#include <nat/nat.h>
#include <nat/nat_ipfix_logging.h>
#include <nat/nat_det.h>
+#include <nat/nat_reass.h>
#include <vppinfra/hash.h>
#include <vppinfra/error.h>
return s;
}
+typedef struct {
+ u32 sw_if_index;
+ u32 next_index;
+ u8 cached;
+} nat44_out2in_reass_trace_t;
+
+static u8 * format_nat44_out2in_reass_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ nat44_out2in_reass_trace_t * t = va_arg (*args, nat44_out2in_reass_trace_t *);
+
+ s = format (s, "NAT44_OUT2IN_REASS: sw_if_index %d, next index %d, status %s",
+ t->sw_if_index, t->next_index,
+ t->cached ? "cached" : "translated");
+
+ return s;
+}
+
vlib_node_registration_t snat_out2in_node;
vlib_node_registration_t snat_out2in_fast_node;
vlib_node_registration_t snat_out2in_worker_handoff_node;
vlib_node_registration_t snat_det_out2in_node;
+vlib_node_registration_t nat44_out2in_reass_node;
#define foreach_snat_out2in_error \
_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
_(OUT2IN_PACKETS, "Good out2in packets processed") \
+_(OUT_OF_PORTS, "Out of ports") \
_(BAD_ICMP_TYPE, "unsupported ICMP type") \
_(NO_TRANSLATION, "No translation") \
-_(MAX_SESSIONS_EXCEEDED, "Maximum sessions exceeded")
+_(MAX_SESSIONS_EXCEEDED, "Maximum sessions exceeded") \
+_(DROP_FRAGMENT, "Drop fragment") \
+_(MAX_REASS, "Maximum reassemblies exceeded") \
+_(MAX_FRAG, "Maximum fragments per reassembly exceeded")
typedef enum {
#define _(sym,str) SNAT_OUT2IN_ERROR_##sym,
SNAT_OUT2IN_NEXT_DROP,
SNAT_OUT2IN_NEXT_LOOKUP,
SNAT_OUT2IN_NEXT_ICMP_ERROR,
+ SNAT_OUT2IN_NEXT_REASS,
+ SNAT_OUT2IN_NEXT_IN2OUT,
SNAT_OUT2IN_N_NEXT,
} snat_out2in_next_t;
u32 thread_index)
{
snat_user_t *u;
- snat_user_key_t user_key;
snat_session_t *s;
- clib_bihash_kv_8_8_t kv0, value0;
- dlist_elt_t * per_user_translation_list_elt;
- dlist_elt_t * per_user_list_head_elt;
+ clib_bihash_kv_8_8_t kv0;
ip4_header_t *ip0;
+ udp_header_t *udp0;
if (PREDICT_FALSE (maximum_sessions_exceeded(sm, thread_index)))
{
}
ip0 = vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
- user_key.addr = in2out.addr;
- user_key.fib_index = in2out.fib_index;
- kv0.key = user_key.as_u64;
-
- /* Ever heard of the "user" = inside ip4 address before? */
- if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].user_hash,
- &kv0, &value0))
+ u = nat_user_get_or_create (sm, &in2out.addr, in2out.fib_index, thread_index);
+ if (!u)
{
- /* no, make a new one */
- pool_get (sm->per_thread_data[thread_index].users, u);
- memset (u, 0, sizeof (*u));
- u->addr = in2out.addr;
- u->fib_index = in2out.fib_index;
-
- pool_get (sm->per_thread_data[thread_index].list_pool,
- per_user_list_head_elt);
-
- u->sessions_per_user_list_head_index = per_user_list_head_elt -
- sm->per_thread_data[thread_index].list_pool;
-
- clib_dlist_init (sm->per_thread_data[thread_index].list_pool,
- u->sessions_per_user_list_head_index);
-
- kv0.value = u - sm->per_thread_data[thread_index].users;
-
- /* add user */
- clib_bihash_add_del_8_8 (&sm->per_thread_data[thread_index].user_hash,
- &kv0, 1 /* is_add */);
+ clib_warning ("create NAT user failed");
+ return 0;
}
- else
+
+ s = nat_session_alloc_or_recycle (sm, u, thread_index);
+ if (!s)
{
- u = pool_elt_at_index (sm->per_thread_data[thread_index].users,
- value0.value);
+ clib_warning ("create NAT session failed");
+ return 0;
}
- pool_get (sm->per_thread_data[thread_index].sessions, s);
- memset (s, 0, sizeof (*s));
-
s->outside_address_index = ~0;
s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
- s->ext_host_addr.as_u32 = ip0->dst_address.as_u32;
+ s->ext_host_addr.as_u32 = ip0->src_address.as_u32;
+ s->ext_host_port = udp0->src_port;
u->nstaticsessions++;
-
- /* Create list elts */
- pool_get (sm->per_thread_data[thread_index].list_pool,
