@@ -29,6 +29,7 @@
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_labels.h>
#include <net/netfilter/nf_conntrack_seqadj.h>
+#include <net/netfilter/nf_conntrack_timeout.h>
#include <net/netfilter/nf_conntrack_zones.h>
#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
#include <net/ipv6_frag.h>
@@ -86,6 +87,7 @@ struct ovs_conntrack_info {
u32 eventmask; /* Mask of 1 << IPCT_*. */
struct md_mark mark;
struct md_labels labels;
+ char timeout[CTNL_TIMEOUT_NAME_MAX];
#ifdef CONFIG_NF_NAT_NEEDED
struct nf_nat_range2 range; /* Only present for SRC NAT and DST NAT. */
#endif
@@ -1519,6 +1521,8 @@ static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = {
#endif
[OVS_CT_ATTR_EVENTMASK] = { .minlen = sizeof(u32),
.maxlen = sizeof(u32) },
+ [OVS_CT_ATTR_TIMEOUT] = { .minlen = 1,
+ .maxlen = CTNL_TIMEOUT_NAME_MAX },
};
static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
@@ -1604,6 +1608,15 @@ static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
info->have_eventmask = true;
info->eventmask = nla_get_u32(a);
break;
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+ case OVS_CT_ATTR_TIMEOUT:
+ memcpy(info->timeout, nla_data(a), nla_len(a));
+ if (!memchr(info->timeout, '\0', nla_len(a))) {
+ OVS_NLERR(log, "Invalid conntrack helper");
+ return -EINVAL;
+ }
+ break;
+#endif
default:
OVS_NLERR(log, "Unknown conntrack attr (%d)",
@@ -1685,6 +1698,14 @@ int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
OVS_NLERR(log, "Failed to allocate conntrack template");
return -ENOMEM;
}
+
+ if (ct_info.timeout[0]) {
+ if (nf_ct_set_timeout(net, ct_info.ct, family, key->ip.proto,
+ ct_info.timeout))
+ pr_info_ratelimited("Failed to associated timeout "
+ "policy `%s'\n", ct_info.timeout);
+ }
+
if (helper) {
err = ovs_ct_add_helper(&ct_info, helper, key, log);
if (err)
@@ -1809,6 +1830,10 @@ int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
if (ct_info->have_eventmask &&
nla_put_u32(skb, OVS_CT_ATTR_EVENTMASK, ct_info->eventmask))
return -EMSGSIZE;
+ if (ct_info->timeout[0]) {
+ if (nla_put_string(skb, OVS_CT_ATTR_TIMEOUT, ct_info->timeout))
+ return -EMSGSIZE;
+ }
#ifdef CONFIG_NF_NAT_NEEDED
if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb))
@@ -1830,8 +1855,11 @@ static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info)
{
if (ct_info->helper)
nf_conntrack_helper_put(ct_info->helper);
- if (ct_info->ct)
+ if (ct_info->ct) {
+ if (ct_info->timeout[0])
+ nf_ct_destroy_timeout(ct_info->ct);
nf_ct_tmpl_free(ct_info->ct);
+ }
}
#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
@@ -801,6 +801,7 @@ struct ovs_action_push_tnl {
* be received on NFNLGRP_CONNTRACK_NEW and NFNLGRP_CONNTRACK_DESTROY groups,
* respectively. Remaining bits control the changes for which an event is
* delivered on the NFNLGRP_CONNTRACK_UPDATE group.
+ * @OVS_CT_ATTR_TIMEOUT: Variable length string defining conntrack timeout.
*/
enum ovs_ct_attr {
OVS_CT_ATTR_UNSPEC,
@@ -813,6 +814,9 @@ enum ovs_ct_attr {
OVS_CT_ATTR_NAT, /* Nested OVS_NAT_ATTR_* */
OVS_CT_ATTR_FORCE_COMMIT, /* No argument */
OVS_CT_ATTR_EVENTMASK, /* u32 mask of IPCT_* events. */
+ OVS_CT_ATTR_TIMEOUT, /* Associate timeout with this connection for
+ * fine-grain timeout tuning. */
+
__OVS_CT_ATTR_MAX
};
@@ -7204,6 +7204,10 @@ dp_execute_cb(void *aux_, struct dp_packet_batch *packets_,
/* Silently ignored, as userspace datapath does not generate
* netlink events. */
break;
+ case OVS_CT_ATTR_TIMEOUT:
+ /* Userspace datapath does not support customized timeout
+ * policy yet. */
+ break;
case OVS_CT_ATTR_NAT: {
const struct nlattr *b_nest;
unsigned int left_nest;
@@ -930,6 +930,8 @@ static const struct nl_policy ovs_conntrack_policy[] = {
[OVS_CT_ATTR_HELPER] = { .type = NL_A_STRING, .optional = true,
.min_len = 1, .max_len = 16 },
[OVS_CT_ATTR_NAT] = { .type = NL_A_UNSPEC, .optional = true },
+ [OVS_CT_ATTR_TIMEOUT] = { .type = NL_A_STRING, .optional = true,
+ .min_len = 1, .max_len = 32 },
};
static void
@@ -941,7 +943,7 @@ format_odp_conntrack_action(struct ds *ds, const struct nlattr *attr)
ovs_32aligned_u128 mask;
} *label;
const uint32_t *mark;
- const char *helper;
+ const char *helper, *timeout;
uint16_t zone;
bool commit, force;
const struct nlattr *nat;
@@ -957,10 +959,12 @@ format_odp_conntrack_action(struct ds *ds, const struct nlattr *attr)
mark = a[OVS_CT_ATTR_MARK] ? nl_attr_get(a[OVS_CT_ATTR_MARK]) : NULL;
label = a[OVS_CT_ATTR_LABELS] ? nl_attr_get(a[OVS_CT_ATTR_LABELS]): NULL;
helper = a[OVS_CT_ATTR_HELPER] ? nl_attr_get(a[OVS_CT_ATTR_HELPER]) : NULL;
+ timeout = a[OVS_CT_ATTR_TIMEOUT] ?
