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h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ZXjkueu+WDw47pdtgqB411Jm/7dSncUkCaRGXNsYOQIv33PjIrjW6QO0Bpn0Qpb40 1w9snEHihqhLNQm+4ww4gxjYL2/7ZS7qLo7iBhx6e3MetBAY6nHCDQ5ZTY0S29D81Y l+3XcYMFnfLTLm6Gforvhik5/bjr2IfEs7NdWDPrNKJnEUkwYVqq3X4eygUslbMeqV ZVa6LkfuqY4fNjoPDvf9yhXvEuTe9BcJBPkL5omIZctyzfTUS/+FnamlL39As8Cq0o gMH9ZGW0Y4PAfB16cK03pRGV/Ham9N/HIHIBBLIEtQ4grkvpugWGpTfOwjMHdK+hpe 2YJRxrsAMek7A== From: Martin Kalcok To: dceara@redhat.com, amusil@redhat.com, dev@openvswitch.org Date: Mon, 15 Apr 2024 14:14:14 +0200 Message-Id: <20240415121414.1024577-2-martin.kalcok@canonical.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240415121414.1024577-1-martin.kalcok@canonical.com> References: <20240415121414.1024577-1-martin.kalcok@canonical.com> MIME-Version: 1.0 Subject: [ovs-dev] [Patch ovn v3 2/2] northd: Fix direct access to SNAT network. X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" This change fixes bug that breaks ability of machines from external networks, to communicate with machines in SNATed networks (specifically when using a Distributed router). Currently when a machine (S1) on an external network tries to talk over TCP with a machine (A1) in a network that has enabled SNAT, the connection is established successfully. However after the three-way handshake, any packets that come from the A1 machine will have their source address translated by the Distributed router, breaking the communication. Existing rule in `build_lrouter_out_snat_flow` that decides which packets should be SNATed already tries to avoid SNATing packets in reply direction with `(!ct.trk || !ct.rpl)`. However, previous stages in the distributed LR egress pipeline do not initiate the CT state. Additionally we need to commit new connections that originate from external networks into CT, so that the packets in the reply direction (back to the external network) can be properly identified. Rationale: In my original RFC [0], there were questions about the motivation for fixing this issue. I'll try to summarize why I think this is a bug that should be fixed. 1. Current implementation for Distributed router already tries to avoid SNATing packets in the reply direction, it's just missing initialized CT states to make proper decisions. 2. This same scenario works with Gateway Router. I tested with following setup: foo -- R1 -- join - R3 -- alice | bar ----------R2 R1 is a Distributed router with SNAT for foo. R2 is a Gateway router with SNAT for bar. R3 is a Gateway router with no SNAT. Using 'alice1' as a client I was able to talk over TCP with 'bar1' but connection with 'foo1' failed. 3. Regarding security and "leaking" of internal IPs. Reading through RFC 4787 [1], 5382 [2] and their update in 7857 [3], the specifications do not seem to mandate that SNAT implementations must filter incoming traffic destined directly to the internal network. Sections like "5. Filtering Behavior" in 4787 and "4.3 Externally Initiated Connections" in 5382 describe only behavior for traffic destined to external IP/Port associated with NAT on the device that performs NAT. Besides, with the current implementation, it's already possible to scan the internal network with pings and TCP syn scanning. 