- per_user_translation_list_elt);
- clib_dlist_init (sm->per_thread_data[thread_index].list_pool,
- per_user_translation_list_elt -
- sm->per_thread_data[thread_index].list_pool);
-
- per_user_translation_list_elt->value =
- s - sm->per_thread_data[thread_index].sessions;
- s->per_user_index =
- per_user_translation_list_elt - sm->per_thread_data[thread_index].list_pool;
- s->per_user_list_head_index = u->sessions_per_user_list_head_index;
-
- clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
- s->per_user_list_head_index,
- per_user_translation_list_elt -
- sm->per_thread_data[thread_index].list_pool);
-
s->in2out = in2out;
s->out2in = out2in;
s->in2out.protocol = out2in.protocol;
clib_warning ("in2out key add failed");
kv0.key = s->out2in.as_u64;
- kv0.value = s - sm->per_thread_data[thread_index].sessions;
if (clib_bihash_add_del_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0,
1 /* is_add */))
return -1; /* success */
}
+static_always_inline int
+icmp_get_ed_key(ip4_header_t *ip0, nat_ed_ses_key_t *p_key0)
+{
+ icmp46_header_t *icmp0;
+ nat_ed_ses_key_t key0;
+ icmp_echo_header_t *echo0, *inner_echo0 = 0;
+ ip4_header_t *inner_ip0;
+ void *l4_header = 0;
+ icmp46_header_t *inner_icmp0;
+
+ icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
+ echo0 = (icmp_echo_header_t *)(icmp0+1);
+
+ if (!icmp_is_error_message (icmp0))
+ {
+ key0.proto = IP_PROTOCOL_ICMP;
+ key0.l_addr = ip0->dst_address;
+ key0.r_addr = ip0->src_address;
+ key0.l_port = key0.r_port = echo0->identifier;
+ }
+ else
+ {
+ inner_ip0 = (ip4_header_t *)(echo0+1);
+ l4_header = ip4_next_header (inner_ip0);
+ key0.proto = inner_ip0->protocol;
+ key0.l_addr = inner_ip0->src_address;
+ key0.r_addr = inner_ip0->dst_address;
+ switch (ip_proto_to_snat_proto (inner_ip0->protocol))
+ {
+ case SNAT_PROTOCOL_ICMP:
+ inner_icmp0 = (icmp46_header_t*)l4_header;
+ inner_echo0 = (icmp_echo_header_t *)(inner_icmp0+1);
+ key0.l_port = key0.r_port = inner_echo0->identifier;
+ break;
+ case SNAT_PROTOCOL_UDP:
+ case SNAT_PROTOCOL_TCP:
+ key0.l_port = ((tcp_udp_header_t*)l4_header)->src_port;
+ key0.r_port = ((tcp_udp_header_t*)l4_header)->dst_port;
+ break;
+ default:
+ return -1;
+ }
+ }
+ *p_key0 = key0;
+ return 0;
+}
+
+static int
+next_src_nat (snat_main_t * sm, ip4_header_t * ip, u32 proto, u16 src_port,
+ u32 thread_index)
+{
+ snat_session_key_t key;
+ clib_bihash_kv_8_8_t kv, value;
+
+ key.addr = ip->src_address;
+ key.port = src_port;
+ key.protocol = proto;
+ key.fib_index = sm->inside_fib_index;
+ kv.key = key.as_u64;
+
+ if (!clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].in2out, &kv,
+ &value))
+ return 1;
+
+ return 0;
+}
+
+static void
+create_bypass_for_fwd(snat_main_t * sm, ip4_header_t * ip)
+{
+ nat_ed_ses_key_t key;
+ clib_bihash_kv_16_8_t kv;
+ udp_header_t *udp;
+
+ if (ip->protocol == IP_PROTOCOL_ICMP)
+ {
+ if (icmp_get_ed_key (ip, &key))
+ return;
+ }
+ else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
+ {
+ udp = ip4_next_header(ip);
+ key.r_addr = ip->src_address;
+ key.l_addr = ip->dst_address;
+ key.proto = ip->protocol;
+ key.l_port = udp->dst_port;
+ key.r_port = udp->src_port;
+ }
+ else
+ {
+ key.r_addr = ip->src_address;
+ key.l_addr = ip->dst_address;
+ key.proto = ip->protocol;
+ key.l_port = key.r_port = 0;
+ }
+ key.fib_index = 0;
+ kv.key[0] = key.as_u64[0];
+ kv.key[1] = key.as_u64[1];
+ kv.value = ~0ULL;
+
+ if (clib_bihash_add_del_16_8 (&sm->in2out_ed, &kv, 1))
+ clib_warning ("in2out_ed key add failed");
+}
+
/**
* Get address and port values to be used for ICMP packet translation
* and create session if needed
{
/* Try to match static mapping by external address and port,
destination address and port in packet */
