openvswitch: Add SCTP support
This patch adds support for rewriting SCTP src,dst ports similar to the
functionality already available for TCP/UDP.
Rewriting SCTP ports is expensive due to double-recalculation of the
SCTP checksums; this is performed to ensure that packets traversing OVS
with invalid checksums will continue to the destination with any
checksum corruption intact.
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Joe Stringer <joe@wand.net.nz>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
diff --git a/net/openvswitch/Kconfig b/net/openvswitch/Kconfig
index bed30e6..6ecf491 100644
--- a/net/openvswitch/Kconfig
+++ b/net/openvswitch/Kconfig
@@ -4,6 +4,7 @@
config OPENVSWITCH
tristate "Open vSwitch"
+ select LIBCRC32C
---help---
Open vSwitch is a multilayer Ethernet switch targeted at virtualized
environments. In addition to supporting a variety of features
diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 1f68022..65cfaa8 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -22,6 +22,7 @@
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/openvswitch.h>
+#include <linux/sctp.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/in6.h>
@@ -31,6 +32,7 @@
#include <net/ipv6.h>
#include <net/checksum.h>
#include <net/dsfield.h>
+#include <net/sctp/checksum.h>
#include "datapath.h"
#include "vport.h"
@@ -352,6 +354,39 @@
return 0;
}
+static int set_sctp(struct sk_buff *skb,
+ const struct ovs_key_sctp *sctp_port_key)
+{
+ struct sctphdr *sh;
+ int err;
+ unsigned int sctphoff = skb_transport_offset(skb);
+
+ err = make_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->rxhash = 0;
+ }
+
+ return 0;
+}
+
static int do_output(struct datapath *dp, struct sk_buff *skb, int out_port)
{
struct vport *vport;
@@ -461,6 +496,10 @@
case OVS_KEY_ATTR_UDP:
err = set_udp(skb, nla_data(nested_attr));
break;
+
+ case OVS_KEY_ATTR_SCTP:
+ err = set_sctp(skb, nla_data(nested_attr));
+ break;
}
return err;
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index d29cd9a..2aa13bd 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -712,6 +712,12 @@
return validate_tp_port(flow_key);
+ case OVS_KEY_ATTR_SCTP:
+ if (flow_key->ip.proto != IPPROTO_SCTP)
+ return -EINVAL;
+
+ return validate_tp_port(flow_key);
+
default:
return -EINVAL;
}
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 1fceb96..2b47855 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -34,6 +34,7 @@
#include <linux/if_arp.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
+#include <linux/sctp.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/icmp.h>
@@ -129,6 +130,7 @@
| (1 << OVS_KEY_ATTR_IPV6)
| (1 << OVS_KEY_ATTR_TCP)
| (1 << OVS_KEY_ATTR_UDP)
+ | (1 << OVS_KEY_ATTR_SCTP)
| (1 << OVS_KEY_ATTR_ICMP)
| (1 << OVS_KEY_ATTR_ICMPV6)
| (1 << OVS_KEY_ATTR_ARP)
@@ -159,6 +161,12 @@
mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
}
+ if (match->key->ip.proto == IPPROTO_SCTP) {
+ key_expected |= 1 << OVS_KEY_ATTR_SCTP;
+ if (match->mask && (match->mask->key.ip.proto == 0xff))
+ mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
+ }
+
if (match->key->ip.proto == IPPROTO_TCP) {
key_expected |= 1 << OVS_KEY_ATTR_TCP;
if (match->mask && (match->mask->key.ip.proto == 0xff))
@@ -185,6 +193,12 @@
mask_allowed |= 1 << OVS_KEY_ATTR_UDP;
}
+ if (match->key->ip.proto == IPPROTO_SCTP) {
+ key_expected |= 1 << OVS_KEY_ATTR_SCTP;
+ if (match->mask && (match->mask->key.ip.proto == 0xff))
+ mask_allowed |= 1 << OVS_KEY_ATTR_SCTP;
+ }
+
if (match->key->ip.proto == IPPROTO_TCP) {
key_expected |= 1 << OVS_KEY_ATTR_TCP;
if (match->mask && (match->mask->key.ip.proto == 0xff))
@@ -280,6 +294,12 @@
sizeof(struct udphdr));
}
+static bool sctphdr_ok(struct sk_buff *skb)
+{
+ return pskb_may_pull(skb, skb_transport_offset(skb) +
+ sizeof(struct sctphdr));
+}
+
static bool icmphdr_ok(struct sk_buff *skb)
{
return pskb_may_pull(skb, skb_transport_offset(skb) +
@@ -891,6 +911,12 @@
key->ipv4.tp.src = udp->source;
key->ipv4.tp.dst = udp->dest;
}
+ } else if (key->ip.proto == IPPROTO_SCTP) {
+ if (sctphdr_ok(skb)) {
+ struct sctphdr *sctp = sctp_hdr(skb);
+ key->ipv4.tp.src = sctp->source;
+ key->ipv4.tp.dst = sctp->dest;
+ }
} else if (key->ip.proto == IPPROTO_ICMP) {
if (icmphdr_ok(skb)) {
struct icmphdr *icmp = icmp_hdr(skb);
@@ -953,6 +979,12 @@
key->ipv6.tp.src = udp->source;
key->ipv6.tp.dst = udp->dest;
}
+ } else if (key->ip.proto == NEXTHDR_SCTP) {
+ if (sctphdr_ok(skb)) {
+ struct sctphdr *sctp = sctp_hdr(skb);
+ key->ipv6.tp.src = sctp->source;
+ key->ipv6.tp.dst = sctp->dest;
+ }
} else if (key->ip.proto == NEXTHDR_ICMP) {
if (icmp6hdr_ok(skb)) {
error = parse_icmpv6(skb, key, nh_len);
@@ -1087,6 +1119,7 @@
[OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6),
[OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp),
[OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp),
+ [OVS_KEY_ATTR_SCTP] = sizeof(struct ovs_key_sctp),
[OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp),
[OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
[OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
@@ -1500,6 +1533,24 @@
attrs &= ~(1 << OVS_KEY_ATTR_UDP);
}
+ if (attrs & (1 << OVS_KEY_ATTR_SCTP)) {
+ const struct ovs_key_sctp *sctp_key;
+
+ sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
+ if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) {
+ SW_FLOW_KEY_PUT(match, ipv4.tp.src,
+ sctp_key->sctp_src, is_mask);
+ SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
+ sctp_key->sctp_dst, is_mask);
+ } else {
+ SW_FLOW_KEY_PUT(match, ipv6.tp.src,
+ sctp_key->sctp_src, is_mask);
+ SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
+ sctp_key->sctp_dst, is_mask);
+ }
+ attrs &= ~(1 << OVS_KEY_ATTR_SCTP);
+ }
+
if (attrs & (1 << OVS_KEY_ATTR_ICMP)) {
const struct ovs_key_icmp *icmp_key;
@@ -1843,6 +1894,20 @@
udp_key->udp_src = output->ipv6.tp.src;
udp_key->udp_dst = output->ipv6.tp.dst;
}
+ } else if (swkey->ip.proto == IPPROTO_SCTP) {
+ struct ovs_key_sctp *sctp_key;
+
+ nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key));
+ if (!nla)
+ goto nla_put_failure;
+ sctp_key = nla_data(nla);
+ if (swkey->eth.type == htons(ETH_P_IP)) {
+ sctp_key->sctp_src = swkey->ipv4.tp.src;
+ sctp_key->sctp_dst = swkey->ipv4.tp.dst;
+ } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
+ sctp_key->sctp_src = swkey->ipv6.tp.src;
+ sctp_key->sctp_dst = swkey->ipv6.tp.dst;
+ }
} else if (swkey->eth.type == htons(ETH_P_IP) &&
swkey->ip.proto == IPPROTO_ICMP) {
struct ovs_key_icmp *icmp_key;
diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
index 9674e45..d08dcf7 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -99,8 +99,8 @@
} addr;
union {
struct {
- __be16 src; /* TCP/UDP source port. */
- __be16 dst; /* TCP/UDP destination port. */
+ __be16 src; /* TCP/UDP/SCTP source port. */
+ __be16 dst; /* TCP/UDP/SCTP destination port. */
} tp;
struct {
u8 sha[ETH_ALEN]; /* ARP source hardware address. */
@@ -115,8 +115,8 @@
} addr;
__be32 label; /* IPv6 flow label. */
struct {
- __be16 src; /* TCP/UDP source port. */
- __be16 dst; /* TCP/UDP destination port. */
+ __be16 src; /* TCP/UDP/SCTP source port. */
+ __be16 dst; /* TCP/UDP/SCTP destination port. */
} tp;
struct {
struct in6_addr target; /* ND target address. */