netstack
A network stack implementation for BareMetal OS.
The goals of the project are this:
- Provide a full stack implementation from ethernet to HTTP
- Avoid dynamic buffer resizing, which reduces performance and security
- Avoid arbitrary compile-time limits to allow scalability
- Allow usage in both kernel and user space to increase reusability
- Allow the integration of custom protocol implementations
Applications:
- Kernel development
- Virtual networking
- High performance networking software
Building
There are multiple build systems for the project.
You can build with the shell scripts:
./build.sh
./test.sh
With GNU Make:
make
make test
Or with CMake:
mkdir build
cd build
cmake ..
cmake --build .
ctest --verbose --output-on-failure
Usage
Here's an example of how to setup a TCP/IPv6 stack:
#include <netstack/stack.h>
int main(void)
{
struct netstack_stack stack;
netstack_stack_init(&stack);
int err = 0;
err |= netstack_stack_push_ethernet(&stack);
err |= netstack_stack_push_ipv6(&stack);
err |= netstack_stack_push_tcp(&stack);
if (err != 0)
{
fprintf(stderr, "Failed to construct network stack.\n");
netstack_stack_done(&stack);
return EXIT_FAILURE;
}
/* modify protocol parameters */
/* application */
netstack_stack_done(&stack);
}
Once the stack is setup, you might want to modify the protocol parameters.
For example, check the MAC address, IP address or port numbers.
You use the netstack_mutator structure to do this.
Here's an example:
int setup_ethernet(const void *mutator_data,
struct netstack_ethernet *ethernet)
{
// See 'setup_stack' about the data
// pointer.
(void) mutator_data;
const char dst_mac[] = "ff:aa:ee:bb:dd:cc";
int err = netstack_ethernet_set_source(ethernet, src_mac, sizeof(src_mac) - 1);
if (err != 0)
return err;
const char src_mac[] = "00:11:22:33:44:55";
err = netstack_ethernet_set_destination(ethernet, dst_mac, sizeof(dst_mac) - 1);
if (err != 0)
return err;
return 0;
}
int setup_ipv6(const void *mutator_data,
struct netstack_ipv6 *ipv6)
{
(void) mutator_data;
(void) ipv6;
return 0;
}
int setup_tcp(const void *mutator_data,
struct netstack_tcp *tcp)
{
(void) mutator_data;
int err = netstack_tcp_set_source(tcp, "80", 2);
if (err != 0)
return err;
err = netstack_tcp_set_destination(tcp, "80", 2);
if (err != 0)
return err;
return 0;
}
int setup_stack(struct netstack_stack *stack)
{
struct netstack_mutator mutator;
netstack_mutator_init(&mutator);
// The init function sets this to null,
// but if you wanted to pass parameters
// to the setup functions, you'd pass it
// here.
mutator.data = NULL;
mutator.mutate_ethernet = setup_ethernet;
mutator.mutate_ipv6 = setup_ipv6;
mutator.mutate_tcp = setup_tcp;
return netstack_stack_mutate(stack, &mutator);
}
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