#include <vnet/ip/ip_frag.h>
#include <vnet/ip/ip4_to_ip6.h>
-#define IP4_MAP_T_DUAL_LOOP 1
-
typedef enum
{
IP4_MAPT_NEXT_MAPT_TCP_UDP,
return frame->n_vectors;
}
-static int
-ip4_to_ip6_set_cb (ip4_header_t * ip4, ip6_header_t * ip6, void *ctx)
+/*
+ * Translate fragmented IPv4 UDP/TCP packet to IPv6.
+ */
+always_inline int
+map_ip4_to_ip6_fragmented (vlib_buffer_t * p,
+ ip4_mapt_pseudo_header_t * pheader)
{
- ip4_mapt_pseudo_header_t *pheader = ctx;
+ ip4_header_t *ip4;
+ ip6_header_t *ip6;
+ ip6_frag_hdr_t *frag;
+
+ ip4 = vlib_buffer_get_current (p);
+ frag = (ip6_frag_hdr_t *) u8_ptr_add (ip4, sizeof (*ip4) - sizeof (*frag));
+ ip6 =
+ (ip6_header_t *) u8_ptr_add (ip4,
+ sizeof (*ip4) - sizeof (*frag) -
+ sizeof (*ip6));
+ vlib_buffer_advance (p, sizeof (*ip4) - sizeof (*ip6) - sizeof (*frag));
+
+ //We know that the protocol was one of ICMP, TCP or UDP
+ //because the first fragment was found and cached
+ frag->next_hdr =
+ (ip4->protocol == IP_PROTOCOL_ICMP) ? IP_PROTOCOL_ICMP6 : ip4->protocol;
+ frag->identification = frag_id_4to6 (ip4->fragment_id);
+ frag->rsv = 0;
+ frag->fragment_offset_and_more =
+ ip6_frag_hdr_offset_and_more (ip4_get_fragment_offset (ip4),
+ clib_net_to_host_u16
+ (ip4->flags_and_fragment_offset) &
+ IP4_HEADER_FLAG_MORE_FRAGMENTS);
+
+ ip6->ip_version_traffic_class_and_flow_label =
+ clib_host_to_net_u32 ((6 << 28) + (ip4->tos << 20));
+ ip6->payload_length =
+ clib_host_to_net_u16 (clib_net_to_host_u16 (ip4->length) -
+ sizeof (*ip4) + sizeof (*frag));
+ ip6->hop_limit = ip4->ttl;
+ ip6->protocol = IP_PROTOCOL_IPV6_FRAGMENTATION;
ip6->dst_address.as_u64[0] = pheader->daddr.as_u64[0];
ip6->dst_address.as_u64[1] = pheader->daddr.as_u64[1];
pheader0 = vlib_buffer_get_current (p0);
vlib_buffer_advance (p0, sizeof (*pheader0));
- if (ip4_to_ip6_fragmented (p0, ip4_to_ip6_set_cb, pheader0))
+ if (map_ip4_to_ip6_fragmented (p0, pheader0))
{
p0->error = error_node->errors[MAP_ERROR_FRAGMENT_DROPPED];
next0 = IP4_MAPT_FRAGMENTED_NEXT_DROP;
return frame->n_vectors;
}
+/*
+ * Translate IPv4 UDP/TCP packet to IPv6.
+ */
+always_inline int
+map_ip4_to_ip6_tcp_udp (vlib_buffer_t * p, ip4_mapt_pseudo_header_t * pheader)
+{
+ map_main_t *mm = &map_main;
+ ip4_header_t *ip4;
+ ip6_header_t *ip6;
+ ip_csum_t csum;
+ u16 *checksum;
+ ip6_frag_hdr_t *frag;
+ u32 frag_id;
+ ip4_address_t old_src, old_dst;
+
+ ip4 = vlib_buffer_get_current (p);
+
+ if (ip4->protocol == IP_PROTOCOL_UDP)
+ {
+ udp_header_t *udp = ip4_next_header (ip4);
+ checksum = &udp->checksum;
+
+ /*
+ * UDP checksum is optional over IPv4 but mandatory for IPv6 We
+ * do not check udp->length sanity but use our safe computed
+ * value instead
+ */
+ if (PREDICT_FALSE (!*checksum))
+ {
+ u16 udp_len = clib_host_to_net_u16 (ip4->length) - sizeof (*ip4);
+ csum = ip_incremental_checksum (0, udp, udp_len);
+ csum = ip_csum_with_carry (csum, clib_host_to_net_u16 (udp_len));
+ csum =
+ ip_csum_with_carry (csum, clib_host_to_net_u16 (IP_PROTOCOL_UDP));
+ csum = ip_csum_with_carry (csum, *((u64 *) (&ip4->src_address)));
+ *checksum = ~ip_csum_fold (csum);
+ }
+ }
+ else
+ {
+ tcp_header_t *tcp = ip4_next_header (ip4);
+ if (mm->tcp_mss > 0)
+ {
+ csum = tcp->checksum;
+ map_mss_clamping (tcp, &csum, mm->tcp_mss);
+ tcp->checksum = ip_csum_fold (csum);
+ }
+ checksum = &tcp->checksum;
+ }
+
+ old_src.as_u32 = ip4->src_address.as_u32;
+ old_dst.as_u32 = ip4->dst_address.as_u32;
+
+ /* Deal with fragmented packets */
+ if (PREDICT_FALSE (ip4->flags_and_fragment_offset &
+ clib_host_to_net_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS)))
+ {
+ ip6 =
+ (ip6_header_t *) u8_ptr_add (ip4,
+ sizeof (*ip4) - sizeof (*ip6) -
+ sizeof (*frag));
+ frag =
+ (ip6_frag_hdr_t *) u8_ptr_add (ip4, sizeof (*ip4) - sizeof (*frag));
+ frag_id = frag_id_4to6 (ip4->fragment_id);
+ vlib_buffer_advance (p, sizeof (*ip4) - sizeof (*ip6) - sizeof (*frag));
+ }
+ else
+ {
+ ip6 = (ip6_header_t *) (((u8 *) ip4) + sizeof (*ip4) - sizeof (*ip6));
+ vlib_buffer_advance (p, sizeof (*ip4) - sizeof (*ip6));
+ frag = NULL;
+ }
+
+ ip6->ip_version_traffic_class_and_flow_label =
+ clib_host_to_net_u32 ((6 << 28) + (ip4->tos << 20));
+ ip6->payload_length = u16_net_add (ip4->length, -sizeof (*ip4));
+ ip6->hop_limit = ip4->ttl;
+ ip6->protocol = ip4->protocol;
+ if (PREDICT_FALSE (frag != NULL))
+ {
+ frag->next_hdr = ip6->protocol;
+ frag->identification = frag_id;
+ frag->rsv = 0;
+ frag->fragment_offset_and_more = ip6_frag_hdr_offset_and_more (0, 1);
+ ip6->protocol = IP_PROTOCOL_IPV6_FRAGMENTATION;
+ ip6->payload_length = u16_net_add (ip6->payload_length, sizeof (*frag));
+ }
+
+ ip6->dst_address.as_u64[0] = pheader->daddr.as_u64[0];
+ ip6->dst_address.as_u64[1] = pheader->daddr.as_u64[1];
+ ip6->src_address.as_u64[0] = pheader->saddr.as_u64[0];
+ ip6->src_address.as_u64[1] = pheader->saddr.as_u64[1];
+
+ csum = ip_csum_sub_even (*checksum, old_src.as_u32);
+ csum = ip_csum_sub_even (csum, old_dst.as_u32);
+ csum = ip_csum_add_even (csum, ip6->src_address.as_u64[0]);
+ csum = ip_csum_add_even (csum, ip6->src_address.as_u64[1]);
+ csum = ip_csum_add_even (csum, ip6->dst_address.as_u64[0]);
+ csum = ip_csum_add_even (csum, ip6->dst_address.as_u64[1]);
+ *checksum = ip_csum_fold (csum);
+
+ return 0;
+}
+
static uword
ip4_map_t_tcp_udp (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
-#ifdef IP4_MAP_T_DUAL_LOOP
- while (n_left_from >= 4 && n_left_to_next >= 2)
- {
- u32 pi0, pi1;
- vlib_buffer_t *p0, *p1;
- ip4_mapt_pseudo_header_t *pheader0, *pheader1;
- ip4_mapt_tcp_udp_next_t next0, next1;
-
- pi0 = to_next[0] = from[0];
- pi1 = to_next[1] = from[1];
- from += 2;
- n_left_from -= 2;
- to_next += 2;
- n_left_to_next -= 2;
-
- next0 = IP4_MAPT_TCP_UDP_NEXT_IP6_LOOKUP;
- next1 = IP4_MAPT_TCP_UDP_NEXT_IP6_LOOKUP;
- p0 = vlib_get_buffer (vm, pi0);
- p1 = vlib_get_buffer (vm, pi1);
-
- //Accessing pseudo header
- pheader0 = vlib_buffer_get_current (p0);
- pheader1 = vlib_buffer_get_current (p1);
- vlib_buffer_advance (p0, sizeof (*pheader0));
- vlib_buffer_advance (p1, sizeof (*pheader1));
-
- if (ip4_to_ip6_tcp_udp (p0, ip4_to_ip6_set_cb, pheader0))
- {
- p0->error = error_node->errors[MAP_ERROR_UNKNOWN];
- next0 = IP4_MAPT_TCP_UDP_NEXT_DROP;
- }
- else
- {
- if (vnet_buffer (p0)->map_t.mtu < p0->current_length)
- {
- //Send to fragmentation node if necessary
- vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
- vnet_buffer (p0)->ip_frag.next_index =
- IP6_FRAG_NEXT_IP6_LOOKUP;
- next0 = IP4_MAPT_TCP_UDP_NEXT_IP6_FRAG;
- }
- }
-
- if (ip4_to_ip6_tcp_udp (p1, ip4_to_ip6_set_cb, pheader1))
- {
- p1->error = error_node->errors[MAP_ERROR_UNKNOWN];
- next1 = IP4_MAPT_TCP_UDP_NEXT_DROP;
- }
- else
- {
- if (vnet_buffer (p1)->map_t.mtu < p1->current_length)
- {
- //Send to fragmentation node if necessary
- vnet_buffer (p1)->ip_frag.mtu = vnet_buffer (p1)->map_t.mtu;
- vnet_buffer (p1)->ip_frag.next_index =
- IP6_FRAG_NEXT_IP6_LOOKUP;
- next1 = IP4_MAPT_TCP_UDP_NEXT_IP6_FRAG;
- }
- }
-
- vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
- to_next, n_left_to_next, pi0, pi1,
- next0, next1);
- }
-#endif
-
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 pi0;
pheader0 = vlib_buffer_get_current (p0);
vlib_buffer_advance (p0, sizeof (*pheader0));
- if (ip4_to_ip6_tcp_udp (p0, ip4_to_ip6_set_cb, pheader0))
+ if (map_ip4_to_ip6_tcp_udp (p0, pheader0))
{
p0->error = error_node->errors[MAP_ERROR_UNKNOWN];
next0 = IP4_MAPT_TCP_UDP_NEXT_DROP;
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
-#ifdef IP4_MAP_T_DUAL_LOOP
- while (n_left_from >= 4 && n_left_to_next >= 2)
- {
- u32 pi0, pi1;
- vlib_buffer_t *p0, *p1;
- ip4_header_t *ip40, *ip41;
