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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * This is a module which is used for queueing packets and communicating with
- * userspace via nfnetlink.
- *
- * (C) 2005 by Harald Welte <laforge@netfilter.org>
- * (C) 2007 by Patrick McHardy <kaber@trash.net>
- *
- * Based on the old ipv4-only ip_queue.c:
- * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
- * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/module.h>
- #include <linux/skbuff.h>
- #include <linux/init.h>
- #include <linux/spinlock.h>
- #include <linux/slab.h>
- #include <linux/notifier.h>
- #include <linux/netdevice.h>
- #include <linux/netfilter.h>
- #include <linux/proc_fs.h>
- #include <linux/netfilter_ipv4.h>
- #include <linux/netfilter_ipv6.h>
- #include <linux/netfilter_bridge.h>
- #include <linux/netfilter/nfnetlink.h>
- #include <linux/netfilter/nfnetlink_queue.h>
- #include <linux/netfilter/nf_conntrack_common.h>
- #include <linux/list.h>
- #include <net/sock.h>
- #include <net/tcp_states.h>
- #include <net/netfilter/nf_queue.h>
- #include <net/netns/generic.h>
- #include <linux/atomic.h>
- #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
- #include "../bridge/br_private.h"
- #endif
- #if IS_ENABLED(CONFIG_NF_CONNTRACK)
- #include <net/netfilter/nf_conntrack.h>
- #endif
- #define NFQNL_QMAX_DEFAULT 1024
- /* We're using struct nlattr which has 16bit nla_len. Note that nla_len
- * includes the header length. Thus, the maximum packet length that we
- * support is 65531 bytes. We send truncated packets if the specified length
- * is larger than that. Userspace can check for presence of NFQA_CAP_LEN
- * attribute to detect truncation.
- */
- #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
- struct nfqnl_instance {
- struct hlist_node hlist; /* global list of queues */
- struct rcu_head rcu;
- u32 peer_portid;
- unsigned int queue_maxlen;
- unsigned int copy_range;
- unsigned int queue_dropped;
- unsigned int queue_user_dropped;
- u_int16_t queue_num; /* number of this queue */
- u_int8_t copy_mode;
- u_int32_t flags; /* Set using NFQA_CFG_FLAGS */
- /*
- * Following fields are dirtied for each queued packet,
- * keep them in same cache line if possible.
- */
- spinlock_t lock ____cacheline_aligned_in_smp;
- unsigned int queue_total;
- unsigned int id_sequence; /* 'sequence' of pkt ids */
- struct list_head queue_list; /* packets in queue */
- };
- typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
- static unsigned int nfnl_queue_net_id __read_mostly;
- #define INSTANCE_BUCKETS 16
- struct nfnl_queue_net {
- spinlock_t instances_lock;
- struct hlist_head instance_table[INSTANCE_BUCKETS];
- };
- static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
- {
- return net_generic(net, nfnl_queue_net_id);
- }
- static inline u_int8_t instance_hashfn(u_int16_t queue_num)
- {
- return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
- }
- static struct nfqnl_instance *
- instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num)
- {
- struct hlist_head *head;
- struct nfqnl_instance *inst;
- head = &q->instance_table[instance_hashfn(queue_num)];
- hlist_for_each_entry_rcu(inst, head, hlist) {
- if (inst->queue_num == queue_num)
- return inst;
- }
- return NULL;
- }
- static struct nfqnl_instance *
- instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid)
- {
- struct nfqnl_instance *inst;
- unsigned int h;
- int err;
- spin_lock(&q->instances_lock);
- if (instance_lookup(q, queue_num)) {
- err = -EEXIST;
- goto out_unlock;
- }
- inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
- if (!inst) {
- err = -ENOMEM;
- goto out_unlock;
- }
- inst->queue_num = queue_num;
- inst->peer_portid = portid;
- inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
- inst->copy_range = NFQNL_MAX_COPY_RANGE;
- inst->copy_mode = NFQNL_COPY_NONE;
- spin_lock_init(&inst->lock);
- INIT_LIST_HEAD(&inst->queue_list);
- if (!try_module_get(THIS_MODULE)) {
- err = -EAGAIN;
- goto out_free;
- }
- h = instance_hashfn(queue_num);
- hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]);
- spin_unlock(&q->instances_lock);
- return inst;
- out_free:
- kfree(inst);
- out_unlock:
- spin_unlock(&q->instances_lock);
- return ERR_PTR(err);
- }
- static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
- unsigned long data);
- static void
- instance_destroy_rcu(struct rcu_head *head)
- {
- struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
- rcu);
- nfqnl_flush(inst, NULL, 0);
- kfree(inst);
- module_put(THIS_MODULE);
- }
- static void
- __instance_destroy(struct nfqnl_instance *inst)
- {
- hlist_del_rcu(&inst->hlist);
- call_rcu(&inst->rcu, instance_destroy_rcu);
- }
- static void
- instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst)
- {
- spin_lock(&q->instances_lock);
- __instance_destroy(inst);
- spin_unlock(&q->instances_lock);
- }
- static inline void
- __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
- {
- list_add_tail(&entry->list, &queue->queue_list);
- queue->queue_total++;
- }
- static void
- __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
- {
- list_del(&entry->list);
