/*
- * Distributed under the terms of the GNU GPL version 2.
- * Copyright (c) 2007, 2008, 2009, 2010, 2011 Nicira Networks.
+ * Copyright (c) 2007-2012 Nicira Networks.
*
- * Significant portions of this file may be copied from parts of the Linux
- * kernel, by Linus Torvalds and others.
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
*/
-/* Functions for executing flow actions. */
-
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/skbuff.h>
#include <linux/in.h>
#include <linux/ip.h>
+#include <linux/openvswitch.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/in6.h>
#include <linux/if_arp.h>
#include <linux/if_vlan.h>
-#include <net/inet_ecn.h>
#include <net/ip.h>
#include <net/checksum.h>
+#include <net/dsfield.h>
-#include "actions.h"
#include "checksum.h"
#include "datapath.h"
-#include "openvswitch/datapath-protocol.h"
#include "vlan.h"
#include "vport.h"
/* remove VLAN header from packet and update csum accrodingly. */
static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci)
{
- struct ethhdr *eh;
- struct vlan_ethhdr *veth;
+ struct vlan_hdr *vhdr;
int err;
err = make_writable(skb, VLAN_ETH_HLEN);
skb->csum = csum_sub(skb->csum, csum_partial(skb->data
+ ETH_HLEN, VLAN_HLEN, 0));
- veth = (struct vlan_ethhdr *) skb->data;
- *current_tci = veth->h_vlan_TCI;
+ vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN);
+ *current_tci = vhdr->h_vlan_TCI;
memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN);
+ __skb_pull(skb, VLAN_HLEN);
- eh = (struct ethhdr *)__skb_pull(skb, VLAN_HLEN);
-
- skb->protocol = eh->h_proto;
+ vlan_set_encap_proto(skb, vhdr);
skb->mac_header += VLAN_HLEN;
+ skb_reset_mac_len(skb);
return 0;
}
vlan_set_tci(skb, 0);
} else {
if (unlikely(skb->protocol != htons(ETH_P_8021Q) ||
- skb->len < VLAN_ETH_HLEN))
+ skb->len < VLAN_ETH_HLEN))
return 0;
err = __pop_vlan_tci(skb, &tci);
}
/* move next vlan tag to hw accel tag */
if (likely(skb->protocol != htons(ETH_P_8021Q) ||
- skb->len < VLAN_ETH_HLEN))
+ skb->len < VLAN_ETH_HLEN))
return 0;
err = __pop_vlan_tci(skb, &tci);
return 0;
}
-static int push_vlan(struct sk_buff *skb, __be16 new_tci)
+static int push_vlan(struct sk_buff *skb, const struct ovs_action_push_vlan *vlan)
{
if (unlikely(vlan_tx_tag_present(skb))) {
u16 current_tag;
+ ETH_HLEN, VLAN_HLEN, 0));
}
- __vlan_hwaccel_put_tag(skb, ntohs(new_tci));
+ __vlan_hwaccel_put_tag(skb, ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT);
return 0;
}
-static bool is_ip(struct sk_buff *skb)
+static int set_eth_addr(struct sk_buff *skb,
+ const struct ovs_key_ethernet *eth_key)
{
- return (OVS_CB(skb)->flow->key.eth.type == htons(ETH_P_IP) &&
- skb->transport_header > skb->network_header);
+ int err;
+ err = make_writable(skb, ETH_HLEN);
+ if (unlikely(err))
+ return err;
+
+ memcpy(eth_hdr(skb)->h_source, eth_key->eth_src, ETH_ALEN);
+ memcpy(eth_hdr(skb)->h_dest, eth_key->eth_dst, ETH_ALEN);
+
+ return 0;
}
-static __sum16 *get_l4_checksum(struct sk_buff *skb)
+static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
+ __be32 *addr, __be32 new_addr)
{
- u8 nw_proto = OVS_CB(skb)->flow->key.ip.proto;
int transport_len = skb->len - skb_transport_offset(skb);
- if (nw_proto == IPPROTO_TCP) {
+
+ if (nh->protocol == IPPROTO_TCP) {
if (likely(transport_len >= sizeof(struct tcphdr)))
- return &tcp_hdr(skb)->check;
- } else if (nw_proto == IPPROTO_UDP) {
- if (likely(transport_len >= sizeof(struct udphdr)))
- return &udp_hdr(skb)->check;
+ inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb,
+ *addr, new_addr, 1);
+ } else if (nh->protocol == IPPROTO_UDP) {
+ if (likely(transport_len >= sizeof(struct udphdr))) {
+ struct udphdr *uh = udp_hdr(skb);
+
+ if (uh->check ||
+ get_ip_summed(skb) == OVS_CSUM_PARTIAL) {
+ inet_proto_csum_replace4(&uh->check, skb,
+ *addr, new_addr, 1);
+ if (!uh->check)
+ uh->check = CSUM_MANGLED_0;
+ }
+ }
}
- return NULL;
+
+ csum_replace4(&nh->check, *addr, new_addr);
+ skb_clear_rxhash(skb);
+ *addr = new_addr;
}
-static int set_nw_addr(struct sk_buff *skb, const struct nlattr *a)
+static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl)
+{
+ csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8));
+ nh->ttl = new_ttl;
+}
+
+static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key)
{
- __be32 new_nwaddr = nla_get_be32(a);
struct iphdr *nh;
- __sum16 *check;
- __be32 *nwaddr;
int err;
- if (unlikely(!is_ip(skb)))
- return 0;
-
err = make_writable(skb, skb_network_offset(skb) +
sizeof(struct iphdr));
if (unlikely(err))
return err;
nh = ip_hdr(skb);
- nwaddr = nla_type(a) == OVS_ACTION_ATTR_SET_NW_SRC ? &nh->saddr : &nh->daddr;
- check = get_l4_checksum(skb);
- if (likely(check))
- inet_proto_csum_replace4(check, skb, *nwaddr, new_nwaddr, 1);
- csum_replace4(&nh->check, *nwaddr, new_nwaddr);
+ if (ipv4_key->ipv4_src != nh->saddr)
+ set_ip_addr(skb, nh, &nh->saddr, ipv4_key->ipv4_src);
- skb_clear_rxhash(skb);
+ if (ipv4_key->ipv4_dst != nh->daddr)
+ set_ip_addr(skb, nh, &nh->daddr, ipv4_key->ipv4_dst);
+
+ if (ipv4_key->ipv4_tos != nh->tos)
+ ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos);
- *nwaddr = new_nwaddr;
+ if (ipv4_key->ipv4_ttl != nh->ttl)
+ set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl);
return 0;
}
-static int set_nw_tos(struct sk_buff *skb, u8 nw_tos)
+/* Must follow make_writable() since that can move the skb data. */
+static void set_tp_port(struct sk_buff *skb, __be16 *port,
+ __be16 new_port, __sum16 *check)
{
- struct iphdr *nh = ip_hdr(skb);
- u8 old, new;
- int err;
+ inet_proto_csum_replace2(check, skb, *port, new_port, 0);
+ *port = new_port;
+ skb_clear_rxhash(skb);
+}
- if (unlikely(!is_ip(skb)))
- return 0;
+static void set_udp_port(struct sk_buff *skb, __be16 *port, __be16 new_port)
+{
+ struct udphdr *uh = udp_hdr(skb);
- err = make_writable(skb, skb_network_offset(skb) +
- sizeof(struct iphdr));
+ if (uh->check && get_ip_summed(skb) != OVS_CSUM_PARTIAL) {
+ set_tp_port(skb, port, new_port, &uh->check);
+
+ if (!uh->check)
+ uh->check = CSUM_MANGLED_0;
+ } else {
+ *port = new_port;
+ skb_clear_rxhash(skb);
+ }
+}
+
+static int set_udp(struct sk_buff *skb, const struct ovs_key_udp *udp_port_key)
+{
+ struct udphdr *uh;
+ int err;
+
+ err = make_writable(skb, skb_transport_offset(skb) +
+ sizeof(struct udphdr));
if (unlikely(err))
return err;
- /* Set the DSCP bits and preserve the ECN bits. */
- old = nh->tos;
- new = nw_tos | (nh->tos & INET_ECN_MASK);
- csum_replace4(&nh->check, (__force __be32)old,
- (__force __be32)new);
- nh->tos = new;
+ uh = udp_hdr(skb);
+ if (udp_port_key->udp_src != uh->source)
+ set_udp_port(skb, &uh->source, udp_port_key->udp_src);
+
+ if (udp_port_key->udp_dst != uh->dest)
+ set_udp_port(skb, &uh->dest, udp_port_key->udp_dst);
return 0;
}
-static int set_tp_port(struct sk_buff *skb, const struct nlattr *a)
+static int set_tcp(struct sk_buff *skb, const struct ovs_key_tcp *tcp_port_key)
{
- struct udphdr *th;
- __sum16 *check;
- __be16 *port;
+ struct tcphdr *th;
int err;
- if (unlikely(!is_ip(skb)))
- return 0;
-
err = make_writable(skb, skb_transport_offset(skb) +
sizeof(struct tcphdr));
if (unlikely(err))
return err;
- /* Must follow make_writable() since that can move the skb data. */
- check = get_l4_checksum(skb);
- if (unlikely(!check))
- return 0;
+ 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);
- /*
- * Update port and checksum.
