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/*
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* Copyright (c) 2001-2020 Mellanox Technologies, Ltd. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _IP_FRAG_H
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#define _IP_FRAG_H
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/**
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* IP reassembly is based on algorithm described in RFC815
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*/
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#include <map>
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#include <netinet/ip.h>
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#include <netinet/udp.h>
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#include <sys/time.h>
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#include "vlogger/vlogger.h"
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#include "utils/lock_wrapper.h"
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#include <vma/util/vtypes.h>
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#include <vma/util/sys_vars.h>
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#include <vma/event/timer_handler.h>
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#include <vma/dev/buffer_pool.h>
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class mem_buf_desc_t;
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class event_handler_manager;
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class mem_buf_desc_owner;
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#define IP_FRAG_FREED ((size_t)-1)
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#define IP_FRAG_MAX_DESC 1024 /* maximum number of preallocated descriptors */
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#define IP_FRAG_MAX_HOLES 16000 /* maximum number of preallocated holes */
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#define IP_FRAG_TTL 2 /* default unassembled fragment time to live in ticks */
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#define IP_FRAG_INF 0xFFFF
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#define IP_FRAG_NINF 0x0
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#define IP_FRAG_SPACE 60000
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#define IP_FRAG_CLEANUP_INT 10
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struct ip_frag_key_t {
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uint16_t ip_id;
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in_addr_t src_ip;
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in_addr_t dst_ip;
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uint8_t ipproto;
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};
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inline bool
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operator<( ip_frag_key_t const& a, ip_frag_key_t const& b)
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{
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if (a.ip_id < b.ip_id)
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return true;
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if (a.ip_id > b.ip_id)
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return false;
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if (a.src_ip < b.src_ip)
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return true;
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if (a.src_ip > b.src_ip)
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return false;
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if (a.dst_ip < b.dst_ip)
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return true;
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if (a.dst_ip > b.dst_ip)
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return false;
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if (a.ipproto < b.ipproto)
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return true;
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if (a.ipproto > b.ipproto)
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return false;
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return false;
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}
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struct ip_frag_hole_desc {
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uint16_t first;
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uint16_t last;
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mem_buf_desc_t *data_first;
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mem_buf_desc_t *data_last;
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struct ip_frag_hole_desc *next;
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};
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typedef struct ip_frag_desc {
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uint16_t ttl;
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uint16_t pkt_size;
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struct ip_frag_hole_desc *hole_list;
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mem_buf_desc_t *frag_list;
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int64_t frag_counter;
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struct ip_frag_desc *next;
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} ip_frag_desc_t;
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typedef std::map<ip_frag_key_t, ip_frag_desc_t *, std::less<ip_frag_key_t> > ip_frags_list_t;
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typedef std::map<ring_slave*, mem_buf_desc_t*> owner_desc_map_t;
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class ip_frag_manager : private lock_spin, public timer_handler
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{
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public:
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ip_frag_manager();
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~ip_frag_manager();
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/**
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* add fragment to the list.
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* Return:
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* 0 if finished OK
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* - if the packet is complete - put the pointer to the first fragment of the packet in ret.
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* Rest of the packet fragments are linked in order.
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* - if we need more fragments - put NULL in ret.
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* -1 if finished with error and this packet needs to be droped
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*/
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int add_frag(iphdr *hdr, mem_buf_desc_t *frag, mem_buf_desc_t **ret);
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uint64_t m_frag_counter;
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private:
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ip_frags_list_t m_frags;
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// Map of buffers to return, by owner
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owner_desc_map_t m_return_descs;
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/**
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* first fragment for given address is detected - setup
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*/
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ip_frag_desc_t* new_frag_desc(ip_frag_key_t &key);
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void print_statistics();
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void return_buffers_to_owners(const owner_desc_map_t &buff_map);
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void free_frag(mem_buf_desc_t *frag);
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ip_frag_hole_desc* alloc_hole_desc();
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void free_hole_desc(struct ip_frag_hole_desc *p);
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ip_frag_desc_t* alloc_frag_desc();
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void free_frag_desc(ip_frag_desc_t *p);
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void destroy_frag_desc(ip_frag_desc_t *desc);
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virtual void handle_timer_expired(void* user_data);
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void free_frag_resources(void);
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};
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extern ip_frag_manager * g_p_ip_frag_manager;
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#endif
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