- map_domain_t *d0, *d1;
- ip4_mapt_next_t next0 = 0, next1 = 0;
- u16 ip4_len0, ip4_len1;
- u8 error0, error1;
- i32 dst_port0, dst_port1;
- ip4_mapt_pseudo_header_t *pheader0, *pheader1;
-
- pi0 = to_next[0] = from[0];
- pi1 = to_next[1] = from[1];
- from += 2;
- n_left_from -= 2;
- to_next += 2;
- n_left_to_next -= 2;
- error0 = MAP_ERROR_NONE;
- error1 = MAP_ERROR_NONE;
-
- p0 = vlib_get_buffer (vm, pi0);
- p1 = vlib_get_buffer (vm, pi1);
- ip40 = vlib_buffer_get_current (p0);
- ip41 = vlib_buffer_get_current (p1);
- ip4_len0 = clib_host_to_net_u16 (ip40->length);
- ip4_len1 = clib_host_to_net_u16 (ip41->length);
-
- if (PREDICT_FALSE (p0->current_length < ip4_len0 ||
- ip40->ip_version_and_header_length != 0x45))
- {
- error0 = MAP_ERROR_UNKNOWN;
- next0 = IP4_MAPT_NEXT_DROP;
- }
-
- if (PREDICT_FALSE (p1->current_length < ip4_len1 ||
- ip41->ip_version_and_header_length != 0x45))
- {
- error1 = MAP_ERROR_UNKNOWN;
- next1 = IP4_MAPT_NEXT_DROP;
- }
-
- vnet_buffer (p0)->map_t.map_domain_index =
- vnet_buffer (p0)->ip.adj_index[VLIB_TX];
- d0 = ip4_map_get_domain (vnet_buffer (p0)->map_t.map_domain_index);
- vnet_buffer (p1)->map_t.map_domain_index =
- vnet_buffer (p1)->ip.adj_index[VLIB_TX];
- d1 = ip4_map_get_domain (vnet_buffer (p1)->map_t.map_domain_index);
-
- vnet_buffer (p0)->map_t.mtu = d0->mtu ? d0->mtu : ~0;
- vnet_buffer (p1)->map_t.mtu = d1->mtu ? d1->mtu : ~0;
-
- dst_port0 = -1;
- dst_port1 = -1;
-
- ip4_map_t_classify (p0, d0, ip40, ip4_len0, &dst_port0, &error0,
- &next0);
- ip4_map_t_classify (p1, d1, ip41, ip4_len1, &dst_port1, &error1,
- &next1);
-
- //Add MAP-T pseudo header in front of the packet
- vlib_buffer_advance (p0, -sizeof (*pheader0));
- vlib_buffer_advance (p1, -sizeof (*pheader1));
- pheader0 = vlib_buffer_get_current (p0);
- pheader1 = vlib_buffer_get_current (p1);
-
- //Save addresses within the packet
- ip4_map_t_embedded_address (d0, &pheader0->saddr,
- &ip40->src_address);
- ip4_map_t_embedded_address (d1, &pheader1->saddr,
- &ip41->src_address);
- pheader0->daddr.as_u64[0] =
- map_get_pfx_net (d0, ip40->dst_address.as_u32, (u16) dst_port0);
- pheader0->daddr.as_u64[1] =
- map_get_sfx_net (d0, ip40->dst_address.as_u32, (u16) dst_port0);
- pheader1->daddr.as_u64[0] =
- map_get_pfx_net (d1, ip41->dst_address.as_u32, (u16) dst_port1);
- pheader1->daddr.as_u64[1] =
- map_get_sfx_net (d1, ip41->dst_address.as_u32, (u16) dst_port1);
-
- if (PREDICT_FALSE
- (ip4_is_first_fragment (ip40) && (dst_port0 != -1)
- && (d0->ea_bits_len != 0 || !d0->rules)
- && ip4_map_fragment_cache (ip40, dst_port0)))
- {
- error0 = MAP_ERROR_FRAGMENT_MEMORY;
- }
-
- if (PREDICT_FALSE
- (ip4_is_first_fragment (ip41) && (dst_port1 != -1)
- && (d1->ea_bits_len != 0 || !d1->rules)
- && ip4_map_fragment_cache (ip41, dst_port1)))
