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-rw-r--r--net/openvswitch/actions.c1629
1 files changed, 1629 insertions, 0 deletions
diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
new file mode 100644
index 000000000..a8cf9a887
--- /dev/null
+++ b/net/openvswitch/actions.c
@@ -0,0 +1,1629 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2007-2017 Nicira, Inc.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/skbuff.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/openvswitch.h>
+#include <linux/sctp.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/in6.h>
+#include <linux/if_arp.h>
+#include <linux/if_vlan.h>
+
+#include <net/dst.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/ip6_fib.h>
+#include <net/checksum.h>
+#include <net/dsfield.h>
+#include <net/mpls.h>
+#include <net/sctp/checksum.h>
+
+#include "datapath.h"
+#include "flow.h"
+#include "conntrack.h"
+#include "vport.h"
+#include "flow_netlink.h"
+#include "openvswitch_trace.h"
+
+struct deferred_action {
+ struct sk_buff *skb;
+ const struct nlattr *actions;
+ int actions_len;
+
+ /* Store pkt_key clone when creating deferred action. */
+ struct sw_flow_key pkt_key;
+};
+
+#define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN)
+struct ovs_frag_data {
+ unsigned long dst;
+ struct vport *vport;
+ struct ovs_skb_cb cb;
+ __be16 inner_protocol;
+ u16 network_offset; /* valid only for MPLS */
+ u16 vlan_tci;
+ __be16 vlan_proto;
+ unsigned int l2_len;
+ u8 mac_proto;
+ u8 l2_data[MAX_L2_LEN];
+};
+
+static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage);
+
+#define DEFERRED_ACTION_FIFO_SIZE 10
+#define OVS_RECURSION_LIMIT 5
+#define OVS_DEFERRED_ACTION_THRESHOLD (OVS_RECURSION_LIMIT - 2)
+struct action_fifo {
+ int head;
+ int tail;
+ /* Deferred action fifo queue storage. */
+ struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE];
+};
+
+struct action_flow_keys {
+ struct sw_flow_key key[OVS_DEFERRED_ACTION_THRESHOLD];
+};
+
+static struct action_fifo __percpu *action_fifos;
+static struct action_flow_keys __percpu *flow_keys;
+static DEFINE_PER_CPU(int, exec_actions_level);
+
+/* Make a clone of the 'key', using the pre-allocated percpu 'flow_keys'
+ * space. Return NULL if out of key spaces.
+ */
+static struct sw_flow_key *clone_key(const struct sw_flow_key *key_)
+{
+ struct action_flow_keys *keys = this_cpu_ptr(flow_keys);
+ int level = this_cpu_read(exec_actions_level);
+ struct sw_flow_key *key = NULL;
+
+ if (level <= OVS_DEFERRED_ACTION_THRESHOLD) {
+ key = &keys->key[level - 1];
+ *key = *key_;
+ }
+
+ return key;
+}
+
+static void action_fifo_init(struct action_fifo *fifo)
+{
+ fifo->head = 0;
+ fifo->tail = 0;
+}
+
+static bool action_fifo_is_empty(const struct action_fifo *fifo)
+{
+ return (fifo->head == fifo->tail);
+}
+
+static struct deferred_action *action_fifo_get(struct action_fifo *fifo)
+{
+ if (action_fifo_is_empty(fifo))
+ return NULL;
+
+ return &fifo->fifo[fifo->tail++];
+}
+
+static struct deferred_action *action_fifo_put(struct action_fifo *fifo)
+{
+ if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1)
+ return NULL;
+
+ return &fifo->fifo[fifo->head++];
+}
+
+/* Return true if fifo is not full */
+static struct deferred_action *add_deferred_actions(struct sk_buff *skb,
+ const struct sw_flow_key *key,
+ const struct nlattr *actions,
+ const int actions_len)
+{
+ struct action_fifo *fifo;
+ struct deferred_action *da;
+
+ fifo = this_cpu_ptr(action_fifos);
+ da = action_fifo_put(fifo);
+ if (da) {
+ da->skb = skb;
+ da->actions = actions;
+ da->actions_len = actions_len;
+ da->pkt_key = *key;
+ }
+
+ return da;
+}
+
+static void invalidate_flow_key(struct sw_flow_key *key)
+{
+ key->mac_proto |= SW_FLOW_KEY_INVALID;
+}
+
+static bool is_flow_key_valid(const struct sw_flow_key *key)
+{
+ return !(key->mac_proto & SW_FLOW_KEY_INVALID);
+}
+
+static int clone_execute(struct datapath *dp, struct sk_buff *skb,
+ struct sw_flow_key *key,
+ u32 recirc_id,
+ const struct nlattr *actions, int len,
+ bool last, bool clone_flow_key);
+
+static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
+ struct sw_flow_key *key,
+ const struct nlattr *attr, int len);
+
+static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
+ __be32 mpls_lse, __be16 mpls_ethertype, __u16 mac_len)
+{
+ int err;
+
+ err = skb_mpls_push(skb, mpls_lse, mpls_ethertype, mac_len, !!mac_len);
+ if (err)
+ return err;
+
+ if (!mac_len)
+ key->mac_proto = MAC_PROTO_NONE;
+
+ invalidate_flow_key(key);
+ return 0;
+}
+
+static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
+ const __be16 ethertype)
+{
+ int err;
+
+ err = skb_mpls_pop(skb, ethertype, skb->mac_len,
+ ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET);
+ if (err)
+ return err;
+
+ if (ethertype == htons(ETH_P_TEB))
+ key->mac_proto = MAC_PROTO_ETHERNET;
+
+ invalidate_flow_key(key);
+ return 0;
+}
+
+static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key,
+ const __be32 *mpls_lse, const __be32 *mask)
+{
+ struct mpls_shim_hdr *stack;
+ __be32 lse;
+ int err;
+
+ if (!pskb_may_pull(skb, skb_network_offset(skb) + MPLS_HLEN))
+ return -ENOMEM;
+
+ stack = mpls_hdr(skb);
+ lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask);
+ err = skb_mpls_update_lse(skb, lse);
+ if (err)
+ return err;
+
+ flow_key->mpls.lse[0] = lse;
+ return 0;
+}
+
+static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key)
+{
+ int err;
+
+ err = skb_vlan_pop(skb);
+ if (skb_vlan_tag_present(skb)) {
+ invalidate_flow_key(key);
+ } else {
+ key->eth.vlan.tci = 0;
+ key->eth.vlan.tpid = 0;
+ }
+ return err;
+}
+
+static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key,
+ const struct ovs_action_push_vlan *vlan)
+{
+ if (skb_vlan_tag_present(skb)) {
+ invalidate_flow_key(key);
+ } else {
+ key->eth.vlan.tci = vlan->vlan_tci;
+ key->eth.vlan.tpid = vlan->vlan_tpid;
+ }
+ return skb_vlan_push(skb, vlan->vlan_tpid,
+ ntohs(vlan->vlan_tci) & ~VLAN_CFI_MASK);
+}
+
+/* 'src' is already properly masked. */
+static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_)
+{
+ u16 *dst = (u16 *)dst_;
+ const u16 *src = (const u16 *)src_;
+ const u16 *mask = (const u16 *)mask_;
+
+ OVS_SET_MASKED(dst[0], src[0], mask[0]);
+ OVS_SET_MASKED(dst[1], src[1], mask[1]);
+ OVS_SET_MASKED(dst[2], src[2], mask[2]);
+}
+
+static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key,
+ const struct ovs_key_ethernet *key,
+ const struct ovs_key_ethernet *mask)
+{
+ int err;
+
+ err = skb_ensure_writable(skb, ETH_HLEN);
+ if (unlikely(err))
+ return err;
+
+ skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
+
+ ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src,
+ mask->eth_src);
+ ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst,
+ mask->eth_dst);
+
+ skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
+
+ ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source);
+ ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest);
+ return 0;
+}
+
+/* pop_eth does not support VLAN packets as this action is never called
+ * for them.
+ */
+static int pop_eth(struct sk_buff *skb, struct sw_flow_key *key)
+{
+ int err;
+
+ err = skb_eth_pop(skb);
+ if (err)
+ return err;
+
+ /* safe right before invalidate_flow_key */
+ key->mac_proto = MAC_PROTO_NONE;
+ invalidate_flow_key(key);
+ return 0;
+}
+
+static int push_eth(struct sk_buff *skb, struct sw_flow_key *key,
+ const struct ovs_action_push_eth *ethh)
+{
+ int err;
+
+ err = skb_eth_push(skb, ethh->addresses.eth_dst,
+ ethh->addresses.eth_src);
+ if (err)
+ return err;
+
+ /* safe right before invalidate_flow_key */
+ key->mac_proto = MAC_PROTO_ETHERNET;
+ invalidate_flow_key(key);
+ return 0;
+}
+
+static int push_nsh(struct sk_buff *skb, struct sw_flow_key *key,
+ const struct nshhdr *nh)
+{
+ int err;
+
+ err = nsh_push(skb, nh);
+ if (err)
+ return err;
+
+ /* safe right before invalidate_flow_key */
+ key->mac_proto = MAC_PROTO_NONE;
+ invalidate_flow_key(key);
+ return 0;
+}
+
+static int pop_nsh(struct sk_buff *skb, struct sw_flow_key *key)
+{
+ int err;
+
+ err = nsh_pop(skb);
+ if (err)
+ return err;
+
+ /* safe right before invalidate_flow_key */
+ if (skb->protocol == htons(ETH_P_TEB))
+ key->mac_proto = MAC_PROTO_ETHERNET;
+ else
+ key->mac_proto = MAC_PROTO_NONE;
+ invalidate_flow_key(key);
+ return 0;
+}
+
+static void update_ip_l4_checksum(struct sk_buff *skb, struct iphdr *nh,
+ __be32 addr, __be32 new_addr)
+{
+ int transport_len = skb->len - skb_transport_offset(skb);
+
+ if (nh->frag_off & htons(IP_OFFSET))
+ return;
+
+ if (nh->protocol == IPPROTO_TCP) {
+ if (likely(transport_len >= sizeof(struct tcphdr)))
+ inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb,
+ addr, new_addr, true);
+ } else if (nh->protocol == IPPROTO_UDP) {
+ if (likely(transport_len >= sizeof(struct udphdr))) {
+ struct udphdr *uh = udp_hdr(skb);
+
+ if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
+ inet_proto_csum_replace4(&uh->check, skb,
+ addr, new_addr, true);
+ if (!uh->check)
+ uh->check = CSUM_MANGLED_0;
+ }
+ }
+ }
+}
+
+static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
+ __be32 *addr, __be32 new_addr)
+{
+ update_ip_l4_checksum(skb, nh, *addr, new_addr);
+ csum_replace4(&nh->check, *addr, new_addr);
+ skb_clear_hash(skb);
+ ovs_ct_clear(skb, NULL);
+ *addr = new_addr;
+}
+
+static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto,
+ __be32 addr[4], const __be32 new_addr[4])
+{
+ int transport_len = skb->len - skb_transport_offset(skb);
+
+ if (l4_proto == NEXTHDR_TCP) {
+ if (likely(transport_len >= sizeof(struct tcphdr)))
+ inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb,
+ addr, new_addr, true);
+ } else if (l4_proto == NEXTHDR_UDP) {
+ if (likely(transport_len >= sizeof(struct udphdr))) {
+ struct udphdr *uh = udp_hdr(skb);
+
+ if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
+ inet_proto_csum_replace16(&uh->check, skb,
+ addr, new_addr, true);
+ if (!uh->check)
+ uh->check = CSUM_MANGLED_0;
+ }
+ }
+ } else if (l4_proto == NEXTHDR_ICMP) {
+ if (likely(transport_len >= sizeof(struct icmp6hdr)))
+ inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum,
+ skb, addr, new_addr, true);
+ }
+}
+
+static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4],
+ const __be32 mask[4], __be32 masked[4])
+{
+ masked[0] = OVS_MASKED(old[0], addr[0], mask[0]);
+ masked[1] = OVS_MASKED(old[1], addr[1], mask[1]);
+ masked[2] = OVS_MASKED(old[2], addr[2], mask[2]);
+ masked[3] = OVS_MASKED(old[3], addr[3], mask[3]);
+}
+
+static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto,
+ __be32 addr[4], const __be32 new_addr[4],
+ bool recalculate_csum)
+{
+ if (recalculate_csum)
+ update_ipv6_checksum(skb, l4_proto, addr, new_addr);
+
+ skb_clear_hash(skb);
+ ovs_ct_clear(skb, NULL);
+ memcpy(addr, new_addr, sizeof(__be32[4]));
+}
+
+static void set_ipv6_dsfield(struct sk_buff *skb, struct ipv6hdr *nh, u8 ipv6_tclass, u8 mask)
+{
+ u8 old_ipv6_tclass = ipv6_get_dsfield(nh);
+
+ ipv6_tclass = OVS_MASKED(old_ipv6_tclass, ipv6_tclass, mask);
+
+ if (skb->ip_summed == CHECKSUM_COMPLETE)
+ csum_replace(&skb->csum, (__force __wsum)(old_ipv6_tclass << 12),
+ (__force __wsum)(ipv6_tclass << 12));
+
+ ipv6_change_dsfield(nh, ~mask, ipv6_tclass);
+}
+
+static void set_ipv6_fl(struct sk_buff *skb, struct ipv6hdr *nh, u32 fl, u32 mask)
+{
+ u32 ofl;
+
+ ofl = nh->flow_lbl[0] << 16 | nh->flow_lbl[1] << 8 | nh->flow_lbl[2];
+ fl = OVS_MASKED(ofl, fl, mask);
+
+ /* Bits 21-24 are always unmasked, so this retains their values. */
+ nh->flow_lbl[0] = (u8)(fl >> 16);
+ nh->flow_lbl[1] = (u8)(fl >> 8);
+ nh->flow_lbl[2] = (u8)fl;
+
+ if (skb->ip_summed == CHECKSUM_COMPLETE)
+ csum_replace(&skb->csum, (__force __wsum)htonl(ofl), (__force __wsum)htonl(fl));
+}
+
+static void set_ipv6_ttl(struct sk_buff *skb, struct ipv6hdr *nh, u8 new_ttl, u8 mask)
+{
+ new_ttl = OVS_MASKED(nh->hop_limit, new_ttl, mask);
+
+ if (skb->ip_summed == CHECKSUM_COMPLETE)
+ csum_replace(&skb->csum, (__force __wsum)(nh->hop_limit << 8),
+ (__force __wsum)(new_ttl << 8));
+ nh->hop_limit = new_ttl;
+}
+
+static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl,
+ u8 mask)
+{
+ new_ttl = OVS_MASKED(nh->ttl, new_ttl, mask);
+
+ csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8));
+ nh->ttl = new_ttl;
+}
+
+static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key,
+ const struct ovs_key_ipv4 *key,
+ const struct ovs_key_ipv4 *mask)
+{
+ struct iphdr *nh;
+ __be32 new_addr;
+ int err;
+
+ err = skb_ensure_writable(skb, skb_network_offset(skb) +
+ sizeof(struct iphdr));
+ if (unlikely(err))
+ return err;
+
+ nh = ip_hdr(skb);
+
+ /* Setting an IP addresses is typically only a side effect of
+ * matching on them in the current userspace implementation, so it
+ * makes sense to check if the value actually changed.