- queue->queue_total--;
- }
- static struct nf_queue_entry *
- find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
- {
- struct nf_queue_entry *entry = NULL, *i;
- spin_lock_bh(&queue->lock);
- list_for_each_entry(i, &queue->queue_list, list) {
- if (i->id == id) {
- entry = i;
- break;
- }
- }
- if (entry)
- __dequeue_entry(queue, entry);
- spin_unlock_bh(&queue->lock);
- return entry;
- }
- static void nfqnl_reinject(struct nf_queue_entry *entry, unsigned int verdict)
- {
- struct nf_ct_hook *ct_hook;
- int err;
- if (verdict == NF_ACCEPT ||
- verdict == NF_REPEAT ||
- verdict == NF_STOP) {
- rcu_read_lock();
- ct_hook = rcu_dereference(nf_ct_hook);
- if (ct_hook) {
- err = ct_hook->update(entry->state.net, entry->skb);
- if (err < 0)
- verdict = NF_DROP;
- }
- rcu_read_unlock();
- }
- nf_reinject(entry, verdict);
- }
- static void
- nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
- {
- struct nf_queue_entry *entry, *next;
- spin_lock_bh(&queue->lock);
- list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
- if (!cmpfn || cmpfn(entry, data)) {
- list_del(&entry->list);
- queue->queue_total--;
- nfqnl_reinject(entry, NF_DROP);
- }
- }
- spin_unlock_bh(&queue->lock);
- }
- static int
- nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet,
- bool csum_verify)
- {
- __u32 flags = 0;
- if (packet->ip_summed == CHECKSUM_PARTIAL)
- flags = NFQA_SKB_CSUMNOTREADY;
- else if (csum_verify)
- flags = NFQA_SKB_CSUM_NOTVERIFIED;
- if (skb_is_gso(packet))
- flags |= NFQA_SKB_GSO;
- return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0;
- }
- static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk)
- {
- const struct cred *cred;
- if (!sk_fullsock(sk))
- return 0;
- read_lock_bh(&sk->sk_callback_lock);
- if (sk->sk_socket && sk->sk_socket->file) {
- cred = sk->sk_socket->file->f_cred;
- if (nla_put_be32(skb, NFQA_UID,
- htonl(from_kuid_munged(&init_user_ns, cred->fsuid))))
- goto nla_put_failure;
- if (nla_put_be32(skb, NFQA_GID,
- htonl(from_kgid_munged(&init_user_ns, cred->fsgid))))
- goto nla_put_failure;
- }
- read_unlock_bh(&sk->sk_callback_lock);
- return 0;
- nla_put_failure:
- read_unlock_bh(&sk->sk_callback_lock);
- return -1;
- }
- static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
- {
- u32 seclen = 0;
- #if IS_ENABLED(CONFIG_NETWORK_SECMARK)
- if (!skb || !sk_fullsock(skb->sk))
- return 0;
- read_lock_bh(&skb->sk->sk_callback_lock);
- if (skb->secmark)
- security_secid_to_secctx(skb->secmark, secdata, &seclen);
- read_unlock_bh(&skb->sk->sk_callback_lock);
- #endif
- return seclen;
- }
- static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry)
- {
- struct sk_buff *entskb = entry->skb;
- u32 nlalen = 0;
- if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb))
- return 0;
- if (skb_vlan_tag_present(entskb))
- nlalen += nla_total_size(nla_total_size(sizeof(__be16)) +
- nla_total_size(sizeof(__be16)));
- if (entskb->network_header > entskb->mac_header)
- nlalen += nla_total_size((entskb->network_header -
- entskb->mac_header));
- return nlalen;
- }
- static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb)
- {
- struct sk_buff *entskb = entry->skb;
- if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb))
- return 0;
- if (skb_vlan_tag_present(entskb)) {
- struct nlattr *nest;
- nest = nla_nest_start(skb, NFQA_VLAN);
- if (!nest)
- goto nla_put_failure;
- if (nla_put_be16(skb, NFQA_VLAN_TCI, htons(entskb->vlan_tci)) ||
- nla_put_be16(skb, NFQA_VLAN_PROTO, entskb->vlan_proto))
- goto nla_put_failure;
- nla_nest_end(skb, nest);
- }
- if (entskb->mac_header < entskb->network_header) {
- int len = (int)(entskb->network_header - entskb->mac_header);
- if (nla_put(skb, NFQA_L2HDR, len, skb_mac_header(entskb)))
- goto nla_put_failure;
- }
- return 0;
- nla_put_failure:
- return -1;
- }
- static struct sk_buff *
- nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
- struct nf_queue_entry *entry,
- __be32 **packet_id_ptr)
- {
- size_t size;
- size_t data_len = 0, cap_len = 0;
- unsigned int hlen = 0;
- struct sk_buff *skb;
- struct nlattr *nla;
- struct nfqnl_msg_packet_hdr *pmsg;
- struct nlmsghdr *nlh;
- struct nfgenmsg *nfmsg;
- struct sk_buff *entskb = entry->skb;
- struct net_device *indev;
- struct net_device *outdev;
- struct nf_conn *ct = NULL;
- enum ip_conntrack_info ctinfo;
- struct nfnl_ct_hook *nfnl_ct;
- bool csum_verify;
- char *secdata = NULL;
- u32 seclen = 0;
- size = nlmsg_total_size(sizeof(struct nfgenmsg))
- + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
- + nla_total_size(sizeof(u_int32_t)) /* ifindex */
- + nla_total_size(sizeof(u_int32_t)) /* ifindex */
- #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
- + nla_total_size(sizeof(u_int32_t)) /* ifindex */
- + nla_total_size(sizeof(u_int32_t)) /* ifindex */
- #endif
- + nla_total_size(sizeof(u_int32_t)) /* mark */
- + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
- + nla_total_size(sizeof(u_int32_t)) /* skbinfo */
- + nla_total_size(sizeof(u_int32_t)); /* cap_len */
- if (entskb->tstamp)
- size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
- size += nfqnl_get_bridge_size(entry);
- if (entry->state.hook <= NF_INET_FORWARD ||
- (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
- csum_verify = !skb_csum_unnecessary(entskb);
- else
- csum_verify = false;
- outdev = entry->state.out;
- switch ((enum nfqnl_config_mode)READ_ONCE(queue->copy_mode)) {
- case NFQNL_COPY_META:
- case NFQNL_COPY_NONE:
- break;
- case NFQNL_COPY_PACKET:
- if (!(queue->flags & NFQA_CFG_F_GSO) &&
- entskb->ip_summed == CHECKSUM_PARTIAL &&
- skb_checksum_help(entskb))
- return NULL;
- data_len = READ_ONCE(queue->copy_range);
- if (data_len > entskb->len)
- data_len = entskb->len;
- hlen = skb_zerocopy_headlen(entskb);
- hlen = min_t(unsigned int, hlen, data_len);
- size += sizeof(struct nlattr) + hlen;
- cap_len = entskb->len;
- break;
- }
- nfnl_ct = rcu_dereference(nfnl_ct_hook);
- if (queue->flags & NFQA_CFG_F_CONNTRACK) {
- if (nfnl_ct != NULL) {
- ct = nfnl_ct->get_ct(entskb, &ctinfo);
- if (ct != NULL)
- size += nfnl_ct->build_size(ct);
- }
- }
- if (queue->flags & NFQA_CFG_F_UID_GID) {
- size += (nla_total_size(sizeof(u_int32_t)) /* uid */
- + nla_total_size(sizeof(u_int32_t))); /* gid */
- }
- if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) {
- seclen = nfqnl_get_sk_secctx(entskb, &secdata);
- if (seclen)
- size += nla_total_size(seclen);
- }
- skb = alloc_skb(size, GFP_ATOMIC);
- if (!skb) {
- skb_tx_error(entskb);
- goto nlmsg_failure;
- }
- nlh = nlmsg_put(skb, 0, 0,
- nfnl_msg_type(NFNL_SUBSYS_QUEUE, NFQNL_MSG_PACKET),
- sizeof(struct nfgenmsg), 0);
- if (!nlh) {
- skb_tx_error(entskb);
- kfree_skb(skb);
- goto nlmsg_failure;
- }
- nfmsg = nlmsg_data(nlh);
- nfmsg->nfgen_family = entry->state.pf;
- nfmsg->version = NFNETLINK_V0;
- nfmsg->res_id = htons(queue->queue_num);
- nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
- pmsg = nla_data(nla);
- pmsg->hw_protocol = entskb->protocol;
- pmsg->hook = entry->state.hook;
- *packet_id_ptr = &pmsg->packet_id;
- indev = entry->state.in;
- if (indev) {
- #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
- if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
- goto nla_put_failure;
- #else
- if (entry->state.pf == PF_BRIDGE) {
- /* Case 1: indev is physical input device, we need to
- * look for bridge group (when called from
- * netfilter_bridge) */
- if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
- htonl(indev->ifindex)) ||
- /* this is the bridge group "brX" */
- /* rcu_read_lock()ed by __nf_queue */
- nla_put_be32(skb, NFQA_IFINDEX_INDEV,
- htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
- goto nla_put_failure;
- } else {
- int physinif;
- /* Case 2: indev is bridge group, we need to look for
- * physical device (when called from ipv4) */
- if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
- htonl(indev->ifindex)))
- goto nla_put_failure;
- physinif = nf_bridge_get_physinif(entskb);
- if (physinif &&
- nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
- htonl(physinif)))
- goto nla_put_failure;
- }
- #endif
- }
- if (outdev) {
- #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
- if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
- goto nla_put_failure;
- #else
- if (entry->state.pf == PF_BRIDGE) {
- /* Case 1: outdev is physical output device, we need to
- * look for bridge group (when called from
- * netfilter_bridge) */
- if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
- htonl(outdev->ifindex)) ||
- /* this is the bridge group "brX" */
- /* rcu_read_lock()ed by __nf_queue */
- nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
- htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
- goto nla_put_failure;
- } else {
- int physoutif;
- /* Case 2: outdev is bridge group, we need to look for
- * physical output device (when called from ipv4) */
- if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
- htonl(outdev->ifindex)))
- goto nla_put_failure;
- physoutif = nf_bridge_get_physoutif(entskb);
- if (physoutif &&
- nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
- htonl(physoutif)))
- goto nla_put_failure;
- }
- #endif
- }
- if (entskb->mark &&
- nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
- goto nla_put_failure;
- if (indev && entskb->dev &&
- skb_mac_header_was_set(entskb) &&
- skb_mac_header_len(entskb) != 0) {
- struct nfqnl_msg_packet_hw phw;
- int len;
- memset(&phw, 0, sizeof(phw));
- len = dev_parse_header(entskb, phw.hw_addr);
- if (len) {
- phw.hw_addrlen = htons(len);
- if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
- goto nla_put_failure;
- }
- }
- if (nfqnl_put_bridge(entry, skb) < 0)
- goto nla_put_failure;
- if (entry->state.hook <= NF_INET_FORWARD && entskb->tstamp) {
- struct nfqnl_msg_packet_timestamp ts;
- struct timespec64 kts = ktime_to_timespec64(entskb->tstamp);
- ts.sec = cpu_to_be64(kts.tv_sec);
- ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC);
- if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
- goto nla_put_failure;
- }
- if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk &&
- nfqnl_put_sk_uidgid(skb, entskb->sk) < 0)
- goto nla_put_failure;
- if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata))
- goto nla_put_failure;
- if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0)
- goto nla_put_failure;
- if (cap_len > data_len &&
- nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
- goto nla_put_failure;
- if (nfqnl_put_packet_info(skb, entskb, csum_verify))
- goto nla_put_failure;
- if (data_len) {
- struct nlattr *nla;
- if (skb_tailroom(skb) < sizeof(*nla) + hlen)
- goto nla_put_failure;
- nla = skb_put(skb, sizeof(*nla));
- nla->nla_type = NFQA_PAYLOAD;
- nla->nla_len = nla_attr_size(data_len);
- if (skb_zerocopy(skb, entskb, data_len, hlen))
- goto nla_put_failure;
- }
- nlh->nlmsg_len = skb->len;
- if (seclen)
- security_release_secctx(secdata, seclen);
- return skb;
- nla_put_failure:
- skb_tx_error(entskb);
- kfree_skb(skb);
- net_err_ratelimited("nf_queue: error creating packet message\n");
- nlmsg_failure:
- if (seclen)
- security_release_secctx(secdata, seclen);
- return NULL;
- }
- static bool nf_ct_drop_unconfirmed(const struct nf_queue_entry *entry)
- {
- #if IS_ENABLED(CONFIG_NF_CONNTRACK)
- static const unsigned long flags = IPS_CONFIRMED | IPS_DYING;
- const struct nf_conn *ct = (void *)skb_nfct(entry->skb);
- if (ct && ((ct->status & flags) == IPS_DYING))
- return true;
- #endif
- return false;
- }
- static int
- __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
- struct nf_queue_entry *entry)
- {
- struct sk_buff *nskb;
- int err = -ENOBUFS;
- __be32 *packet_id_ptr;
- int failopen = 0;
- nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr);
- if (nskb == NULL) {
- err = -ENOMEM;
- goto err_out;
- }
- spin_lock_bh(&queue->lock);
- if (nf_ct_drop_unconfirmed(entry))
- goto err_out_free_nskb;
- if (queue->queue_total >= queue->queue_maxlen) {
- if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
- failopen = 1;
- err = 0;
- } else {
- queue->queue_dropped++;
- net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
- queue->queue_total);
- }
- goto err_out_free_nskb;
- }
- entry->id = ++queue->id_sequence;
- *packet_id_ptr = htonl(entry->id);
- /* nfnetlink_unicast will either free the nskb or add it to a socket */
- err = nfnetlink_unicast(nskb, net, queue->peer_portid);
- if (err < 0) {
- if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
- failopen = 1;
- err = 0;
- } else {
- queue->queue_user_dropped++;
- }
- goto err_out_unlock;
- }
- __enqueue_entry(queue, entry);
- spin_unlock_bh(&queue->lock);
- return 0;
- err_out_free_nskb:
- kfree_skb(nskb);
- err_out_unlock:
- spin_unlock_bh(&queue->lock);
- if (failopen)
- nfqnl_reinject(entry, NF_ACCEPT);
- err_out:
- return err;
- }
- static struct nf_queue_entry *
- nf_queue_entry_dup(struct nf_queue_entry *e)
- {
- struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
- if (!entry)
- return NULL;
- if (nf_queue_entry_get_refs(entry))
- return entry;
- kfree(entry);
- return NULL;
- }
- #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
- /* When called from bridge netfilter, skb->data must point to MAC header
- * before calling skb_gso_segment(). Else, original MAC header is lost
- * and segmented skbs will be sent to wrong destination.
- */
- static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
- {
- if (nf_bridge_info_get(skb))
- __skb_push(skb, skb->network_header - skb->mac_header);
- }
- static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
- {
- if (nf_bridge_info_get(skb))
- __skb_pull(skb, skb->network_header - skb->mac_header);
- }
- #else
- #define nf_bridge_adjust_skb_data(s) do {} while (0)
- #define nf_bridge_adjust_segmented_data(s) do {} while (0)
- #endif
- static int
- __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
- struct sk_buff *skb, struct nf_queue_entry *entry)
- {
- int ret = -ENOMEM;
- struct nf_queue_entry *entry_seg;
- nf_bridge_adjust_segmented_data(skb);
- if (skb->next == NULL) { /* last packet, no need to copy entry */
- struct sk_buff *gso_skb = entry->skb;
- entry->skb = skb;
- ret = __nfqnl_enqueue_packet(net, queue, entry);
- if (ret)
- entry->skb = gso_skb;
- return ret;
- }
- skb_mark_not_on_list(skb);
- entry_seg = nf_queue_entry_dup(entry);
- if (entry_seg) {
- entry_seg->skb = skb;
- ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
- if (ret)
- nf_queue_entry_free(entry_seg);
- }
- return ret;
- }
- static int
- nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
- {
- unsigned int queued;
- struct nfqnl_instance *queue;
- struct sk_buff *skb, *segs, *nskb;
- int err = -ENOBUFS;
- struct net *net = entry->state.net;
- struct nfnl_queue_net *q = nfnl_queue_pernet(net);
- /* rcu_read_lock()ed by nf_hook_thresh */
- queue = instance_lookup(q, queuenum);
- if (!queue)
- return -ESRCH;
- if (queue->copy_mode == NFQNL_COPY_NONE)
- return -EINVAL;
- skb = entry->skb;
- switch (entry->state.pf) {
- case NFPROTO_IPV4:
- skb->protocol = htons(ETH_P_IP);
- break;
- case NFPROTO_IPV6:
- skb->protocol = htons(ETH_P_IPV6);
- break;
- }
- if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
- return __nfqnl_enqueue_packet(net, queue, entry);
- nf_bridge_adjust_skb_data(skb);
- segs = skb_gso_segment(skb, 0);
- /* Does not use PTR_ERR to limit the number of error codes that can be
- * returned by nf_queue. For instance, callers rely on -ESRCH to
- * mean 'ignore this hook'.