+ nl_attr_get(a[OVS_CT_ATTR_TIMEOUT]) : NULL;
nat = a[OVS_CT_ATTR_NAT];
ds_put_format(ds, "ct");
- if (commit || force || zone || mark || label || helper || nat) {
+ if (commit || force || zone || mark || label || helper || timeout || nat) {
ds_put_cstr(ds, "(");
if (commit) {
ds_put_format(ds, "commit,");
@@ -983,6 +987,9 @@ format_odp_conntrack_action(struct ds *ds, const struct nlattr *attr)
if (helper) {
ds_put_format(ds, "helper=%s,", helper);
}
+ if (timeout) {
+ ds_put_format(ds, "timeout=%s", timeout);
+ }
if (nat) {
format_odp_ct_nat(ds, nat);
}
@@ -1909,8 +1916,8 @@ parse_conntrack_action(const char *s_, struct ofpbuf *actions)
const char *s = s_;
if (ovs_scan(s, "ct")) {
- const char *helper = NULL;
- size_t helper_len = 0;
+ const char *helper = NULL, *timeout = NULL;
+ size_t helper_len = 0, timeout_len = 0;
bool commit = false;
bool force_commit = false;
uint16_t zone = 0;
@@ -1987,6 +1994,16 @@ find_end:
s += helper_len;
continue;
}
+ if (ovs_scan(s, "timeout=%n", &n)) {
+ s += n;
+ timeout_len = strcspn(s, delimiters_end);
+ if (!timeout_len || timeout_len > 31) {
+ return -EINVAL;
+ }
+ timeout = s;
+ s += timeout_len;
+ continue;
+ }
n = scan_ct_nat(s, &nat_params);
if (n > 0) {
@@ -2027,6 +2044,10 @@ find_end:
nl_msg_put_string__(actions, OVS_CT_ATTR_HELPER, helper,
helper_len);
}
+ if (timeout) {
+ nl_msg_put_string__(actions, OVS_CT_ATTR_TIMEOUT, timeout,
+ timeout_len);
+ }
if (have_nat) {
nl_msg_put_ct_nat(&nat_params, actions);
}
@@ -345,6 +345,7 @@ ct(commit,mark=0xa0a0a0a0/0xfefefefe)
ct(commit,label=0x1234567890abcdef1234567890abcdef/0xf1f2f3f4f5f6f7f8f9f0fafbfcfdfeff)
ct(commit,helper=ftp)
ct(commit,helper=tftp)
+ct(commit,timeout=ovs_tp_1_tcp4)
ct(nat)
ct(commit,nat(src))
ct(commit,nat(dst))
This patch adds support for specifying a timeout policy for a connection in connection tracking system in kernel datapath. The timeout policy will be attached to a connection when the connection is committed to conntrack. This patch introduces a new odp field OVS_CT_ATTR_TIMEOUT in the ct action that specifies the timeout policy in the datapath. In the following patch, during the upcall process, the vswitchd will use the ct_zone to look up the corresponding timeout policy and fill OVS_CT_ATTR_TIMEOUT if it is available. The datapath code is from the following two net-next upstream commits. Upstream commit: commit 06bd2bdf19d2f3d22731625e1a47fa1dff5ac407 Author: Yi-Hung Wei <yihung.wei@gmail.com> Date: Tue Mar 26 11:31:14 2019 -0700 openvswitch: Add timeout support to ct action Add support for fine-grain timeout support to conntrack action. The new OVS_CT_ATTR_TIMEOUT attribute of the conntrack action specifies a timeout to be associated with this connection. If no timeout is specified, it acts as is, that is the default timeout for the connection will be automatically applied. Example usage: $ nfct timeout add timeout_1 inet tcp syn_sent 100 established 200 $ ovs-ofctl add-flow br0 in_port=1,ip,tcp,action=ct(commit,timeout=timeout_1) CC: Pravin Shelar <pshelar@ovn.org> CC: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Yi-Hung Wei <yihung.wei@gmail.com> Acked-by: Pravin B Shelar <pshelar@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net> commit 6d670497e01803b486aa72cc1a718401ab986896 Author: Dan Carpenter <dan.carpenter@oracle.com> Date: Tue Apr 2 09:53:14 2019 +0300 openvswitch: use after free in __ovs_ct_free_action() We free "ct_info->ct" and then use it on the next line when we pass it to nf_ct_destroy_timeout(). This patch swaps the order to avoid the use after free. Fixes: 06bd2bdf19d2 ("openvswitch: Add timeout support to ct action") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Yi-Hung Wei <yihung.wei@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Yi-Hung Wei <yihung.wei@gmail.com> --- datapath/conntrack.c | 30 ++++++++++++++++++++++- datapath/linux/compat/include/linux/openvswitch.h | 4 +++ lib/dpif-netdev.c | 4 +++ lib/odp-util.c | 29 +++++++++++++++++++--- tests/odp.at | 1 + 5 files changed, 63 insertions(+), 5 deletions(-)