+ */
+ if (mask->ipv4_src) {
+ new_addr = OVS_MASKED(nh->saddr, key->ipv4_src, mask->ipv4_src);
+
+ if (unlikely(new_addr != nh->saddr)) {
+ set_ip_addr(skb, nh, &nh->saddr, new_addr);
+ flow_key->ipv4.addr.src = new_addr;
+ }
+ }
+ if (mask->ipv4_dst) {
+ new_addr = OVS_MASKED(nh->daddr, key->ipv4_dst, mask->ipv4_dst);
+
+ if (unlikely(new_addr != nh->daddr)) {
+ set_ip_addr(skb, nh, &nh->daddr, new_addr);
+ flow_key->ipv4.addr.dst = new_addr;
+ }
+ }
+ if (mask->ipv4_tos) {
+ ipv4_change_dsfield(nh, ~mask->ipv4_tos, key->ipv4_tos);
+ flow_key->ip.tos = nh->tos;
+ }
+ if (mask->ipv4_ttl) {
+ set_ip_ttl(skb, nh, key->ipv4_ttl, mask->ipv4_ttl);
+ flow_key->ip.ttl = nh->ttl;
+ }
+
+ return 0;
+}
+
+static bool is_ipv6_mask_nonzero(const __be32 addr[4])
+{
+ return !!(addr[0] | addr[1] | addr[2] | addr[3]);
+}
+
+static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *flow_key,
+ const struct ovs_key_ipv6 *key,
+ const struct ovs_key_ipv6 *mask)
+{
+ struct ipv6hdr *nh;
+ int err;
+
+ err = skb_ensure_writable(skb, skb_network_offset(skb) +
+ sizeof(struct ipv6hdr));
+ if (unlikely(err))
+ return err;
+
+ nh = ipv6_hdr(skb);
+
+ /* Setting an IP addresses is typically only a side effect of
+ * matching on them in the current userspace implementation, so it
+ * makes sense to check if the value actually changed.
+ */
+ if (is_ipv6_mask_nonzero(mask->ipv6_src)) {
+ __be32 *saddr = (__be32 *)&nh->saddr;
+ __be32 masked[4];
+
+ mask_ipv6_addr(saddr, key->ipv6_src, mask->ipv6_src, masked);
+
+ if (unlikely(memcmp(saddr, masked, sizeof(masked)))) {
+ set_ipv6_addr(skb, flow_key->ip.proto, saddr, masked,
+ true);
+ memcpy(&flow_key->ipv6.addr.src, masked,
+ sizeof(flow_key->ipv6.addr.src));
+ }
+ }
+ if (is_ipv6_mask_nonzero(mask->ipv6_dst)) {
+ unsigned int offset = 0;
+ int flags = IP6_FH_F_SKIP_RH;
+ bool recalc_csum = true;
+ __be32 *daddr = (__be32 *)&nh->daddr;
+ __be32 masked[4];
+
+ mask_ipv6_addr(daddr, key->ipv6_dst, mask->ipv6_dst, masked);
+
+ if (unlikely(memcmp(daddr, masked, sizeof(masked)))) {
+ if (ipv6_ext_hdr(nh->nexthdr))
+ recalc_csum = (ipv6_find_hdr(skb, &offset,
+ NEXTHDR_ROUTING,
+ NULL, &flags)
+ != NEXTHDR_ROUTING);
+
+ set_ipv6_addr(skb, flow_key->ip.proto, daddr, masked,
+ recalc_csum);
+ memcpy(&flow_key->ipv6.addr.dst, masked,
+ sizeof(flow_key->ipv6.addr.dst));
+ }
+ }
+ if (mask->ipv6_tclass) {
+ set_ipv6_dsfield(skb, nh, key->ipv6_tclass, mask->ipv6_tclass);
+ flow_key->ip.tos = ipv6_get_dsfield(nh);
+ }
+ if (mask->ipv6_label) {
+ set_ipv6_fl(skb, nh, ntohl(key->ipv6_label),
+ ntohl(mask->ipv6_label));
+ flow_key->ipv6.label =
+ *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
+ }
+ if (mask->ipv6_hlimit) {
+ set_ipv6_ttl(skb, nh, key->ipv6_hlimit, mask->ipv6_hlimit);
+ flow_key->ip.ttl = nh->hop_limit;
+ }
+ return 0;
+}
+
+static int set_nsh(struct sk_buff *skb, struct sw_flow_key *flow_key,
+ const struct nlattr *a)
+{
+ struct nshhdr *nh;
+ size_t length;
+ int err;
+ u8 flags;
+ u8 ttl;
+ int i;
+
+ struct ovs_key_nsh key;
+ struct ovs_key_nsh mask;
+
+ err = nsh_key_from_nlattr(a, &key, &mask);
+ if (err)
+ return err;
+
+ /* Make sure the NSH base header is there */
+ if (!pskb_may_pull(skb, skb_network_offset(skb) + NSH_BASE_HDR_LEN))
+ return -ENOMEM;
+
+ nh = nsh_hdr(skb);
+ length = nsh_hdr_len(nh);
+
+ /* Make sure the whole NSH header is there */
+ err = skb_ensure_writable(skb, skb_network_offset(skb) +
+ length);
+ if (unlikely(err))
+ return err;
+
+ nh = nsh_hdr(skb);
+ skb_postpull_rcsum(skb, nh, length);
+ flags = nsh_get_flags(nh);
+ flags = OVS_MASKED(flags, key.base.flags, mask.base.flags);
+ flow_key->nsh.base.flags = flags;
+ ttl = nsh_get_ttl(nh);
+ ttl = OVS_MASKED(ttl, key.base.ttl, mask.base.ttl);
+ flow_key->nsh.base.ttl = ttl;
+ nsh_set_flags_and_ttl(nh, flags, ttl);
+ nh->path_hdr = OVS_MASKED(nh->path_hdr, key.base.path_hdr,
+ mask.base.path_hdr);
+ flow_key->nsh.base.path_hdr = nh->path_hdr;
+ switch (nh->mdtype) {
+ case NSH_M_TYPE1:
+ for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++) {
+ nh->md1.context[i] =
+ OVS_MASKED(nh->md1.context[i], key.context[i],
+ mask.context[i]);
+ }
+ memcpy(flow_key->nsh.context, nh->md1.context,
+ sizeof(nh->md1.context));
+ break;
+ case NSH_M_TYPE2:
+ memset(flow_key->nsh.context, 0,
+ sizeof(flow_key->nsh.context));
+ break;
+ default:
+ return -EINVAL;
