/* * Copyright (c) 2015 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * ip6/packet.h: ip6 packet format * * Copyright (c) 2008 Eliot Dresselhaus * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifndef included_ip6_packet_h #define included_ip6_packet_h #include <vnet/tcp/tcp_packet.h> #include <vnet/ip/ip4_packet.h> typedef union { u8 as_u8[16]; u16 as_u16[8]; u32 as_u32[4]; u64 as_u64[2]; uword as_uword[16 / sizeof (uword)]; } ip6_address_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 ip46_address_t to_ip46 (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); return ip; } always_inline void ip6_addr_fib_init (ip6_address_fib_t * addr_fib, ip6_address_t * address, u32 fib_index) { addr_fib->ip6_addr = *address; addr_fib->fib_index = fib_index; } /* Special addresses: unspecified ::/128 loopback ::1/128 global unicast 2000::/3 unique local unicast fc00::/7 link local unicast fe80::/10 multicast ff00::/8 ietf reserved everything else. */ #define foreach_ip6_multicast_address_scope \ _ (loopback, 0x1) \ _ (link_local, 0x2) \ _ (admin_local, 0x4) \ _ (site_local, 0x5) \ _ (organization_local, 0x8) \ _ (global, 0xe) #define foreach_ip6_multicast_link_local_group_id \ _ (all_hosts, 0x1) \ _ (all_routers, 0x2) \ _ (rip_routers, 0x9) \ _ (eigrp_routers, 0xa) \ _ (pim_routers, 0xd) \ _ (mldv2_routers, 0x16) typedef enum { #define _(f,n) IP6_MULTICAST_SCOPE_##f = n, foreach_ip6_multicast_address_scope #undef _ } ip6_multicast_address_scope_t; typedef enum { #define _(f,n) IP6_MULTICAST_GROUP_ID_##f = n, foreach_ip6_multicast_link_local_group_id #undef _ } ip6_multicast_link_local_group_id_t; always_inline uword ip6_address_is_multicast (ip6_address_t * a) { return a->as_u8[0] == 0xff; } always_inline uword ip46_address_is_multicast (ip46_address_t * a) { return ip46_address_is_ip4 (a) ? ip4_address_is_multicast (&a->ip4) : ip6_address_is_multicast (&a->ip6); } always_inline void ip6_set_reserved_multicast_address (ip6_address_t * a, ip6_multicast_address_scope_t scope, u16 id) { a->as_u64[0] = a->as_u64[1] = 0; a->as_u16[0] = clib_host_to_net_u16 (0xff00 | scope); a->as_u16[7] = clib_host_to_net_u16 (id); } always_inline void ip6_set_solicited_node_multicast_address (ip6_address_t * a, u32 id) { /* 0xff02::1:ffXX:XXXX. */ a->as_u64[0] = a->as_u64[1] = 0; a->as_u16[0] = clib_host_to_net_u16 (0xff02); a->as_u8[11] = 1; ASSERT ((id >> 24) == 0); id |= 0xff << 24; 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) { ethernet_address[0] = 0x33; ethernet_address[1] = 0x33; ethernet_address[2] = ((group_id >> 24) & 0xff); ethernet_address[3] = ((group_id >> 16) & 0xff); ethernet_address[4] = ((group_id >> 8) & 0xff); ethernet_address[5] = ((group_id >> 0) & 0xff); } always_inline uword ip6_address_is_equal (ip6_address_t * a, ip6_address_t * b) { int i; for (i = 0; i < ARRAY_LEN (a->as_uword); i++) if (a->as_uword[i] != b->as_uword[i]) return 0; return 1; } always_inline uword ip6_address_is_equal_masked (ip6_address_t * a, ip6_address_t * b, ip6_address_t * mask) { int i; for (i = 0; i < ARRAY_LEN (a->as_uword); i++) { uword a_masked, b_masked; a_masked = a->as_uword[i] & mask->as_uword[i]; b_masked = b->as_uword[i] & mask->as_uword[i]; if (a_masked != b_masked) return 0; } return 1; } always_inline void ip6_address_mask (ip6_address_t * a, ip6_address_t * mask) { int i; for (i = 0; i < ARRAY_LEN (a->as_uword); i++) a->as_uword[i] &= mask->as_uword[i]; } always_inline void ip6_address_set_zero (ip6_address_t * a) { int i; for (i = 0; i < ARRAY_LEN (a->as_uword); i++) a->as_uword[i] = 0; } always_inline void 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])); for (i = 0; i < width; i++) { bitnum = (7 - (i & 7)); byte = i / 8; bit = 1 << bitnum; a->as_u8[byte] |= bit; } } always_inline uword ip6_address_is_zero (ip6_address_t * a) { int i; for (i = 0; i < ARRAY_LEN (a->as_uword); i++) if (a->as_uword[i] != 0) return 0; return 1; } /* Check for unspecified address ::0 */ always_inline uword ip6_address_is_unspecified (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) { 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; } /* Check for link local unicast fe80::/10. */ always_inline uword ip6_address_is_link_local_unicast (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) { 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) { 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) { return (a->as_u32[0] == clib_host_to_net_u32 (0xff020000) && a->as_u32[1] == 0 && a->as_u32[2] == clib_host_to_net_u32 (1) && a->as_u8[12] == 0xff); } typedef struct { /* 4 bit version, 8 bit traffic class and 20 bit flow label. */ u32 ip_version_traffic_class_and_flow_label; /* Total packet length not including this header (but including any extension headers if present). */ u16 payload_length; /* Protocol for next header. */ u8 protocol; /* Hop limit decremented by router at each hop. */ u8 hop_limit; /* Source and destination address. */ ip6_address_t src_address, dst_address; } ip6_header_t; always_inline u8 ip6_traffic_class (ip6_header_t * i) { return (i->ip_version_traffic_class_and_flow_label & 0x0FF00000) >> 20; } always_inline void * ip6_next_header (ip6_header_t * i) { return (void *) (i + 1); } always_inline void ip6_copy_header (ip6_header_t * dst, const ip6_header_t * src) { dst->ip_version_traffic_class_and_flow_label = src->ip_version_traffic_class_and_flow_label; dst->payload_length = src->payload_length; dst->protocol = src->protocol; dst->hop_limit = src->hop_limit; dst->src_address.as_uword[0] = src->src_address.as_uword[0]; dst->src_address.as_uword[1] = src->src_address.as_uword[1]; dst->dst_address.as_uword[0] = src->dst_address.as_uword[0]; 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 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) { /* * 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 ( ((p)->next_hdr) == (t)) \ { \ (m) = (void *)(ip6_ext_next_header((p))); \ } \ } 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_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)) #endif /* included_ip6_packet_h */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */