For dnat_and_snat rules which are meant to be stateless instead of using ct_snat/dnat OVN actions, we will use ipv4.src/ipv4.dst.
This actions will do 1:1 mapping to inner ip to external ip, while recalculating the checksums. Signed-off-by: Ankur Sharma <[email protected]> --- northd/ovn-northd.8.xml | 34 +++++++++++++++---- northd/ovn-northd.c | 86 +++++++++++++++++++++++++++++++++++++++++++------ tests/ovn-northd.at | 50 ++++++++++++++++++++++++++++ 3 files changed, 154 insertions(+), 16 deletions(-) diff --git a/northd/ovn-northd.8.xml b/northd/ovn-northd.8.xml index 0f4f1c1..7d5d102 100644 --- a/northd/ovn-northd.8.xml +++ b/northd/ovn-northd.8.xml @@ -1718,7 +1718,9 @@ icmp6 { to change the source IP address of a packet from <var>A</var> to <var>B</var>, a priority-90 flow matches <code>ip && ip4.dst == <var>B</var></code> with an action - <code>ct_snat; </code>. + <code>ct_snat; </code>. If the NAT rule is of type dnat_and_snat + and has <code>is_stateless=true</code> in the options, then the action + would be <code>replace_dst_ip(<var>B</var>)</code>. </p> <p> @@ -1738,7 +1740,10 @@ icmp6 { <var>B</var>, a priority-100 flow matches <code>ip && ip4.dst == <var>B</var> && inport == <var>GW</var></code>, where <var>GW</var> is the logical router gateway port, with an - action <code>ct_snat;</code>. + action <code>ct_snat;</code>. If the NAT rule is of type + dnat_and_snat and has <code>is_stateless=true</code> in the + options, then the action would be <code>replace_dst_ip + (<var>B</var>)</code>. </p> <p> @@ -1858,7 +1863,10 @@ icmp6 { Gateway router is configured to force SNAT any DNATed packet, the above action will be replaced by <code>flags.force_snat_for_dnat = 1; flags.loopback = 1; - ct_dnat(<var>B</var>);</code>. + ct_dnat(<var>B</var>);</code>. If the NAT rule is of type + dnat_and_snat and has <code>is_stateless=true</code> in the + options, then the action would be <code>replace_dst_ip + (<var>B</var>)</code>. </li> <li> @@ -1890,7 +1898,10 @@ icmp6 { <var>B</var>, a priority-100 flow matches <code>ip && ip4.dst == <var>B</var> && inport == <var>GW</var></code>, where <var>GW</var> is the logical router gateway port, with an - action <code>ct_dnat(<var>B</var>);</code>. + action <code>ct_dnat(<var>B</var>);</code>. If the NAT rule is of + type dnat_and_snat and has <code>is_stateless=true</code> in the + options, then the action would be <code>replace_dst_ip + (<var>B</var>)</code>. </p> <p> @@ -2553,7 +2564,10 @@ nd_ns { matches <code>ip && ip4.src == <var>B</var> && outport == <var>GW</var></code>, where <var>GW</var> is the logical router gateway port, with an action - <code>ct_dnat;</code>. + <code>ct_dnat;</code>. If the NAT rule is of type + dnat_and_snat and has <code>is_stateless=true</code> in the + options, then the action would be <code>replace_src_ip + (<var>B</var>)</code>. </p> <p> @@ -2611,7 +2625,10 @@ nd_ns { <code>ip && ip4.src == <var>A</var></code> with an action <code>ct_snat(<var>B</var>);</code>. The priority of the flow is calculated based on the mask of <var>A</var>, with matches - having larger masks getting higher priorities. + having larger masks getting higher priorities. If the NAT rule is + of type dnat_and_snat and has <code>is_stateless=true</code> in the + options, then the action would be <code>replace_src_ip + (<var>B</var>)</code>. </p> <p> A priority-0 logical flow with match <code>1</code> has actions @@ -2634,7 +2651,10 @@ nd_ns { logical router gateway port, with