Curreently in order to flush conntrack you would need to specify full 5-tuple. Add support for partial match it still has some limitations however it is capable of flushing all that match specified field e.g. source ip address.
Reported-at: https://bugzilla.redhat.com/2120546 Signed-off-by: Ales Musil <amu...@redhat.com> --- NEWS | 2 + lib/ct-dpif.c | 178 +++++++++++++++++++++++++++++++--------- lib/dpctl.man | 3 +- tests/system-traffic.at | 84 ++++++++++++++++++- 4 files changed, 226 insertions(+), 41 deletions(-) diff --git a/NEWS b/NEWS index ff77ee404..81909812e 100644 --- a/NEWS +++ b/NEWS @@ -23,6 +23,8 @@ Post-v3.0.0 bug and CVE fixes addressed since its release. If a user wishes to benefit from these fixes it is recommended to use DPDK 21.11.2. + - ovs-dpctl and related ovs-appctl commands: + * "flush-conntrack" is capable of handling partial 5-tuple. v3.0.0 - 15 Aug 2022 diff --git a/lib/ct-dpif.c b/lib/ct-dpif.c index cfc2315e3..57995f5e5 100644 --- a/lib/ct-dpif.c +++ b/lib/ct-dpif.c @@ -18,6 +18,8 @@ #include "dpif-provider.h" #include <errno.h> +#include <sys/types.h> +#include <netinet/in.h> #include "ct-dpif.h" #include "openvswitch/ofp-parse.h" @@ -109,7 +111,113 @@ ct_dpif_dump_done(struct ct_dpif_dump_state *dump) ? dpif->dpif_class->ct_dump_done(dpif, dump) : EOPNOTSUPP); } - + +static inline bool +ct_dpif_inet_addr_cmp_partial(const union ct_dpif_inet_addr *partial, + const union ct_dpif_inet_addr *addr) +{ + if (!ipv6_is_zero(&partial->in6) && + !ipv6_addr_equals(&partial->in6, &addr->in6)) { + return false; + } + return true; +} + +/* Compares the non-zero members if they match. This is usefull for clearing + * up all conntracks specified by a partial tuple. */ +static inline bool +ct_dpif_tuple_cmp_partial(const struct ct_dpif_tuple *partial, + const struct ct_dpif_tuple *tuple) +{ + /* There is no point in continuing if both do not use the same eth type. */ + if (partial->l3_type != tuple->l3_type) { + return false; + } + + if (partial->ip_proto && partial->ip_proto != tuple->ip_proto) { + return false; + } + + if (!ct_dpif_inet_addr_cmp_partial(&partial->src, &tuple->src)) { + return false; + } + + if (!ct_dpif_inet_addr_cmp_partial(&partial->dst, &tuple->dst)) { + return false; + } + + if (partial->ip_proto == IPPROTO_TCP || partial->ip_proto == IPPROTO_UDP) { + + if (partial->src_port && partial->src_port != tuple->src_port) { + return false; + } + + if (partial->dst_port && partial->dst_port != tuple->dst_port) { + return false; + } + } else if (partial->ip_proto == IPPROTO_ICMP || + partial->ip_proto == IPPROTO_ICMPV6) { + + if (partial->icmp_id != tuple->icmp_id) { + return false; + } + + if (partial->icmp_type != tuple->icmp_type) { + return false; + } + + if (partial->icmp_code != tuple->icmp_code) { + return false; + } + } + + return true; +} + +static int +ct_dpif_flush_tuple(struct dpif *dpif, const uint16_t *zone, + const struct ct_dpif_tuple *tuple) { + struct ct_dpif_dump_state *dump; + struct ct_dpif_entry cte; + int error; + int tot_bkts; + + if (!dpif->dpif_class->ct_flush) { + return EOPNOTSUPP; + } + + if (VLOG_IS_DBG_ENABLED()) { + struct ds ds = DS_EMPTY_INITIALIZER; + ct_dpif_format_tuple(&ds, tuple); + VLOG_DBG("%s: ct_flush: %s in zone %d", dpif_name(dpif), ds_cstr(&ds), + zone ? *zone : 0); + ds_destroy(&ds); + } + + error = ct_dpif_dump_start(dpif, &dump, zone, &tot_bkts); + if (error) { + return error; + } + + while (!(error = ct_dpif_dump_next(dump, &cte))) { + if (zone && *zone != cte.zone) { + continue; + } + + if (ct_dpif_tuple_cmp_partial(tuple, &cte.tuple_orig)) { + error = dpif->dpif_class->ct_flush(dpif, &cte.zone, + &cte.tuple_orig); + if (error) { + break; + } + } + } + if (error == EOF) { + error = 0; + } + ct_dpif_dump_done(dump); + return error; +} /* Flush the entries in the connection tracker used by 'dpif'. The * arguments have the following behavior: * @@ -123,11 +231,7 @@ ct_dpif_flush(struct dpif *dpif, const uint16_t *zone, const struct ct_dpif_tuple *tuple) { if (tuple) { - struct ds ds = DS_EMPTY_INITIALIZER; - ct_dpif_format_tuple(&ds, tuple); - VLOG_DBG("%s: ct_flush: %s in zone %d", dpif_name(dpif), ds_cstr(&ds), - zone ? *zone : 0); - ds_destroy(&ds); + return ct_dpif_flush_tuple(dpif, zone, tuple); } else if (zone) { VLOG_DBG("%s: ct_flush: zone %"PRIu16, dpif_name(dpif), *zone); } else { @@ -581,6 +685,21 @@ ct_dpif_format_tcp_stat(struct ds * ds, int tcp_state, int conn_per_state) ds_put_format(ds, "=%u", conn_per_state); } +static bool +ct_dpif_parse_tuple_ip(union ct_dpif_inet_addr *addr, char *value, + uint16_t l3_type) +{ + if (!ipv6_is_zero(&addr->in6)) { + return false; + } + if (l3_type == AF_INET) { + ip_parse(value, &addr->ip); + } else { + ipv6_parse(value, &addr->in6); + } + return true; +} + /* Parses a specification of a conntrack 5-tuple from 's' into 'tuple'. * Returns true on success. Otherwise, returns false and puts the error * message in 'ds'. */ @@ -590,6 +709,8 @@ ct_dpif_parse_tuple(struct ct_dpif_tuple *tuple, const char *s, struct ds *ds) char *pos, *key, *value, *copy; memset(tuple, 0, sizeof *tuple); + tuple->l3_type = AF_INET; + pos = copy = xstrdup(s); while (ofputil_parse_key_value(&pos, &key, &value)) { if (!*value) { @@ -597,28 +718,17 @@ ct_dpif_parse_tuple(struct ct_dpif_tuple *tuple, const char *s, struct ds *ds) goto error; } - if (!strcmp(key, "ct_nw_src") || !strcmp(key, "ct_nw_dst")) { - if (tuple->l3_type && tuple->l3_type != AF_INET) { - ds_put_cstr(ds, "L3 type set multiple times"); - goto error; - } else { - tuple->l3_type = AF_INET; - } - if (!ip_parse(value, key[6] == 's' ? &tuple->src.ip : - &tuple->dst.ip)) { - goto error_with_msg; - } - } else if (!strcmp(key, "ct_ipv6_src") || - !strcmp(key, "ct_ipv6_dst")) { - if (tuple->l3_type && tuple->l3_type != AF_INET6) { - ds_put_cstr(ds, "L3 type set multiple times"); + if (!strcmp(key, "ct_nw_src") || !strcmp(key, "ct_nw_dst") || + !strcmp(key, "ct_ipv6_src") || !strcmp(key, "ct_ipv6_dst")) { + tuple->l3_type = key[6] == '6' ? AF_INET6 : AF_INET; + uint8_t index = key[6] == '6' ? 8 : 6; + union ct_dpif_inet_addr *addr = key[index] == 's' + ? &tuple->src + : &tuple->dst; + + if (!ct_dpif_parse_tuple_ip(addr, value, tuple->l3_type)) { + ds_put_format(ds, "%s is set multiple times", key); goto error; - } else { - tuple->l3_type = AF_INET6; - } - if (!ipv6_parse(value, key[8] == 's' ? &tuple->src.in6 : - &tuple->dst.in6)) { - goto error_with_msg; } } else if (!strcmp(key, "ct_nw_proto")) { char *err = str_to_u8(value, key, &tuple->ip_proto); @@ -665,17 +775,9 @@ ct_dpif_parse_tuple(struct ct_dpif_tuple *tuple, const char *s, struct ds *ds) } } - if (ipv6_is_zero(&tuple->src.in6) || ipv6_is_zero(&tuple->dst.in6) || - !tuple->ip_proto) { - /* icmp_type, icmp_code, and icmp_id can be 0. */ - if (tuple->ip_proto != IPPROTO_ICMP && - tuple->ip_proto != IPPROTO_ICMPV6) { - if (!tuple->src_port || !tuple->dst_port) { - ds_put_cstr(ds, "at least one of the conntrack 5-tuple fields " - "is missing."); - goto error; - } - } + if (!tuple->ip_proto && (tuple->src_port || tuple->dst_port)) { + ds_put_cstr(ds, "port is set without protocol"); + goto error; } free(copy); diff --git a/lib/dpctl.man b/lib/dpctl.man index 87ea8087b..b0cabe05d 100644 --- a/lib/dpctl.man +++ b/lib/dpctl.man @@ -312,7 +312,8 @@ If \fBzone\fR=\fIzone\fR is specified, only flushes the connections in If \fIct-tuple\fR is provided, flushes the connection entry specified by \fIct-tuple\fR in \fIzone\fR. The zone defaults to 0 if it is not provided. The userspace connection tracker requires flushing with the original pre-NATed -tuple and a warning log will be otherwise generated. +tuple and a warning log will be otherwise generated. The tuple can be partial +and will remove all connections that are matching on the specified fields. An example of an IPv4 ICMP \fIct-tuple\fR: .IP "ct_nw_src=10.1.1.1,ct_nw_dst=10.1.1.2,ct_nw_proto=1,icmp_type=8,icmp_code=0,icmp_id=10" diff --git a/tests/system-traffic.at b/tests/system-traffic.at index 731de439c..81b32f348 100644 --- a/tests/system-traffic.at +++ b/tests/system-traffic.at @@ -2221,7 +2221,7 @@ AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "orig=.src=10\.1\.1\.1,"], [], udp,orig=(src=10.1.1.1,dst=10.1.1.2,sport=1,dport=2),reply=(src=10.1.1.2,dst=10.1.1.1,sport=2,dport=1) ]) -AT_CHECK([ovs-appctl dpctl/flush-conntrack 'ct_nw_src=10.1.1.2,ct_nw_dst=10.1.1.1,ct_nw_proto=17,ct_tp_src=2,ct_tp_dst=1']) +AT_CHECK([ovs-appctl dpctl/flush-conntrack 'ct_nw_src=10.1.1.1,ct_nw_dst=10.1.1.2,ct_nw_proto=17,ct_tp_src=1,ct_tp_dst=2']) AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "orig=.src=10\.1\.1\.1,"], [1], [dnl ]) @@ -2233,7 +2233,7 @@ AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "orig=.src=10\.1\.1\.2,"], [0], udp,orig=(src=10.1.1.2,dst=10.1.1.1,sport=2,dport=1),reply=(src=10.1.1.1,dst=10.1.1.2,sport=1,dport=2),zone=5 ]) -AT_CHECK([ovs-appctl dpctl/flush-conntrack zone=5 'ct_nw_src=10.1.1.1,ct_nw_dst=10.1.1.2,ct_nw_proto=17,ct_tp_src=1,ct_tp_dst=2']) +AT_CHECK([ovs-appctl dpctl/flush-conntrack zone=5 'ct_nw_src=10.1.1.2,ct_nw_dst=10.1.1.1,ct_nw_proto=17,ct_tp_src=2,ct_tp_dst=1']) AT_CHECK([ovs-appctl dpctl/dump-conntrack | FORMAT_CT(10.1.1.2)], [0], [dnl ]) @@ -2255,6 +2255,86 @@ AT_CHECK([ovs-appctl dpctl/flush-conntrack zone=5 $ICMP_TUPLE]) AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "orig=.src=10\.1\.1\.2,"], [1], [dnl ]) +dnl Test UDP from port 1 and 2, partial flush by src port +AT_CHECK([ovs-ofctl -O OpenFlow13 packet-out br0 "in_port=1 packet=50540000000a50540000000908004500001c000000000011a4cd0a0101010a0101020001000200080000 actions=resubmit(,0)"]) +AT_CHECK([ovs-ofctl -O OpenFlow13 packet-out br0 "in_port=2 packet=50540000000a50540000000908004500001c000000000011a4cd0a0101020a0101010002000100080000 actions=resubmit(,0)"]) + + +AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "10\.1\.1\.1"], [0], [dnl +udp,orig=(src=10.1.1.1,dst=10.1.1.2,sport=1,dport=2),reply=(src=10.1.1.2,dst=10.1.1.1,sport=2,dport=1) +udp,orig=(src=10.1.1.2,dst=10.1.1.1,sport=2,dport=1),reply=(src=10.1.1.1,dst=10.1.1.2,sport=1,dport=2),zone=5 +]) + +AT_CHECK([ovs-appctl dpctl/flush-conntrack 'ct_nw_proto=17,ct_tp_src=1']) + +AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "10\.1\.1\.1"], [0], [dnl +udp,orig=(src=10.1.1.2,dst=10.1.1.1,sport=2,dport=1),reply=(src=10.1.1.1,dst=10.1.1.2,sport=1,dport=2),zone=5 +]) + +AT_CHECK([ovs-appctl dpctl/flush-conntrack 'ct_nw_proto=17,ct_tp_src=2']) + +AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "10\.1\.1\.1"], [1]) + +dnl Test UDP from port 1 and 2, partial flush by dst port +AT_CHECK([ovs-ofctl -O OpenFlow13 packet-out br0 "in_port=1 packet=50540000000a50540000000908004500001c000000000011a4cd0a0101010a0101020001000200080000 actions=resubmit(,0)"]) +AT_CHECK([ovs-ofctl -O OpenFlow13 packet-out br0 "in_port=2 packet=50540000000a50540000000908004500001c000000000011a4cd0a0101020a0101010002000100080000 actions=resubmit(,0)"]) + + +AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "10\.1\.1\.1"], [0], [dnl +udp,orig=(src=10.1.1.1,dst=10.1.1.2,sport=1,dport=2),reply=(src=10.1.1.2,dst=10.1.1.1,sport=2,dport=1) +udp,orig=(src=10.1.1.2,dst=10.1.1.1,sport=2,dport=1),reply=(src=10.1.1.1,dst=10.1.1.2,sport=1,dport=2),zone=5 +]) + +AT_CHECK([ovs-appctl dpctl/flush-conntrack 'ct_nw_proto=17,ct_tp_dst=2']) + +AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "10\.1\.1\.1"], [0], [dnl +udp,orig=(src=10.1.1.2,dst=10.1.1.1,sport=2,dport=1),reply=(src=10.1.1.1,dst=10.1.1.2,sport=1,dport=2),zone=5 +]) + +AT_CHECK([ovs-appctl dpctl/flush-conntrack 'ct_nw_proto=17,ct_tp_dst=1']) + +AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "10\.1\.1\.1"], [1]) + +dnl Test UDP from port 1 and 2, partial flush by src address +AT_CHECK([ovs-ofctl -O OpenFlow13 packet-out br0 "in_port=1 packet=50540000000a50540000000908004500001c000000000011a4cd0a0101010a0101020001000200080000 actions=resubmit(,0)"]) +AT_CHECK([ovs-ofctl -O OpenFlow13 packet-out br0 "in_port=2 packet=50540000000a50540000000908004500001c000000000011a4cd0a0101020a0101010002000100080000 actions=resubmit(,0)"]) + + +AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "10\.1\.1\.1"], [0], [dnl +udp,orig=(src=10.1.1.1,dst=10.1.1.2,sport=1,dport=2),reply=(src=10.1.1.2,dst=10.1.1.1,sport=2,dport=1) +udp,orig=(src=10.1.1.2,dst=10.1.1.1,sport=2,dport=1),reply=(src=10.1.1.1,dst=10.1.1.2,sport=1,dport=2),zone=5 +]) + +AT_CHECK([ovs-appctl dpctl/flush-conntrack 'ct_nw_src=10.1.1.1']) + +AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "10\.1\.1\.1"], [0], [dnl +udp,orig=(src=10.1.1.2,dst=10.1.1.1,sport=2,dport=1),reply=(src=10.1.1.1,dst=10.1.1.2,sport=1,dport=2),zone=5 +]) + +AT_CHECK([ovs-appctl dpctl/flush-conntrack 'ct_nw_src=10.1.1.2']) + +AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "10\.1\.1\.1"], [1]) + +dnl Test UDP from port 1 and 2, partial flush by dst address +AT_CHECK([ovs-ofctl -O OpenFlow13 packet-out br0 "in_port=1 packet=50540000000a50540000000908004500001c000000000011a4cd0a0101010a0101020001000200080000 actions=resubmit(,0)"]) +AT_CHECK([ovs-ofctl -O OpenFlow13 packet-out br0 "in_port=2 packet=50540000000a50540000000908004500001c000000000011a4cd0a0101020a0101010002000100080000 actions=resubmit(,0)"]) + + +AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "10\.1\.1\.1"], [0], [dnl +udp,orig=(src=10.1.1.1,dst=10.1.1.2,sport=1,dport=2),reply=(src=10.1.1.2,dst=10.1.1.1,sport=2,dport=1) +udp,orig=(src=10.1.1.2,dst=10.1.1.1,sport=2,dport=1),reply=(src=10.1.1.1,dst=10.1.1.2,sport=1,dport=2),zone=5 +]) + +AT_CHECK([ovs-appctl dpctl/flush-conntrack 'ct_nw_dst=10.1.1.2']) + +AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "10\.1\.1\.1"], [0], [dnl +udp,orig=(src=10.1.1.2,dst=10.1.1.1,sport=2,dport=1),reply=(src=10.1.1.1,dst=10.1.1.2,sport=1,dport=2),zone=5 +]) + +AT_CHECK([ovs-appctl dpctl/flush-conntrack 'ct_nw_dst=10.1.1.1']) + +AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep "10\.1\.1\.1"], [1]) + OVS_TRAFFIC_VSWITCHD_STOP AT_CLEANUP -- 2.37.2 _______________________________________________ dev mailing list d...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-dev
