inet.hh revision 10251 
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] & 0x01); }
97    bool multicast() const { return !unicast() && !broadcast(); }
98    bool broadcast() const
99    {
100        bool isBroadcast = true;
101        for (int i = 0; i < ETH_ADDR_LEN; ++i) {
102            isBroadcast = isBroadcast && data[i] == 0xff;
103        }
104
105        return isBroadcast;
106    }
107
108    std::string string() const;
109
110    operator uint64_t() const
111    {
112        uint64_t reg = 0;
113        reg |= ((uint64_t)data[0]) << 40;
114        reg |= ((uint64_t)data[1]) << 32;
115        reg |= ((uint64_t)data[2]) << 24;
116        reg |= ((uint64_t)data[3]) << 16;
117        reg |= ((uint64_t)data[4]) << 8;
118        reg |= ((uint64_t)data[5]) << 0;
119        return reg;
120    }
121
122};
123
124std::ostream &operator<<(std::ostream &stream, const EthAddr &ea);
125bool operator==(const EthAddr &left, const EthAddr &right);
126
127struct EthHdr : public eth_hdr
128{
129    bool isVlan() const { return (ntohs(eth_type) == ETH_TYPE_8021Q); }
130    uint16_t type() const {
131        if (!isVlan())
132            return ntohs(eth_type);
133        else
134            // L3 type is now 16 bytes into the hdr with 802.1Q
135            // instead of 12.  dnet/eth.h only supports 802.1
136            return ntohs(*((uint16_t*)(((uint8_t *)this) + 16)));
137    }
138    uint16_t vlanId() const {
139        if (isVlan())
140            return ntohs(*((uint16_t*)(((uint8_t *)this) + 14)));
141        else
142            return 0x0000;
143    }
144
145    const EthAddr &src() const { return *(EthAddr *)&eth_src; }
146    const EthAddr &dst() const { return *(EthAddr *)&eth_dst; }
147
148    int size() const {
149        if (!isVlan())
150            return sizeof(eth_hdr);
151        else
152            return (sizeof(eth_hdr)+4);
153    }
154
155    const uint8_t *bytes() const { return (const uint8_t *)this; }
156    const uint8_t *payload() const { return bytes() + size(); }
157    uint8_t *bytes() { return (uint8_t *)this; }
158    uint8_t *payload() { return bytes() + size(); }
159};
160
161class EthPtr
162{
163  protected:
164    friend class IpPtr;
165    friend class Ip6Ptr;
166    EthPacketPtr p;
167
168  public:
169    EthPtr() {}
170    EthPtr(const EthPacketPtr &ptr) : p(ptr) { }
171
172    EthHdr *operator->() { return (EthHdr *)p->data; }
173    EthHdr &operator*() { return *(EthHdr *)p->data; }
174    operator EthHdr *() { return (EthHdr *)p->data; }
175
176    const EthHdr *operator->() const { return (const EthHdr *)p->data; }
177    const EthHdr &operator*() const { return *(const EthHdr *)p->data; }
178    operator const EthHdr *() const { return (const EthHdr *)p->data; }
179
180    const EthPtr &operator=(const EthPacketPtr &ptr) { p = ptr; return *this; }
181
182    const EthPacketPtr packet() const { return p; }
183    EthPacketPtr packet() { return p; }
184    bool operator!() const { return !p; }
185    operator bool() const { return p; }
186    int off() const { return 0; }
187    int pstart() const { return off() + ((const EthHdr*)p->data)->size(); }
188};
189
190/*
191 * IP Stuff
192 */
193struct IpAddress
194{
195  protected:
196    uint32_t _ip;
197
198  public:
199    IpAddress() : _ip(0)
200    {}
201    IpAddress(const uint32_t __ip) : _ip(__ip)
202    {}
203
