/* * This is a module which is used for logging packets to userspace via * nfetlink. * * (C) 2005 by Harald Welte * (C) 2006-2012 Patrick McHardy * * Based on the old ipv4-only ipt_ULOG.c: * (C) 2000-2004 by Harald Welte * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_BRIDGE_NETFILTER #include "../bridge/br_private.h" #endif #define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ /* max packet size is limited by 16-bit struct nfattr nfa_len field */ #define NFULNL_COPY_RANGE_MAX (0xFFFF - NLA_HDRLEN) #define PRINTR(x, args...) do { if (net_ratelimit()) \ printk(x, ## args); } while (0); struct nfulnl_instance { struct hlist_node hlist; /* global list of instances */ spinlock_t lock; atomic_t use; /* use count */ unsigned int qlen; /* number of nlmsgs in skb */ struct sk_buff *skb; /* pre-allocatd skb */ struct timer_list timer; struct net *net; struct user_namespace *peer_user_ns; /* User namespace of the peer process */ int peer_portid; /* PORTID of the peer process */ /* configurable parameters */ unsigned int flushtimeout; /* timeout until queue flush */ unsigned int nlbufsiz; /* netlink buffer allocation size */ unsigned int qthreshold; /* threshold of the queue */ u_int32_t copy_range; u_int32_t seq; /* instance-local sequential counter */ u_int16_t group_num; /* number of this queue */ u_int16_t flags; u_int8_t copy_mode; struct rcu_head rcu; }; #define INSTANCE_BUCKETS 16 static int nfnl_log_net_id __read_mostly; struct nfnl_log_net { spinlock_t instances_lock; struct hlist_head instance_table[INSTANCE_BUCKETS]; atomic_t global_seq; }; static struct nfnl_log_net *nfnl_log_pernet(struct net *net) { return net_generic(net, nfnl_log_net_id); } static inline u_int8_t instance_hashfn(u_int16_t group_num) { return ((group_num & 0xff) % INSTANCE_BUCKETS); } static struct nfulnl_instance * __instance_lookup(struct nfnl_log_net *log, u_int16_t group_num) { struct hlist_head *head; struct nfulnl_instance *inst; head = &log->instance_table[instance_hashfn(group_num)]; hlist_for_each_entry_rcu(inst, head, hlist) { if (inst->group_num == group_num) return inst; } return NULL; } static inline void instance_get(struct nfulnl_instance *inst) { atomic_inc(&inst->use); } static struct nfulnl_instance * instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num) { struct nfulnl_instance *inst; rcu_read_lock_bh(); inst = __instance_lookup(log, group_num); if (inst && !atomic_inc_not_zero(&inst->use)) inst = NULL; rcu_read_unlock_bh(); return inst; } static void nfulnl_instance_free_rcu(struct rcu_head *head) { struct nfulnl_instance *inst = container_of(head, struct nfulnl_instance, rcu); put_net(inst->net); kfree(inst); module_put(THIS_MODULE); } static void instance_put(struct nfulnl_instance *inst) { if (inst && atomic_dec_and_test(&inst->use)) call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu); } static void nfulnl_timer(unsigned long data); static struct nfulnl_instance * instance_create(struct net *net, u_int16_t group_num, int portid, struct user_namespace *user_ns) { struct nfulnl_instance *inst; struct nfnl_log_net *log = nfnl_log_pernet(net); int err; spin_lock_bh(&log->instances_lock); if (__instance_lookup(log, group_num)) { err = -EEXIST; goto out_unlock; } inst = kzalloc(sizeof(*inst), GFP_ATOMIC); if (!inst) { err = -ENOMEM; goto out_unlock; } if (!try_module_get(THIS_MODULE)) { kfree(inst); err = -EAGAIN; goto out_unlock; } INIT_HLIST_NODE(&inst->hlist); spin_lock_init(&inst->lock); /* needs to be two, since we _put() after creation */ atomic_set(&inst->use, 2); setup_timer(&inst->timer, nfulnl_timer, (unsigned long)inst); inst->net = get_net(net); inst->peer_user_ns = user_ns; inst->peer_portid = portid; inst->group_num = group_num; inst->qthreshold = NFULNL_QTHRESH_DEFAULT; inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT; inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT; inst->copy_mode = NFULNL_COPY_PACKET; inst->copy_range = NFULNL_COPY_RANGE_MAX; hlist_add_head_rcu(&inst->hlist, &log->instance_table[instance_hashfn(group_num)]); spin_unlock_bh(&log->instances_lock); return