inet.hh revision 9955:5d8722ab804b 
1/*
2 * Copyright (c) 2013 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2002-2005 The Regents of The University of Michigan
15 * Copyright (c) 2010 Advanced Micro Devices, Inc.
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are
20 * met: redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer;
22 * redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution;
25 * neither the name of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from
27 * this software without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Authors: Nathan Binkert
42 *          Steve Reinhardt
43 *          Gabe Black
44 *          Geoffrey Blake
45 */
46
47#ifndef __BASE_INET_HH__
48#define __BASE_INET_HH__
49
50#include <iosfwd>
51#include <string>
52#include <utility>
53#include <vector>
54
55#include "base/types.hh"
56#include "dev/etherpkt.hh"
57#include "dnet/os.h"
58#include "dnet/eth.h"
59#include "dnet/ip.h"
60#include "dnet/ip6.h"
61#include "dnet/addr.h"
62#include "dnet/arp.h"
63#include "dnet/icmp.h"
64#include "dnet/tcp.h"
65#include "dnet/udp.h"
66#include "dnet/intf.h"
67#include "dnet/route.h"
68#include "dnet/fw.h"
69#include "dnet/blob.h"
70#include "dnet/rand.h"
71
72namespace Net {
73
74/*
75 * Ethernet Stuff
76 */
77struct EthAddr : protected eth_addr
78{
79  protected:
80    void parse(const std::string &addr);
81
82  public:
83    EthAddr();
84    EthAddr(const uint8_t ea[ETH_ADDR_LEN]);
85    EthAddr(const eth_addr &ea);
86    EthAddr(const std::string &addr);
87    const EthAddr &operator=(const eth_addr &ea);
88    const EthAddr &operator=(const std::string &addr);
89
90    int size() const { return sizeof(eth_addr); }
91
92    const uint8_t *bytes() const { return &data[0]; }
93    uint8_t *bytes() { return &data[0]; }
94
95    const uint8_t *addr() const { return &data[0]; }
96    bool unicast() const { return data[0] == 0x00; }
97    bool multicast() const { return data[0] == 0x01; }
98    bool broadcast() const { return data[0] == 0xff; }
99    std::string string() const;
100
101    operator uint64_t() const
102    {
103        uint64_t reg = 0;
104        reg |= ((uint64_t)data[0]) << 40;
105        reg |= ((uint64_t)data[1]) << 32;
106        reg |= ((uint64_t)data[2]) << 24;
107        reg |= ((uint64_t)data[3]) << 16;
108        reg |= ((uint64_t)data[4]) << 8;
109        reg |= ((uint64_t)data[5]) << 0;
110        return reg;
111    }
112
113};
114
115std::ostream &operator<<(std::ostream &stream, const EthAddr &ea);
116bool operator==(const EthAddr &left, const EthAddr &right);
117
118struct EthHdr : public eth_hdr
119{
120    bool isVlan() const { return (ntohs(eth_type) == ETH_TYPE_8021Q); }
121    uint16_t type() const {
122        if (!isVlan())
123            return ntohs(eth_type);
124        else
125            // L3 type is now 16 bytes into the hdr with 802.1Q
126            // instead of 12.  dnet/eth.h only supports 802.1
127            return ntohs(*((uint16_t*)(((uint8_t *)this) + 16)));
128    }
129    uint16_t vlanId() const {
130        if (isVlan())
131            return ntohs(*((uint16_t*)(((uint8_t *)this) + 14)));
132        else
133            return 0x0000;
134    }
135
136    const EthAddr &src() const { return *(EthAddr *)&eth_src; }
137    const EthAddr &dst() const { return *(EthAddr *)&eth_dst; }
138
139    int size() const {
140        if (!isVlan())
141            return sizeof(eth_hdr);
142        else
143            return (sizeof(eth_hdr)+4);
144    }
145
146    const uint8_t *bytes() const { return (const uint8_t *)this; }
147    const uint8_t *payload() const { return bytes() + size(); }
148    uint8_t *bytes() { return (uint8_t *)this; }
149    uint8_t *payload() { return bytes() + size(); }
150};
151
152class EthPtr
153{
154  protected:
155    friend class IpPtr;
156    friend class Ip6Ptr;
157    EthPacketPtr p;
158
159  public:
160    EthPtr() {}
161    EthPtr(const EthPacketPtr &ptr) : p(ptr) { }
162
163    EthHdr *operator->() { return (EthHdr *)p->data; }
164    EthHdr &operator*() { return *(EthHdr *)p->data; }
165    operator EthHdr *() { return (EthHdr *)p->data; }
166
167    const EthHdr *operator->() const { return (const EthHdr *)p->data; }
168    const EthHdr &operator*() const { return *(const EthHdr *)p->data; }
169    operator const EthHdr *() const { return (const EthHdr *)p->data; }
170
171    const EthPtr &operator=(const EthPacketPtr &ptr) { p = ptr; return *this; }
172
173    const EthPacketPtr packet() const { return p; }
174    EthPacketPtr packet() { return p; }
175    bool operator!() const { return !p; }
176    operator bool() const { return p; }
177    int off() const { return 0; }
178    int pstart() const { return off() + ((const EthHdr*)p->data)->size(); }
179};
180
181/*
182 * IP Stuff
183 */
184struct IpAddress
185{
186  protected:
187    uint32_t _ip;
188
189  public:
190    IpAddress() : _ip(0)
191    {}
192    IpAddress(const uint32_t __ip) : _ip(__ip)
193    {}
194
195    uint32_t ip() const { return _ip; }
196
197    std::string string() const;
198};
199
200std::ostream &operator<<(std::ostream &stream, const IpAddress &ia);
201bool operator==(const IpAddress &left, const IpAddress &right);
202
203struct IpNetmask : public IpAddress
204{
205  protected:
206    uint8_t _netmask;
207
208  public:
209    IpNetmask() : IpAddress(), _netmask(0)
210    {}
211    IpNetmask(const uint32_t __ip, const uint8_t __netmask) :
212        IpAddress(__ip), _netmask(__netmask)
213    {}
214
215    uint8_t netmask() const { return _netmask; }
216
217    std::string string() const;
218};
219
220std::ostream &operator<<(std::ostream &stream, const IpNetmask &in);
221bool operator==(const IpNetmask &left, const IpNetmask &right);
222
223struct IpWithPort : public IpAddress
224{
225  protected:
226    uint16_t _port;
227
228  public:
229    IpWithPort() : IpAddress(), _port(0)
230    {}
231    IpWithPort(const uint32_t __ip, const uint16_t __port) :
232        IpAddress(__ip), _port(__port)
233    {}
234
235    uint8_t port() const { return _port; }
236
237    std::string string() const;
238};
239
240std::ostream &operator<<(std::ostream &stream, const IpWithPort &iwp);
241bool operator==(const IpWithPort &left, const IpWithPort &right);
242
243struct IpOpt;
244struct IpHdr : public ip_hdr
245{
246    uint8_t  version() const { return ip_v; }
247    uint8_t  hlen() const { return ip_hl * 4; }
248    uint8_t  tos() const { return ip_tos; }
249    uint16_t len() const { return ntohs(ip_len); }
250    uint16_t id() const { return ntohs(ip_id); }
251    uint16_t frag_flags() const { return ntohs(ip_off) >> 13; }
252    uint16_t frag_off() const { return ntohs(ip_off) & 0x1fff; }
253    uint8_t  ttl() const { return ip_ttl; }
254    uint8_t  proto() const { return ip_p; }
255    uint16_t sum() const { return ip_sum; }
256    uint32_t src() const { return ntohl(ip_src); }
257    uint32_t dst() const { return ntohl(ip_dst); }
258
259    void sum(uint16_t sum) { ip_sum = sum; }
260    void id(uint16_t _id) { ip_id = htons(_id); }
261    void len(uint16_t _len) { ip_len = htons(_len); }
262
263    bool options(std::vector<const IpOpt *> &vec) const;
264
265    int size() const { return hlen(); }
266    const uint8_t *bytes() const { return (const uint8_t *)this; }
267    const uint8_t *payload() const { return bytes() + size(); }
268    uint8_t *bytes() { return (uint8_t *)this; }
269    uint8_t *payload() { return bytes() + size(); }
270};
271
272class IpPtr
273{
274  protected:
275    friend class TcpPtr;