- if (snat_static_mapping_match(sm, key0, &sm0, 1, &is_addr_only))
+ if (snat_static_mapping_match(sm, key0, &sm0, 1, &is_addr_only, 0))
{
- /* Don't NAT packet aimed at the intfc address */
- if (PREDICT_FALSE(is_interface_addr(sm, node, sw_if_index0,
- ip0->dst_address.as_u32)))
+ if (!sm->forwarding_enabled)
+ {
+ /* Don't NAT packet aimed at the intfc address */
+ if (PREDICT_FALSE(is_interface_addr(sm, node, sw_if_index0,
+ ip0->dst_address.as_u32)))
+ {
+ dont_translate = 1;
+ goto out;
+ }
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto out;
+ }
+ else
{
dont_translate = 1;
+ if (next_src_nat(sm, ip0, key0.protocol, key0.port, thread_index))
+ {
+ next0 = SNAT_OUT2IN_NEXT_IN2OUT;
+ goto out;
+ }
+ create_bypass_for_fwd(sm, ip0);
goto out;
}
- b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
- next0 = SNAT_OUT2IN_NEXT_DROP;
- goto out;
}
if (PREDICT_FALSE(icmp0->type != ICMP4_echo_reply &&
goto out;
}
- s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
- value0.value);
+ if (PREDICT_FALSE (value0.value == ~0ULL))
+ {
+ nat_ed_ses_key_t key;
+ clib_bihash_kv_16_8_t s_kv, s_value;
+
+ key.as_u64[0] = 0;
+ key.as_u64[1] = 0;
+ if (icmp_get_ed_key (ip0, &key))
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto out;
+ }
+ key.fib_index = rx_fib_index0;
+ 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))
+ s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
+ s_value.value);
+ else
+ {
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto out;
+ }
+ }
+ else
+ s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
+ value0.value);
}
out:
}
key0.fib_index = rx_fib_index0;
- if (snat_static_mapping_match(sm, key0, &sm0, 1, &is_addr_only))
+ if (snat_static_mapping_match(sm, key0, &sm0, 1, &is_addr_only, 0))
{
/* Don't NAT packet aimed at the intfc address */
if (is_interface_addr(sm, node, sw_if_index0, ip0->dst_address.as_u32))
dst_address /* changed member */);
ip0->checksum = ip_csum_fold (sum0);
+ if (icmp0->checksum == 0)
+ icmp0->checksum = 0xffff;
+
if (!icmp_is_error_message (icmp0))
{
new_id0 = sm0.port;
s0->last_heard = now;
s0->total_pkts++;
s0->total_bytes += vlib_buffer_length_in_chain (sm->vlib_main, b0);
- /* Per-user LRU list maintenance for dynamic translation */
- if (!snat_is_session_static (s0))
- {
- clib_dlist_remove (sm->per_thread_data[thread_index].list_pool,
- s0->per_user_index);
- clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
- s0->per_user_list_head_index,
- s0->per_user_index);
- }
+ /* Per-user LRU list maintenance */
+ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_index);
+ clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_list_head_index,
+ s0->per_user_index);
}
return next0;
}
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;
snat_user_t *u;
- dlist_elt_t *head, *elt;
old_addr = ip->dst_address.as_u32;
key.r_addr = ip->src_address;
key.fib_index = rx_fib_index;
key.proto = ip->protocol;
- key.rsvd = 0;
+ key.r_port = 0;
key.l_port = 0;
s_kv.key[0] = key.as_u64[0];
s_kv.key[1] = key.as_u64[1];
new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32;
- u_key.addr = ip->src_address;
- u_key.fib_index = m->fib_index;
- kv.key = u_key.as_u64;
-
- /* Ever heard of the "user" = src ip4 address before? */
- if (clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
- {
- /* no, make a new one */
- pool_get (tsm->users, u);
- memset (u, 0, sizeof (*u));
- u->addr = ip->src_address;
- u->fib_index = rx_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 */
- clib_bihash_add_del_8_8 (&tsm->user_hash, &kv, 1);
- }
- else
+ u = nat_user_get_or_create (sm, &ip->src_address, m->fib_index,
+ thread_index);
+ if (!u)
{
- u = pool_elt_at_index (tsm->users, value.value);
+ clib_warning ("create NAT user failed");
+ return 0;
}
/* Create a new session */
- pool_get (tsm->sessions, s);
- memset (s, 0, sizeof (*s));
+ s = nat_session_alloc_or_recycle (sm, u, thread_index);
+ if (!s)
+ {
+ clib_warning ("create NAT session failed");
+ return 0;
+ }
s->ext_host_addr.as_u32 = ip->src_address.as_u32;
s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
s->in2out.port = s->out2in.port = ip->protocol;
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))
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;
+ u32 address_index;
+ snat_session_key_t eh_key;
+ u8 twice_nat;
old_addr = ip->dst_address.as_u32;
key.r_addr = ip->src_address;
key.fib_index = rx_fib_index;
key.proto = ip->protocol;
- key.rsvd = 0;
+ key.r_port = udp->src_port;
key.l_port = udp->dst_port;
s_kv.key[0] = key.as_u64[0];
s_kv.key[1] = key.as_u64[1];
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))
+ if (snat_static_mapping_match(sm, e_key, &l_key, 1, 0, &twice_nat))
return 0;
- 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 (&tsm->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;
+ u = nat_user_get_or_create (sm, &l_key.addr, l_key.fib_index,
+ thread_index);
+ if (!u)
+ {
+ clib_warning ("create NAT user failed");
+ return 0;
+ }
- /* add user */
- if (clib_bihash_add_del_8_8 (&tsm->user_hash, &kv, 1))
- clib_warning ("user key add failed");
- }
- else
+ s = nat_session_alloc_or_recycle (sm, u, thread_index);
+ if (!s)
{
- u = pool_elt_at_index (tsm->users, value.value);
+ clib_warning ("create NAT session failed");
+ return 0;
}
- /* 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->ext_host_port = udp->src_port;
s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
s->outside_address_index = ~0;
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");
+ if (twice_nat)
+ {
+ eh_key.protocol = proto;
+ if (snat_alloc_outside_address_and_port (sm->twice_nat_addresses, 0,
+ thread_index, &eh_key,
+ &address_index,
+ sm->port_per_thread,
+ sm->per_thread_data[thread_index].snat_thread_index))
+ {
+ b->error = node->errors[SNAT_OUT2IN_ERROR_OUT_OF_PORTS];
+ return 0;
+ }
+ key.r_addr.as_u32 = s->ext_host_nat_addr.as_u32 = eh_key.addr.as_u32;
+ key.r_port = s->ext_host_nat_port = eh_key.port;
+ s->flags |= SNAT_SESSION_FLAG_TWICE_NAT;
+ }
key.l_addr = l_key.addr;
key.fib_index = l_key.fib_index;
key.l_port = l_key.port;
/* Update IP checksum */
sum = ip->checksum;
sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
+ if (is_twice_nat_session (s))
+ sum = ip_csum_update (sum, ip->src_address.as_u32,
+ s->ext_host_nat_addr.as_u32, ip4_header_t,
+ src_address);
ip->checksum = ip_csum_fold (sum);
if (PREDICT_TRUE(proto == SNAT_PROTOCOL_TCP))
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);
+ if (is_twice_nat_session (s))
+ {
+ sum = ip_csum_update (sum, ip->src_address.as_u32,
+ s->ext_host_nat_addr.as_u32, ip4_header_t,
+ dst_address);
+ sum = ip_csum_update (sum, tcp->src_port, s->ext_host_nat_port,
+ ip4_header_t, length);
+ tcp->src_port = s->ext_host_nat_port;
+ ip->src_address.as_u32 = s->ext_host_nat_addr.as_u32;
+ }
tcp->checksum = ip_csum_fold(sum);
}
else
{
udp->dst_port = s->in2out.port;
+ if (is_twice_nat_session (s))
+ {
+ udp->src_port = s->ext_host_nat_port;
+ ip->src_address.as_u32 = s->ext_host_nat_addr.as_u32;
+ }
udp->checksum = 0;
}
s->last_heard = now;
s->total_pkts++;
s->total_bytes += vlib_buffer_length_in_chain (vm, b);
+ /* Per-user LRU list maintenance */
+ clib_dlist_remove (tsm->list_pool, s->per_user_index);
+ clib_dlist_addtail (tsm->list_pool, s->per_user_list_head_index,
+ s->per_user_index);
+
return s;
}
{
s0 = snat_out2in_unknown_proto(sm, b0, ip0, rx_fib_index0,
thread_index, now, vm, node);
- if (!s0)
- next0 = SNAT_OUT2IN_NEXT_DROP;
+ if (!sm->forwarding_enabled)
+ if (!s0)
+ next0 = SNAT_OUT2IN_NEXT_DROP;
goto trace0;
}
goto trace0;
}
+ if (PREDICT_FALSE (ip4_is_fragment (ip0)))
+ {
+ next0 = SNAT_OUT2IN_NEXT_REASS;
+ goto trace0;
+ }
+
key0.addr = ip0->dst_address;
key0.port = udp0->dst_port;
key0.protocol = proto0;
{
/* Try to match static mapping by external address and port,
destination address and port in packet */
- if (snat_static_mapping_match(sm, key0, &sm0, 1, 0))
+ if (snat_static_mapping_match(sm, key0, &sm0, 1, 0, 0))
{
- b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
- /*
- * Send DHCP packets to the ipv4 stack, or we won't
- * be able to use dhcp client on the outside interface
- */
- if (proto0 != SNAT_PROTOCOL_UDP
- || (udp0->dst_port
- != clib_host_to_net_u16(UDP_DST_PORT_dhcp_to_client)))
- next0 = SNAT_OUT2IN_NEXT_DROP;
- goto trace0;
+ if (!sm->forwarding_enabled)
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ /*
+ * Send DHCP packets to the ipv4 stack, or we won't
+ * be able to use dhcp client on the outside interface
+ */
+ if (PREDICT_TRUE (proto0 != SNAT_PROTOCOL_UDP
+ || (udp0->dst_port
+ != clib_host_to_net_u16(UDP_DST_PORT_dhcp_to_client))))
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ else
+ vnet_feature_next
+ (vnet_buffer (b0)->sw_if_index[VLIB_RX],
+ &next0, b0);
+ goto trace0;
+ }
+ else
+ {
+ if (next_src_nat(sm, ip0, proto0, udp0->src_port, thread_index))
+ {
+ next0 = SNAT_OUT2IN_NEXT_IN2OUT;
+ goto trace0;
+ }
+ create_bypass_for_fwd(sm, ip0);
+ goto trace0;
+ }
}
/* Create session initiated by host from external network */
s0->last_heard = now;
s0->total_pkts++;
s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
- /* Per-user LRU list maintenance for dynamic translation */
- if (!snat_is_session_static (s0))
- {
- clib_dlist_remove (sm->per_thread_data[thread_index].list_pool,
- s0->per_user_index);
- clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
- s0->per_user_list_head_index,
- s0->per_user_index);
- }
+ /* Per-user LRU list maintenance */
+ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_index);
+ clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_list_head_index,
+ s0->per_user_index);
trace0:
if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
{
s1 = snat_out2in_unknown_proto(sm, b1, ip1, rx_fib_index1,
thread_index, now, vm, node);
- if (!s1)
- next1 = SNAT_OUT2IN_NEXT_DROP;
+ if (!sm->forwarding_enabled)
+ if (!s1)
+ next1 = SNAT_OUT2IN_NEXT_DROP;
goto trace1;
}
goto trace1;
}
+ if (PREDICT_FALSE (ip4_is_fragment (ip1)))
+ {
+ next1 = SNAT_OUT2IN_NEXT_REASS;
+ goto trace1;
+ }
+
key1.addr = ip1->dst_address;
key1.port = udp1->dst_port;
key1.protocol = proto1;
{
/* Try to match static mapping by external address and port,
destination address and port in packet */
- if (snat_static_mapping_match(sm, key1, &sm1, 1, 0))
+ if (snat_static_mapping_match(sm, key1, &sm1, 1, 0, 0))
{
- b1->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
- /*
- * Send DHCP packets to the ipv4 stack, or we won't
- * be able to use dhcp client on the outside interface
- */
- if (proto1 != SNAT_PROTOCOL_UDP
- || (udp1->dst_port
- != clib_host_to_net_u16(UDP_DST_PORT_dhcp_to_client)))
- next1 = SNAT_OUT2IN_NEXT_DROP;
- goto trace1;
+ if (!sm->forwarding_enabled)
+ {
+ b1->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ /*
+ * Send DHCP packets to the ipv4 stack, or we won't
+ * be able to use dhcp client on the outside interface
+ */
+ if (PREDICT_TRUE (proto1 != SNAT_PROTOCOL_UDP
+ || (udp1->dst_port
+ != clib_host_to_net_u16(UDP_DST_PORT_dhcp_to_client))))
+ next1 = SNAT_OUT2IN_NEXT_DROP;
+ else
+ vnet_feature_next
+ (vnet_buffer (b1)->sw_if_index[VLIB_RX],
+ &next1, b1);
+ goto trace1;
+ }
+ else
+ {
+ if (next_src_nat(sm, ip1, proto1, udp1->src_port, thread_index))
+ {
+ next1 = SNAT_OUT2IN_NEXT_IN2OUT;
+ goto trace1;
+ }
+ create_bypass_for_fwd(sm, ip1);
+ goto trace1;
+ }
}
/* Create session initiated by host from external network */
s1->last_heard = now;
s1->total_pkts++;
s1->total_bytes += vlib_buffer_length_in_chain (vm, b1);
- /* Per-user LRU list maintenance for dynamic translation */
- if (!snat_is_session_static (s1))
- {
- clib_dlist_remove (sm->per_thread_data[thread_index].list_pool,
- s1->per_user_index);
- clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
- s1->per_user_list_head_index,
- s1->per_user_index);
- }
+ /* Per-user LRU list maintenance */
+ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool,
+ s1->per_user_index);
+ clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
+ s1->per_user_list_head_index,
+ s1->per_user_index);
trace1:
if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
{
s0 = snat_out2in_unknown_proto(sm, b0, ip0, rx_fib_index0,
thread_index, now, vm, node);
- if (!s0)
- next0 = SNAT_OUT2IN_NEXT_DROP;
+ if (!sm->forwarding_enabled)
+ if (!s0)
+ next0 = SNAT_OUT2IN_NEXT_DROP;
goto trace00;
}
goto trace00;
}
+ if (PREDICT_FALSE (ip4_is_fragment (ip0)))
+ {
+ next0 = SNAT_OUT2IN_NEXT_REASS;
+ goto trace00;
+ }
+
key0.addr = ip0->dst_address;
key0.port = udp0->dst_port;
key0.protocol = proto0;
{
/* Try to match static mapping by external address and port,
destination address and port in packet */
- if (snat_static_mapping_match(sm, key0, &sm0, 1, 0))
+ if (snat_static_mapping_match(sm, key0, &sm0, 1, 0, 0))
{
- b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
- /*
- * Send DHCP packets to the ipv4 stack, or we won't
- * be able to use dhcp client on the outside interface
- */
- if (proto0 != SNAT_PROTOCOL_UDP
- || (udp0->dst_port
- != clib_host_to_net_u16(UDP_DST_PORT_dhcp_to_client)))
-
- next0 = SNAT_OUT2IN_NEXT_DROP;
- goto trace00;
+ if (!sm->forwarding_enabled)
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ /*
+ * Send DHCP packets to the ipv4 stack, or we won't
+ * be able to use dhcp client on the outside interface
+ */
+ if (PREDICT_TRUE (proto0 != SNAT_PROTOCOL_UDP
+ || (udp0->dst_port
+ != clib_host_to_net_u16(UDP_DST_PORT_dhcp_to_client))))
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ else
+ vnet_feature_next
+ (vnet_buffer (b0)->sw_if_index[VLIB_RX],
+ &next0, b0);
+ goto trace00;
+ }
+ else
+ {
+ if (next_src_nat(sm, ip0, proto0, udp0->src_port, thread_index))
+ {
+ next0 = SNAT_OUT2IN_NEXT_IN2OUT;
+ goto trace00;
+ }
+ create_bypass_for_fwd(sm, ip0);
+ goto trace00;
+ }
}
/* Create session initiated by host from external network */
s0->last_heard = now;
s0->total_pkts++;
s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
- /* Per-user LRU list maintenance for dynamic translation */
- if (!snat_is_session_static (s0))
- {
- clib_dlist_remove (sm->per_thread_data[thread_index].list_pool,
- s0->per_user_index);
- clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
- s0->per_user_list_head_index,
- s0->per_user_index);
- }
+ /* Per-user LRU list maintenance */
+ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_index);
+ clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_list_head_index,
+ s0->per_user_index);
trace00:
if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
[SNAT_OUT2IN_NEXT_DROP] = "error-drop",
[SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
[SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",
+ [SNAT_OUT2IN_NEXT_IN2OUT] = "nat44-in2out",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_node, snat_out2in_node_fn);
+static uword
+nat44_out2in_reass_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, *from, *to_next;
