static void
__instance_destroy(struct nfulnl_instance *inst)
{
/* first pull it out of the global list */
hlist_del(&inst->hlist);
/* then flush all pending packets from skb */
spin_lock_bh(&inst->lock);
if (inst->skb)
__nfulnl_flush(inst);
spin_unlock_bh(&inst->lock);
/* and finally put the refcount */
instance_put(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);
}
/* 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)
{
size_t size;
unsigned int 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);
const struct nfnl_ct_hook *nfnl_ct = NULL;
struct nf_conn *ct = NULL;
enum ip_conntrack_info uninitialized_var(ctinfo);
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 */
#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)) /* 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));
if (inst->flags & NFULNL_CFG_F_CONNTRACK) {
nfnl_ct = rcu_dereference(nfnl_ct_hook);
if (nfnl_ct != NULL) {
ct = nfnl_ct->get_ct(skb, &ctinfo);
if (ct != NULL)
size += nfnl_ct->build_size(ct);
}
}
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:
data_len = inst->copy_range;
if ((li->u.ulog.flags & NF_LOG_F_COPY_LEN) &&
(li->u.ulog.copy_len < data_len))
data_len = li->u.ulog.copy_len;
if (data_len > skb->len)
data_len = skb->len;
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,
nfnl_ct, ct, ctinfo);
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;
}
/* log handler for internal netfilter logging api */
void
nfulnl_log_packet(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;
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)
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_SPACE(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));
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 (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 += nla_total_size(data_len);
break;
default:
goto unlock_and_release;
}
if (inst->skb &&
size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) {
/* 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(inst->nlbufsiz, size);
if (!inst->skb)
goto alloc_failure;
}
inst->qlen++;
__build_packet_message(inst, skb, data_len, pf,
hooknum, in, out, li, 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;
}