276    friend class UdpPtr;
277    EthPacketPtr p;
278    bool eth_hdr_vlan;
279
280    void set(const EthPacketPtr &ptr)
281    {
282        p = 0;
283        eth_hdr_vlan = false;
284
285        if (ptr) {
286            EthHdr *eth = (EthHdr *)ptr->data;
287            if (eth->type() == ETH_TYPE_IP)
288                p = ptr;
289            if (eth->isVlan())
290                eth_hdr_vlan = true;
291        }
292    }
293
294  public:
295    IpPtr() : p(0), eth_hdr_vlan(false) {}
296    IpPtr(const EthPacketPtr &ptr) : p(0), eth_hdr_vlan(false) { set(ptr); }
297    IpPtr(const EthPtr &ptr) : p(0), eth_hdr_vlan(false) { set(ptr.p); }
298    IpPtr(const IpPtr &ptr) : p(ptr.p), eth_hdr_vlan(ptr.eth_hdr_vlan) { }
299
300    IpHdr *get() { return (IpHdr *)(p->data + sizeof(eth_hdr) +
301                                   ((eth_hdr_vlan) ? 4 : 0)); }
302    IpHdr *operator->() { return get(); }
303    IpHdr &operator*() { return *get(); }
304
305    const IpHdr *get() const
306    { return (const IpHdr *)(p->data + sizeof(eth_hdr) +
307                            ((eth_hdr_vlan) ? 4 : 0)); }
308    const IpHdr *operator->() const { return get(); }
309    const IpHdr &operator*() const { return *get(); }
310
311    const IpPtr &operator=(const EthPacketPtr &ptr) { set(ptr); return *this; }
312    const IpPtr &operator=(const EthPtr &ptr) { set(ptr.p); return *this; }
313    const IpPtr &operator=(const IpPtr &ptr) { p = ptr.p; return *this; }
314
315    const EthPacketPtr packet() const { return p; }
316    EthPacketPtr packet() { return p; }
317    bool operator!() const { return !p; }
318    operator bool() const { return p; }
319    int off() const { return (sizeof(eth_hdr) + ((eth_hdr_vlan) ? 4 : 0)); }
320    int pstart() const { return (off() + get()->size()); }
321};
322
323uint16_t cksum(const IpPtr &ptr);
324
325struct IpOpt : public ip_opt
326{
327    uint8_t type() const { return opt_type; }
328    uint8_t typeNumber() const { return IP_OPT_NUMBER(opt_type); }
329    uint8_t typeClass() const { return IP_OPT_CLASS(opt_type); }
330    uint8_t typeCopied() const { return IP_OPT_COPIED(opt_type); }
331    uint8_t len() const { return IP_OPT_TYPEONLY(type()) ? 1 : opt_len; }
332
333    bool isNumber(int num) const { return typeNumber() == IP_OPT_NUMBER(num); }
334    bool isClass(int cls) const { return typeClass() == IP_OPT_CLASS(cls); }
335    bool isCopied(int cpy) const { return typeCopied() == IP_OPT_COPIED(cpy); }
336
337    const uint8_t *data() const { return opt_data.data8; }
338    void sec(ip_opt_data_sec &sec) const;
339    void lsrr(ip_opt_data_rr &rr) const;
340    void ssrr(ip_opt_data_rr &rr) const;
341    void ts(ip_opt_data_ts &ts) const;
342    uint16_t satid() const { return ntohs(opt_data.satid); }
343    uint16_t mtup() const { return ntohs(opt_data.mtu); }
344    uint16_t mtur() const { return ntohs(opt_data.mtu); }
345    void tr(ip_opt_data_tr &tr) const;
346    const uint32_t *addext() const { return &opt_data.addext[0]; }
347    uint16_t rtralt() const { return ntohs(opt_data.rtralt); }
348    void sdb(std::vector<uint32_t> &vec) const;
349};
350
351/*
352 * Ip6 Classes
353 */
354struct Ip6Opt;
355struct Ip6Hdr : public ip6_hdr
356{
357    uint8_t version() const { return ip6_vfc; }
358    uint32_t flow() const { return ntohl(ip6_flow); }
359    uint16_t plen() const { return ntohs(ip6_plen); }
360    uint16_t hlen() const { return IP6_HDR_LEN; }
361    uint8_t nxt() const { return ip6_nxt; }
362    uint8_t hlim() const { return ip6_hlim; }
363
364    const uint8_t* src() const { return ip6_src.data; }
365    const uint8_t* dst() const { return ip6_dst.data; }
366
367    int extensionLength() const;
368    const Ip6Opt* getExt(uint8_t ext) const;
369    const Ip6Opt* fragmentExt() const { return getExt(IP_PROTO_FRAGMENT); }