+ snat_out2in_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t *sm = &snat_main;
+ f64 now = vlib_time_now (vm);
+ u32 thread_index = vlib_get_thread_index ();
+ snat_main_per_thread_data_t *per_thread_data =
+ &sm->per_thread_data[thread_index];
+ u32 *fragments_to_drop = 0;
+ u32 *fragments_to_loopback = 0;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0;
+ vlib_buffer_t *b0;
+ u32 next0;
+ u8 cached0 = 0;
+ ip4_header_t *ip0;
+ nat_reass_ip4_t *reass0;
+ udp_header_t * udp0;
+ tcp_header_t * tcp0;
+ snat_session_key_t key0, sm0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ snat_session_t * s0 = 0;
+ u16 old_port0, new_port0;
+ ip_csum_t sum0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ next0 = SNAT_OUT2IN_NEXT_LOOKUP;
+
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+ rx_fib_index0 = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
+ sw_if_index0);
+
+ if (PREDICT_FALSE (nat_reass_is_drop_frag(0)))
+ {
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT];
+ goto trace0;
+ }
+
+ ip0 = (ip4_header_t *) vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+ proto0 = ip_proto_to_snat_proto (ip0->protocol);
+
+ reass0 = nat_ip4_reass_find_or_create (ip0->src_address,
+ ip0->dst_address,
+ ip0->fragment_id,
+ ip0->protocol,
+ 1,
+ &fragments_to_drop);
+
+ if (PREDICT_FALSE (!reass0))
+ {
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_REASS];
+ goto trace0;
+ }
+
+ if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
+ {
+ key0.addr = ip0->dst_address;
+ key0.port = udp0->dst_port;
+ key0.protocol = proto0;
+ key0.fib_index = rx_fib_index0;
+ kv0.key = key0.as_u64;
+
+ if (clib_bihash_search_8_8 (&per_thread_data->out2in, &kv0, &value0))
+ {
+ /* Try to match static mapping by external address and port,
+ destination address and port in packet */
+ if (snat_static_mapping_match(sm, key0, &sm0, 1, 0, 0))
+ {
+ if (!sm->forwarding_enabled)
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ /*
+ * Send DHCP packets to the ipv4 stack, or we won't
+ * be able to use dhcp client on the outside interface
+ */
+ if (PREDICT_TRUE (proto0 != SNAT_PROTOCOL_UDP
+ || (udp0->dst_port
+ != clib_host_to_net_u16(UDP_DST_PORT_dhcp_to_client))))
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ else
+ vnet_feature_next
+ (vnet_buffer (b0)->sw_if_index[VLIB_RX],
+ &next0, b0);
+ goto trace0;
+ }
+ else
+ {
+ if (next_src_nat(sm, ip0, proto0, udp0->src_port, thread_index))
+ {
+ next0 = SNAT_OUT2IN_NEXT_IN2OUT;
+ goto trace0;
+ }
+ create_bypass_for_fwd(sm, ip0);
+ goto trace0;
+ }
+ }
+
+ /* Create session initiated by host from external network */
+ s0 = create_session_for_static_mapping(sm, b0, sm0, key0, node,
+ thread_index);
+ if (!s0)
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto trace0;
+ }
+ reass0->sess_index = s0 - per_thread_data->sessions;
+ reass0->thread_index = thread_index;
+ }
+ else
+ {
+ s0 = pool_elt_at_index (per_thread_data->sessions,
+ value0.value);
+ reass0->sess_index = value0.value;
+ }
+ nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
+ }
+ else
+ {
+ if (PREDICT_FALSE (reass0->sess_index == (u32) ~0))
+ {
+ if (nat_ip4_reass_add_fragment (reass0, bi0))
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_FRAG];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto trace0;
+ }
+ cached0 = 1;
+ goto trace0;
+ }
+ s0 = pool_elt_at_index (per_thread_data->sessions,
+ reass0->sess_index);
+ }
+
+ old_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address = s0->in2out.addr;
+ new_addr0 = ip0->dst_address.as_u32;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
+ {
+ if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
+ {
