| /* |
| * Copyright (c) 2015 Nicira, Inc. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of version 2 of the GNU General Public |
| * License as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/openvswitch.h> |
| #include <net/ip.h> |
| #include <net/netfilter/nf_conntrack_core.h> |
| #include <net/netfilter/nf_conntrack_helper.h> |
| #include <net/netfilter/nf_conntrack_labels.h> |
| #include <net/netfilter/nf_conntrack_zones.h> |
| #include <net/netfilter/ipv6/nf_defrag_ipv6.h> |
| |
| #include "datapath.h" |
| #include "conntrack.h" |
| #include "flow.h" |
| #include "flow_netlink.h" |
| |
| struct ovs_ct_len_tbl { |
| size_t maxlen; |
| size_t minlen; |
| }; |
| |
| /* Metadata mark for masked write to conntrack mark */ |
| struct md_mark { |
| u32 value; |
| u32 mask; |
| }; |
| |
| /* Metadata label for masked write to conntrack label. */ |
| struct md_labels { |
| struct ovs_key_ct_labels value; |
| struct ovs_key_ct_labels mask; |
| }; |
| |
| /* Conntrack action context for execution. */ |
| struct ovs_conntrack_info { |
| struct nf_conntrack_helper *helper; |
| struct nf_conntrack_zone zone; |
| struct nf_conn *ct; |
| u32 flags; |
| u16 family; |
| struct md_mark mark; |
| struct md_labels labels; |
| }; |
| |
| static u16 key_to_nfproto(const struct sw_flow_key *key) |
| { |
| switch (ntohs(key->eth.type)) { |
| case ETH_P_IP: |
| return NFPROTO_IPV4; |
| case ETH_P_IPV6: |
| return NFPROTO_IPV6; |
| default: |
| return NFPROTO_UNSPEC; |
| } |
| } |
| |
| /* Map SKB connection state into the values used by flow definition. */ |
| static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo) |
| { |
| u8 ct_state = OVS_CS_F_TRACKED; |
| |
| switch (ctinfo) { |
| case IP_CT_ESTABLISHED_REPLY: |
| case IP_CT_RELATED_REPLY: |
| case IP_CT_NEW_REPLY: |
| ct_state |= OVS_CS_F_REPLY_DIR; |
| break; |
| default: |
| break; |
| } |
| |
| switch (ctinfo) { |
| case IP_CT_ESTABLISHED: |
| case IP_CT_ESTABLISHED_REPLY: |
| ct_state |= OVS_CS_F_ESTABLISHED; |
| break; |
| case IP_CT_RELATED: |
| case IP_CT_RELATED_REPLY: |
| ct_state |= OVS_CS_F_RELATED; |
| break; |
| case IP_CT_NEW: |
| case IP_CT_NEW_REPLY: |
| ct_state |= OVS_CS_F_NEW; |
| break; |
| default: |
| break; |
| } |
| |
| return ct_state; |
| } |
| |
| static u32 ovs_ct_get_mark(const struct nf_conn *ct) |
| { |
| #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) |
| return ct ? ct->mark : 0; |
| #else |
| return 0; |
| #endif |
| } |
| |
| static void ovs_ct_get_labels(const struct nf_conn *ct, |
| struct ovs_key_ct_labels *labels) |
| { |
| struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL; |
| |
| if (cl) { |
| size_t len = cl->words * sizeof(long); |
| |
| if (len > OVS_CT_LABELS_LEN) |
| len = OVS_CT_LABELS_LEN; |
| else if (len < OVS_CT_LABELS_LEN) |
| memset(labels, 0, OVS_CT_LABELS_LEN); |
| memcpy(labels, cl->bits, len); |
| } else { |
| memset(labels, 0, OVS_CT_LABELS_LEN); |
| } |
| } |
| |
| static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state, |
| const struct nf_conntrack_zone *zone, |
| const struct nf_conn *ct) |
| { |
| key->ct.state = state; |
| key->ct.zone = zone->id; |
| key->ct.mark = ovs_ct_get_mark(ct); |
| ovs_ct_get_labels(ct, &key->ct.labels); |
| } |
| |
| /* Update 'key' based on skb->nfct. If 'post_ct' is true, then OVS has |
| * previously sent the packet to conntrack via the ct action. |
| */ |
| static void ovs_ct_update_key(const struct sk_buff *skb, |
| struct sw_flow_key *key, bool post_ct) |
| { |
| const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt; |
| enum ip_conntrack_info ctinfo; |
| struct nf_conn *ct; |
| u8 state = 0; |
| |
| ct = nf_ct_get(skb, &ctinfo); |
| if (ct) { |
| state = ovs_ct_get_state(ctinfo); |
| if (ct->master) |
| state |= OVS_CS_F_RELATED; |
| zone = nf_ct_zone(ct); |
| } else if (post_ct) { |
| state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID; |
| } |
| __ovs_ct_update_key(key, state, zone, ct); |
| } |
| |
| void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key) |
| { |
| ovs_ct_update_key(skb, key, false); |
| } |
| |
| int ovs_ct_put_key(const struct sw_flow_key *key, struct sk_buff *skb) |
| { |
| if (nla_put_u8(skb, OVS_KEY_ATTR_CT_STATE, key->ct.state)) |
| return -EMSGSIZE; |
| |
| if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && |
| nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, key->ct.zone)) |
| return -EMSGSIZE; |
| |
| if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
| nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, key->ct.mark)) |
| return -EMSGSIZE; |
| |
| if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
| nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(key->ct.labels), |
| &key->ct.labels)) |
| return -EMSGSIZE; |
| |
| return 0; |
| } |
| |
| static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key, |
| u32 ct_mark, u32 mask) |
| { |
| #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) |
| enum ip_conntrack_info ctinfo; |
| struct nf_conn *ct; |
| u32 new_mark; |
| |
| |
| /* The connection could be invalid, in which case set_mark is no-op. */ |
| ct = nf_ct_get(skb, &ctinfo); |
| if (!ct) |
| return 0; |
| |
| new_mark = ct_mark | (ct->mark & ~(mask)); |
| if (ct->mark != new_mark) { |
| ct->mark = new_mark; |
| nf_conntrack_event_cache(IPCT_MARK, ct); |
| key->ct.mark = new_mark; |
| } |
| |
| return 0; |
| #else |
| return -ENOTSUPP; |
| #endif |
| } |
| |
| static int ovs_ct_set_labels(struct sk_buff *skb, struct sw_flow_key *key, |
| const struct ovs_key_ct_labels *labels, |
| const struct ovs_key_ct_labels *mask) |
| { |
| enum ip_conntrack_info ctinfo; |
| struct nf_conn_labels *cl; |
| struct nf_conn *ct; |
| int err; |
| |
| if (!IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)) |
| return -ENOTSUPP; |
| |
| /* The connection could be invalid, in which case set_label is no-op.*/ |
| ct = nf_ct_get(skb, &ctinfo); |
| if (!ct) |
| return 0; |
| |
| cl = nf_ct_labels_find(ct); |
| if (!cl) { |
| nf_ct_labels_ext_add(ct); |
| cl = nf_ct_labels_find(ct); |
| } |
| if (!cl || cl->words * sizeof(long) < OVS_CT_LABELS_LEN) |
| return -ENOSPC; |
| |
| err = nf_connlabels_replace(ct, (u32 *)labels, (u32 *)mask, |
| OVS_CT_LABELS_LEN / sizeof(u32)); |
| if (err) |
| return err; |
| |
| ovs_ct_get_labels(ct, &key->ct.labels); |
| return 0; |
| } |
| |
| /* 'skb' should already be pulled to nh_ofs. */ |
| static int ovs_ct_helper(struct sk_buff *skb, u16 proto) |
| { |
| const struct nf_conntrack_helper *helper; |
| const struct nf_conn_help *help; |
| enum ip_conntrack_info ctinfo; |
| unsigned int protoff; |
| struct nf_conn *ct; |
| |
| ct = nf_ct_get(skb, &ctinfo); |
| if (!ct || ctinfo == IP_CT_RELATED_REPLY) |
| return NF_ACCEPT; |
| |
| help = nfct_help(ct); |
| if (!help) |
| return NF_ACCEPT; |
| |
| helper = rcu_dereference(help->helper); |
| if (!helper) |
| return NF_ACCEPT; |
| |
| switch (proto) { |
| case NFPROTO_IPV4: |
| protoff = ip_hdrlen(skb); |
| break; |
| case NFPROTO_IPV6: { |
| u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
| __be16 frag_off; |
| int ofs; |
| |
| ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, |
| &frag_off); |
| if (ofs < 0 || (frag_off & htons(~0x7)) != 0) { |
| pr_debug("proto header not found\n"); |
| return NF_ACCEPT; |
| } |
| protoff = ofs; |
| break; |
| } |
| default: |
| WARN_ONCE(1, "helper invoked on non-IP family!"); |
| return NF_DROP; |
| } |
| |
| return helper->help(skb, protoff, ct, ctinfo); |
| } |
| |
| static int handle_fragments(struct net *net, struct sw_flow_key *key, |
| u16 zone, struct sk_buff *skb) |
| { |
| struct ovs_skb_cb ovs_cb = *OVS_CB(skb); |
| |
| if (key->eth.type == htons(ETH_P_IP)) { |
| enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone; |
| int err; |
| |
| memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
| err = ip_defrag(skb, user); |
| if (err) |
| return err; |
| |
| ovs_cb.mru = IPCB(skb)->frag_max_size; |
| } else if (key->eth.type == htons(ETH_P_IPV6)) { |
| #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
| enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone; |
| struct sk_buff *reasm; |
| |
| memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); |
| reasm = nf_ct_frag6_gather(skb, user); |
| if (!reasm) |
| return -EINPROGRESS; |
| |
| if (skb == reasm) |
| return -EINVAL; |
| |
| key->ip.proto = ipv6_hdr(reasm)->nexthdr; |
| skb_morph(skb, reasm); |
| consume_skb(reasm); |
| ovs_cb.mru = IP6CB(skb)->frag_max_size; |
| #else |
| return -EPFNOSUPPORT; |
| #endif |
| } else { |
| return -EPFNOSUPPORT; |
| } |
| |
| key->ip.frag = OVS_FRAG_TYPE_NONE; |
| skb_clear_hash(skb); |
| skb->ignore_df = 1; |
| *OVS_CB(skb) = ovs_cb; |
| |
| return 0; |
| } |
| |
| static struct nf_conntrack_expect * |
| ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone, |
| u16 proto, const struct sk_buff *skb) |
| { |
| struct nf_conntrack_tuple tuple; |
| |
| if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, &tuple)) |
| return NULL; |
| return __nf_ct_expect_find(net, zone, &tuple); |
| } |
| |
| /* Determine whether skb->nfct is equal to the result of conntrack lookup. */ |
| static bool skb_nfct_cached(const struct net *net, const struct sk_buff *skb, |
| const struct ovs_conntrack_info *info) |
| { |
| enum ip_conntrack_info ctinfo; |
| struct nf_conn *ct; |
| |
| ct = nf_ct_get(skb, &ctinfo); |
| if (!ct) |
| return false; |
| if (!net_eq(net, read_pnet(&ct->ct_net))) |
| return false; |
| if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct))) |
| return false; |
| if (info->helper) { |
| struct nf_conn_help *help; |
| |
| help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER); |
| if (help && rcu_access_pointer(help->helper) != info->helper) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static int __ovs_ct_lookup(struct net *net, const struct sw_flow_key *key, |
| const struct ovs_conntrack_info *info, |
| struct sk_buff *skb) |
| { |
| /* If we are recirculating packets to match on conntrack fields and |
| * committing with a separate conntrack action, then we don't need to |
| * actually run the packet through conntrack twice unless it's for a |
| * different zone. |
| */ |
| if (!skb_nfct_cached(net, skb, info)) { |
| struct nf_conn *tmpl = info->ct; |
| |
| /* Associate skb with specified zone. */ |
| if (tmpl) { |
| if (skb->nfct) |
| nf_conntrack_put(skb->nfct); |
| nf_conntrack_get(&tmpl->ct_general); |
| skb->nfct = &tmpl->ct_general; |
| skb->nfctinfo = IP_CT_NEW; |
| } |
| |
| if (nf_conntrack_in(net, info->family, NF_INET_PRE_ROUTING, |
| skb) != NF_ACCEPT) |
| return -ENOENT; |
| |
| if (ovs_ct_helper(skb, info->family) != NF_ACCEPT) { |
| WARN_ONCE(1, "helper rejected packet"); |
| return -EINVAL; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* Lookup connection and read fields into key. */ |
| static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key, |
| const struct ovs_conntrack_info *info, |
| struct sk_buff *skb) |
| { |
| struct nf_conntrack_expect *exp; |
| |
| exp = ovs_ct_expect_find(net, &info->zone, info->family, skb); |
| if (exp) { |
| u8 state; |
| |
| state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED; |
| __ovs_ct_update_key(key, state, &info->zone, exp->master); |
| } else { |
| int err; |
| |
| err = __ovs_ct_lookup(net, key, info, skb); |
| if (err) |
| return err; |
| |
| ovs_ct_update_key(skb, key, true); |
| } |
| |
| return 0; |
| } |
| |
| /* Lookup connection and confirm if unconfirmed. */ |
| static int ovs_ct_commit(struct net *net, struct sw_flow_key *key, |
| const struct ovs_conntrack_info *info, |
| struct sk_buff *skb) |
| { |
| u8 state; |
| int err; |
| |
| state = key->ct.state; |
| if (key->ct.zone == info->zone.id && |
| ((state & OVS_CS_F_TRACKED) && !(state & OVS_CS_F_NEW))) { |
| /* Previous lookup has shown that this connection is already |
| * tracked and committed. Skip committing. |
| */ |
| return 0; |
| } |
| |
| err = __ovs_ct_lookup(net, key, info, skb); |
| if (err) |
| return err; |
| if (nf_conntrack_confirm(skb) != NF_ACCEPT) |
| return -EINVAL; |
| |
| ovs_ct_update_key(skb, key, true); |
| |
| return 0; |
| } |
| |
| static bool labels_nonzero(const struct ovs_key_ct_labels *labels) |
| { |
| size_t i; |
| |
| for (i = 0; i < sizeof(*labels); i++) |
| if (labels->ct_labels[i]) |
| return true; |
| |
| return false; |
| } |
| |
| int ovs_ct_execute(struct net *net, struct sk_buff *skb, |
| struct sw_flow_key *key, |
| const struct ovs_conntrack_info *info) |
| { |
| int nh_ofs; |
| int err; |
| |
| /* The conntrack module expects to be working at L3. */ |
| nh_ofs = skb_network_offset(skb); |
| skb_pull(skb, nh_ofs); |
| |
| if (key->ip.frag != OVS_FRAG_TYPE_NONE) { |
| err = handle_fragments(net, key, info->zone.id, skb); |
| if (err) |
| return err; |
| } |
| |
| if (info->flags & OVS_CT_F_COMMIT) |
| err = ovs_ct_commit(net, key, info, skb); |
| else |
| err = ovs_ct_lookup(net, key, info, skb); |
| if (err) |
| goto err; |
| |
| if (info->mark.mask) { |
| err = ovs_ct_set_mark(skb, key, info->mark.value, |
| info->mark.mask); |
| if (err) |
| goto err; |
| } |
| if (labels_nonzero(&info->labels.mask)) |
| err = ovs_ct_set_labels(skb, key, &info->labels.value, |
| &info->labels.mask); |
| err: |
| skb_push(skb, nh_ofs); |
| return err; |
| } |
| |
| static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name, |
| const struct sw_flow_key *key, bool log) |
| { |
| struct nf_conntrack_helper *helper; |
| struct nf_conn_help *help; |
| |
| helper = nf_conntrack_helper_try_module_get(name, info->family, |
| key->ip.proto); |
| if (!helper) { |
| OVS_NLERR(log, "Unknown helper \"%s\"", name); |
| return -EINVAL; |
| } |
| |
| help = nf_ct_helper_ext_add(info->ct, helper, GFP_KERNEL); |
| if (!help) { |
| module_put(helper->me); |
| return -ENOMEM; |
| } |
| |
| rcu_assign_pointer(help->helper, helper); |
| info->helper = helper; |
| return 0; |
| } |
| |
| static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = { |
| [OVS_CT_ATTR_FLAGS] = { .minlen = sizeof(u32), |
| .maxlen = sizeof(u32) }, |
| [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16), |
| .maxlen = sizeof(u16) }, |
| [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark), |
| .maxlen = sizeof(struct md_mark) }, |
| [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels), |
| .maxlen = sizeof(struct md_labels) }, |
| [OVS_CT_ATTR_HELPER] = { .minlen = 1, |
| .maxlen = NF_CT_HELPER_NAME_LEN } |
| }; |
| |
| static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info, |
| const char **helper, bool log) |
| { |
| struct nlattr *a; |
| int rem; |
| |
| nla_for_each_nested(a, attr, rem) { |
| int type = nla_type(a); |
| int maxlen = ovs_ct_attr_lens[type].maxlen; |
| int minlen = ovs_ct_attr_lens[type].minlen; |
| |
| if (type > OVS_CT_ATTR_MAX) { |
| OVS_NLERR(log, |
| "Unknown conntrack attr (type=%d, max=%d)", |
| type, OVS_CT_ATTR_MAX); |
| return -EINVAL; |
| } |
| if (nla_len(a) < minlen || nla_len(a) > maxlen) { |
| OVS_NLERR(log, |
| "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)", |
| type, nla_len(a), maxlen); |
| return -EINVAL; |
| } |
| |
| switch (type) { |
| case OVS_CT_ATTR_FLAGS: |
| info->flags = nla_get_u32(a); |
| break; |
| #ifdef CONFIG_NF_CONNTRACK_ZONES |
| case OVS_CT_ATTR_ZONE: |
| info->zone.id = nla_get_u16(a); |
| break; |
| #endif |
| #ifdef CONFIG_NF_CONNTRACK_MARK |
| case OVS_CT_ATTR_MARK: { |
| struct md_mark *mark = nla_data(a); |
| |
| info->mark = *mark; |
| break; |
| } |
| #endif |
| #ifdef CONFIG_NF_CONNTRACK_LABELS |
| case OVS_CT_ATTR_LABELS: { |
| struct md_labels *labels = nla_data(a); |
| |
| info->labels = *labels; |
| break; |
| } |
| #endif |
| case OVS_CT_ATTR_HELPER: |
| *helper = nla_data(a); |
| if (!memchr(*helper, '\0', nla_len(a))) { |
| OVS_NLERR(log, "Invalid conntrack helper"); |
| return -EINVAL; |
| } |
| break; |
| default: |
| OVS_NLERR(log, "Unknown conntrack attr (%d)", |
| type); |
| return -EINVAL; |
| } |
| } |
| |
| if (rem > 0) { |
| OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr) |
| { |
| if (attr == OVS_KEY_ATTR_CT_STATE) |
| return true; |
| if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && |
| attr == OVS_KEY_ATTR_CT_ZONE) |
| return true; |
| if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
| attr == OVS_KEY_ATTR_CT_MARK) |
| return true; |
| if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
| attr == OVS_KEY_ATTR_CT_LABELS) { |
| struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
| |
| return ovs_net->xt_label; |
| } |
| |
| return false; |
| } |
| |
| int ovs_ct_copy_action(struct net *net, const struct nlattr *attr, |
| const struct sw_flow_key *key, |
| struct sw_flow_actions **sfa, bool log) |
| { |
| struct ovs_conntrack_info ct_info; |
| const char *helper = NULL; |
| u16 family; |
| int err; |
| |
| family = key_to_nfproto(key); |
| if (family == NFPROTO_UNSPEC) { |
| OVS_NLERR(log, "ct family unspecified"); |
| return -EINVAL; |
| } |
| |
| memset(&ct_info, 0, sizeof(ct_info)); |
| ct_info.family = family; |
| |
| nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID, |
| NF_CT_DEFAULT_ZONE_DIR, 0); |
| |
| err = parse_ct(attr, &ct_info, &helper, log); |
| if (err) |
| return err; |
| |
| /* Set up template for tracking connections in specific zones. */ |
| ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL); |
| if (!ct_info.ct) { |
| OVS_NLERR(log, "Failed to allocate conntrack template"); |
| return -ENOMEM; |
| } |
| if (helper) { |
| err = ovs_ct_add_helper(&ct_info, helper, key, log); |
| if (err) |
| goto err_free_ct; |
| } |
| |
| err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info, |
| sizeof(ct_info), log); |
| if (err) |
| goto err_free_ct; |
| |
| __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status); |
| nf_conntrack_get(&ct_info.ct->ct_general); |
| return 0; |
| err_free_ct: |
| nf_conntrack_free(ct_info.ct); |
| return err; |
| } |
| |
| int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info, |
| struct sk_buff *skb) |
| { |
| struct nlattr *start; |
| |
| start = nla_nest_start(skb, OVS_ACTION_ATTR_CT); |
| if (!start) |
| return -EMSGSIZE; |
| |
| if (nla_put_u32(skb, OVS_CT_ATTR_FLAGS, ct_info->flags)) |
| return -EMSGSIZE; |
| if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && |
| nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id)) |
| return -EMSGSIZE; |
| if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
| nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark), |
| &ct_info->mark)) |
| return -EMSGSIZE; |
| if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
| nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels), |
| &ct_info->labels)) |
| return -EMSGSIZE; |
| if (ct_info->helper) { |
| if (nla_put_string(skb, OVS_CT_ATTR_HELPER, |
| ct_info->helper->name)) |
| return -EMSGSIZE; |
| } |
| |
| nla_nest_end(skb, start); |
| |
| return 0; |
| } |
| |
| void ovs_ct_free_action(const struct nlattr *a) |
| { |
| struct ovs_conntrack_info *ct_info = nla_data(a); |
| |
| if (ct_info->helper) |
| module_put(ct_info->helper->me); |
| if (ct_info->ct) |
| nf_ct_put(ct_info->ct); |
| } |
| |
| void ovs_ct_init(struct net *net) |
| { |
| unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE; |
| struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
| |
| if (nf_connlabels_get(net, n_bits)) { |
| ovs_net->xt_label = false; |
| OVS_NLERR(true, "Failed to set connlabel length"); |
| } else { |
| ovs_net->xt_label = true; |
| } |
| } |
| |
| void ovs_ct_exit(struct net *net) |
| { |
| struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
| |
| if (ovs_net->xt_label) |
| nf_connlabels_put(net); |
| } |