204    uint32_t ip() const { return _ip; }
205
206    std::string string() const;
207};
208
209std::ostream &operator<<(std::ostream &stream, const IpAddress &ia);
210bool operator==(const IpAddress &left, const IpAddress &right);
211
212struct IpNetmask : public IpAddress
213{
214  protected:
215    uint8_t _netmask;
216
217  public:
218    IpNetmask() : IpAddress(), _netmask(0)
219    {}
220    IpNetmask(const uint32_t __ip, const uint8_t __netmask) :
221        IpAddress(__ip), _netmask(__netmask)
222    {}
223
224    uint8_t netmask() const { return _netmask; }
225
226    std::string string() const;
227};
228
229std::ostream &operator<<(std::ostream &stream, const IpNetmask &in);
230bool operator==(const IpNetmask &left, const IpNetmask &right);
231
232struct IpWithPort : public IpAddress
233{
234  protected:
235    uint16_t _port;
236
237  public:
238    IpWithPort() : IpAddress(), _port(0)
239    {}
240    IpWithPort(const uint32_t __ip, const uint16_t __port) :
241        IpAddress(__ip), _port(__port)
242    {}
243
244    uint8_t port() const { return _port; }
245
246    std::string string() const;
247};
248
249std::ostream &operator<<(std::ostream &stream, const IpWithPort &iwp);
250bool operator==(const IpWithPort &left, const IpWithPort &right);
251
252struct IpOpt;
253struct IpHdr : public ip_hdr
254{
255    uint8_t  version() const { return ip_v; }
256    uint8_t  hlen() const { return ip_hl * 4; }
257    uint8_t  tos() const { return ip_tos; }
258    uint16_t len() const { return ntohs(ip_len); }
259    uint16_t id() const { return ntohs(ip_id); }
260    uint16_t frag_flags() const { return ntohs(ip_off) >> 13; }
261    uint16_t frag_off() const { return ntohs(ip_off) & 0x1fff; }
262    uint8_t  ttl() const { return ip_ttl; }
263    uint8_t  proto() const { return ip_p; }
264    uint16_t sum() const { return ip_sum; }
265    uint32_t src() const { return ntohl(ip_src); }
266    uint32_t dst() const { return ntohl(ip_dst); }
267
268    void sum(uint16_t sum) { ip_sum = sum; }
269    void id(uint16_t _id) { ip_id = htons(_id); }
270    void len(uint16_t _len) { ip_len = htons(_len); }
271
272    bool options(std::vector<const IpOpt *> &vec) const;
273
274    int size() const { return hlen(); }
275    const uint8_t *bytes() const { return (const uint8_t *)this; }
276    const uint8_t *payload() const { return bytes() + size(); }
277    uint8_t *bytes() { return (uint8_t *)this; }
278    uint8_t *payload() { return bytes() + size(); }
279};
280
281class IpPtr
282{
283  protected:
284    friend class TcpPtr;
285    friend class UdpPtr;
286    EthPacketPtr p;
287    bool eth_hdr_vlan;
288
289    void set(const EthPacketPtr &ptr)
290    {
291        p = 0;
292        eth_hdr_vlan = false;
293
294        if (ptr) {
295            EthHdr *eth = (EthHdr *)ptr->data;
296            if (eth->type() == ETH_TYPE_IP)
297                p = ptr;
298            if (eth->isVlan())
299                eth_hdr_vlan = true;
300        }
301    }
302
303  public:
304    IpPtr() : p(0), eth_hdr_vlan(false) {}
305    IpPtr(const EthPacketPtr &ptr) : p(0), eth_hdr_vlan(false) { set(ptr); }
306    IpPtr(const EthPtr &ptr) : p(0), eth_hdr_vlan(false) { set(ptr.p); }
307    IpPtr(const IpPtr &ptr) : p(ptr.p), eth_hdr_vlan(ptr.eth_hdr_vlan) { }
308
309    IpHdr *get() { return (IpHdr *)(p->data + sizeof(eth_hdr) +
