_headroom;
+ int err;
+
+ reply = ovs_vport_cmd_alloc_info();
+ if (!reply)
+ return -ENOMEM;
+
+ ovs_lock();
+ vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
+ err = PTR_ERR(vport);
+ if (IS_ERR(vport))
+ goto exit_unlock_free;
+
+ if (vport->port_no == OVSP_LOCAL) {
+ err = -EINVAL;
+ goto exit_unlock_free;
+ }
+
+ err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
+ info->snd_portid, info->snd_seq, 0,
+ OVS_VPORT_CMD_DEL, GFP_KERNEL);
+ BUG_ON(err < 0);
+
+ /* the vport deletion may trigger dp headroom update */
+ dp = vport->dp;
+ if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
+ update_headroom = true;
+
+ netdev_reset_rx_headroom(vport->dev);
+ ovs_dp_detach_port(vport);
+
+ if (update_headroom) {
+ new_headroom = ovs_get_max_headroom(dp);
+
+ if (new_headroom < dp->max_headroom)
+ ovs_update_headroom(dp, new_headroom);
+ }
+ ovs_unlock();
+
+ ovs_notify(&dp_vport_genl_family, reply, info);
+ return 0;
+
+exit_unlock_free:
+ ovs_unlock();
+ kfree_skb(reply);
+ return err;
+}
+
+static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr **a = info->attrs;
+ struct ovs_header *ovs_header = info->userhdr;
+ struct sk_buff *reply;
+ struct vport *vport;
+ int err;
+
+ reply = ovs_vport_cmd_alloc_info();
+ if (!reply)
+ return -ENOMEM;
+
+ rcu_read_lock();
+ vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
+ err = PTR_ERR(vport);
+ if (IS_ERR(vport))
+ goto exit_unlock_free;
+ err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
+ info->snd_portid, info->snd_seq, 0,
+ OVS_VPORT_CMD_GET, GFP_ATOMIC);
+ BUG_ON(err < 0);
+ rcu_read_unlock();
+
+ return genlmsg_reply(reply, info);
+
+exit_unlock_free:
+ rcu_read_unlock();
+ kfree_skb(reply);
+ return err;
+}
+
+static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
+ struct datapath *dp;
+ int bucket = cb->args[0], skip = cb->args[1];
+ int i, j = 0;
+
+ rcu_read_lock();
+ dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
+ if (!dp) {
+ rcu_read_unlock();
+ return -ENODEV;
+ }
+ for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
+ struct vport *vport;
+
+ j = 0;
+ hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
+ if (j >= skip &&
+ ovs_vport_cmd_fill_info(vport, skb,
+ sock_net(skb->sk),
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ NLM_F_MULTI,
+ OVS_VPORT_CMD_GET,
+ GFP_ATOMIC) < 0)
+ goto out;
+
+ j++;
+ }
+ skip = 0;
+ }
+out:
+ rcu_read_unlock();
+
+ cb->args[0] = i;
+ cb->args[1] = j;
+
+ return skb->len;
+}
+
+static void ovs_dp_masks_rebalance(struct work_struct *work)
+{
+ struct ovs_net *ovs_net = container_of(work, struct ovs_net,
+ masks_rebalance.work);
+ struct datapath *dp;
+
+ ovs_lock();
+
+ list_for_each_entry(dp, &ovs_net->dps, list_node)
+ ovs_flow_masks_rebalance(&dp->table);
+
+ ovs_unlock();
+
+ schedule_delayed_work(&ovs_net->masks_rebalance,
+ msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
+}
+
+static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
+ [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
+ [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
+ [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
+ [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
+ [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
+ [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
+ [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
+ [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
+};
+
+static const struct genl_small_ops dp_vport_genl_ops[] = {
+ { .cmd = OVS_VPORT_CMD_NEW,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+ .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .doit = ovs_vport_cmd_new
+ },
+ { .cmd = OVS_VPORT_CMD_DEL,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+ .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .doit = ovs_vport_cmd_del
+ },
+ { .cmd = OVS_VPORT_CMD_GET,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+ .flags = 0, /* OK for unprivileged users. */
+ .doit = ovs_vport_cmd_get,
+ .dumpit = ovs_vport_cmd_dump
+ },
+ { .cmd = OVS_VPORT_CMD_SET,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+ .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
+ .doit = ovs_vport_cmd_set,
+ },
+};
+
+struct genl_family dp_vport_genl_family __ro_after_init = {
+ .hdrsize = sizeof(struct ovs_header),
+ .name = OVS_VPORT_FAMILY,
+ .version = OVS_VPORT_VERSION,
+ .maxattr = OVS_VPORT_ATTR_MAX,
+ .policy = vport_policy,
+ .netnsok = true,
+ .parallel_ops = true,
+ .small_ops = dp_vport_genl_ops,
+ .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops),
+ .mcgrps = &ovs_dp_vport_multicast_group,
+ .n_mcgrps = 1,
+ .module = THIS_MODULE,