inst; out_unlock: spin_unlock_bh(&log->instances_lock); return ERR_PTR(err); } static void __nfulnl_flush(struct nfulnl_instance *inst); /* called with BH disabled */ static void __instance_destroy(struct nfulnl_instance *inst) { /* first pull it out of the global list */ hlist_del_rcu(&inst->hlist); /* then flush all pending packets from skb */ spin_lock(&inst->lock); /* lockless readers wont be able to use us */ inst->copy_mode = NFULNL_COPY_DISABLED; if (inst->skb) __nfulnl_flush(inst); spin_unlock(&inst->lock); /* and finally put the refcount */ instance_put(inst); } static inline void instance_destroy(struct nfnl_log_net *log, struct nfulnl_instance *inst) { spin_lock_bh(&log->instances_lock); __instance_destroy(inst); spin_unlock_bh(&log->instances_lock); } static int nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode, unsigned int range) { int status = 0; spin_lock_bh(&inst->lock); switch (mode) { case NFULNL_COPY_NONE: case NFULNL_COPY_META: inst->copy_mode = mode; inst->copy_range = 0; break; case NFULNL_COPY_PACKET: inst->copy_mode = mode; if (range == 0) range = NFULNL_COPY_RANGE_MAX; inst->copy_range = min_t(unsigned int, range, NFULNL_COPY_RANGE_MAX); break; default: status = -EINVAL; break; } spin_unlock_bh(&inst->lock); return status; } static int nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz) { int status; spin_lock_bh(&inst->lock); if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT) status = -ERANGE; else if (nlbufsiz > 131072) status = -ERANGE; else { inst->nlbufsiz = nlbufsiz; status = 0; } spin_unlock_bh(&inst->lock); return status; } static int nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout) { spin_lock_bh(&inst->lock); inst->flushtimeout = timeout; spin_unlock_bh(&inst->lock); return 0; } static int nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh) { spin_lock_bh(&inst->lock); inst->qthreshold = qthresh; spin_unlock_bh(&inst->lock); return 0; } static int nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags) { spin_lock_bh(&inst->lock); inst->flags = flags; spin_unlock_bh(&inst->lock); return 0; } static struct sk_buff * nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size, unsigned int pkt_size) { struct sk_buff *skb; unsigned int n; /* alloc skb which should be big enough for a whole multipart * message. WARNING: has to be <= 128k due to slab restrictions */ n = max(inst_size, pkt_size); skb = nfnetlink_alloc_skb(net, n, peer_portid, GFP_ATOMIC); if (!skb) { if (n > pkt_size) { /* try to allocate only as much as we need for current * packet */ skb = nfnetlink_alloc_skb(net, pkt_size, peer_portid, GFP_ATOMIC); if (!skb) pr_err("nfnetlink_log: can't even alloc %u bytes\n", pkt_size); } } return skb; } static void __nfulnl_send(struct nfulnl_instance *inst) { if (inst->qlen > 1) { struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0, NLMSG_DONE, sizeof(struct nfgenmsg), 0); if (WARN_ONCE(!nlh, "bad nlskb size: %u, tailroom %d\n", inst->skb->len, skb_tailroom(inst->skb))) { kfree_skb(inst->skb); goto out; } } nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid, MSG_DONTWAIT); out: inst->qlen = 0; inst->skb = NULL; } static void __nfulnl_flush(struct nfulnl_instance *inst) { /* timer holds a reference */ if (del_timer(&inst->timer)) instance_put(inst); if (inst->skb) __nfulnl_send(inst); } static void nfulnl_timer(unsigned long data) { struct nfulnl_instance *inst = (struct nfulnl_instance *)data; spin_lock_bh(&inst->lock); if (inst->skb) __nfulnl_send(inst); spin_unlock_bh(&inst->lock); instance_put(inst); } /* This is an inline function, we don't really care about a long * list of arguments */ static inline int __build_packet_message(struct nfnl_log_net *log, struct nfulnl_instance *inst, const struct sk_buff *skb, unsigned int data_len, u_int8_t pf, unsigned int hooknum, const struct net_device *indev, const struct net_device *outdev, const char *prefix, unsigned int plen) { struct nfulnl_msg_packet_hdr pmsg; struct nlmsghdr *nlh; struct nfgenmsg *nfmsg; sk_buff_data_t old_tail = inst->skb->tail; struct sock *sk; const unsigned char *hwhdrp; nlh = nlmsg_put(inst->skb, 0, 0, NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, sizeof(struct nfgenmsg), 0); if (!nlh) return -1; nfmsg = nlmsg_data(nlh); nfmsg->nfgen_family = pf; nfmsg->version = NFNETLINK_V0; nfmsg->res_id = htons(inst->group_num); memset(&pmsg, 0, sizeof(pmsg)); pmsg.hw_protocol = skb->protocol; pmsg.hook = hooknum; if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg)) goto nla_put_failure; if (prefix && nla_put(inst->skb, NFULA_PREFIX, plen, prefix)) goto nla_put_failure; if (indev) { #ifndef CONFIG_BRIDGE_NETFILTER if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, htonl(indev->ifindex))) goto nla_put_failure; #else if (pf == PF_BRIDGE) { /* Case 1: outdev is physical input device, we need to * look for bridge group (when called from * netfilter_bridge) */ if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, htonl(indev->ifindex)) || /* this is the bridge group "brX" */ /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, htonl(br_port_get_rcu(indev)->br->dev->ifindex))) goto nla_put_failure; } else { /* Case 2: indev is bridge group, we need to look for * physical device (when called from ipv4) */ if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV, htonl(indev->ifindex))) goto nla_put_failure; if (skb->nf_bridge && skb->nf_bridge->physindev && nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV, htonl(skb->nf_bridge->physindev->ifindex))) goto nla_put_failure; } #endif } if (outdev) { #ifndef CONFIG_BRIDGE_NETFILTER if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) goto nla_put_failure; #else if (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(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, htonl(outdev->ifindex)) || /* this is the bridge group "brX" */ /* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */ nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, htonl(br_port_get_rcu(outdev)->br->dev->ifindex))) goto nla_put_failure; } else { /* Case 2: indev is a bridge group, we need to look * for physical device (when called from ipv4) */ if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV, htonl(outdev->ifindex))) goto nla_put_failure; if (skb->nf_bridge && skb->nf_bridge->physoutdev && nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, htonl(skb->nf_bridge->physoutdev->ifindex))) goto nla_put_failure; } #endif } if (skb->mark && nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark))) goto nla_put_failure; if (indev && skb->dev && skb->mac_header != skb->network_header) { struct nfulnl_msg_packet_hw phw; int len; memset(&phw, 0, sizeof(phw)); len = dev_parse_header(skb, phw.hw_addr); if (len > 0) { phw.hw_addrlen = htons(len); if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw)) goto nla_put_failure; } } if (indev && skb_mac_header_was_set(skb)) { if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) || nla_put_be16(inst->skb, NFULA_HWLEN, htons(skb->dev->hard_header_len))) goto nla_put_failure; hwhdrp = skb_mac_header(skb); if (skb->dev->type == ARPHRD_SIT) hwhdrp -= ETH_HLEN; if (hwhdrp >= skb->head && nla_put(inst->skb, NFULA_HWHEADER, skb->dev->hard_header_len, hwhdrp)) goto nla_put_failure; } if (skb->tstamp.tv64) { struct nfulnl_msg_packet_timestamp ts; struct timeval tv = ktime_to_timeval(skb->tstamp); ts.sec = cpu_to_be64(tv.tv_sec); ts.usec = cpu_to_be64(tv.tv_usec); if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts)) goto nla_put_failure; } /* UID */ sk = skb->sk; if (sk && sk->sk_state != TCP_TIME_WAIT) { read_lock_bh(&sk->sk_callback_lock); if (sk->sk_socket && sk->sk_socket->file) { struct file *file = sk->sk_socket->file; const struct cred *cred = file->f_cred; struct user_namespace *user_ns = inst->peer_user_ns; __be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid)); __be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid)); read_unlock_bh(&sk->sk_callback_lock); if (nla_put_be32(inst->skb, NFULA_UID, uid) || nla_put_be32(inst->skb, NFULA_GID, gid)) goto nla_put_failure; } else read_unlock_bh(&sk->sk_callback_lock); } /* local sequence number */ if ((inst->flags & NFULNL_CFG_F_SEQ) && nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++))) goto nla_put_failure; /* global sequence number */ if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) && nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL, htonl(atomic_inc_return(&log->global_seq)))) goto nla_put_failure; if (data_len) { struct nlattr *nla; int size = nla_attr_size(data_len); if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); return -1; } nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); nla->nla_type = NFULA_PAYLOAD; nla->nla_len = size; if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) BUG(); } nlh->nlmsg_len = inst->skb->tail - old_tail; return 0; nla_put_failure: PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n"); return -1; } #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0) static struct nf_loginfo default_loginfo = { .type = NF_LOG_TYPE_ULOG, .u = { .ulog = { .copy_len = 0xffff, .group = 0, .qthreshold = 1, }, }, }; /* log handler for internal netfilter logging api */ void nfulnl_log_packet(struct net *net, u_int8_t pf, unsigned int hooknum, const struct sk_buff *skb, const struct net_device *in, const struct net_device *out, const struct nf_loginfo *li_user, const char *prefix) { unsigned int size, data_len; struct nfulnl_instance *inst; const struct nf_loginfo *li; unsigned int qthreshold; unsigned int plen; struct nfnl_log_net *log = nfnl_log_pernet(net); if (li_user && li_user->type == NF_LOG_TYPE_ULOG) li = li_user; else li = &default_loginfo; inst = instance_lookup_get(log, li->u.ulog.group); if (!inst) return; plen = 0; if (prefix) plen = strlen(prefix) + 1; /* FIXME: do we want to make the size calculation conditional based on * what is actually present? way more branches and checks, but more * memory efficient... */ size = nlmsg_total_size(sizeof(struct nfgenmsg)) + nla_total_size(sizeof(struct nfulnl_msg_packet_hdr)) + nla_total_size(sizeof(u_int32_t)) /* ifindex */ + nla_total_size(sizeof(u_int32_t)) /* ifindex */ #ifdef 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)) /* uid */ + nla_total_size(sizeof(u_int32_t)) /* gid */ + nla_total_size(plen) /* prefix */ + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)) + nla_total_size(sizeof(struct nfgenmsg)); /* NLMSG_DONE */ if (in && skb_mac_header_was_set(skb)) { size += nla_total_size(skb->dev->hard_header_len) + nla_total_size(sizeof(u_int16_t)) /* hwtype */ + nla_total_size(sizeof(u_int16_t)); /* hwlen */ } spin_lock_bh(&inst->lock); if (inst->flags & NFULNL_CFG_F_SEQ) size += nla_total_size(sizeof(u_int32_t)); if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) size += nla_total_size(sizeof(u_int32_t)); qthreshold = inst->qthreshold; /* per-rule qthreshold overrides per-instance */ if (li->u.ulog.qthreshold) if (qthreshold > li->u.ulog.qthreshold) qthreshold = li->u.ulog.qthreshold; switch (inst->copy_mode) { case NFULNL_COPY_META: case NFULNL_COPY_NONE: data_len = 0; break; case NFULNL_COPY_PACKET: if (inst->copy_range > skb->len) data_len = skb->len; else data_len = inst->copy_range; size += nla_total_size(data_len); break; case NFULNL_COPY_DISABLED: default: goto unlock_and_release; } if (inst->skb && size > skb_tailroom(inst->skb)) { /* either the queue len is too high or we don't have * enough room in the skb left. flush to userspace. */ __nfulnl_flush(inst); } if (!inst->skb) { inst->skb = nfulnl_alloc_skb(net, inst->peer_portid, inst->nlbufsiz, size); if (!inst->skb) goto alloc_failure; } inst->qlen++; __build_packet_message(log, inst, skb, data_len, pf, hooknum, in, out, prefix, plen); if (inst->qlen >= qthreshold) __nfulnl_flush(inst); /* timer_pending always called within inst->lock, so there * is no chance of a race here */ else if (!timer_pending(&inst->timer)) { instance_get(inst); inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); add_timer(&inst->timer); } unlock_and_release: spin_unlock_bh(&inst->lock); instance_put(inst); return; alloc_failure: /* FIXME: statistics */ goto unlock_and_release; } EXPORT_SYMBOL_GPL(nfulnl_log_packet); static int nfulnl_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr) { struct netlink_notify *n = ptr; struct nfnl_log_net *log = nfnl_log_pernet(n->net); if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) { int i; /* destroy all instances for this portid */ spin_lock_bh(&log->instances_lock); for (i = 0; i < INSTANCE_BUCKETS; i++) { struct hlist_node *t2; struct nfulnl_instance *inst; struct hlist_head *head = &log->instance_table[i]; hlist_for_each_entry_safe(inst, t2, head, hlist) { if (n->portid == inst->peer_portid) __instance_destroy(inst); } } spin_unlock_bh(&log->instances_lock); } return NOTIFY_DONE; } static struct notifier_block nfulnl_rtnl_notifier = { .notifier_call = nfulnl_rcv_nl_event, }; static int nfulnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb, const struct nlmsghdr *nlh, const struct nlattr * const nfqa[]) { return -ENOTSUPP; } static struct nf_logger nfulnl_logger __read_mostly = { .name = "nfnetlink_log", .logfn = &nfulnl_log_packet, .me = THIS_MODULE, }; static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = { [NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) }, [NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) }, [NFULA_CFG_TIMEOUT] = { .type = NLA_U32 }, [NFULA_CFG_QTHRESH] = { .type = NLA_U32 }, [NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 }, [NFULA_CFG_FLAGS] = { .type = NLA_U16 }, }; static int nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, const struct nlmsghdr *nlh, const struct nlattr * const nfula[]) { struct nfgenmsg *nfmsg = nlmsg_data(nlh); u_int16_t group_num = ntohs(nfmsg->res_id); struct nfulnl_instance *inst; struct nfulnl_msg_config_cmd *cmd = NULL; struct net *net = sock_net(ctnl); struct nfnl_log_net *log = nfnl_log_pernet(net); int ret = 0; if (nfula[NFULA_CFG_CMD]) { u_int8_t pf = nfmsg->nfgen_family; cmd = nla_data(nfula[NFULA_CFG_CMD]); /* Commands without queue context */ switch (cmd->command) { case NFULNL_CFG_CMD_PF_BIND: return nf_log_bind_pf(net, pf, &nfulnl_logger); case NFULNL_CFG_CMD_PF_UNBIND: nf_log_unbind_pf(net, pf); return 0; } } inst = instance_lookup_get(log, group_num); if (inst && inst->peer_portid != NETLINK_CB(skb).portid) { ret = -EPERM; goto out_put; } if (cmd != NULL) { switch (cmd->command) { case NFULNL_CFG_CMD_BIND: if (inst) { ret = -EBUSY; goto out_put; } inst = instance_create(net, group_num, NETLINK_CB(skb).portid, sk_user_ns(NETLINK_CB(skb).sk)); if (IS_ERR(inst)) { ret = PTR_ERR(inst); goto out; } break; case NFULNL_CFG_CMD_UNBIND: if (!inst) { ret = -ENODEV; goto out; } instance_destroy(log, inst); goto out_put; default: ret = -ENOTSUPP; break; } } if (nfula[NFULA_CFG_MODE]) { struct nfulnl_msg_config_mode *params; params = nla_data(nfula[NFULA_CFG_MODE]); if (!inst) { ret = -ENODEV; goto out; } nfulnl_set_mode(inst, params->copy_mode, ntohl(params->copy_range)); } if (nfula[NFULA_CFG_TIMEOUT]) { __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); if (!inst) { ret = -ENODEV; goto out; } nfulnl_set_timeout(inst, ntohl(timeout)); } if (nfula[NFULA_CFG_NLBUFSIZ]) { __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); if (!inst) { ret = -ENODEV; goto out; } nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); } if (nfula[NFULA_CFG_QTHRESH]) { __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); if (!inst) { ret = -ENODEV; goto out; } nfulnl_set_qthresh(inst, ntohl(qthresh)); } if (nfula[NFULA_CFG_FLAGS]) { __be16 flags = nla_get_be16(nfula[NFULA_CFG_FLAGS]); if (!inst) { ret = -ENODEV; goto out; } nfulnl_set_flags(inst, ntohs(flags)); } out_put: instance_put(inst); out: return ret; } static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = { [NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp, .attr_count = NFULA_MAX, }, [NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config, .attr_count = NFULA_CFG_MAX, .policy = nfula_cfg_policy }, }; static const struct nfnetlink_subsystem nfulnl_subsys = { .name = "log", .subsys_id = NFNL_SUBSYS_ULOG, .cb_count = NFULNL_MSG_MAX, .cb = nfulnl_cb, }; #ifdef CONFIG_PROC_FS struct iter_state { struct seq_net_private p; unsigned int bucket; }; static struct hlist_node *get_first(struct net *net, struct iter_state *st) { struct nfnl_log_net *log; if (!st) return NULL; log = nfnl_log_pernet(net); for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { struct hlist_head *head = &log->instance_table[st->bucket]; if (!hlist_empty(head)) return rcu_dereference_bh(hlist_first_rcu(head)); } return NULL; } static struct hlist_node *get_next(struct net *net, struct iter_state *st, struct hlist_node *h) { h = rcu_dereference_bh(hlist_next_rcu(h)); while (!h) { struct nfnl_log_net *log; struct hlist_head *head; if (++st->bucket >= INSTANCE_BUCKETS) return NULL; log = nfnl_log_pernet(net); head = &log->instance_table[st->bucket]; h = rcu_dereference_bh(hlist_first_rcu(head)); } return h; } static struct hlist_node *get_idx(struct net *net, struct iter_state *st, loff_t pos) { struct hlist_node *head; head = get_first(net, st); if (head) while (pos && (head = get_next(net, st, head))) pos--; return pos ? NULL : head; } static void *seq_start(struct seq_file *s, loff_t *pos) __acquires(rcu_bh) { rcu_read_lock_bh(); return get_idx(seq_file_net(s), s->private, *pos); } static void *seq_next(struct seq_file *s, void *v, loff_t *pos) { (*pos)++; return get_next(seq_file_net(s), s->private, v); } static void seq_stop(struct seq_file *s, void *v) __releases(rcu_bh) { rcu_read_unlock_bh(); } static int seq_show(struct seq_file *s, void *v) { const struct nfulnl_instance *inst = v; return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n", inst->group_num, inst->peer_portid, inst->qlen, inst->copy_mode, inst->copy_range, inst->flushtimeout, atomic_read(&inst->use)); } static const struct seq_operations nful_seq_ops = { .start = seq_start, .next = seq_next, .stop = seq_stop, .show = seq_show, }; static int nful_open(struct inode *inode, struct file *file) { return seq_open_net(inode, file, &nful_seq_ops, sizeof(struct iter_state)); } static const struct file_operations nful_file_ops = { .owner = THIS_MODULE, .open = nful_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_net, }; #endif /* PROC_FS */ static int __net_init nfnl_log_net_init(struct net *net) { unsigned int i; struct nfnl_log_net *log = nfnl_log_pernet(net); for (i = 0; i < INSTANCE_BUCKETS; i++) INIT_HLIST_HEAD(&log->instance_table[i]); spin_lock_init(&log->instances_lock); #ifdef CONFIG_PROC_FS if (!proc_create("nfnetlink_log", 0440, net->nf.proc_netfilter, &nful_file_ops)) return -ENOMEM; #endif return 0; } static void __net_exit nfnl_log_net_exit(struct net *net) { #ifdef CONFIG_PROC_FS remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter); #endif nf_log_unset(net, &nfulnl_logger); } static struct pernet_operations nfnl_log_net_ops = { .init = nfnl_log_net_init, .exit = nfnl_log_net_exit, .id = &nfnl_log_net_id, .size = sizeof(struct nfnl_log_net), }; static int __init nfnetlink_log_init(void) { int status = -ENOMEM; netlink_register_notifier(&nfulnl_rtnl_notifier); status = nfnetlink_subsys_register(&nfulnl_subsys); if (status < 0) { pr_err("log: failed to create netlink socket\n"); goto cleanup_netlink_notifier; } status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); if (status < 0) { pr_err("log: failed to register logger\n"); goto cleanup_subsys; } status = register_pernet_subsys(&nfnl_log_net_ops); if (status < 0) { pr_err("log: failed to register pernet ops\n"); goto cleanup_logger; } return status; cleanup_logger: nf_log_unregister(&nfulnl_logger); cleanup_subsys: nfnetlink_subsys_unregister(&nfulnl_subsys); cleanup_netlink_notifier: netlink_unregister_notifier(&nfulnl_rtnl_notifier); return status; } static void __exit nfnetlink_log_fini(void) { unregister_pernet_subsys(&nfnl_log_net_ops); nf_log_unregister(&nfulnl_logger); nfnetlink_subsys_unregister(&nfulnl_subsys); netlink_unregister_notifier(&nfulnl_rtnl_notifier); } MODULE_DESCRIPTION("netfilter userspace logging"); MODULE_AUTHOR("Harald Welte "); MODULE_LICENSE("GPL"); MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); module_init(nfnetlink_log_init); module_exit(nfnetlink_log_fini);