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net: write accessors for Ipv4_packet

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Also adds header-checksum calculation function.

Fixes #1915
This commit is contained in:
Johannes Schlatow 2016-03-18 19:41:00 +01:00 committed by Christian Helmuth
parent bed870ead4
commit 27a73b89f0
2 changed files with 31 additions and 0 deletions
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16
repos/os/include/net/ipv4.h
View File

@ -60,6 +60,8 @@ class Net::Ipv4_packet
static Ipv4_address ip_from_string(const char *ip);
static Genode::uint16_t calculate_checksum(Ipv4_packet const &packet);
private:
/************************
@ -161,6 +163,20 @@ class Net::Ipv4_packet
template <typename T> T * data() { return (T *)(_data); }
template <typename T> T const * data() const { return (T const *)(_data); }
/********************************
** IPv4 field write-accessors **
********************************/
void version(Genode::size_t version) { _version = version; }
void header_length(Genode::size_t len) { _header_length = len; }
void total_length(Genode::uint16_t len) { _total_length = host_to_big_endian(len); }
void time_to_live(Genode::uint8_t ttl) { _time_to_live = ttl; }
void checksum(Genode::uint16_t checksum) { _header_checksum = host_to_big_endian(checksum); }
void dst(Ipv4_address ip) { ip.copy(&_dst_addr); }
void src(Ipv4_address ip) { ip.copy(&_src_addr); }
/***************
** Operators **

15
repos/os/src/lib/net/ipv4.cc
View File

@ -62,6 +62,21 @@ Ipv4_packet::Ipv4_address Ipv4_packet::ip_from_string(const char *ip)
return ip_addr;
}
Genode::uint16_t Ipv4_packet::calculate_checksum(Ipv4_packet const &packet)
{
Genode::uint16_t const *data = packet.header<Genode::uint16_t>();
Genode::uint32_t const sum = host_to_big_endian(data[0])
+ host_to_big_endian(data[1])
+ host_to_big_endian(data[2])
+ host_to_big_endian(data[3])
+ host_to_big_endian(data[4])
+ host_to_big_endian(data[6])
+ host_to_big_endian(data[7])
+ host_to_big_endian(data[8])
+ host_to_big_endian(data[9]);
return ~((0xFFFF & sum) + (sum >> 16));
}
const Ipv4_packet::Ipv4_address Ipv4_packet::CURRENT((Genode::uint8_t)0x00);
const Ipv4_packet::Ipv4_address Ipv4_packet::BROADCAST((Genode::uint8_t)0xFF);