an action <code>ct_snat(<var>B</var>);</code>. The priority of the flow is calculated based on the mask of <var>A</var>, with matches - having larger masks getting higher priorities. + having larger masks getting higher priorities. If the NAT rule + is of type dnat_and_snat and has <code>is_stateless=true</code> + in the options, then the action would be <code>replace_src_ip + (<var>B</var>)</code>. </p> <p> diff --git a/northd/ovn-northd.c b/northd/ovn-northd.c index f393ceb..4036392 100644 --- a/northd/ovn-northd.c +++ b/northd/ovn-northd.c @@ -6314,6 +6314,18 @@ copy_ra_to_sb(struct ovn_port *op, const char *address_mode) smap_destroy(&options); } +static inline bool +lrouter_nat_is_stateless(const struct nbrec_nat *nat) +{ + const char *is_stateless = smap_get(&nat->options, "is_stateless"); + + if (is_stateless && !strcmp(is_stateless, "true")) { + return true; + } + + return false; +} + static void build_lrouter_flows(struct hmap *datapaths, struct hmap *ports, struct hmap *lflows, struct shash *meter_groups) @@ -7052,6 +7064,7 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap *ports, nat = od->nbr->nat[i]; ovs_be32 ip, mask; + bool is_stateless = lrouter_nat_is_stateless(nat); char *error = ip_parse_masked(nat->external_ip, &ip, &mask); if (error || mask != OVS_BE32_MAX) { @@ -7117,15 +7130,26 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap *ports, if (!od->l3dgw_port) { /* Gateway router. */ ds_clear(&match); + ds_clear(&actions); ds_put_format(&match, "ip && ip4.dst == %s", nat->external_ip); + + if (!strcmp(nat->type, "dnat_and_snat") && is_stateless) { + ds_put_format(&actions, "ip4.dst=%s; next;", + nat->logical_ip); + } else { + ds_put_cstr(&actions, "ct_snat;"); + } + ovn_lflow_add(lflows, od, S_ROUTER_IN_UNSNAT, 90, - ds_cstr(&match), "ct_snat;"); + ds_cstr(&match), ds_cstr(&actions)); } else { /* Distributed router. */ /* Traffic received on l3dgw_port is subject to NAT. */ ds_clear(&match); + ds_clear(&actions); + ds_put_format(&match, "ip && ip4.dst == %s" " && inport == %s", nat->external_ip, @@ -7136,8 +7160,16 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap *ports, ds_put_format(&match, " && is_chassis_resident(%s)", od->l3redirect_port->json_key); } + + if (!strcmp(nat->type, "dnat_and_snat") && is_stateless) { + ds_put_format(&actions, "ip4.dst=%s; next;", + nat->logical_ip); + } else { + ds_put_cstr(&actions, "ct_snat;"); + } + ovn_lflow_add(lflows, od, S_ROUTER_IN_UNSNAT, 100, - ds_cstr(&match), "ct_snat;"); + ds_cstr(&match), ds_cstr(&actions)); /* Traffic received on other router ports must be * redirected to the central instance of the l3dgw_port @@ -7172,8 +7204,16 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap *ports, ds_put_format(&actions, "flags.force_snat_for_dnat = 1; "); } - ds_put_format(&actions, "flags.loopback = 1; ct_dnat(%s);", - nat->logical_ip); + + if (!strcmp(nat->type, "dnat_and_snat") && is_stateless) { + ds_put_format(&actions, "flags.loopback = 1; " + "ip4.dst=%s; next;", + nat->logical_ip); + } else { + ds_put_format(&actions, "flags.loopback = 1; ct_dnat(%s);", + nat->logical_ip); + } + ovn_lflow_add(lflows, od, S_ROUTER_IN_DNAT, 100, ds_cstr(&match), ds_cstr(&actions)); } else { @@ -7192,8 +7232,15 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap *ports, od->l3redirect_port->json_key); } ds_clear(&actions); - ds_put_format(&actions, "ct_dnat(%s);", - nat->logical_ip); + + if (!strcmp(nat->type, "dnat_and_snat") && is_stateless) { + ds_put_format(&actions, "ip4.dst=%s; next;", + nat->logical_ip); + } else { + ds_put_format(&actions, "ct_dnat(%s);", + nat->logical_ip); + } + ovn_lflow_add(lflows, od, S_ROUTER_IN_DNAT, 100, ds_cstr(&match), ds_cstr(&actions)); @@ -7235,7 +7282,14 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap *ports, ds_put_format(&actions, "eth.src = "ETH_ADDR_FMT"; ", ETH_ADDR_ARGS(mac)); } - ds_put_format(&actions, "ct_dnat;"); + + if (!strcmp(nat->type, "dnat_and_snat") && is_stateless) { + ds_put_format(&actions, "ip4.src=%s; next;", + nat->external_ip); + } else { + ds_put_format(&actions, "ct_dnat;"); + } + ovn_lflow_add(lflows, od, S_ROUTER_OUT_UNDNAT, 100, ds_cstr(&match), ds_cstr(&actions)); } @@ -7251,7 +7305,14 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap *ports, ds_put_format(&match, "ip && ip4.src == %s", nat->logical_ip); ds_clear(&actions); - ds_put_format(&actions, "ct_snat(%s);", nat->external_ip); + + if (!strcmp(nat->type, "dnat_and_snat") && is_stateless) { + ds_put_format(&actions, "ip4.src=%s; next;", + nat->external_ip); + } else { + ds_put_format(&actions, "ct_snat(%s);", + nat->external_ip); + } /* The priority here is calculated such that the * nat->logical_ip with the longest mask gets a higher @@ -7280,7 +7341,14 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap *ports, ds_put_format(&actions, "eth.src = "ETH_ADDR_FMT"; ", ETH_ADDR_ARGS(mac)); } - ds_put_format(&actions, "ct_snat(%s);", nat->external_ip); + + if (!strcmp(nat->type, "dnat_and_snat") && is_stateless) { + ds_put_format(&actions, "ip4.src=%s; next;", + nat->external_ip); + } else { + ds_put_format(&actions, "ct_snat(%s);", + nat->external_ip); + } /* The priority here is calculated such that the * nat->logical_ip with the longest mask gets a higher diff --git a/tests/ovn-northd.at b/tests/ovn-northd.at index 42033d5..64511a9 100644 --- a/tests/ovn-northd.at +++ b/tests/ovn-northd.at @@ -966,3 +966,53 @@ OVS_WAIT_UNTIL([ovn-sbctl get Port_Binding ${uuid} options:redirect-type], [0], ]) AT_CLEANUP + +AT_SETUP([ovn -- check stateless dnat_and_snat rule]) +AT_SKIP_IF([test $HAVE_PYTHON = no]) +ovn_start + +ovn-sbctl chassis-add gw1 geneve 127.0.0.1 + +ovn-nbctl lr-add R1 +ovn-nbctl lrp-add R1 R1-S1 02:ac:10:01:00:01 172.16.1.1/24 + +ovn-nbctl ls-add S1 +ovn-nbctl lsp-add S1 S1-R1 +ovn-nbctl lsp-set-type S1-R1 router +ovn-nbctl lsp-set-addresses S1-R1 router +ovn-nbctl --wait=sb lsp-set-options S1-R1 router-port=R1-S1 + +ovn-nbctl lrp-set-gateway-chassis R1-S1 gw1 + +uuid=`ovn-sbctl --columns=_uuid --bare find Port_Binding logical_port=cr-R1-S1` +echo "CR-LRP UUID is: " $uuid + +ovn-nbctl lr-nat-add R1 dnat_and_snat 172.16.1.1 50.0.0.11 +AT_CHECK([ovn-sbctl dump-flows R1 | grep ct_snat | wc -l], [0], [2 +]) + +AT_CHECK([ovn-sbctl dump-flows R1 | grep ct_dnat | wc -l], [0], [2 +]) + +AT_CHECK([ovn-sbctl dump-flows R1 | grep ip4.dst=| wc -l], [0], [0 +]) + +AT_CHECK([ovn-sbctl dump-flows R1 | grep ip4.src=| wc -l], [0], [0 +]) + +ovn-nbctl lr-nat-del R1 dnat_and_snat 172.16.1.1 + +ovn-nbctl --stateless lr-nat-add R1 dnat_and_snat 172.16.1.1 50.0.0.11 +AT_CHECK([ovn-sbctl dump-flows R1 | grep ct_snat | wc -l], [0], [0 +]) + +AT_CHECK([ovn-sbctl dump-flows R1 | grep ct_dnat | wc -l], [0], [0 +]) + +AT_CHECK([ovn-sbctl dump-flows R1 | grep ip4.dst=| wc -l], [0], [2 +]) + +AT_CHECK([ovn-sbctl dump-flows R1 | grep ip4.src=| wc -l], [0], [2 +]) + +AT_CLEANUP -- 1.8.3.1 _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
