#include <vnet/tcp/tcp.h>
#include <vnet/lisp-cp/packets.h>
+#include <math.h>
vlib_node_registration_t tcp4_output_node;
vlib_node_registration_t tcp6_output_node;
-typedef enum _tcp_output_nect
+typedef enum _tcp_output_next
{
TCP_OUTPUT_NEXT_DROP,
TCP_OUTPUT_NEXT_IP_LOOKUP,
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *);
- uword indent = format_get_indent (s);
+ u32 indent = format_get_indent (s);
s = format (s, "%U\n%U%U",
format_tcp_header, &t->tcp_header, 128,
format_white_space, indent,
- format_tcp_connection_verbose, &t->tcp_connection);
+ format_tcp_connection, &t->tcp_connection, 1);
return s;
}
static u8
-tcp_window_compute_scale (u32 available_space)
+tcp_window_compute_scale (u32 window)
{
u8 wnd_scale = 0;
- while (wnd_scale < TCP_MAX_WND_SCALE
- && (available_space >> wnd_scale) > TCP_WND_MAX)
+ while (wnd_scale < TCP_MAX_WND_SCALE && (window >> wnd_scale) > TCP_WND_MAX)
wnd_scale++;
return wnd_scale;
}
/**
- * TCP's IW as recommended by RFC6928
+ * Update max segment size we're able to process.
+ *
+ * The value is constrained by our interface's MTU and IP options. It is
+ * also what we advertise to our peer.
+ */
+void
+tcp_update_rcv_mss (tcp_connection_t * tc)
+{
+ /* TODO find our iface MTU */
+ tc->mss = dummy_mtu - sizeof (tcp_header_t);
+}
+
+/**
+ * TCP's initial window
*/
always_inline u32
tcp_initial_wnd_unscaled (tcp_connection_t * tc)
{
- return TCP_IW_N_SEGMENTS * tc->mss;
+ /* RFC 6928 recommends the value lower. However at the time our connections
+ * are initialized, fifos may not be allocated. Therefore, advertise the
+ * smallest possible unscaled window size and update once fifos are
+ * assigned to the session.
+ */
+ /*
+ tcp_update_rcv_mss (tc);
+ TCP_IW_N_SEGMENTS * tc->mss;
+ */
+ return TCP_MIN_RX_FIFO_SIZE;
}
/**
* Figure out how much space we have available
*/
available_space = stream_session_max_rx_enqueue (&tc->connection);
- max_fifo = stream_session_fifo_size (&tc->connection);
+ max_fifo = stream_session_rx_fifo_size (&tc->connection);
- ASSERT (tc->opt.mss < max_fifo);
- if (available_space < tc->opt.mss && available_space < max_fifo >> 3)
+ ASSERT (tc->rcv_opts.mss < max_fifo);
+ if (available_space < tc->rcv_opts.mss && available_space < max_fifo >> 3)
available_space = 0;
/*
opts->tsecr = 0;
len += TCP_OPTION_LEN_TIMESTAMP;
- opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
- len += TCP_OPTION_LEN_SACK_PERMITTED;
+ if (TCP_USE_SACKS)
+ {
+ opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
+ len += TCP_OPTION_LEN_SACK_PERMITTED;
+ }
/* Align to needed boundary */
len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN;
opts->mss = tc->mss;
len += TCP_OPTION_LEN_MSS;
- if (tcp_opts_wscale (&tc->opt))
+ if (tcp_opts_wscale (&tc->rcv_opts))
{
opts->flags |= TCP_OPTS_FLAG_WSCALE;
opts->wscale = tc->rcv_wscale;
len += TCP_OPTION_LEN_WINDOW_SCALE;
}
- if (tcp_opts_tstamp (&tc->opt))
+ if (tcp_opts_tstamp (&tc->rcv_opts))
{
opts->flags |= TCP_OPTS_FLAG_TSTAMP;
opts->tsval = tcp_time_now ();
len += TCP_OPTION_LEN_TIMESTAMP;
}
- if (tcp_opts_sack_permitted (&tc->opt))
+ if (tcp_opts_sack_permitted (&tc->rcv_opts))
{
opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED;
len += TCP_OPTION_LEN_SACK_PERMITTED;
opts->flags = 0;
- if (tcp_opts_tstamp (&tc->opt))
+ if (tcp_opts_tstamp (&tc->rcv_opts))
{
opts->flags |= TCP_OPTS_FLAG_TSTAMP;
opts->tsval = tcp_time_now ();
opts->tsecr = tc->tsval_recent;
len += TCP_OPTION_LEN_TIMESTAMP;
}
- if (tcp_opts_sack_permitted (&tc->opt))
+ if (tcp_opts_sack_permitted (&tc->rcv_opts))
{
if (vec_len (tc->snd_sacks))
{
case TCP_STATE_SYN_SENT:
return tcp_make_syn_options (opts, tc->rcv_wscale);
default:
- clib_warning ("Not handled!");
+ clib_warning ("State not handled! %d", state);
return 0;
}
}
-/**
- * Update max segment size we're able to process.
- *
- * The value is constrained by our interface's MTU and IP options. It is
- * also what we advertise to our peer.
- */
-void
-tcp_update_rcv_mss (tcp_connection_t * tc)
-{
- /* TODO find our iface MTU */
- tc->mss = dummy_mtu;
-}
-
/**
* Update snd_mss to reflect the effective segment size that we can send
* by taking into account all TCP options, including SACKs
tcp_make_options (tc, &tc->snd_opts, TCP_STATE_ESTABLISHED);
/* XXX check if MTU has been updated */
- tc->snd_mss = clib_min (tc->mss, tc->opt.mss) - tc->snd_opts_len;
+ tc->snd_mss = clib_min (tc->mss, tc->rcv_opts.mss) - tc->snd_opts_len;
+ ASSERT (tc->snd_mss > 0);
}
void
tcp_init_mss (tcp_connection_t * tc)
{
+ u16 default_min_mss = 536;
tcp_update_rcv_mss (tc);
/* TODO cache mss and consider PMTU discovery */
- tc->snd_mss = clib_min (tc->opt.mss, tc->mss);
+ tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss);
- if (tc->snd_mss == 0)
+ if (tc->snd_mss < 45)
{
clib_warning ("snd mss is 0");
- tc->snd_mss = tc->mss;
+ /* Assume that at least the min default mss works */
+ tc->snd_mss = default_min_mss;
+ tc->rcv_opts.mss = default_min_mss;
}
/* We should have enough space for 40 bytes of options */
ASSERT (tc->snd_mss > 45);
/* If we use timestamp option, account for it */
- if (tcp_opts_tstamp (&tc->opt))
+ if (tcp_opts_tstamp (&tc->rcv_opts))
tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
}
-#define tcp_get_free_buffer_index(tm, bidx) \
-do { \
- u32 *my_tx_buffers, n_free_buffers; \
- u32 thread_index = vlib_get_thread_index(); \
- my_tx_buffers = tm->tx_buffers[thread_index]; \
- if (PREDICT_FALSE(vec_len (my_tx_buffers) == 0)) \
- { \
- n_free_buffers = 32; /* TODO config or macro */ \
- vec_validate (my_tx_buffers, n_free_buffers - 1); \
- _vec_len(my_tx_buffers) = vlib_buffer_alloc_from_free_list ( \
- tm->vlib_main, my_tx_buffers, n_free_buffers, \
- VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX); \
- tm->tx_buffers[thread_index] = my_tx_buffers; \
- } \
- /* buffer shortage */ \
- if (PREDICT_FALSE (vec_len (my_tx_buffers) == 0)) \
- return; \
- *bidx = my_tx_buffers[_vec_len (my_tx_buffers)-1]; \
- _vec_len (my_tx_buffers) -= 1; \
-} while (0)
-
-#define tcp_return_buffer(tm) \
-do { \
- u32 *my_tx_buffers; \
- u32 thread_index = vlib_get_thread_index(); \
- my_tx_buffers = tm->tx_buffers[thread_index]; \
- _vec_len (my_tx_buffers) +=1; \
-} while (0)
+always_inline int
+tcp_alloc_tx_buffers (tcp_main_t * tm, u8 thread_index, u32 n_free_buffers)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ u32 current_length = vec_len (tm->tx_buffers[thread_index]);
+ u32 n_allocated;
+
+ vec_validate (tm->tx_buffers[thread_index],
+ current_length + n_free_buffers - 1);
+ n_allocated =
+ vlib_buffer_alloc (vm, &tm->tx_buffers[thread_index][current_length],
+ n_free_buffers);
+ _vec_len (tm->tx_buffers[thread_index]) = current_length + n_allocated;
+ /* buffer shortage, report failure */
+ if (vec_len (tm->tx_buffers[thread_index]) == 0)
+ {
+ clib_warning ("out of buffers");
+ return -1;
+ }
+ return 0;
+}
-always_inline void
-tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
+always_inline int
+tcp_get_free_buffer_index (tcp_main_t * tm, u32 * bidx)
{
- vlib_buffer_t *it = b;
- do
+ u32 *my_tx_buffers;
+ u32 thread_index = vlib_get_thread_index ();
+
+ TCP_DBG_BUFFER_ALLOC_MAYBE_FAIL (thread_index);
+
+ if (PREDICT_FALSE (vec_len (tm->tx_buffers[thread_index]) == 0))
{
- it->current_data = 0;
- it->current_length = 0;
- it->total_length_not_including_first_buffer = 0;
+ if (tcp_alloc_tx_buffers (tm, thread_index, VLIB_FRAME_SIZE))
+ return -1;
}
- while ((it->flags & VLIB_BUFFER_NEXT_PRESENT)
- && (it = vlib_get_buffer (vm, it->next_buffer)));
+ my_tx_buffers = tm->tx_buffers[thread_index];
+ *bidx = my_tx_buffers[vec_len (my_tx_buffers) - 1];
+ _vec_len (my_tx_buffers) -= 1;
+ return 0;
+}
+
+always_inline void
+tcp_return_buffer (tcp_main_t * tm)
+{
+ _vec_len (tm->tx_buffers[vlib_get_thread_index ()]) += 1;
+}
+
+always_inline void *
+tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
+{
+ if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
+ vlib_buffer_free_one (vm, b->next_buffer);
+ /* Zero all flags but free list index and trace flag */
+ b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
+ b->current_data = 0;
+ b->current_length = 0;
+ b->total_length_not_including_first_buffer = 0;
+ vnet_buffer (b)->tcp.flags = 0;
/* Leave enough space for headers */
- vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
+ return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
+}
+
+always_inline void *
+tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
+{
+ ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
+ b->flags &= VLIB_BUFFER_NON_DEFAULT_FREELIST;
+ b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
+ b->total_length_not_including_first_buffer = 0;
vnet_buffer (b)->tcp.flags = 0;
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
+ /* Leave enough space for headers */
+ return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
}
/**
/* Reset flags, make sure ack is sent */
vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
+}
- tc->snd_nxt += 1;
+/**
+ * Convert buffer to SYN
+ */
+void
+tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
+{
+ u8 tcp_hdr_opts_len, tcp_opts_len;
+ tcp_header_t *th;
+ u16 initial_wnd;
+ tcp_options_t snd_opts;
+
+ initial_wnd = tcp_initial_window_to_advertise (tc);
+
+ /* Make and write options */
+ memset (&snd_opts, 0, sizeof (snd_opts));
+ tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
+ tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
+
+ th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
+ tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
+ initial_wnd);
+ vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
+ tcp_options_write ((u8 *) (th + 1), &snd_opts);
}
/**
u8 tcp_opts_len, tcp_hdr_opts_len;
tcp_header_t *th;
u16 initial_wnd;
- u32 time_now;
memset (snd_opts, 0, sizeof (*snd_opts));
-
tcp_reuse_buffer (vm, b);
- /* Set random initial sequence */
- time_now = tcp_time_now ();
-
- tc->iss = random_u32 (&time_now);
- tc->snd_una = tc->iss;
- tc->snd_nxt = tc->iss + 1;
- tc->snd_una_max = tc->snd_nxt;
-
initial_wnd = tcp_initial_window_to_advertise (tc);
-
- /* Make and write options */
tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
tc->rcv_nxt, tcp_hdr_opts_len,
TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
-
tcp_options_write ((u8 *) (th + 1), snd_opts);
vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK;
- /* Init retransmit timer */
- tcp_retransmit_timer_set (tc);
+ /* Init retransmit timer. Use update instead of set because of
+ * retransmissions */
+ tcp_retransmit_timer_force_update (tc);
+ TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
}
always_inline void
-tcp_enqueue_to_ip_lookup (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
- u8 is_ip4)
+tcp_enqueue_to_ip_lookup_i (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
+ u8 is_ip4, u8 flush)
{
+ tcp_main_t *tm = vnet_get_tcp_main ();
+ u32 thread_index = vlib_get_thread_index ();
u32 *to_next, next_index;
vlib_frame_t *f;
- b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
+ b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
b->error = 0;
/* Default FIB for now */
- vnet_buffer (b)->sw_if_index[VLIB_TX] = 0;
+ vnet_buffer (b)->sw_if_index[VLIB_TX] = ~0;
/* Send to IP lookup */
next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
- f = vlib_get_frame_to_node (vm, next_index);
+ tcp_trajectory_add_start (b, 1);
+
+ f = tm->ip_lookup_tx_frames[!is_ip4][thread_index];
+ if (!f)
+ {
+ f = vlib_get_frame_to_node (vm, next_index);
+ ASSERT (f);
+ tm->ip_lookup_tx_frames[!is_ip4][thread_index] = f;
+ }
+
+ to_next = vlib_frame_vector_args (f);
+ to_next[f->n_vectors] = bi;
+ f->n_vectors += 1;
+ if (flush || f->n_vectors == VLIB_FRAME_SIZE)
+ {
+ vlib_put_frame_to_node (vm, next_index, f);
+ tm->ip_lookup_tx_frames[!is_ip4][thread_index] = 0;
+ }
+}
+
+always_inline void
+tcp_enqueue_to_ip_lookup_now (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
+ u8 is_ip4)
+{
+ tcp_enqueue_to_ip_lookup_i (vm, b, bi, is_ip4, 1);
+}
+
+always_inline void
+tcp_enqueue_to_ip_lookup (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
+ u8 is_ip4)
+{
+ tcp_enqueue_to_ip_lookup_i (vm, b, bi, is_ip4, 0);
+}
+
+always_inline void
+tcp_enqueue_to_output_i (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
+ u8 is_ip4, u8 flush)
+{
+ tcp_main_t *tm = vnet_get_tcp_main ();
+ u32 thread_index = vlib_get_thread_index ();
+ u32 *to_next, next_index;
+ vlib_frame_t *f;
+
+ b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
+ b->error = 0;
+
+ /* Decide where to send the packet */
+ next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
+ tcp_trajectory_add_start (b, 2);
- /* Enqueue the packet */
+ /* Get frame to v4/6 output node */
+ f = tm->tx_frames[!is_ip4][thread_index];
+ if (!f)
+ {
+ f = vlib_get_frame_to_node (vm, next_index);
+ ASSERT (f);
+ tm->tx_frames[!is_ip4][thread_index] = f;
+ }
to_next = vlib_frame_vector_args (f);
- to_next[0] = bi;
- f->n_vectors = 1;
- vlib_put_frame_to_node (vm, next_index, f);
+ to_next[f->n_vectors] = bi;
+ f->n_vectors += 1;
+ if (flush || f->n_vectors == VLIB_FRAME_SIZE)
+ {
+ vlib_put_frame_to_node (vm, next_index, f);
+ tm->tx_frames[!is_ip4][thread_index] = 0;
+ }
+}
+
+always_inline void
+tcp_enqueue_to_output (vlib_main_t * vm, vlib_buffer_t * b, u32 bi, u8 is_ip4)
+{
+ tcp_enqueue_to_output_i (vm, b, bi, is_ip4, 0);
+}
+
+always_inline void
+tcp_enqueue_to_output_now (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
+ u8 is_ip4)
+{
+ tcp_enqueue_to_output_i (vm, b, bi, is_ip4, 1);
}
int
}
tcp_reuse_buffer (vm, b0);
+ tcp_trajectory_add_start (b0, 4);
th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack,
sizeof (tcp_header_t), flags, 0);
if (is_ip4)
{
ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40,
- IP_PROTOCOL_TCP);
+ IP_PROTOCOL_TCP, 1);
th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4);
}
else
/**
* Send reset without reusing existing buffer
+ *
+ * It extracts connection info out of original packet
*/
void
-tcp_send_reset (vlib_buffer_t * pkt, u8 is_ip4)
+tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4)
{
vlib_buffer_t *b;
u32 bi;
ip4_header_t *ih4, *pkt_ih4;
ip6_header_t *ih6, *pkt_ih6;
- tcp_get_free_buffer_index (tm, &bi);
- b = vlib_get_buffer (vm, bi);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
- /* Leave enough space for headers */
- vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
+ b = vlib_get_buffer (vm, bi);
+ tcp_init_buffer (vm, b);
/* Make and write options */
tcp_hdr_len = sizeof (tcp_header_t);
{
flags = TCP_FLAG_RST;
seq = pkt_th->ack_number;
- ack = 0;
+ ack = (tc && tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0;
}
else
{
{
ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40);
ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address,
- &pkt_ih4->src_address, IP_PROTOCOL_TCP);
+ &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1);
th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
}
else
{
int bogus = ~0;
- pkt_ih6 = (ip6_header_t *) (pkt_th - 1);
ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
0x60);
- ih6 =
- vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
- &pkt_ih6->src_address, IP_PROTOCOL_TCP);
+ ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
+ &pkt_ih6->src_address, IP_PROTOCOL_TCP);
th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
ASSERT (!bogus);
}
- tcp_enqueue_to_ip_lookup (vm, b, bi, is_ip4);
+ tcp_enqueue_to_ip_lookup_now (vm, b, bi, is_ip4);
+ TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
+}
+
+/**
+ * Build and set reset packet for connection
+ */
+void
+tcp_send_reset (tcp_connection_t * tc)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ tcp_main_t *tm = vnet_get_tcp_main ();
+ vlib_buffer_t *b;
+ u32 bi;
+ tcp_header_t *th;
+ u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
+ u8 flags;
+
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
+ b = vlib_get_buffer (vm, bi);
+ tcp_init_buffer (vm, b);
+
+ tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
+ tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
+ advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
+ flags = TCP_FLAG_RST;
+ th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
+ tc->rcv_nxt, tcp_hdr_opts_len, flags,
+ advertise_wnd);
+ opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
+ ASSERT (opts_write_len == tc->snd_opts_len);
+ vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
+ if (tc->c_is_ip4)
+ {
+ ip4_header_t *ih4;
+ ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
+ &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
+ th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
+ }
+ else
+ {
+ int bogus = ~0;
+ ip6_header_t *ih6;
+ ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
+ &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
+ th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
+ ASSERT (!bogus);
+ }
+ tcp_enqueue_to_ip_lookup_now (vm, b, bi, tc->c_is_ip4);
+ TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
}
void
tcp_push_ip_hdr (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b)
{
tcp_header_t *th = vlib_buffer_get_current (b);
-
+ vlib_main_t *vm = vlib_get_main ();
if (tc->c_is_ip4)
{
ip4_header_t *ih;
- ih = vlib_buffer_push_ip4 (tm->vlib_main, b, &tc->c_lcl_ip4,
- &tc->c_rmt_ip4, IP_PROTOCOL_TCP);
- th->checksum = ip4_tcp_udp_compute_checksum (tm->vlib_main, b, ih);
+ ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4,
+ &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1);
+ th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih);
}
else
{
ip6_header_t *ih;
int bogus = ~0;
- ih = vlib_buffer_push_ip6 (tm->vlib_main, b, &tc->c_lcl_ip6,
+ ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6,
&tc->c_rmt_ip6, IP_PROTOCOL_TCP);
- th->checksum = ip6_tcp_udp_icmp_compute_checksum (tm->vlib_main, b, ih,
- &bogus);
+ th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus);
ASSERT (!bogus);
}
}
u32 bi;
tcp_main_t *tm = vnet_get_tcp_main ();
vlib_main_t *vm = vlib_get_main ();
- u8 tcp_hdr_opts_len, tcp_opts_len;
- tcp_header_t *th;
- u32 time_now;
- u16 initial_wnd;
- tcp_options_t snd_opts;
- tcp_get_free_buffer_index (tm, &bi);
- b = vlib_get_buffer (vm, bi);
-
- /* Leave enough space for headers */
- vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
-
- /* Set random initial sequence */
- time_now = tcp_time_now ();
-
- tc->iss = random_u32 (&time_now);
- tc->snd_una = tc->iss;
- tc->snd_una_max = tc->snd_nxt = tc->iss + 1;
-
- initial_wnd = tcp_initial_window_to_advertise (tc);
-
- /* Make and write options */
- memset (&snd_opts, 0, sizeof (snd_opts));
- tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
- tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
+ /*
+ * Setup retransmit and establish timers before requesting buffer
+ * such that we can return if we've ran out.
+ */
+ tcp_timer_set (tc, TCP_TIMER_ESTABLISH, TCP_ESTABLISH_TIME);
+ tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
+ tc->rto * TCP_TO_TIMER_TICK);
- th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
- tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
- initial_wnd);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
- tcp_options_write ((u8 *) (th + 1), &snd_opts);
+ b = vlib_get_buffer (vm, bi);
+ tcp_init_buffer (vm, b);
+ tcp_make_syn (tc, b);
/* Measure RTT with this */
tc->rtt_ts = tcp_time_now ();
tc->rtt_seq = tc->snd_nxt;
-
- /* Start retransmit trimer */
- tcp_timer_set (tc, TCP_TIMER_RETRANSMIT_SYN, tc->rto * TCP_TO_TIMER_TICK);
tc->rto_boff = 0;
- /* Set the connection establishment timer */
- tcp_timer_set (tc, TCP_TIMER_ESTABLISH, TCP_ESTABLISH_TIME);
-
tcp_push_ip_hdr (tm, tc, b);
tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4);
+ TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
}
-always_inline void
-tcp_enqueue_to_output (vlib_main_t * vm, vlib_buffer_t * b, u32 bi, u8 is_ip4)
+/**
+ * Flush tx frame populated by retransmits and timer pops
+ */
+void
+tcp_flush_frame_to_output (vlib_main_t * vm, u8 thread_index, u8 is_ip4)
{
- u32 *to_next, next_index;
- vlib_frame_t *f;
-
- b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
- b->error = 0;
+ if (tcp_main.tx_frames[!is_ip4][thread_index])
+ {
+ u32 next_index;
+ next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
+ vlib_put_frame_to_node (vm, next_index,
+ tcp_main.tx_frames[!is_ip4][thread_index]);
+ tcp_main.tx_frames[!is_ip4][thread_index] = 0;
+ }
+}
- /* Decide where to send the packet */
- next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
+/**
+ * Flush ip lookup tx frames populated by timer pops
+ */
+always_inline void
+tcp_flush_frame_to_ip_lookup (vlib_main_t * vm, u8 thread_index, u8 is_ip4)
+{
+ if (tcp_main.ip_lookup_tx_frames[!is_ip4][thread_index])
+ {
+ u32 next_index;
+ next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
+ vlib_put_frame_to_node (vm, next_index,
+ tcp_main.ip_lookup_tx_frames[!is_ip4]
+ [thread_index]);
+ tcp_main.ip_lookup_tx_frames[!is_ip4][thread_index] = 0;
+ }
+}
- /* Enqueue the packet */
- f = vlib_get_frame_to_node (vm, next_index);
- to_next = vlib_frame_vector_args (f);
- to_next[0] = bi;
- f->n_vectors = 1;
- vlib_put_frame_to_node (vm, next_index, f);
+/**
+ * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
+ */
+void
+tcp_flush_frames_to_output (u8 thread_index)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ tcp_flush_frame_to_output (vm, thread_index, 1);
+ tcp_flush_frame_to_output (vm, thread_index, 0);
+ tcp_flush_frame_to_ip_lookup (vm, thread_index, 1);
+ tcp_flush_frame_to_ip_lookup (vm, thread_index, 0);
}
/**
void
tcp_send_fin (tcp_connection_t * tc)
{
- vlib_buffer_t *b;
- u32 bi;
tcp_main_t *tm = vnet_get_tcp_main ();
vlib_main_t *vm = vlib_get_main ();
+ vlib_buffer_t *b;
+ u32 bi;
+ u8 fin_snt = 0;
- tcp_get_free_buffer_index (tm, &bi);
+ tcp_retransmit_timer_force_update (tc);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
b = vlib_get_buffer (vm, bi);
-
- /* Leave enough space for headers */
- vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
-
+ fin_snt = tc->flags & TCP_CONN_FINSNT;
+ if (fin_snt)
+ tc->snd_nxt = tc->snd_una;
tcp_make_fin (tc, b);
- tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
- tc->flags |= TCP_CONN_FINSNT;
+ tcp_enqueue_to_output_now (vm, b, bi, tc->c_is_ip4);
+ if (!fin_snt)
+ {
+ tc->flags |= TCP_CONN_FINSNT;
+ tc->flags &= ~TCP_CONN_FINPNDG;
+ /* Account for the FIN */
+ tc->snd_una_max += 1;
+ tc->snd_nxt = tc->snd_una_max;
+ }
+ else
+ {
+ tc->snd_nxt = tc->snd_una_max;
+ }
TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
}
always_inline u8
-tcp_make_state_flags (tcp_state_t next_state)
+tcp_make_state_flags (tcp_connection_t * tc, tcp_state_t next_state)
{
switch (next_state)
{
return TCP_FLAG_SYN;
case TCP_STATE_LAST_ACK:
case TCP_STATE_FIN_WAIT_1:
- return TCP_FLAG_FIN;
+ if (tc->snd_nxt + 1 < tc->snd_una_max)
+ return TCP_FLAG_ACK;
+ else
+ return TCP_FLAG_FIN;
default:
clib_warning ("Shouldn't be here!");
}
tcp_header_t *th;
data_len = b->current_length + b->total_length_not_including_first_buffer;
+ ASSERT (!b->total_length_not_including_first_buffer
+ || (b->flags & VLIB_BUFFER_NEXT_PRESENT));
vnet_buffer (b)->tcp.flags = 0;
if (compute_opts)
tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
- /* Write pre-computed options */
tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
-
- /* Get rcv window to advertise */
advertise_wnd = tcp_window_to_advertise (tc, next_state);
- flags = tcp_make_state_flags (next_state);
+ flags = tcp_make_state_flags (tc, next_state);
/* Push header and options */
th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
tc->rcv_nxt, tcp_hdr_opts_len, flags,
advertise_wnd);
-
opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
ASSERT (opts_write_len == tc->snd_opts_len);
-
- /* Tag the buffer with the connection index */
vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
+ /*
+ * Update connection variables
+ */
+
tc->snd_nxt += data_len;
tc->rcv_las = tc->rcv_nxt;
/* TODO this is updated in output as well ... */
- if (tc->snd_nxt > tc->snd_una_max)
- tc->snd_una_max = tc->snd_nxt;
-
- if (tc->rtt_ts == 0)
+ if (seq_gt (tc->snd_nxt, tc->snd_una_max))
{
- tc->rtt_ts = tcp_time_now ();
- tc->rtt_seq = tc->snd_nxt;
+ tc->snd_una_max = tc->snd_nxt;
+ tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
}
+
TCP_EVT_DBG (TCP_EVT_PKTIZE, tc);
}
u32 bi;
/* Get buffer */
- tcp_get_free_buffer_index (tm, &bi);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
b = vlib_get_buffer (vm, bi);
/* Fill in the ACK */
tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
}
-/* Send delayed ACK when timer expires */
+/**
+ * Delayed ack timer handler
+ *
+ * Sends delayed ACK when timer expires
+ */
void
tcp_timer_delack_handler (u32 index)
{
tcp_send_ack (tc);
}
-/** Build a retransmit segment
+/**
+ * Build a retransmit segment
*
* @return the number of bytes in the segment or 0 if there's nothing to
* retransmit
- * */
+ */
u32
-tcp_prepare_retransmit_segment (tcp_connection_t * tc, vlib_buffer_t * b,
- u32 offset, u32 max_bytes)
+tcp_prepare_retransmit_segment (tcp_connection_t * tc, u32 offset,
+ u32 max_deq_bytes, vlib_buffer_t ** b)
{
+ tcp_main_t *tm = vnet_get_tcp_main ();
vlib_main_t *vm = vlib_get_main ();
- u32 n_bytes = 0;
-
- tcp_reuse_buffer (vm, b);
+ int n_bytes = 0;
+ u32 start, bi, available_bytes, seg_size;
+ u8 *data;
ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
- ASSERT (max_bytes != 0);
+ ASSERT (max_deq_bytes != 0);
- max_bytes = clib_min (tc->snd_mss, max_bytes);
+ /*
+ * Make sure we can retransmit something
+ */
+ available_bytes = stream_session_tx_fifo_max_dequeue (&tc->connection);
+ ASSERT (available_bytes >= offset);
+ available_bytes -= offset;
+ if (!available_bytes)
+ return 0;
+ max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
+ max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
/* Start is beyond snd_congestion */
- if (seq_geq (tc->snd_una + offset, tc->snd_congestion))
+ start = tc->snd_una + offset;
+ if (seq_geq (start, tc->snd_congestion))
goto done;
/* Don't overshoot snd_congestion */
- if (seq_gt (tc->snd_nxt + max_bytes, tc->snd_congestion))
+ if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
{
- max_bytes = tc->snd_congestion - tc->snd_nxt;
- if (max_bytes == 0)
+ max_deq_bytes = tc->snd_congestion - start;
+ if (max_deq_bytes == 0)
goto done;
}
+ seg_size = max_deq_bytes + MAX_HDRS_LEN;
+
+ /*
+ * Prepare options
+ */
tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
- ASSERT (max_bytes <= tc->snd_mss);
+ /*
+ * Allocate and fill in buffer(s)
+ */
- n_bytes = stream_session_peek_bytes (&tc->connection,
- vlib_buffer_get_current (b), offset,
- max_bytes);
- ASSERT (n_bytes != 0);
- b->current_length = n_bytes;
- tcp_push_hdr_i (tc, b, tc->state, 0);
- tc->rtx_bytes += n_bytes;
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return 0;
+ *b = vlib_get_buffer (vm, bi);
+ data = tcp_init_buffer (vm, *b);
+
+ /* Easy case, buffer size greater than mss */
+ if (PREDICT_TRUE (seg_size <= tm->bytes_per_buffer))
+ {
+ n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
+ max_deq_bytes);
+ ASSERT (n_bytes == max_deq_bytes);
+ b[0]->current_length = n_bytes;
+ tcp_push_hdr_i (tc, *b, tc->state, 0);
+ }
+ /* Split mss into multiple buffers */
+ else
+ {
+ u32 chain_bi = ~0, n_bufs_per_seg;
+ u32 thread_index = vlib_get_thread_index ();
+ u16 n_peeked, len_to_deq, available_bufs;
+ vlib_buffer_t *chain_b, *prev_b;
+ int i;
+
+ n_bufs_per_seg = ceil ((double) seg_size / tm->bytes_per_buffer);
+
+ /* Make sure we have enough buffers */
+ available_bufs = vec_len (tm->tx_buffers[thread_index]);
+ if (n_bufs_per_seg > available_bufs)
+ {
+ if (tcp_alloc_tx_buffers (tm, thread_index,
+ VLIB_FRAME_SIZE - available_bufs))
+ {
+ tcp_return_buffer (tm);
+ *b = 0;
+ return 0;
+ }
+ }
+
+ n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
+ tm->bytes_per_buffer -
+ MAX_HDRS_LEN);
+ b[0]->current_length = n_bytes;
+ b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
+ b[0]->total_length_not_including_first_buffer = 0;
+ max_deq_bytes -= n_bytes;
+
+ chain_b = *b;
+ for (i = 1; i < n_bufs_per_seg; i++)
+ {
+ prev_b = chain_b;
+ len_to_deq = clib_min (max_deq_bytes, tm->bytes_per_buffer);
+ tcp_get_free_buffer_index (tm, &chain_bi);
+ ASSERT (chain_bi != (u32) ~ 0);
+ chain_b = vlib_get_buffer (vm, chain_bi);
+ chain_b->current_data = 0;
+ data = vlib_buffer_get_current (chain_b);
+ n_peeked = stream_session_peek_bytes (&tc->connection, data,
+ offset + n_bytes, len_to_deq);
+ ASSERT (n_peeked == len_to_deq);
+ n_bytes += n_peeked;
+ chain_b->current_length = n_peeked;
+ chain_b->flags &= VLIB_BUFFER_NON_DEFAULT_FREELIST;
+ chain_b->next_buffer = 0;
+
+ /* update previous buffer */
+ prev_b->next_buffer = chain_bi;
+ prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
+
+ max_deq_bytes -= n_peeked;
+ b[0]->total_length_not_including_first_buffer += n_peeked;
+ }
+
+ tcp_push_hdr_i (tc, *b, tc->state, 0);
+ }
+
+ ASSERT (n_bytes > 0);
+ ASSERT (((*b)->current_data + (*b)->current_length) <=
+ tm->bytes_per_buffer);
+
+ if (tcp_in_fastrecovery (tc))
