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synced 2024-08-25 02:09:42 +00:00
![Matteo Croce](/assets/img/avatar_default.png)
New action to decrement TTL instead of setting it to a fixed value. This action will decrement the TTL and, in case of expired TTL, drop it or execute an action passed via a nested attribute. The default TTL expired action is to drop the packet. Supports both IPv4 and IPv6 via the ttl and hop_limit fields, respectively. Tested with a corresponding change in the userspace: # ovs-dpctl dump-flows in_port(2),eth(),eth_type(0x0800), packets:0, bytes:0, used:never, actions:dec_ttl{ttl<=1 action:(drop)},1 in_port(1),eth(),eth_type(0x0800), packets:0, bytes:0, used:never, actions:dec_ttl{ttl<=1 action:(drop)},2 in_port(1),eth(),eth_type(0x0806), packets:0, bytes:0, used:never, actions:2 in_port(2),eth(),eth_type(0x0806), packets:0, bytes:0, used:never, actions:1 # ping -c1 192.168.0.2 -t 42 IP (tos 0x0, ttl 41, id 61647, offset 0, flags [DF], proto ICMP (1), length 84) 192.168.0.1 > 192.168.0.2: ICMP echo request, id 386, seq 1, length 64 # ping -c1 192.168.0.2 -t 120 IP (tos 0x0, ttl 119, id 62070, offset 0, flags [DF], proto ICMP (1), length 84) 192.168.0.1 > 192.168.0.2: ICMP echo request, id 388, seq 1, length 64 # ping -c1 192.168.0.2 -t 1 # Co-developed-by: Bindiya Kurle <bindiyakurle@gmail.com> Signed-off-by: Bindiya Kurle <bindiyakurle@gmail.com> Signed-off-by: Matteo Croce <mcroce@redhat.com> Acked-by: Pravin B Shelar <pshelar@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net>
1593 lines
39 KiB
C
1593 lines
39 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2007-2017 Nicira, Inc.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/skbuff.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/openvswitch.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/sctp.h>
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <linux/in6.h>
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#include <linux/if_arp.h>
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#include <linux/if_vlan.h>
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#include <net/dst.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/ip6_fib.h>
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#include <net/checksum.h>
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#include <net/dsfield.h>
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#include <net/mpls.h>
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#include <net/sctp/checksum.h>
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#include "datapath.h"
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#include "flow.h"
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#include "conntrack.h"
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#include "vport.h"
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#include "flow_netlink.h"
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struct deferred_action {
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struct sk_buff *skb;
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const struct nlattr *actions;
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int actions_len;
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/* Store pkt_key clone when creating deferred action. */
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struct sw_flow_key pkt_key;
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};
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#define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN)
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struct ovs_frag_data {
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unsigned long dst;
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struct vport *vport;
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struct ovs_skb_cb cb;
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__be16 inner_protocol;
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u16 network_offset; /* valid only for MPLS */
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u16 vlan_tci;
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__be16 vlan_proto;
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unsigned int l2_len;
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u8 mac_proto;
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u8 l2_data[MAX_L2_LEN];
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};
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static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage);
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#define DEFERRED_ACTION_FIFO_SIZE 10
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#define OVS_RECURSION_LIMIT 5
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#define OVS_DEFERRED_ACTION_THRESHOLD (OVS_RECURSION_LIMIT - 2)
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struct action_fifo {
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int head;
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int tail;
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/* Deferred action fifo queue storage. */
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struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE];
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};
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struct action_flow_keys {
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struct sw_flow_key key[OVS_DEFERRED_ACTION_THRESHOLD];
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};
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static struct action_fifo __percpu *action_fifos;
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static struct action_flow_keys __percpu *flow_keys;
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static DEFINE_PER_CPU(int, exec_actions_level);
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/* Make a clone of the 'key', using the pre-allocated percpu 'flow_keys'
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* space. Return NULL if out of key spaces.