+ }
+ skb_postpush_rcsum(skb, nh, length);
+ return 0;
+}
+
+/* Must follow skb_ensure_writable() since that can move the skb data. */
+static void set_tp_port(struct sk_buff *skb, __be16 *port,
+ __be16 new_port, __sum16 *check)
+{
+ ovs_ct_clear(skb, NULL);
+ inet_proto_csum_replace2(check, skb, *port, new_port, false);
+ *port = new_port;
+}
+
+static int set_udp(struct sk_buff *skb, struct sw_flow_key *flow_key,
+ const struct ovs_key_udp *key,
+ const struct ovs_key_udp *mask)
+{
+ struct udphdr *uh;
+ __be16 src, dst;
+ int err;
+
+ err = skb_ensure_writable(skb, skb_transport_offset(skb) +
+ sizeof(struct udphdr));
+ if (unlikely(err))
+ return err;
+
+ uh = udp_hdr(skb);
+ /* Either of the masks is non-zero, so do not bother checking them. */
+ src = OVS_MASKED(uh->source, key->udp_src, mask->udp_src);
+ dst = OVS_MASKED(uh->dest, key->udp_dst, mask->udp_dst);
+
+ if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) {
+ if (likely(src != uh->source)) {
+ set_tp_port(skb, &uh->source, src, &uh->check);
+ flow_key->tp.src = src;
+ }
+ if (likely(dst != uh->dest)) {
+ set_tp_port(skb, &uh->dest, dst, &uh->check);
+ flow_key->tp.dst = dst;
+ }
+
+ if (unlikely(!uh->check))
+ uh->check = CSUM_MANGLED_0;
+ } else {
+ uh->source = src;
+ uh->dest = dst;
+ flow_key->tp.src = src;
+ flow_key->tp.dst = dst;
+ ovs_ct_clear(skb, NULL);
+ }
+
+ skb_clear_hash(skb);
+
+ return 0;
+}
+
+static int set_tcp(struct sk_buff *skb, struct sw_flow_key *flow_key,
+ const struct ovs_key_tcp *key,
+ const struct ovs_key_tcp *mask)
+{
+ struct tcphdr *th;
+ __be16 src, dst;
+ int err;
+
+ err = skb_ensure_writable(skb, skb_transport_offset(skb) +
+ sizeof(struct tcphdr));
+ if (unlikely(err))
+ return err;
+
+ th = tcp_hdr(skb);
+ src = OVS_MASKED(th->source, key->tcp_src, mask->tcp_src);
+ if (likely(src != th->source)) {
+ set_tp_port(skb, &th->source, src, &th->check);
+ flow_key->tp.src = src;
+ }
+ dst = OVS_MASKED(th->dest, key->tcp_dst, mask->tcp_dst);
+ if (likely(dst != th->dest)) {
+ set_tp_port(skb, &th->dest, dst, &th->check);
+ flow_key->tp.dst = dst;
+ }
+ skb_clear_hash(skb);
+
+ return 0;
+}
+
+static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key,
+ const struct ovs_key_sctp *key,
+ const struct ovs_key_sctp *mask)
+{
+ unsigned int sctphoff = skb_transport_offset(skb);
+ struct sctphdr *sh;
+ __le32 old_correct_csum, new_csum, old_csum;
+ int err;
+
+ err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr));
+ if (unlikely(err))
+ return err;
+
+ sh = sctp_hdr(skb);
+ old_csum = sh->checksum;
+ old_correct_csum = sctp_compute_cksum(skb, sctphoff);
+
+ sh->source = OVS_MASKED(sh->source, key->sctp_src, mask->sctp_src);
+ sh->dest = OVS_MASKED(sh->dest, key->sctp_dst, mask->sctp_dst);
+
+ new_csum = sctp_compute_cksum(skb, sctphoff);
+
+ /* Carry any checksum errors through. */
+ sh->checksum = old_csum ^ old_correct_csum ^ new_csum;
+
+ skb_clear_hash(skb);
+ ovs_ct_clear(skb, NULL);
+
+ flow_key->tp.src = sh->source;
+ flow_key->tp.dst = sh->dest;
+
+ return 0;
+}
+
+static int ovs_vport_output(struct net *net, struct sock *sk,
+ struct sk_buff *skb)
+{
+ struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage);
+ struct vport *vport = data->vport;
+
+ if (skb_cow_head(skb, data->l2_len) < 0) {
+ kfree_skb(skb);
+ return -ENOMEM;
+ }
+
+ __skb_dst_copy(skb, data->dst);
+ *OVS_CB(skb) = data->cb;
+ skb->inner_protocol = data->inner_protocol;
+ if (data->vlan_tci & VLAN_CFI_MASK)
+ __vlan_hwaccel_put_tag(skb, data->vlan_proto, data->vlan_tci & ~VLAN_CFI_MASK);
+ else
+ __vlan_hwaccel_clear_tag(skb);
+
+ /* Reconstruct the MAC header. */
+ skb_push(skb, data->l2_len);
+ memcpy(skb->data, &data->l2_data, data->l2_len);
+ skb_postpush_rcsum(skb, skb->data, data->l2_len);
+ skb_reset_mac_header(skb);
+
+ if (eth_p_mpls(skb->protocol)) {
+ skb->inner_network_header = skb->network_header;
+ skb_set_network_header(skb, data->network_offset);
+ skb_reset_mac_len(skb);
+ }
+
+ ovs_vport_send(vport, skb, data->mac_proto);
+ return 0;
+}
+
+static unsigned int
+ovs_dst_get_mtu(const struct dst_entry *dst)
+{
+ return dst->dev->mtu;
+}
+
+static struct dst_ops ovs_dst_ops = {
+ .family = AF_UNSPEC,
+ .mtu = ovs_dst_get_mtu,
+};
+
+/* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is
+ * ovs_vport_output(), which is called once per fragmented packet.
+ */
+static void prepare_frag(struct vport *vport, struct sk_buff *skb,
+ u16 orig_network_offset, u8 mac_proto)
+{
+ unsigned int hlen = skb_network_offset(skb);
+ struct ovs_frag_data *data;
+
+ data = this_cpu_ptr(&ovs_frag_data_storage);
+ data->dst = skb->_skb_refdst;
+ data->vport = vport;
+ data->cb = *OVS_CB(skb);
+ data->inner_protocol = skb->inner_protocol;
+ data->network_offset = orig_network_offset;
+ if (skb_vlan_tag_present(skb))
+ data->vlan_tci = skb_vlan_tag_get(skb) | VLAN_CFI_MASK;
+ else
+ data->vlan_tci = 0;
+ data->vlan_proto = skb->vlan_proto;
+ data->mac_proto = mac_proto;
+ data->l2_len = hlen;
+ memcpy(&data->l2_data, skb->data, hlen);
+
+ memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
+ skb_pull(skb, hlen);
+}
+
+static void ovs_fragment(struct net *net, struct vport *vport,
+ struct sk_buff *skb, u16 mru,
+ struct sw_flow_key *key)
+{
+ u16 orig_network_offset = 0;
+
+ if (eth_p_mpls(skb->protocol)) {
+ orig_network_offset = skb_network_offset(skb);
+ skb->network_header = skb->inner_network_header;
+ }
+
+ if (skb_network_offset(skb) > MAX_L2_LEN) {
+ OVS_NLERR(1, "L2 header too long to fragment");
+ goto err;
+ }
+
+ if (key->eth.type == htons(ETH_P_IP)) {
+ struct rtable ovs_rt = { 0 };
+ unsigned long orig_dst;
+
+ prepare_frag(vport, skb, orig_network_offset,
+ ovs_key_mac_proto(key));
+ dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1,
+ DST_OBSOLETE_NONE, DST_NOCOUNT);
+ ovs_rt.dst.dev = vport->dev;
+
+ orig_dst = skb->_skb_refdst;
+ skb_dst_set_noref(skb, &ovs_rt.dst);
+ IPCB(skb)->frag_max_size = mru;
+
+ ip_do_fragment(net, skb->sk, skb, ovs_vport_output);
+ refdst_drop(orig_dst);
+ } else if (key->eth.type == htons(ETH_P_IPV6)) {
+ unsigned long orig_dst;
+ struct rt6_info ovs_rt;
+
+ prepare_frag(vport, skb, orig_network_offset,
+ ovs_key_mac_proto(key));
+ memset(&ovs_rt, 0, sizeof(ovs_rt));
+ dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1,
+ DST_OBSOLETE_NONE, DST_NOCOUNT);
+ ovs_rt.dst.dev = vport->dev;
+
+ orig_dst = skb->_skb_refdst;
+ skb_dst_set_noref(skb, &ovs_rt.dst);
+ IP6CB(skb)->frag_max_size = mru;
+
+ ipv6_stub->ipv6_fragment(net, skb->sk, skb, ovs_vport_output);
+ refdst_drop(orig_dst);
+ } else {
+ WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.",
+ ovs_vport_name(vport), ntohs(key->eth.type), mru,
+ vport->dev->mtu);
+ goto err;
+ }
+
+ return;
+err:
+ kfree_skb(skb);
+}
+
+static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
+ struct sw_flow_key *key)
+{
+ struct vport *vport = ovs_vport_rcu(dp, out_port);
+
+ if (likely(vport && netif_carrier_ok(vport->dev))) {
+ u16 mru = OVS_CB(skb)->mru;
+ u32 cutlen = OVS_CB(skb)->cutlen;
+
+ if (unlikely(cutlen > 0)) {
+ if (skb->len - cutlen > ovs_mac_header_len(key))
+ pskb_trim(skb, skb->len - cutlen);
+ else
+ pskb_trim(skb, ovs_mac_header_len(key));
+ }
+
+ if (likely(!mru ||
+ (skb->len <= mru + vport->dev->hard_header_len))) {
+ ovs_vport_send(vport, skb, ovs_key_mac_proto(key));
+ } else if (mru <= vport->dev->mtu) {
+ struct net *net = read_pnet(&dp->net);
+
+ ovs_fragment(net, vport, skb, mru, key);
+ } else {
+ kfree_skb(skb);
+ }
+ } else {
+ kfree_skb(skb);
+ }
+}
+
+static int output_userspace(struct datapath *dp, struct sk_buff *skb,
+ struct sw_flow_key *key, const struct nlattr *attr,
+ const struct nlattr *actions, int actions_len,
+ uint32_t cutlen)
+{
+ struct dp_upcall_info upcall;
+ const struct nlattr *a;
+ int rem;
+
+ memset(&upcall, 0, sizeof(upcall));
+ upcall.cmd = OVS_PACKET_CMD_ACTION;
+ upcall.mru = OVS_CB(skb)->mru;
+
+ for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
+ a = nla_next(a, &rem)) {
+ switch (nla_type(a)) {
+ case OVS_USERSPACE_ATTR_USERDATA:
+ upcall.userdata = a;
+ break;
+
+ case OVS_USERSPACE_ATTR_PID:
+ if (dp->user_features &
+ OVS_DP_F_DISPATCH_UPCALL_PER_CPU)
+ upcall.portid =
+ ovs_dp_get_upcall_portid(dp,
+ smp_processor_id());
+ else
+ upcall.portid = nla_get_u32(a);
+ break;
+
+ case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: {
+ /* Get out tunnel info. */
+ struct vport *vport;
+
+ vport = ovs_vport_rcu(dp, nla_get_u32(a));
+ if (vport) {
+ int err;
+
+ err = dev_fill_metadata_dst(vport->dev, skb);
+ if (!err)
+ upcall.egress_tun_info = skb_tunnel_info(skb);
+ }
+
+ break;
+ }
+
+ case OVS_USERSPACE_ATTR_ACTIONS: {
+ /* Include actions. */
+ upcall.actions = actions;
+ upcall.actions_len = actions_len;
+ break;
+ }
+
+ } /* End of switch. */
+ }
+
+ return ovs_dp_upcall(dp, skb, key, &upcall, cutlen);
+}
+
+static int dec_ttl_exception_handler(struct datapath *dp, struct sk_buff *skb,
+ struct sw_flow_key *key,
+ const struct nlattr *attr)
+{
+ /* The first attribute is always 'OVS_DEC_TTL_ATTR_ACTION'. */
+ struct nlattr *actions = nla_data(attr);
+
+ if (nla_len(actions))
+ return clone_execute(dp, skb, key, 0, nla_data(actions),
+ nla_len(actions), true, false);
+
+ consume_skb(skb);
+ return 0;
+}
+
+/* When 'last' is true, sample() should always consume the 'skb'.
+ * Otherwise, sample() should keep 'skb' intact regardless what
+ * actions are executed within sample().
+ */
+static int sample(struct datapath *dp, struct sk_buff *skb,
+ struct sw_flow_key *key, const struct nlattr *attr,
+ bool last)
+{
+ struct nlattr *actions;
+ struct nlattr *sample_arg;
+ int rem = nla_len(attr);
+ const struct sample_arg *arg;
+ bool clone_flow_key;
+
+ /* The first action is always 'OVS_SAMPLE_ATTR_ARG'. */
+ sample_arg = nla_data(attr);
+ arg = nla_data(sample_arg);
+ actions = nla_next(sample_arg, &rem);
+
+ if ((arg->probability != U32_MAX) &&
+ (!arg->probability || get_random_u32() > arg->probability)) {
+ if (last)
+ consume_skb(skb);
+ return 0;
+ }
+
+ clone_flow_key = !arg->exec;
+ return clone_execute(dp, skb, key, 0, actions, rem, last,
+ clone_flow_key);
+}
+
+/* When 'last' is true, clone() should always consume the 'skb'.
+ * Otherwise, clone() should keep 'skb' intact regardless what
+ * actions are executed within clone().
+ */
+static int clone(struct datapath *dp, struct sk_buff *skb,
+ struct sw_flow_key *key, const struct nlattr *attr,
+ bool last)
+{
+ struct nlattr *actions;
+ struct nlattr *clone_arg;
+ int rem = nla_len(attr);
+ bool dont_clone_flow_key;
+
+ /* The first action is always 'OVS_CLONE_ATTR_EXEC'. */
+ clone_arg = nla_data(attr);
+ dont_clone_flow_key = nla_get_u32(clone_arg);
+ actions = nla_next(clone_arg, &rem);
+
+ return clone_execute(dp, skb, key, 0, actions, rem, last,
+ !dont_clone_flow_key);
+}
+
+static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key,
+ const struct nlattr *attr)
+{
+ struct ovs_action_hash *hash_act = nla_data(attr);
+ u32 hash = 0;
+
+ /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */
+ hash = skb_get_hash(skb);
+ hash = jhash_1word(hash, hash_act->hash_basis);
+ if (!hash)
+ hash = 0x1;
+
+ key->ovs_flow_hash = hash;
+}
+
+static int execute_set_action(struct sk_buff *skb,
+ struct sw_flow_key *flow_key,
+ const struct nlattr *a)
+{
+ /* Only tunnel set execution is supported without a mask. */
+ if (nla_type(a) == OVS_KEY_ATTR_TUNNEL_INFO) {
+ struct ovs_tunnel_info *tun = nla_data(a);
+
+ skb_dst_drop(skb);
+ dst_hold((struct dst_entry *)tun->tun_dst);
+ skb_dst_set(skb, (struct dst_entry *)tun->tun_dst);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+/* Mask is at the midpoint of the data. */
+#define get_mask(a, type) ((const type)nla_data(a) + 1)
+
+static int execute_masked_set_action(struct sk_buff *skb,
+ struct sw_flow_key *flow_key,
+ const struct nlattr *a)
+{
+ int err = 0;
+
+ switch (nla_type(a)) {
+ case OVS_KEY_ATTR_PRIORITY:
+ OVS_SET_MASKED(skb->priority, nla_get_u32(a),
+ *get_mask(a, u32 *));
+ flow_key->phy.priority = skb->priority;
+ break;
+
+ case OVS_KEY_ATTR_SKB_MARK:
+ OVS_SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *));
+ flow_key->phy.skb_mark = skb->mark;
+ break;
+
+ case OVS_KEY_ATTR_TUNNEL_INFO:
+ /* Masked data not supported for tunnel. */
+ err = -EINVAL;
+ break;
+
+ case OVS_KEY_ATTR_ETHERNET:
+ err = set_eth_addr(skb, flow_key, nla_data(a),
+ get_mask(a, struct ovs_key_ethernet *));
+ break;
+
+ case OVS_KEY_ATTR_NSH:
+ err = set_nsh(skb, flow_key, a);
+ break;
+
+ case OVS_KEY_ATTR_IPV4:
+ err = set_ipv4(skb, flow_key, nla_data(a),
+ get_mask(a, struct ovs_key_ipv4 *));
+ break;
+
+ case OVS_KEY_ATTR_IPV6:
+ err = set_ipv6(skb, flow_key, nla_data(a),
+ get_mask(a, struct ovs_key_ipv6 *));
+ break;
+
+ case OVS_KEY_ATTR_TCP:
+ err = set_tcp(skb, flow_key, nla_data(a),
+ get_mask(a, struct ovs_key_tcp *));
+ break;
+
+ case OVS_KEY_ATTR_UDP:
+ err = set_udp(skb, flow_key, nla_data(a),
+ get_mask(a, struct ovs_key_udp *));
+ break;
+
+ case OVS_KEY_ATTR_SCTP:
+ err = set_sctp(skb, flow_key, nla_data(a),
+ get_mask(a, struct ovs_key_sctp *));
+ break;
+
+ case OVS_KEY_ATTR_MPLS:
+ err = set_mpls(skb, flow_key, nla_data(a), get_mask(a,
+ __be32 *));
+ break;
+
+ case OVS_KEY_ATTR_CT_STATE:
+ case OVS_KEY_ATTR_CT_ZONE:
+ case OVS_KEY_ATTR_CT_MARK:
+ case OVS_KEY_ATTR_CT_LABELS:
+ case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4:
+ case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6:
+ err = -EINVAL;
+ break;
+ }
+
+ return err;
+}
+
+static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
+ struct sw_flow_key *key,
+ const struct nlattr *a, bool last)
+{
+ u32 recirc_id;
+
+ if (!is_flow_key_valid(key)) {
+ int err;
+
+ err = ovs_flow_key_update(skb, key);
+ if (err)
+ return err;
+ }
+ BUG_ON(!is_flow_key_valid(key));
+
+ recirc_id = nla_get_u32(a);
+ return clone_execute(dp, skb, key, recirc_id, NULL, 0, last, true);
+}
+
+static int execute_check_pkt_len(struct datapath *dp, struct sk_buff *skb,
+ struct sw_flow_key *key,
+ const struct nlattr *attr, bool last)
+{
+ struct ovs_skb_cb *ovs_cb = OVS_CB(skb);
+ const struct nlattr *actions, *cpl_arg;
+ int len, max_len, rem = nla_len(attr);
+ const struct check_pkt_len_arg *arg;
+ bool clone_flow_key;
+
+ /* The first netlink attribute in 'attr' is always
+ * 'OVS_CHECK_PKT_LEN_ATTR_ARG'.
+ */
+ cpl_arg = nla_data(attr);
+ arg = nla_data(cpl_arg);
+
+ len = ovs_cb->mru ? ovs_cb->mru + skb->mac_len : skb->len;
+ max_len = arg->pkt_len;
+
+ if ((skb_is_gso(skb) && skb_gso_validate_mac_len(skb, max_len)) ||
+ len <= max_len) {
+ /* Second netlink attribute in 'attr' is always
+ * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'.
+ */
+ actions = nla_next(cpl_arg, &rem);
+ clone_flow_key = !arg->exec_for_lesser_equal;
+ } else {
+ /* Third netlink attribute in 'attr' is always
+ * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER'.
+ */
+ actions = nla_next(cpl_arg, &rem);
+ actions = nla_next(actions, &rem);
+ clone_flow_key = !arg->exec_for_greater;
+ }
+
+ return clone_execute(dp, skb, key, 0, nla_data(actions),
+ nla_len(actions), last, clone_flow_key);
+}
+
+static int execute_dec_ttl(struct sk_buff *skb, struct sw_flow_key *key)
+{
+ int err;
+
+ if (skb->protocol == htons(ETH_P_IPV6)) {
+ struct ipv6hdr *nh;
+
+ err = skb_ensure_writable(skb, skb_network_offset(skb) +
+ sizeof(*nh));
+ if (unlikely(err))
+ return err;
+
+ nh = ipv6_hdr(skb);
+
+ if (nh->hop_limit <= 1)
+ return -EHOSTUNREACH;
+
+ key->ip.ttl = --nh->hop_limit;
+ } else if (skb->protocol == htons(ETH_P_IP)) {
+ struct iphdr *nh;
+ u8 old_ttl;
+
+ err = skb_ensure_writable(skb, skb_network_offset(skb) +
+ sizeof(*nh));
+ if (unlikely(err))
+ return err;
+
+ nh = ip_hdr(skb);
+ if (nh->ttl <= 1)
+ return -EHOSTUNREACH;
+
+ old_ttl = nh->ttl--;
+ csum_replace2(&nh->check, htons(old_ttl << 8),
+ htons(nh->ttl << 8));
+ key->ip.ttl = nh->ttl;
+ }
+ return 0;
+}
+
+/* Execute a list of actions against 'skb'. */
+static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
+ struct sw_flow_key *key,
+ const struct nlattr *attr, int len)
+{
+ const struct nlattr *a;
+ int rem;
+
+ for (a = attr, rem = len; rem > 0;
+ a = nla_next(a, &rem)) {
+ int err = 0;
+
+ if (trace_ovs_do_execute_action_enabled())
+ trace_ovs_do_execute_action(dp, skb, key, a, rem);
+
+ switch (nla_type(a)) {
+ case OVS_ACTION_ATTR_OUTPUT: {
+ int port = nla_get_u32(a);
+ struct sk_buff *clone;
+
+ /* Every output action needs a separate clone
+ * of 'skb', In case the output action is the
+ * last action, cloning can be avoided.
+ */
+ if (nla_is_last(a, rem)) {
+ do_output(dp, skb, port, key);
+ /* 'skb' has been used for output.
+ */
+ return 0;
+ }
+
+ clone = skb_clone(skb, GFP_ATOMIC);
+ if (clone)
+ do_output(dp, clone, port, key);
+ OVS_CB(skb)->cutlen = 0;
+ break;
+ }
+
+ case OVS_ACTION_ATTR_TRUNC: {
+ struct ovs_action_trunc *trunc = nla_data(a);
+
+ if (skb->len > trunc->max_len)
+ OVS_CB(skb)->cutlen = skb->len - trunc->max_len;
+ break;
+ }
+
+ case OVS_ACTION_ATTR_USERSPACE:
+ output_userspace(dp, skb, key, a, attr,
+ len, OVS_CB(skb)->cutlen);
+ OVS_CB(skb)->cutlen = 0;
+ break;
+
+ case OVS_ACTION_ATTR_HASH:
+ execute_hash(skb, key, a);
+ break;
+
+ case OVS_ACTION_ATTR_PUSH_MPLS: {
+ struct ovs_action_push_mpls *mpls = nla_data(a);
+
+ err = push_mpls(skb, key, mpls->mpls_lse,
+ mpls->mpls_ethertype, skb->mac_len);
+ break;
+ }
+ case OVS_ACTION_ATTR_ADD_MPLS: {
+ struct ovs_action_add_mpls *mpls = nla_data(a);
+ __u16 mac_len = 0;
+
+ if (mpls->tun_flags & OVS_MPLS_L3_TUNNEL_FLAG_MASK)
+ mac_len = skb->mac_len;
+
+ err = push_mpls(skb, key, mpls->mpls_lse,
+ mpls->mpls_ethertype, mac_len);
+ break;
+ }
+ case OVS_ACTION_ATTR_POP_MPLS:
+ err = pop_mpls(skb, key, nla_get_be16(a));
+ break;
+
+ case OVS_ACTION_ATTR_PUSH_VLAN:
+ err = push_vlan(skb, key, nla_data(a));
+ break;
+
+ case OVS_ACTION_ATTR_POP_VLAN:
+ err = pop_vlan(skb, key);
+ break;
+
+ case OVS_ACTION_ATTR_RECIRC: {
+ bool last = nla_is_last(a, rem);
+
+ err = execute_recirc(dp, skb, key, a, last);
+ if (last) {
+ /* If this is the last action, the skb has
+ * been consumed or freed.
+ * Return immediately.
