| // 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 <linux/cgroup-defs.h> |
| #include <net/gso.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); |
| |
| rcu_read_lock(); |
| nfqnl_flush(inst, NULL, 0); |
| rcu_read_unlock(); |
| 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 unsigned int nf_iterate(struct sk_buff *skb, |
| struct nf_hook_state *state, |
| const struct nf_hook_entries *hooks, |
| unsigned int *index) |
| { |
| const struct nf_hook_entry *hook; |
| unsigned int verdict, i = *index; |
| |
| while (i < hooks->num_hook_entries) { |
| hook = &hooks->hooks[i]; |
| repeat: |
| verdict = nf_hook_entry_hookfn(hook, skb, state); |
| if (verdict != NF_ACCEPT) { |
| *index = i; |
| if (verdict != NF_REPEAT) |
| return verdict; |
| goto repeat; |
| } |
| i++; |
| } |
| |
| *index = i; |
| return NF_ACCEPT; |
| } |
| |
| static struct nf_hook_entries *nf_hook_entries_head(const struct net *net, u8 pf, u8 hooknum) |
| { |
| switch (pf) { |
| #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE |
| case NFPROTO_BRIDGE: |
| return rcu_dereference(net->nf.hooks_bridge[hooknum]); |
| #endif |
| case NFPROTO_IPV4: |
| return rcu_dereference(net->nf.hooks_ipv4[hooknum]); |
| case NFPROTO_IPV6: |
| return rcu_dereference(net->nf.hooks_ipv6[hooknum]); |
| default: |
| WARN_ON_ONCE(1); |
| return NULL; |
| } |
| |
| return NULL; |
| } |
| |
| static int nf_ip_reroute(struct sk_buff *skb, const struct nf_queue_entry *entry) |
| { |
| #ifdef CONFIG_INET |
| const struct ip_rt_info *rt_info = nf_queue_entry_reroute(entry); |
| |
| if (entry->state.hook == NF_INET_LOCAL_OUT) { |
| const struct iphdr *iph = ip_hdr(skb); |
| |
| if (!(iph->tos == rt_info->tos && |
| skb->mark == rt_info->mark && |
| iph->daddr == rt_info->daddr && |
| iph->saddr == rt_info->saddr)) |
| return ip_route_me_harder(entry->state.net, entry->state.sk, |
| skb, RTN_UNSPEC); |
| } |
| #endif |
| return 0; |
| } |
| |
| static int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry) |
| { |
| const struct nf_ipv6_ops *v6ops; |
| int ret = 0; |
| |
| switch (entry->state.pf) { |
| case AF_INET: |
| ret = nf_ip_reroute(skb, entry); |
| break; |
| case AF_INET6: |
| v6ops = rcu_dereference(nf_ipv6_ops); |
| if (v6ops) |
| ret = v6ops->reroute(skb, entry); |
| break; |
| } |
| return ret; |
| } |
| |
| /* caller must hold rcu read-side lock */ |
| static void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict) |
| { |
| const struct nf_hook_entry *hook_entry; |
| const struct nf_hook_entries *hooks; |
| struct sk_buff *skb = entry->skb; |
| const struct net *net; |
| unsigned int i; |
| int err; |
| u8 pf; |
| |
| net = entry->state.net; |
| pf = entry->state.pf; |
| |
| hooks = nf_hook_entries_head(net, pf, entry->state.hook); |
| |
| i = entry->hook_index; |
| if (!hooks || i >= hooks->num_hook_entries) { |
| kfree_skb_reason(skb, SKB_DROP_REASON_NETFILTER_DROP); |
| nf_queue_entry_free(entry); |
| return; |
| } |
| |
| hook_entry = &hooks->hooks[i]; |
| |
| /* Continue traversal iff userspace said ok... */ |
| if (verdict == NF_REPEAT) |
| verdict = nf_hook_entry_hookfn(hook_entry, skb, &entry->state); |
| |
| if (verdict == NF_ACCEPT) { |
| if (nf_reroute(skb, entry) < 0) |
| verdict = NF_DROP; |
| } |
| |
| if (verdict == NF_ACCEPT) { |
| next_hook: |
| ++i; |
| verdict = nf_iterate(skb, &entry->state, hooks, &i); |
| } |
| |
| switch (verdict & NF_VERDICT_MASK) { |
| case NF_ACCEPT: |
| case NF_STOP: |
| local_bh_disable(); |
| entry->state.okfn(entry->state.net, entry->state.sk, skb); |
| local_bh_enable(); |
| break; |
| case NF_QUEUE: |
| err = nf_queue(skb, &entry->state, i, verdict); |
| if (err == 1) |
| goto next_hook; |
| break; |
| case NF_STOLEN: |
| break; |
| default: |
| kfree_skb(skb); |
| } |
| |
| nf_queue_entry_free(entry); |
| } |
| |
| static void nfqnl_reinject(struct nf_queue_entry *entry, unsigned int verdict) |
| { |
| const struct nf_ct_hook *ct_hook; |
| |
| if (verdict == NF_ACCEPT || |