310                                   ((eth_hdr_vlan) ? 4 : 0)); }
311    IpHdr *operator->() { return get(); }
312    IpHdr &operator*() { return *get(); }
313
314    const IpHdr *get() const
315    { return (const IpHdr *)(p->data + sizeof(eth_hdr) +
316                            ((eth_hdr_vlan) ? 4 : 0)); }
317    const IpHdr *operator->() const { return get(); }
318    const IpHdr &operator*() const { return *get(); }
319
320    const IpPtr &operator=(const EthPacketPtr &ptr) { set(ptr); return *this; }
321    const IpPtr &operator=(const EthPtr &ptr) { set(ptr.p); return *this; }
322    const IpPtr &operator=(const IpPtr &ptr) { p = ptr.p; return *this; }
323
324    const EthPacketPtr packet() const { return p; }
325    EthPacketPtr packet() { return p; }
326    bool operator!() const { return !p; }
327    operator bool() const { return p; }
328    int off() const { return (sizeof(eth_hdr) + ((eth_hdr_vlan) ? 4 : 0)); }
329    int pstart() const { return (off() + get()->size()); }
330};
331
332uint16_t cksum(const IpPtr &ptr);
333
334struct IpOpt : public ip_opt
335{
336    uint8_t type() const { return opt_type; }
337    uint8_t typeNumber() const { return IP_OPT_NUMBER(opt_type); }
338    uint8_t typeClass() const { return IP_OPT_CLASS(opt_type); }
339    uint8_t typeCopied() const { return IP_OPT_COPIED(opt_type); }
340    uint8_t len() const { return IP_OPT_TYPEONLY(type()) ? 1 : opt_len; }
341
342    bool isNumber(int num) const { return typeNumber() == IP_OPT_NUMBER(num); }
343    bool isClass(int cls) const { return typeClass() == IP_OPT_CLASS(cls); }
344    bool isCopied(int cpy) const { return typeCopied() == IP_OPT_COPIED(cpy); }
345
346    const uint8_t *data() const { return opt_data.data8; }
347    void sec(ip_opt_data_sec &sec) const;
348    void lsrr(ip_opt_data_rr &rr) const;
349    void ssrr(ip_opt_data_rr &rr) const;
350    void ts(ip_opt_data_ts &ts) const;
351    uint16_t satid() const { return ntohs(opt_data.satid); }
352    uint16_t mtup() const { return ntohs(opt_data.mtu); }
353    uint16_t mtur() const { return ntohs(opt_data.mtu); }
354    void tr(ip_opt_data_tr &tr) const;
355    const uint32_t *addext() const { return &opt_data.addext[0]; }
356    uint16_t rtralt() const { return ntohs(opt_data.rtralt); }
357    void sdb(std::vector<uint32_t> &vec) const;
358};
359
360/*
361 * Ip6 Classes
362 */
363struct Ip6Opt;
364struct Ip6Hdr : public ip6_hdr
365{
366    uint8_t version() const { return ip6_vfc; }
367    uint32_t flow() const { return ntohl(ip6_flow); }
368    uint16_t plen() const { return ntohs(ip6_plen); }
369    uint16_t hlen() const { return IP6_HDR_LEN; }
370    uint8_t nxt() const { return ip6_nxt; }
371    uint8_t hlim() const { return ip6_hlim; }
372
373    const uint8_t* src() const { return ip6_src.data; }
374    const uint8_t* dst() const { return ip6_dst.data; }
375
376    int extensionLength() const;
377    const Ip6Opt* getExt(uint8_t ext) const;
378    const Ip6Opt* fragmentExt() const { return getExt(IP_PROTO_FRAGMENT); }
379    const Ip6Opt* rtTypeExt() const { return getExt(IP_PROTO_ROUTING); }
380    const Ip6Opt* dstOptExt() const { return getExt(IP_PROTO_DSTOPTS); }
381    uint8_t proto() const;
382
383    void plen(uint16_t _plen) { ip6_plen = htons(_plen); }
384
385    int size() const { return IP6_HDR_LEN + extensionLength(); }
386    const uint8_t *bytes() const { return (const uint8_t *)this; }