+ tc->snd_rxt_bytes += n_bytes;
done:
TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes);
static void
tcp_rtx_timeout_cc (tcp_connection_t * tc)
{
+ tc->prev_ssthresh = tc->ssthresh;
+ tc->prev_cwnd = tc->cwnd;
+
/* Cleanly recover cc (also clears up fast retransmit) */
if (tcp_in_fastrecovery (tc))
- {
- tcp_cc_recover (tc);
- }
- else
- {
- tc->ssthresh = clib_max (tcp_flight_size (tc) / 2, 2 * tc->snd_mss);
- }
+ tcp_cc_fastrecovery_exit (tc);
/* Start again from the beginning */
-
+ tc->ssthresh = clib_max (tcp_flight_size (tc) / 2, 2 * tc->snd_mss);
tc->cwnd = tcp_loss_wnd (tc);
tc->snd_congestion = tc->snd_una_max;
+ tc->rtt_ts = 0;
tcp_recovery_on (tc);
}
vlib_main_t *vm = vlib_get_main ();
u32 thread_index = vlib_get_thread_index ();
tcp_connection_t *tc;
- vlib_buffer_t *b;
+ vlib_buffer_t *b = 0;
u32 bi, n_bytes;
if (is_syn)
{
tc = tcp_half_open_connection_get (index);
+ /* Note: the connection may have transitioned to ESTABLISHED... */
+ if (PREDICT_FALSE (tc == 0))
+ return;
+ tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
}
else
{
tc = tcp_connection_get (index, thread_index);
+ /* Note: the connection may have been closed and pool_put */
+ if (PREDICT_FALSE (tc == 0))
+ return;
+ tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
}
- /* Make sure timer handle is set to invalid */
- tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
+ if (tc->state >= TCP_STATE_ESTABLISHED)
+ {
+ /* Lost FIN, retransmit and return */
+ if (tcp_is_lost_fin (tc))
+ {
+ tcp_send_fin (tc);
+ tc->rto_boff += 1;
+ tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
+ return;
+ }
- /* Increment RTO backoff (also equal to number of retries) */
- tc->rto_boff += 1;
+ /* Shouldn't be here */
+ if (tc->snd_una == tc->snd_una_max)
+ {
+ tcp_recovery_off (tc);
+ return;
+ }
- /* Go back to first un-acked byte */
- tc->snd_nxt = tc->snd_una;
+ /* We're not in recovery so make sure rto_boff is 0 */
+ if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
+ {
+ tc->rto_boff = 0;
+ tcp_update_rto (tc);
+ }
- /* Get buffer */
- tcp_get_free_buffer_index (tm, &bi);
- b = vlib_get_buffer (vm, bi);
+ /* Increment RTO backoff (also equal to number of retries) and go back
+ * to first un-acked byte */
+ tc->rto_boff += 1;
- if (tc->state >= TCP_STATE_ESTABLISHED)
- {
/* First retransmit timeout */
if (tc->rto_boff == 1)
tcp_rtx_timeout_cc (tc);
- /* Exponential backoff */
+ tc->snd_nxt = tc->snd_una;
tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
- /* Send one segment. No fancy recovery for now! */
- n_bytes = tcp_prepare_retransmit_segment (tc, b, 0, tc->snd_mss);
+ /* Send one segment. Note that n_bytes may be zero due to buffer shortfall */
+ n_bytes = tcp_prepare_retransmit_segment (tc, 0, tc->snd_mss, &b);
+
+ /* TODO be less aggressive about this */
scoreboard_clear (&tc->sack_sb);
if (n_bytes == 0)
{
- clib_warning ("could not retransmit");
+ tcp_retransmit_timer_set (tc);
return;
}
+
+ bi = vlib_get_buffer_index (vm, b);
+
+ /* For first retransmit, record timestamp (Eifel detection RFC3522) */
+ if (tc->rto_boff == 1)
+ tc->snd_rxt_ts = tcp_time_now ();
+
+ tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
+ tcp_retransmit_timer_update (tc);
}
- else
+ /* Retransmit for SYN */
+ else if (tc->state == TCP_STATE_SYN_SENT)
{
- /* Retransmit for SYN/SYNACK */
- ASSERT (tc->state == TCP_STATE_SYN_RCVD
- || tc->state == TCP_STATE_SYN_SENT);
+ /* Half-open connection actually moved to established but we were
+ * waiting for syn retransmit to pop to call cleanup from the right
+ * thread. */
+ if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
+ {
+ if (tcp_half_open_connection_cleanup (tc))
+ {
+ clib_warning ("could not remove half-open connection");
+ ASSERT (0);
+ }
+ return;
+ }
/* Try without increasing RTO a number of times. If this fails,
* start growing RTO exponentially */
+ tc->rto_boff += 1;
if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
- vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
+ tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
+ tc->rto * TCP_TO_TIMER_TICK);
- tcp_push_hdr_i (tc, b, tc->state, 1);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
- /* Account for the SYN */
- tc->snd_nxt += 1;
- }
+ b = vlib_get_buffer (vm, bi);
+ tcp_init_buffer (vm, b);
+ tcp_make_syn (tc, b);
- if (!is_syn)
- {
- tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
+ tc->rtt_ts = 0;
+ TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
- /* Re-enable retransmit timer */
- tcp_retransmit_timer_set (tc);
+ /* This goes straight to ipx_lookup. Retransmit timer set already */
+ tcp_push_ip_hdr (tm, tc, b);
+ tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4);
}
- else
+ /* Retransmit SYN-ACK */
+ else if (tc->state == TCP_STATE_SYN_RCVD)
{
- ASSERT (tc->state == TCP_STATE_SYN_SENT);
+ tc->rto_boff += 1;
+ if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
+ tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
+ tc->rtt_ts = 0;
- TCP_EVT_DBG (TCP_EVT_SYN_RTX, tc);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ {
+ tcp_retransmit_timer_force_update (tc);
+ return;
+ }
