/*
* Distributed under the terms of the GNU GPL version 2.
- * Copyright (c) 2007, 2008, 2009, 2010 Nicira Networks.
+ * Copyright (c) 2007, 2008, 2009, 2010, 2011 Nicira Networks.
*
* Significant portions of this file may be copied from parts of the Linux
* kernel, by Linus Torvalds and others.
#include "actions.h"
#include "checksum.h"
#include "datapath.h"
+#include "loop_counter.h"
#include "openvswitch/datapath-protocol.h"
+#include "vlan.h"
#include "vport.h"
static int do_execute_actions(struct datapath *, struct sk_buff *,
- const struct sw_flow_key *,
- const struct nlattr *actions, u32 actions_len);
+ struct sw_flow_actions *acts);
-static struct sk_buff *make_writable(struct sk_buff *skb, unsigned min_headroom)
+static int make_writable(struct sk_buff *skb, int write_len)
{
- if (skb_cloned(skb)) {
- struct sk_buff *nskb;
- unsigned headroom = max(min_headroom, skb_headroom(skb));
+ if (!skb_cloned(skb) || skb_clone_writable(skb, write_len))
+ return 0;
- nskb = skb_copy_expand(skb, headroom, skb_tailroom(skb), GFP_ATOMIC);
- if (nskb) {
- set_skb_csum_bits(skb, nskb);
- kfree_skb(skb);
- return nskb;
- }
- } else {
- unsigned int hdr_len = (skb_transport_offset(skb)
- + sizeof(struct tcphdr));
- if (pskb_may_pull(skb, min(hdr_len, skb->len)))
- return skb;
- }
- kfree_skb(skb);
- return NULL;
+ return pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
}
-static struct sk_buff *vlan_pull_tag(struct sk_buff *skb)
+static int strip_vlan(struct sk_buff *skb)
{
- struct vlan_ethhdr *vh = vlan_eth_hdr(skb);
struct ethhdr *eh;
+ int err;
+
+ if (vlan_tx_tag_present(skb)) {
+ vlan_set_tci(skb, 0);
+ return 0;
+ }
+
+ if (unlikely(skb->protocol != htons(ETH_P_8021Q) ||
+ skb->len < VLAN_ETH_HLEN))
+ return 0;
- /* Verify we were given a vlan packet */
- if (vh->h_vlan_proto != htons(ETH_P_8021Q) || skb->len < VLAN_ETH_HLEN)
- return skb;
+ err = make_writable(skb, VLAN_ETH_HLEN);
+ if (unlikely(err))
+ return err;
if (get_ip_summed(skb) == OVS_CSUM_COMPLETE)
skb->csum = csum_sub(skb->csum, csum_partial(skb->data
+ ETH_HLEN, VLAN_HLEN, 0));
- memmove(skb->data + VLAN_HLEN, skb->data, 2 * VLAN_ETH_ALEN);
+ memmove(skb->data + VLAN_HLEN, skb->data, 2 * ETH_ALEN);
eh = (struct ethhdr *)skb_pull(skb, VLAN_HLEN);
skb->protocol = eh->h_proto;
skb->mac_header += VLAN_HLEN;
- return skb;
+ return 0;
}
-static struct sk_buff *modify_vlan_tci(struct datapath *dp, struct sk_buff *skb,
- const struct sw_flow_key *key,
- const struct nlattr *a, u32 actions_len)
+static int modify_vlan_tci(struct sk_buff *skb, __be16 tci)
{
- __be16 tci = nla_get_be16(a);
-
- skb = make_writable(skb, VLAN_HLEN);
- if (!skb)
- return ERR_PTR(-ENOMEM);
-
- if (skb->protocol == htons(ETH_P_8021Q)) {
- /* Modify vlan id, but maintain other TCI values */
- struct vlan_ethhdr *vh;
- __be16 old_tci;
-
- if (skb->len < VLAN_ETH_HLEN)
- return skb;
-
- vh = vlan_eth_hdr(skb);
- old_tci = vh->h_vlan_TCI;
-
- vh->h_vlan_TCI = tci;
-
- if (get_ip_summed(skb) == OVS_CSUM_COMPLETE) {
- __be16 diff[] = { ~old_tci, vh->h_vlan_TCI };
-
- skb->csum = ~csum_partial((char *)diff, sizeof(diff),
- ~skb->csum);
- }
- } else {
+ if (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_8021Q)) {
int err;
- /* Add vlan header */
-
- /* Set up checksumming pointers for checksum-deferred packets
- * on Xen. Otherwise, dev_queue_xmit() will try to do this
- * when we send the packet out on the wire, and it will fail at
- * that point because skb_checksum_setup() will not look inside
- * an 802.1Q header. */
- err = vswitch_skb_checksum_setup(skb);
- if (unlikely(err)) {
- kfree_skb(skb);
- return ERR_PTR(err);
- }
+ if (unlikely(skb->len < VLAN_ETH_HLEN))
+ return 0;
- /* GSO is not implemented for packets with an 802.1Q header, so
- * we have to do segmentation before we add that header.
- *
- * GSO does work with hardware-accelerated VLAN tagging, but we
- * can't use hardware-accelerated VLAN tagging since it
- * requires the device to have a VLAN group configured (with
- * e.g. vconfig(8)) and we don't do that.
- *
- * Having to do this here may be a performance loss, since we
- * can't take advantage of TSO hardware support, although it
- * does not make a measurable network performance difference
- * for 1G Ethernet. Fixing that would require patching the
- * kernel (either to add GSO support to the VLAN protocol or to
- * support hardware-accelerated VLAN tagging without VLAN
- * groups configured). */
- if (skb_is_gso(skb)) {
- const struct nlattr *actions_left;
- int actions_len_left;
- struct sk_buff *segs;
-
- segs = skb_gso_segment(skb, 0);
- kfree_skb(skb);
- if (IS_ERR(segs))
- return ERR_CAST(segs);
-
- actions_len_left = actions_len;
- actions_left = nla_next(a, &actions_len_left);
-
- do {
- struct sk_buff *nskb = segs->next;
-
- segs->next = NULL;
-
- /* GSO can change the checksum type so update.*/
- compute_ip_summed(segs, true);
-
- segs = __vlan_put_tag(segs, ntohs(tci));
- err = -ENOMEM;
- if (segs) {
- err = do_execute_actions(
- dp, segs, key, actions_left,
- actions_len_left);
- }
-
- if (unlikely(err)) {
- while ((segs = nskb)) {
- nskb = segs->next;
- segs->next = NULL;
- kfree_skb(segs);
- }
- return ERR_PTR(err);
- }
-
- segs = nskb;
- } while (segs->next);
-
- skb = segs;
- compute_ip_summed(skb, true);
- }
-
- /* The hardware-accelerated version of vlan_put_tag() works
- * only for a device that has a VLAN group configured (with
- * e.g. vconfig(8)), so call the software-only version
- * __vlan_put_tag() directly instead.
- */
- skb = __vlan_put_tag(skb, ntohs(tci));
- if (!skb)
- return ERR_PTR(-ENOMEM);
-
- /* GSO doesn't fix up the hardware computed checksum so this
- * will only be hit in the non-GSO case. */
- if (get_ip_summed(skb) == OVS_CSUM_COMPLETE)
- skb->csum = csum_add(skb->csum, csum_partial(skb->data
- + ETH_HLEN, VLAN_HLEN, 0));
+ err = strip_vlan(skb);
+ if (unlikely(err))
+ return err;
}
- return skb;
-}
+ __vlan_hwaccel_put_tag(skb, ntohs(tci));
-static struct sk_buff *strip_vlan(struct sk_buff *skb)
-{
- skb = make_writable(skb, 0);
- if (skb)
- vlan_pull_tag(skb);
- return skb;
+ return 0;
}
-static bool is_ip(struct sk_buff *skb, const struct sw_flow_key *key)
+static bool is_ip(struct sk_buff *skb)
{
- return (key->dl_type == htons(ETH_P_IP) &&
+ return (OVS_CB(skb)->flow->key.eth.type == htons(ETH_P_IP) &&
skb->transport_header > skb->network_header);
}
-static __sum16 *get_l4_checksum(struct sk_buff *skb, const struct sw_flow_key *key)
+static __sum16 *get_l4_checksum(struct sk_buff *skb)
{
+ u8 nw_proto = OVS_CB(skb)->flow->key.ip.proto;
int transport_len = skb->len - skb_transport_offset(skb);
- if (key->nw_proto == IPPROTO_TCP) {
+ if (nw_proto == IPPROTO_TCP) {
if (likely(transport_len >= sizeof(struct tcphdr)))
return &tcp_hdr(skb)->check;
- } else if (key->nw_proto == IPPROTO_UDP) {
+ } else if (nw_proto == IPPROTO_UDP) {
if (likely(transport_len >= sizeof(struct udphdr)))
return &udp_hdr(skb)->check;
}
return NULL;
}
-static struct sk_buff *set_nw_addr(struct sk_buff *skb,
- const struct sw_flow_key *key,
- const struct nlattr *a)
+static int set_nw_addr(struct sk_buff *skb, const struct nlattr *a)
{
__be32 new_nwaddr = nla_get_be32(a);
struct iphdr *nh;
__sum16 *check;
__be32 *nwaddr;
+ int err;
- if (unlikely(!is_ip(skb, key)))
- return skb;
+ if (unlikely(!is_ip(skb)))
+ return 0;
- skb = make_writable(skb, 0);
- if (unlikely(!skb))
- return NULL;
+ err = make_writable(skb, skb_network_offset(skb) +
+ sizeof(struct iphdr));
+ if (unlikely(err))
+ return err;
nh = ip_hdr(skb);
- nwaddr = nla_type(a) == ODPAT_SET_NW_SRC ? &nh->saddr : &nh->daddr;
+ nwaddr = nla_type(a) == ODP_ACTION_ATTR_SET_NW_SRC ? &nh->saddr : &nh->daddr;
- check = get_l4_checksum(skb, key);
+ 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);
+ skb_clear_rxhash(skb);
+
*nwaddr = new_nwaddr;
- return skb;
+ return 0;
}
-static struct sk_buff *set_nw_tos(struct sk_buff *skb,
- const struct sw_flow_key *key,
- u8 nw_tos)
+static int set_nw_tos(struct sk_buff *skb, u8 nw_tos)
{
- if (unlikely(!is_ip(skb, key)))
- return skb;
-
- skb = make_writable(skb, 0);
- if (skb) {
- struct iphdr *nh = ip_hdr(skb);
- u8 *f = &nh->tos;
- u8 old = *f;
- u8 new;
-
- /* Set the DSCP bits and preserve the ECN bits. */
- new = nw_tos | (nh->tos & INET_ECN_MASK);
- csum_replace4(&nh->check, (__force __be32)old,
- (__force __be32)new);
- *f = new;
- }
- return skb;
+ struct iphdr *nh = ip_hdr(skb);
+ u8 old, new;
+ 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;
+
+ /* 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;
+
+ return 0;
}
-static struct sk_buff *set_tp_port(struct sk_buff *skb,
- const struct sw_flow_key *key,
- const struct nlattr *a)
+static int set_tp_port(struct sk_buff *skb, const struct nlattr *a)
{
struct udphdr *th;
__sum16 *check;
__be16 *port;
+ int err;
- if (unlikely(!is_ip(skb, key)))
- return skb;
+ if (unlikely(!is_ip(skb)))
+ return 0;
- skb = make_writable(skb, 0);
- if (unlikely(!skb))
- return NULL;
+ 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, key);
+ check = get_l4_checksum(skb);
if (unlikely(!check))
- return skb;
+ return 0;
/*
* Update port and checksum.
* supports those protocols.
*/
th = udp_hdr(skb);
- port = nla_type(a) == ODPAT_SET_TP_SRC ? &th->source : &th->dest;
+ port = nla_type(a) == ODP_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);
- return skb;
-}
-
-/**
- * is_spoofed_arp - check for invalid ARP packet
- *
- * @skb: skbuff containing an Ethernet packet, with network header pointing
- * just past the Ethernet and optional 802.1Q header.
