Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015 Nicira, Inc. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of version 2 of the GNU General Public |
| 6 | * License as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/openvswitch.h> |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 16 | #include <linux/tcp.h> |
| 17 | #include <linux/udp.h> |
| 18 | #include <linux/sctp.h> |
Yi-Hung Wei | 11efd5c | 2018-05-24 17:56:43 -0700 | [diff] [blame^] | 19 | #include <linux/static_key.h> |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 20 | #include <net/ip.h> |
Yi-Hung Wei | 11efd5c | 2018-05-24 17:56:43 -0700 | [diff] [blame^] | 21 | #include <net/genetlink.h> |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 22 | #include <net/netfilter/nf_conntrack_core.h> |
Yi-Hung Wei | 11efd5c | 2018-05-24 17:56:43 -0700 | [diff] [blame^] | 23 | #include <net/netfilter/nf_conntrack_count.h> |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 24 | #include <net/netfilter/nf_conntrack_helper.h> |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 25 | #include <net/netfilter/nf_conntrack_labels.h> |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 26 | #include <net/netfilter/nf_conntrack_seqadj.h> |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 27 | #include <net/netfilter/nf_conntrack_zones.h> |
| 28 | #include <net/netfilter/ipv6/nf_defrag_ipv6.h> |
| 29 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 30 | #ifdef CONFIG_NF_NAT_NEEDED |
| 31 | #include <linux/netfilter/nf_nat.h> |
| 32 | #include <net/netfilter/nf_nat_core.h> |
| 33 | #include <net/netfilter/nf_nat_l3proto.h> |
| 34 | #endif |
| 35 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 36 | #include "datapath.h" |
| 37 | #include "conntrack.h" |
| 38 | #include "flow.h" |
| 39 | #include "flow_netlink.h" |
| 40 | |
| 41 | struct ovs_ct_len_tbl { |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 42 | int maxlen; |
| 43 | int minlen; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 44 | }; |
| 45 | |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 46 | /* Metadata mark for masked write to conntrack mark */ |
| 47 | struct md_mark { |
| 48 | u32 value; |
| 49 | u32 mask; |
| 50 | }; |
| 51 | |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 52 | /* Metadata label for masked write to conntrack label. */ |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 53 | struct md_labels { |
| 54 | struct ovs_key_ct_labels value; |
| 55 | struct ovs_key_ct_labels mask; |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 56 | }; |
| 57 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 58 | enum ovs_ct_nat { |
| 59 | OVS_CT_NAT = 1 << 0, /* NAT for committed connections only. */ |
| 60 | OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */ |
| 61 | OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */ |
| 62 | }; |
| 63 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 64 | /* Conntrack action context for execution. */ |
| 65 | struct ovs_conntrack_info { |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 66 | struct nf_conntrack_helper *helper; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 67 | struct nf_conntrack_zone zone; |
| 68 | struct nf_conn *ct; |
Joe Stringer | ab38a7b | 2015-10-06 11:00:01 -0700 | [diff] [blame] | 69 | u8 commit : 1; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 70 | u8 nat : 3; /* enum ovs_ct_nat */ |
Jarno Rajahalme | dd41d33 | 2017-02-09 11:22:00 -0800 | [diff] [blame] | 71 | u8 force : 1; |
Jarno Rajahalme | 1206455 | 2017-04-21 16:48:06 -0700 | [diff] [blame] | 72 | u8 have_eventmask : 1; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 73 | u16 family; |
Jarno Rajahalme | 1206455 | 2017-04-21 16:48:06 -0700 | [diff] [blame] | 74 | u32 eventmask; /* Mask of 1 << IPCT_*. */ |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 75 | struct md_mark mark; |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 76 | struct md_labels labels; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 77 | #ifdef CONFIG_NF_NAT_NEEDED |
Thierry Du Tre | 2eb0f62 | 2018-04-04 15:38:22 +0200 | [diff] [blame] | 78 | struct nf_nat_range2 range; /* Only present for SRC NAT and DST NAT. */ |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 79 | #endif |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 80 | }; |
| 81 | |
Yi-Hung Wei | 11efd5c | 2018-05-24 17:56:43 -0700 | [diff] [blame^] | 82 | #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) |
| 83 | #define OVS_CT_LIMIT_UNLIMITED 0 |
| 84 | #define OVS_CT_LIMIT_DEFAULT OVS_CT_LIMIT_UNLIMITED |
| 85 | #define CT_LIMIT_HASH_BUCKETS 512 |
| 86 | static DEFINE_STATIC_KEY_FALSE(ovs_ct_limit_enabled); |
| 87 | |
| 88 | struct ovs_ct_limit { |
| 89 | /* Elements in ovs_ct_limit_info->limits hash table */ |
| 90 | struct hlist_node hlist_node; |
| 91 | struct rcu_head rcu; |
| 92 | u16 zone; |
| 93 | u32 limit; |
| 94 | }; |
| 95 | |
| 96 | struct ovs_ct_limit_info { |
| 97 | u32 default_limit; |
| 98 | struct hlist_head *limits; |
| 99 | struct nf_conncount_data *data; |
| 100 | }; |
| 101 | |
| 102 | static const struct nla_policy ct_limit_policy[OVS_CT_LIMIT_ATTR_MAX + 1] = { |
| 103 | [OVS_CT_LIMIT_ATTR_ZONE_LIMIT] = { .type = NLA_NESTED, }, |
| 104 | }; |
| 105 | #endif |
| 106 | |
Jarno Rajahalme | 09aa98a | 2017-02-09 11:21:58 -0800 | [diff] [blame] | 107 | static bool labels_nonzero(const struct ovs_key_ct_labels *labels); |
| 108 | |
Joe Stringer | 2f3ab9f | 2015-12-09 14:07:39 -0800 | [diff] [blame] | 109 | static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info); |
| 110 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 111 | static u16 key_to_nfproto(const struct sw_flow_key *key) |
| 112 | { |
| 113 | switch (ntohs(key->eth.type)) { |
| 114 | case ETH_P_IP: |
| 115 | return NFPROTO_IPV4; |
| 116 | case ETH_P_IPV6: |
| 117 | return NFPROTO_IPV6; |
| 118 | default: |
| 119 | return NFPROTO_UNSPEC; |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | /* Map SKB connection state into the values used by flow definition. */ |
| 124 | static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo) |
| 125 | { |
| 126 | u8 ct_state = OVS_CS_F_TRACKED; |
| 127 | |
| 128 | switch (ctinfo) { |
| 129 | case IP_CT_ESTABLISHED_REPLY: |
| 130 | case IP_CT_RELATED_REPLY: |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 131 | ct_state |= OVS_CS_F_REPLY_DIR; |
| 132 | break; |
| 133 | default: |
| 134 | break; |
| 135 | } |
| 136 | |
| 137 | switch (ctinfo) { |
| 138 | case IP_CT_ESTABLISHED: |
| 139 | case IP_CT_ESTABLISHED_REPLY: |
| 140 | ct_state |= OVS_CS_F_ESTABLISHED; |
| 141 | break; |
| 142 | case IP_CT_RELATED: |
| 143 | case IP_CT_RELATED_REPLY: |
| 144 | ct_state |= OVS_CS_F_RELATED; |
| 145 | break; |
| 146 | case IP_CT_NEW: |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 147 | ct_state |= OVS_CS_F_NEW; |
| 148 | break; |
| 149 | default: |
| 150 | break; |
| 151 | } |
| 152 | |
| 153 | return ct_state; |
| 154 | } |
| 155 | |
Joe Stringer | 0d5cdef | 2015-08-28 19:22:11 -0700 | [diff] [blame] | 156 | static u32 ovs_ct_get_mark(const struct nf_conn *ct) |
| 157 | { |
| 158 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) |
| 159 | return ct ? ct->mark : 0; |
| 160 | #else |
| 161 | return 0; |
| 162 | #endif |
| 163 | } |
| 164 | |
Jarno Rajahalme | b87cec3 | 2017-02-09 11:21:56 -0800 | [diff] [blame] | 165 | /* Guard against conntrack labels max size shrinking below 128 bits. */ |
| 166 | #if NF_CT_LABELS_MAX_SIZE < 16 |
| 167 | #error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes |
| 168 | #endif |
| 169 | |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 170 | static void ovs_ct_get_labels(const struct nf_conn *ct, |
| 171 | struct ovs_key_ct_labels *labels) |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 172 | { |
| 173 | struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL; |
| 174 | |
Jarno Rajahalme | b87cec3 | 2017-02-09 11:21:56 -0800 | [diff] [blame] | 175 | if (cl) |
| 176 | memcpy(labels, cl->bits, OVS_CT_LABELS_LEN); |
| 177 | else |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 178 | memset(labels, 0, OVS_CT_LABELS_LEN); |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 179 | } |
| 180 | |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 181 | static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key, |
| 182 | const struct nf_conntrack_tuple *orig, |
| 183 | u8 icmp_proto) |
| 184 | { |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 185 | key->ct_orig_proto = orig->dst.protonum; |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 186 | if (orig->dst.protonum == icmp_proto) { |
| 187 | key->ct.orig_tp.src = htons(orig->dst.u.icmp.type); |
| 188 | key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code); |
| 189 | } else { |
| 190 | key->ct.orig_tp.src = orig->src.u.all; |
| 191 | key->ct.orig_tp.dst = orig->dst.u.all; |
| 192 | } |
| 193 | } |
| 194 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 195 | static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state, |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 196 | const struct nf_conntrack_zone *zone, |
| 197 | const struct nf_conn *ct) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 198 | { |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 199 | key->ct_state = state; |
| 200 | key->ct_zone = zone->id; |
Joe Stringer | 0d5cdef | 2015-08-28 19:22:11 -0700 | [diff] [blame] | 201 | key->ct.mark = ovs_ct_get_mark(ct); |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 202 | ovs_ct_get_labels(ct, &key->ct.labels); |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 203 | |
| 204 | if (ct) { |
| 205 | const struct nf_conntrack_tuple *orig; |
| 206 | |
| 207 | /* Use the master if we have one. */ |
| 208 | if (ct->master) |
| 209 | ct = ct->master; |
| 210 | orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; |
| 211 | |
| 212 | /* IP version must match with the master connection. */ |
| 213 | if (key->eth.type == htons(ETH_P_IP) && |
| 214 | nf_ct_l3num(ct) == NFPROTO_IPV4) { |
| 215 | key->ipv4.ct_orig.src = orig->src.u3.ip; |
| 216 | key->ipv4.ct_orig.dst = orig->dst.u3.ip; |
| 217 | __ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP); |
| 218 | return; |
| 219 | } else if (key->eth.type == htons(ETH_P_IPV6) && |
| 220 | !sw_flow_key_is_nd(key) && |
| 221 | nf_ct_l3num(ct) == NFPROTO_IPV6) { |
| 222 | key->ipv6.ct_orig.src = orig->src.u3.in6; |
| 223 | key->ipv6.ct_orig.dst = orig->dst.u3.in6; |
| 224 | __ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP); |
| 225 | return; |
| 226 | } |
| 227 | } |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 228 | /* Clear 'ct_orig_proto' to mark the non-existence of conntrack |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 229 | * original direction key fields. |
| 230 | */ |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 231 | key->ct_orig_proto = 0; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 232 | } |
| 233 | |
Jarno Rajahalme | 5e17da6 | 2017-02-09 11:21:52 -0800 | [diff] [blame] | 234 | /* Update 'key' based on skb->_nfct. If 'post_ct' is true, then OVS has |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 235 | * previously sent the packet to conntrack via the ct action. If |
| 236 | * 'keep_nat_flags' is true, the existing NAT flags retained, else they are |
| 237 | * initialized from the connection status. |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 238 | */ |
| 239 | static void ovs_ct_update_key(const struct sk_buff *skb, |
Joe Stringer | d110986 | 2015-12-09 14:07:40 -0800 | [diff] [blame] | 240 | const struct ovs_conntrack_info *info, |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 241 | struct sw_flow_key *key, bool post_ct, |
| 242 | bool keep_nat_flags) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 243 | { |
| 244 | const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt; |
| 245 | enum ip_conntrack_info ctinfo; |
| 246 | struct nf_conn *ct; |
| 247 | u8 state = 0; |
| 248 | |
| 249 | ct = nf_ct_get(skb, &ctinfo); |
| 250 | if (ct) { |
| 251 | state = ovs_ct_get_state(ctinfo); |
Jarno Rajahalme | 9f13ded | 2016-03-10 10:54:18 -0800 | [diff] [blame] | 252 | /* All unconfirmed entries are NEW connections. */ |
Joe Stringer | 4f0909e | 2015-10-19 19:18:59 -0700 | [diff] [blame] | 253 | if (!nf_ct_is_confirmed(ct)) |
| 254 | state |= OVS_CS_F_NEW; |
Jarno Rajahalme | 9f13ded | 2016-03-10 10:54:18 -0800 | [diff] [blame] | 255 | /* OVS persists the related flag for the duration of the |
| 256 | * connection. |
| 257 | */ |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 258 | if (ct->master) |
| 259 | state |= OVS_CS_F_RELATED; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 260 | if (keep_nat_flags) { |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 261 | state |= key->ct_state & OVS_CS_F_NAT_MASK; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 262 | } else { |
| 263 | if (ct->status & IPS_SRC_NAT) |
| 264 | state |= OVS_CS_F_SRC_NAT; |
| 265 | if (ct->status & IPS_DST_NAT) |
| 266 | state |= OVS_CS_F_DST_NAT; |
| 267 | } |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 268 | zone = nf_ct_zone(ct); |
| 269 | } else if (post_ct) { |
| 270 | state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID; |
Joe Stringer | d110986 | 2015-12-09 14:07:40 -0800 | [diff] [blame] | 271 | if (info) |
| 272 | zone = &info->zone; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 273 | } |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 274 | __ovs_ct_update_key(key, state, zone, ct); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 275 | } |
| 276 | |
Jarno Rajahalme | 9f13ded | 2016-03-10 10:54:18 -0800 | [diff] [blame] | 277 | /* This is called to initialize CT key fields possibly coming in from the local |
| 278 | * stack. |
| 279 | */ |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 280 | void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key) |
| 281 | { |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 282 | ovs_ct_update_key(skb, NULL, key, false, false); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 283 | } |
| 284 | |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 285 | #define IN6_ADDR_INITIALIZER(ADDR) \ |
| 286 | { (ADDR).s6_addr32[0], (ADDR).s6_addr32[1], \ |
| 287 | (ADDR).s6_addr32[2], (ADDR).s6_addr32[3] } |
| 288 | |
| 289 | int ovs_ct_put_key(const struct sw_flow_key *swkey, |
| 290 | const struct sw_flow_key *output, struct sk_buff *skb) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 291 | { |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 292 | if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state)) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 293 | return -EMSGSIZE; |
| 294 | |
| 295 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 296 | nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone)) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 297 | return -EMSGSIZE; |
| 298 | |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 299 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 300 | nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark)) |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 301 | return -EMSGSIZE; |
| 302 | |
Valentin Rothberg | 9723e6a | 2015-08-28 10:39:56 +0200 | [diff] [blame] | 303 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 304 | nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels), |
| 305 | &output->ct.labels)) |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 306 | return -EMSGSIZE; |
| 307 | |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 308 | if (swkey->ct_orig_proto) { |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 309 | if (swkey->eth.type == htons(ETH_P_IP)) { |
| 310 | struct ovs_key_ct_tuple_ipv4 orig = { |
| 311 | output->ipv4.ct_orig.src, |
| 312 | output->ipv4.ct_orig.dst, |
| 313 | output->ct.orig_tp.src, |
| 314 | output->ct.orig_tp.dst, |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 315 | output->ct_orig_proto, |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 316 | }; |
| 317 | if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4, |
| 318 | sizeof(orig), &orig)) |
| 319 | return -EMSGSIZE; |
| 320 | } else if (swkey->eth.type == htons(ETH_P_IPV6)) { |
| 321 | struct ovs_key_ct_tuple_ipv6 orig = { |
| 322 | IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.src), |
| 323 | IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.dst), |
| 324 | output->ct.orig_tp.src, |
| 325 | output->ct.orig_tp.dst, |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 326 | output->ct_orig_proto, |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 327 | }; |
| 328 | if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6, |
| 329 | sizeof(orig), &orig)) |
| 330 | return -EMSGSIZE; |
| 331 | } |
| 332 | } |
| 333 | |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 334 | return 0; |
| 335 | } |
| 336 | |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 337 | static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key, |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 338 | u32 ct_mark, u32 mask) |
| 339 | { |
Joe Stringer | 0d5cdef | 2015-08-28 19:22:11 -0700 | [diff] [blame] | 340 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 341 | u32 new_mark; |
| 342 | |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 343 | new_mark = ct_mark | (ct->mark & ~(mask)); |
| 344 | if (ct->mark != new_mark) { |
| 345 | ct->mark = new_mark; |
Jarno Rajahalme | 193e309 | 2017-02-09 11:21:54 -0800 | [diff] [blame] | 346 | if (nf_ct_is_confirmed(ct)) |
| 347 | nf_conntrack_event_cache(IPCT_MARK, ct); |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 348 | key->ct.mark = new_mark; |
| 349 | } |
| 350 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 351 | return 0; |
Joe Stringer | 0d5cdef | 2015-08-28 19:22:11 -0700 | [diff] [blame] | 352 | #else |
| 353 | return -ENOTSUPP; |
| 354 | #endif |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 355 | } |
| 356 | |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 357 | static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct) |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 358 | { |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 359 | struct nf_conn_labels *cl; |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 360 | |
| 361 | cl = nf_ct_labels_find(ct); |
| 362 | if (!cl) { |
| 363 | nf_ct_labels_ext_add(ct); |
| 364 | cl = nf_ct_labels_find(ct); |
| 365 | } |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 366 | |
| 367 | return cl; |
| 368 | } |
| 369 | |
| 370 | /* Initialize labels for a new, yet to be committed conntrack entry. Note that |
| 371 | * since the new connection is not yet confirmed, and thus no-one else has |
Jarno Rajahalme | 2317c6b | 2017-02-17 18:11:58 -0800 | [diff] [blame] | 372 | * access to it's labels, we simply write them over. |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 373 | */ |
| 374 | static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key, |
| 375 | const struct ovs_key_ct_labels *labels, |
| 376 | const struct ovs_key_ct_labels *mask) |
| 377 | { |
Jarno Rajahalme | 09aa98a | 2017-02-09 11:21:58 -0800 | [diff] [blame] | 378 | struct nf_conn_labels *cl, *master_cl; |
| 379 | bool have_mask = labels_nonzero(mask); |
| 380 | |
| 381 | /* Inherit master's labels to the related connection? */ |
| 382 | master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL; |
| 383 | |
| 384 | if (!master_cl && !have_mask) |
| 385 | return 0; /* Nothing to do. */ |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 386 | |
| 387 | cl = ovs_ct_get_conn_labels(ct); |
Jarno Rajahalme | b87cec3 | 2017-02-09 11:21:56 -0800 | [diff] [blame] | 388 | if (!cl) |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 389 | return -ENOSPC; |
| 390 | |
Jarno Rajahalme | 09aa98a | 2017-02-09 11:21:58 -0800 | [diff] [blame] | 391 | /* Inherit the master's labels, if any. */ |
| 392 | if (master_cl) |
| 393 | *cl = *master_cl; |
| 394 | |
| 395 | if (have_mask) { |
| 396 | u32 *dst = (u32 *)cl->bits; |
| 397 | int i; |
| 398 | |
| 399 | for (i = 0; i < OVS_CT_LABELS_LEN_32; i++) |
| 400 | dst[i] = (dst[i] & ~mask->ct_labels_32[i]) | |
| 401 | (labels->ct_labels_32[i] |
| 402 | & mask->ct_labels_32[i]); |
| 403 | } |
Jarno Rajahalme | 193e309 | 2017-02-09 11:21:54 -0800 | [diff] [blame] | 404 | |
Jarno Rajahalme | 2317c6b | 2017-02-17 18:11:58 -0800 | [diff] [blame] | 405 | /* Labels are included in the IPCTNL_MSG_CT_NEW event only if the |
Jarno Rajahalme | abd0a4f | 2017-04-21 16:48:05 -0700 | [diff] [blame] | 406 | * IPCT_LABEL bit is set in the event cache. |
Jarno Rajahalme | 2317c6b | 2017-02-17 18:11:58 -0800 | [diff] [blame] | 407 | */ |
| 408 | nf_conntrack_event_cache(IPCT_LABEL, ct); |
| 409 | |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 410 | memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 411 | |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key, |
| 416 | const struct ovs_key_ct_labels *labels, |
| 417 | const struct ovs_key_ct_labels *mask) |
| 418 | { |
| 419 | struct nf_conn_labels *cl; |
| 420 | int err; |
| 421 | |
| 422 | cl = ovs_ct_get_conn_labels(ct); |
| 423 | if (!cl) |
| 424 | return -ENOSPC; |
| 425 | |
| 426 | err = nf_connlabels_replace(ct, labels->ct_labels_32, |
| 427 | mask->ct_labels_32, |
| 428 | OVS_CT_LABELS_LEN_32); |
| 429 | if (err) |
| 430 | return err; |
| 431 | |
| 432 | memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); |
| 433 | |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 434 | return 0; |
| 435 | } |
| 436 | |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 437 | /* 'skb' should already be pulled to nh_ofs. */ |
| 438 | static int ovs_ct_helper(struct sk_buff *skb, u16 proto) |
| 439 | { |
| 440 | const struct nf_conntrack_helper *helper; |
| 441 | const struct nf_conn_help *help; |
| 442 | enum ip_conntrack_info ctinfo; |
| 443 | unsigned int protoff; |
| 444 | struct nf_conn *ct; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 445 | int err; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 446 | |
| 447 | ct = nf_ct_get(skb, &ctinfo); |
| 448 | if (!ct || ctinfo == IP_CT_RELATED_REPLY) |
| 449 | return NF_ACCEPT; |
| 450 | |
| 451 | help = nfct_help(ct); |
| 452 | if (!help) |
| 453 | return NF_ACCEPT; |
| 454 | |
| 455 | helper = rcu_dereference(help->helper); |
| 456 | if (!helper) |
| 457 | return NF_ACCEPT; |
| 458 | |
| 459 | switch (proto) { |
| 460 | case NFPROTO_IPV4: |
| 461 | protoff = ip_hdrlen(skb); |
| 462 | break; |
| 463 | case NFPROTO_IPV6: { |
| 464 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
| 465 | __be16 frag_off; |
Joe Stringer | cc57060 | 2015-09-14 11:14:50 -0700 | [diff] [blame] | 466 | int ofs; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 467 | |
Joe Stringer | cc57060 | 2015-09-14 11:14:50 -0700 | [diff] [blame] | 468 | ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, |
| 469 | &frag_off); |
| 470 | if (ofs < 0 || (frag_off & htons(~0x7)) != 0) { |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 471 | pr_debug("proto header not found\n"); |
| 472 | return NF_ACCEPT; |
| 473 | } |
Joe Stringer | cc57060 | 2015-09-14 11:14:50 -0700 | [diff] [blame] | 474 | protoff = ofs; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 475 | break; |
| 476 | } |
| 477 | default: |
| 478 | WARN_ONCE(1, "helper invoked on non-IP family!"); |
| 479 | return NF_DROP; |
| 480 | } |
| 481 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 482 | err = helper->help(skb, protoff, ct, ctinfo); |
| 483 | if (err != NF_ACCEPT) |
| 484 | return err; |
| 485 | |
| 486 | /* Adjust seqs after helper. This is needed due to some helpers (e.g., |
| 487 | * FTP with NAT) adusting the TCP payload size when mangling IP |
| 488 | * addresses and/or port numbers in the text-based control connection. |
| 489 | */ |
| 490 | if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && |
| 491 | !nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) |
| 492 | return NF_DROP; |
| 493 | return NF_ACCEPT; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 494 | } |
| 495 | |
Joe Stringer | 74c1661 | 2015-10-25 20:21:48 -0700 | [diff] [blame] | 496 | /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero |
| 497 | * value if 'skb' is freed. |
| 498 | */ |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 499 | static int handle_fragments(struct net *net, struct sw_flow_key *key, |
| 500 | u16 zone, struct sk_buff *skb) |
| 501 | { |
| 502 | struct ovs_skb_cb ovs_cb = *OVS_CB(skb); |
Florian Westphal | daaa7d6 | 2015-11-18 23:32:40 +0100 | [diff] [blame] | 503 | int err; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 504 | |
| 505 | if (key->eth.type == htons(ETH_P_IP)) { |
| 506 | enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 507 | |
| 508 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
Eric W. Biederman | 19bcf9f | 2015-10-09 13:44:54 -0500 | [diff] [blame] | 509 | err = ip_defrag(net, skb, user); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 510 | if (err) |
| 511 | return err; |
| 512 | |
| 513 | ovs_cb.mru = IPCB(skb)->frag_max_size; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 514 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
Joe Stringer | 74c1661 | 2015-10-25 20:21:48 -0700 | [diff] [blame] | 515 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 516 | enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 517 | |
| 518 | memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); |
Florian Westphal | daaa7d6 | 2015-11-18 23:32:40 +0100 | [diff] [blame] | 519 | err = nf_ct_frag6_gather(net, skb, user); |
Daniele Di Proietto | f92a80a | 2016-11-28 15:43:53 -0800 | [diff] [blame] | 520 | if (err) { |
| 521 | if (err != -EINPROGRESS) |
| 522 | kfree_skb(skb); |
Florian Westphal | daaa7d6 | 2015-11-18 23:32:40 +0100 | [diff] [blame] | 523 | return err; |
Daniele Di Proietto | f92a80a | 2016-11-28 15:43:53 -0800 | [diff] [blame] | 524 | } |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 525 | |
Florian Westphal | daaa7d6 | 2015-11-18 23:32:40 +0100 | [diff] [blame] | 526 | key->ip.proto = ipv6_hdr(skb)->nexthdr; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 527 | ovs_cb.mru = IP6CB(skb)->frag_max_size; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 528 | #endif |
| 529 | } else { |
Joe Stringer | 74c1661 | 2015-10-25 20:21:48 -0700 | [diff] [blame] | 530 | kfree_skb(skb); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 531 | return -EPFNOSUPPORT; |
| 532 | } |
| 533 | |
| 534 | key->ip.frag = OVS_FRAG_TYPE_NONE; |
| 535 | skb_clear_hash(skb); |
| 536 | skb->ignore_df = 1; |
| 537 | *OVS_CB(skb) = ovs_cb; |
| 538 | |
| 539 | return 0; |
| 540 | } |
| 541 | |
| 542 | static struct nf_conntrack_expect * |
| 543 | ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone, |
| 544 | u16 proto, const struct sk_buff *skb) |
| 545 | { |
| 546 | struct nf_conntrack_tuple tuple; |
Jarno Rajahalme | cf5d709 | 2017-04-14 14:26:38 -0700 | [diff] [blame] | 547 | struct nf_conntrack_expect *exp; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 548 | |
Eric W. Biederman | a31f1ad | 2015-09-18 14:33:04 -0500 | [diff] [blame] | 549 | if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple)) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 550 | return NULL; |
Jarno Rajahalme | cf5d709 | 2017-04-14 14:26:38 -0700 | [diff] [blame] | 551 | |
| 552 | exp = __nf_ct_expect_find(net, zone, &tuple); |
| 553 | if (exp) { |
| 554 | struct nf_conntrack_tuple_hash *h; |
| 555 | |
| 556 | /* Delete existing conntrack entry, if it clashes with the |
| 557 | * expectation. This can happen since conntrack ALGs do not |
| 558 | * check for clashes between (new) expectations and existing |
| 559 | * conntrack entries. nf_conntrack_in() will check the |
| 560 | * expectations only if a conntrack entry can not be found, |
| 561 | * which can lead to OVS finding the expectation (here) in the |
| 562 | * init direction, but which will not be removed by the |
| 563 | * nf_conntrack_in() call, if a matching conntrack entry is |
| 564 | * found instead. In this case all init direction packets |
| 565 | * would be reported as new related packets, while reply |
| 566 | * direction packets would be reported as un-related |
| 567 | * established packets. |
| 568 | */ |
| 569 | h = nf_conntrack_find_get(net, zone, &tuple); |
| 570 | if (h) { |
| 571 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); |
| 572 | |
| 573 | nf_ct_delete(ct, 0, 0); |
| 574 | nf_conntrack_put(&ct->ct_general); |
| 575 | } |
| 576 | } |
| 577 | |
| 578 | return exp; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 579 | } |
| 580 | |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 581 | /* This replicates logic from nf_conntrack_core.c that is not exported. */ |
| 582 | static enum ip_conntrack_info |
| 583 | ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h) |
| 584 | { |
| 585 | const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); |
| 586 | |
| 587 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) |
| 588 | return IP_CT_ESTABLISHED_REPLY; |
| 589 | /* Once we've had two way comms, always ESTABLISHED. */ |
| 590 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) |
| 591 | return IP_CT_ESTABLISHED; |
| 592 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) |
| 593 | return IP_CT_RELATED; |
| 594 | return IP_CT_NEW; |
| 595 | } |
| 596 | |
| 597 | /* Find an existing connection which this packet belongs to without |
| 598 | * re-attributing statistics or modifying the connection state. This allows an |
Jarno Rajahalme | 5e17da6 | 2017-02-09 11:21:52 -0800 | [diff] [blame] | 599 | * skb->_nfct lost due to an upcall to be recovered during actions execution. |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 600 | * |
| 601 | * Must be called with rcu_read_lock. |
| 602 | * |
Jarno Rajahalme | 5e17da6 | 2017-02-09 11:21:52 -0800 | [diff] [blame] | 603 | * On success, populates skb->_nfct and returns the connection. Returns NULL |
| 604 | * if there is no existing entry. |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 605 | */ |
| 606 | static struct nf_conn * |
| 607 | ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone, |
Jarno Rajahalme | 9ff464d | 2017-02-09 11:21:53 -0800 | [diff] [blame] | 608 | u8 l3num, struct sk_buff *skb, bool natted) |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 609 | { |
Florian Westphal | b3480fe | 2017-08-12 00:57:08 +0200 | [diff] [blame] | 610 | const struct nf_conntrack_l3proto *l3proto; |
| 611 | const struct nf_conntrack_l4proto *l4proto; |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 612 | struct nf_conntrack_tuple tuple; |
| 613 | struct nf_conntrack_tuple_hash *h; |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 614 | struct nf_conn *ct; |
| 615 | unsigned int dataoff; |
| 616 | u8 protonum; |
| 617 | |
| 618 | l3proto = __nf_ct_l3proto_find(l3num); |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 619 | if (l3proto->get_l4proto(skb, skb_network_offset(skb), &dataoff, |
| 620 | &protonum) <= 0) { |
| 621 | pr_debug("ovs_ct_find_existing: Can't get protonum\n"); |
| 622 | return NULL; |
| 623 | } |
| 624 | l4proto = __nf_ct_l4proto_find(l3num, protonum); |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 625 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), dataoff, l3num, |
| 626 | protonum, net, &tuple, l3proto, l4proto)) { |
| 627 | pr_debug("ovs_ct_find_existing: Can't get tuple\n"); |
| 628 | return NULL; |
| 629 | } |
| 630 | |
Jarno Rajahalme | 9ff464d | 2017-02-09 11:21:53 -0800 | [diff] [blame] | 631 | /* Must invert the tuple if skb has been transformed by NAT. */ |
| 632 | if (natted) { |
| 633 | struct nf_conntrack_tuple inverse; |
| 634 | |
| 635 | if (!nf_ct_invert_tuple(&inverse, &tuple, l3proto, l4proto)) { |
| 636 | pr_debug("ovs_ct_find_existing: Inversion failed!\n"); |
| 637 | return NULL; |
| 638 | } |
| 639 | tuple = inverse; |
| 640 | } |
| 641 | |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 642 | /* look for tuple match */ |
| 643 | h = nf_conntrack_find_get(net, zone, &tuple); |
| 644 | if (!h) |
| 645 | return NULL; /* Not found. */ |
| 646 | |
| 647 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 648 | |
Jarno Rajahalme | 9ff464d | 2017-02-09 11:21:53 -0800 | [diff] [blame] | 649 | /* Inverted packet tuple matches the reverse direction conntrack tuple, |
| 650 | * select the other tuplehash to get the right 'ctinfo' bits for this |
| 651 | * packet. |
| 652 | */ |
| 653 | if (natted) |
| 654 | h = &ct->tuplehash[!h->tuple.dst.dir]; |
| 655 | |
Florian Westphal | c74454f | 2017-01-23 18:21:57 +0100 | [diff] [blame] | 656 | nf_ct_set(skb, ct, ovs_ct_get_info(h)); |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 657 | return ct; |
| 658 | } |
| 659 | |
Greg Rose | 8b97ac5 | 2017-07-14 12:42:49 -0700 | [diff] [blame] | 660 | static |
| 661 | struct nf_conn *ovs_ct_executed(struct net *net, |
| 662 | const struct sw_flow_key *key, |
| 663 | const struct ovs_conntrack_info *info, |
| 664 | struct sk_buff *skb, |
| 665 | bool *ct_executed) |
| 666 | { |
| 667 | struct nf_conn *ct = NULL; |
| 668 | |
| 669 | /* If no ct, check if we have evidence that an existing conntrack entry |
| 670 | * might be found for this skb. This happens when we lose a skb->_nfct |
| 671 | * due to an upcall, or if the direction is being forced. If the |
| 672 | * connection was not confirmed, it is not cached and needs to be run |
| 673 | * through conntrack again. |
| 674 | */ |
| 675 | *ct_executed = (key->ct_state & OVS_CS_F_TRACKED) && |
| 676 | !(key->ct_state & OVS_CS_F_INVALID) && |
| 677 | (key->ct_zone == info->zone.id); |
| 678 | |
| 679 | if (*ct_executed || (!key->ct_state && info->force)) { |
| 680 | ct = ovs_ct_find_existing(net, &info->zone, info->family, skb, |
| 681 | !!(key->ct_state & |
| 682 | OVS_CS_F_NAT_MASK)); |
| 683 | } |
| 684 | |
| 685 | return ct; |
| 686 | } |
| 687 | |
Jarno Rajahalme | 5e17da6 | 2017-02-09 11:21:52 -0800 | [diff] [blame] | 688 | /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */ |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 689 | static bool skb_nfct_cached(struct net *net, |
| 690 | const struct sw_flow_key *key, |
| 691 | const struct ovs_conntrack_info *info, |
| 692 | struct sk_buff *skb) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 693 | { |
| 694 | enum ip_conntrack_info ctinfo; |
| 695 | struct nf_conn *ct; |
Greg Rose | 8b97ac5 | 2017-07-14 12:42:49 -0700 | [diff] [blame] | 696 | bool ct_executed = true; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 697 | |
| 698 | ct = nf_ct_get(skb, &ctinfo); |
| 699 | if (!ct) |
Greg Rose | 8b97ac5 | 2017-07-14 12:42:49 -0700 | [diff] [blame] | 700 | ct = ovs_ct_executed(net, key, info, skb, &ct_executed); |
| 701 | |
| 702 | if (ct) |
| 703 | nf_ct_get(skb, &ctinfo); |
| 704 | else |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 705 | return false; |
Greg Rose | 8b97ac5 | 2017-07-14 12:42:49 -0700 | [diff] [blame] | 706 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 707 | if (!net_eq(net, read_pnet(&ct->ct_net))) |
| 708 | return false; |
| 709 | if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct))) |
| 710 | return false; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 711 | if (info->helper) { |
| 712 | struct nf_conn_help *help; |
| 713 | |
| 714 | help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER); |
| 715 | if (help && rcu_access_pointer(help->helper) != info->helper) |
| 716 | return false; |
| 717 | } |
Jarno Rajahalme | dd41d33 | 2017-02-09 11:22:00 -0800 | [diff] [blame] | 718 | /* Force conntrack entry direction to the current packet? */ |
| 719 | if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) { |
| 720 | /* Delete the conntrack entry if confirmed, else just release |
| 721 | * the reference. |
| 722 | */ |
| 723 | if (nf_ct_is_confirmed(ct)) |
| 724 | nf_ct_delete(ct, 0, 0); |
Jarno Rajahalme | b768b16 | 2017-03-28 11:25:26 -0700 | [diff] [blame] | 725 | |
| 726 | nf_conntrack_put(&ct->ct_general); |
Jarno Rajahalme | dd41d33 | 2017-02-09 11:22:00 -0800 | [diff] [blame] | 727 | nf_ct_set(skb, NULL, 0); |
| 728 | return false; |
| 729 | } |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 730 | |
Greg Rose | 8b97ac5 | 2017-07-14 12:42:49 -0700 | [diff] [blame] | 731 | return ct_executed; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 732 | } |
| 733 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 734 | #ifdef CONFIG_NF_NAT_NEEDED |
| 735 | /* Modelled after nf_nat_ipv[46]_fn(). |
| 736 | * range is only used for new, uninitialized NAT state. |
| 737 | * Returns either NF_ACCEPT or NF_DROP. |
| 738 | */ |
| 739 | static int ovs_ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct, |
| 740 | enum ip_conntrack_info ctinfo, |
Thierry Du Tre | 2eb0f62 | 2018-04-04 15:38:22 +0200 | [diff] [blame] | 741 | const struct nf_nat_range2 *range, |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 742 | enum nf_nat_manip_type maniptype) |
| 743 | { |
| 744 | int hooknum, nh_off, err = NF_ACCEPT; |
| 745 | |
| 746 | nh_off = skb_network_offset(skb); |
Lance Richardson | 75f01a4 | 2017-01-12 19:33:18 -0500 | [diff] [blame] | 747 | skb_pull_rcsum(skb, nh_off); |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 748 | |
| 749 | /* See HOOK2MANIP(). */ |
| 750 | if (maniptype == NF_NAT_MANIP_SRC) |
| 751 | hooknum = NF_INET_LOCAL_IN; /* Source NAT */ |
| 752 | else |
| 753 | hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */ |
| 754 | |
| 755 | switch (ctinfo) { |
| 756 | case IP_CT_RELATED: |
| 757 | case IP_CT_RELATED_REPLY: |
Arnd Bergmann | 99b7248 | 2016-03-18 14:33:45 +0100 | [diff] [blame] | 758 | if (IS_ENABLED(CONFIG_NF_NAT_IPV4) && |
| 759 | skb->protocol == htons(ETH_P_IP) && |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 760 | ip_hdr(skb)->protocol == IPPROTO_ICMP) { |
| 761 | if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo, |
| 762 | hooknum)) |
| 763 | err = NF_DROP; |
| 764 | goto push; |
Arnd Bergmann | 99b7248 | 2016-03-18 14:33:45 +0100 | [diff] [blame] | 765 | } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) && |
| 766 | skb->protocol == htons(ETH_P_IPV6)) { |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 767 | __be16 frag_off; |
| 768 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
| 769 | int hdrlen = ipv6_skip_exthdr(skb, |
| 770 | sizeof(struct ipv6hdr), |
| 771 | &nexthdr, &frag_off); |
| 772 | |
| 773 | if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) { |
| 774 | if (!nf_nat_icmpv6_reply_translation(skb, ct, |
| 775 | ctinfo, |
| 776 | hooknum, |
| 777 | hdrlen)) |
| 778 | err = NF_DROP; |
| 779 | goto push; |
| 780 | } |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 781 | } |
| 782 | /* Non-ICMP, fall thru to initialize if needed. */ |
Gustavo A. R. Silva | 279badc | 2017-10-19 12:55:03 -0500 | [diff] [blame] | 783 | /* fall through */ |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 784 | case IP_CT_NEW: |
| 785 | /* Seen it before? This can happen for loopback, retrans, |
| 786 | * or local packets. |
| 787 | */ |
| 788 | if (!nf_nat_initialized(ct, maniptype)) { |
| 789 | /* Initialize according to the NAT action. */ |
| 790 | err = (range && range->flags & NF_NAT_RANGE_MAP_IPS) |
| 791 | /* Action is set up to establish a new |
| 792 | * mapping. |
| 793 | */ |
| 794 | ? nf_nat_setup_info(ct, range, maniptype) |
| 795 | : nf_nat_alloc_null_binding(ct, hooknum); |
| 796 | if (err != NF_ACCEPT) |
| 797 | goto push; |
| 798 | } |
| 799 | break; |
| 800 | |
| 801 | case IP_CT_ESTABLISHED: |
| 802 | case IP_CT_ESTABLISHED_REPLY: |
| 803 | break; |
| 804 | |
| 805 | default: |
| 806 | err = NF_DROP; |
| 807 | goto push; |
| 808 | } |
| 809 | |
| 810 | err = nf_nat_packet(ct, ctinfo, hooknum, skb); |
| 811 | push: |
| 812 | skb_push(skb, nh_off); |
Lance Richardson | 75f01a4 | 2017-01-12 19:33:18 -0500 | [diff] [blame] | 813 | skb_postpush_rcsum(skb, skb->data, nh_off); |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 814 | |
| 815 | return err; |
| 816 | } |
| 817 | |
| 818 | static void ovs_nat_update_key(struct sw_flow_key *key, |
| 819 | const struct sk_buff *skb, |
| 820 | enum nf_nat_manip_type maniptype) |
| 821 | { |
| 822 | if (maniptype == NF_NAT_MANIP_SRC) { |
| 823 | __be16 src; |
| 824 | |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 825 | key->ct_state |= OVS_CS_F_SRC_NAT; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 826 | if (key->eth.type == htons(ETH_P_IP)) |
| 827 | key->ipv4.addr.src = ip_hdr(skb)->saddr; |
| 828 | else if (key->eth.type == htons(ETH_P_IPV6)) |
| 829 | memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr, |
| 830 | sizeof(key->ipv6.addr.src)); |
| 831 | else |
| 832 | return; |
| 833 | |
| 834 | if (key->ip.proto == IPPROTO_UDP) |
| 835 | src = udp_hdr(skb)->source; |
| 836 | else if (key->ip.proto == IPPROTO_TCP) |
| 837 | src = tcp_hdr(skb)->source; |
| 838 | else if (key->ip.proto == IPPROTO_SCTP) |
| 839 | src = sctp_hdr(skb)->source; |
| 840 | else |
| 841 | return; |
| 842 | |
| 843 | key->tp.src = src; |
| 844 | } else { |
| 845 | __be16 dst; |
| 846 | |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 847 | key->ct_state |= OVS_CS_F_DST_NAT; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 848 | if (key->eth.type == htons(ETH_P_IP)) |
| 849 | key->ipv4.addr.dst = ip_hdr(skb)->daddr; |
| 850 | else if (key->eth.type == htons(ETH_P_IPV6)) |
| 851 | memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr, |
| 852 | sizeof(key->ipv6.addr.dst)); |
| 853 | else |
| 854 | return; |
| 855 | |
| 856 | if (key->ip.proto == IPPROTO_UDP) |
| 857 | dst = udp_hdr(skb)->dest; |
| 858 | else if (key->ip.proto == IPPROTO_TCP) |
| 859 | dst = tcp_hdr(skb)->dest; |
| 860 | else if (key->ip.proto == IPPROTO_SCTP) |
| 861 | dst = sctp_hdr(skb)->dest; |
| 862 | else |
| 863 | return; |
| 864 | |
| 865 | key->tp.dst = dst; |
| 866 | } |
| 867 | } |
| 868 | |
| 869 | /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */ |
| 870 | static int ovs_ct_nat(struct net *net, struct sw_flow_key *key, |
| 871 | const struct ovs_conntrack_info *info, |
| 872 | struct sk_buff *skb, struct nf_conn *ct, |
| 873 | enum ip_conntrack_info ctinfo) |
| 874 | { |
| 875 | enum nf_nat_manip_type maniptype; |
| 876 | int err; |
| 877 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 878 | /* Add NAT extension if not confirmed yet. */ |
| 879 | if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct)) |
| 880 | return NF_ACCEPT; /* Can't NAT. */ |
| 881 | |
| 882 | /* Determine NAT type. |
| 883 | * Check if the NAT type can be deduced from the tracked connection. |
Jarno Rajahalme | 5745b0b | 2016-03-21 11:15:19 -0700 | [diff] [blame] | 884 | * Make sure new expected connections (IP_CT_RELATED) are NATted only |
| 885 | * when committing. |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 886 | */ |
| 887 | if (info->nat & OVS_CT_NAT && ctinfo != IP_CT_NEW && |
| 888 | ct->status & IPS_NAT_MASK && |
Jarno Rajahalme | 5745b0b | 2016-03-21 11:15:19 -0700 | [diff] [blame] | 889 | (ctinfo != IP_CT_RELATED || info->commit)) { |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 890 | /* NAT an established or related connection like before. */ |
| 891 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) |
| 892 | /* This is the REPLY direction for a connection |
| 893 | * for which NAT was applied in the forward |
| 894 | * direction. Do the reverse NAT. |
| 895 | */ |
| 896 | maniptype = ct->status & IPS_SRC_NAT |
| 897 | ? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC; |
| 898 | else |
| 899 | maniptype = ct->status & IPS_SRC_NAT |
| 900 | ? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST; |
| 901 | } else if (info->nat & OVS_CT_SRC_NAT) { |
| 902 | maniptype = NF_NAT_MANIP_SRC; |
| 903 | } else if (info->nat & OVS_CT_DST_NAT) { |
| 904 | maniptype = NF_NAT_MANIP_DST; |
| 905 | } else { |
| 906 | return NF_ACCEPT; /* Connection is not NATed. */ |
| 907 | } |
| 908 | err = ovs_ct_nat_execute(skb, ct, ctinfo, &info->range, maniptype); |
| 909 | |
| 910 | /* Mark NAT done if successful and update the flow key. */ |
| 911 | if (err == NF_ACCEPT) |
| 912 | ovs_nat_update_key(key, skb, maniptype); |
| 913 | |
| 914 | return err; |
| 915 | } |
| 916 | #else /* !CONFIG_NF_NAT_NEEDED */ |
| 917 | static int ovs_ct_nat(struct net *net, struct sw_flow_key *key, |
| 918 | const struct ovs_conntrack_info *info, |
| 919 | struct sk_buff *skb, struct nf_conn *ct, |
| 920 | enum ip_conntrack_info ctinfo) |
| 921 | { |
| 922 | return NF_ACCEPT; |
| 923 | } |
| 924 | #endif |
| 925 | |
Jarno Rajahalme | 9f13ded | 2016-03-10 10:54:18 -0800 | [diff] [blame] | 926 | /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if |
Jarno Rajahalme | 394e910 | 2016-03-10 10:54:19 -0800 | [diff] [blame] | 927 | * not done already. Update key with new CT state after passing the packet |
| 928 | * through conntrack. |
Jarno Rajahalme | 5e17da6 | 2017-02-09 11:21:52 -0800 | [diff] [blame] | 929 | * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be |
Jarno Rajahalme | 9f13ded | 2016-03-10 10:54:18 -0800 | [diff] [blame] | 930 | * set to NULL and 0 will be returned. |
| 931 | */ |
Joe Stringer | 4f0909e | 2015-10-19 19:18:59 -0700 | [diff] [blame] | 932 | static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key, |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 933 | const struct ovs_conntrack_info *info, |
| 934 | struct sk_buff *skb) |
| 935 | { |
| 936 | /* If we are recirculating packets to match on conntrack fields and |
| 937 | * committing with a separate conntrack action, then we don't need to |
| 938 | * actually run the packet through conntrack twice unless it's for a |
| 939 | * different zone. |
| 940 | */ |
Jarno Rajahalme | 28b6e0c | 2016-03-10 10:54:22 -0800 | [diff] [blame] | 941 | bool cached = skb_nfct_cached(net, key, info, skb); |
| 942 | enum ip_conntrack_info ctinfo; |
| 943 | struct nf_conn *ct; |
| 944 | |
| 945 | if (!cached) { |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 946 | struct nf_conn *tmpl = info->ct; |
Jarno Rajahalme | 5b6b929 | 2016-03-10 10:54:21 -0800 | [diff] [blame] | 947 | int err; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 948 | |
| 949 | /* Associate skb with specified zone. */ |
| 950 | if (tmpl) { |
Florian Westphal | cb9c683 | 2017-01-23 18:21:56 +0100 | [diff] [blame] | 951 | if (skb_nfct(skb)) |
| 952 | nf_conntrack_put(skb_nfct(skb)); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 953 | nf_conntrack_get(&tmpl->ct_general); |
Florian Westphal | c74454f | 2017-01-23 18:21:57 +0100 | [diff] [blame] | 954 | nf_ct_set(skb, tmpl, IP_CT_NEW); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 955 | } |
| 956 | |
Pablo Neira Ayuso | 08733a0 | 2016-11-03 10:56:43 +0100 | [diff] [blame] | 957 | err = nf_conntrack_in(net, info->family, |
| 958 | NF_INET_PRE_ROUTING, skb); |
Jarno Rajahalme | 5b6b929 | 2016-03-10 10:54:21 -0800 | [diff] [blame] | 959 | if (err != NF_ACCEPT) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 960 | return -ENOENT; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 961 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 962 | /* Clear CT state NAT flags to mark that we have not yet done |
| 963 | * NAT after the nf_conntrack_in() call. We can actually clear |
| 964 | * the whole state, as it will be re-initialized below. |
| 965 | */ |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 966 | key->ct_state = 0; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 967 | |
| 968 | /* Update the key, but keep the NAT flags. */ |
| 969 | ovs_ct_update_key(skb, info, key, true, true); |
Jarno Rajahalme | 28b6e0c | 2016-03-10 10:54:22 -0800 | [diff] [blame] | 970 | } |
Jarno Rajahalme | 394e910 | 2016-03-10 10:54:19 -0800 | [diff] [blame] | 971 | |
Jarno Rajahalme | 28b6e0c | 2016-03-10 10:54:22 -0800 | [diff] [blame] | 972 | ct = nf_ct_get(skb, &ctinfo); |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 973 | if (ct) { |
| 974 | /* Packets starting a new connection must be NATted before the |
| 975 | * helper, so that the helper knows about the NAT. We enforce |
| 976 | * this by delaying both NAT and helper calls for unconfirmed |
| 977 | * connections until the committing CT action. For later |
| 978 | * packets NAT and Helper may be called in either order. |
| 979 | * |
| 980 | * NAT will be done only if the CT action has NAT, and only |
| 981 | * once per packet (per zone), as guarded by the NAT bits in |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 982 | * the key->ct_state. |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 983 | */ |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 984 | if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) && |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 985 | (nf_ct_is_confirmed(ct) || info->commit) && |
| 986 | ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) { |
| 987 | return -EINVAL; |
| 988 | } |
| 989 | |
Joe Stringer | 16ec3d4 | 2016-05-11 10:29:26 -0700 | [diff] [blame] | 990 | /* Userspace may decide to perform a ct lookup without a helper |
| 991 | * specified followed by a (recirculate and) commit with one. |
| 992 | * Therefore, for unconfirmed connections which we will commit, |
| 993 | * we need to attach the helper here. |
| 994 | */ |
| 995 | if (!nf_ct_is_confirmed(ct) && info->commit && |
| 996 | info->helper && !nfct_help(ct)) { |
| 997 | int err = __nf_ct_try_assign_helper(ct, info->ct, |
| 998 | GFP_ATOMIC); |
| 999 | if (err) |
| 1000 | return err; |
| 1001 | } |
| 1002 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1003 | /* Call the helper only if: |
| 1004 | * - nf_conntrack_in() was executed above ("!cached") for a |
| 1005 | * confirmed connection, or |
| 1006 | * - When committing an unconfirmed connection. |
| 1007 | */ |
| 1008 | if ((nf_ct_is_confirmed(ct) ? !cached : info->commit) && |
| 1009 | ovs_ct_helper(skb, info->family) != NF_ACCEPT) { |
| 1010 | return -EINVAL; |
| 1011 | } |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1012 | } |
| 1013 | |
| 1014 | return 0; |
| 1015 | } |
| 1016 | |
| 1017 | /* Lookup connection and read fields into key. */ |
| 1018 | static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key, |
| 1019 | const struct ovs_conntrack_info *info, |
| 1020 | struct sk_buff *skb) |
| 1021 | { |
| 1022 | struct nf_conntrack_expect *exp; |
| 1023 | |
Jarno Rajahalme | 9f13ded | 2016-03-10 10:54:18 -0800 | [diff] [blame] | 1024 | /* If we pass an expected packet through nf_conntrack_in() the |
| 1025 | * expectation is typically removed, but the packet could still be |
| 1026 | * lost in upcall processing. To prevent this from happening we |
| 1027 | * perform an explicit expectation lookup. Expected connections are |
| 1028 | * always new, and will be passed through conntrack only when they are |
| 1029 | * committed, as it is OK to remove the expectation at that time. |
| 1030 | */ |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1031 | exp = ovs_ct_expect_find(net, &info->zone, info->family, skb); |
| 1032 | if (exp) { |
| 1033 | u8 state; |
| 1034 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1035 | /* NOTE: New connections are NATted and Helped only when |
| 1036 | * committed, so we are not calling into NAT here. |
| 1037 | */ |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1038 | state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED; |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 1039 | __ovs_ct_update_key(key, state, &info->zone, exp->master); |
Samuel Gauthier | d913d3a | 2016-06-28 17:22:26 +0200 | [diff] [blame] | 1040 | } else { |
| 1041 | struct nf_conn *ct; |
| 1042 | int err; |
| 1043 | |
| 1044 | err = __ovs_ct_lookup(net, key, info, skb); |
| 1045 | if (err) |
| 1046 | return err; |
| 1047 | |
Florian Westphal | cb9c683 | 2017-01-23 18:21:56 +0100 | [diff] [blame] | 1048 | ct = (struct nf_conn *)skb_nfct(skb); |
Samuel Gauthier | d913d3a | 2016-06-28 17:22:26 +0200 | [diff] [blame] | 1049 | if (ct) |
| 1050 | nf_ct_deliver_cached_events(ct); |
| 1051 | } |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1052 | |
| 1053 | return 0; |
| 1054 | } |
| 1055 | |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 1056 | static bool labels_nonzero(const struct ovs_key_ct_labels *labels) |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1057 | { |
| 1058 | size_t i; |
| 1059 | |
Jarno Rajahalme | cb80d58 | 2017-02-09 11:21:55 -0800 | [diff] [blame] | 1060 | for (i = 0; i < OVS_CT_LABELS_LEN_32; i++) |
| 1061 | if (labels->ct_labels_32[i]) |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1062 | return true; |
| 1063 | |
| 1064 | return false; |
| 1065 | } |
| 1066 | |
Yi-Hung Wei | 11efd5c | 2018-05-24 17:56:43 -0700 | [diff] [blame^] | 1067 | #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) |
| 1068 | static struct hlist_head *ct_limit_hash_bucket( |
| 1069 | const struct ovs_ct_limit_info *info, u16 zone) |
| 1070 | { |
| 1071 | return &info->limits[zone & (CT_LIMIT_HASH_BUCKETS - 1)]; |
| 1072 | } |
| 1073 | |
| 1074 | /* Call with ovs_mutex */ |
| 1075 | static void ct_limit_set(const struct ovs_ct_limit_info *info, |
| 1076 | struct ovs_ct_limit *new_ct_limit) |
| 1077 | { |
| 1078 | struct ovs_ct_limit *ct_limit; |
| 1079 | struct hlist_head *head; |
| 1080 | |
| 1081 | head = ct_limit_hash_bucket(info, new_ct_limit->zone); |
| 1082 | hlist_for_each_entry_rcu(ct_limit, head, hlist_node) { |
| 1083 | if (ct_limit->zone == new_ct_limit->zone) { |
| 1084 | hlist_replace_rcu(&ct_limit->hlist_node, |
| 1085 | &new_ct_limit->hlist_node); |
| 1086 | kfree_rcu(ct_limit, rcu); |
| 1087 | return; |
| 1088 | } |
| 1089 | } |
| 1090 | |
| 1091 | hlist_add_head_rcu(&new_ct_limit->hlist_node, head); |
| 1092 | } |
| 1093 | |
| 1094 | /* Call with ovs_mutex */ |
| 1095 | static void ct_limit_del(const struct ovs_ct_limit_info *info, u16 zone) |
| 1096 | { |
| 1097 | struct ovs_ct_limit *ct_limit; |
| 1098 | struct hlist_head *head; |
| 1099 | struct hlist_node *n; |
| 1100 | |
| 1101 | head = ct_limit_hash_bucket(info, zone); |
| 1102 | hlist_for_each_entry_safe(ct_limit, n, head, hlist_node) { |
| 1103 | if (ct_limit->zone == zone) { |
| 1104 | hlist_del_rcu(&ct_limit->hlist_node); |
| 1105 | kfree_rcu(ct_limit, rcu); |
| 1106 | return; |
| 1107 | } |
| 1108 | } |
| 1109 | } |
| 1110 | |
| 1111 | /* Call with RCU read lock */ |
| 1112 | static u32 ct_limit_get(const struct ovs_ct_limit_info *info, u16 zone) |
| 1113 | { |
| 1114 | struct ovs_ct_limit *ct_limit; |
| 1115 | struct hlist_head *head; |
| 1116 | |
| 1117 | head = ct_limit_hash_bucket(info, zone); |
| 1118 | hlist_for_each_entry_rcu(ct_limit, head, hlist_node) { |
| 1119 | if (ct_limit->zone == zone) |
| 1120 | return ct_limit->limit; |
| 1121 | } |
| 1122 | |
| 1123 | return info->default_limit; |
| 1124 | } |
| 1125 | |
| 1126 | static int ovs_ct_check_limit(struct net *net, |
| 1127 | const struct ovs_conntrack_info *info, |
| 1128 | const struct nf_conntrack_tuple *tuple) |
| 1129 | { |
| 1130 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
| 1131 | const struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info; |
| 1132 | u32 per_zone_limit, connections; |
| 1133 | u32 conncount_key; |
| 1134 | |
| 1135 | conncount_key = info->zone.id; |
| 1136 | |
| 1137 | per_zone_limit = ct_limit_get(ct_limit_info, info->zone.id); |
| 1138 | if (per_zone_limit == OVS_CT_LIMIT_UNLIMITED) |
| 1139 | return 0; |
| 1140 | |
| 1141 | connections = nf_conncount_count(net, ct_limit_info->data, |
| 1142 | &conncount_key, tuple, &info->zone); |
| 1143 | if (connections > per_zone_limit) |
| 1144 | return -ENOMEM; |
| 1145 | |
| 1146 | return 0; |
| 1147 | } |
| 1148 | #endif |
| 1149 | |
Jarno Rajahalme | 7d904c7 | 2016-06-21 14:59:38 -0700 | [diff] [blame] | 1150 | /* Lookup connection and confirm if unconfirmed. */ |
| 1151 | static int ovs_ct_commit(struct net *net, struct sw_flow_key *key, |
| 1152 | const struct ovs_conntrack_info *info, |
| 1153 | struct sk_buff *skb) |
| 1154 | { |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 1155 | enum ip_conntrack_info ctinfo; |
| 1156 | struct nf_conn *ct; |
Jarno Rajahalme | 7d904c7 | 2016-06-21 14:59:38 -0700 | [diff] [blame] | 1157 | int err; |
| 1158 | |
| 1159 | err = __ovs_ct_lookup(net, key, info, skb); |
| 1160 | if (err) |
| 1161 | return err; |
| 1162 | |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 1163 | /* The connection could be invalid, in which case this is a no-op.*/ |
| 1164 | ct = nf_ct_get(skb, &ctinfo); |
| 1165 | if (!ct) |
| 1166 | return 0; |
| 1167 | |
Yi-Hung Wei | 11efd5c | 2018-05-24 17:56:43 -0700 | [diff] [blame^] | 1168 | #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) |
| 1169 | if (static_branch_unlikely(&ovs_ct_limit_enabled)) { |
| 1170 | if (!nf_ct_is_confirmed(ct)) { |
| 1171 | err = ovs_ct_check_limit(net, info, |
| 1172 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
| 1173 | if (err) { |
| 1174 | net_warn_ratelimited("openvswitch: zone: %u " |
| 1175 | "execeeds conntrack limit\n", |
| 1176 | info->zone.id); |
| 1177 | return err; |
| 1178 | } |
| 1179 | } |
| 1180 | } |
| 1181 | #endif |
| 1182 | |
Jarno Rajahalme | 1206455 | 2017-04-21 16:48:06 -0700 | [diff] [blame] | 1183 | /* Set the conntrack event mask if given. NEW and DELETE events have |
| 1184 | * their own groups, but the NFNLGRP_CONNTRACK_UPDATE group listener |
| 1185 | * typically would receive many kinds of updates. Setting the event |
| 1186 | * mask allows those events to be filtered. The set event mask will |
| 1187 | * remain in effect for the lifetime of the connection unless changed |
| 1188 | * by a further CT action with both the commit flag and the eventmask |
| 1189 | * option. */ |
| 1190 | if (info->have_eventmask) { |
| 1191 | struct nf_conntrack_ecache *cache = nf_ct_ecache_find(ct); |
| 1192 | |
| 1193 | if (cache) |
| 1194 | cache->ctmask = info->eventmask; |
| 1195 | } |
| 1196 | |
Jarno Rajahalme | 7d904c7 | 2016-06-21 14:59:38 -0700 | [diff] [blame] | 1197 | /* Apply changes before confirming the connection so that the initial |
| 1198 | * conntrack NEW netlink event carries the values given in the CT |
| 1199 | * action. |
| 1200 | */ |
| 1201 | if (info->mark.mask) { |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 1202 | err = ovs_ct_set_mark(ct, key, info->mark.value, |
Jarno Rajahalme | 7d904c7 | 2016-06-21 14:59:38 -0700 | [diff] [blame] | 1203 | info->mark.mask); |
| 1204 | if (err) |
| 1205 | return err; |
| 1206 | } |
Jarno Rajahalme | 09aa98a | 2017-02-09 11:21:58 -0800 | [diff] [blame] | 1207 | if (!nf_ct_is_confirmed(ct)) { |
| 1208 | err = ovs_ct_init_labels(ct, key, &info->labels.value, |
| 1209 | &info->labels.mask); |
| 1210 | if (err) |
| 1211 | return err; |
| 1212 | } else if (labels_nonzero(&info->labels.mask)) { |
| 1213 | err = ovs_ct_set_labels(ct, key, &info->labels.value, |
| 1214 | &info->labels.mask); |
Jarno Rajahalme | 7d904c7 | 2016-06-21 14:59:38 -0700 | [diff] [blame] | 1215 | if (err) |
| 1216 | return err; |
| 1217 | } |
| 1218 | /* This will take care of sending queued events even if the connection |
| 1219 | * is already confirmed. |
| 1220 | */ |
| 1221 | if (nf_conntrack_confirm(skb) != NF_ACCEPT) |
| 1222 | return -EINVAL; |
| 1223 | |
| 1224 | return 0; |
| 1225 | } |
| 1226 | |
Ed Swierk | 9382fe7 | 2018-01-31 18:48:02 -0800 | [diff] [blame] | 1227 | /* Trim the skb to the length specified by the IP/IPv6 header, |
| 1228 | * removing any trailing lower-layer padding. This prepares the skb |
| 1229 | * for higher-layer processing that assumes skb->len excludes padding |
| 1230 | * (such as nf_ip_checksum). The caller needs to pull the skb to the |
| 1231 | * network header, and ensure ip_hdr/ipv6_hdr points to valid data. |
| 1232 | */ |
| 1233 | static int ovs_skb_network_trim(struct sk_buff *skb) |
| 1234 | { |
| 1235 | unsigned int len; |
| 1236 | int err; |
| 1237 | |
| 1238 | switch (skb->protocol) { |
| 1239 | case htons(ETH_P_IP): |
| 1240 | len = ntohs(ip_hdr(skb)->tot_len); |
| 1241 | break; |
| 1242 | case htons(ETH_P_IPV6): |
| 1243 | len = sizeof(struct ipv6hdr) |
| 1244 | + ntohs(ipv6_hdr(skb)->payload_len); |
| 1245 | break; |
| 1246 | default: |
| 1247 | len = skb->len; |
| 1248 | } |
| 1249 | |
| 1250 | err = pskb_trim_rcsum(skb, len); |
| 1251 | if (err) |
| 1252 | kfree_skb(skb); |
| 1253 | |
| 1254 | return err; |
| 1255 | } |
| 1256 | |
Joe Stringer | 74c1661 | 2015-10-25 20:21:48 -0700 | [diff] [blame] | 1257 | /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero |
| 1258 | * value if 'skb' is freed. |
| 1259 | */ |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1260 | int ovs_ct_execute(struct net *net, struct sk_buff *skb, |
| 1261 | struct sw_flow_key *key, |
| 1262 | const struct ovs_conntrack_info *info) |
| 1263 | { |
| 1264 | int nh_ofs; |
| 1265 | int err; |
| 1266 | |
| 1267 | /* The conntrack module expects to be working at L3. */ |
| 1268 | nh_ofs = skb_network_offset(skb); |
Lance Richardson | 75f01a4 | 2017-01-12 19:33:18 -0500 | [diff] [blame] | 1269 | skb_pull_rcsum(skb, nh_ofs); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1270 | |
Ed Swierk | 9382fe7 | 2018-01-31 18:48:02 -0800 | [diff] [blame] | 1271 | err = ovs_skb_network_trim(skb); |
| 1272 | if (err) |
| 1273 | return err; |
| 1274 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1275 | if (key->ip.frag != OVS_FRAG_TYPE_NONE) { |
| 1276 | err = handle_fragments(net, key, info->zone.id, skb); |
| 1277 | if (err) |
| 1278 | return err; |
| 1279 | } |
| 1280 | |
Joe Stringer | ab38a7b | 2015-10-06 11:00:01 -0700 | [diff] [blame] | 1281 | if (info->commit) |
Jarno Rajahalme | 7d904c7 | 2016-06-21 14:59:38 -0700 | [diff] [blame] | 1282 | err = ovs_ct_commit(net, key, info, skb); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1283 | else |
| 1284 | err = ovs_ct_lookup(net, key, info, skb); |
| 1285 | |
| 1286 | skb_push(skb, nh_ofs); |
Lance Richardson | 75f01a4 | 2017-01-12 19:33:18 -0500 | [diff] [blame] | 1287 | skb_postpush_rcsum(skb, skb->data, nh_ofs); |
Joe Stringer | 74c1661 | 2015-10-25 20:21:48 -0700 | [diff] [blame] | 1288 | if (err) |
| 1289 | kfree_skb(skb); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1290 | return err; |
| 1291 | } |
| 1292 | |
Eric Garver | b822696 | 2017-10-10 16:54:44 -0400 | [diff] [blame] | 1293 | int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key) |
| 1294 | { |
| 1295 | if (skb_nfct(skb)) { |
| 1296 | nf_conntrack_put(skb_nfct(skb)); |
| 1297 | nf_ct_set(skb, NULL, IP_CT_UNTRACKED); |
| 1298 | ovs_ct_fill_key(skb, key); |
| 1299 | } |
| 1300 | |
| 1301 | return 0; |
| 1302 | } |
| 1303 | |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1304 | static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name, |
| 1305 | const struct sw_flow_key *key, bool log) |
| 1306 | { |
| 1307 | struct nf_conntrack_helper *helper; |
| 1308 | struct nf_conn_help *help; |
| 1309 | |
| 1310 | helper = nf_conntrack_helper_try_module_get(name, info->family, |
| 1311 | key->ip.proto); |