387    const uint8_t *payload() const { return bytes() + IP6_HDR_LEN
388                                            + extensionLength(); }
389    uint8_t *bytes() { return (uint8_t *)this; }
390    uint8_t *payload() { return bytes() + IP6_HDR_LEN
391                                + extensionLength(); }
392};
393
394class Ip6Ptr
395{
396  protected:
397    friend class TcpPtr;
398    friend class UdpPtr;
399    EthPacketPtr p;
400    bool eth_hdr_vlan;
401
402    void set(const EthPacketPtr &ptr)
403    {
404        p = 0;
405        eth_hdr_vlan = false;
406
407        if (ptr) {
408            EthHdr *eth = (EthHdr *)ptr->data;
409            if (eth->type() == ETH_TYPE_IPV6)
410                p = ptr;
411            if (eth->isVlan())
412                eth_hdr_vlan = true;
413        }
414    }
415
416  public:
417    Ip6Ptr() : p(0), eth_hdr_vlan(false) {}
418    Ip6Ptr(const EthPacketPtr &ptr) : p(0), eth_hdr_vlan(false) { set(ptr); }
419    Ip6Ptr(const EthPtr &ptr) : p(0), eth_hdr_vlan(false) { set(ptr.p); }
420    Ip6Ptr(const Ip6Ptr &ptr) : p(ptr.p), eth_hdr_vlan(ptr.eth_hdr_vlan) { }
421
422    Ip6Hdr *get() { return (Ip6Hdr *)(p->data + sizeof(eth_hdr)
423                                      + ((eth_hdr_vlan) ? 4 : 0)); }
424    Ip6Hdr *operator->() { return get(); }
425    Ip6Hdr &operator*() { return *get(); }
426
427    const Ip6Hdr *get() const
428    { return (const Ip6Hdr *)(p->data + sizeof(eth_hdr)
429                              + ((eth_hdr_vlan) ? 4 : 0)); }
430    const Ip6Hdr *operator->() const { return get(); }
431    const Ip6Hdr &operator*() const { return *get(); }
432
433    const Ip6Ptr &operator=(const EthPacketPtr &ptr)
434    { set(ptr); return *this; }
435    const Ip6Ptr &operator=(const EthPtr &ptr)
436    { set(ptr.p); return *this; }
437    const Ip6Ptr &operator=(const Ip6Ptr &ptr)
438    { p = ptr.p; return *this; }
439
440    const EthPacketPtr packet() const { return p; }
441    EthPacketPtr packet() { return p; }
442    bool operator!() const { return !p; }
443    operator bool() const { return p; }
444    int off() const { return sizeof(eth_hdr) + ((eth_hdr_vlan) ? 4 : 0); }
445    int pstart() const { return off() + get()->size(); }
446};
447
448// Dnet supplied ipv6 opt header is incomplete and
449// newer NIC card filters expect a more robust
450// ipv6 header option declaration.
451struct ip6_opt_fragment {
452    uint16_t offlg;
453    uint32_t ident;
454};
455
456struct ip6_opt_routing_type2 {
457    uint8_t type;
458    uint8_t segleft;
459    uint32_t reserved;
460    ip6_addr_t addr;
461};
462
463#define HOME_ADDRESS_OPTION 0xC9
464struct ip6_opt_dstopts {
465    uint8_t type;
466    uint8_t length;
467    ip6_addr_t addr;
468} __attribute__((packed));
469
470struct ip6_opt_hdr
471{
472    uint8_t ext_nxt;
473    uint8_t ext_len;
474    union {
475        struct ip6_opt_fragment fragment;
476        struct ip6_opt_routing_type2 rtType2;
477        struct ip6_opt_dstopts dstOpts;
478    } ext_data;
479} __attribute__((packed));
480
481struct Ip6Opt : public ip6_opt_hdr
482{
483    uint8_t nxt() const { return ext_nxt; }
484    uint8_t extlen() const { return ext_len; }
485    uint8_t len() const { return extlen() + 8; }
486
487    // Supporting the types of header extensions likely to be encountered:
488    // fragment, routing type 2 and dstopts.