370    const Ip6Opt* rtTypeExt() const { return getExt(IP_PROTO_ROUTING); }
371    const Ip6Opt* dstOptExt() const { return getExt(IP_PROTO_DSTOPTS); }
372    uint8_t proto() const;
373
374    void plen(uint16_t _plen) { ip6_plen = htons(_plen); }
375
376    int size() const { return IP6_HDR_LEN + extensionLength(); }
377    const uint8_t *bytes() const { return (const uint8_t *)this; }
378    const uint8_t *payload() const { return bytes() + IP6_HDR_LEN
379                                            + extensionLength(); }
380    uint8_t *bytes() { return (uint8_t *)this; }
381    uint8_t *payload() { return bytes() + IP6_HDR_LEN
382                                + extensionLength(); }
383};
384
385class Ip6Ptr
386{
387  protected:
388    friend class TcpPtr;
389    friend class UdpPtr;
390    EthPacketPtr p;
391    bool eth_hdr_vlan;
392
393    void set(const EthPacketPtr &ptr)
394    {
395        p = 0;
396        eth_hdr_vlan = false;
397
398        if (ptr) {
399            EthHdr *eth = (EthHdr *)ptr->data;
400            if (eth->type() == ETH_TYPE_IPV6)
401                p = ptr;
402            if (eth->isVlan())
403                eth_hdr_vlan = true;
404        }
405    }
406
407  public:
408    Ip6Ptr() : p(0), eth_hdr_vlan(false) {}
409    Ip6Ptr(const EthPacketPtr &ptr) : p(0), eth_hdr_vlan(false) { set(ptr); }
410    Ip6Ptr(const EthPtr &ptr) : p(0), eth_hdr_vlan(false) { set(ptr.p); }
411    Ip6Ptr(const Ip6Ptr &ptr) : p(ptr.p), eth_hdr_vlan(ptr.eth_hdr_vlan) { }
412
413    Ip6Hdr *get() { return (Ip6Hdr *)(p->data + sizeof(eth_hdr)
414                                      + ((eth_hdr_vlan) ? 4 : 0)); }
415    Ip6Hdr *operator->() { return get(); }
416    Ip6Hdr &operator*() { return *get(); }
417
418    const Ip6Hdr *get() const
419    { return (const Ip6Hdr *)(p->data + sizeof(eth_hdr)
420                              + ((eth_hdr_vlan) ? 4 : 0)); }
421    const Ip6Hdr *operator->() const { return get(); }
422    const Ip6Hdr &operator*() const { return *get(); }
423
424    const Ip6Ptr &operator=(const EthPacketPtr &ptr)
425    { set(ptr); return *this; }
426    const Ip6Ptr &operator=(const EthPtr &ptr)
427    { set(ptr.p); return *this; }
428    const Ip6Ptr &operator=(const Ip6Ptr &ptr)
429    { p = ptr.p; return *this; }
430
431    const EthPacketPtr packet() const { return p; }
432    EthPacketPtr packet() { return p; }
433    bool operator!() const { return !p; }
434    operator bool() const { return p; }
435    int off() const { return sizeof(eth_hdr) + ((eth_hdr_vlan) ? 4 : 0); }
436    int pstart() const { return off() + get()->size(); }
437};
438
439// Dnet supplied ipv6 opt header is incomplete and
440// newer NIC card filters expect a more robust
441// ipv6 header option declaration.
442struct ip6_opt_fragment {
443    uint16_t offlg;
444    uint32_t ident;
445};
446
447struct ip6_opt_routing_type2 {
448    uint8_t type;
449    uint8_t segleft;
450    uint32_t reserved;
451    ip6_addr_t addr;
452};
453
454#define HOME_ADDRESS_OPTION 0xC9
455struct ip6_opt_dstopts {
456    uint8_t type;
457    uint8_t length;
458    ip6_addr_t addr;
459} __attribute__((packed));
460
461struct ip6_opt_hdr
462{
463    uint8_t ext_nxt;
464    uint8_t ext_len;
465    union {
466        struct ip6_opt_fragment fragment;
467        struct ip6_opt_routing_type2 rtType2;
468        struct ip6_opt_dstopts dstOpts;
469    } ext_data;
470} __attribute__((packed));
471
472struct Ip6Opt : public ip6_opt_hdr
473{
474    uint8_t nxt() const { return ext_nxt; }
475    uint8_t extlen() const { return ext_len; }
476    uint8_t len() const { return extlen() + 8; }
477
478    // Supporting the types of header extensions likely to be encountered:
479    // fragment, routing type 2 and dstopts.
480
481    // Routing type 2
482    uint8_t  rtType2Type() const { return ext_data.rtType2.type; }
483    uint8_t  rtType2SegLft() const { return ext_data.rtType2.segleft; }
484    const uint8_t* rtType2Addr() const { return ext_data.rtType2.addr.data; }
485
486    // Fragment
487    uint16_t fragmentOfflg() const { return ntohs(ext_data.fragment.offlg); }
488    uint32_t fragmentIdent() const { return ntohl(ext_data.fragment.ident); }
489
490    // Dst Options/Home Address Option
491    uint8_t dstOptType() const { return ext_data.dstOpts.type; }
492    uint8_t dstOptLength() const { return ext_data.dstOpts.length; }
493    const uint8_t* dstOptAddr() const { return ext_data.dstOpts.addr.data; }
494};
495
496
497/*
498 * TCP Stuff
499 */
500struct TcpOpt;
501struct TcpHdr : public tcp_hdr
502{
503    uint16_t sport() const { return ntohs(th_sport); }
504    uint16_t dport() const { return ntohs(th_dport); }
505    uint32_t seq() const { return ntohl(th_seq); }
506    uint32_t ack() const { return ntohl(th_ack); }
507    uint8_t  off() const { return th_off*4; }
508    uint8_t  flags() const { return th_flags & 0x3f; }
509    uint16_t win() const { return ntohs(th_win); }
510    uint16_t sum() const { return th_sum; }
511    uint16_t urp() const { return ntohs(th_urp); }
512
513    void sum(uint16_t sum) { th_sum = sum; }
514    void seq(uint32_t _seq) { th_seq = htonl(_seq); }
515    void flags(uint8_t _flags) { th_flags  = _flags; }
516
517    bool options(std::vector<const TcpOpt *> &vec) const;
518
519    int size() const { return off(); }
520    const uint8_t *bytes() const { return (const uint8_t *)this; }
521    const uint8_t *payload() const { return bytes() + size(); }
522    uint8_t *bytes() { return (uint8_t *)this; }
523    uint8_t *payload() { return bytes() + size(); }
524};
525
526class TcpPtr
527{
528  protected:
529    EthPacketPtr p;
530    int _off;
531
532    void set(const EthPacketPtr &ptr, int offset) { p = ptr; _off = offset; }
533    void set(const IpPtr &ptr)
534    {
535        if (ptr && ptr->proto() == IP_PROTO_TCP)
536            set(ptr.p, ptr.pstart());
537        else
538            set(0, 0);
539    }
540    void set(const Ip6Ptr &ptr)
541    {
542        if (ptr && ptr->proto() == IP_PROTO_TCP)
543            set(ptr.p, ptr.pstart());
544        else
545            set(0, 0);
546    }
547
548  public:
549    TcpPtr() : p(0), _off(0) {}
550    TcpPtr(const IpPtr &ptr) : p(0), _off(0) { set(ptr); }
551    TcpPtr(const Ip6Ptr &ptr) : p(0), _off(0) { set(ptr); }
552    TcpPtr(const TcpPtr &ptr) : p(ptr.p), _off(ptr._off) {}
553
554    TcpHdr *get() { return (TcpHdr *)(p->data + _off); }
555    TcpHdr *operator->() { return get(); }
556    TcpHdr &operator*() { return *get(); }
557
558    const TcpHdr *get() const { return (const TcpHdr *)(p->data + _off); }
559    const TcpHdr *operator->() const { return get(); }
560    const TcpHdr &operator*() const { return *get(); }
561
562    const TcpPtr &operator=(const IpPtr &i)
563    { set(i); return *this; }
564    const TcpPtr &operator=(const TcpPtr &t)
565    { set(t.p, t._off); return *this; }
566
567    const EthPacketPtr packet() const { return p; }
568    EthPacketPtr packet() { return p; }
569    bool operator!() const { return !p; }
570    operator bool() const { return p; }
571    int off() const { return _off; }
572    int pstart() const { return off() + get()->size(); }
573};
574
575uint16_t cksum(const TcpPtr &ptr);
576
577struct TcpOpt : public tcp_opt
578{
579    uint8_t type() const { return opt_type; }
