/*
* Distributed under the terms of the GNU GPL version 2.
- * Copyright (c) 2007, 2008, 2009 Nicira Networks.
+ * Copyright (c) 2007, 2008, 2009, 2010 Nicira Networks.
*
* Significant portions of this file may be copied from parts of the Linux
* kernel, by Linus Torvalds and others.
#include <linux/udp.h>
#include <linux/in6.h>
#include <linux/if_vlan.h>
+#include <net/inet_ecn.h>
#include <net/ip.h>
#include <net/checksum.h>
-#include "datapath.h"
-#include "dp_dev.h"
+
#include "actions.h"
+#include "datapath.h"
#include "openvswitch/datapath-protocol.h"
+#include "vport.h"
-struct sk_buff *
-make_writable(struct sk_buff *skb, gfp_t gfp)
+static struct sk_buff *
+make_writable(struct sk_buff *skb, unsigned min_headroom, gfp_t gfp)
{
if (skb_shared(skb) || skb_cloned(skb)) {
- struct sk_buff *nskb = skb_copy(skb, gfp);
+ struct sk_buff *nskb;
+ unsigned headroom = max(min_headroom, skb_headroom(skb));
+
+ nskb = skb_copy_expand(skb, headroom, skb_tailroom(skb), gfp);
if (nskb) {
+ set_skb_csum_bits(skb, nskb);
kfree_skb(skb);
return nskb;
}
return NULL;
}
+static void set_tunnel(struct sk_buff *skb, struct odp_flow_key *key,
+ __be32 tun_id)
+{
+ OVS_CB(skb)->tun_id = key->tun_id = tun_id;
+}
static struct sk_buff *
vlan_pull_tag(struct sk_buff *skb)
struct vlan_ethhdr *vh = vlan_eth_hdr(skb);
struct ethhdr *eh;
-
/* Verify we were given a vlan packet */
if (vh->h_vlan_proto != htons(ETH_P_8021Q))
return skb;
+ if (OVS_CB(skb)->ip_summed == 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);
eh = (struct ethhdr *)skb_pull(skb, VLAN_HLEN);
if (a->type == ODPAT_SET_VLAN_VID) {
tci = ntohs(a->vlan_vid.vlan_vid);
mask = VLAN_VID_MASK;
- key->dl_vlan = htons(tci & mask);
+ key->dl_vlan = a->vlan_vid.vlan_vid;
} else {
- tci = a->vlan_pcp.vlan_pcp << 13;
+ tci = a->vlan_pcp.vlan_pcp << VLAN_PCP_SHIFT;
mask = VLAN_PCP_MASK;
+ key->dl_vlan_pcp = a->vlan_pcp.vlan_pcp;
}
- skb = make_writable(skb, gfp);
+ skb = make_writable(skb, VLAN_HLEN, gfp);
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 = vlan_eth_hdr(skb);
+ __be16 old_tci = vh->h_vlan_TCI;
+
vh->h_vlan_TCI = htons((ntohs(vh->h_vlan_TCI) & ~mask) | tci);
+
+ if (OVS_CB(skb)->ip_summed == OVS_CSUM_COMPLETE) {
+ __be16 diff[] = { ~old_tci, vh->h_vlan_TCI };
+
+ skb->csum = ~csum_partial((char *)diff, sizeof(diff),
+ ~skb->csum);
+ }
} else {
/* Add vlan header */
segs->next = NULL;
+ /* GSO can change the checksum type so update.*/
+ compute_ip_summed(segs, true);
+
segs = __vlan_put_tag(segs, tci);
err = -ENOMEM;
if (segs) {
} while (segs->next);
skb = segs;
+ compute_ip_summed(skb, true);
}
/* The hardware-accelerated version of vlan_put_tag() works
skb = __vlan_put_tag(skb, 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 (OVS_CB(skb)->ip_summed == OVS_CSUM_COMPLETE)
+ skb->csum = csum_add(skb->csum, csum_partial(skb->data
+ + ETH_HLEN, VLAN_HLEN, 0));
}
return skb;
static struct sk_buff *strip_vlan(struct sk_buff *skb,
struct odp_flow_key *key, gfp_t gfp)
{
- skb = make_writable(skb, gfp);
+ skb = make_writable(skb, 0, gfp);
if (skb) {
vlan_pull_tag(skb);
key->dl_vlan = htons(ODP_VLAN_NONE);
}
static struct sk_buff *set_dl_addr(struct sk_buff *skb,
+ struct odp_flow_key *key,
const struct odp_action_dl_addr *a,
gfp_t gfp)
{
- skb = make_writable(skb, gfp);
+ skb = make_writable(skb, 0, gfp);
if (skb) {
struct ethhdr *eh = eth_hdr(skb);
- memcpy(a->type == ODPAT_SET_DL_SRC ? eh->h_source : eh->h_dest,
- a->dl_addr, ETH_ALEN);
+ if (a->type == ODPAT_SET_DL_SRC) {
+ memcpy(eh->h_source, a->dl_addr, ETH_ALEN);
+ memcpy(key->dl_src, a->dl_addr, ETH_ALEN);
+ } else {
+ memcpy(eh->h_dest, a->dl_addr, ETH_ALEN);
+ memcpy(key->dl_dst, a->dl_addr, ETH_ALEN);
+ }
}
return skb;
}
__be32 from, __be32 to, int pseudohdr)
{
__be32 diff[] = { ~from, to };
- if (skb->ip_summed != CHECKSUM_PARTIAL) {
+
+ if (OVS_CB(skb)->ip_summed != OVS_CSUM_PARTIAL) {
*sum = csum_fold(csum_partial((char *)diff, sizeof(diff),
~csum_unfold(*sum)));
- if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
+ if (OVS_CB(skb)->ip_summed == OVS_CSUM_COMPLETE && pseudohdr)
skb->csum = ~csum_partial((char *)diff, sizeof(diff),
~skb->csum);
} else if (pseudohdr)
if (key->dl_type != htons(ETH_P_IP))
return skb;
- skb = make_writable(skb, gfp);
+ skb = make_writable(skb, 0, gfp);
if (skb) {
struct iphdr *nh = ip_hdr(skb);
u32 *f = a->type == ODPAT_SET_NW_SRC ? &nh->saddr : &nh->daddr;
}
update_csum(&nh->check, skb, old, new, 0);
*f = new;
+
+ if (a->type == ODPAT_SET_NW_SRC)
+ key->nw_src = a->nw_addr;
+ else
+ key->nw_dst = a->nw_addr;
+ }
+ return skb;
+}
+
+static struct sk_buff *set_nw_tos(struct sk_buff *skb,
+ struct odp_flow_key *key,
+ const struct odp_action_nw_tos *a,
+ gfp_t gfp)
+{
+ if (key->dl_type != htons(ETH_P_IP))
+ return skb;
+
+ skb = make_writable(skb, 0, gfp);
+ 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 = a->nw_tos | (nh->tos & INET_ECN_MASK);
+ update_csum(&nh->check, skb, htons((uint16_t)old),
+ htons((uint16_t)new), 0);
+ *f = new;
+ key->nw_tos = a->nw_tos;
}
return skb;
}
else
return skb;
- skb = make_writable(skb, gfp);
+ skb = make_writable(skb, 0, gfp);
if (skb) {
struct udphdr *th = udp_hdr(skb);
u16 *f = a->type == ODPAT_SET_TP_SRC ? &th->source : &th->dest;
u16 old = *f;
u16 new = a->tp_port;
- update_csum((u16*)((u8*)skb->data + check_ofs),
- skb, old, new, 1);
+ update_csum((u16*)(skb_transport_header(skb) + check_ofs),
+ skb, old, new, 0);
*f = new;
+ if (a->type == ODPAT_SET_TP_SRC)
+ key->tp_src = a->tp_port;
+ else
+ key->tp_dst = a->tp_port;
}
return skb;
}
return length;
}
-int dp_xmit_skb(struct sk_buff *skb)
-{
- struct datapath *dp = skb->dev->br_port->dp;
- int len = skb->len;
-
- if (packet_length(skb) > skb->dev->mtu && !skb_is_gso(skb)) {
- printk(KERN_WARNING "%s: dropped over-mtu packet: %d > %d\n",
- dp_name(dp), packet_length(skb), skb->dev->mtu);
- kfree_skb(skb);
- return -E2BIG;
- }
-
- dev_queue_xmit(skb);
-
- return len;
-}
-
static void
do_output(struct datapath *dp, struct sk_buff *skb, int out_port)
{
- struct net_bridge_port *p;
- struct net_device *dev;
+ struct dp_port *p;
+ int mtu;
if (!skb)
goto error;
- p = dp->ports[out_port];
+ p = rcu_dereference(dp->ports[out_port]);
if (!p)
goto error;
- dev = skb->dev = p->dev;
- if (is_dp_dev(dev))
- dp_dev_recv(dev, skb);
- else
- dp_xmit_skb(skb);
+ mtu = vport_get_mtu(p->vport);
+ if (packet_length(skb) > mtu && !skb_is_gso(skb)) {
+ printk(KERN_WARNING "%s: dropped over-mtu packet: %d > %d\n",
+ dp_name(dp), packet_length(skb), mtu);
+ goto error;
+ }
+
+ vport_send(p->vport, skb);
return;
error:
if (!g)
return -1;
for (i = 0; i < g->n_ports; i++) {
- struct net_bridge_port *p = dp->ports[g->ports[i]];
- if (!p || skb->dev == p->dev)
+ struct dp_port *p = rcu_dereference(dp->ports[g->ports[i]]);
+ if (!p || OVS_CB(skb)->dp_port == p)
continue;
if (prev_port != -1) {
struct sk_buff *clone = skb_clone(skb, gfp);
return dp_output_control(dp, skb, _ODPL_ACTION_NR, arg);
}
+/* Send a copy of this packet up to the sFlow agent, along with extra
+ * information about what happened to it. */
+static void sflow_sample(struct datapath *dp, struct sk_buff *skb,
+ const union odp_action *a, int n_actions,
+ gfp_t gfp, struct dp_port *dp_port)
+{
+ struct odp_sflow_sample_header *hdr;
+ unsigned int actlen = n_actions * sizeof(union odp_action);
+ unsigned int hdrlen = sizeof(struct odp_sflow_sample_header);
+ struct sk_buff *nskb;
+
+ nskb = skb_copy_expand(skb, actlen + hdrlen, 0, gfp);
+ if (!nskb)
+ return;
+
+ memcpy(__skb_push(nskb, actlen), a, actlen);
+ hdr = (struct odp_sflow_sample_header*)__skb_push(nskb, hdrlen);
+ hdr->n_actions = n_actions;
+ hdr->sample_pool = atomic_read(&dp_port->sflow_pool);
+ dp_output_control(dp, nskb, _ODPL_SFLOW_NR, 0);
+}
+
/* Execute a list of actions against 'skb'. */
int execute_actions(struct datapath *dp, struct sk_buff *skb,
struct odp_flow_key *key,
* 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;
int err;
+
+ if (dp->sflow_probability) {
+ struct dp_port *p = OVS_CB(skb)->dp_port;
+ if (p) {
+ atomic_inc(&p->sflow_pool);
+ if (dp->sflow_probability == UINT_MAX ||
+ net_random() < dp->sflow_probability)
+ sflow_sample(dp, skb, a, n_actions, gfp, p);
+ }
+ }
+
+ OVS_CB(skb)->tun_id = 0;
+
for (; n_actions > 0; a++, n_actions--) {
WARN_ON_ONCE(skb_shared(skb));
if (prev_port != -1) {
}
break;
+ case ODPAT_SET_TUNNEL:
+ set_tunnel(skb, key, a->tunnel.tun_id);
+ break;
+
case ODPAT_SET_VLAN_VID:
case ODPAT_SET_VLAN_PCP:
skb = modify_vlan_tci(dp, skb, key, a, n_actions, gfp);
case ODPAT_SET_DL_SRC:
case ODPAT_SET_DL_DST:
- skb = set_dl_addr(skb, &a->dl_addr, gfp);
+ skb = set_dl_addr(skb, key, &a->dl_addr, gfp);
break;
case ODPAT_SET_NW_SRC:
skb = set_nw_addr(skb, key, &a->nw_addr, gfp);
break;
+ case ODPAT_SET_NW_TOS:
+ skb = set_nw_tos(skb, key, &a->nw_tos, gfp);
+ break;
+
case ODPAT_SET_TP_SRC:
case ODPAT_SET_TP_DST:
skb = set_tp_port(skb, key, &a->tp_port, gfp);
break;
+
+ case ODPAT_SET_PRIORITY:
+ skb->priority = a->priority.priority;
+ break;
+
+ case ODPAT_POP_PRIORITY:
+ skb->priority = priority;
+ break;
}
if (!skb)
return -ENOMEM;
git://git.onelab.eu / sliver-openvswitch.git / blobdiff