- /* This goes straight to ipx_lookup */
- tcp_push_ip_hdr (tm, tc, b);
- tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4);
+ b = vlib_get_buffer (vm, bi);
+ tcp_make_synack (tc, b);
+ TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
- /* Re-enable retransmit timer */
- tcp_timer_set (tc, TCP_TIMER_RETRANSMIT_SYN,
- tc->rto * TCP_TO_TIMER_TICK);
+ /* Retransmit timer already updated, just enqueue to output */
+ tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
+ }
+ else
+ {
+ ASSERT (tc->state == TCP_STATE_CLOSED);
+ return;
}
}
u32 thread_index = vlib_get_thread_index ();
tcp_connection_t *tc;
vlib_buffer_t *b;
- u32 bi, n_bytes;
+ u32 bi, max_snd_bytes, available_bytes, offset;
+ int n_bytes = 0;
+ u8 *data;
- tc = tcp_connection_get (index, thread_index);
+ tc = tcp_connection_get_if_valid (index, thread_index);
+
+ if (!tc)
+ return;
/* Make sure timer handle is set to invalid */
tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
/* Problem already solved or worse */
- if (tc->snd_wnd > tc->snd_mss || tcp_in_recovery (tc))
+ if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
+ || tc->snd_wnd > tc->snd_mss || tcp_in_recovery (tc))
return;
+ available_bytes = stream_session_tx_fifo_max_dequeue (&tc->connection);
+ offset = tc->snd_una_max - tc->snd_una;
+
+ /* Reprogram persist if no new bytes available to send. We may have data
+ * next time */
+ if (!available_bytes)
+ {
+ tcp_persist_timer_set (tc);
+ return;
+ }
+
+ if (available_bytes <= offset)
+ {
+ ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
+ return;
+ }
+
/* Increment RTO backoff */
tc->rto_boff += 1;
tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
- /* Try to force the first unsent segment */
- tcp_get_free_buffer_index (tm, &bi);
+ /*
+ * Try to force the first unsent segment (or buffer)
+ */
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
b = vlib_get_buffer (vm, bi);
- tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
- n_bytes = stream_session_peek_bytes (&tc->connection,
- vlib_buffer_get_current (b),
- tc->snd_una_max - tc->snd_una,
- tc->snd_mss);
- /* Nothing to send */
- if (n_bytes == 0)
- {
- tcp_return_buffer (tm);
- return;
- }
+ data = tcp_init_buffer (vm, b);
+ tcp_validate_txf_size (tc, offset);
+ tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
+ max_snd_bytes = clib_min (tc->snd_mss, tm->bytes_per_buffer - MAX_HDRS_LEN);
+ n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
+ max_snd_bytes);
b->current_length = n_bytes;
+ ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
+ || tc->snd_nxt == tc->snd_una_max
+ || tc->rto_boff > 1));
+
tcp_push_hdr_i (tc, b, tc->state, 0);
tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
- /* Re-enable persist timer */
- tcp_persist_timer_set (tc);
+ /* Just sent new data, enable retransmit */
+ tcp_retransmit_timer_update (tc);
}
/**
void
tcp_retransmit_first_unacked (tcp_connection_t * tc)
{
- tcp_main_t *tm = vnet_get_tcp_main ();
vlib_main_t *vm = vlib_get_main ();
vlib_buffer_t *b;
- u32 bi, n_bytes;
+ u32 bi, old_snd_nxt, n_bytes;
+ old_snd_nxt = tc->snd_nxt;
tc->snd_nxt = tc->snd_una;
- /* Get buffer */
- tcp_get_free_buffer_index (tm, &bi);
- b = vlib_get_buffer (vm, bi);
-
TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
-
- n_bytes = tcp_prepare_retransmit_segment (tc, b, 0, tc->snd_mss);
- if (n_bytes == 0)
- goto done;
-
+ n_bytes = tcp_prepare_retransmit_segment (tc, 0, tc->snd_mss, &b);
+ if (!n_bytes)
+ return;
+ bi = vlib_get_buffer_index (vm, b);
tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
-done:
- tc->snd_nxt = tc->snd_una_max;
+ tc->snd_nxt = old_snd_nxt;
}
-sack_scoreboard_hole_t *
-scoreboard_first_rtx_hole (sack_scoreboard_t * sb)
-{
- sack_scoreboard_hole_t *hole = 0;
-
-// hole = scoreboard_first_hole (&tc->sack_sb);
-// if (hole)
-// {
-//
-// offset = hole->start - tc->snd_una;
-// hole_size = hole->end - hole->start;
-//
-// ASSERT(hole_size);
-//
-// if (hole_size < max_bytes)
-// max_bytes = hole_size;
-// }
- return hole;
+/**
+ * Do fast retransmit with SACKs
+ */
+void
+tcp_fast_retransmit_sack (tcp_connection_t * tc)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ u32 n_written = 0, offset, max_bytes;
+ vlib_buffer_t *b = 0;
+ sack_scoreboard_hole_t *hole;
+ sack_scoreboard_t *sb;
+ u32 bi, old_snd_nxt;
+ int snd_space;
+ u8 snd_limited = 0, can_rescue = 0;
+
+ ASSERT (tcp_in_fastrecovery (tc));
+ TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
+
+ old_snd_nxt = tc->snd_nxt;
+ sb = &tc->sack_sb;
+ snd_space = tcp_available_snd_space (tc);
+
+ hole = scoreboard_get_hole (sb, sb->cur_rxt_hole);
+ while (hole && snd_space > 0)
+ {
+ hole = scoreboard_next_rxt_hole (sb, hole,
+ tcp_fastrecovery_sent_1_smss (tc),
+ &can_rescue, &snd_limited);
+ if (!hole)
+ {
+ if (!can_rescue || !(seq_lt (sb->rescue_rxt, tc->snd_una)
+ || seq_gt (sb->rescue_rxt,
+ tc->snd_congestion)))
+ break;
+
+ /* If rescue rxt undefined or less than snd_una then one segment of
+ * up to SMSS octets that MUST include the highest outstanding
+ * unSACKed sequence number SHOULD be returned, and RescueRxt set to
+ * RecoveryPoint. HighRxt MUST NOT be updated.
+ */
+ max_bytes = clib_min (tc->snd_mss,
+ tc->snd_congestion - tc->snd_una);
+ max_bytes = clib_min (max_bytes, snd_space);
+ offset = tc->snd_congestion - tc->snd_una - max_bytes;
+ sb->rescue_rxt = tc->snd_congestion;
+ tc->snd_nxt = tc->snd_una + offset;
+ n_written = tcp_prepare_retransmit_segment (tc, offset, max_bytes,
+ &b);
+ ASSERT (n_written);
+ bi = vlib_get_buffer_index (vm, b);
+ tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
+ break;
+ }
+
+ max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
+ max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
+ if (max_bytes == 0)
+ break;
+ offset = sb->high_rxt - tc->snd_una;
+ tc->snd_nxt = sb->high_rxt;
+ n_written = tcp_prepare_retransmit_segment (tc, offset, max_bytes, &b);
+
+ /* Nothing left to retransmit */
+ if (n_written == 0)
+ break;
+
+ bi = vlib_get_buffer_index (vm, b);
+ sb->high_rxt += n_written;
+ tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
+ ASSERT (n_written <= snd_space);
+ snd_space -= n_written;
+ }
+
+ /* If window allows, send 1 SMSS of new data */
+ tc->snd_nxt = old_snd_nxt;
}
/**
- * Do fast retransmit.
+ * Fast retransmit without SACK info
*/
void
-tcp_fast_retransmit (tcp_connection_t * tc)
+tcp_fast_retransmit_no_sack (tcp_connection_t * tc)
{
- tcp_main_t *tm = vnet_get_tcp_main ();
vlib_main_t *vm = vlib_get_main ();
- u32 bi;
+ u32 n_written = 0, offset = 0, bi, old_snd_nxt;
int snd_space;
- u32 n_written = 0, offset = 0;
vlib_buffer_t *b;
- u8 use_sacks = 0;
ASSERT (tcp_in_fastrecovery (tc));
+ TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
/* Start resending from first un-acked segment */
+ old_snd_nxt = tc->snd_nxt;
tc->snd_nxt = tc->snd_una;
-
snd_space = tcp_available_snd_space (tc);
- TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0);
-
- /* If we have SACKs use them */
- if (tcp_opts_sack_permitted (&tc->opt)
- && scoreboard_first_hole (&tc->sack_sb))
- use_sacks = 0;
while (snd_space > 0)
{
- tcp_get_free_buffer_index (tm, &bi);
- b = vlib_get_buffer (vm, bi);
-
- if (use_sacks)
- {
- scoreboard_first_rtx_hole (&tc->sack_sb);
- }
- else
- {
- offset += n_written;
- }
-
- n_written = tcp_prepare_retransmit_segment (tc, b, offset, snd_space);
+ offset += n_written;
+ n_written = tcp_prepare_retransmit_segment (tc, offset, snd_space, &b);
/* Nothing left to retransmit */
if (n_written == 0)
- {
- tcp_return_buffer (tm);
- break;
- }
+ break;
+ bi = vlib_get_buffer_index (vm, b);
tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
snd_space -= n_written;
}
- /* If window allows, send 1 SMSS of new data */
- if (seq_lt (tc->snd_nxt, tc->snd_congestion))
- tc->snd_nxt = tc->snd_congestion;
+ /* Restore snd_nxt. If window allows, send 1 SMSS of new data */
+ tc->snd_nxt = old_snd_nxt;
+}
+
+/**
+ * Do fast retransmit
+ */
+void
+tcp_fast_retransmit (tcp_connection_t * tc)
+{
+ if (tcp_opts_sack_permitted (&tc->rcv_opts)
+ && scoreboard_first_hole (&tc->sack_sb))
+ tcp_fast_retransmit_sack (tc);
+ else
+ tcp_fast_retransmit_no_sack (tc);
}
always_inline u32
tcp_session_has_ooo_data (tcp_connection_t * tc)
{
- stream_session_t *s =
- stream_session_get (tc->c_s_index, tc->c_thread_index);
+ stream_session_t *s = session_get (tc->c_s_index, tc->c_thread_index);
return svm_fifo_has_ooo_data (s->server_rx_fifo);
}
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
-
next_index = node->cached_next_index;
+ tcp_set_time_now (my_thread_index);
while (n_left_from > 0)
{
if (is_ip4)
{
- ip4_header_t *ih0;
- ih0 = vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4,
- &tc0->c_rmt_ip4, IP_PROTOCOL_TCP);
- th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih0);
+ vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
+ IP_PROTOCOL_TCP, 1);
+ b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
+ vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
+ th0->checksum = 0;
}
else
{
ip6_header_t *ih0;
- int bogus = ~0;
-
ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
&tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
- th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih0,
- &bogus);
- ASSERT (!bogus);
+ b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
+ vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
+ vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
+ th0->checksum = 0;
}
/* Filter out DUPACKs if there are no OOO segments left */
/* Stop DELACK timer and fix flags */
tc0->flags &= ~(TCP_CONN_SNDACK);
- if (tcp_timer_is_active (tc0, TCP_TIMER_DELACK))
- {
- tcp_timer_reset (tc0, TCP_TIMER_DELACK);
- }
+ tcp_timer_reset (tc0, TCP_TIMER_DELACK);
/* If not retransmitting
* 1) update snd_una_max (SYN, SYNACK, FIN)
tc0->rto_boff = 0;
}
- /* set fib index to default and lookup node */
- /* XXX network virtualization (vrf/vni) */
+#if 0
+ /* Make sure we haven't lost route to our peer */
+ if (PREDICT_FALSE (tc0->last_fib_check
+ < tc0->snd_opts.tsval + TCP_FIB_RECHECK_PERIOD))
+ {
+ if (PREDICT_TRUE
+ (tc0->c_rmt_fei == tcp_lookup_rmt_in_fib (tc0)))
+ {
+ tc0->last_fib_check = tc0->snd_opts.tsval;
+ }
+ else
+ {
+ clib_warning ("lost connection to peer");
+ tcp_connection_reset (tc0);
+ goto done;
+ }
+ }
+
+ /* Use pre-computed dpo to set next node */
+ next0 = tc0->c_rmt_dpo.dpoi_next_node;
+ vnet_buffer (b0)->ip.adj_index[VLIB_TX] = tc0->c_rmt_dpo.dpoi_index;
+#endif
+
vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
- vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
- b0->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
+ b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
done:
b0->error = node->errors[error0];
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
tc = (tcp_connection_t *) tconn;
tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, 0);
+ ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
+
+ if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
+ {
+ tc->rtt_ts = tcp_time_now ();
+ tc->rtt_seq = tc->snd_nxt;
+ }
+ tcp_trajectory_add_start (b, 3);
return 0;
}
}
/* Prepare to send to IP lookup */
- vnet_buffer (b0)->sw_if_index[VLIB_TX] = 0;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
next0 = TCP_RESET_NEXT_IP_LOOKUP;
done:
b0->error = node->errors[error0];
- b0->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
+ b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
th0 = vlib_buffer_get_current (b0);
Code Review / vpp.git / blobdiff