+ */
+ return err;
+ }
+ break;
+ }
+
+ case OVS_ACTION_ATTR_SET:
+ err = execute_set_action(skb, key, nla_data(a));
+ break;
+
+ case OVS_ACTION_ATTR_SET_MASKED:
+ case OVS_ACTION_ATTR_SET_TO_MASKED:
+ err = execute_masked_set_action(skb, key, nla_data(a));
+ break;
+
+ case OVS_ACTION_ATTR_SAMPLE: {
+ bool last = nla_is_last(a, rem);
+
+ err = sample(dp, skb, key, a, last);
+ if (last)
+ return err;
+
+ break;
+ }
+
+ case OVS_ACTION_ATTR_CT:
+ if (!is_flow_key_valid(key)) {
+ err = ovs_flow_key_update(skb, key);
+ if (err)
+ return err;
+ }
+
+ err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key,
+ nla_data(a));
+
+ /* Hide stolen IP fragments from user space. */
+ if (err)
+ return err == -EINPROGRESS ? 0 : err;
+ break;
+
+ case OVS_ACTION_ATTR_CT_CLEAR:
+ err = ovs_ct_clear(skb, key);
+ break;
+
+ case OVS_ACTION_ATTR_PUSH_ETH:
+ err = push_eth(skb, key, nla_data(a));
+ break;
+
+ case OVS_ACTION_ATTR_POP_ETH:
+ err = pop_eth(skb, key);
+ break;
+
+ case OVS_ACTION_ATTR_PUSH_NSH: {
+ u8 buffer[NSH_HDR_MAX_LEN];
+ struct nshhdr *nh = (struct nshhdr *)buffer;
+
+ err = nsh_hdr_from_nlattr(nla_data(a), nh,
+ NSH_HDR_MAX_LEN);
+ if (unlikely(err))
+ break;
+ err = push_nsh(skb, key, nh);
+ break;
+ }
+
+ case OVS_ACTION_ATTR_POP_NSH:
+ err = pop_nsh(skb, key);
+ break;
+
+ case OVS_ACTION_ATTR_METER:
+ if (ovs_meter_execute(dp, skb, key, nla_get_u32(a))) {
+ consume_skb(skb);
+ return 0;
+ }
+ break;
+
+ case OVS_ACTION_ATTR_CLONE: {
+ bool last = nla_is_last(a, rem);
+
+ err = clone(dp, skb, key, a, last);
+ if (last)
+ return err;
+
+ break;
+ }
+
+ case OVS_ACTION_ATTR_CHECK_PKT_LEN: {
+ bool last = nla_is_last(a, rem);
+
+ err = execute_check_pkt_len(dp, skb, key, a, last);
+ if (last)
+ return err;
+
+ break;
+ }
+
+ case OVS_ACTION_ATTR_DEC_TTL:
+ err = execute_dec_ttl(skb, key);
+ if (err == -EHOSTUNREACH)
+ return dec_ttl_exception_handler(dp, skb,
+ key, a);
+ break;
+ }
+
+ if (unlikely(err)) {
+ kfree_skb(skb);
+ return err;
+ }
+ }
+
+ consume_skb(skb);
+ return 0;
+}
+
+/* Execute the actions on the clone of the packet. The effect of the
+ * execution does not affect the original 'skb' nor the original 'key'.
+ *
+ * The execution may be deferred in case the actions can not be executed
+ * immediately.
+ */
+static int clone_execute(struct datapath *dp, struct sk_buff *skb,
+ struct sw_flow_key *key, u32 recirc_id,
+ const struct nlattr *actions, int len,
+ bool last, bool clone_flow_key)
+{
+ struct deferred_action *da;
+ struct sw_flow_key *clone;
+
+ skb = last ? skb : skb_clone(skb, GFP_ATOMIC);
+ if (!skb) {
+ /* Out of memory, skip this action.
+ */
+ return 0;
+ }
+
+ /* When clone_flow_key is false, the 'key' will not be change
+ * by the actions, then the 'key' can be used directly.
+ * Otherwise, try to clone key from the next recursion level of
+ * 'flow_keys'. If clone is successful, execute the actions
+ * without deferring.
+ */
+ clone = clone_flow_key ? clone_key(key) : key;
+ if (clone) {
+ int err = 0;
+
+ if (actions) { /* Sample action */
+ if (clone_flow_key)
+ __this_cpu_inc(exec_actions_level);
+
+ err = do_execute_actions(dp, skb, clone,
+ actions, len);
+
+ if (clone_flow_key)
+ __this_cpu_dec(exec_actions_level);
+ } else { /* Recirc action */
+ clone->recirc_id = recirc_id;
+ ovs_dp_process_packet(skb, clone);
+ }
+ return err;
+ }
+
+ /* Out of 'flow_keys' space. Defer actions */
+ da = add_deferred_actions(skb, key, actions, len);
+ if (da) {
+ if (!actions) { /* Recirc action */
+ key = &da->pkt_key;
+ key->recirc_id = recirc_id;
+ }
+ } else {
+ /* Out of per CPU action FIFO space. Drop the 'skb' and
+ * log an error.
+ */
+ kfree_skb(skb);
+
+ if (net_ratelimit()) {
+ if (actions) { /* Sample action */
+ pr_warn("%s: deferred action limit reached, drop sample action\n",
+ ovs_dp_name(dp));
+ } else { /* Recirc action */
+ pr_warn("%s: deferred action limit reached, drop recirc action (recirc_id=%#x)\n",
+ ovs_dp_name(dp), recirc_id);
+ }
+ }
+ }
+ return 0;
+}
+
+static void process_deferred_actions(struct datapath *dp)
+{
+ struct action_fifo *fifo = this_cpu_ptr(action_fifos);
+
+ /* Do not touch the FIFO in case there is no deferred actions. */
+ if (action_fifo_is_empty(fifo))
+ return;
+
+ /* Finishing executing all deferred actions. */
+ do {
+ struct deferred_action *da = action_fifo_get(fifo);
+ struct sk_buff *skb = da->skb;
+ struct sw_flow_key *key = &da->pkt_key;
+ const struct nlattr *actions = da->actions;
+ int actions_len = da->actions_len;
+
+ if (actions)
+ do_execute_actions(dp, skb, key, actions, actions_len);
+ else
+ ovs_dp_process_packet(skb, key);
+ } while (!action_fifo_is_empty(fifo));
+
+ /* Reset FIFO for the next packet. */
+ action_fifo_init(fifo);
+}
+
+/* Execute a list of actions against 'skb'. */
+int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
+ const struct sw_flow_actions *acts,
+ struct sw_flow_key *key)
+{
+ int err, level;
+
+ level = __this_cpu_inc_return(exec_actions_level);
+ if (unlikely(level > OVS_RECURSION_LIMIT)) {
+ net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n",
+ ovs_dp_name(dp));
+ kfree_skb(skb);
+ err = -ENETDOWN;
+ goto out;
+ }
+
+ OVS_CB(skb)->acts_origlen = acts->orig_len;
+ err = do_execute_actions(dp, skb, key,
+ acts->actions, acts->actions_len);
+
+ if (level == 1)
+ process_deferred_actions(dp);
+
+out:
+ __this_cpu_dec(exec_actions_level);
+ return err;
+}
+
+int action_fifos_init(void)
+{
+ action_fifos = alloc_percpu(struct action_fifo);
+ if (!action_fifos)
+ return -ENOMEM;
+
+ flow_keys = alloc_percpu(struct action_flow_keys);
+ if (!flow_keys) {
+ free_percpu(action_fifos);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+void action_fifos_exit(void)
+{
+ free_percpu(action_fifos);
+ free_percpu(flow_keys);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 01:25:47 +0000