#ifndef included_ip6_packet_h
#define included_ip6_packet_h
-#include <vnet/tcp/tcp_packet.h>
+#include <vlib/vlib.h>
#include <vnet/ip/ip4_packet.h>
+#include <stdbool.h>
typedef union
{
u16 as_u16[8];
u32 as_u32[4];
u64 as_u64[2];
+ u64x2 as_u128;
uword as_uword[16 / sizeof (uword)];
}
-ip6_address_t;
+__clib_packed ip6_address_t;
+
+STATIC_ASSERT_SIZEOF (ip6_address_t, 16);
+
+typedef struct
+{
+ ip6_address_t addr, mask;
+} ip6_address_and_mask_t;
/* Packed so that the mhash key doesn't include uninitialized pad bytes */
-/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
/* IP address must be first for ip_interface_address_get_address() to work */
ip6_address_t ip6_addr;
u32 fib_index;
}) ip6_address_fib_t;
-/* *INDENT-ON* */
-
-/* *INDENT-OFF* */
-typedef CLIB_PACKED (union {
- struct {
- u32 pad[3];
- ip4_address_t ip4;
- };
- ip6_address_t ip6;
- u8 as_u8[16];
- u64 as_u64[2];
-}) ip46_address_t;
-/* *INDENT-ON* */
-#define ip46_address_is_ip4(ip46) (((ip46)->pad[0] | (ip46)->pad[1] | (ip46)->pad[2]) == 0)
-#define ip46_address_mask_ip4(ip46) ((ip46)->pad[0] = (ip46)->pad[1] = (ip46)->pad[2] = 0)
-#define ip46_address_set_ip4(ip46, ip) (ip46_address_mask_ip4(ip46), (ip46)->ip4 = (ip)[0])
-#define ip46_address_reset(ip46) ((ip46)->as_u64[0] = (ip46)->as_u64[1] = 0)
-#define ip46_address_cmp(ip46_1, ip46_2) (memcmp(ip46_1, ip46_2, sizeof(*ip46_1)))
-#define ip46_address_is_zero(ip46) (((ip46)->as_u64[0] == 0) && ((ip46)->as_u64[1] == 0))
-#define ip46_address_is_equal(a1, a2) (((a1)->as_u64[0] == (a2)->as_u64[0]) \
- && ((a1)->as_u64[1] == (a2)->as_u64[1]))
-
-always_inline void
-ip46_from_addr_buf (u32 is_ipv6, u8 * buf, ip46_address_t * ip)
-{
- if (is_ipv6)
- ip->ip6 = *((ip6_address_t *) buf);
- else
- ip46_address_set_ip4 (ip, (ip4_address_t *) buf);
-}
always_inline void
-ip6_addr_fib_init (ip6_address_fib_t * addr_fib, ip6_address_t * address,
- u32 fib_index)
+ip6_addr_fib_init (ip6_address_fib_t * addr_fib,
+ const ip6_address_t * address, u32 fib_index)
{
- addr_fib->ip6_addr.as_u64[0] = address->as_u64[0];
- addr_fib->ip6_addr.as_u64[1] = address->as_u64[1];
+ addr_fib->ip6_addr = *address;
addr_fib->fib_index = fib_index;
}
} ip6_multicast_link_local_group_id_t;
always_inline uword
-ip6_address_is_multicast (ip6_address_t * a)
+ip6_address_is_multicast (const ip6_address_t * a)
{
return a->as_u8[0] == 0xff;
}
-always_inline uword
-ip46_address_is_multicast (ip46_address_t * a)
+always_inline void
+ip6_address_copy (ip6_address_t * dst, const ip6_address_t * src)
{
- return ip46_address_is_ip4 (a) ? ip4_address_is_multicast (&a->ip4) :
- ip6_address_is_multicast (&a->ip6);
+ dst->as_u64[0] = src->as_u64[0];
+ dst->as_u64[1] = src->as_u64[1];
}
always_inline void
a->as_u32[3] = clib_host_to_net_u32 (id);
}
-always_inline void
-ip6_link_local_address_from_ethernet_address (ip6_address_t * a,
- u8 * ethernet_address)
-{
- a->as_u64[0] = a->as_u64[1] = 0;
- a->as_u16[0] = clib_host_to_net_u16 (0xfe80);
- /* Always set locally administered bit (6). */
- a->as_u8[0x8] = ethernet_address[0] | (1 << 6);
- a->as_u8[0x9] = ethernet_address[1];
- a->as_u8[0xa] = ethernet_address[2];
- a->as_u8[0xb] = 0xff;
- a->as_u8[0xc] = 0xfe;
- a->as_u8[0xd] = ethernet_address[3];
- a->as_u8[0xe] = ethernet_address[4];
- a->as_u8[0xf] = ethernet_address[5];
-}
-
always_inline void
ip6_multicast_ethernet_address (u8 * ethernet_address, u32 group_id)
{
}
always_inline uword
-ip6_address_is_equal (ip6_address_t * a, ip6_address_t * b)
+ip6_address_is_equal (const ip6_address_t * a, const ip6_address_t * b)
{
int i;
for (i = 0; i < ARRAY_LEN (a->as_uword); i++)
}
always_inline uword
-ip6_address_is_equal_masked (ip6_address_t * a, ip6_address_t * b,
- ip6_address_t * mask)
+ip6_address_is_equal_masked (const ip6_address_t * a,
+ const ip6_address_t * b,
+ const ip6_address_t * mask)
{
int i;
for (i = 0; i < ARRAY_LEN (a->as_uword); i++)
}
always_inline void
-ip6_address_mask (ip6_address_t * a, ip6_address_t * mask)
+ip6_address_mask (ip6_address_t * a, const ip6_address_t * mask)
{
int i;
for (i = 0; i < ARRAY_LEN (a->as_uword); i++)
{
int i, byte, bit, bitnum;
ASSERT (width <= 128);
- memset (a, 0, sizeof (a[0]));
+ clib_memset (a, 0, sizeof (a[0]));
for (i = 0; i < width; i++)
{
bitnum = (7 - (i & 7));
}
always_inline uword
-ip6_address_is_zero (ip6_address_t * a)
+ip6_address_is_zero (const ip6_address_t * a)
{
int i;
for (i = 0; i < ARRAY_LEN (a->as_uword); i++)
/* Check for unspecified address ::0 */
always_inline uword
-ip6_address_is_unspecified (ip6_address_t * a)
+ip6_address_is_unspecified (const ip6_address_t * a)
{
return ip6_address_is_zero (a);
}
/* Check for loopback address ::1 */
always_inline uword
-ip6_address_is_loopback (ip6_address_t * a)
+ip6_address_is_loopback (const ip6_address_t * a)
{
- uword is_loopback;
- u8 save = a->as_u8[15];
- a->as_u8[15] = save ^ 1;
- is_loopback = ip6_address_is_zero (a);
- a->as_u8[15] = save;
- return is_loopback;
+ return (a->as_u64[0] == 0 &&
+ a->as_u32[2] == 0 &&
+ a->as_u16[6] == 0 && a->as_u8[14] == 0 && a->as_u8[15] == 1);
}
/* Check for link local unicast fe80::/10. */
always_inline uword
-ip6_address_is_link_local_unicast (ip6_address_t * a)
+ip6_address_is_link_local_unicast (const ip6_address_t * a)
{
return a->as_u8[0] == 0xfe && (a->as_u8[1] & 0xc0) == 0x80;
}
/* Check for unique local unicast fc00::/7. */
always_inline uword
-ip6_address_is_local_unicast (ip6_address_t * a)
+ip6_address_is_local_unicast (const ip6_address_t * a)
{
return (a->as_u8[0] & 0xfe) == 0xfc;
}
/* Check for unique global unicast 2000::/3. */
always_inline uword
-ip6_address_is_global_unicast (ip6_address_t * a)
+ip6_address_is_global_unicast (const ip6_address_t * a)
{
return (a->as_u8[0] & 0xe0) == 0x20;
}
/* Check for solicited node multicast 0xff02::1:ff00:0/104 */
always_inline uword
-ip6_is_solicited_node_multicast_address (ip6_address_t * a)
+ip6_is_solicited_node_multicast_address (const ip6_address_t * a)
{
return (a->as_u32[0] == clib_host_to_net_u32 (0xff020000)
&& a->as_u32[1] == 0
&& a->as_u8[12] == 0xff);
}
+always_inline u32
+ip6_address_hash_to_u32 (const ip6_address_t * a)
+{
+ return (a->as_u32[0] ^ a->as_u32[1] ^ a->as_u32[2] ^ a->as_u32[3]);
+}
+
+always_inline u64
+ip6_address_hash_to_u64 (const ip6_address_t * a)
+{
+ return (a->as_u64[0] ^ a->as_u64[1]);
+}
+
typedef struct
{
/* 4 bit version, 8 bit traffic class and 20 bit flow label. */
ip6_address_t src_address, dst_address;
} ip6_header_t;
+#define IP6_PACKET_TC_MASK 0x0FF00000
+#define IP6_PACKET_DSCP_MASK 0x0FC00000
+#define IP6_PACKET_ECN_MASK 0x00300000
+#define IP6_PACKET_FL_MASK 0x000FFFFF
+
+always_inline ip_dscp_t
+ip6_traffic_class (const ip6_header_t * i)
+{
+ return (i->ip_version_traffic_class_and_flow_label & IP6_PACKET_TC_MASK) >>
+ 20;
+}
+
+static_always_inline ip_dscp_t
+ip6_traffic_class_network_order (const ip6_header_t * ip6)
+{
+ return (clib_net_to_host_u32 (ip6->ip_version_traffic_class_and_flow_label)
+ & IP6_PACKET_TC_MASK) >> 20;
+}
+
+static_always_inline ip_dscp_t
+ip6_dscp_network_order (const ip6_header_t * ip6)
+{
+ return (clib_net_to_host_u32 (ip6->ip_version_traffic_class_and_flow_label)
+ & IP6_PACKET_DSCP_MASK) >> 22;
+}
+
+static_always_inline ip_ecn_t
+ip6_ecn_network_order (const ip6_header_t * ip6)
+{
+ return (clib_net_to_host_u32 (ip6->ip_version_traffic_class_and_flow_label)
+ & IP6_PACKET_ECN_MASK) >> 20;
+}
+
+static_always_inline void
+ip6_set_traffic_class_network_order (ip6_header_t * ip6, ip_dscp_t dscp)
+{
+ u32 tmp =
+ clib_net_to_host_u32 (ip6->ip_version_traffic_class_and_flow_label);
+ tmp &= 0xf00fffff;
+ tmp |= (dscp << 20);
+ ip6->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (tmp);
+}
+
+static_always_inline void
+ip6_set_dscp_network_order (ip6_header_t * ip6, ip_dscp_t dscp)
+{
+ u32 tmp =
+ clib_net_to_host_u32 (ip6->ip_version_traffic_class_and_flow_label);
+ tmp &= 0xf03fffff;
+ tmp |= (dscp << 22);
+ ip6->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (tmp);
+}
+
+static_always_inline void
+ip6_set_ecn_network_order (ip6_header_t * ip6, ip_ecn_t ecn)
+{
+ u32 tmp =
+ clib_net_to_host_u32 (ip6->ip_version_traffic_class_and_flow_label);
+ tmp &= 0xffcfffff;
+ tmp |= ((0x3 & ecn) << 20);
+ ip6->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (tmp);
+}
+
+static_always_inline u32
+ip6_flow_label_network_order (const ip6_header_t *ip6)
+{
+ u32 tmp =
+ clib_net_to_host_u32 (ip6->ip_version_traffic_class_and_flow_label);
+ return (tmp & 0xfffff);
+}
+
+static_always_inline void
+ip6_set_flow_label_network_order (ip6_header_t *ip6, u32 flow_label)
+{
+ u32 tmp =
+ clib_net_to_host_u32 (ip6->ip_version_traffic_class_and_flow_label);
+ tmp &= 0xfff00000;
+ tmp |= flow_label & 0x000fffff;
+ ip6->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (tmp);
+}
+
+static_always_inline u32
+ip6_hop_limit_network_order (const ip6_header_t *ip6)
+{
+ return (ip6->hop_limit);
+}
+
+static_always_inline void
+ip6_set_hop_limit_network_order (ip6_header_t *ip6, u8 hop_limit)
+{
+ ip6->hop_limit = hop_limit;
+}
+
always_inline void *
ip6_next_header (ip6_header_t * i)
{
dst->dst_address.as_uword[1] = src->dst_address.as_uword[1];
