/* * This is a module which is used for logging packets to userspace via * nfetlink. * * (C) 2005 by Harald Welte * * 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 #ifdef CONFIG_BRIDGE_NETFILTER #include "../bridge/br_private.h" #endif #define NFULNL_NLBUFSIZ_DEFAULT 4096 #define NFULNL_TIMEOUT_DEFAULT 100 /* every second */ #define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */ #define PRINTR(x, args...) do { if (net_ratelimit()) \ printk(x, ## args); } while (0); #if 0 #define UDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \ __FILE__, __LINE__, __FUNCTION__, \ ## args) #else #define UDEBUG(x, ...) #endif 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 nlmsghdr *lastnlh; /* netlink header of last msg in skb */ struct timer_list timer; int peer_pid; /* PID 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_int16_t group_num; /* number of this queue */ u_int8_t copy_mode; }; static DEFINE_RWLOCK(instances_lock); #define INSTANCE_BUCKETS 16 static struct hlist_head instance_table[INSTANCE_BUCKETS]; static unsigned int hash_init; static inline u_int8_t instance_hashfn(u_int16_t group_num) { return ((group_num & 0xff) % INSTANCE_BUCKETS); } static struct nfulnl_instance * __instance_lookup(u_int16_t group_num) { struct hlist_head *head; struct hlist_node *pos; struct nfulnl_instance *inst; UDEBUG("entering (group_num=%u)\n", group_num); head = &instance_table[instance_hashfn(group_num)]; hlist_for_each_entry(inst, pos, 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(u_int16_t group_num) { struct nfulnl_instance *inst; read_lock_bh(&instances_lock); inst = __instance_lookup(group_num); if (inst) instance_get(inst); read_unlock_bh(&instances_lock); return inst; } static void instance_put(struct nfulnl_instance *inst) { if (inst && atomic_dec_and_test(&inst->use)) { UDEBUG("kfree(inst=%p)\n", inst); kfree(inst); } } static void nfulnl_timer(unsigned long data); static struct nfulnl_instance * instance_create(u_int16_t group_num, int pid) { struct nfulnl_instance *inst; UDEBUG("entering (group_num=%u, pid=%d)\n", group_num, pid); write_lock_bh(&instances_lock); if (__instance_lookup(group_num)) { inst = NULL; UDEBUG("aborting, instance already exists\n"); goto out_unlock; } inst = kzalloc(sizeof(*inst), GFP_ATOMIC); if (!inst) goto out_unlock; INIT_HLIST_NODE(&inst->hlist); inst->lock = SPIN_LOCK_UNLOCKED; /* needs to be two, since we _put() after creation */ atomic_set(&inst->use, 2); init_timer(&inst->timer); inst->timer.function = nfulnl_timer; inst->timer.data = (unsigned long)inst; /* don't start timer yet. (re)start it with every packet */ inst->peer_pid = pid; 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 = 0xffff; if (!try_module_get(THIS_MODULE)) goto out_free; hlist_add_head(&inst->hlist, &instance_table[instance_hashfn(group_num)]); UDEBUG("newly added node: %p, next=%p\n", &inst->hlist, inst->hlist.next); write_unlock_bh(&instances_lock); return inst; out_free: instance_put(inst); out_unlock: write_unlock_bh(&instances_lock); return NULL; } static int __nfulnl_send(struct nfulnl_instance *inst); static void _instance_destroy2(struct nfulnl_instance *inst, int lock) { /* first pull it out of the global list */ if (lock) write_lock_bh(&instances_lock); UDEBUG("removing instance %p (queuenum=%u) from hash\n", inst, inst->group_num); hlist_del(&inst->hlist); if (lock) write_unlock_bh(&instances_lock); /* then flush all pending packets from skb */ spin_lock_bh(&inst->lock); if (inst->skb) { if (inst->qlen) __nfulnl_send(inst); if (inst->skb) { kfree_skb(inst->skb); inst->skb = NULL; } } spin_unlock_bh(&inst->lock); /* and finally put the refcount */ instance_put(inst); module_put(THIS_MODULE); } static inline void __instance_destroy(struct nfulnl_instance *inst) { _instance_destroy2(inst, 0); } static inline void instance_destroy(struct nfulnl_instance *inst) { _instance_destroy2(inst, 1); } 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; /* we're using struct nfattr which has 16bit nfa_len */ if (range > 0xffff) inst->copy_range = 0xffff; else inst->copy_range = range; 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 struct sk_buff *nfulnl_alloc_skb(unsigned int inst_size, unsigned int pkt_size) { struct sk_buff *skb; UDEBUG("entered (%u, %u)\n", inst_size, pkt_size); /* alloc skb which should be big enough for a whole multipart * message. WARNING: has to be <= 128k due to slab restrictions */ skb = alloc_skb(inst_size, GFP_ATOMIC); if (!skb) { PRINTR("nfnetlink_log: can't alloc whole buffer (%u bytes)\n", inst_size); /* try to allocate only as much as we need for current * packet */ skb = alloc_skb(pkt_size, GFP_ATOMIC); if (!skb) PRINTR("nfnetlink_log: can't even alloc %u bytes\n", pkt_size); } return skb; } static int __nfulnl_send(struct nfulnl_instance *inst) { int status; if (timer_pending(&inst->timer)) del_timer(&inst->timer); if (inst->qlen > 1) inst->lastnlh->nlmsg_type = NLMSG_DONE; status = nfnetlink_unicast(inst->skb, inst->peer_pid, MSG_DONTWAIT); if (status < 0) { UDEBUG("netlink_unicast() failed\n"); /* FIXME: statistics */ } inst->qlen = 0; inst->skb = NULL; inst->lastnlh = NULL; return status; } static void nfulnl_timer(unsigned long data) { struct nfulnl_instance *inst = (struct nfulnl_instance *)data; UDEBUG("timer function called, flushing buffer\n"); spin_lock_bh(&inst->lock); __nfulnl_send(inst); instance_put(inst); spin_unlock_bh(&inst->lock); } static inline int __build_packet_message(struct nfulnl_instance *inst, const struct sk_buff *skb, unsigned int data_len, unsigned int pf, unsigned int hooknum, const struct net_device *indev, const struct net_device *outdev, const struct nf_loginfo *li, const char *prefix) { unsigned char *old_tail; struct nfulnl_msg_packet_hdr pmsg; struct nlmsghdr *nlh; struct nfgenmsg *nfmsg; u_int32_t tmp_uint; UDEBUG("entered\n"); old_tail = inst->skb->tail; nlh = NLMSG_PUT(inst->skb, 0, 0, NFNL_SUBSYS_ULOG << 8 | NFULNL_MSG_PACKET, sizeof(struct nfgenmsg)); nfmsg = NLMSG_DATA(nlh); nfmsg->nfgen_family = pf; nfmsg->version = NFNETLINK_V0; nfmsg->res_id = htons(inst->group_num); pmsg.hw_protocol = htons(skb->protocol); pmsg.hook = hooknum; NFA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg); if (prefix) { int slen = strlen(prefix); if (slen > NFULNL_PREFIXLEN) slen = NFULNL_PREFIXLEN; NFA_PUT(inst->skb, NFULA_PREFIX, slen, prefix); } if (indev) { tmp_uint = htonl(indev->ifindex); #ifndef CONFIG_BRIDGE_NETFILTER NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, sizeof(tmp_uint), &tmp_uint); #else if (pf == PF_BRIDGE) { /* Case 1: outdev is physical input device, we need to * look for bridge group (when called from * netfilter_bridge) */ NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV, sizeof(tmp_uint), &tmp_uint); /* this is the bridge group "brX" */ tmp_uint = htonl(indev->br_port->br->dev->ifindex); NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, sizeof(tmp_uint), &tmp_uint); } else { /* Case 2: indev is bridge group, we need to look for * physical device (when called from ipv4) */ NFA_PUT(inst->skb, NFULA_IFINDEX_INDEV, sizeof(tmp_uint), &tmp_uint); if (skb->nf_bridge && skb->nf_bridge->physindev) { tmp_uint = htonl(skb->nf_bridge->physindev->ifindex); NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSINDEV, sizeof(tmp_uint), &tmp_uint); } } #endif } if (outdev) { tmp_uint = htonl(outdev->ifindex); #ifndef CONFIG_BRIDGE_NETFILTER NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, sizeof(tmp_uint), &tmp_uint); #else if (pf == PF_BRIDGE) { /* Case 1: outdev is physical output device, we need to * look for bridge group (when called from * netfilter_bridge) */ NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, sizeof(tmp_uint), &tmp_uint); /* this is the bridge group "brX" */ tmp_uint = htonl(outdev->br_port->br->dev->ifindex); NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, sizeof(tmp_uint), &tmp_uint); } else { /* Case 2: indev is a bridge group, we need to look * for physical device (when called from ipv4) */ NFA_PUT(inst->skb, NFULA_IFINDEX_OUTDEV, sizeof(tmp_uint), &tmp_uint); if (skb->nf_bridge) { tmp_uint = htonl(skb->nf_bridge->physoutdev->ifindex); NFA_PUT(inst->skb, NFULA_IFINDEX_PHYSOUTDEV, sizeof(tmp_uint), &tmp_uint); } } #endif } if (skb->nfmark) { tmp_uint = htonl(skb->nfmark); NFA_PUT(inst->skb, NFULA_MARK, sizeof(tmp_uint), &tmp_uint); } if (indev && skb->dev && skb->dev->hard_header_parse) { struct nfulnl_msg_packet_hw phw; phw.hw_addrlen = skb->dev->hard_header_parse((struct sk_buff *)skb, phw.hw_addr); phw.hw_addrlen = htons(phw.hw_addrlen); NFA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw); } if (skb->tstamp.off_sec) { struct nfulnl_msg_packet_timestamp ts; ts.sec = cpu_to_be64(skb->tstamp.off_sec); ts.usec = cpu_to_be64(skb->tstamp.off_usec); NFA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts); } /* UID */ if (skb->sk) { read_lock_bh(&skb->sk->sk_callback_lock); if (skb->sk->sk_socket && skb->sk->sk_socket->file) { u_int32_t uid = htonl(skb->sk->sk_socket->file->f_uid); /* need to unlock here since NFA_PUT may goto */ read_unlock_bh(&skb->sk->sk_callback_lock); NFA_PUT(inst->skb, NFULA_UID, sizeof(uid), &uid); } else read_unlock_bh(&skb->sk->sk_callback_lock); } if (data_len) { struct nfattr *nfa; int size = NFA_LENGTH(data_len); if (skb_tailroom(inst->skb) < (int)NFA_SPACE(data_len)) { printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); goto nlmsg_failure; } nfa = (struct nfattr *)skb_put(inst->skb, NFA_ALIGN(size)); nfa->nfa_type = NFULA_PAYLOAD; nfa->nfa_len = size; if (skb_copy_bits(skb, 0, NFA_DATA(nfa), data_len)) BUG(); } nlh->nlmsg_len = inst->skb->tail - old_tail; return 0; nlmsg_failure: UDEBUG("nlmsg_failure\n"); nfattr_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 */ static void nfulnl_log_packet(unsigned int 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 nlbufsiz; if (li_user && li_user->type == NF_LOG_TYPE_ULOG) li = li_user; else li = &default_loginfo; inst = instance_lookup_get(li->u.ulog.group); if (!inst) inst = instance_lookup_get(0); if (!inst) { PRINTR("nfnetlink_log: trying to log packet, " "but no instance for group %u\n", li->u.ulog.group); return; } /* all macros expand to constant values at compile time */ /* 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_SPACE(sizeof(struct nfgenmsg)) + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hdr)) + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ #ifdef CONFIG_BRIDGE_NETFILTER + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ + NFA_SPACE(sizeof(u_int32_t)) /* ifindex */ #endif + NFA_SPACE(sizeof(u_int32_t)) /* mark */ + NFA_SPACE(sizeof(u_int32_t)) /* uid */ + NFA_SPACE(NFULNL_PREFIXLEN) /* prefix */ + NFA_SPACE(sizeof(struct nfulnl_msg_packet_hw)) + NFA_SPACE(sizeof(struct nfulnl_msg_packet_timestamp)); UDEBUG("initial size=%u\n", size); spin_lock_bh(&inst->lock); qthreshold = inst->qthreshold; /* per-rule qthreshold overrides per-instance */ 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 == 0 || inst->copy_range > skb->len) data_len = skb->len; else data_len = inst->copy_range; size += NFA_SPACE(data_len); UDEBUG("copy_packet, therefore size now %u\n", size); break; default: spin_unlock_bh(&inst->lock); instance_put(inst); return; } if (size > inst->nlbufsiz) nlbufsiz = size; else nlbufsiz = inst->nlbufsiz; if (!inst->skb) { if (!(inst->skb = nfulnl_alloc_skb(nlbufsiz, size))) { UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n", inst->nlbufsiz, size); goto alloc_failure; } } else if (inst->qlen >= qthreshold || 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. */ UDEBUG("flushing old skb\n"); __nfulnl_send(inst); if (!(inst->skb = nfulnl_alloc_skb(nlbufsiz, size))) { UDEBUG("error in nfulnl_alloc_skb(%u, %u)\n", inst->nlbufsiz, size); goto alloc_failure; } } UDEBUG("qlen %d, qthreshold %d\n", inst->qlen, qthreshold); inst->qlen++; __build_packet_message(inst, skb, data_len, pf, hooknum, in, out, li, prefix); /* timer_pending always called within inst->lock, so there * is no chance of a race here */ if (!timer_pending(&inst->timer)) { instance_get(inst); inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100); add_timer(&inst->timer); } spin_unlock_bh(&inst->lock); return; alloc_failure: spin_unlock_bh(&inst->lock); instance_put(inst); UDEBUG("error allocating skb\n"); /* FIXME: statistics */ } static int nfulnl_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr) { struct netlink_notify *n = ptr; if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER && n->pid) { int i; /* destroy all instances for this pid */ write_lock_bh(&instances_lock); for (i = 0; i < INSTANCE_BUCKETS; i++) { struct hlist_node *tmp, *t2; struct nfulnl_instance *inst; struct hlist_head *head = &instance_table[i]; hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) { UDEBUG("node = %p\n", inst); if (n->pid == inst->peer_pid) __instance_destroy(inst); } } write_unlock_bh(&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, struct nlmsghdr *nlh, struct nfattr *nfqa[], int *errp) { return -ENOTSUPP; } static struct nf_logger nfulnl_logger = { .name = "nfnetlink_log", .logfn = &nfulnl_log_packet, .me = THIS_MODULE, }; static const int nfula_min[NFULA_MAX] = { [NFULA_PACKET_HDR-1] = sizeof(struct nfulnl_msg_packet_hdr), [NFULA_MARK-1] = sizeof(u_int32_t), [NFULA_TIMESTAMP-1] = sizeof(struct nfulnl_msg_packet_timestamp), [NFULA_IFINDEX_INDEV-1] = sizeof(u_int32_t), [NFULA_IFINDEX_OUTDEV-1]= sizeof(u_int32_t), [NFULA_HWADDR-1] = sizeof(struct nfulnl_msg_packet_hw), [NFULA_PAYLOAD-1] = 0, [NFULA_PREFIX-1] = 0, [NFULA_UID-1] = sizeof(u_int32_t), }; static const int nfula_cfg_min[NFULA_CFG_MAX] = { [NFULA_CFG_CMD-1] = sizeof(struct nfulnl_msg_config_cmd), [NFULA_CFG_MODE-1] = sizeof(struct nfulnl_msg_config_mode), [NFULA_CFG_TIMEOUT-1] = sizeof(u_int32_t), [NFULA_CFG_QTHRESH-1] = sizeof(u_int32_t), [NFULA_CFG_NLBUFSIZ-1] = sizeof(u_int32_t), }; static int nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, struct nlmsghdr *nlh, struct nfattr *nfula[], int *errp) { struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); u_int16_t group_num = ntohs(nfmsg->res_id); struct nfulnl_instance *inst; int ret = 0; UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type)); if (nfattr_bad_size(nfula, NFULA_CFG_MAX, nfula_cfg_min)) { UDEBUG("bad attribute size\n"); return -EINVAL; } inst = instance_lookup_get(group_num); if (nfula[NFULA_CFG_CMD-1]) { u_int8_t pf = nfmsg->nfgen_family; struct nfulnl_msg_config_cmd *cmd; cmd = NFA_DATA(nfula[NFULA_CFG_CMD-1]); UDEBUG("found CFG_CMD for\n"); switch (cmd->command) { case NFULNL_CFG_CMD_BIND: if (inst) { ret = -EBUSY; goto out_put; } inst = instance_create(group_num, NETLINK_CB(skb).pid); if (!inst) { ret = -EINVAL; goto out_put; } break; case NFULNL_CFG_CMD_UNBIND: if (!inst) { ret = -ENODEV; goto out_put; } if (inst->peer_pid != NETLINK_CB(skb).pid) { ret = -EPERM; goto out_put; } instance_destroy(inst); break; case NFULNL_CFG_CMD_PF_BIND: UDEBUG("registering log handler for pf=%u\n", pf); ret = nf_log_register(pf, &nfulnl_logger); break; case NFULNL_CFG_CMD_PF_UNBIND: UDEBUG("unregistering log handler for pf=%u\n", pf); /* This is a bug and a feature. We cannot unregister * other handlers, like nfnetlink_inst can */ nf_log_unregister_pf(pf); break; default: ret = -EINVAL; break; } } else { if (!inst) { UDEBUG("no config command, and no instance for " "group=%u pid=%u =>ENOENT\n", group_num, NETLINK_CB(skb).pid); ret = -ENOENT; goto out_put; } if (inst->peer_pid != NETLINK_CB(skb).pid) { UDEBUG("no config command, and wrong pid\n"); ret = -EPERM; goto out_put; } } if (nfula[NFULA_CFG_MODE-1]) { struct nfulnl_msg_config_mode *params; params = NFA_DATA(nfula[NFULA_CFG_MODE-1]); nfulnl_set_mode(inst, params->copy_mode, ntohs(params->copy_range)); } if (nfula[NFULA_CFG_TIMEOUT-1]) { u_int32_t timeout = *(u_int32_t *)NFA_DATA(nfula[NFULA_CFG_TIMEOUT-1]); nfulnl_set_timeout(inst, ntohl(timeout)); } if (nfula[NFULA_CFG_NLBUFSIZ-1]) { u_int32_t nlbufsiz = *(u_int32_t *)NFA_DATA(nfula[NFULA_CFG_NLBUFSIZ-1]); nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); } if (nfula[NFULA_CFG_QTHRESH-1]) { u_int32_t qthresh = *(u_int16_t *)NFA_DATA(nfula[NFULA_CFG_QTHRESH-1]); nfulnl_set_qthresh(inst, ntohl(qthresh)); } out_put: instance_put(inst); return ret; } static 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, }, }; static 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 { unsigned int bucket; }; static struct hlist_node *get_first(struct seq_file *seq) { struct iter_state *st = seq->private; if (!st) return NULL; for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) { if (!hlist_empty(&instance_table[st->bucket])) return 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; h = h->next; while (!h) { if (++st->bucket >= INSTANCE_BUCKETS) return NULL; h = 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 *seq, loff_t *pos) { read_lock_bh(&instances_lock); return get_idx(seq, *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) { read_unlock_bh(&instances_lock); } 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_pid, inst->qlen, inst->copy_mode, inst->copy_range, inst->flushtimeout, atomic_read(&inst->use)); } static 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) { struct seq_file *seq; struct iter_state *is; int ret; is = kzalloc(sizeof(*is), GFP_KERNEL); if (!is) return -ENOMEM; ret = seq_open(file, &nful_seq_ops); if (ret < 0) goto out_free; seq = file->private_data; seq->private = is; return ret; out_free: kfree(is); return ret; } static struct file_operations nful_file_ops = { .owner = THIS_MODULE, .open = nful_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private, }; #endif /* PROC_FS */ static int init_or_cleanup(int init) { int i, status = -ENOMEM; #ifdef CONFIG_PROC_FS struct proc_dir_entry *proc_nful; #endif if (!init) goto cleanup; for (i = 0; i < INSTANCE_BUCKETS; i++) INIT_HLIST_HEAD(&instance_table[i]); /* it's not really all that important to have a random value, so * we can do this from the init function, even if there hasn't * been that much entropy yet */ get_random_bytes(&hash_init, sizeof(hash_init)); netlink_register_notifier(&nfulnl_rtnl_notifier); status = nfnetlink_subsys_register(&nfulnl_subsys); if (status < 0) { printk(KERN_ERR "log: failed to create netlink socket\n"); goto cleanup_netlink_notifier; } #ifdef CONFIG_PROC_FS proc_nful = create_proc_entry("nfnetlink_log", 0440, proc_net_netfilter); if (!proc_nful) goto cleanup_subsys; proc_nful->proc_fops = &nful_file_ops; #endif return status; cleanup: nf_log_unregister_logger(&nfulnl_logger); #ifdef CONFIG_PROC_FS remove_proc_entry("nfnetlink_log", proc_net_netfilter); cleanup_subsys: #endif nfnetlink_subsys_unregister(&nfulnl_subsys); cleanup_netlink_notifier: netlink_unregister_notifier(&nfulnl_rtnl_notifier); return status; } static int __init init(void) { return init_or_cleanup(1); } static void __exit fini(void) { init_or_cleanup(0); } MODULE_DESCRIPTION("netfilter userspace logging"); MODULE_AUTHOR("Harald Welte "); MODULE_LICENSE("GPL"); MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG); module_init(init); module_exit(fini);