- {
- error1 = MAP_ERROR_FRAGMENT_MEMORY;
- }
-
- if (PREDICT_TRUE
- (error0 == MAP_ERROR_NONE && next0 != IP4_MAPT_NEXT_MAPT_ICMP))
- {
- vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_TX,
- thread_index,
- vnet_buffer (p0)->
- map_t.map_domain_index, 1,
- clib_net_to_host_u16
- (ip40->length));
- }
-
- if (PREDICT_TRUE
- (error1 == MAP_ERROR_NONE && next1 != IP4_MAPT_NEXT_MAPT_ICMP))
- {
- vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_TX,
- thread_index,
- vnet_buffer (p1)->
- map_t.map_domain_index, 1,
- clib_net_to_host_u16
- (ip41->length));
- }
-
- next0 = (error0 != MAP_ERROR_NONE) ? IP4_MAPT_NEXT_DROP : next0;
- next1 = (error1 != MAP_ERROR_NONE) ? IP4_MAPT_NEXT_DROP : next1;
- p0->error = error_node->errors[error0];
- p1->error = error_node->errors[error1];
- vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
- n_left_to_next, pi0, pi1, next0,
- next1);
- }
-#endif
-
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 pi0;
vlib_buffer_t *p0;
ip4_header_t *ip40;
map_domain_t *d0;
- ip4_mapt_next_t next0;
+ ip4_mapt_next_t next0 = 0;
u16 ip4_len0;
u8 error0;
i32 dst_port0;
ip40->ip_version_and_header_length != 0x45))
{
error0 = MAP_ERROR_UNKNOWN;
- next0 = IP4_MAPT_NEXT_DROP;
}
- vnet_buffer (p0)->map_t.map_domain_index =
- vnet_buffer (p0)->ip.adj_index[VLIB_TX];
- d0 = ip4_map_get_domain (vnet_buffer (p0)->map_t.map_domain_index);
+ d0 = ip4_map_get_domain (&ip40->dst_address,
+ &vnet_buffer (p0)->map_t.map_domain_index,
+ &error0);
+
+ if (!d0)
+ { /* Guess it wasn't for us */
+ vnet_feature_next (&next0, p0);
+ goto exit;
+ }
vnet_buffer (p0)->map_t.mtu = d0->mtu ? d0->mtu : ~0;
pheader0->daddr.as_u64[1] =
map_get_sfx_net (d0, ip40->dst_address.as_u32, (u16) dst_port0);
- //It is important to cache at this stage because the result might be necessary
- //for packets within the same vector.
- //Actually, this approach even provides some limited out-of-order fragments support
+ // It is important to cache at this stage because the result
+ // might be necessary for packets within the same vector.
+ // Actually, this approach even provides some limited
+ // out-of-order fragments support
if (PREDICT_FALSE
(ip4_is_first_fragment (ip40) && (dst_port0 != -1)
&& (d0->ea_bits_len != 0 || !d0->rules)
next0 = (error0 != MAP_ERROR_NONE) ? IP4_MAPT_NEXT_DROP : next0;
p0->error = error_node->errors[error0];
+ exit:
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next, pi0,
next0);
#undef _
};
+VNET_FEATURE_INIT (ip4_map_t_feature, static) =
+{
+.arc_name = "ip4-unicast",.node_name = "ip4-map-t",.runs_before =
+ VNET_FEATURES ("ip4-flow-classify"),};
+
/* *INDENT-OFF* */
VLIB_REGISTER_NODE(ip4_map_t_fragmented_node) = {
.function = ip4_map_t_fragmented,
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