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INET: Add functions to header types to get offset in packet and start of payload; add function to split packet at last known header

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This commit is contained in:
Ali Saidi 2009-01-06 10:36:56 -05:00
parent 9f89d43b65
commit 11ac0c7acf
2 changed files with 47 additions and 16 deletions
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21
src/base/inet.cc
View file

@ -206,4 +206,25 @@ TcpOpt::sack(vector<SackRange> &vec) const
return false;
}
int
hsplit(const EthPacketPtr &ptr)
{
int split_point = 0;
IpPtr ip(ptr);
if (ip) {
split_point = ip.pstart();
TcpPtr tcp(ip);
if (tcp)
split_point = tcp.pstart();
UdpPtr udp(ip);
if (udp)
split_point = udp.pstart();
}
return split_point;
}
/* namespace Net */ }

42
src/base/inet.hh
View file

@ -140,6 +140,8 @@ class EthPtr
EthPacketPtr packet() { return p; }
bool operator!() const { return !p; }
operator bool() const { return p; }
int off() const { return 0; }
int pstart() const { return off() + ((const EthHdr*)p->data)->size(); }
};
/*
@ -216,6 +218,8 @@ class IpPtr
EthPacketPtr packet() { return p; }
bool operator!() const { return !p; }
operator bool() const { return p; }
int off() const { return sizeof(eth_hdr); }
int pstart() const { return off() + get()->size(); }
};
uint16_t cksum(const IpPtr &ptr);
@ -279,9 +283,9 @@ class TcpPtr
{
protected:
EthPacketPtr p;
int off;
int _off;
void set(const EthPacketPtr &ptr, int offset) { p = ptr; off = offset; }
void set(const EthPacketPtr &ptr, int offset) { p = ptr; _off = offset; }
void set(const IpPtr &ptr)
{
if (ptr && ptr->proto() == IP_PROTO_TCP)
@ -291,25 +295,27 @@ class TcpPtr
}
public:
TcpPtr() : p(0), off(0) {}
TcpPtr(const IpPtr &ptr) : p(0), off(0) { set(ptr); }
TcpPtr(const TcpPtr &ptr) : p(ptr.p), off(ptr.off) {}
TcpPtr() : p(0), _off(0) {}
TcpPtr(const IpPtr &ptr) : p(0), _off(0) { set(ptr); }
TcpPtr(const TcpPtr &ptr) : p(ptr.p), _off(ptr._off) {}
TcpHdr *get() { return (TcpHdr *)(p->data + off); }
TcpHdr *get() { return (TcpHdr *)(p->data + _off); }
TcpHdr *operator->() { return get(); }
TcpHdr &operator*() { return *get(); }
const TcpHdr *get() const { return (const TcpHdr *)(p->data + off); }
const TcpHdr *get() const { return (const TcpHdr *)(p->data + _off); }
const TcpHdr *operator->() const { return get(); }
const TcpHdr &operator*() const { return *get(); }
const TcpPtr &operator=(const IpPtr &i) { set(i); return *this; }
const TcpPtr &operator=(const TcpPtr &t) { set(t.p, t.off); return *this; }
const TcpPtr &operator=(const TcpPtr &t) { set(t.p, t._off); return *this; }
const EthPacketPtr packet() const { return p; }
EthPacketPtr packet() { return p; }
bool operator!() const { return !p; }
operator bool() const { return p; }
int off() const { return _off; }
int pstart() const { return off() + get()->size(); }
};
uint16_t cksum(const TcpPtr &ptr);
@ -366,9 +372,9 @@ class UdpPtr
{
protected:
EthPacketPtr p;
int off;
int _off;
void set(const EthPacketPtr &ptr, int offset) { p = ptr; off = offset; }
void set(const EthPacketPtr &ptr, int offset) { p = ptr; _off = offset; }
void set(const IpPtr &ptr)
{
if (ptr && ptr->proto() == IP_PROTO_UDP)
@ -378,29 +384,33 @@ class UdpPtr
}
public:
UdpPtr() : p(0), off(0) {}
UdpPtr(const IpPtr &ptr) : p(0), off(0) { set(ptr); }
UdpPtr(const UdpPtr &ptr) : p(ptr.p), off(ptr.off) {}
UdpPtr() : p(0), _off(0) {}
UdpPtr(const IpPtr &ptr) : p(0), _off(0) { set(ptr); }
UdpPtr(const UdpPtr &ptr) : p(ptr.p), _off(ptr._off) {}
UdpHdr *get() { return (UdpHdr *)(p->data + off); }
UdpHdr *get() { return (UdpHdr *)(p->data + _off); }
UdpHdr *operator->() { return get(); }
UdpHdr &operator*() { return *get(); }
const UdpHdr *get() const { return (const UdpHdr *)(p->data + off); }
const UdpHdr *get() const { return (const UdpHdr *)(p->data + _off); }
const UdpHdr *operator->() const { return get(); }
const UdpHdr &operator*() const { return *get(); }
const UdpPtr &operator=(const IpPtr &i) { set(i); return *this; }
const UdpPtr &operator=(const UdpPtr &t) { set(t.p, t.off); return *this; }
const UdpPtr &operator=(const UdpPtr &t) { set(t.p, t._off); return *this; }
const EthPacketPtr packet() const { return p; }
EthPacketPtr packet() { return p; }
bool operator!() const { return !p; }
operator bool() const { return p; }
int off() const { return _off; }
int pstart() const { return off() + get()->size(); }
};
uint16_t cksum(const UdpPtr &ptr);
int hsplit(const EthPacketPtr &ptr);
/* namespace Net */ }
#endif // __BASE_INET_HH__