4. We do have customers/clouds that depend on this functionality. This is a scenario that used to work in Openstack with ML2/OVS and migrating those clouds to ML2/OVN would break it. [0]https://mail.openvswitch.org/pipermail/ovs-dev/2024-February/411670.html [1]https://datatracker.ietf.org/doc/html/rfc4787 [2]https://datatracker.ietf.org/doc/html/rfc5382 [3]https://datatracker.ietf.org/doc/html/rfc7857 Signed-off-by: Martin Kalcok --- northd/northd.c | 66 ++++++++++++++++++++++++++++------- northd/ovn-northd.8.xml | 29 ++++++++++++++++ tests/ovn-northd.at | 76 +++++++++++++++++++++++++++++++++++++---- tests/system-ovn.at | 68 ++++++++++++++++++++++++++++++++++++ 4 files changed, 220 insertions(+), 19 deletions(-) diff --git a/northd/northd.c b/northd/northd.c index 02cf5b234..0726c8429 100644 --- a/northd/northd.c +++ b/northd/northd.c @@ -14413,20 +14413,27 @@ build_lrouter_out_is_dnat_local(struct lflow_table *lflows, static void build_lrouter_out_snat_match(struct lflow_table *lflows, - const struct ovn_datapath *od, - const struct nbrec_nat *nat, struct ds *match, - bool distributed_nat, int cidr_bits, bool is_v6, - struct ovn_port *l3dgw_port, - struct lflow_ref *lflow_ref) + const struct ovn_datapath *od, + const struct nbrec_nat *nat, + struct ds *match, + bool distributed_nat, int cidr_bits, + bool is_v6, + struct ovn_port *l3dgw_port, + struct lflow_ref *lflow_ref, + bool is_reverse) { ds_clear(match); - ds_put_format(match, "ip && ip%c.src == %s", is_v6 ? '6' : '4', + ds_put_format(match, "ip && ip%c.%s == %s", + is_v6 ? '6' : '4', + is_reverse ? "dst" : "src", nat->logical_ip); if (!od->is_gw_router) { /* Distributed router. */ - ds_put_format(match, " && outport == %s", l3dgw_port->json_key); + ds_put_format(match, " && %s == %s", + is_reverse ? "inport" : "outport", + l3dgw_port->json_key); if (od->n_l3dgw_ports) { ds_put_format(match, " && is_chassis_resident(\"%s\")", distributed_nat @@ -14437,7 +14444,7 @@ build_lrouter_out_snat_match(struct lflow_table *lflows, if (nat->allowed_ext_ips || nat->exempted_ext_ips) { lrouter_nat_add_ext_ip_match(od, lflows, match, nat, - is_v6, false, cidr_bits, + is_v6, is_reverse, cidr_bits, lflow_ref); } } @@ -14464,7 +14471,8 @@ build_lrouter_out_snat_stateless_flow(struct lflow_table *lflows, uint16_t priority = cidr_bits + 1; build_lrouter_out_snat_match(lflows, od, nat, match, distributed_nat, - cidr_bits, is_v6, l3dgw_port, lflow_ref); + cidr_bits, is_v6, l3dgw_port, lflow_ref, + false); if (!od->is_gw_router) { /* Distributed router. */ @@ -14511,7 +14519,7 @@ build_lrouter_out_snat_in_czone_flow(struct lflow_table *lflows, build_lrouter_out_snat_match(lflows, od, nat, match, distributed_nat, cidr_bits, is_v6, l3dgw_port, - lflow_ref); + lflow_ref, false); if (od->n_l3dgw_ports) { priority += 128; @@ -14560,7 +14568,8 @@ build_lrouter_out_snat_flow(struct lflow_table *lflows, struct ds *actions, bool distributed_nat, struct eth_addr mac, int cidr_bits, bool is_v6, struct ovn_port *l3dgw_port, - struct lflow_ref *lflow_ref) + struct lflow_ref *lflow_ref, + const struct chassis_features *features) { if (strcmp(nat->type, "snat") && strcmp(nat->type, "dnat_and_snat")) { return; @@ -14574,7 +14583,9 @@ build_lrouter_out_snat_flow(struct lflow_table *lflows, uint16_t priority = cidr_bits + 1; build_lrouter_out_snat_match(lflows, od, nat, match, distributed_nat, - cidr_bits, is_v6, l3dgw_port, lflow_ref); + cidr_bits, is_v6, l3dgw_port, lflow_ref, + false); + size_t original_match_len = match->length; if (!od->is_gw_router) { /* Distributed router. */ @@ -14599,6 +14610,35 @@ build_lrouter_out_snat_flow(struct lflow_table *lflows, priority, ds_cstr(match), ds_cstr(actions), &nat->header_, lflow_ref); + + /* For the SNAT networks, we need to make sure that connections are + * properly tracked so we can decide whether to perform SNAT on traffic + * exiting the network. */ + if (features->ct_commit_to_zone && !strcmp(nat->type, "snat") && + !od->is_gw_router) { + /* For traffic that comes from SNAT network, initiate CT state before + * entering S_ROUTER_OUT_SNAT to allow matching on various CT states. + */ + ds_truncate(match, original_match_len); + ovn_lflow_add(lflows, od, S_ROUTER_OUT_POST_UNDNAT, 70, + ds_cstr(match), "ct_snat; ", + lflow_ref); + + build_lrouter_out_snat_match(lflows, od, nat, match, + distributed_nat, cidr_bits, is_v6, + l3dgw_port, lflow_ref, true); + + /* New traffic that goes into SNAT network is committed to CT to avoid + * SNAT-ing replies.*/ + ovn_lflow_add(lflows, od, S_ROUTER_OUT_SNAT, priority, + ds_cstr(match), "ct_snat;", + lflow_ref); + + ds_put_cstr(match, " && ct.new"); + ovn_lflow_add(lflows, od, S_ROUTER_OUT_POST_SNAT, priority, + ds_cstr(match), "ct_commit_to_zone(snat); next; ", + lflow_ref); + } } static void @@ -15137,7 +15177,7 @@ build_lrouter_nat_defrag_and_lb( } else { build_lrouter_out_snat_flow(lflows, od, nat, match, actions, distributed_nat, mac, cidr_bits, is_v6, - l3dgw_port, lflow_ref); + l3dgw_port, lflow_ref, features); } /* S_ROUTER_IN_ADMISSION - S_ROUTER_IN_IP_INPUT */ diff --git a/northd/ovn-northd.8.xml b/northd/ovn-northd.8.xml index 90ce0de3f..93a0b781a 100644 --- a/northd/ovn-northd.8.xml +++ b/northd/ovn-northd.8.xml @@ -4876,6 +4876,13 @@ nd_ns {

    +
  • + A priority-70 logical flow is added that initiates CT state for + traffic that is configured to be SNATed on Distributed routers. + This allows the next table, lr_out_snat, to + effectively match on various CT states. +
    • +
  • A priority-50 logical flow is added that commits any untracked flows from the previous table lr_out_undnat for Gateway @@ -5068,6 +5075,18 @@ nd_ns {
    • +
  • + An additional flow is added for traffic that goes in opposite + direction (i.e. it enters a network with configured SNAT). Where the + flow above matched on ip4.src == A && outport + == GW, this flow matches on ip4.dst == + A && inport == GW. A CT state is + initiated for this traffic so that the following table, + lr_out_post_snat, can identify whether the traffic flow was + initiated from the internal or external network. + +
    • +
  • A priority-0 logical flow with match 1 has actions next;. @@ -5079,6 +5098,16 @@ nd_ns {

    Packets reaching this table are processed according to the flows below:

      +
    • + Traffic that goes directly into a network configured with SNAT on + Distributed routers, and was initiated from an external network (i.e. + it matches ct.new), is committed to the SNAT CT zone. + This ensures that replies returning from the SNATed network do not + have their source address translated. For details about match rules + and priority see section "Egress Table 3: SNAT on Distributed + Routers". +
      • +
    • A priority-0 logical flow that matches all packets not already handled (match 1) and action next;. diff --git a/tests/ovn-northd.at b/tests/ovn-northd.at index be006fb32..3c9d9309b 100644 --- a/tests/ovn-northd.at +++ b/tests/ovn-northd.at @@ -1107,7 +1107,8 @@ ovn_start # # DR is connected to S1 and CR is connected to S2 -check ovn-sbctl chassis-add gw1 geneve 127.0.0.1 +check ovn-sbctl chassis-add gw1 geneve 127.0.0.1 \ + -- set chassis gw1 other_config:ct-commit-to-zone="true" check ovn-nbctl lr-add DR check ovn-nbctl lrp-add DR DR-S1 02:ac:10:01:00:01 172.16.1.1/24 @@ -1155,15 +1156,24 @@ AT_CAPTURE_FILE([crflows]) AT_CHECK([grep -e "lr_out_snat" drflows | ovn_strip_lflows], [0], [dnl table=??(lr_out_snat ), priority=0 , match=(1), action=(next;) table=??(lr_out_snat ), priority=120 , match=(nd_ns), action=(next;) + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.dst == 50.0.0.11 && inport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ip4.src == $allowed_range), action=(ct_snat;) table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src == 50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ip4.dst == $allowed_range && (!ct.trk || !ct.rpl)), action=(ct_snat(172.16.1.1);) ]) +AT_CHECK([grep -e "lr_out_post_snat" drflows | ovn_strip_lflows], [0], [dnl + table=??(lr_out_post_snat ), priority=0 , match=(1), action=(next;) + table=??(lr_out_post_snat ), priority=161 , match=(ip && ip4.dst == 50.0.0.11 && inport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ip4.src == $allowed_range && ct.new), action=(ct_commit_to_zone(snat); next; ) +]) + AT_CHECK([grep -e "lr_out_snat" crflows | ovn_strip_lflows], [0], [dnl table=??(lr_out_snat ), priority=0 , match=(1), action=(next;) table=??(lr_out_snat ), priority=120 , match=(nd_ns), action=(next;) table=??(lr_out_snat ), priority=33 , match=(ip && ip4.src == 50.0.0.11 && ip4.dst == $allowed_range && (!ct.trk || !ct.rpl)), action=(ct_snat(172.16.1.1);) ]) +AT_CHECK([grep -e "lr_out_post_snat" crflows | ovn_strip_lflows], [0], [dnl + table=??(lr_out_post_snat ), priority=0 , match=(1), action=(next;) +]) # SNAT with DISALLOWED_IPs check ovn-nbctl lr-nat-del DR snat 50.0.0.11 @@ -1185,10 +1195,16 @@ AT_CAPTURE_FILE([crflows2]) AT_CHECK([grep -e "lr_out_snat" drflows2 | ovn_strip_lflows], [0], [dnl table=??(lr_out_snat ), priority=0 , match=(1), action=(next;) table=??(lr_out_snat ), priority=120 , match=(nd_ns), action=(next;) + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.dst == 50.0.0.11 && inport == "DR-S1" && is_chassis_resident("cr-DR-S1")), action=(ct_snat;) table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src == 50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") && (!ct.trk || !ct.rpl)), action=(ct_snat(172.16.1.1);) table=??(lr_out_snat ), priority=163 , match=(ip && ip4.src == 50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ip4.dst == $disallowed_range), action=(next;) ]) +AT_CHECK([grep -e "lr_out_post_snat" drflows2 | ovn_strip_lflows], [0], [dnl + table=??(lr_out_post_snat ), priority=0 , match=(1), action=(next;) + table=??(lr_out_post_snat ), priority=161 , match=(ip && ip4.dst == 50.0.0.11 && inport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ct.new), action=(ct_commit_to_zone(snat); next; ) +]) + AT_CHECK([grep -e "lr_out_snat" crflows2 | ovn_strip_lflows], [0], [dnl table=??(lr_out_snat ), priority=0 , match=(1), action=(next;) table=??(lr_out_snat ), priority=120 , match=(nd_ns), action=(next;) @@ -1196,6 +1212,10 @@ AT_CHECK([grep -e "lr_out_snat" crflows2 | ovn_strip_lflows], [0], [dnl table=??(lr_out_snat ), priority=35 , match=(ip && ip4.src == 50.0.0.11 && ip4.dst == $disallowed_range), action=(next;) ]) +AT_CHECK([grep -e "lr_out_post_snat" crflows2 | ovn_strip_lflows], [0], [dnl + table=??(lr_out_post_snat ), priority=0 , match=(1), action=(next;) +]) + # Stateful FIP with ALLOWED_IPs check ovn-nbctl lr-nat-del DR snat 50.0.0.11 check ovn-nbctl lr-nat-del CR snat 50.0.0.11 @@ -1217,12 +1237,20 @@ AT_CHECK([grep -e "lr_out_snat" drflows3 | ovn_strip_lflows], [0], [dnl table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src == 50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ip4.dst == $allowed_range && (!ct.trk || !ct.rpl)), action=(ct_snat(172.16.1.2);) ]) +AT_CHECK([grep -e "lr_out_post_snat" drflows3 | ovn_strip_lflows], [0], [dnl + table=??(lr_out_post_snat ), priority=0 , match=(1), action=(next;) +]) + AT_CHECK([grep -e "lr_out_snat" crflows3 | ovn_strip_lflows], [0], [dnl table=??(lr_out_snat ), priority=0 , match=(1), action=(next;) table=??(lr_out_snat ), priority=120 , match=(nd_ns), action=(next;) table=??(lr_out_snat ), priority=33 , match=(ip && ip4.src == 50.0.0.11 && ip4.dst == $allowed_range && (!ct.trk || !ct.rpl)), action=(ct_snat(172.16.1.2);) ]) +AT_CHECK([grep -e "lr_out_post_snat" crflows3 | ovn_strip_lflows], [0], [dnl + table=??(lr_out_post_snat ), priority=0 , match=(1), action=(next;) +]) + # Stateful FIP with DISALLOWED_IPs ovn-nbctl lr-nat-del DR dnat_and_snat 172.16.1.2 ovn-nbctl lr-nat-del CR dnat_and_snat 172.16.1.2 @@ -1279,7 +1307,7 @@ AT_CHECK([grep -e "lr_out_snat" crflows5 | ovn_strip_lflows], [0], [dnl table=??(lr_out_snat ), priority=33 , match=(ip && ip4.src == 50.0.0.11 && ip4.dst == $allowed_range), action=(ip4.src=172.16.1.2; next;) ]) -# Stateful FIP with DISALLOWED_IPs +# Stateless FIP with DISALLOWED_IPs ovn-nbctl lr-nat-del DR dnat_and_snat 172.16.1.2 ovn-nbctl lr-nat-del CR dnat_and_snat 172.16.1.2 @@ -5521,7 +5549,8 @@ AT_CHECK([grep "lr_out_snat" lr0flows | ovn_strip_lflows], [0], [dnl check ovn-sbctl chassis-add gw1 geneve 127.0.0.1 \ -- set chassis gw1 other_config:ct-no-masked-label="true" \ - -- set chassis gw1 other_config:ovn-ct-lb-related="true" + -- set chassis gw1 other_config:ovn-ct-lb-related="true" \ + -- set chassis gw1 other_config:ct-commit-to-zone="true" # Create a distributed gw port on lr0 check ovn-nbctl ls-add public @@ -5622,16 +5651,26 @@ AT_CHECK([grep "lr_out_undnat" lr0flows | ovn_strip_lflows], [0], [dnl AT_CHECK([grep "lr_out_post_undnat" lr0flows | ovn_strip_lflows], [0], [dnl table=??(lr_out_post_undnat ), priority=0 , match=(1), action=(next;) + table=??(lr_out_post_undnat ), priority=70 , match=(ip && ip4.src == 10.0.0.0/24 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(ct_snat; ) + table=??(lr_out_post_undnat ), priority=70 , match=(ip && ip4.src == 10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(ct_snat; ) ]) AT_CHECK([grep "lr_out_snat" lr0flows | ovn_strip_lflows], [0], [dnl table=??(lr_out_snat ), priority=0 , match=(1), action=(next;) table=??(lr_out_snat ), priority=120 , match=(nd_ns), action=(next;) + table=??(lr_out_snat ), priority=153 , match=(ip && ip4.dst == 10.0.0.0/24 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(ct_snat;) table=??(lr_out_snat ), priority=153 , match=(ip && ip4.src == 10.0.0.0/24 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public") && (!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.10);) + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.dst == 10.0.0.10 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(ct_snat;) table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src == 10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public") && (!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.30);) table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src == 10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public") && (!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.20);) ]) +AT_CHECK([grep "lr_out_post_snat" lr0flows | ovn_strip_lflows], [0], [dnl + table=??(lr_out_post_snat ), priority=0 , match=(1), action=(next;) + table=??(lr_out_post_snat ), priority=153 , match=(ip && ip4.dst == 10.0.0.0/24 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public") && ct.new), action=(ct_commit_to_zone(snat); next; ) + table=??(lr_out_post_snat ), priority=161 , match=(ip && ip4.dst == 10.0.0.10 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public") && ct.new), action=(ct_commit_to_zone(snat); next; ) +]) + # Associate load balancer to lr0 check ovn-nbctl lb-add lb0 172.168.0.100:8082 "10.0.0.50:82,10.0.0.60:82" @@ -5770,16 +5809,26 @@ AT_CHECK([grep "lr_out_undnat" lr0flows | ovn_strip_lflows], [0], [dnl AT_CHECK([grep "lr_out_post_undnat" lr0flows | ovn_strip_lflows], [0], [dnl table=??(lr_out_post_undnat ), priority=0 , match=(1), action=(next;) + table=??(lr_out_post_undnat ), priority=70 , match=(ip && ip4.src == 10.0.0.0/24 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(ct_snat; ) + table=??(lr_out_post_undnat ), priority=70 , match=(ip && ip4.src == 10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(ct_snat; ) ]) AT_CHECK([grep "lr_out_snat" lr0flows | ovn_strip_lflows], [0], [dnl table=??(lr_out_snat ), priority=0 , match=(1), action=(next;) table=??(lr_out_snat ), priority=120 , match=(nd_ns), action=(next;) + table=??(lr_out_snat ), priority=153 , match=(ip && ip4.dst == 10.0.0.0/24 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(ct_snat;) table=??(lr_out_snat ), priority=153 , match=(ip && ip4.src == 10.0.0.0/24 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public") && (!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.10);) + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.dst == 10.0.0.10 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(ct_snat;) table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src == 10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public") && (!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.30);) table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src == 10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public") && (!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.20);) ]) +AT_CHECK([grep "lr_out_post_snat" lr0flows | ovn_strip_lflows], [0], [dnl + table=??(lr_out_post_snat ), priority=0 , match=(1), action=(next;) + table=??(lr_out_post_snat ), priority=153 , match=(ip && ip4.dst == 10.0.0.0/24 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public") && ct.new), action=(ct_commit_to_zone(snat); next; ) + table=??(lr_out_post_snat ), priority=161 , match=(ip && ip4.dst == 10.0.0.10 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public") && ct.new), action=(ct_commit_to_zone(snat); next; ) +]) + # Make the logical router as Gateway router check ovn-nbctl clear logical_router_port lr0-public gateway_chassis check ovn-nbctl set logical_router lr0 options:chassis=gw1 @@ -7606,9 +7655,14 @@ ovn_start # Validate SNAT, DNAT and DNAT_AND_SNAT behavior with multiple # distributed gateway LRPs. -check ovn-sbctl chassis-add gw1 geneve 127.0.0.1 -check ovn-sbctl chassis-add gw2 geneve 128.0.0.1 -check ovn-sbctl chassis-add gw3 geneve 129.0.0.1 +check ovn-sbctl chassis-add gw1 geneve 127.0.0.1 \ + -- set chassis gw1 other_config:ct-commit-to-zone="true" + +check ovn-sbctl chassis-add gw2 geneve 128.0.0.1 \ + -- set chassis gw2 other_config:ct-commit-to-zone="true" + +check ovn-sbctl chassis-add gw3 geneve 129.0.0.1 \ + -- set chassis gw3 other_config:ct-commit-to-zone="true" check ovn-nbctl lr-add DR check ovn-nbctl lrp-add DR DR-S1 02:ac:10:01:00:01 172.16.1.1/24 @@ -7673,11 +7727,21 @@ AT_CHECK([grep lr_in_unsnat lrflows | grep ct_snat | ovn_strip_lflows], [0], [dn ]) AT_CHECK([grep lr_out_snat lrflows | grep ct_snat | ovn_strip_lflows], [0], [dnl + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.dst == 20.0.0.10 && inport == "DR-S1" && is_chassis_resident("cr-DR-S1")), action=(ct_snat;) + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.dst == 20.0.0.10 && inport == "DR-S2" && is_chassis_resident("cr-DR-S2")), action=(ct_snat;) + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.dst == 20.0.0.10 && inport == "DR-S3" && is_chassis_resident("cr-DR-S3")), action=(ct_snat;) table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src == 20.0.0.10 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") && (!ct.trk || !ct.rpl)), action=(ct_snat(172.16.1.10);) table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src == 20.0.0.10 && outport == "DR-S2" && is_chassis_resident("cr-DR-S2") && (!ct.trk || !ct.rpl)), action=(ct_snat(10.0.0.10);) table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src == 20.0.0.10 && outport == "DR-S3" && is_chassis_resident("cr-DR-S3") && (!ct.trk || !ct.rpl)), action=(ct_snat(192.168.0.10);) ]) +AT_CHECK([grep lr_out_post_snat lrflows | ovn_strip_lflows], [0], [dnl + table=??(lr_out_post_snat ), priority=0 , match=(1), action=(next;) + table=??(lr_out_post_snat ), priority=161 , match=(ip && ip4.dst == 20.0.0.10 && inport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ct.new), action=(ct_commit_to_zone(snat); next; ) + table=??(lr_out_post_snat ), priority=161 , match=(ip && ip4.dst == 20.0.0.10 && inport == "DR-S2" && is_chassis_resident("cr-DR-S2") && ct.new), action=(ct_commit_to_zone(snat); next; ) + table=??(lr_out_post_snat ), priority=161 , match=(ip && ip4.dst == 20.0.0.10 && inport == "DR-S3" && is_chassis_resident("cr-DR-S3") && ct.new), action=(ct_commit_to_zone(snat); next; ) +]) + check ovn-nbctl --wait=sb lr-nat-del DR snat 20.0.0.10 AT_CHECK([ovn-sbctl dump-flows DR | grep -e lr_in_unsnat -e lr_out_snat | grep ct_snat | wc -l], [0], [0 ]) diff --git a/tests/system-ovn.at b/tests/system-ovn.at index c699f7960..68adfa4e6 100644 --- a/tests/system-ovn.at +++ b/tests/system-ovn.at @@ -3574,6 +3574,39 @@ NS_CHECK_EXEC([foo1], [ping -q -c 3 -i 0.3 -w 2 10.0.0.1 | FORMAT_PING], \ 3 packets transmitted, 3 received, 0% packet loss, time 0ms ]) +# test_connectivity_from_ext takes parameters 'vm' and 'ip'. It tests +# icmp, udp and tcp connectivity from external network to the 'vm' on +# the specified 'ip'. +test_connectivity_from_ext() { + local vm=$1; shift + local ip=$1; shift + + # Start listening daemons for UDP and TCP connections + NETNS_DAEMONIZE($vm, [nc -l -u 1234], [nc-$vm-$ip-udp.pid]) + NETNS_DAEMONIZE($vm, [nc -l -k 1235], [nc-$vm-$ip-tcp.pid]) + + # Ensure that vm can be pinged on the specified IP + NS_CHECK_EXEC([alice1], [ping -q -c 3 -i 0.3 -w 2 $ip | FORMAT_PING], \ + [0], [dnl +3 packets transmitted, 3 received, 0% packet loss, time 0ms +]) + + # Perform two consecutive UDP connections to the specified IP + NS_CHECK_EXEC([alice1], [nc -u $ip 1234 -p 2000 -z]) + NS_CHECK_EXEC([alice1], [nc -u $ip 1234 -p 2000 -z]) + + # Send data over TCP connection to the specified IP + NS_CHECK_EXEC([alice1], [echo "TCP test" | nc --send-only $ip 1235]) +} + +# Test access from external network to the internal IP of a VM that +# has also configured DNAT +test_connectivity_from_ext foo1 192.168.1.2 + +# Test access from external network to the internal IP of a VM that +# does not have DNAT +test_connectivity_from_ext bar1 192.168.2.2 + OVS_WAIT_UNTIL([ total_pkts=$(cat ext-net.tcpdump | wc -l) test "${total_pkts}" = "3" @@ -3740,6 +3773,39 @@ sed -e 's/zone=[[0-9]]*/zone=/'], [0], [dnl icmpv6,orig=(src=fd12::2,dst=fd20::2,id=,type=128,code=0),reply=(src=fd20::2,dst=fd20::1,id=,type=129,code=0),zone= ]) +# test_connectivity_from_ext takes parameters 'vm' and 'ip'. It tests +# icmp, udp and tcp connectivity from external network to the 'vm' on +# the specified 'ip'. +test_connectivity_from_ext() { + local vm=$1; shift + local ip=$1; shift + + # Start listening daemons for UDP and TCP connections + NETNS_DAEMONIZE($vm, [nc -l -u 1234], [nc-$vm-$ip-udp.pid]) + NETNS_DAEMONIZE($vm, [nc -l -k 1235], [nc-$vm-$ip-tcp.pid]) + + # Ensure that vm can be pinged on the specified IP + NS_CHECK_EXEC([alice1], [ping -q -c 3 -i 0.3 -w 2 $ip | FORMAT_PING], \ + [0], [dnl +3 packets transmitted, 3 received, 0% packet loss, time 0ms +]) + + # Perform two consecutive UDP connections to the specified IP + NS_CHECK_EXEC([alice1], [nc -u $ip 1234 -p 2000 -z]) + NS_CHECK_EXEC([alice1], [nc -u $ip 1234 -p 2000 -z]) + + # Send data over TCP connection to the specified IP + NS_CHECK_EXEC([alice1], [echo "TCP test" | nc --send-only $ip 1235]) +} + +# Test access from external network to the internal IP of a VM that +# has also configured DNAT +test_connectivity_from_ext foo1 fd11::2 + +# Test access from external network to the internal IP of a VM that +# does not have DNAT +test_connectivity_from_ext bar1 fd12::2 + OVS_APP_EXIT_AND_WAIT([ovn-controller]) as ovn-sb @@ -3920,6 +3986,7 @@ NS_CHECK_EXEC([foo2], [ping -q -c 3 -i 0.3 -w 2 172.16.1.4 | FORMAT_PING], \ AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep icmp | FORMAT_CT(172.16.1.1) | \ sed -e 's/zone=[[0-9]]*/zone=/'], [0], [dnl icmp,orig=(src=172.16.1.1,dst=172.16.1.4,id=,type=8,code=0),reply=(src=192.168.2.2,dst=172.16.1.1,id=,type=0,code=0),zone= +icmp,orig=(src=172.16.1.1,dst=192.168.2.2,id=,type=8,code=0),reply=(src=192.168.2.2,dst=172.16.1.1,id=,type=0,code=0),zone= icmp,orig=(src=192.168.1.3,dst=172.16.1.4,id=,type=8,code=0),reply=(src=172.16.1.4,dst=172.16.1.1,id=,type=0,code=0),zone= ]) @@ -4088,6 +4155,7 @@ NS_CHECK_EXEC([foo2], [ping -q -c 3 -i 0.3 -w 2 fd20::4 | FORMAT_PING], \ AT_CHECK([ovs-appctl dpctl/dump-conntrack | FORMAT_CT(fd20::1) | \ sed -e 's/zone=[[0-9]]*/zone=/'], [0], [dnl icmpv6,orig=(src=fd11::3,dst=fd20::4,id=,type=128,code=0),reply=(src=fd20::4,dst=fd20::1,id=,type=129,code=0),zone= +icmpv6,orig=(src=fd20::1,dst=fd12::2,id=,type=128,code=0),reply=(src=fd12::2,dst=fd20::1,id=,type=129,code=0),zone= icmpv6,orig=(src=fd20::1,dst=fd20::4,id=,type=128,code=0),reply=(src=fd12::2,dst=fd20::1,id=,type=129,code=0),zone= ])