}
-always_inline void
-ip6_tcp_reply_x1 (ip6_header_t * ip0, tcp_header_t * tcp0)
-{
- {
- ip6_address_t src0, dst0;
-
- src0 = ip0->src_address;
- dst0 = ip0->dst_address;
- ip0->src_address = dst0;
- ip0->dst_address = src0;
- }
-
- {
- u16 src0, dst0;
-
- src0 = tcp0->src;
- dst0 = tcp0->dst;
- tcp0->src = dst0;
- tcp0->dst = src0;
- }
-}
-
-always_inline void
-ip6_tcp_reply_x2 (ip6_header_t * ip0, ip6_header_t * ip1,
- tcp_header_t * tcp0, tcp_header_t * tcp1)
-{
- {
- ip6_address_t src0, dst0, src1, dst1;
-
- src0 = ip0->src_address;
- src1 = ip1->src_address;
- dst0 = ip0->dst_address;
- dst1 = ip1->dst_address;
- ip0->src_address = dst0;
- ip1->src_address = dst1;
- ip0->dst_address = src0;
- ip1->dst_address = src1;
- }
-
- {
- u16 src0, dst0, src1, dst1;
-
- src0 = tcp0->src;
- src1 = tcp1->src;
- dst0 = tcp0->dst;
- dst1 = tcp1->dst;
- tcp0->src = dst0;
- tcp1->src = dst1;
- tcp0->dst = src0;
- tcp1->dst = src1;
- }
-}
-
-
-/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
u8 data;
}) ip6_pad1_option_t;
-/* *INDENT-ON* */
-/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
u8 type;
u8 len;
u8 data[0];
}) ip6_padN_option_t;
-/* *INDENT-ON* */
-/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
#define IP6_MLDP_ALERT_TYPE 0x5
u8 type;
u8 len;
u16 value;
}) ip6_router_alert_option_t;
-/* *INDENT-ON* */
-/* *INDENT-OFF* */
+typedef CLIB_PACKED (struct {
+ u8 protocol;
+ u8 reserved;
+ u16 fragoff;
+ u32 id;
+}) ip6_fragment_ext_header_t;
+
typedef CLIB_PACKED (struct {
u8 next_hdr;
/* Length of this header plus option data in 8 byte units. */
u8 n_data_u64s;
}) ip6_ext_header_t;
-always_inline u8 ip6_ext_hdr(u8 nexthdr)
+#define foreach_ext_hdr_type \
+ _(IP6_HOP_BY_HOP_OPTIONS) \
+ _(IPV6_ROUTE) \
+ _(IP6_DESTINATION_OPTIONS) \
+ _(MOBILITY) \
+ _(HIP) \
+ _(SHIM6)
+
+always_inline u8
+ip6_ext_hdr (u8 nexthdr)
{
+#ifdef CLIB_HAVE_VEC128
+ static const u8x16 ext_hdr_types = {
+#define _(x) IP_PROTOCOL_##x,
+ foreach_ext_hdr_type
+#undef _
+ };
+
+ return !u8x16_is_all_zero (ext_hdr_types == u8x16_splat (nexthdr));
+#else
/*
* find out if nexthdr is an extension header or a protocol
*/
- return (nexthdr == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS) ||
- (nexthdr == IP_PROTOCOL_IPV6_FRAGMENTATION) ||
- (nexthdr == IP_PROTOCOL_IPSEC_AH) ||
- (nexthdr == IP_PROTOCOL_IPV6_ROUTE) ||
- (nexthdr == IP_PROTOCOL_IP6_DESTINATION_OPTIONS);
-}
-
-#define ip6_ext_header_len(p) ((((ip6_ext_header_t *)(p))->n_data_u64s+1) << 3)
-#define ip6_ext_authhdr_len(p) ((((ip6_ext_header_t *)(p))->n_data_u64s+2) << 2)
-
-always_inline void *
-ip6_ext_next_header (ip6_ext_header_t *ext_hdr )
-{ return (void *)((u8 *) ext_hdr + ip6_ext_header_len(ext_hdr)); }
-
-/*
- * Macro to find the IPv6 ext header of type t
- * I is the IPv6 header
- * P is the previous IPv6 ext header (NULL if none)
- * M is the matched IPv6 ext header of type t
- */
-#define ip6_ext_header_find_t(i, p, m, t) \
-if ((i)->protocol == t) \
-{ \
- (m) = (void *)((i)+1); \
- (p) = NULL; \
-} \
-else \
-{ \
