tcp_rbtree_insert identifier - Linux source code next-20260811

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linux

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FIXME
- FIXME
  - next-20260811

Defined in 1 files as a prototype:

include/net/tcp.h, line 2309 (as a prototype)

Defined in 1 files as a function:

net/ipv4/tcp_output.c, line 64 (as a function)

Referenced in 2 files:

Smatch caller information:

net/ipv4/tcp_input.c tcp_collapse() -> tcp_rbtree_insert()

Type	Parameter	Key	Value
PARAM_VALUE	0	root	0,4096-ptr_max
PARAM_VALUE	0	root->rb_node	1-u64max
PARAM_VALUE	1	skb	4096-5923856135255236607,5923856135255236609-ptr_max
PARAM_VALUE	1	skb->cb	4096-ptr_max
DATA_SOURCE	0	root	$2
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
UNITS	1	skb	unit_byte
HALF_LOCKED2		&sk->sk_lock.slock
HALF_LOCKED2		sk

net/ipv4/tcp_output.c tcp_connect() -> tcp_rbtree_insert()

Type	Parameter	Key	Value
PARAM_VALUE	0	root	4096-ptr_max
PARAM_VALUE	0	root->rb_node	0,4096-ptr_max
PARAM_VALUE	1	skb	4096-ptr_max
PARAM_VALUE	1	skb->data	4096-ptr_max
PARAM_VALUE	1	skb->decrypted	1
PARAM_VALUE	1	skb->ip_summed	3
PARAM_VALUE	1	skb->nohdr	1
PARAM_VALUE	1	skb->tcp_tsorted_anchor.next	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.next->next	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.prev	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.prev->next	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.prev->prev	4096-ptr_max
BUF_SIZE	1	skb	320
BUF_SIZE	1	skb	320
DATA_SOURCE	1	skb	r tcp_stream_alloc_skb
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
HALF_LOCKED2		sk

net/ipv4/tcp_output.c tcp_event_new_data_sent() -> tcp_rbtree_insert()

Type	Parameter	Key	Value
PARAM_VALUE	0	root	4096-ptr_max
PARAM_VALUE	1	skb	4096-ptr_max
PARAM_VALUE	1	skb->cb	4096-ptr_max
PARAM_VALUE	1	skb->csum_offset	16
PARAM_VALUE	1	skb->data->check	0
PARAM_VALUE	1	skb->dev->ethtool_ops->get_link_ext_state	0-s64max
PARAM_VALUE	1	skb->dev->ethtool_ops->get_mm_stats	0-s64max
PARAM_VALUE	1	skb->dev->ethtool_ops->rxfh_max_num_contexts	0-4294967295
PARAM_VALUE	1	skb->dev->ethtool_ops->supported_coalesce_params	0-s64max
PARAM_VALUE	1	skb->dev->l3mdev_ops	4096-ptr_max
PARAM_VALUE	1	skb->dev->nd_net.net->ipv4.fqdir->f->frag_expire	0,663510801442193408,1753052602134376448,4007388366431105024,8876081723503042560
PARAM_VALUE	1	skb->dev->nd_net.net->ipv4.fqdir->f->qsize	0,304,320
PARAM_VALUE	1	skb->dev->ndisc_ops->fill_addr_option	4096-ptr_max
PARAM_VALUE	1	skb->dev->ndisc_ops->parse_options	4096-ptr_max
PARAM_VALUE	1	skb->dev->ndisc_ops->update	4096-ptr_max
PARAM_VALUE	1	skb->dev->rtnl_link_ops->maxtype	0-6,8-10,15,18,20,22,24,34,50
PARAM_VALUE	1	skb->dev->rtnl_link_ops->priv_size	0,8,32,40,48,56,88,112,120,144,160,224,240,256,296,616,624,728,736,744,1056,1128,1336,1616,2176,2240,2272,2560,3296,3544,3552,3720,9688-u64max
PARAM_VALUE	1	skb->next	0
PARAM_VALUE	1	skb->prev	0
PARAM_VALUE	1	skb->sk->__sk_common.skc_net.net->xfrm.nat_keepalive_work.wq->dfl_pwq	0-s64max
PARAM_VALUE	1	skb->sk->__sk_common.skc_net.net->xfrm.nat_keepalive_work.wq->saved_max_active	s32min-s32max
PARAM_VALUE	1	skb->sk->__sk_common.skc_net.net->xfrm.nat_keepalive_work.wq->saved_min_active	s32min-s32max
PARAM_VALUE	1	skb->sk->ns_tracker->alloc_stack_handle	0-4294967295
PARAM_VALUE	1	skb->sk->ns_tracker->dead	0-1
PARAM_VALUE	1	skb->sk->ns_tracker->free_stack_handle	0-4294967295
PARAM_VALUE	1	skb->sk->sk_callback_lock.owner	(-1)
PARAM_VALUE	1	skb->sk->sk_callback_lock.owner_cpu	u32max
PARAM_VALUE	1	skb->sk->sk_callback_lock.raw_lock.cnts.counter	0-s32max
PARAM_VALUE	1	skb->sk->sk_filter->rcu.func	1-u64max
PARAM_VALUE	1	skb->sk->sk_rcu.func	1-u64max
PARAM_VALUE	1	skb->sk->sk_rcu.next	0
PARAM_VALUE	1	skb->sk->sk_user_data	0
PARAM_VALUE	1	*skb->cb	0-255
PARAM_VALUE	1	*skb->dev->name	0-255
BUF_SIZE	1	skb	(-1),320
BUF_SIZE	1	skb	(-1),320
CAPPED_DATA	1	skb	1
DATA_SOURCE	1	skb	$1
MEM_ZERO	1	skb->cb
PREEMPT_ADD
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
HOST_DATA	1	skb->data_len	0-u32max[c]
HOST_DATA	1	skb->inner_protocol	1-255
HOST_DATA	1	skb->len	0-u32max[c]
HOST_DATA	1	skb->next->prev->csum_offset	0-u16max
HOST_DATA	1	skb->next->prev->data_len	0-u32max[c]
HOST_DATA	1	skb->next->prev->len	1-u32max[c]
HOST_DATA	1	skb->next->prev->tstamp	500000002-4294967299794967295[c]
HOST_DATA	1	skb->prev->csum_offset	0-u16max
HOST_DATA	1	skb->prev->data_len	0-u32max[c]
HOST_DATA	1	skb->prev->len	1-u32max[c]
HOST_DATA	1	skb->prev->tstamp	500000002-4294967299794967295[c]
HOST_DATA	1	skb->truesize	0-u32max
HOST_DATA	1	skb->tstamp	500000002-4294967299794967295[c]
HOST_DATA	1	skb->users.refs.counter	s32min-0,2-s32max
HOST_DATA	1	*skb->data	0-255
HALF_LOCKED2		&sk->sk_lock.slock

net/ipv4/tcp_output.c tcp_insert_write_queue_after() -> tcp_rbtree_insert()

Type	Parameter	Key	Value
PARAM_VALUE	0	root	4096-ptr_max
PARAM_VALUE	1	skb	4096-ptr_max
PARAM_VALUE	1	skb->cb	4096-ptr_max
PARAM_VALUE	1	skb->data	4096-ptr_max
PARAM_VALUE	1	skb->ip_summed	3
PARAM_VALUE	1	skb->nohdr	1
PARAM_VALUE	1	skb->tcp_tsorted_anchor.next	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.next->next	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.prev	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.prev->next	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.prev->prev	4096-ptr_max
PARAM_VALUE	1	skb->tstamp_type	0-1
BUF_SIZE	1	skb	320
BUF_SIZE	1	skb	320
CAPPED_DATA	1	skb->len	1
DATA_SOURCE	1	skb	$1
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
NO_OVERFLOW_SIMPLE	1	skb->data_len
NO_OVERFLOW_SIMPLE	1	skb->len
HALF_LOCKED2		&sk->sk_lock.slock
HALF_LOCKED2		sk

net/ipv4/tcp_output.c tcp_send_syn_data() -> tcp_rbtree_insert()

