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net_channel.cc
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net_channel.cc
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/*
* Copyright (C) 2014 Cloudius Systems, Ltd.
*
* This work is open source software, licensed under the terms of the
* BSD license as described in the LICENSE file in the top-level directory.
*/
#include <osv/net_channel.hh>
#include <osv/poll.h>
#include <bsd/sys/sys/mbuf.h>
#include <bsd/sys/net/ethernet.h>
#include <bsd/sys/netinet/ip.h>
#include <bsd/sys/netinet/ip.h>
#include <bsd/sys/netinet/tcp.h>
#include <bsd/sys/net/ethernet.h>
#include <bsd/sys/net/netisr.h>
#include <osv/debug.hh>
#include <osv/net_trace.hh>
std::ostream& operator<<(std::ostream& os, in_addr ia)
{
auto x = ntohl(ia.s_addr);
return osv::fprintf(os, "%d.%d.%d.%d",
(x >> 24) & 255, (x >> 16) & 255, (x >> 8) & 255, x & 255);
}
std::ostream& operator<<(std::ostream& os, ipv4_tcp_conn_id id)
{
return osv::fprintf(os, "{ ipv4 %s:%d -> %s:%d }", id.src_addr, id.src_port, id.dst_addr, id.dst_port);
}
void net_channel::process_queue()
{
mbuf* m;
while (_queue.pop(m)) {
_process_packet(m);
}
}
void net_channel::wake_pollers()
{
WITH_LOCK(osv::rcu_read_lock) {
auto pl = _pollers.read();
if (pl) {
for (pollreq* pr : *pl) {
// net_channel is self synchronizing
pr->_awake.store(true, std::memory_order_relaxed);
pr->_poll_thread.wake();
}
}
// can't call epoll_wake from rcu, so copy the data
if (!_epollers.empty()) {
_epollers.reader_for_each([&] (const epoll_ptr& ep) {
epoll_wake_in_rcu(ep);
});
}
}
}
void net_channel::add_poller(pollreq& pr)
{
WITH_LOCK(_pollers_mutex) {
auto old = _pollers.read_by_owner();
std::unique_ptr<std::vector<pollreq*>> neww{new std::vector<pollreq*>};
if (old) {
*neww = *old;
}
neww->push_back(&pr);
_pollers.assign(neww.release());
osv::rcu_dispose(old);
}
}
void net_channel::del_poller(pollreq& pr)
{
WITH_LOCK(_pollers_mutex) {
auto old = _pollers.read_by_owner();
std::unique_ptr<std::vector<pollreq*>> neww{new std::vector<pollreq*>};
if (old) {
*neww = *old;
}
neww->erase(std::remove(neww->begin(), neww->end(), &pr), neww->end());
_pollers.assign(neww.release());
osv::rcu_dispose(old);
}
}
void net_channel::add_epoll(const epoll_ptr& ep)
{
WITH_LOCK(_pollers_mutex) {
if (!_epollers.owner_find(ep)) {
_epollers.insert(ep);
}
}
}
void net_channel::del_epoll(const epoll_ptr& ep)
{
WITH_LOCK(_pollers_mutex) {
auto i = _epollers.owner_find(ep);
if (i) {
_epollers.erase(i);
}
}
}
classifier::classifier()
{
}
void classifier::add(ipv4_tcp_conn_id id, net_channel* channel)
{
WITH_LOCK(_mtx) {
_ipv4_tcp_channels.emplace(id, channel);
}
}
void classifier::remove(ipv4_tcp_conn_id id)
{
WITH_LOCK(_mtx) {
auto i = _ipv4_tcp_channels.owner_find(id,
std::hash<ipv4_tcp_conn_id>(), key_item_compare());
assert(i);
_ipv4_tcp_channels.erase(i);
}
}
bool classifier::post_packet(mbuf* m)
{
WITH_LOCK(osv::rcu_read_lock) {
if (auto nc = classify_ipv4_tcp(m)) {
log_packet_in(m, NETISR_ETHER);
if (!nc->push(m)) {
return false;
}
// FIXME: find a way to batch wakes
nc->wake();
return true;
}
}
return false;
}
// must be called with rcu lock held
net_channel* classifier::classify_ipv4_tcp(mbuf* m)
{
caddr_t h = m->m_hdr.mh_data;
if (unsigned(m->m_hdr.mh_len) < ETHER_HDR_LEN + sizeof(ip)) {
return nullptr;
}
auto ether_hdr = reinterpret_cast<ether_header*>(h);
if (ntohs(ether_hdr->ether_type) != ETHERTYPE_IP) {
return nullptr;
}
h += ETHER_HDR_LEN;
auto ip_hdr = reinterpret_cast<ip*>(h);
unsigned ip_size = ip_hdr->ip_hl << 2;
if (ip_size < sizeof(ip)) {
return nullptr;
}
if (ip_hdr->ip_p != IPPROTO_TCP) {
return nullptr;
}
if (ntohs(ip_hdr->ip_off) & ~IP_DF) {
return nullptr;
}
auto src_addr = ip_hdr->ip_src;
auto dst_addr = ip_hdr->ip_dst;
h += ip_size;
auto tcp_hdr = reinterpret_cast<tcphdr*>(h);
if (tcp_hdr->th_flags & (TH_SYN | TH_FIN | TH_RST)) {
return nullptr;
}
auto src_port = ntohs(tcp_hdr->th_sport);
auto dst_port = ntohs(tcp_hdr->th_dport);
auto id = ipv4_tcp_conn_id{src_addr, dst_addr, src_port, dst_port};
auto i = _ipv4_tcp_channels.reader_find(id,
std::hash<ipv4_tcp_conn_id>(), key_item_compare());
if (!i) {
return nullptr;
}
return i->chan;
}