- * @key: flow key extracted from @skb by flow_extract()
- *
- * Returns true if @skb is an invalid Ethernet+IPv4 ARP packet: one with screwy
- * or truncated header fields or one whose inner and outer Ethernet address
- * differ.
- */
-static bool is_spoofed_arp(struct sk_buff *skb, const struct sw_flow_key *key)
-{
- struct arp_eth_header *arp;
-
- if (key->dl_type != htons(ETH_P_ARP))
- return false;
-
- if (skb_network_offset(skb) + sizeof(struct arp_eth_header) > skb->len)
- return true;
-
- arp = (struct arp_eth_header *)skb_network_header(skb);
- return (arp->ar_hrd != htons(ARPHRD_ETHER) ||
- arp->ar_pro != htons(ETH_P_IP) ||
- arp->ar_hln != ETH_ALEN ||
- arp->ar_pln != 4 ||
- compare_ether_addr(arp->ar_sha, eth_hdr(skb)->h_source));
+ return 0;
}
static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port)
kfree_skb(skb);
}
-static int output_control(struct datapath *dp, struct sk_buff *skb, u64 arg,
- const struct sw_flow_key *key)
+static int output_userspace(struct datapath *dp, struct sk_buff *skb, u64 arg)
{
struct dp_upcall_info upcall;
if (!skb)
return -ENOMEM;
- upcall.type = _ODPL_ACTION_NR;
- upcall.key = key;
+ upcall.cmd = ODP_PACKET_CMD_ACTION;
+ upcall.key = &OVS_CB(skb)->flow->key;
upcall.userdata = arg;
upcall.sample_pool = 0;
upcall.actions = NULL;
/* Execute a list of actions against 'skb'. */
static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
- const struct sw_flow_key *key,
- const struct nlattr *actions, u32 actions_len)
+ struct sw_flow_actions *acts)
{
/* 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
int prev_port = -1;
u32 priority = skb->priority;
const struct nlattr *a;
- int rem, err;
+ int rem;
+
+ for (a = acts->actions, rem = acts->actions_len; rem > 0;
+ a = nla_next(a, &rem)) {
+ int err = 0;
- for (a = actions, rem = actions_len; rem > 0; a = nla_next(a, &rem)) {
if (prev_port != -1) {
do_output(dp, skb_clone(skb, GFP_ATOMIC), prev_port);
prev_port = -1;
}
switch (nla_type(a)) {
- case ODPAT_OUTPUT:
+ case ODP_ACTION_ATTR_OUTPUT:
prev_port = nla_get_u32(a);
break;
- case ODPAT_CONTROLLER:
- err = output_control(dp, skb, nla_get_u64(a), key);
- if (err) {
- kfree_skb(skb);
- return err;
- }
+ case ODP_ACTION_ATTR_USERSPACE:
+ err = output_userspace(dp, skb, nla_get_u64(a));
break;
- case ODPAT_SET_TUNNEL:
+ case ODP_ACTION_ATTR_SET_TUNNEL:
OVS_CB(skb)->tun_id = nla_get_be64(a);
break;
- case ODPAT_SET_DL_TCI:
- skb = modify_vlan_tci(dp, skb, key, a, rem);
- if (IS_ERR(skb))
- return PTR_ERR(skb);
+ case ODP_ACTION_ATTR_SET_DL_TCI:
+ err = modify_vlan_tci(skb, nla_get_be16(a));
break;
- case ODPAT_STRIP_VLAN:
- skb = strip_vlan(skb);
+ case ODP_ACTION_ATTR_STRIP_VLAN:
+ err = strip_vlan(skb);
break;
- case ODPAT_SET_DL_SRC:
- skb = make_writable(skb, 0);
- if (!skb)
- return -ENOMEM;
- memcpy(eth_hdr(skb)->h_source, nla_data(a), ETH_ALEN);
+ case ODP_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 ODPAT_SET_DL_DST:
- skb = make_writable(skb, 0);
- if (!skb)
- return -ENOMEM;
- memcpy(eth_hdr(skb)->h_dest, nla_data(a), ETH_ALEN);
+ case ODP_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 ODPAT_SET_NW_SRC:
- case ODPAT_SET_NW_DST:
- skb = set_nw_addr(skb, key, a);
+ case ODP_ACTION_ATTR_SET_NW_SRC:
+ case ODP_ACTION_ATTR_SET_NW_DST:
+ err = set_nw_addr(skb, a);
break;
- case ODPAT_SET_NW_TOS:
- skb = set_nw_tos(skb, key, nla_get_u8(a));
+ case ODP_ACTION_ATTR_SET_NW_TOS:
+ err = set_nw_tos(skb, nla_get_u8(a));
break;
- case ODPAT_SET_TP_SRC:
- case ODPAT_SET_TP_DST:
- skb = set_tp_port(skb, key, a);
+ case ODP_ACTION_ATTR_SET_TP_SRC:
+ case ODP_ACTION_ATTR_SET_TP_DST:
+ err = set_tp_port(skb, a);
break;
- case ODPAT_SET_PRIORITY:
+ case ODP_ACTION_ATTR_SET_PRIORITY:
skb->priority = nla_get_u32(a);
break;
- case ODPAT_POP_PRIORITY:
+ case ODP_ACTION_ATTR_POP_PRIORITY:
skb->priority = priority;
break;
+ }
- case ODPAT_DROP_SPOOFED_ARP:
- if (unlikely(is_spoofed_arp(skb, key)))
- goto exit;
- break;
+ if (unlikely(err)) {
+ kfree_skb(skb);
+ return err;
}
- if (!skb)
- return -ENOMEM;
}
-exit:
+
if (prev_port != -1)
do_output(dp, skb, prev_port);
else
- kfree_skb(skb);
+ consume_skb(skb);
+
return 0;
}
static void sflow_sample(struct datapath *dp, struct sk_buff *skb,
- const struct sw_flow_key *key,
- const struct nlattr *a, u32 actions_len)
+ struct sw_flow_actions *acts)
{
struct sk_buff *nskb;
struct vport *p = OVS_CB(skb)->vport;
if (unlikely(!nskb))
return;
- upcall.type = _ODPL_SFLOW_NR;
- upcall.key = key;
+ upcall.cmd = ODP_PACKET_CMD_SAMPLE;
+ upcall.key = &OVS_CB(skb)->flow->key;
upcall.userdata = 0;
upcall.sample_pool = atomic_read(&p->sflow_pool);
- upcall.actions = a;
- upcall.actions_len = actions_len;
+ upcall.actions = acts->actions;
+ upcall.actions_len = acts->actions_len;
dp_upcall(dp, nskb, &upcall);
}
/* Execute a list of actions against 'skb'. */
-int execute_actions(struct datapath *dp, struct sk_buff *skb,
- const struct sw_flow_key *key,
- const struct nlattr *actions, u32 actions_len)
+int execute_actions(struct datapath *dp, struct sk_buff *skb)
{
- if (dp->sflow_probability)
- sflow_sample(dp, skb, key, actions, actions_len);
+ struct sw_flow_actions *acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
+ struct loop_counter *loop;
+ int error;
+
+ /* Check whether we've looped too much. */
+ loop = loop_get_counter();
+ if (unlikely(++loop->count > MAX_LOOPS))
+ loop->looping = true;
+ if (unlikely(loop->looping)) {
+ error = loop_suppress(dp, acts);
+ kfree_skb(skb);
+ goto out_loop;
+ }
+ /* Really execute actions. */
+ if (dp->sflow_probability)
+ sflow_sample(dp, skb, acts);
OVS_CB(skb)->tun_id = 0;
+ error = do_execute_actions(dp, skb, acts);
+
+ /* Check whether sub-actions looped too much. */
+ if (unlikely(loop->looping))
+ error = loop_suppress(dp, acts);
+
+out_loop:
+ /* Decrement loop counter. */
+ if (!--loop->count)
+ loop->looping = false;
+ loop_put_counter();
- return do_execute_actions(dp, skb, key, actions, actions_len);
+ return error;
}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff