17f8a436eSJoe Stringer /* 27f8a436eSJoe Stringer * Copyright (c) 2015 Nicira, Inc. 37f8a436eSJoe Stringer * 47f8a436eSJoe Stringer * This program is free software; you can redistribute it and/or 57f8a436eSJoe Stringer * modify it under the terms of version 2 of the GNU General Public 67f8a436eSJoe Stringer * License as published by the Free Software Foundation. 77f8a436eSJoe Stringer * 87f8a436eSJoe Stringer * This program is distributed in the hope that it will be useful, but 97f8a436eSJoe Stringer * WITHOUT ANY WARRANTY; without even the implied warranty of 107f8a436eSJoe Stringer * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 117f8a436eSJoe Stringer * General Public License for more details. 127f8a436eSJoe Stringer */ 137f8a436eSJoe Stringer 147f8a436eSJoe Stringer #include <linux/module.h> 157f8a436eSJoe Stringer #include <linux/openvswitch.h> 1605752523SJarno Rajahalme #include <linux/tcp.h> 1705752523SJarno Rajahalme #include <linux/udp.h> 1805752523SJarno Rajahalme #include <linux/sctp.h> 197f8a436eSJoe Stringer #include <net/ip.h> 207f8a436eSJoe Stringer #include <net/netfilter/nf_conntrack_core.h> 21cae3a262SJoe Stringer #include <net/netfilter/nf_conntrack_helper.h> 22c2ac6673SJoe Stringer #include <net/netfilter/nf_conntrack_labels.h> 2305752523SJarno Rajahalme #include <net/netfilter/nf_conntrack_seqadj.h> 247f8a436eSJoe Stringer #include <net/netfilter/nf_conntrack_zones.h> 257f8a436eSJoe Stringer #include <net/netfilter/ipv6/nf_defrag_ipv6.h> 267f8a436eSJoe Stringer 2705752523SJarno Rajahalme #ifdef CONFIG_NF_NAT_NEEDED 2805752523SJarno Rajahalme #include <linux/netfilter/nf_nat.h> 2905752523SJarno Rajahalme #include <net/netfilter/nf_nat_core.h> 3005752523SJarno Rajahalme #include <net/netfilter/nf_nat_l3proto.h> 3105752523SJarno Rajahalme #endif 3205752523SJarno Rajahalme 337f8a436eSJoe Stringer #include "datapath.h" 347f8a436eSJoe Stringer #include "conntrack.h" 357f8a436eSJoe Stringer #include "flow.h" 367f8a436eSJoe Stringer #include "flow_netlink.h" 377f8a436eSJoe Stringer 387f8a436eSJoe Stringer struct ovs_ct_len_tbl { 3905752523SJarno Rajahalme int maxlen; 4005752523SJarno Rajahalme int minlen; 417f8a436eSJoe Stringer }; 427f8a436eSJoe Stringer 43182e3042SJoe Stringer /* Metadata mark for masked write to conntrack mark */ 44182e3042SJoe Stringer struct md_mark { 45182e3042SJoe Stringer u32 value; 46182e3042SJoe Stringer u32 mask; 47182e3042SJoe Stringer }; 48182e3042SJoe Stringer 49c2ac6673SJoe Stringer /* Metadata label for masked write to conntrack label. */ 5033db4125SJoe Stringer struct md_labels { 5133db4125SJoe Stringer struct ovs_key_ct_labels value; 5233db4125SJoe Stringer struct ovs_key_ct_labels mask; 53c2ac6673SJoe Stringer }; 54c2ac6673SJoe Stringer 5505752523SJarno Rajahalme enum ovs_ct_nat { 5605752523SJarno Rajahalme OVS_CT_NAT = 1 << 0, /* NAT for committed connections only. */ 5705752523SJarno Rajahalme OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */ 5805752523SJarno Rajahalme OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */ 5905752523SJarno Rajahalme }; 6005752523SJarno Rajahalme 617f8a436eSJoe Stringer /* Conntrack action context for execution. */ 627f8a436eSJoe Stringer struct ovs_conntrack_info { 63cae3a262SJoe Stringer struct nf_conntrack_helper *helper; 647f8a436eSJoe Stringer struct nf_conntrack_zone zone; 657f8a436eSJoe Stringer struct nf_conn *ct; 66ab38a7b5SJoe Stringer u8 commit : 1; 6705752523SJarno Rajahalme u8 nat : 3; /* enum ovs_ct_nat */ 68dd41d33fSJarno Rajahalme u8 force : 1; 697f8a436eSJoe Stringer u16 family; 70182e3042SJoe Stringer struct md_mark mark; 7133db4125SJoe Stringer struct md_labels labels; 7205752523SJarno Rajahalme #ifdef CONFIG_NF_NAT_NEEDED 7305752523SJarno Rajahalme struct nf_nat_range range; /* Only present for SRC NAT and DST NAT. */ 7405752523SJarno Rajahalme #endif 757f8a436eSJoe Stringer }; 767f8a436eSJoe Stringer 7709aa98adSJarno Rajahalme static bool labels_nonzero(const struct ovs_key_ct_labels *labels); 7809aa98adSJarno Rajahalme 792f3ab9f9SJoe Stringer static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info); 802f3ab9f9SJoe Stringer 817f8a436eSJoe Stringer static u16 key_to_nfproto(const struct sw_flow_key *key) 827f8a436eSJoe Stringer { 837f8a436eSJoe Stringer switch (ntohs(key->eth.type)) { 847f8a436eSJoe Stringer case ETH_P_IP: 857f8a436eSJoe Stringer return NFPROTO_IPV4; 867f8a436eSJoe Stringer case ETH_P_IPV6: 877f8a436eSJoe Stringer return NFPROTO_IPV6; 887f8a436eSJoe Stringer default: 897f8a436eSJoe Stringer return NFPROTO_UNSPEC; 907f8a436eSJoe Stringer } 917f8a436eSJoe Stringer } 927f8a436eSJoe Stringer 937f8a436eSJoe Stringer /* Map SKB connection state into the values used by flow definition. */ 947f8a436eSJoe Stringer static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo) 957f8a436eSJoe Stringer { 967f8a436eSJoe Stringer u8 ct_state = OVS_CS_F_TRACKED; 977f8a436eSJoe Stringer 987f8a436eSJoe Stringer switch (ctinfo) { 997f8a436eSJoe Stringer case IP_CT_ESTABLISHED_REPLY: 1007f8a436eSJoe Stringer case IP_CT_RELATED_REPLY: 1017f8a436eSJoe Stringer ct_state |= OVS_CS_F_REPLY_DIR; 1027f8a436eSJoe Stringer break; 1037f8a436eSJoe Stringer default: 1047f8a436eSJoe Stringer break; 1057f8a436eSJoe Stringer } 1067f8a436eSJoe Stringer 1077f8a436eSJoe Stringer switch (ctinfo) { 1087f8a436eSJoe Stringer case IP_CT_ESTABLISHED: 1097f8a436eSJoe Stringer case IP_CT_ESTABLISHED_REPLY: 1107f8a436eSJoe Stringer ct_state |= OVS_CS_F_ESTABLISHED; 1117f8a436eSJoe Stringer break; 1127f8a436eSJoe Stringer case IP_CT_RELATED: 1137f8a436eSJoe Stringer case IP_CT_RELATED_REPLY: 1147f8a436eSJoe Stringer ct_state |= OVS_CS_F_RELATED; 1157f8a436eSJoe Stringer break; 1167f8a436eSJoe Stringer case IP_CT_NEW: 1177f8a436eSJoe Stringer ct_state |= OVS_CS_F_NEW; 1187f8a436eSJoe Stringer break; 1197f8a436eSJoe Stringer default: 1207f8a436eSJoe Stringer break; 1217f8a436eSJoe Stringer } 1227f8a436eSJoe Stringer 1237f8a436eSJoe Stringer return ct_state; 1247f8a436eSJoe Stringer } 1257f8a436eSJoe Stringer 1260d5cdef8SJoe Stringer static u32 ovs_ct_get_mark(const struct nf_conn *ct) 1270d5cdef8SJoe Stringer { 1280d5cdef8SJoe Stringer #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) 1290d5cdef8SJoe Stringer return ct ? ct->mark : 0; 1300d5cdef8SJoe Stringer #else 1310d5cdef8SJoe Stringer return 0; 1320d5cdef8SJoe Stringer #endif 1330d5cdef8SJoe Stringer } 1340d5cdef8SJoe Stringer 135b87cec38SJarno Rajahalme /* Guard against conntrack labels max size shrinking below 128 bits. */ 136b87cec38SJarno Rajahalme #if NF_CT_LABELS_MAX_SIZE < 16 137b87cec38SJarno Rajahalme #error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes 138b87cec38SJarno Rajahalme #endif 139b87cec38SJarno Rajahalme 14033db4125SJoe Stringer static void ovs_ct_get_labels(const struct nf_conn *ct, 14133db4125SJoe Stringer struct ovs_key_ct_labels *labels) 142c2ac6673SJoe Stringer { 143c2ac6673SJoe Stringer struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL; 144c2ac6673SJoe Stringer 145b87cec38SJarno Rajahalme if (cl) 146b87cec38SJarno Rajahalme memcpy(labels, cl->bits, OVS_CT_LABELS_LEN); 147b87cec38SJarno Rajahalme else 14833db4125SJoe Stringer memset(labels, 0, OVS_CT_LABELS_LEN); 149c2ac6673SJoe Stringer } 150c2ac6673SJoe Stringer 1519dd7f890SJarno Rajahalme static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key, 1529dd7f890SJarno Rajahalme const struct nf_conntrack_tuple *orig, 1539dd7f890SJarno Rajahalme u8 icmp_proto) 1549dd7f890SJarno Rajahalme { 155316d4d78SJarno Rajahalme key->ct_orig_proto = orig->dst.protonum; 1569dd7f890SJarno Rajahalme if (orig->dst.protonum == icmp_proto) { 1579dd7f890SJarno Rajahalme key->ct.orig_tp.src = htons(orig->dst.u.icmp.type); 1589dd7f890SJarno Rajahalme key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code); 1599dd7f890SJarno Rajahalme } else { 1609dd7f890SJarno Rajahalme key->ct.orig_tp.src = orig->src.u.all; 1619dd7f890SJarno Rajahalme key->ct.orig_tp.dst = orig->dst.u.all; 1629dd7f890SJarno Rajahalme } 1639dd7f890SJarno Rajahalme } 1649dd7f890SJarno Rajahalme 1657f8a436eSJoe Stringer static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state, 166182e3042SJoe Stringer const struct nf_conntrack_zone *zone, 167182e3042SJoe Stringer const struct nf_conn *ct) 1687f8a436eSJoe Stringer { 169316d4d78SJarno Rajahalme key->ct_state = state; 170316d4d78SJarno Rajahalme key->ct_zone = zone->id; 1710d5cdef8SJoe Stringer key->ct.mark = ovs_ct_get_mark(ct); 17233db4125SJoe Stringer ovs_ct_get_labels(ct, &key->ct.labels); 1739dd7f890SJarno Rajahalme 1749dd7f890SJarno Rajahalme if (ct) { 1759dd7f890SJarno Rajahalme const struct nf_conntrack_tuple *orig; 1769dd7f890SJarno Rajahalme 1779dd7f890SJarno Rajahalme /* Use the master if we have one. */ 1789dd7f890SJarno Rajahalme if (ct->master) 1799dd7f890SJarno Rajahalme ct = ct->master; 1809dd7f890SJarno Rajahalme orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; 1819dd7f890SJarno Rajahalme 1829dd7f890SJarno Rajahalme /* IP version must match with the master connection. */ 1839dd7f890SJarno Rajahalme if (key->eth.type == htons(ETH_P_IP) && 1849dd7f890SJarno Rajahalme nf_ct_l3num(ct) == NFPROTO_IPV4) { 1859dd7f890SJarno Rajahalme key->ipv4.ct_orig.src = orig->src.u3.ip; 1869dd7f890SJarno Rajahalme key->ipv4.ct_orig.dst = orig->dst.u3.ip; 1879dd7f890SJarno Rajahalme __ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP); 1889dd7f890SJarno Rajahalme return; 1899dd7f890SJarno Rajahalme } else if (key->eth.type == htons(ETH_P_IPV6) && 1909dd7f890SJarno Rajahalme !sw_flow_key_is_nd(key) && 1919dd7f890SJarno Rajahalme nf_ct_l3num(ct) == NFPROTO_IPV6) { 1929dd7f890SJarno Rajahalme key->ipv6.ct_orig.src = orig->src.u3.in6; 1939dd7f890SJarno Rajahalme key->ipv6.ct_orig.dst = orig->dst.u3.in6; 1949dd7f890SJarno Rajahalme __ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP); 1959dd7f890SJarno Rajahalme return; 1969dd7f890SJarno Rajahalme } 1979dd7f890SJarno Rajahalme } 198316d4d78SJarno Rajahalme /* Clear 'ct_orig_proto' to mark the non-existence of conntrack 1999dd7f890SJarno Rajahalme * original direction key fields. 2009dd7f890SJarno Rajahalme */ 201316d4d78SJarno Rajahalme key->ct_orig_proto = 0; 2027f8a436eSJoe Stringer } 2037f8a436eSJoe Stringer 2045e17da63SJarno Rajahalme /* Update 'key' based on skb->_nfct. If 'post_ct' is true, then OVS has 20505752523SJarno Rajahalme * previously sent the packet to conntrack via the ct action. If 20605752523SJarno Rajahalme * 'keep_nat_flags' is true, the existing NAT flags retained, else they are 20705752523SJarno Rajahalme * initialized from the connection status. 2087f8a436eSJoe Stringer */ 2097f8a436eSJoe Stringer static void ovs_ct_update_key(const struct sk_buff *skb, 210d110986cSJoe Stringer const struct ovs_conntrack_info *info, 21105752523SJarno Rajahalme struct sw_flow_key *key, bool post_ct, 21205752523SJarno Rajahalme bool keep_nat_flags) 2137f8a436eSJoe Stringer { 2147f8a436eSJoe Stringer const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt; 2157f8a436eSJoe Stringer enum ip_conntrack_info ctinfo; 2167f8a436eSJoe Stringer struct nf_conn *ct; 2177f8a436eSJoe Stringer u8 state = 0; 2187f8a436eSJoe Stringer 2197f8a436eSJoe Stringer ct = nf_ct_get(skb, &ctinfo); 2207f8a436eSJoe Stringer if (ct) { 2217f8a436eSJoe Stringer state = ovs_ct_get_state(ctinfo); 2229f13ded8SJarno Rajahalme /* All unconfirmed entries are NEW connections. */ 2234f0909eeSJoe Stringer if (!nf_ct_is_confirmed(ct)) 2244f0909eeSJoe Stringer state |= OVS_CS_F_NEW; 2259f13ded8SJarno Rajahalme /* OVS persists the related flag for the duration of the 2269f13ded8SJarno Rajahalme * connection. 2279f13ded8SJarno Rajahalme */ 2287f8a436eSJoe Stringer if (ct->master) 2297f8a436eSJoe Stringer state |= OVS_CS_F_RELATED; 23005752523SJarno Rajahalme if (keep_nat_flags) { 231316d4d78SJarno Rajahalme state |= key->ct_state & OVS_CS_F_NAT_MASK; 23205752523SJarno Rajahalme } else { 23305752523SJarno Rajahalme if (ct->status & IPS_SRC_NAT) 23405752523SJarno Rajahalme state |= OVS_CS_F_SRC_NAT; 23505752523SJarno Rajahalme if (ct->status & IPS_DST_NAT) 23605752523SJarno Rajahalme state |= OVS_CS_F_DST_NAT; 23705752523SJarno Rajahalme } 2387f8a436eSJoe Stringer zone = nf_ct_zone(ct); 2397f8a436eSJoe Stringer } else if (post_ct) { 2407f8a436eSJoe Stringer state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID; 241d110986cSJoe Stringer if (info) 242d110986cSJoe Stringer zone = &info->zone; 2437f8a436eSJoe Stringer } 244182e3042SJoe Stringer __ovs_ct_update_key(key, state, zone, ct); 2457f8a436eSJoe Stringer } 2467f8a436eSJoe Stringer 2479f13ded8SJarno Rajahalme /* This is called to initialize CT key fields possibly coming in from the local 2489f13ded8SJarno Rajahalme * stack. 2499f13ded8SJarno Rajahalme */ 2507f8a436eSJoe Stringer void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key) 2517f8a436eSJoe Stringer { 25205752523SJarno Rajahalme ovs_ct_update_key(skb, NULL, key, false, false); 2537f8a436eSJoe Stringer } 2547f8a436eSJoe Stringer 2559dd7f890SJarno Rajahalme #define IN6_ADDR_INITIALIZER(ADDR) \ 2569dd7f890SJarno Rajahalme { (ADDR).s6_addr32[0], (ADDR).s6_addr32[1], \ 2579dd7f890SJarno Rajahalme (ADDR).s6_addr32[2], (ADDR).s6_addr32[3] } 2589dd7f890SJarno Rajahalme 2599dd7f890SJarno Rajahalme int ovs_ct_put_key(const struct sw_flow_key *swkey, 2609dd7f890SJarno Rajahalme const struct sw_flow_key *output, struct sk_buff *skb) 2617f8a436eSJoe Stringer { 262316d4d78SJarno Rajahalme if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state)) 2637f8a436eSJoe Stringer return -EMSGSIZE; 2647f8a436eSJoe Stringer 2657f8a436eSJoe Stringer if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && 266316d4d78SJarno Rajahalme nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone)) 2677f8a436eSJoe Stringer return -EMSGSIZE; 2687f8a436eSJoe Stringer 269182e3042SJoe Stringer if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && 2709dd7f890SJarno Rajahalme nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark)) 271182e3042SJoe Stringer return -EMSGSIZE; 272182e3042SJoe Stringer 2739723e6abSValentin Rothberg if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 2749dd7f890SJarno Rajahalme nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels), 2759dd7f890SJarno Rajahalme &output->ct.labels)) 276c2ac6673SJoe Stringer return -EMSGSIZE; 277c2ac6673SJoe Stringer 278316d4d78SJarno Rajahalme if (swkey->ct_orig_proto) { 2799dd7f890SJarno Rajahalme if (swkey->eth.type == htons(ETH_P_IP)) { 2809dd7f890SJarno Rajahalme struct ovs_key_ct_tuple_ipv4 orig = { 2819dd7f890SJarno Rajahalme output->ipv4.ct_orig.src, 2829dd7f890SJarno Rajahalme output->ipv4.ct_orig.dst, 2839dd7f890SJarno Rajahalme output->ct.orig_tp.src, 2849dd7f890SJarno Rajahalme output->ct.orig_tp.dst, 285316d4d78SJarno Rajahalme output->ct_orig_proto, 2869dd7f890SJarno Rajahalme }; 2879dd7f890SJarno Rajahalme if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4, 2889dd7f890SJarno Rajahalme sizeof(orig), &orig)) 2899dd7f890SJarno Rajahalme return -EMSGSIZE; 2909dd7f890SJarno Rajahalme } else if (swkey->eth.type == htons(ETH_P_IPV6)) { 2919dd7f890SJarno Rajahalme struct ovs_key_ct_tuple_ipv6 orig = { 2929dd7f890SJarno Rajahalme IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.src), 2939dd7f890SJarno Rajahalme IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.dst), 2949dd7f890SJarno Rajahalme output->ct.orig_tp.src, 2959dd7f890SJarno Rajahalme output->ct.orig_tp.dst, 296316d4d78SJarno Rajahalme output->ct_orig_proto, 2979dd7f890SJarno Rajahalme }; 2989dd7f890SJarno Rajahalme if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6, 2999dd7f890SJarno Rajahalme sizeof(orig), &orig)) 3009dd7f890SJarno Rajahalme return -EMSGSIZE; 3019dd7f890SJarno Rajahalme } 3029dd7f890SJarno Rajahalme } 3039dd7f890SJarno Rajahalme 304182e3042SJoe Stringer return 0; 305182e3042SJoe Stringer } 306182e3042SJoe Stringer 3076ffcea79SJarno Rajahalme static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key, 308182e3042SJoe Stringer u32 ct_mark, u32 mask) 309182e3042SJoe Stringer { 3100d5cdef8SJoe Stringer #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) 311182e3042SJoe Stringer u32 new_mark; 312182e3042SJoe Stringer 313182e3042SJoe Stringer new_mark = ct_mark | (ct->mark & ~(mask)); 314182e3042SJoe Stringer if (ct->mark != new_mark) { 315182e3042SJoe Stringer ct->mark = new_mark; 316193e3096SJarno Rajahalme if (nf_ct_is_confirmed(ct)) 317182e3042SJoe Stringer nf_conntrack_event_cache(IPCT_MARK, ct); 318182e3042SJoe Stringer key->ct.mark = new_mark; 319182e3042SJoe Stringer } 320182e3042SJoe Stringer 3217f8a436eSJoe Stringer return 0; 3220d5cdef8SJoe Stringer #else 3230d5cdef8SJoe Stringer return -ENOTSUPP; 3240d5cdef8SJoe Stringer #endif 3257f8a436eSJoe Stringer } 3267f8a436eSJoe Stringer 3276ffcea79SJarno Rajahalme static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct) 328c2ac6673SJoe Stringer { 329c2ac6673SJoe Stringer struct nf_conn_labels *cl; 330c2ac6673SJoe Stringer 331c2ac6673SJoe Stringer cl = nf_ct_labels_find(ct); 332c2ac6673SJoe Stringer if (!cl) { 333c2ac6673SJoe Stringer nf_ct_labels_ext_add(ct); 334c2ac6673SJoe Stringer cl = nf_ct_labels_find(ct); 335c2ac6673SJoe Stringer } 3366ffcea79SJarno Rajahalme 3376ffcea79SJarno Rajahalme return cl; 3386ffcea79SJarno Rajahalme } 3396ffcea79SJarno Rajahalme 3406ffcea79SJarno Rajahalme /* Initialize labels for a new, yet to be committed conntrack entry. Note that 3416ffcea79SJarno Rajahalme * since the new connection is not yet confirmed, and thus no-one else has 3426ffcea79SJarno Rajahalme * access to it's labels, we simply write them over. Also, we refrain from 3436ffcea79SJarno Rajahalme * triggering events, as receiving change events before the create event would 3446ffcea79SJarno Rajahalme * be confusing. 3456ffcea79SJarno Rajahalme */ 3466ffcea79SJarno Rajahalme static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key, 3476ffcea79SJarno Rajahalme const struct ovs_key_ct_labels *labels, 3486ffcea79SJarno Rajahalme const struct ovs_key_ct_labels *mask) 3496ffcea79SJarno Rajahalme { 35009aa98adSJarno Rajahalme struct nf_conn_labels *cl, *master_cl; 35109aa98adSJarno Rajahalme bool have_mask = labels_nonzero(mask); 35209aa98adSJarno Rajahalme 35309aa98adSJarno Rajahalme /* Inherit master's labels to the related connection? */ 35409aa98adSJarno Rajahalme master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL; 35509aa98adSJarno Rajahalme 35609aa98adSJarno Rajahalme if (!master_cl && !have_mask) 35709aa98adSJarno Rajahalme return 0; /* Nothing to do. */ 3586ffcea79SJarno Rajahalme 3596ffcea79SJarno Rajahalme cl = ovs_ct_get_conn_labels(ct); 360b87cec38SJarno Rajahalme if (!cl) 361c2ac6673SJoe Stringer return -ENOSPC; 362c2ac6673SJoe Stringer 36309aa98adSJarno Rajahalme /* Inherit the master's labels, if any. */ 36409aa98adSJarno Rajahalme if (master_cl) 36509aa98adSJarno Rajahalme *cl = *master_cl; 36609aa98adSJarno Rajahalme 36709aa98adSJarno Rajahalme if (have_mask) { 36809aa98adSJarno Rajahalme u32 *dst = (u32 *)cl->bits; 36909aa98adSJarno Rajahalme int i; 37009aa98adSJarno Rajahalme 3716ffcea79SJarno Rajahalme for (i = 0; i < OVS_CT_LABELS_LEN_32; i++) 3726ffcea79SJarno Rajahalme dst[i] = (dst[i] & ~mask->ct_labels_32[i]) | 37309aa98adSJarno Rajahalme (labels->ct_labels_32[i] 37409aa98adSJarno Rajahalme & mask->ct_labels_32[i]); 37509aa98adSJarno Rajahalme } 3766ffcea79SJarno Rajahalme 3776ffcea79SJarno Rajahalme memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); 3786ffcea79SJarno Rajahalme 3796ffcea79SJarno Rajahalme return 0; 3806ffcea79SJarno Rajahalme } 3816ffcea79SJarno Rajahalme 3826ffcea79SJarno Rajahalme static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key, 3836ffcea79SJarno Rajahalme const struct ovs_key_ct_labels *labels, 3846ffcea79SJarno Rajahalme const struct ovs_key_ct_labels *mask) 3856ffcea79SJarno Rajahalme { 3866ffcea79SJarno Rajahalme struct nf_conn_labels *cl; 3876ffcea79SJarno Rajahalme int err; 3886ffcea79SJarno Rajahalme 3896ffcea79SJarno Rajahalme cl = ovs_ct_get_conn_labels(ct); 3906ffcea79SJarno Rajahalme if (!cl) 3916ffcea79SJarno Rajahalme return -ENOSPC; 3926ffcea79SJarno Rajahalme 3936ffcea79SJarno Rajahalme err = nf_connlabels_replace(ct, labels->ct_labels_32, 394cb80d58fSJarno Rajahalme mask->ct_labels_32, 395cb80d58fSJarno Rajahalme OVS_CT_LABELS_LEN_32); 396c2ac6673SJoe Stringer if (err) 397c2ac6673SJoe Stringer return err; 398193e3096SJarno Rajahalme 3996ffcea79SJarno Rajahalme memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); 400c2ac6673SJoe Stringer 401c2ac6673SJoe Stringer return 0; 402c2ac6673SJoe Stringer } 403c2ac6673SJoe Stringer 404cae3a262SJoe Stringer /* 'skb' should already be pulled to nh_ofs. */ 405cae3a262SJoe Stringer static int ovs_ct_helper(struct sk_buff *skb, u16 proto) 406cae3a262SJoe Stringer { 407cae3a262SJoe Stringer const struct nf_conntrack_helper *helper; 408cae3a262SJoe Stringer const struct nf_conn_help *help; 409cae3a262SJoe Stringer enum ip_conntrack_info ctinfo; 410cae3a262SJoe Stringer unsigned int protoff; 411cae3a262SJoe Stringer struct nf_conn *ct; 41205752523SJarno Rajahalme int err; 413cae3a262SJoe Stringer 414cae3a262SJoe Stringer ct = nf_ct_get(skb, &ctinfo); 415cae3a262SJoe Stringer if (!ct || ctinfo == IP_CT_RELATED_REPLY) 416cae3a262SJoe Stringer return NF_ACCEPT; 417cae3a262SJoe Stringer 418cae3a262SJoe Stringer help = nfct_help(ct); 419cae3a262SJoe Stringer if (!help) 420cae3a262SJoe Stringer return NF_ACCEPT; 421cae3a262SJoe Stringer 422cae3a262SJoe Stringer helper = rcu_dereference(help->helper); 423cae3a262SJoe Stringer if (!helper) 424cae3a262SJoe Stringer return NF_ACCEPT; 425cae3a262SJoe Stringer 426cae3a262SJoe Stringer switch (proto) { 427cae3a262SJoe Stringer case NFPROTO_IPV4: 428cae3a262SJoe Stringer protoff = ip_hdrlen(skb); 429cae3a262SJoe Stringer break; 430cae3a262SJoe Stringer case NFPROTO_IPV6: { 431cae3a262SJoe Stringer u8 nexthdr = ipv6_hdr(skb)->nexthdr; 432cae3a262SJoe Stringer __be16 frag_off; 433cc570605SJoe Stringer int ofs; 434cae3a262SJoe Stringer 435cc570605SJoe Stringer ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, 436cc570605SJoe Stringer &frag_off); 437cc570605SJoe Stringer if (ofs < 0 || (frag_off & htons(~0x7)) != 0) { 438cae3a262SJoe Stringer pr_debug("proto header not found\n"); 439cae3a262SJoe Stringer return NF_ACCEPT; 440cae3a262SJoe Stringer } 441cc570605SJoe Stringer protoff = ofs; 442cae3a262SJoe Stringer break; 443cae3a262SJoe Stringer } 444cae3a262SJoe Stringer default: 445cae3a262SJoe Stringer WARN_ONCE(1, "helper invoked on non-IP family!"); 446cae3a262SJoe Stringer return NF_DROP; 447cae3a262SJoe Stringer } 448cae3a262SJoe Stringer 44905752523SJarno Rajahalme err = helper->help(skb, protoff, ct, ctinfo); 45005752523SJarno Rajahalme if (err != NF_ACCEPT) 45105752523SJarno Rajahalme return err; 45205752523SJarno Rajahalme 45305752523SJarno Rajahalme /* Adjust seqs after helper. This is needed due to some helpers (e.g., 45405752523SJarno Rajahalme * FTP with NAT) adusting the TCP payload size when mangling IP 45505752523SJarno Rajahalme * addresses and/or port numbers in the text-based control connection. 45605752523SJarno Rajahalme */ 45705752523SJarno Rajahalme if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && 45805752523SJarno Rajahalme !nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) 45905752523SJarno Rajahalme return NF_DROP; 46005752523SJarno Rajahalme return NF_ACCEPT; 461cae3a262SJoe Stringer } 462cae3a262SJoe Stringer 46374c16618SJoe Stringer /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero 46474c16618SJoe Stringer * value if 'skb' is freed. 46574c16618SJoe Stringer */ 4667f8a436eSJoe Stringer static int handle_fragments(struct net *net, struct sw_flow_key *key, 4677f8a436eSJoe Stringer u16 zone, struct sk_buff *skb) 4687f8a436eSJoe Stringer { 4697f8a436eSJoe Stringer struct ovs_skb_cb ovs_cb = *OVS_CB(skb); 470daaa7d64SFlorian Westphal int err; 4717f8a436eSJoe Stringer 4727f8a436eSJoe Stringer if (key->eth.type == htons(ETH_P_IP)) { 4737f8a436eSJoe Stringer enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone; 4747f8a436eSJoe Stringer 4757f8a436eSJoe Stringer memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); 47619bcf9f2SEric W. Biederman err = ip_defrag(net, skb, user); 4777f8a436eSJoe Stringer if (err) 4787f8a436eSJoe Stringer return err; 4797f8a436eSJoe Stringer 4807f8a436eSJoe Stringer ovs_cb.mru = IPCB(skb)->frag_max_size; 4817f8a436eSJoe Stringer #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) 48274c16618SJoe Stringer } else if (key->eth.type == htons(ETH_P_IPV6)) { 4837f8a436eSJoe Stringer enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone; 4847f8a436eSJoe Stringer 48549e261a8SJoe Stringer skb_orphan(skb); 4867f8a436eSJoe Stringer memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); 487daaa7d64SFlorian Westphal err = nf_ct_frag6_gather(net, skb, user); 488f92a80a9SDaniele Di Proietto if (err) { 489f92a80a9SDaniele Di Proietto if (err != -EINPROGRESS) 490f92a80a9SDaniele Di Proietto kfree_skb(skb); 491daaa7d64SFlorian Westphal return err; 492f92a80a9SDaniele Di Proietto } 4937f8a436eSJoe Stringer 494daaa7d64SFlorian Westphal key->ip.proto = ipv6_hdr(skb)->nexthdr; 4957f8a436eSJoe Stringer ovs_cb.mru = IP6CB(skb)->frag_max_size; 4967f8a436eSJoe Stringer #endif 4977f8a436eSJoe Stringer } else { 49874c16618SJoe Stringer kfree_skb(skb); 4997f8a436eSJoe Stringer return -EPFNOSUPPORT; 5007f8a436eSJoe Stringer } 5017f8a436eSJoe Stringer 5027f8a436eSJoe Stringer key->ip.frag = OVS_FRAG_TYPE_NONE; 5037f8a436eSJoe Stringer skb_clear_hash(skb); 5047f8a436eSJoe Stringer skb->ignore_df = 1; 5057f8a436eSJoe Stringer *OVS_CB(skb) = ovs_cb; 5067f8a436eSJoe Stringer 5077f8a436eSJoe Stringer return 0; 5087f8a436eSJoe Stringer } 5097f8a436eSJoe Stringer 5107f8a436eSJoe Stringer static struct nf_conntrack_expect * 5117f8a436eSJoe Stringer ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone, 5127f8a436eSJoe Stringer u16 proto, const struct sk_buff *skb) 5137f8a436eSJoe Stringer { 5147f8a436eSJoe Stringer struct nf_conntrack_tuple tuple; 5157f8a436eSJoe Stringer 516a31f1adcSEric W. Biederman if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple)) 5177f8a436eSJoe Stringer return NULL; 5187f8a436eSJoe Stringer return __nf_ct_expect_find(net, zone, &tuple); 5197f8a436eSJoe Stringer } 5207f8a436eSJoe Stringer 521289f2253SJarno Rajahalme /* This replicates logic from nf_conntrack_core.c that is not exported. */ 522289f2253SJarno Rajahalme static enum ip_conntrack_info 523289f2253SJarno Rajahalme ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h) 524289f2253SJarno Rajahalme { 525289f2253SJarno Rajahalme const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); 526289f2253SJarno Rajahalme 527289f2253SJarno Rajahalme if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) 528289f2253SJarno Rajahalme return IP_CT_ESTABLISHED_REPLY; 529289f2253SJarno Rajahalme /* Once we've had two way comms, always ESTABLISHED. */ 530289f2253SJarno Rajahalme if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) 531289f2253SJarno Rajahalme return IP_CT_ESTABLISHED; 532289f2253SJarno Rajahalme if (test_bit(IPS_EXPECTED_BIT, &ct->status)) 533289f2253SJarno Rajahalme return IP_CT_RELATED; 534289f2253SJarno Rajahalme return IP_CT_NEW; 535289f2253SJarno Rajahalme } 536289f2253SJarno Rajahalme 537289f2253SJarno Rajahalme /* Find an existing connection which this packet belongs to without 538289f2253SJarno Rajahalme * re-attributing statistics or modifying the connection state. This allows an 5395e17da63SJarno Rajahalme * skb->_nfct lost due to an upcall to be recovered during actions execution. 540289f2253SJarno Rajahalme * 541289f2253SJarno Rajahalme * Must be called with rcu_read_lock. 542289f2253SJarno Rajahalme * 5435e17da63SJarno Rajahalme * On success, populates skb->_nfct and returns the connection. Returns NULL 5445e17da63SJarno Rajahalme * if there is no existing entry. 545289f2253SJarno Rajahalme */ 546289f2253SJarno Rajahalme static struct nf_conn * 547289f2253SJarno Rajahalme ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone, 5489ff464dbSJarno Rajahalme u8 l3num, struct sk_buff *skb, bool natted) 549289f2253SJarno Rajahalme { 550289f2253SJarno Rajahalme struct nf_conntrack_l3proto *l3proto; 551289f2253SJarno Rajahalme struct nf_conntrack_l4proto *l4proto; 552289f2253SJarno Rajahalme struct nf_conntrack_tuple tuple; 553289f2253SJarno Rajahalme struct nf_conntrack_tuple_hash *h; 554289f2253SJarno Rajahalme struct nf_conn *ct; 555289f2253SJarno Rajahalme unsigned int dataoff; 556289f2253SJarno Rajahalme u8 protonum; 557289f2253SJarno Rajahalme 558289f2253SJarno Rajahalme l3proto = __nf_ct_l3proto_find(l3num); 559289f2253SJarno Rajahalme if (l3proto->get_l4proto(skb, skb_network_offset(skb), &dataoff, 560289f2253SJarno Rajahalme &protonum) <= 0) { 561289f2253SJarno Rajahalme pr_debug("ovs_ct_find_existing: Can't get protonum\n"); 562289f2253SJarno Rajahalme return NULL; 563289f2253SJarno Rajahalme } 564289f2253SJarno Rajahalme l4proto = __nf_ct_l4proto_find(l3num, protonum); 565289f2253SJarno Rajahalme if (!nf_ct_get_tuple(skb, skb_network_offset(skb), dataoff, l3num, 566289f2253SJarno Rajahalme protonum, net, &tuple, l3proto, l4proto)) { 567289f2253SJarno Rajahalme pr_debug("ovs_ct_find_existing: Can't get tuple\n"); 568289f2253SJarno Rajahalme return NULL; 569289f2253SJarno Rajahalme } 570289f2253SJarno Rajahalme 5719ff464dbSJarno Rajahalme /* Must invert the tuple if skb has been transformed by NAT. */ 5729ff464dbSJarno Rajahalme if (natted) { 5739ff464dbSJarno Rajahalme struct nf_conntrack_tuple inverse; 5749ff464dbSJarno Rajahalme 5759ff464dbSJarno Rajahalme if (!nf_ct_invert_tuple(&inverse, &tuple, l3proto, l4proto)) { 5769ff464dbSJarno Rajahalme pr_debug("ovs_ct_find_existing: Inversion failed!\n"); 5779ff464dbSJarno Rajahalme return NULL; 5789ff464dbSJarno Rajahalme } 5799ff464dbSJarno Rajahalme tuple = inverse; 5809ff464dbSJarno Rajahalme } 5819ff464dbSJarno Rajahalme 582289f2253SJarno Rajahalme /* look for tuple match */ 583289f2253SJarno Rajahalme h = nf_conntrack_find_get(net, zone, &tuple); 584289f2253SJarno Rajahalme if (!h) 585289f2253SJarno Rajahalme return NULL; /* Not found. */ 586289f2253SJarno Rajahalme 587289f2253SJarno Rajahalme ct = nf_ct_tuplehash_to_ctrack(h); 588289f2253SJarno Rajahalme 5899ff464dbSJarno Rajahalme /* Inverted packet tuple matches the reverse direction conntrack tuple, 5909ff464dbSJarno Rajahalme * select the other tuplehash to get the right 'ctinfo' bits for this 5919ff464dbSJarno Rajahalme * packet. 5929ff464dbSJarno Rajahalme */ 5939ff464dbSJarno Rajahalme if (natted) 5949ff464dbSJarno Rajahalme h = &ct->tuplehash[!h->tuple.dst.dir]; 5959ff464dbSJarno Rajahalme 596c74454faSFlorian Westphal nf_ct_set(skb, ct, ovs_ct_get_info(h)); 597289f2253SJarno Rajahalme return ct; 598289f2253SJarno Rajahalme } 599289f2253SJarno Rajahalme 6005e17da63SJarno Rajahalme /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */ 601289f2253SJarno Rajahalme static bool skb_nfct_cached(struct net *net, 602289f2253SJarno Rajahalme const struct sw_flow_key *key, 603289f2253SJarno Rajahalme const struct ovs_conntrack_info *info, 604289f2253SJarno Rajahalme struct sk_buff *skb) 6057f8a436eSJoe Stringer { 6067f8a436eSJoe Stringer enum ip_conntrack_info ctinfo; 6077f8a436eSJoe Stringer struct nf_conn *ct; 6087f8a436eSJoe Stringer 6097f8a436eSJoe Stringer ct = nf_ct_get(skb, &ctinfo); 610289f2253SJarno Rajahalme /* If no ct, check if we have evidence that an existing conntrack entry 6115e17da63SJarno Rajahalme * might be found for this skb. This happens when we lose a skb->_nfct 612289f2253SJarno Rajahalme * due to an upcall. If the connection was not confirmed, it is not 613289f2253SJarno Rajahalme * cached and needs to be run through conntrack again. 614289f2253SJarno Rajahalme */ 615316d4d78SJarno Rajahalme if (!ct && key->ct_state & OVS_CS_F_TRACKED && 616316d4d78SJarno Rajahalme !(key->ct_state & OVS_CS_F_INVALID) && 617316d4d78SJarno Rajahalme key->ct_zone == info->zone.id) { 6189ff464dbSJarno Rajahalme ct = ovs_ct_find_existing(net, &info->zone, info->family, skb, 619316d4d78SJarno Rajahalme !!(key->ct_state 6209ff464dbSJarno Rajahalme & OVS_CS_F_NAT_MASK)); 621dd41d33fSJarno Rajahalme if (ct) 622dd41d33fSJarno Rajahalme nf_ct_get(skb, &ctinfo); 623dd41d33fSJarno Rajahalme } 6247f8a436eSJoe Stringer if (!ct) 6257f8a436eSJoe Stringer return false; 6267f8a436eSJoe Stringer if (!net_eq(net, read_pnet(&ct->ct_net))) 6277f8a436eSJoe Stringer return false; 6287f8a436eSJoe Stringer if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct))) 6297f8a436eSJoe Stringer return false; 630cae3a262SJoe Stringer if (info->helper) { 631cae3a262SJoe Stringer struct nf_conn_help *help; 632cae3a262SJoe Stringer 633cae3a262SJoe Stringer help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER); 634cae3a262SJoe Stringer if (help && rcu_access_pointer(help->helper) != info->helper) 635cae3a262SJoe Stringer return false; 636cae3a262SJoe Stringer } 637dd41d33fSJarno Rajahalme /* Force conntrack entry direction to the current packet? */ 638dd41d33fSJarno Rajahalme if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) { 639dd41d33fSJarno Rajahalme /* Delete the conntrack entry if confirmed, else just release 640dd41d33fSJarno Rajahalme * the reference. 641dd41d33fSJarno Rajahalme */ 642dd41d33fSJarno Rajahalme if (nf_ct_is_confirmed(ct)) 643dd41d33fSJarno Rajahalme nf_ct_delete(ct, 0, 0); 644dd41d33fSJarno Rajahalme else 645dd41d33fSJarno Rajahalme nf_conntrack_put(&ct->ct_general); 646dd41d33fSJarno Rajahalme nf_ct_set(skb, NULL, 0); 647dd41d33fSJarno Rajahalme return false; 648dd41d33fSJarno Rajahalme } 6497f8a436eSJoe Stringer 6507f8a436eSJoe Stringer return true; 6517f8a436eSJoe Stringer } 6527f8a436eSJoe Stringer 65305752523SJarno Rajahalme #ifdef CONFIG_NF_NAT_NEEDED 65405752523SJarno Rajahalme /* Modelled after nf_nat_ipv[46]_fn(). 65505752523SJarno Rajahalme * range is only used for new, uninitialized NAT state. 65605752523SJarno Rajahalme * Returns either NF_ACCEPT or NF_DROP. 65705752523SJarno Rajahalme */ 65805752523SJarno Rajahalme static int ovs_ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct, 65905752523SJarno Rajahalme enum ip_conntrack_info ctinfo, 66005752523SJarno Rajahalme const struct nf_nat_range *range, 66105752523SJarno Rajahalme enum nf_nat_manip_type maniptype) 66205752523SJarno Rajahalme { 66305752523SJarno Rajahalme int hooknum, nh_off, err = NF_ACCEPT; 66405752523SJarno Rajahalme 66505752523SJarno Rajahalme nh_off = skb_network_offset(skb); 66675f01a4cSLance Richardson skb_pull_rcsum(skb, nh_off); 66705752523SJarno Rajahalme 66805752523SJarno Rajahalme /* See HOOK2MANIP(). */ 66905752523SJarno Rajahalme if (maniptype == NF_NAT_MANIP_SRC) 67005752523SJarno Rajahalme hooknum = NF_INET_LOCAL_IN; /* Source NAT */ 67105752523SJarno Rajahalme else 67205752523SJarno Rajahalme hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */ 67305752523SJarno Rajahalme 67405752523SJarno Rajahalme switch (ctinfo) { 67505752523SJarno Rajahalme case IP_CT_RELATED: 67605752523SJarno Rajahalme case IP_CT_RELATED_REPLY: 67799b7248eSArnd Bergmann if (IS_ENABLED(CONFIG_NF_NAT_IPV4) && 67899b7248eSArnd Bergmann skb->protocol == htons(ETH_P_IP) && 67905752523SJarno Rajahalme ip_hdr(skb)->protocol == IPPROTO_ICMP) { 68005752523SJarno Rajahalme if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo, 68105752523SJarno Rajahalme hooknum)) 68205752523SJarno Rajahalme err = NF_DROP; 68305752523SJarno Rajahalme goto push; 68499b7248eSArnd Bergmann } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) && 68599b7248eSArnd Bergmann skb->protocol == htons(ETH_P_IPV6)) { 68605752523SJarno Rajahalme __be16 frag_off; 68705752523SJarno Rajahalme u8 nexthdr = ipv6_hdr(skb)->nexthdr; 68805752523SJarno Rajahalme int hdrlen = ipv6_skip_exthdr(skb, 68905752523SJarno Rajahalme sizeof(struct ipv6hdr), 69005752523SJarno Rajahalme &nexthdr, &frag_off); 69105752523SJarno Rajahalme 69205752523SJarno Rajahalme if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) { 69305752523SJarno Rajahalme if (!nf_nat_icmpv6_reply_translation(skb, ct, 69405752523SJarno Rajahalme ctinfo, 69505752523SJarno Rajahalme hooknum, 69605752523SJarno Rajahalme hdrlen)) 69705752523SJarno Rajahalme err = NF_DROP; 69805752523SJarno Rajahalme goto push; 69905752523SJarno Rajahalme } 70005752523SJarno Rajahalme } 70105752523SJarno Rajahalme /* Non-ICMP, fall thru to initialize if needed. */ 70205752523SJarno Rajahalme case IP_CT_NEW: 70305752523SJarno Rajahalme /* Seen it before? This can happen for loopback, retrans, 70405752523SJarno Rajahalme * or local packets. 70505752523SJarno Rajahalme */ 70605752523SJarno Rajahalme if (!nf_nat_initialized(ct, maniptype)) { 70705752523SJarno Rajahalme /* Initialize according to the NAT action. */ 70805752523SJarno Rajahalme err = (range && range->flags & NF_NAT_RANGE_MAP_IPS) 70905752523SJarno Rajahalme /* Action is set up to establish a new 71005752523SJarno Rajahalme * mapping. 71105752523SJarno Rajahalme */ 71205752523SJarno Rajahalme ? nf_nat_setup_info(ct, range, maniptype) 71305752523SJarno Rajahalme : nf_nat_alloc_null_binding(ct, hooknum); 71405752523SJarno Rajahalme if (err != NF_ACCEPT) 71505752523SJarno Rajahalme goto push; 71605752523SJarno Rajahalme } 71705752523SJarno Rajahalme break; 71805752523SJarno Rajahalme 71905752523SJarno Rajahalme case IP_CT_ESTABLISHED: 72005752523SJarno Rajahalme case IP_CT_ESTABLISHED_REPLY: 72105752523SJarno Rajahalme break; 72205752523SJarno Rajahalme 72305752523SJarno Rajahalme default: 72405752523SJarno Rajahalme err = NF_DROP; 72505752523SJarno Rajahalme goto push; 72605752523SJarno Rajahalme } 72705752523SJarno Rajahalme 72805752523SJarno Rajahalme err = nf_nat_packet(ct, ctinfo, hooknum, skb); 72905752523SJarno Rajahalme push: 73005752523SJarno Rajahalme skb_push(skb, nh_off); 73175f01a4cSLance Richardson skb_postpush_rcsum(skb, skb->data, nh_off); 73205752523SJarno Rajahalme 73305752523SJarno Rajahalme return err; 73405752523SJarno Rajahalme } 73505752523SJarno Rajahalme 73605752523SJarno Rajahalme static void ovs_nat_update_key(struct sw_flow_key *key, 73705752523SJarno Rajahalme const struct sk_buff *skb, 73805752523SJarno Rajahalme enum nf_nat_manip_type maniptype) 73905752523SJarno Rajahalme { 74005752523SJarno Rajahalme if (maniptype == NF_NAT_MANIP_SRC) { 74105752523SJarno Rajahalme __be16 src; 74205752523SJarno Rajahalme 743316d4d78SJarno Rajahalme key->ct_state |= OVS_CS_F_SRC_NAT; 74405752523SJarno Rajahalme if (key->eth.type == htons(ETH_P_IP)) 74505752523SJarno Rajahalme key->ipv4.addr.src = ip_hdr(skb)->saddr; 74605752523SJarno Rajahalme else if (key->eth.type == htons(ETH_P_IPV6)) 74705752523SJarno Rajahalme memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr, 74805752523SJarno Rajahalme sizeof(key->ipv6.addr.src)); 74905752523SJarno Rajahalme else 75005752523SJarno Rajahalme return; 75105752523SJarno Rajahalme 75205752523SJarno Rajahalme if (key->ip.proto == IPPROTO_UDP) 75305752523SJarno Rajahalme src = udp_hdr(skb)->source; 75405752523SJarno Rajahalme else if (key->ip.proto == IPPROTO_TCP) 75505752523SJarno Rajahalme src = tcp_hdr(skb)->source; 75605752523SJarno Rajahalme else if (key->ip.proto == IPPROTO_SCTP) 75705752523SJarno Rajahalme src = sctp_hdr(skb)->source; 75805752523SJarno Rajahalme else 75905752523SJarno Rajahalme return; 76005752523SJarno Rajahalme 76105752523SJarno Rajahalme key->tp.src = src; 76205752523SJarno Rajahalme } else { 76305752523SJarno Rajahalme __be16 dst; 76405752523SJarno Rajahalme 765316d4d78SJarno Rajahalme key->ct_state |= OVS_CS_F_DST_NAT; 76605752523SJarno Rajahalme if (key->eth.type == htons(ETH_P_IP)) 76705752523SJarno Rajahalme key->ipv4.addr.dst = ip_hdr(skb)->daddr; 76805752523SJarno Rajahalme else if (key->eth.type == htons(ETH_P_IPV6)) 76905752523SJarno Rajahalme memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr, 77005752523SJarno Rajahalme sizeof(key->ipv6.addr.dst)); 77105752523SJarno Rajahalme else 77205752523SJarno Rajahalme return; 77305752523SJarno Rajahalme 77405752523SJarno Rajahalme if (key->ip.proto == IPPROTO_UDP) 77505752523SJarno Rajahalme dst = udp_hdr(skb)->dest; 77605752523SJarno Rajahalme else if (key->ip.proto == IPPROTO_TCP) 77705752523SJarno Rajahalme dst = tcp_hdr(skb)->dest; 77805752523SJarno Rajahalme else if (key->ip.proto == IPPROTO_SCTP) 77905752523SJarno Rajahalme dst = sctp_hdr(skb)->dest; 78005752523SJarno Rajahalme else 78105752523SJarno Rajahalme return; 78205752523SJarno Rajahalme 78305752523SJarno Rajahalme key->tp.dst = dst; 78405752523SJarno Rajahalme } 78505752523SJarno Rajahalme } 78605752523SJarno Rajahalme 78705752523SJarno Rajahalme /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */ 78805752523SJarno Rajahalme static int ovs_ct_nat(struct net *net, struct sw_flow_key *key, 78905752523SJarno Rajahalme const struct ovs_conntrack_info *info, 79005752523SJarno Rajahalme struct sk_buff *skb, struct nf_conn *ct, 79105752523SJarno Rajahalme enum ip_conntrack_info ctinfo) 79205752523SJarno Rajahalme { 79305752523SJarno Rajahalme enum nf_nat_manip_type maniptype; 79405752523SJarno Rajahalme int err; 79505752523SJarno Rajahalme 79605752523SJarno Rajahalme if (nf_ct_is_untracked(ct)) { 79705752523SJarno Rajahalme /* A NAT action may only be performed on tracked packets. */ 79805752523SJarno Rajahalme return NF_ACCEPT; 79905752523SJarno Rajahalme } 80005752523SJarno Rajahalme 80105752523SJarno Rajahalme /* Add NAT extension if not confirmed yet. */ 80205752523SJarno Rajahalme if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct)) 80305752523SJarno Rajahalme return NF_ACCEPT; /* Can't NAT. */ 80405752523SJarno Rajahalme 80505752523SJarno Rajahalme /* Determine NAT type. 80605752523SJarno Rajahalme * Check if the NAT type can be deduced from the tracked connection. 8075745b0beSJarno Rajahalme * Make sure new expected connections (IP_CT_RELATED) are NATted only 8085745b0beSJarno Rajahalme * when committing. 80905752523SJarno Rajahalme */ 81005752523SJarno Rajahalme if (info->nat & OVS_CT_NAT && ctinfo != IP_CT_NEW && 81105752523SJarno Rajahalme ct->status & IPS_NAT_MASK && 8125745b0beSJarno Rajahalme (ctinfo != IP_CT_RELATED || info->commit)) { 81305752523SJarno Rajahalme /* NAT an established or related connection like before. */ 81405752523SJarno Rajahalme if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) 81505752523SJarno Rajahalme /* This is the REPLY direction for a connection 81605752523SJarno Rajahalme * for which NAT was applied in the forward 81705752523SJarno Rajahalme * direction. Do the reverse NAT. 81805752523SJarno Rajahalme */ 81905752523SJarno Rajahalme maniptype = ct->status & IPS_SRC_NAT 82005752523SJarno Rajahalme ? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC; 82105752523SJarno Rajahalme else 82205752523SJarno Rajahalme maniptype = ct->status & IPS_SRC_NAT 82305752523SJarno Rajahalme ? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST; 82405752523SJarno Rajahalme } else if (info->nat & OVS_CT_SRC_NAT) { 82505752523SJarno Rajahalme maniptype = NF_NAT_MANIP_SRC; 82605752523SJarno Rajahalme } else if (info->nat & OVS_CT_DST_NAT) { 82705752523SJarno Rajahalme maniptype = NF_NAT_MANIP_DST; 82805752523SJarno Rajahalme } else { 82905752523SJarno Rajahalme return NF_ACCEPT; /* Connection is not NATed. */ 83005752523SJarno Rajahalme } 83105752523SJarno Rajahalme err = ovs_ct_nat_execute(skb, ct, ctinfo, &info->range, maniptype); 83205752523SJarno Rajahalme 83305752523SJarno Rajahalme /* Mark NAT done if successful and update the flow key. */ 83405752523SJarno Rajahalme if (err == NF_ACCEPT) 83505752523SJarno Rajahalme ovs_nat_update_key(key, skb, maniptype); 83605752523SJarno Rajahalme 83705752523SJarno Rajahalme return err; 83805752523SJarno Rajahalme } 83905752523SJarno Rajahalme #else /* !CONFIG_NF_NAT_NEEDED */ 84005752523SJarno Rajahalme static int ovs_ct_nat(struct net *net, struct sw_flow_key *key, 84105752523SJarno Rajahalme const struct ovs_conntrack_info *info, 84205752523SJarno Rajahalme struct sk_buff *skb, struct nf_conn *ct, 84305752523SJarno Rajahalme enum ip_conntrack_info ctinfo) 84405752523SJarno Rajahalme { 84505752523SJarno Rajahalme return NF_ACCEPT; 84605752523SJarno Rajahalme } 84705752523SJarno Rajahalme #endif 84805752523SJarno Rajahalme 8499f13ded8SJarno Rajahalme /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if 850394e910eSJarno Rajahalme * not done already. Update key with new CT state after passing the packet 851394e910eSJarno Rajahalme * through conntrack. 8525e17da63SJarno Rajahalme * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be 8539f13ded8SJarno Rajahalme * set to NULL and 0 will be returned. 8549f13ded8SJarno Rajahalme */ 8554f0909eeSJoe Stringer static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key, 8567f8a436eSJoe Stringer const struct ovs_conntrack_info *info, 8577f8a436eSJoe Stringer struct sk_buff *skb) 8587f8a436eSJoe Stringer { 8597f8a436eSJoe Stringer /* If we are recirculating packets to match on conntrack fields and 8607f8a436eSJoe Stringer * committing with a separate conntrack action, then we don't need to 8617f8a436eSJoe Stringer * actually run the packet through conntrack twice unless it's for a 8627f8a436eSJoe Stringer * different zone. 8637f8a436eSJoe Stringer */ 86428b6e0c1SJarno Rajahalme bool cached = skb_nfct_cached(net, key, info, skb); 86528b6e0c1SJarno Rajahalme enum ip_conntrack_info ctinfo; 86628b6e0c1SJarno Rajahalme struct nf_conn *ct; 86728b6e0c1SJarno Rajahalme 86828b6e0c1SJarno Rajahalme if (!cached) { 8697f8a436eSJoe Stringer struct nf_conn *tmpl = info->ct; 8705b6b9293SJarno Rajahalme int err; 8717f8a436eSJoe Stringer 8727f8a436eSJoe Stringer /* Associate skb with specified zone. */ 8737f8a436eSJoe Stringer if (tmpl) { 874cb9c6836SFlorian Westphal if (skb_nfct(skb)) 875cb9c6836SFlorian Westphal nf_conntrack_put(skb_nfct(skb)); 8767f8a436eSJoe Stringer nf_conntrack_get(&tmpl->ct_general); 877c74454faSFlorian Westphal nf_ct_set(skb, tmpl, IP_CT_NEW); 8787f8a436eSJoe Stringer } 8797f8a436eSJoe Stringer 8805b6b9293SJarno Rajahalme err = nf_conntrack_in(net, info->family, 8815b6b9293SJarno Rajahalme NF_INET_PRE_ROUTING, skb); 8825b6b9293SJarno Rajahalme if (err != NF_ACCEPT) 8837f8a436eSJoe Stringer return -ENOENT; 884cae3a262SJoe Stringer 88505752523SJarno Rajahalme /* Clear CT state NAT flags to mark that we have not yet done 88605752523SJarno Rajahalme * NAT after the nf_conntrack_in() call. We can actually clear 88705752523SJarno Rajahalme * the whole state, as it will be re-initialized below. 88805752523SJarno Rajahalme */ 889316d4d78SJarno Rajahalme key->ct_state = 0; 89005752523SJarno Rajahalme 89105752523SJarno Rajahalme /* Update the key, but keep the NAT flags. */ 89205752523SJarno Rajahalme ovs_ct_update_key(skb, info, key, true, true); 89305752523SJarno Rajahalme } 89405752523SJarno Rajahalme 89505752523SJarno Rajahalme ct = nf_ct_get(skb, &ctinfo); 89605752523SJarno Rajahalme if (ct) { 89705752523SJarno Rajahalme /* Packets starting a new connection must be NATted before the 89805752523SJarno Rajahalme * helper, so that the helper knows about the NAT. We enforce 89905752523SJarno Rajahalme * this by delaying both NAT and helper calls for unconfirmed 90005752523SJarno Rajahalme * connections until the committing CT action. For later 90105752523SJarno Rajahalme * packets NAT and Helper may be called in either order. 90205752523SJarno Rajahalme * 90305752523SJarno Rajahalme * NAT will be done only if the CT action has NAT, and only 90405752523SJarno Rajahalme * once per packet (per zone), as guarded by the NAT bits in 905316d4d78SJarno Rajahalme * the key->ct_state. 90605752523SJarno Rajahalme */ 907316d4d78SJarno Rajahalme if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) && 90805752523SJarno Rajahalme (nf_ct_is_confirmed(ct) || info->commit) && 90905752523SJarno Rajahalme ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) { 91005752523SJarno Rajahalme return -EINVAL; 91128b6e0c1SJarno Rajahalme } 912394e910eSJarno Rajahalme 91316ec3d4fSJoe Stringer /* Userspace may decide to perform a ct lookup without a helper 91416ec3d4fSJoe Stringer * specified followed by a (recirculate and) commit with one. 91516ec3d4fSJoe Stringer * Therefore, for unconfirmed connections which we will commit, 91616ec3d4fSJoe Stringer * we need to attach the helper here. 91716ec3d4fSJoe Stringer */ 91816ec3d4fSJoe Stringer if (!nf_ct_is_confirmed(ct) && info->commit && 91916ec3d4fSJoe Stringer info->helper && !nfct_help(ct)) { 92016ec3d4fSJoe Stringer int err = __nf_ct_try_assign_helper(ct, info->ct, 92116ec3d4fSJoe Stringer GFP_ATOMIC); 92216ec3d4fSJoe Stringer if (err) 92316ec3d4fSJoe Stringer return err; 92416ec3d4fSJoe Stringer } 92516ec3d4fSJoe Stringer 92628b6e0c1SJarno Rajahalme /* Call the helper only if: 92705752523SJarno Rajahalme * - nf_conntrack_in() was executed above ("!cached") for a 92805752523SJarno Rajahalme * confirmed connection, or 92928b6e0c1SJarno Rajahalme * - When committing an unconfirmed connection. 93028b6e0c1SJarno Rajahalme */ 93105752523SJarno Rajahalme if ((nf_ct_is_confirmed(ct) ? !cached : info->commit) && 93228b6e0c1SJarno Rajahalme ovs_ct_helper(skb, info->family) != NF_ACCEPT) { 933cae3a262SJoe Stringer return -EINVAL; 934cae3a262SJoe Stringer } 93505752523SJarno Rajahalme } 9367f8a436eSJoe Stringer 9377f8a436eSJoe Stringer return 0; 9387f8a436eSJoe Stringer } 9397f8a436eSJoe Stringer 9407f8a436eSJoe Stringer /* Lookup connection and read fields into key. */ 9417f8a436eSJoe Stringer static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key, 9427f8a436eSJoe Stringer const struct ovs_conntrack_info *info, 9437f8a436eSJoe Stringer struct sk_buff *skb) 9447f8a436eSJoe Stringer { 9457f8a436eSJoe Stringer struct nf_conntrack_expect *exp; 9467f8a436eSJoe Stringer 9479f13ded8SJarno Rajahalme /* If we pass an expected packet through nf_conntrack_in() the 9489f13ded8SJarno Rajahalme * expectation is typically removed, but the packet could still be 9499f13ded8SJarno Rajahalme * lost in upcall processing. To prevent this from happening we 9509f13ded8SJarno Rajahalme * perform an explicit expectation lookup. Expected connections are 9519f13ded8SJarno Rajahalme * always new, and will be passed through conntrack only when they are 9529f13ded8SJarno Rajahalme * committed, as it is OK to remove the expectation at that time. 9539f13ded8SJarno Rajahalme */ 9547f8a436eSJoe Stringer exp = ovs_ct_expect_find(net, &info->zone, info->family, skb); 9557f8a436eSJoe Stringer if (exp) { 9567f8a436eSJoe Stringer u8 state; 9577f8a436eSJoe Stringer 95805752523SJarno Rajahalme /* NOTE: New connections are NATted and Helped only when 95905752523SJarno Rajahalme * committed, so we are not calling into NAT here. 96005752523SJarno Rajahalme */ 9617f8a436eSJoe Stringer state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED; 962182e3042SJoe Stringer __ovs_ct_update_key(key, state, &info->zone, exp->master); 963d913d3a7SSamuel Gauthier } else { 964d913d3a7SSamuel Gauthier struct nf_conn *ct; 965d913d3a7SSamuel Gauthier int err; 966d913d3a7SSamuel Gauthier 967d913d3a7SSamuel Gauthier err = __ovs_ct_lookup(net, key, info, skb); 968d913d3a7SSamuel Gauthier if (err) 969d913d3a7SSamuel Gauthier return err; 970d913d3a7SSamuel Gauthier 971cb9c6836SFlorian Westphal ct = (struct nf_conn *)skb_nfct(skb); 972d913d3a7SSamuel Gauthier if (ct) 973d913d3a7SSamuel Gauthier nf_ct_deliver_cached_events(ct); 974d913d3a7SSamuel Gauthier } 9757f8a436eSJoe Stringer 9767f8a436eSJoe Stringer return 0; 9777f8a436eSJoe Stringer } 9787f8a436eSJoe Stringer 97933db4125SJoe Stringer static bool labels_nonzero(const struct ovs_key_ct_labels *labels) 980c2ac6673SJoe Stringer { 981c2ac6673SJoe Stringer size_t i; 982c2ac6673SJoe Stringer 983cb80d58fSJarno Rajahalme for (i = 0; i < OVS_CT_LABELS_LEN_32; i++) 984cb80d58fSJarno Rajahalme if (labels->ct_labels_32[i]) 985c2ac6673SJoe Stringer return true; 986c2ac6673SJoe Stringer 987c2ac6673SJoe Stringer return false; 988c2ac6673SJoe Stringer } 989c2ac6673SJoe Stringer 9907d904c7bSJarno Rajahalme /* Lookup connection and confirm if unconfirmed. */ 9917d904c7bSJarno Rajahalme static int ovs_ct_commit(struct net *net, struct sw_flow_key *key, 9927d904c7bSJarno Rajahalme const struct ovs_conntrack_info *info, 9937d904c7bSJarno Rajahalme struct sk_buff *skb) 9947d904c7bSJarno Rajahalme { 9956ffcea79SJarno Rajahalme enum ip_conntrack_info ctinfo; 9966ffcea79SJarno Rajahalme struct nf_conn *ct; 9977d904c7bSJarno Rajahalme int err; 9987d904c7bSJarno Rajahalme 9997d904c7bSJarno Rajahalme err = __ovs_ct_lookup(net, key, info, skb); 10007d904c7bSJarno Rajahalme if (err) 10017d904c7bSJarno Rajahalme return err; 10027d904c7bSJarno Rajahalme 10036ffcea79SJarno Rajahalme /* The connection could be invalid, in which case this is a no-op.*/ 10046ffcea79SJarno Rajahalme ct = nf_ct_get(skb, &ctinfo); 10056ffcea79SJarno Rajahalme if (!ct) 10066ffcea79SJarno Rajahalme return 0; 10076ffcea79SJarno Rajahalme 10087d904c7bSJarno Rajahalme /* Apply changes before confirming the connection so that the initial 10097d904c7bSJarno Rajahalme * conntrack NEW netlink event carries the values given in the CT 10107d904c7bSJarno Rajahalme * action. 10117d904c7bSJarno Rajahalme */ 10127d904c7bSJarno Rajahalme if (info->mark.mask) { 10136ffcea79SJarno Rajahalme err = ovs_ct_set_mark(ct, key, info->mark.value, 10147d904c7bSJarno Rajahalme info->mark.mask); 10157d904c7bSJarno Rajahalme if (err) 10167d904c7bSJarno Rajahalme return err; 10177d904c7bSJarno Rajahalme } 101809aa98adSJarno Rajahalme if (!nf_ct_is_confirmed(ct)) { 10196ffcea79SJarno Rajahalme err = ovs_ct_init_labels(ct, key, &info->labels.value, 10206ffcea79SJarno Rajahalme &info->labels.mask); 102109aa98adSJarno Rajahalme if (err) 102209aa98adSJarno Rajahalme return err; 102309aa98adSJarno Rajahalme } else if (labels_nonzero(&info->labels.mask)) { 10246ffcea79SJarno Rajahalme err = ovs_ct_set_labels(ct, key, &info->labels.value, 10257d904c7bSJarno Rajahalme &info->labels.mask); 10267d904c7bSJarno Rajahalme if (err) 10277d904c7bSJarno Rajahalme return err; 10287d904c7bSJarno Rajahalme } 10297d904c7bSJarno Rajahalme /* This will take care of sending queued events even if the connection 10307d904c7bSJarno Rajahalme * is already confirmed. 10317d904c7bSJarno Rajahalme */ 10327d904c7bSJarno Rajahalme if (nf_conntrack_confirm(skb) != NF_ACCEPT) 10337d904c7bSJarno Rajahalme return -EINVAL; 10347d904c7bSJarno Rajahalme 10357d904c7bSJarno Rajahalme return 0; 10367d904c7bSJarno Rajahalme } 10377d904c7bSJarno Rajahalme 103874c16618SJoe Stringer /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero 103974c16618SJoe Stringer * value if 'skb' is freed. 104074c16618SJoe Stringer */ 10417f8a436eSJoe Stringer int ovs_ct_execute(struct net *net, struct sk_buff *skb, 10427f8a436eSJoe Stringer struct sw_flow_key *key, 10437f8a436eSJoe Stringer const struct ovs_conntrack_info *info) 10447f8a436eSJoe Stringer { 10457f8a436eSJoe Stringer int nh_ofs; 10467f8a436eSJoe Stringer int err; 10477f8a436eSJoe Stringer 10487f8a436eSJoe Stringer /* The conntrack module expects to be working at L3. */ 10497f8a436eSJoe Stringer nh_ofs = skb_network_offset(skb); 105075f01a4cSLance Richardson skb_pull_rcsum(skb, nh_ofs); 10517f8a436eSJoe Stringer 10527f8a436eSJoe Stringer if (key->ip.frag != OVS_FRAG_TYPE_NONE) { 10537f8a436eSJoe Stringer err = handle_fragments(net, key, info->zone.id, skb); 10547f8a436eSJoe Stringer if (err) 10557f8a436eSJoe Stringer return err; 10567f8a436eSJoe Stringer } 10577f8a436eSJoe Stringer 1058ab38a7b5SJoe Stringer if (info->commit) 10597d904c7bSJarno Rajahalme err = ovs_ct_commit(net, key, info, skb); 10607f8a436eSJoe Stringer else 10617f8a436eSJoe Stringer err = ovs_ct_lookup(net, key, info, skb); 10627f8a436eSJoe Stringer 10637f8a436eSJoe Stringer skb_push(skb, nh_ofs); 106475f01a4cSLance Richardson skb_postpush_rcsum(skb, skb->data, nh_ofs); 106574c16618SJoe Stringer if (err) 106674c16618SJoe Stringer kfree_skb(skb); 10677f8a436eSJoe Stringer return err; 10687f8a436eSJoe Stringer } 10697f8a436eSJoe Stringer 1070cae3a262SJoe Stringer static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name, 1071cae3a262SJoe Stringer const struct sw_flow_key *key, bool log) 1072cae3a262SJoe Stringer { 1073cae3a262SJoe Stringer struct nf_conntrack_helper *helper; 1074cae3a262SJoe Stringer struct nf_conn_help *help; 1075cae3a262SJoe Stringer 1076cae3a262SJoe Stringer helper = nf_conntrack_helper_try_module_get(name, info->family, 1077cae3a262SJoe Stringer key->ip.proto); 1078cae3a262SJoe Stringer if (!helper) { 1079cae3a262SJoe Stringer OVS_NLERR(log, "Unknown helper \"%s\"", name); 1080cae3a262SJoe Stringer return -EINVAL; 1081cae3a262SJoe Stringer } 1082cae3a262SJoe Stringer 1083cae3a262SJoe Stringer help = nf_ct_helper_ext_add(info->ct, helper, GFP_KERNEL); 1084cae3a262SJoe Stringer if (!help) { 1085cae3a262SJoe Stringer module_put(helper->me); 1086cae3a262SJoe Stringer return -ENOMEM; 1087cae3a262SJoe Stringer } 1088cae3a262SJoe Stringer 1089cae3a262SJoe Stringer rcu_assign_pointer(help->helper, helper); 1090cae3a262SJoe Stringer info->helper = helper; 1091cae3a262SJoe Stringer return 0; 1092cae3a262SJoe Stringer } 1093cae3a262SJoe Stringer 109405752523SJarno Rajahalme #ifdef CONFIG_NF_NAT_NEEDED 109505752523SJarno Rajahalme static int parse_nat(const struct nlattr *attr, 109605752523SJarno Rajahalme struct ovs_conntrack_info *info, bool log) 109705752523SJarno Rajahalme { 109805752523SJarno Rajahalme struct nlattr *a; 109905752523SJarno Rajahalme int rem; 110005752523SJarno Rajahalme bool have_ip_max = false; 110105752523SJarno Rajahalme bool have_proto_max = false; 110205752523SJarno Rajahalme bool ip_vers = (info->family == NFPROTO_IPV6); 110305752523SJarno Rajahalme 110405752523SJarno Rajahalme nla_for_each_nested(a, attr, rem) { 110505752523SJarno Rajahalme static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = { 110605752523SJarno Rajahalme [OVS_NAT_ATTR_SRC] = {0, 0}, 110705752523SJarno Rajahalme [OVS_NAT_ATTR_DST] = {0, 0}, 110805752523SJarno Rajahalme [OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr), 110905752523SJarno Rajahalme sizeof(struct in6_addr)}, 111005752523SJarno Rajahalme [OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr), 111105752523SJarno Rajahalme sizeof(struct in6_addr)}, 111205752523SJarno Rajahalme [OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)}, 111305752523SJarno Rajahalme [OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)}, 111405752523SJarno Rajahalme [OVS_NAT_ATTR_PERSISTENT] = {0, 0}, 111505752523SJarno Rajahalme [OVS_NAT_ATTR_PROTO_HASH] = {0, 0}, 111605752523SJarno Rajahalme [OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0}, 111705752523SJarno Rajahalme }; 111805752523SJarno Rajahalme int type = nla_type(a); 111905752523SJarno Rajahalme 112005752523SJarno Rajahalme if (type > OVS_NAT_ATTR_MAX) { 112105752523SJarno Rajahalme OVS_NLERR(log, 112205752523SJarno Rajahalme "Unknown NAT attribute (type=%d, max=%d).\n", 112305752523SJarno Rajahalme type, OVS_NAT_ATTR_MAX); 112405752523SJarno Rajahalme return -EINVAL; 112505752523SJarno Rajahalme } 112605752523SJarno Rajahalme 112705752523SJarno Rajahalme if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) { 112805752523SJarno Rajahalme OVS_NLERR(log, 112905752523SJarno Rajahalme "NAT attribute type %d has unexpected length (%d != %d).\n", 113005752523SJarno Rajahalme type, nla_len(a), 113105752523SJarno Rajahalme ovs_nat_attr_lens[type][ip_vers]); 113205752523SJarno Rajahalme return -EINVAL; 113305752523SJarno Rajahalme } 113405752523SJarno Rajahalme 113505752523SJarno Rajahalme switch (type) { 113605752523SJarno Rajahalme case OVS_NAT_ATTR_SRC: 113705752523SJarno Rajahalme case OVS_NAT_ATTR_DST: 113805752523SJarno Rajahalme if (info->nat) { 113905752523SJarno Rajahalme OVS_NLERR(log, 114005752523SJarno Rajahalme "Only one type of NAT may be specified.\n" 114105752523SJarno Rajahalme ); 114205752523SJarno Rajahalme return -ERANGE; 114305752523SJarno Rajahalme } 114405752523SJarno Rajahalme info->nat |= OVS_CT_NAT; 114505752523SJarno Rajahalme info->nat |= ((type == OVS_NAT_ATTR_SRC) 114605752523SJarno Rajahalme ? OVS_CT_SRC_NAT : OVS_CT_DST_NAT); 114705752523SJarno Rajahalme break; 114805752523SJarno Rajahalme 114905752523SJarno Rajahalme case OVS_NAT_ATTR_IP_MIN: 1150ac71b46eSHaishuang Yan nla_memcpy(&info->range.min_addr, a, 1151ac71b46eSHaishuang Yan sizeof(info->range.min_addr)); 115205752523SJarno Rajahalme info->range.flags |= NF_NAT_RANGE_MAP_IPS; 115305752523SJarno Rajahalme break; 115405752523SJarno Rajahalme 115505752523SJarno Rajahalme case OVS_NAT_ATTR_IP_MAX: 115605752523SJarno Rajahalme have_ip_max = true; 115705752523SJarno Rajahalme nla_memcpy(&info->range.max_addr, a, 115805752523SJarno Rajahalme sizeof(info->range.max_addr)); 115905752523SJarno Rajahalme info->range.flags |= NF_NAT_RANGE_MAP_IPS; 116005752523SJarno Rajahalme break; 116105752523SJarno Rajahalme 116205752523SJarno Rajahalme case OVS_NAT_ATTR_PROTO_MIN: 116305752523SJarno Rajahalme info->range.min_proto.all = htons(nla_get_u16(a)); 116405752523SJarno Rajahalme info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; 116505752523SJarno Rajahalme break; 116605752523SJarno Rajahalme 116705752523SJarno Rajahalme case OVS_NAT_ATTR_PROTO_MAX: 116805752523SJarno Rajahalme have_proto_max = true; 116905752523SJarno Rajahalme info->range.max_proto.all = htons(nla_get_u16(a)); 117005752523SJarno Rajahalme info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; 117105752523SJarno Rajahalme break; 117205752523SJarno Rajahalme 117305752523SJarno Rajahalme case OVS_NAT_ATTR_PERSISTENT: 117405752523SJarno Rajahalme info->range.flags |= NF_NAT_RANGE_PERSISTENT; 117505752523SJarno Rajahalme break; 117605752523SJarno Rajahalme 117705752523SJarno Rajahalme case OVS_NAT_ATTR_PROTO_HASH: 117805752523SJarno Rajahalme info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM; 117905752523SJarno Rajahalme break; 118005752523SJarno Rajahalme 118105752523SJarno Rajahalme case OVS_NAT_ATTR_PROTO_RANDOM: 118205752523SJarno Rajahalme info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY; 118305752523SJarno Rajahalme break; 118405752523SJarno Rajahalme 118505752523SJarno Rajahalme default: 118605752523SJarno Rajahalme OVS_NLERR(log, "Unknown nat attribute (%d).\n", type); 118705752523SJarno Rajahalme return -EINVAL; 118805752523SJarno Rajahalme } 118905752523SJarno Rajahalme } 119005752523SJarno Rajahalme 119105752523SJarno Rajahalme if (rem > 0) { 119205752523SJarno Rajahalme OVS_NLERR(log, "NAT attribute has %d unknown bytes.\n", rem); 119305752523SJarno Rajahalme return -EINVAL; 119405752523SJarno Rajahalme } 119505752523SJarno Rajahalme if (!info->nat) { 119605752523SJarno Rajahalme /* Do not allow flags if no type is given. */ 119705752523SJarno Rajahalme if (info->range.flags) { 119805752523SJarno Rajahalme OVS_NLERR(log, 119905752523SJarno Rajahalme "NAT flags may be given only when NAT range (SRC or DST) is also specified.\n" 120005752523SJarno Rajahalme ); 120105752523SJarno Rajahalme return -EINVAL; 120205752523SJarno Rajahalme } 120305752523SJarno Rajahalme info->nat = OVS_CT_NAT; /* NAT existing connections. */ 120405752523SJarno Rajahalme } else if (!info->commit) { 120505752523SJarno Rajahalme OVS_NLERR(log, 120605752523SJarno Rajahalme "NAT attributes may be specified only when CT COMMIT flag is also specified.\n" 120705752523SJarno Rajahalme ); 120805752523SJarno Rajahalme return -EINVAL; 120905752523SJarno Rajahalme } 121005752523SJarno Rajahalme /* Allow missing IP_MAX. */ 121105752523SJarno Rajahalme if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) { 121205752523SJarno Rajahalme memcpy(&info->range.max_addr, &info->range.min_addr, 121305752523SJarno Rajahalme sizeof(info->range.max_addr)); 121405752523SJarno Rajahalme } 121505752523SJarno Rajahalme /* Allow missing PROTO_MAX. */ 121605752523SJarno Rajahalme if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED && 121705752523SJarno Rajahalme !have_proto_max) { 121805752523SJarno Rajahalme info->range.max_proto.all = info->range.min_proto.all; 121905752523SJarno Rajahalme } 122005752523SJarno Rajahalme return 0; 122105752523SJarno Rajahalme } 122205752523SJarno Rajahalme #endif 122305752523SJarno Rajahalme 12247f8a436eSJoe Stringer static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = { 1225ab38a7b5SJoe Stringer [OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 }, 1226dd41d33fSJarno Rajahalme [OVS_CT_ATTR_FORCE_COMMIT] = { .minlen = 0, .maxlen = 0 }, 12277f8a436eSJoe Stringer [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16), 12287f8a436eSJoe Stringer .maxlen = sizeof(u16) }, 1229182e3042SJoe Stringer [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark), 1230182e3042SJoe Stringer .maxlen = sizeof(struct md_mark) }, 123133db4125SJoe Stringer [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels), 123233db4125SJoe Stringer .maxlen = sizeof(struct md_labels) }, 1233cae3a262SJoe Stringer [OVS_CT_ATTR_HELPER] = { .minlen = 1, 123405752523SJarno Rajahalme .maxlen = NF_CT_HELPER_NAME_LEN }, 123505752523SJarno Rajahalme #ifdef CONFIG_NF_NAT_NEEDED 123605752523SJarno Rajahalme /* NAT length is checked when parsing the nested attributes. */ 123705752523SJarno Rajahalme [OVS_CT_ATTR_NAT] = { .minlen = 0, .maxlen = INT_MAX }, 123805752523SJarno Rajahalme #endif 12397f8a436eSJoe Stringer }; 12407f8a436eSJoe Stringer 12417f8a436eSJoe Stringer static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info, 1242cae3a262SJoe Stringer const char **helper, bool log) 12437f8a436eSJoe Stringer { 12447f8a436eSJoe Stringer struct nlattr *a; 12457f8a436eSJoe Stringer int rem; 12467f8a436eSJoe Stringer 12477f8a436eSJoe Stringer nla_for_each_nested(a, attr, rem) { 12487f8a436eSJoe Stringer int type = nla_type(a); 12497f8a436eSJoe Stringer int maxlen = ovs_ct_attr_lens[type].maxlen; 12507f8a436eSJoe Stringer int minlen = ovs_ct_attr_lens[type].minlen; 12517f8a436eSJoe Stringer 12527f8a436eSJoe Stringer if (type > OVS_CT_ATTR_MAX) { 12537f8a436eSJoe Stringer OVS_NLERR(log, 12547f8a436eSJoe Stringer "Unknown conntrack attr (type=%d, max=%d)", 12557f8a436eSJoe Stringer type, OVS_CT_ATTR_MAX); 12567f8a436eSJoe Stringer return -EINVAL; 12577f8a436eSJoe Stringer } 12587f8a436eSJoe Stringer if (nla_len(a) < minlen || nla_len(a) > maxlen) { 12597f8a436eSJoe Stringer OVS_NLERR(log, 12607f8a436eSJoe Stringer "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)", 12617f8a436eSJoe Stringer type, nla_len(a), maxlen); 12627f8a436eSJoe Stringer return -EINVAL; 12637f8a436eSJoe Stringer } 12647f8a436eSJoe Stringer 12657f8a436eSJoe Stringer switch (type) { 1266dd41d33fSJarno Rajahalme case OVS_CT_ATTR_FORCE_COMMIT: 1267dd41d33fSJarno Rajahalme info->force = true; 1268dd41d33fSJarno Rajahalme /* fall through. */ 1269ab38a7b5SJoe Stringer case OVS_CT_ATTR_COMMIT: 1270ab38a7b5SJoe Stringer info->commit = true; 12717f8a436eSJoe Stringer break; 12727f8a436eSJoe Stringer #ifdef CONFIG_NF_CONNTRACK_ZONES 12737f8a436eSJoe Stringer case OVS_CT_ATTR_ZONE: 12747f8a436eSJoe Stringer info->zone.id = nla_get_u16(a); 12757f8a436eSJoe Stringer break; 12767f8a436eSJoe Stringer #endif 1277182e3042SJoe Stringer #ifdef CONFIG_NF_CONNTRACK_MARK 1278182e3042SJoe Stringer case OVS_CT_ATTR_MARK: { 1279182e3042SJoe Stringer struct md_mark *mark = nla_data(a); 1280182e3042SJoe Stringer 1281e754ec69SJoe Stringer if (!mark->mask) { 1282e754ec69SJoe Stringer OVS_NLERR(log, "ct_mark mask cannot be 0"); 1283e754ec69SJoe Stringer return -EINVAL; 1284e754ec69SJoe Stringer } 1285182e3042SJoe Stringer info->mark = *mark; 1286182e3042SJoe Stringer break; 1287182e3042SJoe Stringer } 1288182e3042SJoe Stringer #endif 1289c2ac6673SJoe Stringer #ifdef CONFIG_NF_CONNTRACK_LABELS 129033db4125SJoe Stringer case OVS_CT_ATTR_LABELS: { 129133db4125SJoe Stringer struct md_labels *labels = nla_data(a); 1292c2ac6673SJoe Stringer 1293e754ec69SJoe Stringer if (!labels_nonzero(&labels->mask)) { 1294e754ec69SJoe Stringer OVS_NLERR(log, "ct_labels mask cannot be 0"); 1295e754ec69SJoe Stringer return -EINVAL; 1296e754ec69SJoe Stringer } 129733db4125SJoe Stringer info->labels = *labels; 1298c2ac6673SJoe Stringer break; 1299c2ac6673SJoe Stringer } 1300c2ac6673SJoe Stringer #endif 1301cae3a262SJoe Stringer case OVS_CT_ATTR_HELPER: 1302cae3a262SJoe Stringer *helper = nla_data(a); 1303cae3a262SJoe Stringer if (!memchr(*helper, '\0', nla_len(a))) { 1304cae3a262SJoe Stringer OVS_NLERR(log, "Invalid conntrack helper"); 1305cae3a262SJoe Stringer return -EINVAL; 1306cae3a262SJoe Stringer } 1307cae3a262SJoe Stringer break; 130805752523SJarno Rajahalme #ifdef CONFIG_NF_NAT_NEEDED 130905752523SJarno Rajahalme case OVS_CT_ATTR_NAT: { 131005752523SJarno Rajahalme int err = parse_nat(a, info, log); 131105752523SJarno Rajahalme 131205752523SJarno Rajahalme if (err) 131305752523SJarno Rajahalme return err; 131405752523SJarno Rajahalme break; 131505752523SJarno Rajahalme } 131605752523SJarno Rajahalme #endif 13177f8a436eSJoe Stringer default: 13187f8a436eSJoe Stringer OVS_NLERR(log, "Unknown conntrack attr (%d)", 13197f8a436eSJoe Stringer type); 13207f8a436eSJoe Stringer return -EINVAL; 13217f8a436eSJoe Stringer } 13227f8a436eSJoe Stringer } 13237f8a436eSJoe Stringer 13247d904c7bSJarno Rajahalme #ifdef CONFIG_NF_CONNTRACK_MARK 13257d904c7bSJarno Rajahalme if (!info->commit && info->mark.mask) { 13267d904c7bSJarno Rajahalme OVS_NLERR(log, 13277d904c7bSJarno Rajahalme "Setting conntrack mark requires 'commit' flag."); 13287d904c7bSJarno Rajahalme return -EINVAL; 13297d904c7bSJarno Rajahalme } 13307d904c7bSJarno Rajahalme #endif 13317d904c7bSJarno Rajahalme #ifdef CONFIG_NF_CONNTRACK_LABELS 13327d904c7bSJarno Rajahalme if (!info->commit && labels_nonzero(&info->labels.mask)) { 13337d904c7bSJarno Rajahalme OVS_NLERR(log, 13347d904c7bSJarno Rajahalme "Setting conntrack labels requires 'commit' flag."); 13357d904c7bSJarno Rajahalme return -EINVAL; 13367d904c7bSJarno Rajahalme } 13377d904c7bSJarno Rajahalme #endif 13387f8a436eSJoe Stringer if (rem > 0) { 13397f8a436eSJoe Stringer OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem); 13407f8a436eSJoe Stringer return -EINVAL; 13417f8a436eSJoe Stringer } 13427f8a436eSJoe Stringer 13437f8a436eSJoe Stringer return 0; 13447f8a436eSJoe Stringer } 13457f8a436eSJoe Stringer 1346c2ac6673SJoe Stringer bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr) 13477f8a436eSJoe Stringer { 13487f8a436eSJoe Stringer if (attr == OVS_KEY_ATTR_CT_STATE) 13497f8a436eSJoe Stringer return true; 13507f8a436eSJoe Stringer if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && 13517f8a436eSJoe Stringer attr == OVS_KEY_ATTR_CT_ZONE) 13527f8a436eSJoe Stringer return true; 1353182e3042SJoe Stringer if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && 1354182e3042SJoe Stringer attr == OVS_KEY_ATTR_CT_MARK) 1355182e3042SJoe Stringer return true; 1356c2ac6673SJoe Stringer if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 135733db4125SJoe Stringer attr == OVS_KEY_ATTR_CT_LABELS) { 1358c2ac6673SJoe Stringer struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1359c2ac6673SJoe Stringer 1360c2ac6673SJoe Stringer return ovs_net->xt_label; 1361c2ac6673SJoe Stringer } 13627f8a436eSJoe Stringer 13637f8a436eSJoe Stringer return false; 13647f8a436eSJoe Stringer } 13657f8a436eSJoe Stringer 13667f8a436eSJoe Stringer int ovs_ct_copy_action(struct net *net, const struct nlattr *attr, 13677f8a436eSJoe Stringer const struct sw_flow_key *key, 13687f8a436eSJoe Stringer struct sw_flow_actions **sfa, bool log) 13697f8a436eSJoe Stringer { 13707f8a436eSJoe Stringer struct ovs_conntrack_info ct_info; 1371cae3a262SJoe Stringer const char *helper = NULL; 13727f8a436eSJoe Stringer u16 family; 13737f8a436eSJoe Stringer int err; 13747f8a436eSJoe Stringer 13757f8a436eSJoe Stringer family = key_to_nfproto(key); 13767f8a436eSJoe Stringer if (family == NFPROTO_UNSPEC) { 13777f8a436eSJoe Stringer OVS_NLERR(log, "ct family unspecified"); 13787f8a436eSJoe Stringer return -EINVAL; 13797f8a436eSJoe Stringer } 13807f8a436eSJoe Stringer 13817f8a436eSJoe Stringer memset(&ct_info, 0, sizeof(ct_info)); 13827f8a436eSJoe Stringer ct_info.family = family; 13837f8a436eSJoe Stringer 13847f8a436eSJoe Stringer nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID, 13857f8a436eSJoe Stringer NF_CT_DEFAULT_ZONE_DIR, 0); 13867f8a436eSJoe Stringer 1387cae3a262SJoe Stringer err = parse_ct(attr, &ct_info, &helper, log); 13887f8a436eSJoe Stringer if (err) 13897f8a436eSJoe Stringer return err; 13907f8a436eSJoe Stringer 13917f8a436eSJoe Stringer /* Set up template for tracking connections in specific zones. */ 13927f8a436eSJoe Stringer ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL); 13937f8a436eSJoe Stringer if (!ct_info.ct) { 13947f8a436eSJoe Stringer OVS_NLERR(log, "Failed to allocate conntrack template"); 13957f8a436eSJoe Stringer return -ENOMEM; 13967f8a436eSJoe Stringer } 139790c7afc9SJoe Stringer 139890c7afc9SJoe Stringer __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status); 139990c7afc9SJoe Stringer nf_conntrack_get(&ct_info.ct->ct_general); 140090c7afc9SJoe Stringer 1401cae3a262SJoe Stringer if (helper) { 1402cae3a262SJoe Stringer err = ovs_ct_add_helper(&ct_info, helper, key, log); 1403cae3a262SJoe Stringer if (err) 1404cae3a262SJoe Stringer goto err_free_ct; 1405cae3a262SJoe Stringer } 14067f8a436eSJoe Stringer 14077f8a436eSJoe Stringer err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info, 14087f8a436eSJoe Stringer sizeof(ct_info), log); 14097f8a436eSJoe Stringer if (err) 14107f8a436eSJoe Stringer goto err_free_ct; 14117f8a436eSJoe Stringer 14127f8a436eSJoe Stringer return 0; 14137f8a436eSJoe Stringer err_free_ct: 14142f3ab9f9SJoe Stringer __ovs_ct_free_action(&ct_info); 14157f8a436eSJoe Stringer return err; 14167f8a436eSJoe Stringer } 14177f8a436eSJoe Stringer 141805752523SJarno Rajahalme #ifdef CONFIG_NF_NAT_NEEDED 141905752523SJarno Rajahalme static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info, 142005752523SJarno Rajahalme struct sk_buff *skb) 142105752523SJarno Rajahalme { 142205752523SJarno Rajahalme struct nlattr *start; 142305752523SJarno Rajahalme 142405752523SJarno Rajahalme start = nla_nest_start(skb, OVS_CT_ATTR_NAT); 142505752523SJarno Rajahalme if (!start) 142605752523SJarno Rajahalme return false; 142705752523SJarno Rajahalme 142805752523SJarno Rajahalme if (info->nat & OVS_CT_SRC_NAT) { 142905752523SJarno Rajahalme if (nla_put_flag(skb, OVS_NAT_ATTR_SRC)) 143005752523SJarno Rajahalme return false; 143105752523SJarno Rajahalme } else if (info->nat & OVS_CT_DST_NAT) { 143205752523SJarno Rajahalme if (nla_put_flag(skb, OVS_NAT_ATTR_DST)) 143305752523SJarno Rajahalme return false; 143405752523SJarno Rajahalme } else { 143505752523SJarno Rajahalme goto out; 143605752523SJarno Rajahalme } 143705752523SJarno Rajahalme 143805752523SJarno Rajahalme if (info->range.flags & NF_NAT_RANGE_MAP_IPS) { 143999b7248eSArnd Bergmann if (IS_ENABLED(CONFIG_NF_NAT_IPV4) && 144099b7248eSArnd Bergmann info->family == NFPROTO_IPV4) { 144105752523SJarno Rajahalme if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN, 144205752523SJarno Rajahalme info->range.min_addr.ip) || 144305752523SJarno Rajahalme (info->range.max_addr.ip 144405752523SJarno Rajahalme != info->range.min_addr.ip && 144505752523SJarno Rajahalme (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX, 144605752523SJarno Rajahalme info->range.max_addr.ip)))) 144705752523SJarno Rajahalme return false; 144899b7248eSArnd Bergmann } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) && 144999b7248eSArnd Bergmann info->family == NFPROTO_IPV6) { 145005752523SJarno Rajahalme if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN, 145105752523SJarno Rajahalme &info->range.min_addr.in6) || 145205752523SJarno Rajahalme (memcmp(&info->range.max_addr.in6, 145305752523SJarno Rajahalme &info->range.min_addr.in6, 145405752523SJarno Rajahalme sizeof(info->range.max_addr.in6)) && 145505752523SJarno Rajahalme (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX, 145605752523SJarno Rajahalme &info->range.max_addr.in6)))) 145705752523SJarno Rajahalme return false; 145805752523SJarno Rajahalme } else { 145905752523SJarno Rajahalme return false; 146005752523SJarno Rajahalme } 146105752523SJarno Rajahalme } 146205752523SJarno Rajahalme if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED && 146305752523SJarno Rajahalme (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN, 146405752523SJarno Rajahalme ntohs(info->range.min_proto.all)) || 146505752523SJarno Rajahalme (info->range.max_proto.all != info->range.min_proto.all && 146605752523SJarno Rajahalme nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX, 146705752523SJarno Rajahalme ntohs(info->range.max_proto.all))))) 146805752523SJarno Rajahalme return false; 146905752523SJarno Rajahalme 147005752523SJarno Rajahalme if (info->range.flags & NF_NAT_RANGE_PERSISTENT && 147105752523SJarno Rajahalme nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT)) 147205752523SJarno Rajahalme return false; 147305752523SJarno Rajahalme if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM && 147405752523SJarno Rajahalme nla_put_flag(skb, OVS_NAT_ATTR_PROTO_HASH)) 147505752523SJarno Rajahalme return false; 147605752523SJarno Rajahalme if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY && 147705752523SJarno Rajahalme nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM)) 147805752523SJarno Rajahalme return false; 147905752523SJarno Rajahalme out: 148005752523SJarno Rajahalme nla_nest_end(skb, start); 148105752523SJarno Rajahalme 148205752523SJarno Rajahalme return true; 148305752523SJarno Rajahalme } 148405752523SJarno Rajahalme #endif 148505752523SJarno Rajahalme 14867f8a436eSJoe Stringer int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info, 14877f8a436eSJoe Stringer struct sk_buff *skb) 14887f8a436eSJoe Stringer { 14897f8a436eSJoe Stringer struct nlattr *start; 14907f8a436eSJoe Stringer 14917f8a436eSJoe Stringer start = nla_nest_start(skb, OVS_ACTION_ATTR_CT); 14927f8a436eSJoe Stringer if (!start) 14937f8a436eSJoe Stringer return -EMSGSIZE; 14947f8a436eSJoe Stringer 1495dd41d33fSJarno Rajahalme if (ct_info->commit && nla_put_flag(skb, ct_info->force 1496dd41d33fSJarno Rajahalme ? OVS_CT_ATTR_FORCE_COMMIT 1497dd41d33fSJarno Rajahalme : OVS_CT_ATTR_COMMIT)) 14987f8a436eSJoe Stringer return -EMSGSIZE; 14997f8a436eSJoe Stringer if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && 15007f8a436eSJoe Stringer nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id)) 15017f8a436eSJoe Stringer return -EMSGSIZE; 1502e754ec69SJoe Stringer if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask && 1503182e3042SJoe Stringer nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark), 1504182e3042SJoe Stringer &ct_info->mark)) 1505182e3042SJoe Stringer return -EMSGSIZE; 1506c2ac6673SJoe Stringer if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && 1507e754ec69SJoe Stringer labels_nonzero(&ct_info->labels.mask) && 150833db4125SJoe Stringer nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels), 150933db4125SJoe Stringer &ct_info->labels)) 1510c2ac6673SJoe Stringer return -EMSGSIZE; 1511cae3a262SJoe Stringer if (ct_info->helper) { 1512cae3a262SJoe Stringer if (nla_put_string(skb, OVS_CT_ATTR_HELPER, 1513cae3a262SJoe Stringer ct_info->helper->name)) 1514cae3a262SJoe Stringer return -EMSGSIZE; 1515cae3a262SJoe Stringer } 151605752523SJarno Rajahalme #ifdef CONFIG_NF_NAT_NEEDED 151705752523SJarno Rajahalme if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb)) 151805752523SJarno Rajahalme return -EMSGSIZE; 151905752523SJarno Rajahalme #endif 15207f8a436eSJoe Stringer nla_nest_end(skb, start); 15217f8a436eSJoe Stringer 15227f8a436eSJoe Stringer return 0; 15237f8a436eSJoe Stringer } 15247f8a436eSJoe Stringer 15257f8a436eSJoe Stringer void ovs_ct_free_action(const struct nlattr *a) 15267f8a436eSJoe Stringer { 15277f8a436eSJoe Stringer struct ovs_conntrack_info *ct_info = nla_data(a); 15287f8a436eSJoe Stringer 15292f3ab9f9SJoe Stringer __ovs_ct_free_action(ct_info); 15302f3ab9f9SJoe Stringer } 15312f3ab9f9SJoe Stringer 15322f3ab9f9SJoe Stringer static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info) 15332f3ab9f9SJoe Stringer { 1534cae3a262SJoe Stringer if (ct_info->helper) 1535cae3a262SJoe Stringer module_put(ct_info->helper->me); 15367f8a436eSJoe Stringer if (ct_info->ct) 153776644232SJoe Stringer nf_ct_tmpl_free(ct_info->ct); 15387f8a436eSJoe Stringer } 1539c2ac6673SJoe Stringer 1540c2ac6673SJoe Stringer void ovs_ct_init(struct net *net) 1541c2ac6673SJoe Stringer { 154233db4125SJoe Stringer unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE; 1543c2ac6673SJoe Stringer struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1544c2ac6673SJoe Stringer 1545adff6c65SFlorian Westphal if (nf_connlabels_get(net, n_bits - 1)) { 1546c2ac6673SJoe Stringer ovs_net->xt_label = false; 1547c2ac6673SJoe Stringer OVS_NLERR(true, "Failed to set connlabel length"); 1548c2ac6673SJoe Stringer } else { 1549c2ac6673SJoe Stringer ovs_net->xt_label = true; 1550c2ac6673SJoe Stringer } 1551c2ac6673SJoe Stringer } 1552c2ac6673SJoe Stringer 1553c2ac6673SJoe Stringer void ovs_ct_exit(struct net *net) 1554c2ac6673SJoe Stringer { 1555c2ac6673SJoe Stringer struct ovs_net *ovs_net = net_generic(net, ovs_net_id); 1556c2ac6673SJoe Stringer 1557c2ac6673SJoe Stringer if (ovs_net->xt_label) 1558c2ac6673SJoe Stringer nf_connlabels_put(net); 1559c2ac6673SJoe Stringer } 1560