| verdict == NF_REPEAT || |
| verdict == NF_STOP) { |
| unsigned int ct_verdict = verdict; |
| |
| rcu_read_lock(); |
| ct_hook = rcu_dereference(nf_ct_hook); |
| if (ct_hook) |
| ct_verdict = ct_hook->update(entry->state.net, entry->skb); |
| rcu_read_unlock(); |
| |
| switch (ct_verdict & NF_VERDICT_MASK) { |
| case NF_ACCEPT: |
| /* follow userspace verdict, could be REPEAT */ |
| break; |
| case NF_STOLEN: |
| nf_queue_entry_free(entry); |
| return; |
| default: |
| verdict = ct_verdict & NF_VERDICT_MASK; |
| break; |
| } |
| } |
| 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 int nfqnl_put_sk_classid(struct sk_buff *skb, struct sock *sk) |
| { |
| #if IS_ENABLED(CONFIG_CGROUP_NET_CLASSID) |
| if (sk && sk_fullsock(sk)) { |
| u32 classid = sock_cgroup_classid(&sk->sk_cgrp_data); |
| |
| if (classid && nla_put_be32(skb, NFQA_CGROUP_CLASSID, htonl(classid))) |
| return -1; |
| } |
| #endif |
| return 0; |
| } |
| |
| 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 sk_buff *entskb = entry->skb; |
| struct net_device *indev; |
| struct net_device *outdev; |
| struct nf_conn *ct = NULL; |
| enum ip_conntrack_info ctinfo = 0; |
| const struct nfnl_ct_hook *nfnl_ct; |
| bool csum_verify; |
| char *secdata = NULL; |
| u32 seclen = 0; |
| ktime_t tstamp; |
| |
| 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(u_int32_t)) /* priority */ |
| + nla_total_size(sizeof(struct nfqnl_msg_packet_hw)) |
| + nla_total_size(sizeof(u_int32_t)) /* skbinfo */ |
| #if IS_ENABLED(CONFIG_CGROUP_NET_CLASSID) |
| + nla_total_size(sizeof(u_int32_t)) /* classid */ |
| #endif |
| + nla_total_size(sizeof(u_int32_t)); /* cap_len */ |
| |
| tstamp = skb_tstamp_cond(entskb, false); |
| if (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 IS_ENABLED(CONFIG_NF_CONNTRACK) |
| if (queue->flags & NFQA_CFG_F_CONNTRACK) { |
| if (nfnl_ct != NULL) { |
| ct = nf_ct_get(entskb, &ctinfo); |
| if (ct != NULL) |
| size += nfnl_ct->build_size(ct); |
| } |
| } |
| #endif |
| |
| 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 = nfnl_msg_put(skb, 0, 0, |
| nfnl_msg_type(NFNL_SUBSYS_QUEUE, NFQNL_MSG_PACKET), |
| 0, entry->state.pf, NFNETLINK_V0, |
| htons(queue->queue_num)); |
| if (!nlh) { |
| skb_tx_error(entskb); |
| kfree_skb(skb); |
| goto nlmsg_failure; |
| } |
| |
| 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 (entskb->priority && |
| nla_put_be32(skb, NFQA_PRIORITY, htonl(entskb->priority))) |
| 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 && tstamp) { |
| struct nfqnl_msg_packet_timestamp ts; |
| struct timespec64 kts = ktime_to_timespec64(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 (nfqnl_put_sk_classid(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; |
| struct nf_conn *ct = (void *)skb_nfct(entry->skb); |
| unsigned long status; |
| unsigned int use; |
| |
| if (!ct) |
| return false; |
| |
| status = READ_ONCE(ct->status); |
| if ((status & flags) == IPS_DYING) |
| return true; |
| |
| if (status & IPS_CONFIRMED) |
| return false; |
| |
| /* in some cases skb_clone() can occur after initial conntrack |
| * pickup, but conntrack assumes exclusive skb->_nfct ownership for |
| * unconfirmed entries. |
| * |
| * This happens for br_netfilter and with ip multicast routing. |
| * We can't be solved with serialization here because one clone could |
| * have been queued for local delivery. |
| */ |
| use = refcount_read(&ct->ct_general.use); |
| if (likely(use == 1)) |
| return false; |
| |
| /* Can't decrement further? Exclusive ownership. */ |
| if (!refcount_dec_not_one(&ct->ct_general.use)) |
| return false; |
| |
| skb_set_nfct(entry->skb, 0); |
| /* No nf_ct_put(): we already decremented .use and it cannot |
| * drop down to 0. |
| */ |
| 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, unsigned int data_len, struct nf_queue_entry *e, int diff) |
| { |
| struct sk_buff *nskb; |
| |
| if (diff < 0) { |
| unsigned int min_len = skb_transport_offset(e->skb); |
| |
| if (data_len < min_len) |