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*/
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static struct sw_flow_key *clone_key(const struct sw_flow_key *key_)
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{
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struct action_flow_keys *keys = this_cpu_ptr(flow_keys);
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int level = this_cpu_read(exec_actions_level);
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struct sw_flow_key *key = NULL;
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if (level <= OVS_DEFERRED_ACTION_THRESHOLD) {
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key = &keys->key[level - 1];
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*key = *key_;
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}
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return key;
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}
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static void action_fifo_init(struct action_fifo *fifo)
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{
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fifo->head = 0;
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fifo->tail = 0;
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}
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static bool action_fifo_is_empty(const struct action_fifo *fifo)
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{
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return (fifo->head == fifo->tail);
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}
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static struct deferred_action *action_fifo_get(struct action_fifo *fifo)
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{
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if (action_fifo_is_empty(fifo))
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return NULL;
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return &fifo->fifo[fifo->tail++];
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}
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static struct deferred_action *action_fifo_put(struct action_fifo *fifo)
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{
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if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1)
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return NULL;
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return &fifo->fifo[fifo->head++];
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}
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/* Return true if fifo is not full */
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static struct deferred_action *add_deferred_actions(struct sk_buff *skb,
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const struct sw_flow_key *key,
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const struct nlattr *actions,
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const int actions_len)
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{
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struct action_fifo *fifo;
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struct deferred_action *da;
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fifo = this_cpu_ptr(action_fifos);
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da = action_fifo_put(fifo);
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if (da) {
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da->skb = skb;
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da->actions = actions;
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da->actions_len = actions_len;
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da->pkt_key = *key;
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}
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return da;
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}
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static void invalidate_flow_key(struct sw_flow_key *key)
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{
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key->mac_proto |= SW_FLOW_KEY_INVALID;
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}
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static bool is_flow_key_valid(const struct sw_flow_key *key)
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{
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return !(key->mac_proto & SW_FLOW_KEY_INVALID);
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}
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static int clone_execute(struct datapath *dp, struct sk_buff *skb,
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struct sw_flow_key *key,
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u32 recirc_id,
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const struct nlattr *actions, int len,
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bool last, bool clone_flow_key);
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static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
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struct sw_flow_key *key,
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const struct nlattr *attr, int len);
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static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
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__be32 mpls_lse, __be16 mpls_ethertype, __u16 mac_len)
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{
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int err;
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err = skb_mpls_push(skb, mpls_lse, mpls_ethertype, mac_len, !!mac_len);
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if (err)
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return err;
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if (!mac_len)
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key->mac_proto = MAC_PROTO_NONE;
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invalidate_flow_key(key);
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return 0;
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}
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static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
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const __be16 ethertype)
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{
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int err;
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err = skb_mpls_pop(skb, ethertype, skb->mac_len,
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ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET);
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if (err)
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return err;
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if (ethertype == htons(ETH_P_TEB))
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key->mac_proto = MAC_PROTO_ETHERNET;
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invalidate_flow_key(key);
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return 0;
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}
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static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key,
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const __be32 *mpls_lse, const __be32 *mask)
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{
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struct mpls_shim_hdr *stack;
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__be32 lse;
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int err;
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stack = mpls_hdr(skb);
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lse = OVS_MASKED(stack->label_stack_entry, *mpls_lse, *mask);
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err = skb_mpls_update_lse(skb, lse);
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if (err)
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return err;
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flow_key->mpls.lse[0] = lse;
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return 0;
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}
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static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key)
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{
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int err;
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err = skb_vlan_pop(skb);
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if (skb_vlan_tag_present(skb)) {
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invalidate_flow_key(key);
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} else {
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key->eth.vlan.tci = 0;
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key->eth.vlan.tpid = 0;
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}
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return err;
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}
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static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key,
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const struct ovs_action_push_vlan *vlan)
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{
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if (skb_vlan_tag_present(skb)) {
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invalidate_flow_key(key);
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} else {
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key->eth.vlan.tci = vlan->vlan_tci;
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key->eth.vlan.tpid = vlan->vlan_tpid;
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}
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return skb_vlan_push(skb, vlan->vlan_tpid,
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ntohs(vlan->vlan_tci) & ~VLAN_CFI_MASK);
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}
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/* 'src' is already properly masked. */
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static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_)
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{
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u16 *dst = (u16 *)dst_;
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const u16 *src = (const u16 *)src_;
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const u16 *mask = (const u16 *)mask_;
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OVS_SET_MASKED(dst[0], src[0], mask[0]);
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OVS_SET_MASKED(dst[1], src[1], mask[1]);
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OVS_SET_MASKED(dst[2], src[2], mask[2]);
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}
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static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key,
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const struct ovs_key_ethernet *key,
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const struct ovs_key_ethernet *mask)
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{
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int err;
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err = skb_ensure_writable(skb, ETH_HLEN);
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if (unlikely(err))
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return err;
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skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
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ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src,
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mask->eth_src);
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ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst,
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mask->eth_dst);
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skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
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ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source);
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ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest);
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return 0;
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}
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/* pop_eth does not support VLAN packets as this action is never called
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* for them.
