diff options
| author | Joe Stringer <joe@wand.net.nz> | 2013-08-22 12:30:48 -0700 |
|---|---|---|
| committer | Jesse Gross <jesse@nicira.com> | 2013-08-26 14:03:13 -0700 |
| commit | a175a723301a8a4a9fedf9ce5b8ca586e7a97b40 (patch) | |
| tree | dcf29aa0043498e2e6ef231c38873345a21a7eff /net/openvswitch/actions.c | |
| parent | 280c571e1a0f553d4f2384f1a8b643b5de26e0ec (diff) | |
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>
Diffstat (limited to 'net/openvswitch/actions.c')
| -rw-r--r-- | net/openvswitch/actions.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c index 1f680222f4f7..65cfaa816075 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 @@ static int set_tcp(struct sk_buff *skb, const struct ovs_key_tcp *tcp_port_key) 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 @@ static int execute_set_action(struct sk_buff *skb, 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; |