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datapath: Add support for Geneve tunneling.

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This adds support for Geneve - Generic Network Virtualization
Encapsulation. The protocol is documented at
http://tools.ietf.org/html/draft-gross-geneve-00

The kernel implementation is completely agnostic to the options
that are in use and can handle newly defined options without
further work. It does this by simply matching on a byte array
of options and allowing userspace to setup flows on this array.

Userspace currently implements only support for basic version of
Geneve. It can work with the base header (including the VNI) and
is capable of parsing options but does not currently support any
particular option definitions. Over time, the intention is to
allow options to be matched through OpenFlow without requiring
explicit support in OVS userspace.

Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
This commit is contained in:
Jesse Gross
2014-06-05 19:07:32 -07:00
parent 1d2a1b5f52
commit c1fc1411d2
25 changed files with 768 additions and 43 deletions
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43
lib/odp-util.c
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@@ -833,12 +833,46 @@ tunnel_key_attr_len(int type)
case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT: return 0;
case OVS_TUNNEL_KEY_ATTR_CSUM: return 0;
case OVS_TUNNEL_KEY_ATTR_OAM: return 0;
case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS: return -2;
case __OVS_TUNNEL_KEY_ATTR_MAX:
return -1;
}
return -1;
}
#define GENEVE_OPT(class, type) ((OVS_FORCE uint32_t)(class) << 8 | (type))
static int
parse_geneve_opts(const struct nlattr *attr)
{
int opts_len = nl_attr_get_size(attr);
const struct geneve_opt *opt = nl_attr_get(attr);
while (opts_len > 0) {
int len;
if (opts_len < sizeof(*opt)) {
return -EINVAL;
}
len = sizeof(*opt) + opt->length * 4;
if (len > opts_len) {
return -EINVAL;
}
switch (GENEVE_OPT(opt->opt_class, opt->type)) {
default:
if (opt->type & GENEVE_CRIT_OPT_TYPE) {
return -EINVAL;
}
};
opt = opt + len / sizeof(*opt);
opts_len -= len;
};
return 0;
}
enum odp_key_fitness
odp_tun_key_from_attr(const struct nlattr *attr, struct flow_tnl *tun)
{
@@ -883,6 +917,15 @@ odp_tun_key_from_attr(const struct nlattr *attr, struct flow_tnl *tun)
case OVS_TUNNEL_KEY_ATTR_OAM:
tun->flags |= FLOW_TNL_F_OAM;
break;
case OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS: {
if (parse_geneve_opts(a)) {
return ODP_FIT_ERROR;
}
/* It is necessary to reproduce options exactly (including order)
* so it's easiest to just echo them back. */
unknown = true;
break;
}
default:
/* Allow this to show up as unexpected, if there are unknown
* tunnel attribute, eventually resulting in ODP_FIT_TOO_MUCH. */