580    uint8_t len() const { return TCP_OPT_TYPEONLY(type()) ? 1 : opt_len; }
581
582    bool isopt(int opt) const { return type() == opt; }
583
584    const uint8_t *data() const { return opt_data.data8; }
585
586    uint16_t mss() const { return ntohs(opt_data.mss); }
587    uint8_t wscale() const { return opt_data.wscale; }
588    uint32_t echo() const { return ntohl(opt_data.echo); }
589    uint32_t tsval() const { return ntohl(opt_data.timestamp[0]); }
590    uint32_t tsecr() const { return ntohl(opt_data.timestamp[1]); }
591    uint32_t cc() const { return ntohl(opt_data.cc); }
592    uint8_t cksum() const{ return opt_data.cksum; }
593    const uint8_t *md5() const { return opt_data.md5; }
594
595    int size() const { return len(); }
596    const uint8_t *bytes() const { return (const uint8_t *)this; }
597    const uint8_t *payload() const { return bytes() + size(); }
598    uint8_t *bytes() { return (uint8_t *)this; }
599    uint8_t *payload() { return bytes() + size(); }
600};
601
602/*
603 * UDP Stuff
604 */
605struct UdpHdr : public udp_hdr
606{
607    uint16_t sport() const { return ntohs(uh_sport); }
608    uint16_t dport() const { return ntohs(uh_dport); }
609    uint16_t len() const { return ntohs(uh_ulen); }
610    uint16_t sum() const { return uh_sum; }
611
612    void sum(uint16_t sum) { uh_sum = sum; }
613    void len(uint16_t _len) { uh_ulen = htons(_len); }
614
615    int size() const { return sizeof(udp_hdr); }
616    const uint8_t *bytes() const { return (const uint8_t *)this; }
617    const uint8_t *payload() const { return bytes() + size(); }
618    uint8_t *bytes() { return (uint8_t *)this; }
619    uint8_t *payload() { return bytes() + size(); }
620};
621
622class UdpPtr
623{
624  protected:
625    EthPacketPtr p;
626    int _off;
627
628    void set(const EthPacketPtr &ptr, int offset) { p = ptr; _off = offset; }
629    void set(const IpPtr &ptr)
630    {
631        if (ptr && ptr->proto() == IP_PROTO_UDP)
632            set(ptr.p, ptr.pstart());
633        else
634            set(0, 0);
635    }
636    void set(const Ip6Ptr &ptr)
637    {
638        if (ptr && ptr->proto() == IP_PROTO_UDP)
639            set(ptr.p, ptr.pstart());
640        else
641            set(0, 0);
642    }
643
644  public:
645    UdpPtr() : p(0), _off(0) {}
646    UdpPtr(const IpPtr &ptr) : p(0), _off(0) { set(ptr); }
647    UdpPtr(const Ip6Ptr &ptr) : p(0), _off(0) { set(ptr); }
648    UdpPtr(const UdpPtr &ptr) : p(ptr.p), _off(ptr._off) {}
649
650    UdpHdr *get() { return (UdpHdr *)(p->data + _off); }
651    UdpHdr *operator->() { return get(); }
652    UdpHdr &operator*() { return *get(); }
653
654    const UdpHdr *get() const { return (const UdpHdr *)(p->data + _off); }
655    const UdpHdr *operator->() const { return get(); }
656    const UdpHdr &operator*() const { return *get(); }
657
658    const UdpPtr &operator=(const IpPtr &i) { set(i); return *this; }
659    const UdpPtr &operator=(const UdpPtr &t)
660    { set(t.p, t._off); return *this; }
661
662    const EthPacketPtr packet() const { return p; }
663    EthPacketPtr packet() { return p; }
664    bool operator!() const { return !p; }
665    operator bool() const { return p; }
666    int off() const { return _off; }
667    int pstart() const { return off() + get()->size(); }
668};
669
670uint16_t __tu_cksum6(const Ip6Ptr &ip6);
671uint16_t __tu_cksum(const IpPtr &ip);
672uint16_t cksum(const UdpPtr &ptr);
673
674int hsplit(const EthPacketPtr &ptr);
675
676} // namespace Net
677
678#endif // __BASE_INET_HH__
679