- (m) = NULL; \
- (p) = (void *)((i)+1); \
- while (ip6_ext_hdr((p)->next_hdr) && \
- ((ip6_ext_header_t *)(p))->next_hdr != (t)) \
- { \
- (p) = ip6_ext_next_header((p)); \
- } \
- if ( ip6_ext_hdr((p)->next_hdr) == (t)) \
- { \
- (m) = (void *)(ip6_ext_next_header((p))); \
- } \
+ return 0
+#define _(x) || (nexthdr == IP_PROTOCOL_##x)
+ foreach_ext_hdr_type;
+#undef _
+#endif
}
-
typedef CLIB_PACKED (struct {
u8 next_hdr;
/* Length of this header plus option data in 8 byte units. */
u8 n_data_u64s;
u8 data[0];
}) ip6_hop_by_hop_ext_t;
-/* *INDENT-ON* */
-/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
u8 next_hdr;
u8 rsv;
u16 fragment_offset_and_more;
u32 identification;
}) ip6_frag_hdr_t;
-/* *INDENT-ON* */
-#define ip6_frag_hdr_offset(hdr) \
- (clib_net_to_host_u16((hdr)->fragment_offset_and_more) >> 3)
+#define ip6_frag_hdr_offset(hdr) \
+ (clib_net_to_host_u16 ((hdr)->fragment_offset_and_more) >> 3)
+
+#define ip6_frag_hdr_offset_bytes(hdr) (8 * ip6_frag_hdr_offset (hdr))
+
+#define ip6_frag_hdr_more(hdr) \
+ (clib_net_to_host_u16 ((hdr)->fragment_offset_and_more) & 0x1)
+
+#define ip6_frag_hdr_offset_and_more(offset, more) \
+ clib_host_to_net_u16 (((offset) << 3) + !!(more))
-#define ip6_frag_hdr_more(hdr) \
- (clib_net_to_host_u16((hdr)->fragment_offset_and_more) & 0x1)
+#define ip6_ext_header_len(p) ((((ip6_ext_header_t *)(p))->n_data_u64s+1) << 3)
+#define ip6_ext_authhdr_len(p) ((((ip6_ext_header_t *)(p))->n_data_u64s+2) << 2)
+
+static inline int
+ip6_ext_header_len_s (ip_protocol_t nh, void *p)
+{
+ if (ip6_ext_hdr (nh))
+ return ip6_ext_header_len (p);
+ switch (nh)
+ {
+ case IP_PROTOCOL_IPSEC_AH:
+ return ip6_ext_authhdr_len (p);
+ case IP_PROTOCOL_IPV6_FRAGMENTATION:
+ return sizeof (ip6_frag_hdr_t);
+ case IP_PROTOCOL_ICMP6:
+ return 4;
+ case IP_PROTOCOL_UDP:
+ return 8;
+ case IP_PROTOCOL_TCP:
+ return 20;
+ default: /* Caller is responsible for validating the length of terminating
+ protocols */
+ ;
+ }
+ return 0;
+}
+
+always_inline void *
+ip6_ext_next_header (ip6_ext_header_t * ext_hdr)
+{
+ return (void *) ((u8 *) ext_hdr + ip6_ext_header_len (ext_hdr));
+}
+
+always_inline void *
+ip6_ext_next_header_offset (void *hdr, u16 offset)
+{
+ return (hdr + offset);
+}
-#define ip6_frag_hdr_offset_and_more(offset, more) \
- clib_host_to_net_u16(((offset) << 3) + !!(more))
+always_inline int
+vlib_object_within_buffer_data (vlib_main_t * vm, vlib_buffer_t * b,
+ void *obj, size_t len)
+{
+ u8 *o = obj;
+ if (o < b->data ||
+ o + len > b->data + vlib_buffer_get_default_data_size (vm))
+ return 0;
+ return 1;
+}
+
+/* Returns the number of bytes left in buffer from p. */
+static inline u32
+vlib_bytes_left_in_buffer (vlib_buffer_t *b, void *obj)
+{
+ return b->current_length - (((u8 *) obj - b->data) - b->current_data);
+}
+
+always_inline void *
+ip6_ext_next_header_s (ip_protocol_t cur_nh, void *hdr, u32 max_offset,
+ u32 *offset, int *res_nh, bool *last)
+{
+ u16 hdrlen = 0;
+ int new_nh = -1;
+ void *res = 0;
+ if (ip6_ext_hdr (cur_nh))
+ {
+ hdrlen = ip6_ext_header_len (hdr);