+ old_port0 = tcp0->dst_port;
+ tcp0->dst_port = s0->in2out.port;
+ new_port0 = tcp0->dst_port;
+
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */);
+
+ sum0 = ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */,
+ length /* changed member */);
+ tcp0->checksum = ip_csum_fold(sum0);
+ }
+ else
+ {
+ old_port0 = udp0->dst_port;
+ udp0->dst_port = s0->in2out.port;
+ udp0->checksum = 0;
+ }
+ }
+
+ /* Accounting */
+ s0->last_heard = now;
+ s0->total_pkts++;
+ s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
+ /* Per-user LRU list maintenance */
+ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_index);
+ clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_list_head_index,
+ s0->per_user_index);
+
+ trace0:
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ nat44_out2in_reass_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->cached = cached0;
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ }
+
+ if (cached0)
+ {
+ n_left_to_next++;
+ to_next--;
+ }
+ else
+ {
+ pkts_processed += next0 != SNAT_OUT2IN_NEXT_DROP;
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ if (n_left_from == 0 && vec_len (fragments_to_loopback))
+ {
+ from = vlib_frame_vector_args (frame);
+ u32 len = vec_len (fragments_to_loopback);
+ if (len <= VLIB_FRAME_SIZE)
+ {
+ clib_memcpy (from, fragments_to_loopback, sizeof (u32) * len);
+ n_left_from = len;
+ vec_reset_length (fragments_to_loopback);
+ }
+ else
+ {
+ clib_memcpy (from,
+ fragments_to_loopback + (len - VLIB_FRAME_SIZE),
+ sizeof (u32) * VLIB_FRAME_SIZE);
+ n_left_from = VLIB_FRAME_SIZE;
+ _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
+ }
+ }
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, nat44_out2in_reass_node.index,
+ SNAT_OUT2IN_ERROR_OUT2IN_PACKETS,
+ pkts_processed);
+
+ nat_send_all_to_node (vm, fragments_to_drop, node,
+ &node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT],
+ SNAT_OUT2IN_NEXT_DROP);
+
+ vec_free (fragments_to_drop);
+ vec_free (fragments_to_loopback);
+ return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (nat44_out2in_reass_node) = {
+ .function = nat44_out2in_reass_node_fn,
+ .name = "nat44-out2in-reass",
+ .vector_size = sizeof (u32),
+ .format_trace = format_nat44_out2in_reass_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(snat_out2in_error_strings),
+ .error_strings = snat_out2in_error_strings,
+
+ .n_next_nodes = SNAT_OUT2IN_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [SNAT_OUT2IN_NEXT_DROP] = "error-drop",
+ [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
+ [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",
+ [SNAT_OUT2IN_NEXT_IN2OUT] = "nat44-in2out",
+ },
+};
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_out2in_reass_node,
+ nat44_out2in_reass_node_fn);
+
/**************************/
/*** deterministic mode ***/
/**************************/
[SNAT_OUT2IN_NEXT_DROP] = "error-drop",
[SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
[SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",
+ [SNAT_OUT2IN_NEXT_IN2OUT] = "nat44-in2out",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (snat_det_out2in_node, snat_det_out2in_node_fn);
key0.port = udp0->dst_port;
key0.fib_index = rx_fib_index0;
- if (snat_static_mapping_match(sm, key0, &sm0, 1, 0))
+ if (snat_static_mapping_match(sm, key0, &sm0, 1, 0, 0))
{
b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
goto trace00;
[SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
[SNAT_OUT2IN_NEXT_DROP] = "error-drop",
[SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",
+ [SNAT_OUT2IN_NEXT_IN2OUT] = "nat44-in2out",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_fast_node, snat_out2in_fast_node_fn);
Code Review / vpp.git / blobdiff