Type	Parameter	Key	Value
PARAM_VALUE	0	root	4096-ptr_max
PARAM_VALUE	0	root->rb_node	4096-ptr_max
PARAM_VALUE	1	skb	4096-ptr_max
PARAM_VALUE	1	skb->cb	4096-ptr_max
PARAM_VALUE	1	skb->csum_offset	16
PARAM_VALUE	1	skb->data->check	0
PARAM_VALUE	1	skb->data->urg	1
PARAM_VALUE	1	skb->dev->ip6_ptr->mc_query_work.wq->dfl_pwq	0-s64max
PARAM_VALUE	1	skb->dev->ip6_ptr->mc_query_work.wq->saved_max_active	s32min-s32max
PARAM_VALUE	1	skb->dev->ip6_ptr->mc_query_work.wq->saved_min_active	s32min-s32max
PARAM_VALUE	1	skb->dev->ip6_ptr->mc_report_work.wq->dfl_pwq	0-s64max
PARAM_VALUE	1	skb->dev->ip6_ptr->mc_report_work.wq->saved_max_active	s32min-s32max
PARAM_VALUE	1	skb->dev->ip6_ptr->mc_report_work.wq->saved_min_active	s32min-s32max
PARAM_VALUE	1	skb->dev->ip6_ptr->stats.proc_dir_entry	0,4806605944481423360
PARAM_VALUE	1	skb->dev->l3mdev_ops	4096-ptr_max
PARAM_VALUE	1	skb->dev->linkwatch_dev_tracker->alloc_stack_handle	0-4294967295
PARAM_VALUE	1	skb->dev->linkwatch_dev_tracker->free_stack_handle	0-4294967295
PARAM_VALUE	1	skb->dev->nd_net.net->ipv4.fqdir->f->frag_expire	0,663510801442193408,1753052602134376448,4007388366431105024,8876081723503042560
PARAM_VALUE	1	skb->dev->nd_net.net->ipv4.fqdir->f->qsize	0,304,320
PARAM_VALUE	1	skb->dev->ndisc_ops->fill_addr_option	4096-ptr_max
PARAM_VALUE	1	skb->dev->ndisc_ops->parse_options	4096-ptr_max
PARAM_VALUE	1	skb->dev->ndisc_ops->update	4096-ptr_max
PARAM_VALUE	1	skb->dev->rtnl_link_ops->maxtype	0-6,8-10,15,18,20,22,24,34,50
PARAM_VALUE	1	skb->dev->rtnl_link_ops->priv_size	0,8,32,40,48,56,88,112,120,144,160,224,240,256,296,616,624,728,736,744,1056,1128,1336,1616,2176,2240,2272,2560,3296,3544,3552,3720,9688-u64max
PARAM_VALUE	1	skb->ignore_df	0
PARAM_VALUE	1	skb->ip_summed	3
PARAM_VALUE	1	skb->next->sk->ns_tracker->alloc_stack_handle	0-4294967295
PARAM_VALUE	1	skb->next->sk->ns_tracker->dead	0-1
PARAM_VALUE	1	skb->next->sk->ns_tracker->free_stack_handle	0-4294967295
PARAM_VALUE	1	skb->sk->__sk_common.skc_net.net->notrefcnt_tracker.dead	1
PARAM_VALUE	1	skb->sk->__sk_common.skc_net.net->notrefcnt_tracker.quarantine.prev	4096-ptr_max
PARAM_VALUE	1	skb->sk->__sk_common.skc_net.net->refcnt_tracker.dead	1
PARAM_VALUE	1	skb->sk->__sk_common.skc_net.net->xfrm.nat_keepalive_work.wq->dfl_pwq	0-s64max
PARAM_VALUE	1	skb->sk->__sk_common.skc_net.net->xfrm.nat_keepalive_work.wq->saved_max_active	s32min-s32max
PARAM_VALUE	1	skb->sk->__sk_common.skc_net.net->xfrm.nat_keepalive_work.wq->saved_min_active	s32min-s32max
PARAM_VALUE	1	skb->sk->__sk_common.skc_refcnt.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	1	skb->sk->ns_tracker->alloc_stack_handle	0-4294967295
PARAM_VALUE	1	skb->sk->ns_tracker->dead	0-1
PARAM_VALUE	1	skb->sk->ns_tracker->free_stack_handle	0-4294967295
PARAM_VALUE	1	skb->sk->sk_bpf_storage->owner_refcnt.refs.counter	s32min-s32max
PARAM_VALUE	1	skb->sk->sk_callback_lock.owner	(-1)
PARAM_VALUE	1	skb->sk->sk_callback_lock.owner_cpu	u32max
PARAM_VALUE	1	skb->sk->sk_callback_lock.raw_lock.cnts.counter	0-s32max
PARAM_VALUE	1	skb->sk->sk_filter->rcu.func	1-u64max
PARAM_VALUE	1	skb->sk->sk_owner->refcnt.counter	0-s32max
PARAM_VALUE	1	skb->sk->sk_prot_creator->owner->refcnt.counter	0-s32max
PARAM_VALUE	1	skb->sk->sk_rcu.func	1-u64max
PARAM_VALUE	1	skb->sk->sk_rcu.next	0
PARAM_VALUE	1	skb->sk->sk_reuseport_cb->rcu.func	1-u64max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.next	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.next->next	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.next->prev	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.prev->next	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.prev->prev	4096-ptr_max
PARAM_VALUE	1	*skb->cb	0-255
PARAM_VALUE	1	*skb->dev->name	0-255
BUF_SIZE	1	skb	320
BUF_SIZE	1	skb	320
CAPPED_DATA	1	skb	1
DATA_SOURCE	1	skb	r tcp_stream_alloc_skb
MEM_ZERO	1	skb->cb
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
HALF_LOCKED2		sk
HALF_LOCKED2		sk