- */
- if (IS_ERR_OR_NULL(segs))
- goto out_err;
- queued = 0;
- err = 0;
- skb_list_walk_safe(segs, segs, nskb) {
- if (err == 0)
- err = __nfqnl_enqueue_packet_gso(net, queue,
- segs, entry);
- if (err == 0)
- queued++;
- else
- kfree_skb(segs);
- }
- if (queued) {
- if (err) /* some segments are already queued */
- nf_queue_entry_free(entry);
- kfree_skb(skb);
- return 0;
- }
- out_err:
- nf_bridge_adjust_segmented_data(skb);
- return err;
- }
- static int
- nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
- {
- struct sk_buff *nskb;
- if (diff < 0) {
- if (pskb_trim(e->skb, data_len))
- return -ENOMEM;
- } else if (diff > 0) {
- if (data_len > 0xFFFF)
- return -EINVAL;
- if (diff > skb_tailroom(e->skb)) {
- nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
- diff, GFP_ATOMIC);
- if (!nskb)
- return -ENOMEM;
- kfree_skb(e->skb);
- e->skb = nskb;
- }
- skb_put(e->skb, diff);
- }
- if (skb_ensure_writable(e->skb, data_len))
- return -ENOMEM;
- skb_copy_to_linear_data(e->skb, data, data_len);
- e->skb->ip_summed = CHECKSUM_NONE;
- return 0;
- }
- static int
- nfqnl_set_mode(struct nfqnl_instance *queue,
- unsigned char mode, unsigned int range)
- {
- int status = 0;
- spin_lock_bh(&queue->lock);
- switch (mode) {
- case NFQNL_COPY_NONE:
- case NFQNL_COPY_META:
- queue->copy_mode = mode;
- queue->copy_range = 0;
- break;
- case NFQNL_COPY_PACKET:
- queue->copy_mode = mode;
- if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
- queue->copy_range = NFQNL_MAX_COPY_RANGE;
- else
- queue->copy_range = range;
- break;
- default:
- status = -EINVAL;
- }
- spin_unlock_bh(&queue->lock);
- return status;
- }
- static int
- dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
- {
- #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
- int physinif, physoutif;
- physinif = nf_bridge_get_physinif(entry->skb);
- physoutif = nf_bridge_get_physoutif(entry->skb);
- if (physinif == ifindex || physoutif == ifindex)
- return 1;
- #endif
- if (entry->state.in)
- if (entry->state.in->ifindex == ifindex)
- return 1;
- if (entry->state.out)
- if (entry->state.out->ifindex == ifindex)
- return 1;
- return 0;
- }
- /* drop all packets with either indev or outdev == ifindex from all queue
- * instances */
- static void
- nfqnl_dev_drop(struct net *net, int ifindex)
- {
- int i;
- struct nfnl_queue_net *q = nfnl_queue_pernet(net);
- rcu_read_lock();
- for (i = 0; i < INSTANCE_BUCKETS; i++) {
- struct nfqnl_instance *inst;
- struct hlist_head *head = &q->instance_table[i];
- hlist_for_each_entry_rcu(inst, head, hlist)
- nfqnl_flush(inst, dev_cmp, ifindex);
- }
- rcu_read_unlock();
- }
- static int
- nfqnl_rcv_dev_event(struct notifier_block *this,
- unsigned long event, void *ptr)
- {
- struct net_device *dev = netdev_notifier_info_to_dev(ptr);
- /* Drop any packets associated with the downed device */
- if (event == NETDEV_DOWN)
- nfqnl_dev_drop(dev_net(dev), dev->ifindex);
- return NOTIFY_DONE;
- }
- static struct notifier_block nfqnl_dev_notifier = {
- .notifier_call = nfqnl_rcv_dev_event,
- };
- static void nfqnl_nf_hook_drop(struct net *net)
- {
- struct nfnl_queue_net *q = nfnl_queue_pernet(net);
- int i;
- for (i = 0; i < INSTANCE_BUCKETS; i++) {
- struct nfqnl_instance *inst;
- struct hlist_head *head = &q->instance_table[i];
- hlist_for_each_entry_rcu(inst, head, hlist)
- nfqnl_flush(inst, NULL, 0);
- }
- }
- static int
- nfqnl_rcv_nl_event(struct notifier_block *this,
- unsigned long event, void *ptr)
- {
- struct netlink_notify *n = ptr;
- struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
- if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
- int i;
- /* destroy all instances for this portid */
- spin_lock(&q->instances_lock);
- for (i = 0; i < INSTANCE_BUCKETS; i++) {
- struct hlist_node *t2;
- struct nfqnl_instance *inst;
- struct hlist_head *head = &q->instance_table[i];
- hlist_for_each_entry_safe(inst, t2, head, hlist) {
- if (n->portid == inst->peer_portid)
- __instance_destroy(inst);
- }
- }
- spin_unlock(&q->instances_lock);
- }
- return NOTIFY_DONE;
- }
- static struct notifier_block nfqnl_rtnl_notifier = {
- .notifier_call = nfqnl_rcv_nl_event,
- };
- static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = {
- [NFQA_VLAN_TCI] = { .type = NLA_U16},
- [NFQA_VLAN_PROTO] = { .type = NLA_U16},
- };
- static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
- [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
- [NFQA_MARK] = { .type = NLA_U32 },
- [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
- [NFQA_CT] = { .type = NLA_UNSPEC },
- [NFQA_EXP] = { .type = NLA_UNSPEC },
- [NFQA_VLAN] = { .type = NLA_NESTED },
- };
- static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
- [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
- [NFQA_MARK] = { .type = NLA_U32 },
- };
- static struct nfqnl_instance *
- verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid)
- {
- struct nfqnl_instance *queue;
- queue = instance_lookup(q, queue_num);
- if (!queue)
- return ERR_PTR(-ENODEV);
- if (queue->peer_portid != nlportid)
- return ERR_PTR(-EPERM);
- return queue;
- }
- static struct nfqnl_msg_verdict_hdr*
- verdicthdr_get(const struct nlattr * const nfqa[])
- {
- struct nfqnl_msg_verdict_hdr *vhdr;
- unsigned int verdict;
- if (!nfqa[NFQA_VERDICT_HDR])
- return NULL;
- vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
- verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
- if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
- return NULL;
- return vhdr;
- }
- static int nfq_id_after(unsigned int id, unsigned int max)
- {
- return (int)(id - max) > 0;
- }
- static int nfqnl_recv_verdict_batch(struct net *net, struct sock *ctnl,
- struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const nfqa[],
- struct netlink_ext_ack *extack)
- {
- struct nfgenmsg *nfmsg = nlmsg_data(nlh);
- struct nf_queue_entry *entry, *tmp;
- unsigned int verdict, maxid;
- struct nfqnl_msg_verdict_hdr *vhdr;
- struct nfqnl_instance *queue;
- LIST_HEAD(batch_list);
- u16 queue_num = ntohs(nfmsg->res_id);
- struct nfnl_queue_net *q = nfnl_queue_pernet(net);
- queue = verdict_instance_lookup(q, queue_num,
- NETLINK_CB(skb).portid);
- if (IS_ERR(queue))
- return PTR_ERR(queue);
- vhdr = verdicthdr_get(nfqa);
- if (!vhdr)
- return -EINVAL;
- verdict = ntohl(vhdr->verdict);
- maxid = ntohl(vhdr->id);
- spin_lock_bh(&queue->lock);
- list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
- if (nfq_id_after(entry->id, maxid))
- break;
- __dequeue_entry(queue, entry);
- list_add_tail(&entry->list, &batch_list);
- }
- spin_unlock_bh(&queue->lock);
- if (list_empty(&batch_list))
- return -ENOENT;
- list_for_each_entry_safe(entry, tmp, &batch_list, list) {
- if (nfqa[NFQA_MARK])
- entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
- nfqnl_reinject(entry, verdict);
- }
- return 0;
- }
- static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct,
- const struct nlmsghdr *nlh,
- const struct nlattr * const nfqa[],
- struct nf_queue_entry *entry,
- enum ip_conntrack_info *ctinfo)
- {
- struct nf_conn *ct;
- ct = nfnl_ct->get_ct(entry->skb, ctinfo);
- if (ct == NULL)
- return NULL;
- if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0)
- return NULL;
- if (nfqa[NFQA_EXP])
- nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct,
- NETLINK_CB(entry->skb).portid,
- nlmsg_report(nlh));
- return ct;
- }
- static int nfqa_parse_bridge(struct nf_queue_entry *entry,
- const struct nlattr * const nfqa[])
- {
- if (nfqa[NFQA_VLAN]) {
- struct nlattr *tb[NFQA_VLAN_MAX + 1];
- int err;
- err = nla_parse_nested_deprecated(tb, NFQA_VLAN_MAX,
- nfqa[NFQA_VLAN],
- nfqa_vlan_policy, NULL);
- if (err < 0)
- return err;
- if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO])
- return -EINVAL;
- __vlan_hwaccel_put_tag(entry->skb,
- nla_get_be16(tb[NFQA_VLAN_PROTO]),
- ntohs(nla_get_be16(tb[NFQA_VLAN_TCI])));
- }
- if (nfqa[NFQA_L2HDR]) {
- int mac_header_len = entry->skb->network_header -
- entry->skb->mac_header;
- if (mac_header_len != nla_len(nfqa[NFQA_L2HDR]))
- return -EINVAL;
- else if (mac_header_len > 0)
- memcpy(skb_mac_header(entry->skb),
- nla_data(nfqa[NFQA_L2HDR]),
- mac_header_len);
- }
- return 0;
- }
- static int nfqnl_recv_verdict(struct net *net, struct sock *ctnl,
- struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const nfqa[],
- struct netlink_ext_ack *extack)
- {
- struct nfgenmsg *nfmsg = nlmsg_data(nlh);
- u_int16_t queue_num = ntohs(nfmsg->res_id);
- struct nfqnl_msg_verdict_hdr *vhdr;
- struct nfqnl_instance *queue;
- unsigned int verdict;
- struct nf_queue_entry *entry;
- enum ip_conntrack_info ctinfo;
- struct nfnl_ct_hook *nfnl_ct;
- struct nf_conn *ct = NULL;
- struct nfnl_queue_net *q = nfnl_queue_pernet(net);
- int err;
- queue = verdict_instance_lookup(q, queue_num,
- NETLINK_CB(skb).portid);
- if (IS_ERR(queue))
- return PTR_ERR(queue);
- vhdr = verdicthdr_get(nfqa);
- if (!vhdr)
- return -EINVAL;
- verdict = ntohl(vhdr->verdict);
- entry = find_dequeue_entry(queue, ntohl(vhdr->id));
- if (entry == NULL)
- return -ENOENT;
- /* rcu lock already held from nfnl->call_rcu. */
- nfnl_ct = rcu_dereference(nfnl_ct_hook);
- if (nfqa[NFQA_CT]) {
- if (nfnl_ct != NULL)
- ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo);
- }
- if (entry->state.pf == PF_BRIDGE) {
- err = nfqa_parse_bridge(entry, nfqa);
- if (err < 0)
- return err;
- }
- if (nfqa[NFQA_PAYLOAD]) {
- u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
- int diff = payload_len - entry->skb->len;
- if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
- payload_len, entry, diff) < 0)
- verdict = NF_DROP;
- if (ct && diff)
- nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff);
- }
- if (nfqa[NFQA_MARK])
- entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
- nfqnl_reinject(entry, verdict);
- return 0;
- }
- static int nfqnl_recv_unsupp(struct net *net, struct sock *ctnl,
- struct sk_buff *skb, const struct nlmsghdr *nlh,
- const struct nlattr * const nfqa[],
- struct netlink_ext_ack *extack)
- {
- return -ENOTSUPP;
- }
- static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
- [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
- [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
- [NFQA_CFG_QUEUE_MAXLEN] = { .type = NLA_U32 },
- [NFQA_CFG_MASK] = { .type = NLA_U32 },
- [NFQA_CFG_FLAGS] = { .type = NLA_U32 },
- };
- static const struct nf_queue_handler nfqh = {
- .outfn = nfqnl_enqueue_packet,
- .nf_hook_drop = nfqnl_nf_hook_drop,
- };
- static int nfqnl_recv_config(struct net *net, struct sock *ctnl,
- struct sk_buff *skb, const struct nlmsghdr *nlh,
- const struct nlattr * const nfqa[],
- struct netlink_ext_ack *extack)
- {
- struct nfgenmsg *nfmsg = nlmsg_data(nlh);
- u_int16_t queue_num = ntohs(nfmsg->res_id);
- struct nfqnl_instance *queue;
- struct nfqnl_msg_config_cmd *cmd = NULL;
- struct nfnl_queue_net *q = nfnl_queue_pernet(net);
- __u32 flags = 0, mask = 0;
- int ret = 0;
- if (nfqa[NFQA_CFG_CMD]) {
- cmd = nla_data(nfqa[NFQA_CFG_CMD]);
- /* Obsolete commands without queue context */
- switch (cmd->command) {
- case NFQNL_CFG_CMD_PF_BIND: return 0;
- case NFQNL_CFG_CMD_PF_UNBIND: return 0;
- }
- }
- /* Check if we support these flags in first place, dependencies should
- * be there too not to break atomicity.
- */
- if (nfqa[NFQA_CFG_FLAGS]) {
- if (!nfqa[NFQA_CFG_MASK]) {
- /* A mask is needed to specify which flags are being
- * changed.
- */
- return -EINVAL;
- }
- flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
- mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
- if (flags >= NFQA_CFG_F_MAX)
- return -EOPNOTSUPP;
- #if !IS_ENABLED(CONFIG_NETWORK_SECMARK)
- if (flags & mask & NFQA_CFG_F_SECCTX)
- return -EOPNOTSUPP;
- #endif
- if ((flags & mask & NFQA_CFG_F_CONNTRACK) &&
- !rcu_access_pointer(nfnl_ct_hook)) {
- #ifdef CONFIG_MODULES
- nfnl_unlock(NFNL_SUBSYS_QUEUE);
- request_module("ip_conntrack_netlink");
- nfnl_lock(NFNL_SUBSYS_QUEUE);
- if (rcu_access_pointer(nfnl_ct_hook))
- return -EAGAIN;
- #endif
- return -EOPNOTSUPP;
- }
- }
- rcu_read_lock();
- queue = instance_lookup(q, queue_num);
- if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
- ret = -EPERM;
- goto err_out_unlock;
- }
- if (cmd != NULL) {
- switch (cmd->command) {
- case NFQNL_CFG_CMD_BIND:
- if (queue) {
- ret = -EBUSY;
- goto err_out_unlock;
- }
- queue = instance_create(q, queue_num,
- NETLINK_CB(skb).portid);
- if (IS_ERR(queue)) {
- ret = PTR_ERR(queue);
- goto err_out_unlock;
- }
- break;
- case NFQNL_CFG_CMD_UNBIND:
- if (!queue) {
- ret = -ENODEV;
- goto err_out_unlock;
- }
- instance_destroy(q, queue);
- goto err_out_unlock;
- case NFQNL_CFG_CMD_PF_BIND:
- case NFQNL_CFG_CMD_PF_UNBIND:
- break;
- default:
- ret = -ENOTSUPP;
- goto err_out_unlock;
- }
- }
- if (!queue) {
- ret = -ENODEV;
- goto err_out_unlock;
- }
- if (nfqa[NFQA_CFG_PARAMS]) {
- struct nfqnl_msg_config_params *params =
- nla_data(nfqa[NFQA_CFG_PARAMS]);
- nfqnl_set_mode(queue, params->copy_mode,
- ntohl(params->copy_range));
- }
- if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
- __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
- spin_lock_bh(&queue->lock);
- queue->queue_maxlen = ntohl(*queue_maxlen);
- spin_unlock_bh(&queue->lock);
- }
- if (nfqa[NFQA_CFG_FLAGS]) {
- spin_lock_bh(&queue->lock);
- queue->flags &= ~mask;
- queue->flags |= flags & mask;
- spin_unlock_bh(&queue->lock);
- }
- err_out_unlock:
- rcu_read_unlock();
- return ret;
- }
- static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
- [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp,
- .attr_count = NFQA_MAX, },
- [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict,
- .attr_count = NFQA_MAX,
- .policy = nfqa_verdict_policy },
- [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
- .attr_count = NFQA_CFG_MAX,
- .policy = nfqa_cfg_policy },
- [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
- .attr_count = NFQA_MAX,
- .policy = nfqa_verdict_batch_policy },
- };
- static const struct nfnetlink_subsystem nfqnl_subsys = {
- .name = "nf_queue",
- .subsys_id = NFNL_SUBSYS_QUEUE,
- .cb_count = NFQNL_MSG_MAX,
- .cb = nfqnl_cb,
- };
- #ifdef CONFIG_PROC_FS
- struct iter_state {
- struct seq_net_private p;
- unsigned int bucket;
- };
- static struct hlist_node *get_first(struct seq_file *seq)
- {
- struct iter_state *st = seq->private;
- struct net *net;
- struct nfnl_queue_net *q;
- if (!st)
- return NULL;
- net = seq_file_net(seq);
- q = nfnl_queue_pernet(net);
- for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
- if (!hlist_empty(&q->instance_table[st->bucket]))
- return q->instance_table[st->bucket].first;
- }
- return NULL;
- }
- static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
- {
- struct iter_state *st = seq->private;
- struct net *net = seq_file_net(seq);
- h = h->next;
- while (!h) {
- struct nfnl_queue_net *q;
- if (++st->bucket >= INSTANCE_BUCKETS)
- return NULL;
- q = nfnl_queue_pernet(net);
- h = q->instance_table[st->bucket].first;
- }
- return h;
- }
- static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
- {
- struct hlist_node *head;
- head = get_first(seq);
- if (head)
- while (pos && (head = get_next(seq, head)))
- pos--;
- return pos ? NULL : head;
- }
- static void *seq_start(struct seq_file *s, loff_t *pos)
- __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
- {
- spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
- return get_idx(s, *pos);
- }
- static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
- {
- (*pos)++;
- return get_next(s, v);
- }
- static void seq_stop(struct seq_file *s, void *v)
- __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
- {
- spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
- }
- static int seq_show(struct seq_file *s, void *v)
- {
- const struct nfqnl_instance *inst = v;
- seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n",
- inst->queue_num,
- inst->peer_portid, inst->queue_total,
- inst->copy_mode, inst->copy_range,
- inst->queue_dropped, inst->queue_user_dropped,
- inst->id_sequence, 1);
- return 0;
- }
- static const struct seq_operations nfqnl_seq_ops = {
- .start = seq_start,
- .next = seq_next,
- .stop = seq_stop,
- .show = seq_show,
- };
- #endif /* PROC_FS */
- static int __net_init nfnl_queue_net_init(struct net *net)
- {
- unsigned int i;
- struct nfnl_queue_net *q = nfnl_queue_pernet(net);
- for (i = 0; i < INSTANCE_BUCKETS; i++)
- INIT_HLIST_HEAD(&q->instance_table[i]);
- spin_lock_init(&q->instances_lock);
- #ifdef CONFIG_PROC_FS
- if (!proc_create_net("nfnetlink_queue", 0440, net->nf.proc_netfilter,
- &nfqnl_seq_ops, sizeof(struct iter_state)))
- return -ENOMEM;
- #endif
- nf_register_queue_handler(net, &nfqh);
- return 0;
- }
- static void __net_exit nfnl_queue_net_exit(struct net *net)
- {
- struct nfnl_queue_net *q = nfnl_queue_pernet(net);
- unsigned int i;
- nf_unregister_queue_handler(net);
- #ifdef CONFIG_PROC_FS
- remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
- #endif
- for (i = 0; i < INSTANCE_BUCKETS; i++)
- WARN_ON_ONCE(!hlist_empty(&q->instance_table[i]));
- }
- static void nfnl_queue_net_exit_batch(struct list_head *net_exit_list)
- {
- synchronize_rcu();
- }
- static struct pernet_operations nfnl_queue_net_ops = {
- .init = nfnl_queue_net_init,
- .exit = nfnl_queue_net_exit,
- .exit_batch = nfnl_queue_net_exit_batch,
- .id = &nfnl_queue_net_id,
- .size = sizeof(struct nfnl_queue_net),
- };
- static int __init nfnetlink_queue_init(void)
- {
- int status;
- status = register_pernet_subsys(&nfnl_queue_net_ops);
- if (status < 0) {
- pr_err("failed to register pernet ops\n");
- goto out;
- }
- netlink_register_notifier(&nfqnl_rtnl_notifier);
- status = nfnetlink_subsys_register(&nfqnl_subsys);
- if (status < 0) {
- pr_err("failed to create netlink socket\n");
- goto cleanup_netlink_notifier;
- }
- status = register_netdevice_notifier(&nfqnl_dev_notifier);
- if (status < 0) {
- pr_err("failed to register netdevice notifier\n");
- goto cleanup_netlink_subsys;
- }
- return status;
- cleanup_netlink_subsys:
- nfnetlink_subsys_unregister(&nfqnl_subsys);
- cleanup_netlink_notifier:
- netlink_unregister_notifier(&nfqnl_rtnl_notifier);
- unregister_pernet_subsys(&nfnl_queue_net_ops);
- out:
- return status;
- }
- static void __exit nfnetlink_queue_fini(void)
- {
- unregister_netdevice_notifier(&nfqnl_dev_notifier);
- nfnetlink_subsys_unregister(&nfqnl_subsys);
- netlink_unregister_notifier(&nfqnl_rtnl_notifier);
- unregister_pernet_subsys(&nfnl_queue_net_ops);
- rcu_barrier(); /* Wait for completion of call_rcu()'s */
- }
- MODULE_DESCRIPTION("netfilter packet queue handler");
- MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
- MODULE_LICENSE("GPL");
- MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
- module_init(nfnetlink_queue_init);
- module_exit(nfnetlink_queue_fini);
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