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*/
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static int pop_eth(struct sk_buff *skb, struct sw_flow_key *key)
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{
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skb_pull_rcsum(skb, ETH_HLEN);
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skb_reset_mac_header(skb);
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skb_reset_mac_len(skb);
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/* safe right before invalidate_flow_key */
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key->mac_proto = MAC_PROTO_NONE;
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invalidate_flow_key(key);
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return 0;
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}
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static int push_eth(struct sk_buff *skb, struct sw_flow_key *key,
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const struct ovs_action_push_eth *ethh)
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{
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struct ethhdr *hdr;
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/* Add the new Ethernet header */
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if (skb_cow_head(skb, ETH_HLEN) < 0)
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return -ENOMEM;
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skb_push(skb, ETH_HLEN);
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skb_reset_mac_header(skb);
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skb_reset_mac_len(skb);
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hdr = eth_hdr(skb);
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ether_addr_copy(hdr->h_source, ethh->addresses.eth_src);
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ether_addr_copy(hdr->h_dest, ethh->addresses.eth_dst);
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hdr->h_proto = skb->protocol;
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skb_postpush_rcsum(skb, hdr, ETH_HLEN);
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/* safe right before invalidate_flow_key */
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key->mac_proto = MAC_PROTO_ETHERNET;
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invalidate_flow_key(key);
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return 0;
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}
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static int push_nsh(struct sk_buff *skb, struct sw_flow_key *key,
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const struct nshhdr *nh)
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{
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int err;
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err = nsh_push(skb, nh);
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if (err)
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return err;
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/* safe right before invalidate_flow_key */
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key->mac_proto = MAC_PROTO_NONE;
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invalidate_flow_key(key);
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return 0;
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}
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static int pop_nsh(struct sk_buff *skb, struct sw_flow_key *key)
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{
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int err;
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err = nsh_pop(skb);
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if (err)
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return err;
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/* safe right before invalidate_flow_key */
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if (skb->protocol == htons(ETH_P_TEB))
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key->mac_proto = MAC_PROTO_ETHERNET;
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else
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key->mac_proto = MAC_PROTO_NONE;
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invalidate_flow_key(key);
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return 0;
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}
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static void update_ip_l4_checksum(struct sk_buff *skb, struct iphdr *nh,
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__be32 addr, __be32 new_addr)
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{
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int transport_len = skb->len - skb_transport_offset(skb);
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if (nh->frag_off & htons(IP_OFFSET))
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return;
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if (nh->protocol == IPPROTO_TCP) {
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if (likely(transport_len >= sizeof(struct tcphdr)))
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inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb,
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addr, new_addr, true);
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} else if (nh->protocol == IPPROTO_UDP) {
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if (likely(transport_len >= sizeof(struct udphdr))) {
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struct udphdr *uh = udp_hdr(skb);
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if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
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inet_proto_csum_replace4(&uh->check, skb,
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addr, new_addr, true);
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if (!uh->check)
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uh->check = CSUM_MANGLED_0;
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}
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}
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}
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}
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static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
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__be32 *addr, __be32 new_addr)
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{
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update_ip_l4_checksum(skb, nh, *addr, new_addr);
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csum_replace4(&nh->check, *addr, new_addr);
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skb_clear_hash(skb);
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*addr = new_addr;
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}
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static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto,
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__be32 addr[4], const __be32 new_addr[4])
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{
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int transport_len = skb->len - skb_transport_offset(skb);
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if (l4_proto == NEXTHDR_TCP) {
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if (likely(transport_len >= sizeof(struct tcphdr)))
