static vertex *vertex_split(hedge *h, vector v)
{
hedge *h2, *hn1, *hn2;
vertex *vtxn;
edge *en;
face *f1;
f1 = h->f;
h2 = partner(h);
vtxn = vertex_new(f1->s, v);
hn1 = hedge_new(h, vtxn);
vtxn->h = hn1;
hn2 = hedge_new(h2, vtxn);
hn2->e = h->e;
if(h2->e->left == h2)
h2->e->left = hn2;
else
h2->e->right = hn2;
en = edge_new(f1->s);
en->left = hn1;
en->right = h2;
hn1->e = en;
h2->e = en;
return vtxn;
}
// find out if this packet is initiator or responder. called from accept_packet, so partner should be set
void tcp_stream_t::find_direction(packet_t *packet, const layer_t *tcplay)
{
const tcphdr &hdr = reinterpret_cast<const tcphdr &>(*tcplay->data());
if (have_partner() && partner()->d_direction != direction_unknown)
d_direction = (partner()->d_direction == direction_initiator ? direction_responder : direction_initiator);
else
{
if (hdr.th_flags & TH_SYN)
d_direction = (hdr.th_flags & TH_ACK ? direction_responder : direction_initiator);
else // assume the server is the one with the lower port nubmer
d_direction = (htons(hdr.th_sport) > htons(hdr.th_dport) ? direction_initiator : direction_responder);
if (have_partner())
partner()->d_direction = (d_direction == direction_initiator ? direction_responder : direction_initiator);
}
assert(d_direction == direction_initiator || d_direction == direction_responder);
}
Receiver::Rcv_state
Receiver::sender_ok(const Sender *sender) const
{
unsigned ipc_state = state() & Thread_ipc_mask;
// If Thread_send_in_progress is still set, we're still in the send phase
if (EXPECT_FALSE(ipc_state != Thread_receive_wait))
return vcpu_async_ipc(sender);
// Check open wait; test if this sender is really the first in queue
if (EXPECT_TRUE(!partner()
&& (_sender_list.empty()
|| sender->is_head_of(&_sender_list))))
return Rs_ipc_receive;
// Check closed wait; test if this sender is really who we specified
if (EXPECT_TRUE(sender == partner()))
return Rs_ipc_receive;
return Rs_not_receiving;
}
uint64_t tcp_stream_t::timeout() const
{
bool use_short = d_have_accepted_end;
uint64_t r = d_highest_ts.tv_sec;
tcp_stream_t *our_partner = NULL;
if (have_partner())
{
our_partner = partner();
use_short = use_short || our_partner->d_have_accepted_end;
uint64_t o = our_partner->d_highest_ts.tv_sec;
if (o > r)
r = o;
}
r += (use_short ? 60 : 600);
return r;
}
static inline void vertex_calcnormal(vertex *vtx, jigglystruct *js)
{
hedge *start = vtx->h, *h=start;
vector_init(vtx->n, 0, 0, 0);
do {
vector u, v, norm;
vector_sub(h->prev->vtx->v, vtx->v, u);
vector_sub(h->next->vtx->v, vtx->v, v);
cross(u, v, norm);
vector_add_to(vtx->n, norm);
h = partner(h)->next;
} while(h != start);
if(!js->spooky)
normalize(vtx->n);
else
vector_scale(vtx->n, js->spooky);
}
int mincut::run(graph& G)
{
graph g;
g.make_undirected();
// Make a local copy of the graph as mincut modifies the original graph
// List of nodes in the original graph
node_map <node> partner (G);
node_map <node> orig (g);
node x;
int counter = 0;
forall_nodes (x, G)
{
partner[x] = g.new_node();
orig[partner[x]] = x; // so we can look up original node
}
// add a packet, will either queue it in d_delayed, or accept it
bool tcp_stream_t::add(packet_t *packet, const layer_t *tcplay)
{
assert(tcplay);
if (packet->ts() > d_highest_ts)
d_highest_ts = packet->ts();
const tcphdr &hdr = reinterpret_cast<const tcphdr &>(*tcplay->data());
if (unlikely(d_trust_seq && !is_reasonable_seq(d_next_seq, htonl(hdr.th_seq))))
{
listener()->debug_packet(packet, "unreasonable large offset in sequence numbers. quick port re-use");
return false; // quick port re-use, packet not part of this stream
}
if (!is_partner_set() && hdr.th_flags & TH_ACK)
{
seq_nr_t ack(htonl(hdr.th_ack));
if (d_smallest_ack == 0 || ack < d_smallest_ack)
d_smallest_ack = ack;
}
bool check_partner_delayed = false;
if (!d_trust_seq)
{ // check if we already have a starting packet
find_relyable_startseq(hdr);
if (d_trust_seq && have_delayed())
listener()->debug_packet(packet,
"accepted sequence number %08x as start of stream",
d_next_seq.d_val);
if (have_partner() && d_smallest_ack != 0)
{
check_partner_delayed = partner()->find_seq_from_ack(d_smallest_ack);
if (check_partner_delayed)
listener()->debug_packet(packet,
"our ack's matched with partner's seq. will accept partner's delayed packets");
}
}
seq_nr_t seq(htonl(hdr.th_seq));
// if we know where the packet should go -> do it
if (d_trust_seq && is_partner_set()) // partner is also set if we gave up looking
{
if (seq <= d_next_seq)
accept_packet(packet, tcplay);
else
{
listener()->debug_packet(packet, "delaying packet because it has sequence "
"number in the future (got %08x, expected %08x)",
seq.d_val, d_next_seq.d_val);
d_delayed.insert(delayed_t::value_type(seq, packet));
}
}
else
{
if (is_partner_set())
listener()->debug_packet(packet, "delaying packet because we don't trust "
"sequence numbers yet (got %08x, current guess %08x)",
seq.d_val, d_next_seq.d_val);
else
listener()->debug_packet(packet, "delaying packet because we don't have a partner yet");
d_delayed.insert(delayed_t::value_type(seq, packet));
}
// we have reason to believe our partner can continue now
if (check_partner_delayed)
{
listener()->debug_packet(partner()->d_delayed.begin()->second, "accepting partner because we decided so earlier");
partner()->check_delayed(false);
}
// fallback, don't queue too much
if (d_delayed.size() > MAX_DELAYED_PACKETS)
{
if (!d_trust_seq)
listener()->debug_packet(packet, "unable to find reasonable starting sequence, "
"forcing first packet");
d_trust_seq = true; // if this wasn't set yet, it was seriously screwed up
check_delayed(true);
}
return true; // packet belonged to this stream
}
PUBLIC inline
bool
Receiver::in_ipc(Sender *sender)
{
return (state() & Thread_receive_in_progress) && (partner() == sender);
}