+};
+
+static struct genl_family * const dp_genl_families[] = {
+ &dp_datapath_genl_family,
+ &dp_vport_genl_family,
+ &dp_flow_genl_family,
+ &dp_packet_genl_family,
+ &dp_meter_genl_family,
+#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
+ &dp_ct_limit_genl_family,
+#endif
+};
+
+static void dp_unregister_genl(int n_families)
+{
+ int i;
+
+ for (i = 0; i < n_families; i++)
+ genl_unregister_family(dp_genl_families[i]);
+}
+
+static int __init dp_register_genl(void)
+{
+ int err;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
+
+ err = genl_register_family(dp_genl_families[i]);
+ if (err)
+ goto error;
+ }
+
+ return 0;
+
+error:
+ dp_unregister_genl(i);
+ return err;
+}
+
+static int __net_init ovs_init_net(struct net *net)
+{
+ struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
+ int err;
+
+ INIT_LIST_HEAD(&ovs_net->dps);
+ INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
+ INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
+
+ err = ovs_ct_init(net);
+ if (err)
+ return err;
+
+ schedule_delayed_work(&ovs_net->masks_rebalance,
+ msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
+ return 0;
+}
+
+static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
+ struct list_head *head)
+{
+ struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
+ struct datapath *dp;
+
+ list_for_each_entry(dp, &ovs_net->dps, list_node) {
+ int i;
+
+ for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
+ struct vport *vport;
+
+ hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
+ if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
+ continue;
+
+ if (dev_net(vport->dev) == dnet)
+ list_add(&vport->detach_list, head);
+ }
+ }
+ }
+}
+
+static void __net_exit ovs_exit_net(struct net *dnet)
+{
+ struct datapath *dp, *dp_next;
+ struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
+ struct vport *vport, *vport_next;
+ struct net *net;
+ LIST_HEAD(head);
+
+ ovs_lock();
+
+ ovs_ct_exit(dnet);
+
+ list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
+ __dp_destroy(dp);
+
+ down_read(&net_rwsem);
+ for_each_net(net)
+ list_vports_from_net(net, dnet, &head);
+ up_read(&net_rwsem);
+
+ /* Detach all vports from given namespace. */
+ list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
+ list_del(&vport->detach_list);
+ ovs_dp_detach_port(vport);
+ }
+
+ ovs_unlock();
+
+ cancel_delayed_work_sync(&ovs_net->masks_rebalance);
+ cancel_work_sync(&ovs_net->dp_notify_work);
+}
+
+static struct pernet_operations ovs_net_ops = {
+ .init = ovs_init_net,
+ .exit = ovs_exit_net,
+ .id = &ovs_net_id,
+ .size = sizeof(struct ovs_net),
+};
+
+static int __init dp_init(void)
+{
+ int err;
+
+ BUILD_BUG_ON(sizeof(struct ovs_skb_cb) >
+ sizeof_field(struct sk_buff, cb));
+
+ pr_info("Open vSwitch switching datapath\n");
+
+ err = action_fifos_init();
+ if (err)
+ goto error;
+
+ err = ovs_internal_dev_rtnl_link_register();
+ if (err)
+ goto error_action_fifos_exit;
+
+ err = ovs_flow_init();
+ if (err)
+ goto error_unreg_rtnl_link;
+
+ err = ovs_vport_init();
+ if (err)
+ goto error_flow_exit;
+
+ err = register_pernet_device(&ovs_net_ops);
+ if (err)
+ goto error_vport_exit;
+
+ err = register_netdevice_notifier(&ovs_dp_device_notifier);
+ if (err)
+ goto error_netns_exit;
+
+ err = ovs_netdev_init();
+ if (err)
+ goto error_unreg_notifier;
+
+ err = dp_register_genl();
+ if (err < 0)
+ goto error_unreg_netdev;
+
+ return 0;
+
+error_unreg_netdev:
+ ovs_netdev_exit();
+error_unreg_notifier:
+ unregister_netdevice_notifier(&ovs_dp_device_notifier);
+error_netns_exit:
+ unregister_pernet_device(&ovs_net_ops);
+error_vport_exit:
+ ovs_vport_exit();
+error_flow_exit:
+ ovs_flow_exit();
+error_unreg_rtnl_link:
+ ovs_internal_dev_rtnl_link_unregister();
+error_action_fifos_exit:
+ action_fifos_exit();
+error:
+ return err;
+}
+
+static void dp_cleanup(void)
+{
+ dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
+ ovs_netdev_exit();
+ unregister_netdevice_notifier(&ovs_dp_device_notifier);
+ unregister_pernet_device(&ovs_net_ops);
+ rcu_barrier();
+ ovs_vport_exit();
+ ovs_flow_exit();
+ ovs_internal_dev_rtnl_link_unregister();
+ action_fifos_exit();
+}
+
+module_init(dp_init);
+module_exit(dp_cleanup);
+
+MODULE_DESCRIPTION("Open vSwitch switching datapath");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
+MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
+MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
+MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
+MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
+MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 12:29:11 +0000