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authorMatus Fabian <matfabia@cisco.com>2017-09-04 02:17:18 -0700
committerOle Trøan <otroan@employees.org>2017-09-06 08:49:25 +0000
commit704018cf117b6667f08b09d6db5fbec105bf6d57 (patch)
tree27a52337f4b5f35092a422290998f7c37b4071f7 /src/plugins/nat/out2in.c
parent030ab4815f777d6a0fdbfbc457e0f55fc32df8d3 (diff)
NAT: Destination NAT44 with load-balancing (VPP-954)
added load-balancing static mappings with unequal load support Change-Id: Ie505e41f24d46f812b94dd28bdafe3dc170a6060 Signed-off-by: Matus Fabian <matfabia@cisco.com>
Diffstat (limited to 'src/plugins/nat/out2in.c')
-rw-r--r--src/plugins/nat/out2in.c205
1 files changed, 194 insertions, 11 deletions
diff --git a/src/plugins/nat/out2in.c b/src/plugins/nat/out2in.c
index 679500668c5..55a750e4187 100644
--- a/src/plugins/nat/out2in.c
+++ b/src/plugins/nat/out2in.c
@@ -630,7 +630,7 @@ snat_out2in_unknown_proto (snat_main_t *sm,
snat_session_key_t m_key;
u32 old_addr, new_addr;
ip_csum_t sum;
- snat_unk_proto_ses_key_t key;
+ nat_ed_ses_key_t key;
snat_session_t * s;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
snat_user_key_t u_key;
@@ -643,11 +643,12 @@ snat_out2in_unknown_proto (snat_main_t *sm,
key.r_addr = ip->src_address;
key.fib_index = rx_fib_index;
key.proto = ip->protocol;
- key.rsvd[0] = key.rsvd[1] = key.rsvd[2] = 0;
+ key.rsvd = 0;
+ key.l_port = 0;
s_kv.key[0] = key.as_u64[0];
s_kv.key[1] = key.as_u64[1];
- if (!clib_bihash_search_16_8 (&sm->out2in_unk_proto, &s_kv, &s_value))
+ if (!clib_bihash_search_16_8 (&sm->out2in_ed, &s_kv, &s_value))
{
s = pool_elt_at_index (tsm->sessions, s_value.value);
new_addr = ip->dst_address.as_u32 = s->in2out.addr.as_u32;
@@ -721,14 +722,14 @@ snat_out2in_unknown_proto (snat_main_t *sm,
/* Add to lookup tables */
s_kv.value = s - tsm->sessions;
- if (clib_bihash_add_del_16_8 (&sm->out2in_unk_proto, &s_kv, 1))
+ if (clib_bihash_add_del_16_8 (&sm->out2in_ed, &s_kv, 1))
clib_warning ("out2in key add failed");
key.l_addr = ip->dst_address;
key.fib_index = m->fib_index;
s_kv.key[0] = key.as_u64[0];
s_kv.key[1] = key.as_u64[1];
- if (clib_bihash_add_del_16_8 (&sm->in2out_unk_proto, &s_kv, 1))
+ if (clib_bihash_add_del_16_8 (&sm->in2out_ed, &s_kv, 1))
clib_warning ("in2out key add failed");
}
@@ -749,6 +750,152 @@ snat_out2in_unknown_proto (snat_main_t *sm,
s->per_user_index);
}
+static void
+snat_out2in_lb (snat_main_t *sm,
+ vlib_buffer_t * b,
+ ip4_header_t * ip,
+ u32 rx_fib_index,
+ u32 thread_index,
+ f64 now,
+ vlib_main_t * vm)
+{
+ nat_ed_ses_key_t key;
+ clib_bihash_kv_16_8_t s_kv, s_value;
+ udp_header_t *udp = ip4_next_header (ip);
+ tcp_header_t *tcp = (tcp_header_t *) udp;
+ snat_session_t *s = 0;
+ snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
+ snat_session_key_t e_key, l_key;
+ clib_bihash_kv_8_8_t kv, value;
+ u32 old_addr, new_addr;
+ u32 proto = ip_proto_to_snat_proto (ip->protocol);
+ u16 new_port, old_port;
+ ip_csum_t sum;
+ snat_user_key_t u_key;
+ snat_user_t *u;
+ dlist_elt_t *head, *elt;
+
+ old_addr = ip->dst_address.as_u32;
+
+ key.l_addr = ip->dst_address;
+ key.r_addr = ip->src_address;
+ key.fib_index = rx_fib_index;
+ key.proto = ip->protocol;
+ key.rsvd = 0;
+ key.l_port = udp->dst_port;
+ s_kv.key[0] = key.as_u64[0];
+ s_kv.key[1] = key.as_u64[1];
+
+ if (!clib_bihash_search_16_8 (&sm->out2in_ed, &s_kv, &s_value))
+ {
+ s = pool_elt_at_index (tsm->sessions, s_value.value);
+ }
+ else
+ {
+ e_key.addr = ip->dst_address;
+ e_key.port = udp->dst_port;
+ e_key.protocol = proto;
+ e_key.fib_index = rx_fib_index;
+ if (snat_static_mapping_match(sm, e_key, &l_key, 1, 0))
+ return;
+
+ u_key.addr = l_key.addr;
+ u_key.fib_index = l_key.fib_index;
+ kv.key = u_key.as_u64;
+
+ /* Ever heard of the "user" = src ip4 address before? */
+ if (clib_bihash_search_8_8 (&sm->user_hash, &kv, &value))
+ {
+ /* no, make a new one */
+ pool_get (tsm->users, u);
+ memset (u, 0, sizeof (*u));
+ u->addr = l_key.addr;
+ u->fib_index = l_key.fib_index;
+
+ pool_get (tsm->list_pool, head);
+ u->sessions_per_user_list_head_index = head - tsm->list_pool;
+
+ clib_dlist_init (tsm->list_pool,
+ u->sessions_per_user_list_head_index);
+
+ kv.value = u - tsm->users;
+
+ /* add user */
+ if (clib_bihash_add_del_8_8 (&sm->user_hash, &kv, 1))
+ clib_warning ("user key add failed");
+ }
+ else
+ {
+ u = pool_elt_at_index (tsm->users, value.value);
+ }
+
+ /* Create a new session */
+ pool_get (tsm->sessions, s);
+ memset (s, 0, sizeof (*s));
+
+ s->ext_host_addr.as_u32 = ip->src_address.as_u32;
+ s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
+ s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
+ s->outside_address_index = ~0;
+ s->out2in = e_key;
+ s->in2out = l_key;
+ u->nstaticsessions++;
+
+ /* Create list elts */
+ pool_get (tsm->list_pool, elt);
+ clib_dlist_init (tsm->list_pool, elt - tsm->list_pool);
+ elt->value = s - tsm->sessions;
+ s->per_user_index = elt - tsm->list_pool;
+ s->per_user_list_head_index = u->sessions_per_user_list_head_index;
+ clib_dlist_addtail (tsm->list_pool, s->per_user_list_head_index,
+ s->per_user_index);
+
+ /* Add to lookup tables */
+ s_kv.value = s - tsm->sessions;
+ if (clib_bihash_add_del_16_8 (&sm->out2in_ed, &s_kv, 1))
+ clib_warning ("out2in-ed key add failed");
+
+ key.l_addr = l_key.addr;
+ key.fib_index = l_key.fib_index;
+ key.l_port = l_key.port;
+ s_kv.key[0] = key.as_u64[0];
+ s_kv.key[1] = key.as_u64[1];
+ if (clib_bihash_add_del_16_8 (&sm->in2out_ed, &s_kv, 1))
+ clib_warning ("in2out-ed key add failed");
+ }
+
+ new_addr = ip->dst_address.as_u32 = s->in2out.addr.as_u32;
+
+ /* Update IP checksum */
+ sum = ip->checksum;
+ sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
+ ip->checksum = ip_csum_fold (sum);
+
+ if (PREDICT_TRUE(proto == SNAT_PROTOCOL_TCP))
+ {
+ old_port = tcp->dst_port;
+ tcp->dst_port = s->in2out.port;
+ new_port = tcp->dst_port;
+
+ sum = tcp->checksum;
+ sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
+ sum = ip_csum_update (sum, old_port, new_port, ip4_header_t, length);
+ tcp->checksum = ip_csum_fold(sum);
+ }
+ else
+ {
+ udp->dst_port = s->in2out.port;
+ udp->checksum = 0;
+ }
+
+ vnet_buffer(b)->sw_if_index[VLIB_TX] = s->in2out.fib_index;
+
+ /* Accounting */
+ s->last_heard = now;
+ s->total_pkts++;
+ s->total_bytes += vlib_buffer_length_in_chain (vm, b);
+}
+
static uword
snat_out2in_node_fn (vlib_main_t * vm,
vlib_node_runtime_t * node,
@@ -894,8 +1041,20 @@ snat_out2in_node_fn (vlib_main_t * vm,
}
}
else
- s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
- value0.value);
+ {
+ if (PREDICT_FALSE (value0.value == ~0ULL))
+ {
+ snat_out2in_lb(sm, b0, ip0, rx_fib_index0, thread_index, now,
+ vm);
+ goto trace0;
+ }
+ else
+ {
+ s0 = pool_elt_at_index (
+ sm->per_thread_data[thread_index].sessions,
+ value0.value);
+ }
+ }
old_addr0 = ip0->dst_address.as_u32;
ip0->dst_address = s0->in2out.addr;
@@ -1033,8 +1192,20 @@ snat_out2in_node_fn (vlib_main_t * vm,
}
}
else
- s1 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
- value1.value);
+ {
+ if (PREDICT_FALSE (value1.value == ~0ULL))
+ {
+ snat_out2in_lb(sm, b1, ip1, rx_fib_index1, thread_index, now,
+ vm);
+ goto trace1;
+ }
+ else
+ {
+ s1 = pool_elt_at_index (
+ sm->per_thread_data[thread_index].sessions,
+ value1.value);
+ }
+ }
old_addr1 = ip1->dst_address.as_u32;
ip1->dst_address = s1->in2out.addr;
@@ -1209,8 +1380,20 @@ snat_out2in_node_fn (vlib_main_t * vm,
}
}
else
- s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
- value0.value);
+ {
+ if (PREDICT_FALSE (value0.value == ~0ULL))
+ {
+ snat_out2in_lb(sm, b0, ip0, rx_fib_index0, thread_index, now,
+ vm);
+ goto trace00;
+ }
+ else
+ {
+ s0 = pool_elt_at_index (
+ sm->per_thread_data[thread_index].sessions,
+ value0.value);
+ }
+ }
old_addr0 = ip0->dst_address.as_u32;
ip0->dst_address = s0->in2out.addr;