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inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb,
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addr, new_addr, true);
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} else if (l4_proto == NEXTHDR_UDP) {
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if (likely(transport_len >= sizeof(struct udphdr))) {
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struct udphdr *uh = udp_hdr(skb);
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if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
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inet_proto_csum_replace16(&uh->check, skb,
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addr, new_addr, true);
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if (!uh->check)
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uh->check = CSUM_MANGLED_0;
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}
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}
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} else if (l4_proto == NEXTHDR_ICMP) {
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if (likely(transport_len >= sizeof(struct icmp6hdr)))
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inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum,
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skb, addr, new_addr, true);
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}
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}
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static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4],
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const __be32 mask[4], __be32 masked[4])
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{
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masked[0] = OVS_MASKED(old[0], addr[0], mask[0]);
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masked[1] = OVS_MASKED(old[1], addr[1], mask[1]);
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masked[2] = OVS_MASKED(old[2], addr[2], mask[2]);
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masked[3] = OVS_MASKED(old[3], addr[3], mask[3]);
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}
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static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto,
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__be32 addr[4], const __be32 new_addr[4],
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bool recalculate_csum)
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{
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if (recalculate_csum)
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update_ipv6_checksum(skb, l4_proto, addr, new_addr);
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skb_clear_hash(skb);
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memcpy(addr, new_addr, sizeof(__be32[4]));
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}
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static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl, u32 mask)
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{
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/* Bits 21-24 are always unmasked, so this retains their values. */
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OVS_SET_MASKED(nh->flow_lbl[0], (u8)(fl >> 16), (u8)(mask >> 16));
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OVS_SET_MASKED(nh->flow_lbl[1], (u8)(fl >> 8), (u8)(mask >> 8));
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OVS_SET_MASKED(nh->flow_lbl[2], (u8)fl, (u8)mask);
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}
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static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl,
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u8 mask)
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{
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new_ttl = OVS_MASKED(nh->ttl, new_ttl, mask);
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csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8));
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nh->ttl = new_ttl;
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}
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static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key,
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const struct ovs_key_ipv4 *key,
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const struct ovs_key_ipv4 *mask)
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{
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struct iphdr *nh;
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__be32 new_addr;
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int err;
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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) {
|
|
ipv6_change_dsfield(nh, ~mask->ipv6_tclass, key->ipv6_tclass);
|
|
flow_key->ip.tos = ipv6_get_dsfield(nh);
|
|
}
|
|
if (mask->ipv6_label) {
|
|
set_ipv6_fl(nh, ntohl(key->ipv6_label),
|
|
ntohl(mask->ipv6_label));
|
|
flow_key->ipv6.label =
|
|
*(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
|
|
}
|
|
if (mask->ipv6_hlimit) {
|
|
OVS_SET_MASKED(nh->hop_limit, 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)
|
|
{
|
|
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;
|
|
}
|
|
|
|
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);
|
|
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 dst_entry ovs_dst;
|
|
unsigned long orig_dst;
|
|
|
|
prepare_frag(vport, skb, orig_network_offset,
|
|
ovs_key_mac_proto(key));
|
|
dst_init(&ovs_dst, &ovs_dst_ops, NULL, 1,
|
|
DST_OBSOLETE_NONE, DST_NOCOUNT);
|
|
ovs_dst.dev = vport->dev;
|
|
|
|
orig_dst = skb->_skb_refdst;
|
|
skb_dst_set_noref(skb, &ovs_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)) {
|
|
const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops();
|
|
unsigned long orig_dst;
|
|
struct rt6_info ovs_rt;
|
|
|
|
if (!v6ops)
|
|
goto err;
|
|
|
|
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;
|
|
|
|
v6ops->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)) {
|
|
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:
|
|
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, bool last)
|
|
{
|
|
/* The first action is always 'OVS_DEC_TTL_ATTR_ARG'. */
|
|
struct nlattr *dec_ttl_arg = nla_data(attr);
|
|
int rem = nla_len(attr);
|
|
|
|
if (nla_len(dec_ttl_arg)) {
|
|
struct nlattr *actions = nla_next(dec_ttl_arg, &rem);
|
|
|
|
if (actions)
|
|
return clone_execute(dp, skb, key, 0, actions, rem,
|
|
last, 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 || prandom_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_ARG'. */
|
|
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)
|
|
{
|
|
const struct nlattr *actions, *cpl_arg;
|
|
const struct check_pkt_len_arg *arg;
|
|
int rem = nla_len(attr);
|
|
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);
|
|
|
|
if (skb->len <= arg->pkt_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 {
|
|
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;
|
|
|
|
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) {
|
|
err = dec_ttl_exception_handler(dp, skb, key,
|
|
a, true);
|
|
return err;
|
|
}
|
|
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\n",
|
|
ovs_dp_name(dp));
|
|
}
|
|
}
|
|
}
|
|
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);
|
|
}
|