1459143386
Conflicts: drivers/net/ieee802154/fakehard.c A bug fix went into 'net' for ieee802154/fakehard.c, which is removed in 'net-next'. Add build fix into the merge from Stephen Rothwell in openvswitch, the logging macros take a new initial 'log' argument, a new call was added in 'net' so when we merge that in here we have to explicitly add the new 'log' arg to it else the build fails. Signed-off-by: David S. Miller <davem@davemloft.net>
898 lines
21 KiB
C
898 lines
21 KiB
C
/*
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* Copyright (c) 2007-2014 Nicira, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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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/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/ip.h>
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#include <net/ipv6.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 "vport.h"
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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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struct deferred_action {
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struct sk_buff *skb;
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const struct nlattr *actions;
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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 DEFERRED_ACTION_FIFO_SIZE 10
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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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static struct action_fifo __percpu *action_fifos;
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static DEFINE_PER_CPU(int, exec_actions_level);
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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 *attr)
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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 = attr;
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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->eth.type = htons(0);
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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->eth.type;
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}
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static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
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const struct ovs_action_push_mpls *mpls)
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{
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__be32 *new_mpls_lse;
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struct ethhdr *hdr;
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/* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */
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if (skb->encapsulation)
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return -ENOTSUPP;
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if (skb_cow_head(skb, MPLS_HLEN) < 0)
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return -ENOMEM;
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skb_push(skb, MPLS_HLEN);
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memmove(skb_mac_header(skb) - MPLS_HLEN, skb_mac_header(skb),
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skb->mac_len);
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skb_reset_mac_header(skb);
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new_mpls_lse = (__be32 *)skb_mpls_header(skb);
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*new_mpls_lse = mpls->mpls_lse;
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if (skb->ip_summed == CHECKSUM_COMPLETE)
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skb->csum = csum_add(skb->csum, csum_partial(new_mpls_lse,
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MPLS_HLEN, 0));
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hdr = eth_hdr(skb);
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hdr->h_proto = mpls->mpls_ethertype;
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skb_set_inner_protocol(skb, skb->protocol);
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skb->protocol = mpls->mpls_ethertype;
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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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struct ethhdr *hdr;
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int err;
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err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN);
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if (unlikely(err))
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return err;
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skb_postpull_rcsum(skb, skb_mpls_header(skb), MPLS_HLEN);
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memmove(skb_mac_header(skb) + MPLS_HLEN, skb_mac_header(skb),
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skb->mac_len);
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__skb_pull(skb, MPLS_HLEN);
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skb_reset_mac_header(skb);
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/* skb_mpls_header() is used to locate the ethertype
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* field correctly in the presence of VLAN tags.
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*/
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hdr = (struct ethhdr *)(skb_mpls_header(skb) - ETH_HLEN);
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hdr->h_proto = ethertype;
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if (eth_p_mpls(skb->protocol))
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skb->protocol = ethertype;
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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 *key,
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const __be32 *mpls_lse)
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{
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__be32 *stack;
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int err;
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err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN);
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if (unlikely(err))
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return err;
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stack = (__be32 *)skb_mpls_header(skb);
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if (skb->ip_summed == CHECKSUM_COMPLETE) {
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__be32 diff[] = { ~(*stack), *mpls_lse };
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skb->csum = ~csum_partial((char *)diff, sizeof(diff),
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~skb->csum);
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}
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*stack = *mpls_lse;
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key->mpls.top_lse = *mpls_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 (vlan_tx_tag_present(skb))
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invalidate_flow_key(key);
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else
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key->eth.tci = 0;
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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 (vlan_tx_tag_present(skb))
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invalidate_flow_key(key);
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else
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key->eth.tci = vlan->vlan_tci;
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return skb_vlan_push(skb, vlan->vlan_tpid,
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ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT);
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}
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static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *key,
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const struct ovs_key_ethernet *eth_key)
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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(eth_hdr(skb)->h_source, eth_key->eth_src);
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ether_addr_copy(eth_hdr(skb)->h_dest, eth_key->eth_dst);
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ovs_skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
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ether_addr_copy(key->eth.src, eth_key->eth_src);
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ether_addr_copy(key->eth.dst, eth_key->eth_dst);
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return 0;
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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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int transport_len = skb->len - skb_transport_offset(skb);
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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, 1);
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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, 1);
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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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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, 1);
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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, 1);
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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, 1);
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}
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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_tc(struct ipv6hdr *nh, u8 tc)
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{
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nh->priority = tc >> 4;
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nh->flow_lbl[0] = (nh->flow_lbl[0] & 0x0F) | ((tc & 0x0F) << 4);
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}
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static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl)
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{
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nh->flow_lbl[0] = (nh->flow_lbl[0] & 0xF0) | (fl & 0x000F0000) >> 16;
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nh->flow_lbl[1] = (fl & 0x0000FF00) >> 8;
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nh->flow_lbl[2] = fl & 0x000000FF;
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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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{
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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 *key,
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const struct ovs_key_ipv4 *ipv4_key)
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{
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struct iphdr *nh;
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int err;
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err = skb_ensure_writable(skb, skb_network_offset(skb) +
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sizeof(struct iphdr));
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if (unlikely(err))
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return err;
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nh = ip_hdr(skb);
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if (ipv4_key->ipv4_src != nh->saddr) {
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set_ip_addr(skb, nh, &nh->saddr, ipv4_key->ipv4_src);
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key->ipv4.addr.src = ipv4_key->ipv4_src;
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}
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if (ipv4_key->ipv4_dst != nh->daddr) {
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set_ip_addr(skb, nh, &nh->daddr, ipv4_key->ipv4_dst);
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key->ipv4.addr.dst = ipv4_key->ipv4_dst;
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}
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if (ipv4_key->ipv4_tos != nh->tos) {
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ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos);
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key->ip.tos = nh->tos;
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}
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if (ipv4_key->ipv4_ttl != nh->ttl) {
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set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl);
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key->ip.ttl = ipv4_key->ipv4_ttl;
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}
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return 0;
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}
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static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *key,
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const struct ovs_key_ipv6 *ipv6_key)
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{
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struct ipv6hdr *nh;
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int err;
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__be32 *saddr;
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__be32 *daddr;
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err = skb_ensure_writable(skb, skb_network_offset(skb) +
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sizeof(struct ipv6hdr));
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if (unlikely(err))
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return err;
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nh = ipv6_hdr(skb);
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saddr = (__be32 *)&nh->saddr;
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daddr = (__be32 *)&nh->daddr;
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if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src))) {
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set_ipv6_addr(skb, ipv6_key->ipv6_proto, saddr,
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ipv6_key->ipv6_src, true);
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memcpy(&key->ipv6.addr.src, ipv6_key->ipv6_src,
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sizeof(ipv6_key->ipv6_src));
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}
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if (memcmp(ipv6_key->ipv6_dst, daddr, sizeof(ipv6_key->ipv6_dst))) {
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unsigned int offset = 0;
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int flags = IP6_FH_F_SKIP_RH;
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bool recalc_csum = true;
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if (ipv6_ext_hdr(nh->nexthdr))
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recalc_csum = ipv6_find_hdr(skb, &offset,
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NEXTHDR_ROUTING, NULL,
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&flags) != NEXTHDR_ROUTING;
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set_ipv6_addr(skb, ipv6_key->ipv6_proto, daddr,
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ipv6_key->ipv6_dst, recalc_csum);
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memcpy(&key->ipv6.addr.dst, ipv6_key->ipv6_dst,
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sizeof(ipv6_key->ipv6_dst));
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}
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set_ipv6_tc(nh, ipv6_key->ipv6_tclass);
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key->ip.tos = ipv6_get_dsfield(nh);
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set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label));
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key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
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nh->hop_limit = ipv6_key->ipv6_hlimit;
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key->ip.ttl = ipv6_key->ipv6_hlimit;
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return 0;
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}
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/* Must follow skb_ensure_writable() since that can move the skb data. */
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static void set_tp_port(struct sk_buff *skb, __be16 *port,
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__be16 new_port, __sum16 *check)
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{
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inet_proto_csum_replace2(check, skb, *port, new_port, 0);
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*port = new_port;
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skb_clear_hash(skb);
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}
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static void set_udp_port(struct sk_buff *skb, __be16 *port, __be16 new_port)
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{
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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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set_tp_port(skb, port, new_port, &uh->check);
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if (!uh->check)
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uh->check = CSUM_MANGLED_0;
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} else {
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*port = new_port;
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skb_clear_hash(skb);
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}
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}
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static int set_udp(struct sk_buff *skb, struct sw_flow_key *key,
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const struct ovs_key_udp *udp_port_key)
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{
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struct udphdr *uh;
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int err;
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err = skb_ensure_writable(skb, skb_transport_offset(skb) +
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sizeof(struct udphdr));
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if (unlikely(err))
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return err;
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uh = udp_hdr(skb);
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if (udp_port_key->udp_src != uh->source) {
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set_udp_port(skb, &uh->source, udp_port_key->udp_src);
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key->tp.src = udp_port_key->udp_src;
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}
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if (udp_port_key->udp_dst != uh->dest) {
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set_udp_port(skb, &uh->dest, udp_port_key->udp_dst);
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key->tp.dst = udp_port_key->udp_dst;
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}
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return 0;
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}
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static int set_tcp(struct sk_buff *skb, struct sw_flow_key *key,
|
|
const struct ovs_key_tcp *tcp_port_key)
|
|
{
|
|
struct tcphdr *th;
|
|
int err;
|
|
|
|
err = skb_ensure_writable(skb, skb_transport_offset(skb) +
|
|
sizeof(struct tcphdr));
|
|
if (unlikely(err))
|
|
return err;
|
|
|
|
th = tcp_hdr(skb);
|
|
if (tcp_port_key->tcp_src != th->source) {
|
|
set_tp_port(skb, &th->source, tcp_port_key->tcp_src, &th->check);
|
|
key->tp.src = tcp_port_key->tcp_src;
|
|
}
|
|
|
|
if (tcp_port_key->tcp_dst != th->dest) {
|
|
set_tp_port(skb, &th->dest, tcp_port_key->tcp_dst, &th->check);
|
|
key->tp.dst = tcp_port_key->tcp_dst;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int set_sctp(struct sk_buff *skb, struct sw_flow_key *key,
|
|
const struct ovs_key_sctp *sctp_port_key)
|
|
{
|
|
struct sctphdr *sh;
|
|
int err;
|
|
unsigned int sctphoff = skb_transport_offset(skb);
|
|
|
|
err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr));
|
|
if (unlikely(err))
|
|
return err;
|
|
|
|
sh = sctp_hdr(skb);
|
|
if (sctp_port_key->sctp_src != sh->source ||
|
|
sctp_port_key->sctp_dst != sh->dest) {
|
|
__le32 old_correct_csum, new_csum, old_csum;
|
|
|
|
old_csum = sh->checksum;
|
|
old_correct_csum = sctp_compute_cksum(skb, sctphoff);
|
|
|
|
sh->source = sctp_port_key->sctp_src;
|
|
sh->dest = sctp_port_key->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);
|
|
key->tp.src = sctp_port_key->sctp_src;
|
|
key->tp.dst = sctp_port_key->sctp_dst;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port)
|
|
{
|
|
struct vport *vport = ovs_vport_rcu(dp, out_port);
|
|
|
|
if (likely(vport))
|
|
ovs_vport_send(vport, 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)
|
|
{
|
|
struct ovs_tunnel_info info;
|
|
struct dp_upcall_info upcall;
|
|
const struct nlattr *a;
|
|
int rem;
|
|
|
|
upcall.cmd = OVS_PACKET_CMD_ACTION;
|
|
upcall.userdata = NULL;
|
|
upcall.portid = 0;
|
|
upcall.egress_tun_info = NULL;
|
|
|
|
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 = ovs_vport_get_egress_tun_info(vport, skb,
|
|
&info);
|
|
if (!err)
|
|
upcall.egress_tun_info = &info;
|
|
}
|
|
break;
|
|
}
|
|
|
|
} /* End of switch. */
|
|
}
|
|
|
|
return ovs_dp_upcall(dp, skb, key, &upcall);
|
|
}
|
|
|
|
static int sample(struct datapath *dp, struct sk_buff *skb,
|
|
struct sw_flow_key *key, const struct nlattr *attr)
|
|
{
|
|
const struct nlattr *acts_list = NULL;
|
|
const struct nlattr *a;
|
|
int rem;
|
|
|
|
for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
|
|
a = nla_next(a, &rem)) {
|
|
switch (nla_type(a)) {
|
|
case OVS_SAMPLE_ATTR_PROBABILITY:
|
|
if (prandom_u32() >= nla_get_u32(a))
|
|
return 0;
|
|
break;
|
|
|
|
case OVS_SAMPLE_ATTR_ACTIONS:
|
|
acts_list = a;
|
|
break;
|
|
}
|
|
}
|
|
|
|
rem = nla_len(acts_list);
|
|
a = nla_data(acts_list);
|
|
|
|
/* Actions list is empty, do nothing */
|
|
if (unlikely(!rem))
|
|
return 0;
|
|
|
|
/* The only known usage of sample action is having a single user-space
|
|
* action. Treat this usage as a special case.
|
|
* The output_userspace() should clone the skb to be sent to the
|
|
* user space. This skb will be consumed by its caller.
|
|
*/
|
|
if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE &&
|
|
nla_is_last(a, rem)))
|
|
return output_userspace(dp, skb, key, a);
|
|
|
|
skb = skb_clone(skb, GFP_ATOMIC);
|
|
if (!skb)
|
|
/* Skip the sample action when out of memory. */
|
|
return 0;
|
|
|
|
if (!add_deferred_actions(skb, key, a)) {
|
|
if (net_ratelimit())
|
|
pr_warn("%s: deferred actions limit reached, dropping sample action\n",
|
|
ovs_dp_name(dp));
|
|
|
|
kfree_skb(skb);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
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 *key,
|
|
const struct nlattr *nested_attr)
|
|
{
|
|
int err = 0;
|
|
|
|
switch (nla_type(nested_attr)) {
|
|
case OVS_KEY_ATTR_PRIORITY:
|
|
skb->priority = nla_get_u32(nested_attr);
|
|
key->phy.priority = skb->priority;
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_SKB_MARK:
|
|
skb->mark = nla_get_u32(nested_attr);
|
|
key->phy.skb_mark = skb->mark;
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_TUNNEL_INFO:
|
|
OVS_CB(skb)->egress_tun_info = nla_data(nested_attr);
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_ETHERNET:
|
|
err = set_eth_addr(skb, key, nla_data(nested_attr));
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_IPV4:
|
|
err = set_ipv4(skb, key, nla_data(nested_attr));
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_IPV6:
|
|
err = set_ipv6(skb, key, nla_data(nested_attr));
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_TCP:
|
|
err = set_tcp(skb, key, nla_data(nested_attr));
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_UDP:
|
|
err = set_udp(skb, key, nla_data(nested_attr));
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_SCTP:
|
|
err = set_sctp(skb, key, nla_data(nested_attr));
|
|
break;
|
|
|
|
case OVS_KEY_ATTR_MPLS:
|
|
err = set_mpls(skb, key, nla_data(nested_attr));
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
|
|
struct sw_flow_key *key,
|
|
const struct nlattr *a, int rem)
|
|
{
|
|
struct deferred_action *da;
|
|
|
|
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));
|
|
|
|
if (!nla_is_last(a, rem)) {
|
|
/* Recirc action is the not the last action
|
|
* of the action list, need to clone the skb.
|
|
*/
|
|
skb = skb_clone(skb, GFP_ATOMIC);
|
|
|
|
/* Skip the recirc action when out of memory, but
|
|
* continue on with the rest of the action list.
|
|
*/
|
|
if (!skb)
|
|
return 0;
|
|
}
|
|
|
|
da = add_deferred_actions(skb, key, NULL);
|
|
if (da) {
|
|
da->pkt_key.recirc_id = nla_get_u32(a);
|
|
} else {
|
|
kfree_skb(skb);
|
|
|
|
if (net_ratelimit())
|
|
pr_warn("%s: deferred action limit reached, drop recirc action\n",
|
|
ovs_dp_name(dp));
|
|
}
|
|
|
|
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)
|
|
{
|
|
/* Every output action needs a separate clone of 'skb', but the common
|
|
* case is just a single output action, so that doing a clone and
|
|
* then freeing the original skbuff is wasteful. So the following code
|
|
* is slightly obscure just to avoid that.
|
|
*/
|
|
int prev_port = -1;
|
|
const struct nlattr *a;
|
|
int rem;
|
|
|
|
for (a = attr, rem = len; rem > 0;
|
|
a = nla_next(a, &rem)) {
|
|
int err = 0;
|
|
|
|
if (unlikely(prev_port != -1)) {
|
|
struct sk_buff *out_skb = skb_clone(skb, GFP_ATOMIC);
|
|
|
|
if (out_skb)
|
|
do_output(dp, out_skb, prev_port);
|
|
|
|
prev_port = -1;
|
|
}
|
|
|
|
switch (nla_type(a)) {
|
|
case OVS_ACTION_ATTR_OUTPUT:
|
|
prev_port = nla_get_u32(a);
|
|
break;
|
|
|
|
case OVS_ACTION_ATTR_USERSPACE:
|
|
output_userspace(dp, skb, key, a);
|
|
break;
|
|
|
|
case OVS_ACTION_ATTR_HASH:
|
|
execute_hash(skb, key, a);
|
|
break;
|
|
|
|
case OVS_ACTION_ATTR_PUSH_MPLS:
|
|
err = push_mpls(skb, key, nla_data(a));
|
|
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:
|
|
err = execute_recirc(dp, skb, key, a, rem);
|
|
if (nla_is_last(a, rem)) {
|
|
/* 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_SAMPLE:
|
|
err = sample(dp, skb, key, a);
|
|
break;
|
|
}
|
|
|
|
if (unlikely(err)) {
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
if (prev_port != -1)
|
|
do_output(dp, skb, prev_port);
|
|
else
|
|
consume_skb(skb);
|
|
|
|
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;
|
|
|
|
if (actions)
|
|
do_execute_actions(dp, skb, key, actions,
|
|
nla_len(actions));
|
|
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 level = this_cpu_read(exec_actions_level);
|
|
int err;
|
|
|
|
this_cpu_inc(exec_actions_level);
|
|
OVS_CB(skb)->egress_tun_info = NULL;
|
|
err = do_execute_actions(dp, skb, key,
|
|
acts->actions, acts->actions_len);
|
|
|
|
if (!level)
|
|
process_deferred_actions(dp);
|
|
|
|
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;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void action_fifos_exit(void)
|
|
{
|
|
free_percpu(action_fifos);
|
|
}
|