X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fip%2Fip6_packet.h;h=c506792ddcf76e36db3d1d00e629b93d5d130784;hb=2f4586d9b3507243918c11ce99b9d151d5bde7a0;hp=1e551c8b67d0805c9eb8f3cd231fc62fb1c604f7;hpb=7cd468a3d7dee7d6c92f69a0bb7061ae208ec727;p=vpp.git diff --git a/src/vnet/ip/ip6_packet.h b/src/vnet/ip/ip6_packet.h index 1e551c8b67d..c506792ddcf 100644 --- a/src/vnet/ip/ip6_packet.h +++ b/src/vnet/ip/ip6_packet.h @@ -40,8 +40,9 @@ #ifndef included_ip6_packet_h #define included_ip6_packet_h -#include +#include #include +#include typedef union { @@ -49,52 +50,30 @@ 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)) always_inline void -ip46_from_addr_buf (u32 is_ipv6, u8 * buf, ip46_address_t * ip) +ip6_addr_fib_init (ip6_address_fib_t * addr_fib, + const ip6_address_t * address, u32 fib_index) { - 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) -{ - 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; } @@ -138,16 +117,16 @@ typedef enum } 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 @@ -172,23 +151,6 @@ ip6_set_solicited_node_multicast_address (ip6_address_t * a, u32 id) 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) { @@ -201,7 +163,7 @@ 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++) @@ -211,8 +173,9 @@ ip6_address_is_equal (ip6_address_t * a, ip6_address_t * b) } 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++) @@ -228,7 +191,7 @@ ip6_address_is_equal_masked (ip6_address_t * a, ip6_address_t * b, } 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++) @@ -248,7 +211,7 @@ ip6_address_mask_from_width (ip6_address_t * a, u32 width) { 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)); @@ -259,7 +222,7 @@ ip6_address_mask_from_width (ip6_address_t * a, u32 width) } 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++) @@ -270,47 +233,44 @@ ip6_address_is_zero (ip6_address_t * a) /* 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 @@ -318,6 +278,18 @@ ip6_is_solicited_node_multicast_address (ip6_address_t * a) && 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. */ @@ -337,6 +309,99 @@ typedef struct 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) { @@ -358,135 +423,278 @@ ip6_copy_header (ip6_header_t * dst, const ip6_header_t * src) 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->ports.src; - dst0 = tcp0->ports.dst; - tcp0->ports.src = dst0; - tcp0->ports.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->ports.src; - src1 = tcp1->ports.src; - dst0 = tcp0->ports.dst; - dst1 = tcp1->ports.dst; - tcp0->ports.src = dst0; - tcp1->ports.src = dst1; - tcp0->ports.dst = src0; - tcp1->ports.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_IP6_NONXT) || - (nexthdr == IP_PROTOCOL_IPV6_FRAGMENTATION) || - (nexthdr == IP_PROTOCOL_IPSEC_AH) || - (nexthdr == IP_PROTOCOL_IPV6_ROUTE) || - (nexthdr == IP_PROTOCOL_IP6_DESTINATION_OPTIONS); + return 0 +#define _(x) || (nexthdr == IP_PROTOCOL_##x) + foreach_ext_hdr_type; +#undef _ +#endif } -#define ip6_ext_header_len(p) (((p)->n_data_u64s+1) << 3) -#define ip6_ext_authhdr_len(p) (((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)); } - 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_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); +} + +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 + { + ; + } -#define ip6_frag_hdr_more(hdr) \ - (clib_net_to_host_u16((hdr)->fragment_offset_and_more) & 0x1) + if (res && (*offset + hdrlen) >= max_offset) + { + return 0; + } + *res_nh = new_nh; + *offset += hdrlen; + return res; +} -#define ip6_frag_hdr_offset_and_more(offset, more) \ - clib_host_to_net_u16(((offset) << 3) + !!(more)) +#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 */