- *
- * This is OK because source and destination port numbers are at the
- * same offsets in both UDP and TCP headers, and get_l4_checksum() only
- * supports those protocols.
- */
- th = udp_hdr(skb);
- port = nla_type(a) == OVS_ACTION_ATTR_SET_TP_SRC ? &th->source : &th->dest;
- inet_proto_csum_replace2(check, skb, *port, nla_get_be16(a), 0);
- *port = nla_get_be16(a);
- skb_clear_rxhash(skb);
+ if (tcp_port_key->tcp_dst != th->dest)
+ set_tp_port(skb, &th->dest, tcp_port_key->tcp_dst, &th->check);
return 0;
}
return -ENODEV;
}
- vport_send(vport, skb);
+ ovs_vport_send(vport, skb);
return 0;
}
}
}
- return dp_upcall(dp, skb, &upcall);
+ return ovs_dp_upcall(dp, skb, &upcall);
}
static int sample(struct datapath *dp, struct sk_buff *skb,
nla_len(acts_list), true);
}
+static int execute_set_action(struct sk_buff *skb,
+ 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);
+ break;
+
+ case OVS_KEY_ATTR_TUN_ID:
+ OVS_CB(skb)->tun_id = nla_get_be64(nested_attr);
+ break;
+
+ case OVS_KEY_ATTR_ETHERNET:
+ err = set_eth_addr(skb, nla_data(nested_attr));
+ break;
+
+ case OVS_KEY_ATTR_IPV4:
+ err = set_ipv4(skb, nla_data(nested_attr));
+ break;
+
+ case OVS_KEY_ATTR_TCP:
+ err = set_tcp(skb, nla_data(nested_attr));
+ break;
+
+ case OVS_KEY_ATTR_UDP:
+ err = set_udp(skb, nla_data(nested_attr));
+ break;
+ }
+
+ return err;
+}
+
/* Execute a list of actions against 'skb'. */
static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
const struct nlattr *attr, int len, bool keep_skb)
* then freeing the original skbuff is wasteful. So the following code
* is slightly obscure just to avoid that. */
int prev_port = -1;
- u32 priority = skb->priority;
const struct nlattr *a;
int rem;
output_userspace(dp, skb, a);
break;
- case OVS_ACTION_ATTR_SET_TUNNEL:
- OVS_CB(skb)->tun_id = nla_get_be64(a);
- break;
-
case OVS_ACTION_ATTR_PUSH_VLAN:
- err = push_vlan(skb, nla_get_be16(a));
- if (unlikely(err)) /* skb already freed */
+ err = push_vlan(skb, nla_data(a));
+ if (unlikely(err)) /* skb already freed. */
return err;
break;
err = pop_vlan(skb);
break;
- case OVS_ACTION_ATTR_SET_DL_SRC:
- err = make_writable(skb, ETH_HLEN);
- if (likely(!err))
- memcpy(eth_hdr(skb)->h_source, nla_data(a), ETH_ALEN);
- break;
-
- case OVS_ACTION_ATTR_SET_DL_DST:
- err = make_writable(skb, ETH_HLEN);
- if (likely(!err))
- memcpy(eth_hdr(skb)->h_dest, nla_data(a), ETH_ALEN);
- break;
-
- case OVS_ACTION_ATTR_SET_NW_SRC:
- case OVS_ACTION_ATTR_SET_NW_DST:
- err = set_nw_addr(skb, a);
- break;
-
- case OVS_ACTION_ATTR_SET_NW_TOS:
- err = set_nw_tos(skb, nla_get_u8(a));
- break;
-
- case OVS_ACTION_ATTR_SET_TP_SRC:
- case OVS_ACTION_ATTR_SET_TP_DST:
- err = set_tp_port(skb, a);
- break;
-
- case OVS_ACTION_ATTR_SET_PRIORITY:
- skb->priority = nla_get_u32(a);
- break;
-
- case OVS_ACTION_ATTR_POP_PRIORITY:
- skb->priority = priority;
+ case OVS_ACTION_ATTR_SET:
+ err = execute_set_action(skb, nla_data(a));
break;
case OVS_ACTION_ATTR_SAMPLE:
err = sample(dp, skb, a);
break;
-
}
+
if (unlikely(err)) {
kfree_skb(skb);
return err;
{
if (net_ratelimit())
pr_warn("%s: flow looped %d times, dropping\n",
- dp_name(dp), MAX_LOOPS);
+ ovs_dp_name(dp), MAX_LOOPS);
actions->actions_len = 0;
return -ELOOP;
}
/* Execute a list of actions against 'skb'. */
-int execute_actions(struct datapath *dp, struct sk_buff *skb)
+int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb)
{
struct sw_flow_actions *acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
struct loop_counter *loop;
git://git.onelab.eu / sliver-openvswitch.git / blobdiff