489
490    // Routing type 2
491    uint8_t  rtType2Type() const { return ext_data.rtType2.type; }
492    uint8_t  rtType2SegLft() const { return ext_data.rtType2.segleft; }
493    const uint8_t* rtType2Addr() const { return ext_data.rtType2.addr.data; }
494
495    // Fragment
496    uint16_t fragmentOfflg() const { return ntohs(ext_data.fragment.offlg); }
497    uint32_t fragmentIdent() const { return ntohl(ext_data.fragment.ident); }
498
499    // Dst Options/Home Address Option
500    uint8_t dstOptType() const { return ext_data.dstOpts.type; }
501    uint8_t dstOptLength() const { return ext_data.dstOpts.length; }
502    const uint8_t* dstOptAddr() const { return ext_data.dstOpts.addr.data; }
503};
504
505
506/*
507 * TCP Stuff
508 */
509struct TcpOpt;
510struct TcpHdr : public tcp_hdr
511{
512    uint16_t sport() const { return ntohs(th_sport); }
513    uint16_t dport() const { return ntohs(th_dport); }
514    uint32_t seq() const { return ntohl(th_seq); }
515    uint32_t ack() const { return ntohl(th_ack); }
516    uint8_t  off() const { return th_off*4; }
517    uint8_t  flags() const { return th_flags & 0x3f; }
518    uint16_t win() const { return ntohs(th_win); }
519    uint16_t sum() const { return th_sum; }
520    uint16_t urp() const { return ntohs(th_urp); }
521
522    void sum(uint16_t sum) { th_sum = sum; }
523    void seq(uint32_t _seq) { th_seq = htonl(_seq); }
524    void flags(uint8_t _flags) { th_flags  = _flags; }
525
526    bool options(std::vector<const TcpOpt *> &vec) const;
527
528    int size() const { return off(); }
529    const uint8_t *bytes() const { return (const uint8_t *)this; }
530    const uint8_t *payload() const { return bytes() + size(); }
531    uint8_t *bytes() { return (uint8_t *)this; }
532    uint8_t *payload() { return bytes() + size(); }
533};
534
535class TcpPtr
536{
537  protected:
538    EthPacketPtr p;
539    int _off;
540
541    void set(const EthPacketPtr &ptr, int offset) { p = ptr; _off = offset; }
542    void set(const IpPtr &ptr)
543    {
544        if (ptr && ptr->proto() == IP_PROTO_TCP)
545            set(ptr.p, ptr.pstart());
546        else
547            set(0, 0);
548    }
549    void set(const Ip6Ptr &ptr)
550    {
551        if (ptr && ptr->proto() == IP_PROTO_TCP)
552            set(ptr.p, ptr.pstart());
553        else
554            set(0, 0);
555    }
556
557  public:
558    TcpPtr() : p(0), _off(0) {}
559    TcpPtr(const IpPtr &ptr) : p(0), _off(0) { set(ptr); }
560    TcpPtr(const Ip6Ptr &ptr) : p(0), _off(0) { set(ptr); }
561    TcpPtr(const TcpPtr &ptr) : p(ptr.p), _off(ptr._off) {}
562
563    TcpHdr *get() { return (TcpHdr *)(p->data + _off); }
564    TcpHdr *operator->() { return get(); }
565    TcpHdr &operator*() { return *get(); }
566
567    const TcpHdr *get() const { return (const TcpHdr *)(p->data + _off); }
568    const TcpHdr *operator->() const { return get(); }
569    const TcpHdr &operator*() const { return *get(); }
570
571    const TcpPtr &operator=(const IpPtr &i)
572    { set(i); return *this; }
573    const TcpPtr &operator=(const TcpPtr &t)
574    { set(t.p, t._off); return *this; }
575
576    const EthPacketPtr packet() const { return p; }
577    EthPacketPtr packet() { return p; }
578    bool operator!() const { return !p; }
579    operator bool() const { return p; }
580    int off() const { return _off; }
581    int pstart() const { return off() + get()->size(); }
582};
583
584uint16_t cksum(const TcpPtr &ptr);
585
586struct TcpOpt : public tcp_opt
587{
588    uint8_t type() const { return opt_type; }
589    uint8_t len() const { return TCP_OPT_TYPEONLY(type()) ? 1 : opt_len; }
590
591    bool isopt(int opt) const { return type() == opt; }
592
593    const uint8_t *data() const { return opt_data.data8; }
594
595    uint16_t mss() const { return ntohs(opt_data.mss); }
596    uint8_t wscale() const { return opt_data.wscale; }
597    uint32_t echo() const { return ntohl(opt_data.echo); }
598    uint32_t tsval() const { return ntohl(opt_data.timestamp[0]); }
599    uint32_t tsecr() const { return ntohl(opt_data.timestamp[1]); }
600    uint32_t cc() const { return ntohl(opt_data.cc); }
601    uint8_t cksum() const{ return opt_data.cksum; }
602    const uint8_t *md5() const { return opt_data.md5; }
603
604    int size() const { return len(); }
605    const uint8_t *bytes() const { return (const uint8_t *)this; }
606    const uint8_t *payload() const { return bytes() + size(); }
607    uint8_t *bytes() { return (uint8_t *)this; }
608    uint8_t *payload() { return bytes() + size(); }
609};
610
611/*
612 * UDP Stuff
613 */
614struct UdpHdr : public udp_hdr
615{
616    uint16_t sport() const { return ntohs(uh_sport); }
617    uint16_t dport() const { return ntohs(uh_dport); }
618    uint16_t len() const { return ntohs(uh_ulen); }
619    uint16_t sum() const { return uh_sum; }
620
621    void sum(uint16_t sum) { uh_sum = sum; }
622    void len(uint16_t _len) { uh_ulen = htons(_len); }
623
624    int size() const { return sizeof(udp_hdr); }
625    const uint8_t *bytes() const { return (const uint8_t *)this; }
626    const uint8_t *payload() const { return bytes() + size(); }
627    uint8_t *bytes() { return (uint8_t *)this; }
628    uint8_t *payload() { return bytes() + size(); }
629};
630
631class UdpPtr
632{
633  protected:
634    EthPacketPtr p;
635    int _off;
636
637    void set(const EthPacketPtr &ptr, int offset) { p = ptr; _off = offset; }
638    void set(const IpPtr &ptr)
639    {
640        if (ptr && ptr->proto() == IP_PROTO_UDP)
641            set(ptr.p, ptr.pstart());
642        else
643            set(0, 0);
644    }
645    void set(const Ip6Ptr &ptr)
646    {
647        if (ptr && ptr->proto() == IP_PROTO_UDP)
648            set(ptr.p, ptr.pstart());
649        else
650            set(0, 0);
651    }
652
653  public:
654    UdpPtr() : p(0), _off(0) {}
655    UdpPtr(const IpPtr &ptr) : p(0), _off(0) { set(ptr); }
656    UdpPtr(const Ip6Ptr &ptr) : p(0), _off(0) { set(ptr); }
657    UdpPtr(const UdpPtr &ptr) : p(ptr.p), _off(ptr._off) {}
658
659    UdpHdr *get() { return (UdpHdr *)(p->data + _off); }
660    UdpHdr *operator->() { return get(); }
661    UdpHdr &operator*() { return *get(); }
662
663    const UdpHdr *get() const { return (const UdpHdr *)(p->data + _off); }
664    const UdpHdr *operator->() const { return get(); }
665    const UdpHdr &operator*() const { return *get(); }
666
667    const UdpPtr &operator=(const IpPtr &i) { set(i); return *this; }
668    const UdpPtr &operator=(const UdpPtr &t)
669    { set(t.p, t._off); return *this; }
670
671    const EthPacketPtr packet() const { return p; }
672    EthPacketPtr packet() { return p; }
673    bool operator!() const { return !p; }
674    operator bool() const { return p; }
675    int off() const { return _off; }
676    int pstart() const { return off() + get()->size(); }
677};
678
679uint16_t __tu_cksum6(const Ip6Ptr &ip6);
680uint16_t __tu_cksum(const IpPtr &ip);
681uint16_t cksum(const UdpPtr &ptr);
682
683int hsplit(const EthPacketPtr &ptr);
684
685} // namespace Net
686
687#endif // __BASE_INET_HH__
688