| return -EINVAL; |
| |
| 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; |
| |
| /* This function is also called on net namespace error unwind, |
| * when pernet_ops->init() failed and ->exit() functions of the |
| * previous pernet_ops gets called. |
| * |
| * This may result in a call to nfqnl_nf_hook_drop() before |
| * struct nfnl_queue_net was allocated. |
| */ |
| if (!q) |
| return; |
| |
| 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 }, |
| [NFQA_PRIORITY] = { .type = NLA_U32 }, |
| }; |
| |
| 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 }, |
| [NFQA_PRIORITY] = { .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 sk_buff *skb, |
| const struct nfnl_info *info, |
| const struct nlattr * const nfqa[]) |
| { |
| struct nfnl_queue_net *q = nfnl_queue_pernet(info->net); |
| u16 queue_num = ntohs(info->nfmsg->res_id); |
| struct nf_queue_entry *entry, *tmp; |
| struct nfqnl_msg_verdict_hdr *vhdr; |
| struct nfqnl_instance *queue; |
| unsigned int verdict, maxid; |
| LIST_HEAD(batch_list); |
| |
| 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])); |
| |
| if (nfqa[NFQA_PRIORITY]) |
| entry->skb->priority = ntohl(nla_get_be32(nfqa[NFQA_PRIORITY])); |
| |
| nfqnl_reinject(entry, verdict); |
| } |
| return 0; |
| } |
| |
| static struct nf_conn *nfqnl_ct_parse(const 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) |
| { |
| #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
| struct nf_conn *ct; |
| |
| ct = nf_ct_get(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; |
| #else |
| return NULL; |
| #endif |
| } |
| |
| 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 sk_buff *skb, const struct nfnl_info *info, |
| const struct nlattr * const nfqa[]) |
| { |
| struct nfnl_queue_net *q = nfnl_queue_pernet(info->net); |
| u_int16_t queue_num = ntohs(info->nfmsg->res_id); |
| const struct nfnl_ct_hook *nfnl_ct; |
| struct nfqnl_msg_verdict_hdr *vhdr; |
| enum ip_conntrack_info ctinfo; |
| struct nfqnl_instance *queue; |
| struct nf_queue_entry *entry; |
| struct nf_conn *ct = NULL; |
| unsigned int verdict; |
| 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, info->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])); |
| |
| if (nfqa[NFQA_PRIORITY]) |
| entry->skb->priority = ntohl(nla_get_be32(nfqa[NFQA_PRIORITY])); |
| |
| nfqnl_reinject(entry, verdict); |
| return 0; |
| } |
| |
| static int nfqnl_recv_unsupp(struct sk_buff *skb, const struct nfnl_info *info, |
| const struct nlattr * const cda[]) |
| { |
| 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 sk_buff *skb, const struct nfnl_info *info, |
| const struct nlattr * const nfqa[]) |
| { |
| struct nfnl_queue_net *q = nfnl_queue_pernet(info->net); |
| u_int16_t queue_num = ntohs(info->nfmsg->res_id); |
| struct nfqnl_msg_config_cmd *cmd = NULL; |
| struct nfqnl_instance *queue; |
| __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 = nfqnl_recv_unsupp, |
| .type = NFNL_CB_RCU, |
| .attr_count = NFQA_MAX, |
| }, |
| [NFQNL_MSG_VERDICT] = { |
| .call = nfqnl_recv_verdict, |
| .type = NFNL_CB_RCU, |
| .attr_count = NFQA_MAX, |
| .policy = nfqa_verdict_policy |
| }, |
| [NFQNL_MSG_CONFIG] = { |
| .call = nfqnl_recv_config, |
| .type = NFNL_CB_MUTEX, |
| .attr_count = NFQA_CFG_MAX, |
| .policy = nfqa_cfg_policy |
| }, |
| [NFQNL_MSG_VERDICT_BATCH] = { |
| .call = nfqnl_recv_verdict_batch, |
| .type = NFNL_CB_RCU, |
| .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 |
| 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; |
| |
| #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 struct pernet_operations nfnl_queue_net_ops = { |
| .init = nfnl_queue_net_init, |
| .exit = nfnl_queue_net_exit, |
| .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; |
| } |
| |
| nf_register_queue_handler(&nfqh); |
| |
| 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) |
| { |
| nf_unregister_queue_handler(); |
| 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); |