| 1312 | if (!helper) { |
| 1313 | OVS_NLERR(log, "Unknown helper \"%s\"", name); |
| 1314 | return -EINVAL; |
| 1315 | } |
| 1316 | |
| 1317 | help = nf_ct_helper_ext_add(info->ct, helper, GFP_KERNEL); |
| 1318 | if (!help) { |
Liping Zhang | d91fc59 | 2017-05-07 22:01:55 +0800 | [diff] [blame] | 1319 | nf_conntrack_helper_put(helper); |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1320 | return -ENOMEM; |
| 1321 | } |
| 1322 | |
| 1323 | rcu_assign_pointer(help->helper, helper); |
| 1324 | info->helper = helper; |
| 1325 | return 0; |
| 1326 | } |
| 1327 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1328 | #ifdef CONFIG_NF_NAT_NEEDED |
| 1329 | static int parse_nat(const struct nlattr *attr, |
| 1330 | struct ovs_conntrack_info *info, bool log) |
| 1331 | { |
| 1332 | struct nlattr *a; |
| 1333 | int rem; |
| 1334 | bool have_ip_max = false; |
| 1335 | bool have_proto_max = false; |
| 1336 | bool ip_vers = (info->family == NFPROTO_IPV6); |
| 1337 | |
| 1338 | nla_for_each_nested(a, attr, rem) { |
| 1339 | static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = { |
| 1340 | [OVS_NAT_ATTR_SRC] = {0, 0}, |
| 1341 | [OVS_NAT_ATTR_DST] = {0, 0}, |
| 1342 | [OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr), |
| 1343 | sizeof(struct in6_addr)}, |
| 1344 | [OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr), |
| 1345 | sizeof(struct in6_addr)}, |
| 1346 | [OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)}, |
| 1347 | [OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)}, |
| 1348 | [OVS_NAT_ATTR_PERSISTENT] = {0, 0}, |
| 1349 | [OVS_NAT_ATTR_PROTO_HASH] = {0, 0}, |
| 1350 | [OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0}, |
| 1351 | }; |
| 1352 | int type = nla_type(a); |
| 1353 | |
| 1354 | if (type > OVS_NAT_ATTR_MAX) { |
Joe Perches | 0ed80da | 2017-08-11 04:26:26 -0700 | [diff] [blame] | 1355 | OVS_NLERR(log, "Unknown NAT attribute (type=%d, max=%d)", |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1356 | type, OVS_NAT_ATTR_MAX); |
| 1357 | return -EINVAL; |
| 1358 | } |
| 1359 | |
| 1360 | if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) { |
Joe Perches | 0ed80da | 2017-08-11 04:26:26 -0700 | [diff] [blame] | 1361 | OVS_NLERR(log, "NAT attribute type %d has unexpected length (%d != %d)", |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1362 | type, nla_len(a), |
| 1363 | ovs_nat_attr_lens[type][ip_vers]); |
| 1364 | return -EINVAL; |
| 1365 | } |
| 1366 | |
| 1367 | switch (type) { |
| 1368 | case OVS_NAT_ATTR_SRC: |
| 1369 | case OVS_NAT_ATTR_DST: |
| 1370 | if (info->nat) { |
Joe Perches | 0ed80da | 2017-08-11 04:26:26 -0700 | [diff] [blame] | 1371 | OVS_NLERR(log, "Only one type of NAT may be specified"); |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1372 | return -ERANGE; |
| 1373 | } |
| 1374 | info->nat |= OVS_CT_NAT; |
| 1375 | info->nat |= ((type == OVS_NAT_ATTR_SRC) |
| 1376 | ? OVS_CT_SRC_NAT : OVS_CT_DST_NAT); |
| 1377 | break; |
| 1378 | |
| 1379 | case OVS_NAT_ATTR_IP_MIN: |
Haishuang Yan | ac71b46 | 2016-03-28 18:08:59 +0800 | [diff] [blame] | 1380 | nla_memcpy(&info->range.min_addr, a, |
| 1381 | sizeof(info->range.min_addr)); |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1382 | info->range.flags |= NF_NAT_RANGE_MAP_IPS; |
| 1383 | break; |
| 1384 | |
| 1385 | case OVS_NAT_ATTR_IP_MAX: |
| 1386 | have_ip_max = true; |
| 1387 | nla_memcpy(&info->range.max_addr, a, |
| 1388 | sizeof(info->range.max_addr)); |
| 1389 | info->range.flags |= NF_NAT_RANGE_MAP_IPS; |
| 1390 | break; |
| 1391 | |
| 1392 | case OVS_NAT_ATTR_PROTO_MIN: |
| 1393 | info->range.min_proto.all = htons(nla_get_u16(a)); |
| 1394 | info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; |
| 1395 | break; |
| 1396 | |
| 1397 | case OVS_NAT_ATTR_PROTO_MAX: |
| 1398 | have_proto_max = true; |
| 1399 | info->range.max_proto.all = htons(nla_get_u16(a)); |
| 1400 | info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; |
| 1401 | break; |
| 1402 | |
| 1403 | case OVS_NAT_ATTR_PERSISTENT: |
| 1404 | info->range.flags |= NF_NAT_RANGE_PERSISTENT; |
| 1405 | break; |
| 1406 | |
| 1407 | case OVS_NAT_ATTR_PROTO_HASH: |
| 1408 | info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM; |
| 1409 | break; |
| 1410 | |
| 1411 | case OVS_NAT_ATTR_PROTO_RANDOM: |
| 1412 | info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY; |
| 1413 | break; |
| 1414 | |
| 1415 | default: |
Joe Perches | 0ed80da | 2017-08-11 04:26:26 -0700 | [diff] [blame] | 1416 | OVS_NLERR(log, "Unknown nat attribute (%d)", type); |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1417 | return -EINVAL; |
| 1418 | } |
| 1419 | } |
| 1420 | |
| 1421 | if (rem > 0) { |
Joe Perches | 0ed80da | 2017-08-11 04:26:26 -0700 | [diff] [blame] | 1422 | OVS_NLERR(log, "NAT attribute has %d unknown bytes", rem); |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1423 | return -EINVAL; |
| 1424 | } |
| 1425 | if (!info->nat) { |
| 1426 | /* Do not allow flags if no type is given. */ |
| 1427 | if (info->range.flags) { |
| 1428 | OVS_NLERR(log, |
Julia Lawall | e0b1084 | 2017-12-27 15:51:38 +0100 | [diff] [blame] | 1429 | "NAT flags may be given only when NAT range (SRC or DST) is also specified." |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1430 | ); |
| 1431 | return -EINVAL; |
| 1432 | } |
| 1433 | info->nat = OVS_CT_NAT; /* NAT existing connections. */ |
| 1434 | } else if (!info->commit) { |
| 1435 | OVS_NLERR(log, |
Julia Lawall | e0b1084 | 2017-12-27 15:51:38 +0100 | [diff] [blame] | 1436 | "NAT attributes may be specified only when CT COMMIT flag is also specified." |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1437 | ); |
| 1438 | return -EINVAL; |
| 1439 | } |
| 1440 | /* Allow missing IP_MAX. */ |
| 1441 | if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) { |
| 1442 | memcpy(&info->range.max_addr, &info->range.min_addr, |
| 1443 | sizeof(info->range.max_addr)); |
| 1444 | } |
| 1445 | /* Allow missing PROTO_MAX. */ |
| 1446 | if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED && |
| 1447 | !have_proto_max) { |
| 1448 | info->range.max_proto.all = info->range.min_proto.all; |
| 1449 | } |
| 1450 | return 0; |
| 1451 | } |
| 1452 | #endif |
| 1453 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1454 | static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = { |
Joe Stringer | ab38a7b | 2015-10-06 11:00:01 -0700 | [diff] [blame] | 1455 | [OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 }, |
Jarno Rajahalme | dd41d33 | 2017-02-09 11:22:00 -0800 | [diff] [blame] | 1456 | [OVS_CT_ATTR_FORCE_COMMIT] = { .minlen = 0, .maxlen = 0 }, |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1457 | [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16), |
| 1458 | .maxlen = sizeof(u16) }, |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 1459 | [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark), |
| 1460 | .maxlen = sizeof(struct md_mark) }, |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 1461 | [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels), |
| 1462 | .maxlen = sizeof(struct md_labels) }, |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1463 | [OVS_CT_ATTR_HELPER] = { .minlen = 1, |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1464 | .maxlen = NF_CT_HELPER_NAME_LEN }, |
| 1465 | #ifdef CONFIG_NF_NAT_NEEDED |
| 1466 | /* NAT length is checked when parsing the nested attributes. */ |
| 1467 | [OVS_CT_ATTR_NAT] = { .minlen = 0, .maxlen = INT_MAX }, |
| 1468 | #endif |
Jarno Rajahalme | 1206455 | 2017-04-21 16:48:06 -0700 | [diff] [blame] | 1469 | [OVS_CT_ATTR_EVENTMASK] = { .minlen = sizeof(u32), |
| 1470 | .maxlen = sizeof(u32) }, |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1471 | }; |
| 1472 | |
| 1473 | static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info, |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1474 | const char **helper, bool log) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1475 | { |
| 1476 | struct nlattr *a; |
| 1477 | int rem; |
| 1478 | |
| 1479 | nla_for_each_nested(a, attr, rem) { |
| 1480 | int type = nla_type(a); |
Liping Zhang | 69ec932 | 2017-07-23 17:52:23 +0800 | [diff] [blame] | 1481 | int maxlen; |
| 1482 | int minlen; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1483 | |
| 1484 | if (type > OVS_CT_ATTR_MAX) { |
| 1485 | OVS_NLERR(log, |
| 1486 | "Unknown conntrack attr (type=%d, max=%d)", |
| 1487 | type, OVS_CT_ATTR_MAX); |
| 1488 | return -EINVAL; |
| 1489 | } |
Liping Zhang | 69ec932 | 2017-07-23 17:52:23 +0800 | [diff] [blame] | 1490 | |
| 1491 | maxlen = ovs_ct_attr_lens[type].maxlen; |
| 1492 | minlen = ovs_ct_attr_lens[type].minlen; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1493 | if (nla_len(a) < minlen || nla_len(a) > maxlen) { |
| 1494 | OVS_NLERR(log, |
| 1495 | "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)", |
| 1496 | type, nla_len(a), maxlen); |
| 1497 | return -EINVAL; |
| 1498 | } |
| 1499 | |
| 1500 | switch (type) { |
Jarno Rajahalme | dd41d33 | 2017-02-09 11:22:00 -0800 | [diff] [blame] | 1501 | case OVS_CT_ATTR_FORCE_COMMIT: |
| 1502 | info->force = true; |
| 1503 | /* fall through. */ |
Joe Stringer | ab38a7b | 2015-10-06 11:00:01 -0700 | [diff] [blame] | 1504 | case OVS_CT_ATTR_COMMIT: |
| 1505 | info->commit = true; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1506 | break; |
| 1507 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 1508 | case OVS_CT_ATTR_ZONE: |
| 1509 | info->zone.id = nla_get_u16(a); |
| 1510 | break; |
| 1511 | #endif |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 1512 | #ifdef CONFIG_NF_CONNTRACK_MARK |
| 1513 | case OVS_CT_ATTR_MARK: { |
| 1514 | struct md_mark *mark = nla_data(a); |
| 1515 | |
Joe Stringer | e754ec6 | 2015-10-19 19:19:00 -0700 | [diff] [blame] | 1516 | if (!mark->mask) { |
| 1517 | OVS_NLERR(log, "ct_mark mask cannot be 0"); |
| 1518 | return -EINVAL; |
| 1519 | } |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 1520 | info->mark = *mark; |
| 1521 | break; |
| 1522 | } |
| 1523 | #endif |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1524 | #ifdef CONFIG_NF_CONNTRACK_LABELS |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 1525 | case OVS_CT_ATTR_LABELS: { |
| 1526 | struct md_labels *labels = nla_data(a); |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1527 | |
Joe Stringer | e754ec6 | 2015-10-19 19:19:00 -0700 | [diff] [blame] | 1528 | if (!labels_nonzero(&labels->mask)) { |
| 1529 | OVS_NLERR(log, "ct_labels mask cannot be 0"); |
| 1530 | return -EINVAL; |
| 1531 | } |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 1532 | info->labels = *labels; |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1533 | break; |
| 1534 | } |
| 1535 | #endif |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1536 | case OVS_CT_ATTR_HELPER: |
| 1537 | *helper = nla_data(a); |
| 1538 | if (!memchr(*helper, '\0', nla_len(a))) { |
| 1539 | OVS_NLERR(log, "Invalid conntrack helper"); |
| 1540 | return -EINVAL; |
| 1541 | } |
| 1542 | break; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1543 | #ifdef CONFIG_NF_NAT_NEEDED |
| 1544 | case OVS_CT_ATTR_NAT: { |
| 1545 | int err = parse_nat(a, info, log); |
| 1546 | |
| 1547 | if (err) |
| 1548 | return err; |
| 1549 | break; |
| 1550 | } |
| 1551 | #endif |
Jarno Rajahalme | 1206455 | 2017-04-21 16:48:06 -0700 | [diff] [blame] | 1552 | case OVS_CT_ATTR_EVENTMASK: |
| 1553 | info->have_eventmask = true; |
| 1554 | info->eventmask = nla_get_u32(a); |
| 1555 | break; |
| 1556 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1557 | default: |
| 1558 | OVS_NLERR(log, "Unknown conntrack attr (%d)", |
| 1559 | type); |
| 1560 | return -EINVAL; |
| 1561 | } |
| 1562 | } |
| 1563 | |
Jarno Rajahalme | 7d904c7 | 2016-06-21 14:59:38 -0700 | [diff] [blame] | 1564 | #ifdef CONFIG_NF_CONNTRACK_MARK |
| 1565 | if (!info->commit && info->mark.mask) { |
| 1566 | OVS_NLERR(log, |
| 1567 | "Setting conntrack mark requires 'commit' flag."); |
| 1568 | return -EINVAL; |
| 1569 | } |
| 1570 | #endif |
| 1571 | #ifdef CONFIG_NF_CONNTRACK_LABELS |
| 1572 | if (!info->commit && labels_nonzero(&info->labels.mask)) { |
| 1573 | OVS_NLERR(log, |
| 1574 | "Setting conntrack labels requires 'commit' flag."); |
| 1575 | return -EINVAL; |
| 1576 | } |
| 1577 | #endif |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1578 | if (rem > 0) { |
| 1579 | OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem); |
| 1580 | return -EINVAL; |
| 1581 | } |
| 1582 | |
| 1583 | return 0; |
| 1584 | } |
| 1585 | |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1586 | bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1587 | { |
| 1588 | if (attr == OVS_KEY_ATTR_CT_STATE) |
| 1589 | return true; |
| 1590 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && |
| 1591 | attr == OVS_KEY_ATTR_CT_ZONE) |
| 1592 | return true; |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 1593 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
| 1594 | attr == OVS_KEY_ATTR_CT_MARK) |
| 1595 | return true; |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1596 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 1597 | attr == OVS_KEY_ATTR_CT_LABELS) { |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1598 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
| 1599 | |
| 1600 | return ovs_net->xt_label; |
| 1601 | } |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1602 | |
| 1603 | return false; |
| 1604 | } |
| 1605 | |
| 1606 | int ovs_ct_copy_action(struct net *net, const struct nlattr *attr, |
| 1607 | const struct sw_flow_key *key, |
| 1608 | struct sw_flow_actions **sfa, bool log) |
| 1609 | { |
| 1610 | struct ovs_conntrack_info ct_info; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1611 | const char *helper = NULL; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1612 | u16 family; |
| 1613 | int err; |
| 1614 | |
| 1615 | family = key_to_nfproto(key); |
| 1616 | if (family == NFPROTO_UNSPEC) { |
| 1617 | OVS_NLERR(log, "ct family unspecified"); |
| 1618 | return -EINVAL; |
| 1619 | } |
| 1620 | |
| 1621 | memset(&ct_info, 0, sizeof(ct_info)); |
| 1622 | ct_info.family = family; |
| 1623 | |
| 1624 | nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID, |
| 1625 | NF_CT_DEFAULT_ZONE_DIR, 0); |
| 1626 | |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1627 | err = parse_ct(attr, &ct_info, &helper, log); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1628 | if (err) |
| 1629 | return err; |
| 1630 | |
| 1631 | /* Set up template for tracking connections in specific zones. */ |
| 1632 | ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL); |
| 1633 | if (!ct_info.ct) { |
| 1634 | OVS_NLERR(log, "Failed to allocate conntrack template"); |
| 1635 | return -ENOMEM; |
| 1636 | } |
Joe Stringer | 90c7afc96 | 2015-12-23 14:39:27 -0800 | [diff] [blame] | 1637 | |
| 1638 | __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status); |
| 1639 | nf_conntrack_get(&ct_info.ct->ct_general); |
| 1640 | |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1641 | if (helper) { |
| 1642 | err = ovs_ct_add_helper(&ct_info, helper, key, log); |
| 1643 | if (err) |
| 1644 | goto err_free_ct; |
| 1645 | } |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1646 | |
| 1647 | err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info, |
| 1648 | sizeof(ct_info), log); |
| 1649 | if (err) |
| 1650 | goto err_free_ct; |
| 1651 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1652 | return 0; |
| 1653 | err_free_ct: |
Joe Stringer | 2f3ab9f | 2015-12-09 14:07:39 -0800 | [diff] [blame] | 1654 | __ovs_ct_free_action(&ct_info); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1655 | return err; |
| 1656 | } |
| 1657 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1658 | #ifdef CONFIG_NF_NAT_NEEDED |
| 1659 | static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info, |
| 1660 | struct sk_buff *skb) |
| 1661 | { |
| 1662 | struct nlattr *start; |
| 1663 | |
| 1664 | start = nla_nest_start(skb, OVS_CT_ATTR_NAT); |
| 1665 | if (!start) |
| 1666 | return false; |
| 1667 | |
| 1668 | if (info->nat & OVS_CT_SRC_NAT) { |
| 1669 | if (nla_put_flag(skb, OVS_NAT_ATTR_SRC)) |
| 1670 | return false; |
| 1671 | } else if (info->nat & OVS_CT_DST_NAT) { |
| 1672 | if (nla_put_flag(skb, OVS_NAT_ATTR_DST)) |
| 1673 | return false; |
| 1674 | } else { |
| 1675 | goto out; |
| 1676 | } |
| 1677 | |
| 1678 | if (info->range.flags & NF_NAT_RANGE_MAP_IPS) { |
Arnd Bergmann | 99b7248 | 2016-03-18 14:33:45 +0100 | [diff] [blame] | 1679 | if (IS_ENABLED(CONFIG_NF_NAT_IPV4) && |
| 1680 | info->family == NFPROTO_IPV4) { |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1681 | if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN, |
| 1682 | info->range.min_addr.ip) || |
| 1683 | (info->range.max_addr.ip |
| 1684 | != info->range.min_addr.ip && |
| 1685 | (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX, |
| 1686 | info->range.max_addr.ip)))) |
| 1687 | return false; |
Arnd Bergmann | 99b7248 | 2016-03-18 14:33:45 +0100 | [diff] [blame] | 1688 | } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) && |
| 1689 | info->family == NFPROTO_IPV6) { |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1690 | if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN, |
| 1691 | &info->range.min_addr.in6) || |
| 1692 | (memcmp(&info->range.max_addr.in6, |
| 1693 | &info->range.min_addr.in6, |
| 1694 | sizeof(info->range.max_addr.in6)) && |
| 1695 | (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX, |
| 1696 | &info->range.max_addr.in6)))) |
| 1697 | return false; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1698 | } else { |
| 1699 | return false; |
| 1700 | } |
| 1701 | } |
| 1702 | if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED && |
| 1703 | (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN, |
| 1704 | ntohs(info->range.min_proto.all)) || |
| 1705 | (info->range.max_proto.all != info->range.min_proto.all && |
| 1706 | nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX, |
| 1707 | ntohs(info->range.max_proto.all))))) |
| 1708 | return false; |
| 1709 | |
| 1710 | if (info->range.flags & NF_NAT_RANGE_PERSISTENT && |
| 1711 | nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT)) |
| 1712 | return false; |
| 1713 | if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM && |
| 1714 | nla_put_flag(skb, OVS_NAT_ATTR_PROTO_HASH)) |
| 1715 | return false; |
| 1716 | if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY && |
| 1717 | nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM)) |
| 1718 | return false; |
| 1719 | out: |
| 1720 | nla_nest_end(skb, start); |
| 1721 | |
| 1722 | return true; |
| 1723 | } |
| 1724 | #endif |
| 1725 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1726 | int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info, |
| 1727 | struct sk_buff *skb) |
| 1728 | { |
| 1729 | struct nlattr *start; |
| 1730 | |
| 1731 | start = nla_nest_start(skb, OVS_ACTION_ATTR_CT); |
| 1732 | if (!start) |
| 1733 | return -EMSGSIZE; |
| 1734 | |
Jarno Rajahalme | dd41d33 | 2017-02-09 11:22:00 -0800 | [diff] [blame] | 1735 | if (ct_info->commit && nla_put_flag(skb, ct_info->force |
| 1736 | ? OVS_CT_ATTR_FORCE_COMMIT |
| 1737 | : OVS_CT_ATTR_COMMIT)) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1738 | return -EMSGSIZE; |
| 1739 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && |
| 1740 | nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id)) |
| 1741 | return -EMSGSIZE; |
Joe Stringer | e754ec6 | 2015-10-19 19:19:00 -0700 | [diff] [blame] | 1742 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask && |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 1743 | nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark), |
| 1744 | &ct_info->mark)) |
| 1745 | return -EMSGSIZE; |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1746 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
Joe Stringer | e754ec6 | 2015-10-19 19:19:00 -0700 | [diff] [blame] | 1747 | labels_nonzero(&ct_info->labels.mask) && |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 1748 | nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels), |
| 1749 | &ct_info->labels)) |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1750 | return -EMSGSIZE; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1751 | if (ct_info->helper) { |
| 1752 | if (nla_put_string(skb, OVS_CT_ATTR_HELPER, |
| 1753 | ct_info->helper->name)) |
| 1754 | return -EMSGSIZE; |
| 1755 | } |
Jarno Rajahalme | 1206455 | 2017-04-21 16:48:06 -0700 | [diff] [blame] | 1756 | if (ct_info->have_eventmask && |
| 1757 | nla_put_u32(skb, OVS_CT_ATTR_EVENTMASK, ct_info->eventmask)) |
| 1758 | return -EMSGSIZE; |
| 1759 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1760 | #ifdef CONFIG_NF_NAT_NEEDED |
| 1761 | if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb)) |
| 1762 | return -EMSGSIZE; |
| 1763 | #endif |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1764 | nla_nest_end(skb, start); |
| 1765 | |
| 1766 | return 0; |
| 1767 | } |
| 1768 | |
| 1769 | void ovs_ct_free_action(const struct nlattr *a) |
| 1770 | { |
| 1771 | struct ovs_conntrack_info *ct_info = nla_data(a); |
| 1772 | |
Joe Stringer | 2f3ab9f | 2015-12-09 14:07:39 -0800 | [diff] [blame] | 1773 | __ovs_ct_free_action(ct_info); |
| 1774 | } |
| 1775 | |
| 1776 | static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info) |
| 1777 | { |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1778 | if (ct_info->helper) |
Liping Zhang | d91fc59 | 2017-05-07 22:01:55 +0800 | [diff] [blame] | 1779 | nf_conntrack_helper_put(ct_info->helper); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1780 | if (ct_info->ct) |
Joe Stringer | 7664423 | 2016-09-01 18:01:47 -0700 | [diff] [blame] | 1781 | nf_ct_tmpl_free(ct_info->ct); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1782 | } |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1783 | |
Yi-Hung Wei | 11efd5c | 2018-05-24 17:56:43 -0700 | [diff] [blame^] | 1784 | #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) |
| 1785 | static int ovs_ct_limit_init(struct net *net, struct ovs_net *ovs_net) |
| 1786 | { |
| 1787 | int i, err; |
| 1788 | |
| 1789 | ovs_net->ct_limit_info = kmalloc(sizeof(*ovs_net->ct_limit_info), |
| 1790 | GFP_KERNEL); |
| 1791 | if (!ovs_net->ct_limit_info) |
| 1792 | return -ENOMEM; |
| 1793 | |
| 1794 | ovs_net->ct_limit_info->default_limit = OVS_CT_LIMIT_DEFAULT; |
| 1795 | ovs_net->ct_limit_info->limits = |
| 1796 | kmalloc_array(CT_LIMIT_HASH_BUCKETS, sizeof(struct hlist_head), |
| 1797 | GFP_KERNEL); |
| 1798 | if (!ovs_net->ct_limit_info->limits) { |
| 1799 | kfree(ovs_net->ct_limit_info); |
| 1800 | return -ENOMEM; |
| 1801 | } |
| 1802 | |
| 1803 | for (i = 0; i < CT_LIMIT_HASH_BUCKETS; i++) |
| 1804 | INIT_HLIST_HEAD(&ovs_net->ct_limit_info->limits[i]); |
| 1805 | |
| 1806 | ovs_net->ct_limit_info->data = |
| 1807 | nf_conncount_init(net, NFPROTO_INET, sizeof(u32)); |
| 1808 | |
| 1809 | if (IS_ERR(ovs_net->ct_limit_info->data)) { |
| 1810 | err = PTR_ERR(ovs_net->ct_limit_info->data); |
| 1811 | kfree(ovs_net->ct_limit_info->limits); |
| 1812 | kfree(ovs_net->ct_limit_info); |
| 1813 | pr_err("openvswitch: failed to init nf_conncount %d\n", err); |
| 1814 | return err; |
| 1815 | } |
| 1816 | return 0; |
| 1817 | } |
| 1818 | |
| 1819 | static void ovs_ct_limit_exit(struct net *net, struct ovs_net *ovs_net) |
| 1820 | { |
| 1821 | const struct ovs_ct_limit_info *info = ovs_net->ct_limit_info; |
| 1822 | int i; |
| 1823 | |
| 1824 | nf_conncount_destroy(net, NFPROTO_INET, info->data); |
| 1825 | for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) { |
| 1826 | struct hlist_head *head = &info->limits[i]; |
| 1827 | struct ovs_ct_limit *ct_limit; |
| 1828 | |
| 1829 | hlist_for_each_entry_rcu(ct_limit, head, hlist_node) |
| 1830 | kfree_rcu(ct_limit, rcu); |
| 1831 | } |
| 1832 | kfree(ovs_net->ct_limit_info->limits); |
| 1833 | kfree(ovs_net->ct_limit_info); |
| 1834 | } |
| 1835 | |
| 1836 | static struct sk_buff * |
| 1837 | ovs_ct_limit_cmd_reply_start(struct genl_info *info, u8 cmd, |
| 1838 | struct ovs_header **ovs_reply_header) |
| 1839 | { |
| 1840 | struct ovs_header *ovs_header = info->userhdr; |
| 1841 | struct sk_buff *skb; |
| 1842 | |
| 1843 | skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 1844 | if (!skb) |
| 1845 | return ERR_PTR(-ENOMEM); |
| 1846 | |
| 1847 | *ovs_reply_header = genlmsg_put(skb, info->snd_portid, |
| 1848 | info->snd_seq, |
| 1849 | &dp_ct_limit_genl_family, 0, cmd); |
| 1850 | |
| 1851 | if (!*ovs_reply_header) { |
| 1852 | nlmsg_free(skb); |
| 1853 | return ERR_PTR(-EMSGSIZE); |
| 1854 | } |
| 1855 | (*ovs_reply_header)->dp_ifindex = ovs_header->dp_ifindex; |
| 1856 | |
| 1857 | return skb; |
| 1858 | } |
| 1859 | |
| 1860 | static bool check_zone_id(int zone_id, u16 *pzone) |
| 1861 | { |
| 1862 | if (zone_id >= 0 && zone_id <= 65535) { |
| 1863 | *pzone = (u16)zone_id; |
| 1864 | return true; |
| 1865 | } |
| 1866 | return false; |
| 1867 | } |
| 1868 | |
| 1869 | static int ovs_ct_limit_set_zone_limit(struct nlattr *nla_zone_limit, |
| 1870 | struct ovs_ct_limit_info *info) |
| 1871 | { |
| 1872 | struct ovs_zone_limit *zone_limit; |
| 1873 | int rem; |
| 1874 | u16 zone; |
| 1875 | |
| 1876 | rem = NLA_ALIGN(nla_len(nla_zone_limit)); |
| 1877 | zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit); |
| 1878 | |
| 1879 | while (rem >= sizeof(*zone_limit)) { |
| 1880 | if (unlikely(zone_limit->zone_id == |
| 1881 | OVS_ZONE_LIMIT_DEFAULT_ZONE)) { |
| 1882 | ovs_lock(); |
| 1883 | info->default_limit = zone_limit->limit; |
| 1884 | ovs_unlock(); |
| 1885 | } else if (unlikely(!check_zone_id( |
| 1886 | zone_limit->zone_id, &zone))) { |
| 1887 | OVS_NLERR(true, "zone id is out of range"); |
| 1888 | } else { |
| 1889 | struct ovs_ct_limit *ct_limit; |
| 1890 | |
| 1891 | ct_limit = kmalloc(sizeof(*ct_limit), GFP_KERNEL); |
| 1892 | if (!ct_limit) |
| 1893 | return -ENOMEM; |
| 1894 | |
| 1895 | ct_limit->zone = zone; |
| 1896 | ct_limit->limit = zone_limit->limit; |
| 1897 | |
| 1898 | ovs_lock(); |
| 1899 | ct_limit_set(info, ct_limit); |
| 1900 | ovs_unlock(); |
| 1901 | } |
| 1902 | rem -= NLA_ALIGN(sizeof(*zone_limit)); |
| 1903 | zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit + |
| 1904 | NLA_ALIGN(sizeof(*zone_limit))); |
| 1905 | } |
| 1906 | |
| 1907 | if (rem) |
| 1908 | OVS_NLERR(true, "set zone limit has %d unknown bytes", rem); |
| 1909 | |
| 1910 | return 0; |
| 1911 | } |
| 1912 | |
| 1913 | static int ovs_ct_limit_del_zone_limit(struct nlattr *nla_zone_limit, |
| 1914 | struct ovs_ct_limit_info *info) |
| 1915 | { |
| 1916 | struct ovs_zone_limit *zone_limit; |
| 1917 | int rem; |
| 1918 | u16 zone; |
| 1919 | |
| 1920 | rem = NLA_ALIGN(nla_len(nla_zone_limit)); |
| 1921 | zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit); |
| 1922 | |
| 1923 | while (rem >= sizeof(*zone_limit)) { |
| 1924 | if (unlikely(zone_limit->zone_id == |
| 1925 | OVS_ZONE_LIMIT_DEFAULT_ZONE)) { |
| 1926 | ovs_lock(); |
| 1927 | info->default_limit = OVS_CT_LIMIT_DEFAULT; |
| 1928 | ovs_unlock(); |
| 1929 | } else if (unlikely(!check_zone_id( |
| 1930 | zone_limit->zone_id, &zone))) { |
| 1931 | OVS_NLERR(true, "zone id is out of range"); |
| 1932 | } else { |
| 1933 | ovs_lock(); |
| 1934 | ct_limit_del(info, zone); |
| 1935 | ovs_unlock(); |
| 1936 | } |
| 1937 | rem -= NLA_ALIGN(sizeof(*zone_limit)); |
| 1938 | zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit + |
| 1939 | NLA_ALIGN(sizeof(*zone_limit))); |
| 1940 | } |
| 1941 | |
| 1942 | if (rem) |
| 1943 | OVS_NLERR(true, "del zone limit has %d unknown bytes", rem); |
| 1944 | |
| 1945 | return 0; |
| 1946 | } |
| 1947 | |
| 1948 | static int ovs_ct_limit_get_default_limit(struct ovs_ct_limit_info *info, |
| 1949 | struct sk_buff *reply) |
| 1950 | { |
| 1951 | struct ovs_zone_limit zone_limit; |
| 1952 | int err; |
| 1953 | |
| 1954 | zone_limit.zone_id = OVS_ZONE_LIMIT_DEFAULT_ZONE; |
| 1955 | zone_limit.limit = info->default_limit; |
| 1956 | err = nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit); |
| 1957 | if (err) |
| 1958 | return err; |
| 1959 | |
| 1960 | return 0; |
| 1961 | } |
| 1962 | |
| 1963 | static int __ovs_ct_limit_get_zone_limit(struct net *net, |
| 1964 | struct nf_conncount_data *data, |
| 1965 | u16 zone_id, u32 limit, |
| 1966 | struct sk_buff *reply) |
| 1967 | { |
| 1968 | struct nf_conntrack_zone ct_zone; |
| 1969 | struct ovs_zone_limit zone_limit; |
| 1970 | u32 conncount_key = zone_id; |
| 1971 | |
| 1972 | zone_limit.zone_id = zone_id; |
| 1973 | zone_limit.limit = limit; |
| 1974 | nf_ct_zone_init(&ct_zone, zone_id, NF_CT_DEFAULT_ZONE_DIR, 0); |
| 1975 | |
| 1976 | zone_limit.count = nf_conncount_count(net, data, &conncount_key, NULL, |
| 1977 | &ct_zone); |
| 1978 | return nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit); |
| 1979 | } |
| 1980 | |
| 1981 | static int ovs_ct_limit_get_zone_limit(struct net *net, |
| 1982 | struct nlattr *nla_zone_limit, |
| 1983 | struct ovs_ct_limit_info *info, |
| 1984 | struct sk_buff *reply) |
| 1985 | { |
| 1986 | struct ovs_zone_limit *zone_limit; |
| 1987 | int rem, err; |
| 1988 | u32 limit; |
| 1989 | u16 zone; |
| 1990 | |
| 1991 | rem = NLA_ALIGN(nla_len(nla_zone_limit)); |
| 1992 | zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit); |
| 1993 | |
| 1994 | while (rem >= sizeof(*zone_limit)) { |
| 1995 | if (unlikely(zone_limit->zone_id == |
| 1996 | OVS_ZONE_LIMIT_DEFAULT_ZONE)) { |
| 1997 | err = ovs_ct_limit_get_default_limit(info, reply); |
| 1998 | if (err) |
| 1999 | return err; |
| 2000 | } else if (unlikely(!check_zone_id(zone_limit->zone_id, |
| 2001 | &zone))) { |
| 2002 | OVS_NLERR(true, "zone id is out of range"); |
| 2003 | } else { |
| 2004 | rcu_read_lock(); |
| 2005 | limit = ct_limit_get(info, zone); |
| 2006 | rcu_read_unlock(); |
| 2007 | |
| 2008 | err = __ovs_ct_limit_get_zone_limit( |
| 2009 | net, info->data, zone, limit, reply); |
| 2010 | if (err) |
| 2011 | return err; |
| 2012 | } |
| 2013 | rem -= NLA_ALIGN(sizeof(*zone_limit)); |
| 2014 | zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit + |
| 2015 | NLA_ALIGN(sizeof(*zone_limit))); |
| 2016 | } |
| 2017 | |
| 2018 | if (rem) |
| 2019 | OVS_NLERR(true, "get zone limit has %d unknown bytes", rem); |
| 2020 | |
| 2021 | return 0; |
| 2022 | } |
| 2023 | |
| 2024 | static int ovs_ct_limit_get_all_zone_limit(struct net *net, |
| 2025 | struct ovs_ct_limit_info *info, |
| 2026 | struct sk_buff *reply) |
| 2027 | { |
| 2028 | struct ovs_ct_limit *ct_limit; |
| 2029 | struct hlist_head *head; |
| 2030 | int i, err = 0; |
| 2031 | |
| 2032 | err = ovs_ct_limit_get_default_limit(info, reply); |
| 2033 | if (err) |
| 2034 | return err; |
| 2035 | |
| 2036 | rcu_read_lock(); |
| 2037 | for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) { |
| 2038 | head = &info->limits[i]; |
| 2039 | hlist_for_each_entry_rcu(ct_limit, head, hlist_node) { |
| 2040 | err = __ovs_ct_limit_get_zone_limit(net, info->data, |
| 2041 | ct_limit->zone, ct_limit->limit, reply); |
| 2042 | if (err) |
| 2043 | goto exit_err; |
| 2044 | } |
| 2045 | } |
| 2046 | |
| 2047 | exit_err: |
| 2048 | rcu_read_unlock(); |
| 2049 | return err; |
| 2050 | } |
| 2051 | |
| 2052 | static int ovs_ct_limit_cmd_set(struct sk_buff *skb, struct genl_info *info) |
| 2053 | { |
| 2054 | struct nlattr **a = info->attrs; |
| 2055 | struct sk_buff *reply; |
| 2056 | struct ovs_header *ovs_reply_header; |
| 2057 | struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); |
| 2058 | struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info; |
| 2059 | int err; |
| 2060 | |
| 2061 | reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_SET, |
| 2062 | &ovs_reply_header); |
| 2063 | if (IS_ERR(reply)) |
| 2064 | return PTR_ERR(reply); |
| 2065 | |
| 2066 | if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) { |
| 2067 | err = -EINVAL; |
| 2068 | goto exit_err; |
| 2069 | } |
| 2070 | |
| 2071 | err = ovs_ct_limit_set_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], |
| 2072 | ct_limit_info); |
| 2073 | if (err) |
| 2074 | goto exit_err; |
| 2075 | |
| 2076 | static_branch_enable(&ovs_ct_limit_enabled); |
| 2077 | |
| 2078 | genlmsg_end(reply, ovs_reply_header); |
| 2079 | return genlmsg_reply(reply, info); |
| 2080 | |
| 2081 | exit_err: |
| 2082 | nlmsg_free(reply); |
| 2083 | return err; |
| 2084 | } |
| 2085 | |
| 2086 | static int ovs_ct_limit_cmd_del(struct sk_buff *skb, struct genl_info *info) |
| 2087 | { |
| 2088 | struct nlattr **a = info->attrs; |
| 2089 | struct sk_buff *reply; |
| 2090 | struct ovs_header *ovs_reply_header; |
| 2091 | struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); |
| 2092 | struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info; |
| 2093 | int err; |
| 2094 | |
| 2095 | reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_DEL, |
| 2096 | &ovs_reply_header); |
| 2097 | if (IS_ERR(reply)) |
| 2098 | return PTR_ERR(reply); |
| 2099 | |
| 2100 | if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) { |
| 2101 | err = -EINVAL; |
| 2102 | goto exit_err; |
| 2103 | } |
| 2104 | |
| 2105 | err = ovs_ct_limit_del_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], |
| 2106 | ct_limit_info); |
| 2107 | if (err) |
| 2108 | goto exit_err; |
| 2109 | |
| 2110 | genlmsg_end(reply, ovs_reply_header); |
| 2111 | return genlmsg_reply(reply, info); |
| 2112 | |
| 2113 | exit_err: |
| 2114 | nlmsg_free(reply); |
| 2115 | return err; |
| 2116 | } |
| 2117 | |
| 2118 | static int ovs_ct_limit_cmd_get(struct sk_buff *skb, struct genl_info *info) |
| 2119 | { |
| 2120 | struct nlattr **a = info->attrs; |
| 2121 | struct nlattr *nla_reply; |
| 2122 | struct sk_buff *reply; |
| 2123 | struct ovs_header *ovs_reply_header; |
| 2124 | struct net *net = sock_net(skb->sk); |
| 2125 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
| 2126 | struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info; |
| 2127 | int err; |
| 2128 | |
| 2129 | reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_GET, |
| 2130 | &ovs_reply_header); |
| 2131 | if (IS_ERR(reply)) |
| 2132 | return PTR_ERR(reply); |
| 2133 | |
| 2134 | nla_reply = nla_nest_start(reply, OVS_CT_LIMIT_ATTR_ZONE_LIMIT); |
| 2135 | |
| 2136 | if (a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) { |
| 2137 | err = ovs_ct_limit_get_zone_limit( |
| 2138 | net, a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], ct_limit_info, |
| 2139 | reply); |
| 2140 | if (err) |
| 2141 | goto exit_err; |
| 2142 | } else { |
| 2143 | err = ovs_ct_limit_get_all_zone_limit(net, ct_limit_info, |
| 2144 | reply); |
| 2145 | if (err) |
| 2146 | goto exit_err; |
| 2147 | } |
| 2148 | |
| 2149 | nla_nest_end(reply, nla_reply); |
| 2150 | genlmsg_end(reply, ovs_reply_header); |
| 2151 | return genlmsg_reply(reply, info); |
| 2152 | |
| 2153 | exit_err: |
| 2154 | nlmsg_free(reply); |
| 2155 | return err; |
| 2156 | } |
| 2157 | |
| 2158 | static struct genl_ops ct_limit_genl_ops[] = { |
| 2159 | { .cmd = OVS_CT_LIMIT_CMD_SET, |
| 2160 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN |
| 2161 | * privilege. */ |
| 2162 | .policy = ct_limit_policy, |
| 2163 | .doit = ovs_ct_limit_cmd_set, |
| 2164 | }, |
| 2165 | { .cmd = OVS_CT_LIMIT_CMD_DEL, |
| 2166 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN |
| 2167 | * privilege. */ |
| 2168 | .policy = ct_limit_policy, |
| 2169 | .doit = ovs_ct_limit_cmd_del, |
| 2170 | }, |
| 2171 | { .cmd = OVS_CT_LIMIT_CMD_GET, |
| 2172 | .flags = 0, /* OK for unprivileged users. */ |
| 2173 | .policy = ct_limit_policy, |
| 2174 | .doit = ovs_ct_limit_cmd_get, |
| 2175 | }, |
| 2176 | }; |
| 2177 | |
| 2178 | static const struct genl_multicast_group ovs_ct_limit_multicast_group = { |
| 2179 | .name = OVS_CT_LIMIT_MCGROUP, |
| 2180 | }; |
| 2181 | |
| 2182 | struct genl_family dp_ct_limit_genl_family __ro_after_init = { |
| 2183 | .hdrsize = sizeof(struct ovs_header), |
| 2184 | .name = OVS_CT_LIMIT_FAMILY, |
| 2185 | .version = OVS_CT_LIMIT_VERSION, |
| 2186 | .maxattr = OVS_CT_LIMIT_ATTR_MAX, |
| 2187 | .netnsok = true, |
| 2188 | .parallel_ops = true, |
| 2189 | .ops = ct_limit_genl_ops, |
| 2190 | .n_ops = ARRAY_SIZE(ct_limit_genl_ops), |
| 2191 | .mcgrps = &ovs_ct_limit_multicast_group, |
| 2192 | .n_mcgrps = 1, |
| 2193 | .module = THIS_MODULE, |
| 2194 | }; |
| 2195 | #endif |
| 2196 | |
| 2197 | int ovs_ct_init(struct net *net) |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 2198 | { |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 2199 | unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE; |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 2200 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
| 2201 | |
Florian Westphal | adff6c6 | 2016-04-12 18:14:25 +0200 | [diff] [blame] | 2202 | if (nf_connlabels_get(net, n_bits - 1)) { |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 2203 | ovs_net->xt_label = false; |
| 2204 | OVS_NLERR(true, "Failed to set connlabel length"); |
| 2205 | } else { |
| 2206 | ovs_net->xt_label = true; |
| 2207 | } |
Yi-Hung Wei | 11efd5c | 2018-05-24 17:56:43 -0700 | [diff] [blame^] | 2208 | |
| 2209 | #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) |
| 2210 | return ovs_ct_limit_init(net, ovs_net); |
| 2211 | #else |
| 2212 | return 0; |
| 2213 | #endif |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 2214 | } |
| 2215 | |
| 2216 | void ovs_ct_exit(struct net *net) |
| 2217 | { |
| 2218 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
| 2219 | |
Yi-Hung Wei | 11efd5c | 2018-05-24 17:56:43 -0700 | [diff] [blame^] | 2220 | #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) |
| 2221 | ovs_ct_limit_exit(net, ovs_net); |
| 2222 | #endif |
| 2223 | |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 2224 | if (ovs_net->xt_label) |
| 2225 | nf_connlabels_put(net); |
| 2226 | } |