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authorFlorin Coras <fcoras@cisco.com>2018-04-26 08:26:52 -0700
committerDamjan Marion <dmarion.lists@gmail.com>2018-05-17 06:29:13 +0000
commitf9d0568344b4766bc1ddc1be9a7e9afd00e2d832 (patch)
tree6266d507999c3fff98c6d8da849c0b4b9ed116a6
parent78c568905724af785e90185fd89fa8717b3b35c2 (diff)
tcp: handle link-local addresses
Change-Id: I9ede6bc861350c7d9e78fa4d96cd584c2816d06f Signed-off-by: Florin Coras <fcoras@cisco.com>
-rw-r--r--src/vnet/adj/adj_nbr.c2
-rw-r--r--src/vnet/adj/adj_nbr.h8
-rw-r--r--src/vnet/tcp/tcp.h1
-rw-r--r--src/vnet/tcp/tcp_error.def3
-rw-r--r--src/vnet/tcp/tcp_input.c2
-rw-r--r--src/vnet/tcp/tcp_output.c67
6 files changed, 75 insertions, 8 deletions
diff --git a/src/vnet/adj/adj_nbr.c b/src/vnet/adj/adj_nbr.c
index 29cd8123414..eff7d4ce1fb 100644
--- a/src/vnet/adj/adj_nbr.c
+++ b/src/vnet/adj/adj_nbr.c
@@ -93,7 +93,7 @@ adj_nbr_remove (adj_index_t ai,
BV(clib_bihash_add_del) (adj_nbr_tables[nh_proto][sw_if_index], &kv, 0);
}
-static adj_index_t
+adj_index_t
adj_nbr_find (fib_protocol_t nh_proto,
vnet_link_t link_type,
const ip46_address_t *nh_addr,
diff --git a/src/vnet/adj/adj_nbr.h b/src/vnet/adj/adj_nbr.h
index 293766b8519..5d0f8444ec3 100644
--- a/src/vnet/adj/adj_nbr.h
+++ b/src/vnet/adj/adj_nbr.h
@@ -162,6 +162,14 @@ adj_nbr_walk_nh6 (u32 sw_if_index,
void *ctx);
/**
+ * @brief Lookup neighbor adjancency.
+ */
+adj_index_t
+adj_nbr_find (fib_protocol_t nh_proto,
+ vnet_link_t link_type,
+ const ip46_address_t *nh_addr,
+ u32 sw_if_index);
+/**
* @brief
* Module initialisation
*/
diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h
index 8a6f74ab13a..837b5b4d0d2 100644
--- a/src/vnet/tcp/tcp.h
+++ b/src/vnet/tcp/tcp.h
@@ -305,6 +305,7 @@ typedef struct _tcp_connection
u16 mss; /**< Our max seg size that includes options */
u32 limited_transmit; /**< snd_nxt when limited transmit starts */
u32 last_fib_check; /**< Last time we checked fib route for peer */
+ u32 sw_if_index; /**< Interface for the connection */
} tcp_connection_t;
struct _tcp_cc_algorithm
diff --git a/src/vnet/tcp/tcp_error.def b/src/vnet/tcp/tcp_error.def
index 8f006dfc287..44bf0c04168 100644
--- a/src/vnet/tcp/tcp_error.def
+++ b/src/vnet/tcp/tcp_error.def
@@ -44,4 +44,5 @@ tcp_error (FILTERED, "Packets filtered")
tcp_error (OPTIONS, "Could not parse options")
tcp_error (PAWS, "PAWS check failed")
tcp_error (RCV_WND, "Segment not in receive window")
-tcp_error (FIN_RCVD, "FINs received") \ No newline at end of file
+tcp_error (FIN_RCVD, "FINs received")
+tcp_error (LINK_LOCAL_RW, "No rewrite for link local connection") \ No newline at end of file
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index 497b709bec0..42db82e1214 100644
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -2126,6 +2126,7 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
new_tc0->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID;
new_tc0->timers[TCP_TIMER_RETRANSMIT_SYN] =
TCP_TIMER_HANDLE_INVALID;
+ new_tc0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
/* If this is not the owning thread, wait for syn retransmit to
* expire and cleanup then */
@@ -2818,6 +2819,7 @@ tcp46_listen_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
child0->irs = vnet_buffer (b0)->tcp.seq_number;
child0->rcv_nxt = vnet_buffer (b0)->tcp.seq_number + 1;
child0->rcv_las = child0->rcv_nxt;
+ child0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
/* RFC1323: TSval timestamps sent on {SYN} and {SYN,ACK}
* segments are used to initialize PAWS. */
diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index df882bc5ff1..fe6d09c2c0e 100644
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -24,16 +24,22 @@ typedef enum _tcp_output_next
{
TCP_OUTPUT_NEXT_DROP,
TCP_OUTPUT_NEXT_IP_LOOKUP,
+ TCP_OUTPUT_NEXT_IP_REWRITE,
+ TCP_OUTPUT_NEXT_IP_ARP,
TCP_OUTPUT_N_NEXT
} tcp_output_next_t;
#define foreach_tcp4_output_next \
_ (DROP, "error-drop") \
- _ (IP_LOOKUP, "ip4-lookup")
+ _ (IP_LOOKUP, "ip4-lookup") \
+ _ (IP_REWRITE, "ip4-rewrite") \
+ _ (IP_ARP, "ip4-arp")
#define foreach_tcp6_output_next \
_ (DROP, "error-drop") \
- _ (IP_LOOKUP, "ip6-lookup")
+ _ (IP_LOOKUP, "ip6-lookup") \
+ _ (IP_REWRITE, "ip6-rewrite") \
+ _ (IP_ARP, "ip6-discover-neighbor")
static char *tcp_error_strings[] = {
#define tcp_error(n,s) s,
@@ -1747,6 +1753,53 @@ tcp_session_has_ooo_data (tcp_connection_t * tc)
return svm_fifo_has_ooo_data (s->server_rx_fifo);
}
+typedef struct
+{
+ fib_protocol_t nh_proto;
+ vnet_link_t link_type;
+ ip46_address_t ip;
+ u32 sw_if_index;
+} tcp_adj_add_args_t;
+
+void
+tcp_output_add_adj (tcp_adj_add_args_t * args)
+{
+ adj_nbr_add_or_lock (args->nh_proto, args->link_type, &args->ip,
+ args->sw_if_index);
+}
+
+static void
+tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
+ u32 * next0, u32 * error0)
+{
+ ip_adjacency_t *adj;
+ adj_index_t ai;
+
+ ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
+ tc0->sw_if_index);
+ if (ai == ADJ_INDEX_INVALID)
+ {
+ tcp_adj_add_args_t args = {
+ .nh_proto = FIB_PROTOCOL_IP6,
+ .link_type = VNET_LINK_IP6,
+ .ip = tc0->c_rmt_ip,
+ .sw_if_index = tc0->sw_if_index
+ };
+ vlib_rpc_call_main_thread (tcp_output_add_adj, (u8 *) & args,
+ sizeof (args));
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
+ *next0 = TCP_OUTPUT_NEXT_DROP;
+ *error0 = TCP_ERROR_LINK_LOCAL_RW;
+ return;
+ }
+
+ adj = adj_get (ai);
+ if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)
+ *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
+ else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
+ *next0 = TCP_OUTPUT_NEXT_IP_ARP;
+}
+
always_inline uword
tcp46_output_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
@@ -1802,6 +1855,8 @@ tcp46_output_inline (vlib_main_t * vm,
th0 = vlib_buffer_get_current (b0);
TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
+ vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
if (is_ip4)
{
@@ -1820,6 +1875,10 @@ tcp46_output_inline (vlib_main_t * vm,
vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
th0->checksum = 0;
+
+ if (PREDICT_FALSE
+ (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
+ tcp_output_handle_link_local (tc0, b0, &next0, &error0);
}
/* Filter out DUPACKs if there are no OOO segments left */
@@ -1889,10 +1948,6 @@ tcp46_output_inline (vlib_main_t * vm,
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] = tc0->c_fib_index;
-
- b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
done:
b0->error = node->errors[error0];
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))