net/ipv4/tcp_output.c tcp_send_synack() -> tcp_rbtree_insert()

Type	Parameter	Key	Value
PARAM_VALUE	0	root	4096-ptr_max
PARAM_VALUE	0	root->rb_node	4096-ptr_max
PARAM_VALUE	1	skb	4096-ptr_max
PARAM_VALUE	1	skb->_sk_redir	0
PARAM_VALUE	1	skb->alloc_cpu	0
PARAM_VALUE	1	skb->cloned	0
PARAM_VALUE	1	skb->csum	0
PARAM_VALUE	1	skb->csum_complete_sw	0
PARAM_VALUE	1	skb->csum_level	0
PARAM_VALUE	1	skb->csum_not_inet	0
PARAM_VALUE	1	skb->csum_offset	0
PARAM_VALUE	1	skb->csum_start	0
PARAM_VALUE	1	skb->csum_valid	0
PARAM_VALUE	1	skb->data	4096-ptr_max
PARAM_VALUE	1	skb->data_len	0
PARAM_VALUE	1	skb->decrypted	0
PARAM_VALUE	1	skb->destructor	0
PARAM_VALUE	1	skb->dev_scratch	0
PARAM_VALUE	1	skb->dst_pending_confirm	0
PARAM_VALUE	1	skb->encap_hdr_csum	0
PARAM_VALUE	1	skb->encapsulation	0
PARAM_VALUE	1	skb->end	0
PARAM_VALUE	1	skb->extensions	4096-ptr_max
PARAM_VALUE	1	skb->fclone	0-1
PARAM_VALUE	1	skb->from_ingress	0
PARAM_VALUE	1	skb->hash	0
PARAM_VALUE	1	skb->hdr_len	0
PARAM_VALUE	1	skb->head	1-u64max
PARAM_VALUE	1	skb->head_frag	0
PARAM_VALUE	1	skb->headers.alloc_cpu	0
PARAM_VALUE	1	skb->headers.csum	0
PARAM_VALUE	1	skb->headers.csum_complete_sw	0
PARAM_VALUE	1	skb->headers.csum_level	0
PARAM_VALUE	1	skb->headers.csum_not_inet	0
PARAM_VALUE	1	skb->headers.csum_offset	0
PARAM_VALUE	1	skb->headers.csum_start	0
PARAM_VALUE	1	skb->headers.csum_valid	0
PARAM_VALUE	1	skb->headers.decrypted	0
PARAM_VALUE	1	skb->headers.dst_pending_confirm	0
PARAM_VALUE	1	skb->headers.encap_hdr_csum	0
PARAM_VALUE	1	skb->headers.encapsulation	0
PARAM_VALUE	1	skb->headers.from_ingress	0
PARAM_VALUE	1	skb->headers.hash	0
PARAM_VALUE	1	skb->headers.ignore_df	0
PARAM_VALUE	1	skb->headers.inner_ipproto	0
PARAM_VALUE	1	skb->headers.inner_mac_header	0
PARAM_VALUE	1	skb->headers.inner_network_header	0
PARAM_VALUE	1	skb->headers.inner_protocol	0
PARAM_VALUE	1	skb->headers.inner_protocol_type	0
PARAM_VALUE	1	skb->headers.inner_transport_header	0
PARAM_VALUE	1	skb->headers.ip_summed	0
PARAM_VALUE	1	skb->headers.ipvs_property	0
PARAM_VALUE	1	skb->headers.kcov_handle.val	0
PARAM_VALUE	1	skb->headers.l4_hash	0
PARAM_VALUE	1	skb->headers.mac_header	0
PARAM_VALUE	1	skb->headers.mark	0
PARAM_VALUE	1	skb->headers.napi_id	0
PARAM_VALUE	1	skb->headers.ndisc_nodetype	0
PARAM_VALUE	1	skb->headers.network_header	0
PARAM_VALUE	1	skb->headers.nf_skip_egress	0
PARAM_VALUE	1	skb->headers.nf_trace	0
PARAM_VALUE	1	skb->headers.no_fcs	0
PARAM_VALUE	1	skb->headers.offload_fwd_mark	0
PARAM_VALUE	1	skb->headers.offload_l3_fwd_mark	0
PARAM_VALUE	1	skb->headers.ooo_okay	0
PARAM_VALUE	1	skb->headers.pkt_type	0
PARAM_VALUE	1	skb->headers.priority	0
PARAM_VALUE	1	skb->headers.protocol	0
PARAM_VALUE	1	skb->headers.redirected	0
PARAM_VALUE	1	skb->headers.remcsum_offload	0
PARAM_VALUE	1	skb->headers.reserved_tailroom	0
PARAM_VALUE	1	skb->headers.secmark	0
PARAM_VALUE	1	skb->headers.sender_cpu	0
PARAM_VALUE	1	skb->headers.skb_iif	0
PARAM_VALUE	1	skb->headers.slow_gro	0
PARAM_VALUE	1	skb->headers.sw_hash	0
PARAM_VALUE	1	skb->headers.tc_at_ingress	0
PARAM_VALUE	1	skb->headers.tc_depth	0
PARAM_VALUE	1	skb->headers.tc_index	0
PARAM_VALUE	1	skb->headers.tc_skip_classify	0
PARAM_VALUE	1	skb->headers.transport_header	0
PARAM_VALUE	1	skb->headers.tstamp_type	0
PARAM_VALUE	1	skb->headers.unreadable	0
PARAM_VALUE	1	skb->headers.vlan_all	0
PARAM_VALUE	1	skb->headers.vlan_proto	0
PARAM_VALUE	1	skb->headers.vlan_tci	0
PARAM_VALUE	1	skb->headers.wifi_acked	0
PARAM_VALUE	1	skb->headers.wifi_acked_valid	0
PARAM_VALUE	1	skb->ignore_df	0
PARAM_VALUE	1	skb->inner_ipproto	0
PARAM_VALUE	1	skb->inner_mac_header	0
PARAM_VALUE	1	skb->inner_network_header	0
PARAM_VALUE	1	skb->inner_protocol	0
PARAM_VALUE	1	skb->inner_protocol_type	0
PARAM_VALUE	1	skb->inner_transport_header	0
PARAM_VALUE	1	skb->ip_summed	0
PARAM_VALUE	1	skb->ipvs_property	0
PARAM_VALUE	1	skb->kcov_handle.val	0
PARAM_VALUE	1	skb->l4_hash	0
PARAM_VALUE	1	skb->list.next	0
PARAM_VALUE	1	skb->list.prev	0
PARAM_VALUE	1	skb->ll_node.next	0
PARAM_VALUE	1	skb->mac_header	u16max
PARAM_VALUE	1	skb->mac_len	0
PARAM_VALUE	1	skb->mark	0
PARAM_VALUE	1	skb->napi_id	0
PARAM_VALUE	1	skb->ndisc_nodetype	0
PARAM_VALUE	1	skb->network_header	0
PARAM_VALUE	1	skb->next	0
PARAM_VALUE	1	skb->nf_skip_egress	0
PARAM_VALUE	1	skb->nf_trace	0
PARAM_VALUE	1	skb->no_fcs	0
PARAM_VALUE	1	skb->nohdr	1
PARAM_VALUE	1	skb->offload_fwd_mark	0
PARAM_VALUE	1	skb->offload_l3_fwd_mark	0
PARAM_VALUE	1	skb->ooo_okay	0
PARAM_VALUE	1	skb->peeked	0
PARAM_VALUE	1	skb->pkt_type	0
PARAM_VALUE	1	skb->pp_recycle	0
PARAM_VALUE	1	skb->prev	0
PARAM_VALUE	1	skb->priority	0
PARAM_VALUE	1	skb->protocol	0
PARAM_VALUE	1	skb->rbnode.__rb_parent_color	0
PARAM_VALUE	1	skb->rbnode.rb_left	0
PARAM_VALUE	1	skb->rbnode.rb_right	0
PARAM_VALUE	1	skb->redirected	0
PARAM_VALUE	1	skb->remcsum_offload	0
PARAM_VALUE	1	skb->reserved_tailroom	0
PARAM_VALUE	1	skb->secmark	0
PARAM_VALUE	1	skb->sender_cpu	0
PARAM_VALUE	1	skb->sk	0
PARAM_VALUE	1	skb->skb_iif	0
PARAM_VALUE	1	skb->sw_hash	0
PARAM_VALUE	1	skb->tc_at_ingress	0
PARAM_VALUE	1	skb->tc_depth	0
PARAM_VALUE	1	skb->tc_index	0
PARAM_VALUE	1	skb->tc_skip_classify	0
PARAM_VALUE	1	skb->tcp_tsorted_anchor.next	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.next->next	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.next->prev	0
PARAM_VALUE	1	skb->tcp_tsorted_anchor.prev	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.prev->next	4096-ptr_max
PARAM_VALUE	1	skb->tcp_tsorted_anchor.prev->prev	4096-ptr_max
PARAM_VALUE	1	skb->transport_header	u16max
PARAM_VALUE	1	skb->truesize	0
PARAM_VALUE	1	skb->tstamp_type	0
PARAM_VALUE	1	skb->unreadable	0
PARAM_VALUE	1	skb->users.refs.counter	1
PARAM_VALUE	1	skb->vlan_all	0
PARAM_VALUE	1	skb->vlan_proto	0
PARAM_VALUE	1	skb->vlan_tci	0
PARAM_VALUE	1	skb->wifi_acked	0
PARAM_VALUE	1	skb->wifi_acked_valid	0
PARAM_VALUE	1	*skb->cb	0-255
BUF_SIZE	1	skb	0-s32max
BUF_SIZE	1	skb	0-s32max
DATA_SOURCE	1	skb	r skb_copy
NOCHECK_CALL
NO_OVERFLOW_SIMPLE	1	skb->dev->proto_down
NO_OVERFLOW_SIMPLE	1	skb->end