+ new_nh = ((ip6_ext_header_t *) hdr)->next_hdr;
+ res = hdr + hdrlen;
+ }
+ else if (cur_nh == IP_PROTOCOL_IPV6_FRAGMENTATION)
+ {
+ ip6_frag_hdr_t *frag_hdr = (ip6_frag_hdr_t *) hdr;
+ if (ip6_frag_hdr_offset (frag_hdr) > 0)
+ *last = true;
+ new_nh = frag_hdr->next_hdr;
+ hdrlen = sizeof (ip6_frag_hdr_t);
+ res = hdr + hdrlen;
+ }
+ else if (cur_nh == IP_PROTOCOL_IPSEC_AH)
+ {
+ new_nh = ((ip6_ext_header_t *) hdr)->next_hdr;
+ hdrlen = ip6_ext_authhdr_len (hdr);
+ res = hdr + hdrlen;
+ }
+ else
+ {
+ ;
+ }
+
+ if (res && (*offset + hdrlen) >= max_offset)
+ {
+ return 0;
+ }
+ *res_nh = new_nh;
+ *offset += hdrlen;
+ return res;
+}
+
+#define IP6_EXT_HDR_MAX (4) /* Maximum number of headers */
+#define IP6_EXT_HDR_MAX_DEPTH (256) /* Maximum header depth */
+typedef struct
+{
+ int length;
+ struct
+ {
+ u16 protocol;
+ u16 offset;
+ } eh[IP6_EXT_HDR_MAX];
+} ip6_ext_hdr_chain_t;
+
+/*
+ * Find ipv6 extension header within ipv6 header within
+ * whichever is smallest of buffer or IP6_EXT_HDR_MAX_DEPTH.
+ * The complete header chain must be in first buffer.
+ *
+ * The complete header chain (up to the terminating header) is
+ * returned in res.
+ * Returns the index of the find_hdr_type if > 0. Otherwise
+ * it returns the index of the last header.
+ */
+always_inline int
+ip6_ext_header_walk (vlib_buffer_t *b, ip6_header_t *ip, int find_hdr_type,
+ ip6_ext_hdr_chain_t *res)
+{
+ int i = 0;
+ int found = -1;
+ void *next_header = ip6_next_header (ip);
+ int next_proto = ip->protocol;
+ res->length = 0;
+ u32 n_bytes_this_buffer =
+ clib_min (vlib_bytes_left_in_buffer (b, ip), IP6_EXT_HDR_MAX_DEPTH);
+ u32 max_offset = clib_min (n_bytes_this_buffer,
+ sizeof (ip6_header_t) +
+ clib_net_to_host_u16 (ip->payload_length));
+ u32 offset = sizeof (ip6_header_t);
+ if ((ip6_ext_header_len_s (ip->protocol, next_header) + offset) > max_offset)
+ {
+ return -1;
+ }
+ bool last = false;
+ while (next_header)
+ {
+ /* Move on to next header */
+ res->eh[i].offset = offset;
+ res->eh[i].protocol = next_proto;
+ if (next_proto == find_hdr_type)
+ found = i;
+ i++;
+ if (last)
+ break;
+ if (i >= IP6_EXT_HDR_MAX)
+ break;
+ next_header = ip6_ext_next_header_s (next_proto, next_header, max_offset,
+ &offset, &next_proto, &last);
+ }
+ res->length = i;
+ if (find_hdr_type < 0)
+ return i - 1;
+ return found != -1 ? found : i - 1;
+}
+
+always_inline void *
+ip6_ext_header_find (vlib_main_t *vm, vlib_buffer_t *b, ip6_header_t *ip,
+ int find_hdr_type, ip6_ext_header_t **prev_ext_header)
+{
+ ip6_ext_hdr_chain_t hdr_chain;
+ int res = ip6_ext_header_walk (b, ip, find_hdr_type, &hdr_chain);
+ if (res < 0)
+ return 0;
+
+ if (prev_ext_header)
+ {
+ if (res > 0)
+ {
+ *prev_ext_header =
+ ip6_ext_next_header_offset (ip, hdr_chain.eh[res - 1].offset);
+ }
+ else
+ {
+ *prev_ext_header = 0;
+ }
+ }
+ if (find_hdr_type == hdr_chain.eh[res].protocol)
+ return ip6_ext_next_header_offset (ip, hdr_chain.eh[res].offset);
+ return 0;
+}
#endif /* included_ip6_packet_h */
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