/**
* IPv6 to IPv4 set call back function type
*/
-typedef int (*ip6_to_ip4_set_fn_t) (ip6_header_t * ip6, ip4_header_t * ip4,
- void *ctx);
+typedef int (*ip6_to_ip4_icmp_set_fn_t) (ip6_header_t * ip6,
+ ip4_header_t * ip4, void *ctx);
+
+typedef int (*ip6_to_ip4_tcp_udp_set_fn_t) (vlib_buffer_t * b,
+ ip6_header_t * ip6,
+ ip4_header_t * ip4, void *ctx);
/* *INDENT-OFF* */
static u8 icmp6_to_icmp_updater_pointer_table[] =
/**
* @brief Parse some useful information from IPv6 header.
*
+ * @param vm vlib main
+ * @param b vlib buffer
* @param ip6 IPv6 header.
* @param buff_len Buffer length.
* @param l4_protocol L4 protocol number.
* @returns 0 on success, non-zero value otherwise.
*/
static_always_inline int
-ip6_parse (const ip6_header_t * ip6, u32 buff_len,
- u8 * l4_protocol, u16 * l4_offset, u16 * frag_hdr_offset)
+ip6_parse (vlib_main_t * vm, vlib_buffer_t * b, const ip6_header_t * ip6,
+ u32 buff_len, u8 * l4_protocol, u16 * l4_offset,
+ u16 * frag_hdr_offset)
{
- if (ip6->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
+ ip6_ext_header_t *last_hdr, *frag_hdr;
+ u32 length;
+ if (ip6_walk_ext_hdr
+ (vm, b, ip6, IP_PROTOCOL_IPV6_FRAGMENTATION, &length, &frag_hdr,
+ &last_hdr))
{
- *l4_protocol = ((ip6_frag_hdr_t *) (ip6 + 1))->next_hdr;
- *frag_hdr_offset = sizeof (*ip6);
- *l4_offset = sizeof (*ip6) + sizeof (ip6_frag_hdr_t);
+ return -1;
+ }
+
+ if (length > 0)
+ {
+ if (frag_hdr)
+ {
+ *frag_hdr_offset = (u8 *) frag_hdr - (u8 *) ip6;
+ }
+ else
+ {
+ *frag_hdr_offset = 0;
+ }
+ *l4_protocol = last_hdr->next_hdr;
}
else
{
- *l4_protocol = ip6->protocol;
*frag_hdr_offset = 0;
- *l4_offset = sizeof (*ip6);
+ *l4_protocol = ip6->protocol;
}
+ *l4_offset = sizeof (*ip6) + length;
return (buff_len < (*l4_offset + 4)) ||
(clib_net_to_host_u16 (ip6->payload_length) <
}
/**
- * @brief Get TCP/UDP port number or ICMP id from IPv6 packet.
+ * @brief Get L4 information like port number or ICMP id from IPv6 packet.
*
* @param ip6 IPv6 header.
- * @param sender 1 get sender port, 0 get receiver port.
* @param buffer_len Buffer length.
+ * @param ip_protocol L4 protocol
+ * @param src_port L4 src port or icmp id
+ * @param dst_post L4 dst port or icmp id
+ * @param icmp_type_or_tcp_flags ICMP type or TCP flags, if applicable
+ * @param tcp_ack_number TCP ack number, if applicable
+ * @param tcp_seq_number TCP seq number, if applicable
*
- * @returns Port number on success, 0 otherwise.
+ * @returns 1 on success, 0 otherwise.
*/
always_inline u16
-ip6_get_port (ip6_header_t * ip6, u8 sender, u16 buffer_len)
+ip6_get_port (vlib_main_t * vm, vlib_buffer_t * b, ip6_header_t * ip6,
+ u16 buffer_len, u8 * ip_protocol, u16 * src_port,
+ u16 * dst_port, u8 * icmp_type_or_tcp_flags,
+ u32 * tcp_ack_number, u32 * tcp_seq_number)
{
u8 l4_protocol;
u16 l4_offset;
u16 frag_offset;
u8 *l4;
- if (ip6_parse (ip6, buffer_len, &l4_protocol, &l4_offset, &frag_offset))
+ if (ip6_parse
+ (vm, b, ip6, buffer_len, &l4_protocol, &l4_offset, &frag_offset))
return 0;
if (frag_offset &&
u8_ptr_add (ip6, frag_offset))))
return 0; //Can't deal with non-first fragment for now
+ if (ip_protocol)
+ {
+ *ip_protocol = l4_protocol;
+ }
l4 = u8_ptr_add (ip6, l4_offset);
if (l4_protocol == IP_PROTOCOL_TCP || l4_protocol == IP_PROTOCOL_UDP)
{
- return (sender) ? ((udp_header_t *) (l4))->src_port : ((udp_header_t
- *)
- (l4))->dst_port;
+ if (src_port)
+ *src_port = ((udp_header_t *) (l4))->src_port;
+ if (dst_port)
+ *dst_port = ((udp_header_t *) (l4))->dst_port;
+ if (icmp_type_or_tcp_flags && l4_protocol == IP_PROTOCOL_TCP)
+ *icmp_type_or_tcp_flags = ((tcp_header_t *) (l4))->flags;
+ if (tcp_ack_number && l4_protocol == IP_PROTOCOL_TCP)
+ *tcp_ack_number = ((tcp_header_t *) (l4))->ack_number;
+ if (tcp_seq_number && l4_protocol == IP_PROTOCOL_TCP)
+ *tcp_seq_number = ((tcp_header_t *) (l4))->seq_number;
}
else if (l4_protocol == IP_PROTOCOL_ICMP6)
{
icmp46_header_t *icmp = (icmp46_header_t *) (l4);
+ if (icmp_type_or_tcp_flags)
+ *icmp_type_or_tcp_flags = ((icmp46_header_t *) (l4))->type;
if (icmp->type == ICMP6_echo_request)
{
- return (sender) ? ((u16 *) (icmp))[2] : -1;
+ if (src_port)
+ *src_port = ((u16 *) (icmp))[2];
+ if (dst_port)
+ *dst_port = ((u16 *) (icmp))[2];
}
else if (icmp->type == ICMP6_echo_reply)
{
- return (sender) ? -1 : ((u16 *) (icmp))[2];
+ if (src_port)
+ *src_port = ((u16 *) (icmp))[2];
+ if (dst_port)
+ *dst_port = ((u16 *) (icmp))[2];
}
}
- return 0;
+ return 1;
}
/**
/**
* @brief Translate TOS value from IPv6 to IPv4.
*
- * @param ip6 IPv6 header.
+ * @param ip_version_traffic_class_and_flow_label in network byte order
*
* @returns IPv4 TOS value.
*/
static_always_inline u8
-ip6_translate_tos (const ip6_header_t * ip6)
+ip6_translate_tos (u32 ip_version_traffic_class_and_flow_label)
{
- return (clib_net_to_host_u32 (ip6->ip_version_traffic_class_and_flow_label)
+ return (clib_net_to_host_u32 (ip_version_traffic_class_and_flow_label)
& 0x0ff00000) >> 20;
}
* @returns 0 on success, non-zero value otherwise.
*/
always_inline int
-icmp6_to_icmp (vlib_buffer_t * p, ip6_to_ip4_set_fn_t fn, void *ctx,
- ip6_to_ip4_set_fn_t inner_fn, void *inner_ctx)
+icmp6_to_icmp (vlib_main_t * vm, vlib_buffer_t * p,
+ ip6_to_ip4_icmp_set_fn_t fn, void *ctx,
+ ip6_to_ip4_icmp_set_fn_t inner_fn, void *inner_ctx)
{
ip6_header_t *ip6, *inner_ip6;
ip4_header_t *ip4, *inner_ip4;
// TO
// [ IPv4][IC][ IPv4][L4 header ...
- if (ip6_parse (inner_ip6, ip6_pay_len - 8,
+ if (ip6_parse (vm, p, inner_ip6, ip6_pay_len - 8,
&inner_protocol, &inner_l4_offset, &inner_frag_offset))
return -1;
inner_ip4->ip_version_and_header_length =
IP4_VERSION_AND_HEADER_LENGTH_NO_OPTIONS;
- inner_ip4->tos = ip6_translate_tos (inner_ip6);
+ inner_ip4->tos =
+ ip6_translate_tos
+ (inner_ip6->ip_version_traffic_class_and_flow_label);
inner_ip4->length =
u16_net_add (inner_ip6->payload_length,
sizeof (*ip4) + sizeof (*ip6) - inner_l4_offset);
ip4->ip_version_and_header_length =
IP4_VERSION_AND_HEADER_LENGTH_NO_OPTIONS;
- ip4->tos = ip6_translate_tos (ip6);
+ ip4->tos = ip6_translate_tos (ip6->ip_version_traffic_class_and_flow_label);
ip4->fragment_id = 0;
ip4->flags_and_fragment_offset = 0;
ip4->ttl = ip6->hop_limit;
return 0;
}
-/**
- * @brief Translate IPv6 fragmented packet to IPv4.
- *
- * @param p Buffer to translate.
- * @param fn The function to translate header.
- * @param ctx A context passed in the header translate function.
- *
- * @returns 0 on success, non-zero value otherwise.
- */
-always_inline int
-ip6_to_ip4_fragmented (vlib_buffer_t * p, ip6_to_ip4_set_fn_t fn, void *ctx)
-{
- ip6_header_t *ip6;
- ip6_frag_hdr_t *frag;
- ip4_header_t *ip4;
- u16 frag_id;
- u8 frag_more;
- u16 frag_offset;
- u8 l4_protocol;
- u16 l4_offset;
- int rv;
-
- ip6 = vlib_buffer_get_current (p);
-
- if (ip6_parse
- (ip6, p->current_length, &l4_protocol, &l4_offset, &frag_offset))
- return -1;
-
- frag = (ip6_frag_hdr_t *) u8_ptr_add (ip6, frag_offset);
- ip4 = (ip4_header_t *) u8_ptr_add (ip6, l4_offset - sizeof (*ip4));
- vlib_buffer_advance (p, l4_offset - sizeof (*ip4));
-
- frag_id = frag_id_6to4 (frag->identification);
- frag_more = ip6_frag_hdr_more (frag);
- frag_offset = ip6_frag_hdr_offset (frag);
-
- if ((rv = fn (ip6, ip4, ctx)) != 0)
- return rv;
-
- ip4->ip_version_and_header_length =
- IP4_VERSION_AND_HEADER_LENGTH_NO_OPTIONS;
- ip4->tos = ip6_translate_tos (ip6);
- ip4->length = u16_net_add (ip6->payload_length,
- sizeof (*ip4) - l4_offset + sizeof (*ip6));
- ip4->fragment_id = frag_id;
- ip4->flags_and_fragment_offset =
- clib_host_to_net_u16 (frag_offset |
- (frag_more ? IP4_HEADER_FLAG_MORE_FRAGMENTS : 0));
- ip4->ttl = ip6->hop_limit;
- ip4->protocol =
- (l4_protocol == IP_PROTOCOL_ICMP6) ? IP_PROTOCOL_ICMP : l4_protocol;
- ip4->checksum = ip4_header_checksum (ip4);
-
- return 0;
-}
-
-/**
- * @brief Translate IPv6 UDP/TCP packet to IPv4.
- *
- * @param p Buffer to translate.
- * @param fn The function to translate header.
- * @param ctx A context passed in the header translate function.
- *
- * @returns 0 on success, non-zero value otherwise.
- */
-always_inline int
-ip6_to_ip4_tcp_udp (vlib_buffer_t * p, ip6_to_ip4_set_fn_t fn, void *ctx,
- u8 udp_checksum)
-{
- ip6_header_t *ip6;
- u16 *checksum;
- ip_csum_t csum = 0;
- ip4_header_t *ip4;
- u16 fragment_id;
- u16 flags;
- u16 frag_offset;
- u8 l4_protocol;
- u16 l4_offset;
- int rv;
- ip6_address_t old_src, old_dst;
-
- ip6 = vlib_buffer_get_current (p);
-
- if (ip6_parse
- (ip6, p->current_length, &l4_protocol, &l4_offset, &frag_offset))
- return -1;
-
- if (l4_protocol == IP_PROTOCOL_TCP)
- {
- tcp_header_t *tcp = ip6_next_header (ip6);
- checksum = &tcp->checksum;
- }
- else
- {
- udp_header_t *udp = ip6_next_header (ip6);
- checksum = &udp->checksum;
- }
-
- old_src.as_u64[0] = ip6->src_address.as_u64[0];
- old_src.as_u64[1] = ip6->src_address.as_u64[1];
- old_dst.as_u64[0] = ip6->dst_address.as_u64[0];
- old_dst.as_u64[1] = ip6->dst_address.as_u64[1];
-
- ip4 = (ip4_header_t *) u8_ptr_add (ip6, l4_offset - sizeof (*ip4));
-
- vlib_buffer_advance (p, l4_offset - sizeof (*ip4));
-
- if (PREDICT_FALSE (frag_offset))
- {
- //Only the first fragment
- ip6_frag_hdr_t *hdr = (ip6_frag_hdr_t *) u8_ptr_add (ip6, frag_offset);
- fragment_id = frag_id_6to4 (hdr->identification);
- flags = clib_host_to_net_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS);
- }
- else
- {
- fragment_id = 0;
- flags = 0;
- }
-
- if ((rv = fn (ip6, ip4, ctx)) != 0)
- return rv;
-
- ip4->ip_version_and_header_length =
- IP4_VERSION_AND_HEADER_LENGTH_NO_OPTIONS;
- ip4->tos = ip6_translate_tos (ip6);
- ip4->length = u16_net_add (ip6->payload_length,
- sizeof (*ip4) + sizeof (*ip6) - l4_offset);
- ip4->fragment_id = fragment_id;
- ip4->flags_and_fragment_offset = flags;
- ip4->ttl = ip6->hop_limit;
- ip4->protocol = l4_protocol;
- ip4->checksum = ip4_header_checksum (ip4);
-
- //UDP checksum is optional over IPv4
- if (!udp_checksum && l4_protocol == IP_PROTOCOL_UDP)
- {
- *checksum = 0;
- }
- else
- {
- csum = ip_csum_sub_even (*checksum, old_src.as_u64[0]);
- csum = ip_csum_sub_even (csum, old_src.as_u64[1]);
- csum = ip_csum_sub_even (csum, old_dst.as_u64[0]);
- csum = ip_csum_sub_even (csum, old_dst.as_u64[1]);
- csum = ip_csum_add_even (csum, ip4->dst_address.as_u32);
- csum = ip_csum_add_even (csum, ip4->src_address.as_u32);
- *checksum = ip_csum_fold (csum);
- }
-
- return 0;
-}
-
-/**
- * @brief Translate IPv6 packet to IPv4 (IP header only).
- *
- * @param p Buffer to translate.
- * @param fn The function to translate header.
- * @param ctx A context passed in the header translate function.
- *
- * @returns 0 on success, non-zero value otherwise.
- */
-always_inline int
-ip6_to_ip4 (vlib_buffer_t * p, ip6_to_ip4_set_fn_t fn, void *ctx)
-{
- ip6_header_t *ip6;
- ip4_header_t *ip4;
- u16 fragment_id;
- u16 flags;
- u16 frag_offset;
- u8 l4_protocol;
- u16 l4_offset;
- int rv;
-
- ip6 = vlib_buffer_get_current (p);
-
- if (ip6_parse
- (ip6, p->current_length, &l4_protocol, &l4_offset, &frag_offset))
- return -1;
-
- ip4 = (ip4_header_t *) u8_ptr_add (ip6, l4_offset - sizeof (*ip4));
-
- vlib_buffer_advance (p, l4_offset - sizeof (*ip4));
-
- if (PREDICT_FALSE (frag_offset))
- {
- //Only the first fragment
- ip6_frag_hdr_t *hdr = (ip6_frag_hdr_t *) u8_ptr_add (ip6, frag_offset);
- fragment_id = frag_id_6to4 (hdr->identification);
- flags = clib_host_to_net_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS);
- }
- else
- {
- fragment_id = 0;
- flags = 0;
- }
-
- if ((rv = fn (ip6, ip4, ctx)) != 0)
- return rv;
-
- ip4->ip_version_and_header_length =
- IP4_VERSION_AND_HEADER_LENGTH_NO_OPTIONS;
- ip4->tos = ip6_translate_tos (ip6);
- ip4->length = u16_net_add (ip6->payload_length,
- sizeof (*ip4) + sizeof (*ip6) - l4_offset);
- ip4->fragment_id = fragment_id;
- ip4->flags_and_fragment_offset = flags;
- ip4->ttl = ip6->hop_limit;
- ip4->protocol = l4_protocol;
- ip4->checksum = ip4_header_checksum (ip4);
-
- return 0;
-}
-
#endif /* __included_ip6_to_ip4_h__ */
/*
Code Review / vpp.git / blobdiff