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Diffstat (limited to 'src/vnet/map/map.h')
| -rw-r--r-- | src/vnet/map/map.h | 591 |
1 files changed, 591 insertions, 0 deletions
diff --git a/src/vnet/map/map.h b/src/vnet/map/map.h new file mode 100644 index 00000000000..f446b739a93 --- /dev/null +++ b/src/vnet/map/map.h @@ -0,0 +1,591 @@ +/* + * 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. + */ +#include <stdbool.h> +#include <vppinfra/error.h> +#include <vnet/vnet.h> +#include <vnet/ip/ip.h> +#include <vlib/vlib.h> +#include <vnet/fib/fib_types.h> +#include <vnet/fib/ip4_fib.h> +#include <vnet/adj/adj.h> +#include <vnet/map/map_dpo.h> +#include <vnet/dpo/load_balance.h> + +#define MAP_SKIP_IP6_LOOKUP 1 + +typedef enum +{ + MAP_SENDER, + MAP_RECEIVER +} map_dir_e; + +int map_create_domain (ip4_address_t * ip4_prefix, u8 ip4_prefix_len, + ip6_address_t * ip6_prefix, u8 ip6_prefix_len, + ip6_address_t * ip6_src, u8 ip6_src_len, + u8 ea_bits_len, u8 psid_offset, u8 psid_length, + u32 * map_domain_index, u16 mtu, u8 flags); +int map_delete_domain (u32 map_domain_index); +int map_add_del_psid (u32 map_domain_index, u16 psid, ip6_address_t * tep, + u8 is_add); +u8 *format_map_trace (u8 * s, va_list * args); +i32 ip4_get_port (ip4_header_t * ip, map_dir_e dir, u16 buffer_len); +i32 ip6_get_port (ip6_header_t * ip6, map_dir_e dir, u16 buffer_len); +u16 ip4_map_get_port (ip4_header_t * ip, map_dir_e dir); + +typedef enum __attribute__ ((__packed__)) +{ + MAP_DOMAIN_PREFIX = 1 << 0, MAP_DOMAIN_TRANSLATION = 1 << 1, // The domain uses MAP-T +} map_domain_flags_e; + +/** + * IP4 reassembly logic: + * One virtually reassembled flow requires a map_ip4_reass_t structure in order + * to keep the first-fragment port number and, optionally, cache out of sequence + * packets. + * There are up to MAP_IP4_REASS_MAX_REASSEMBLY such structures. + * When in use, those structures are stored in a hash table of MAP_IP4_REASS_BUCKETS buckets. + * When a new structure needs to be used, it is allocated from available ones. + * If there is no structure available, the oldest in use is selected and used if and + * only if it was first allocated more than MAP_IP4_REASS_LIFETIME seconds ago. + * In case no structure can be allocated, the fragment is dropped. + */ + +#define MAP_IP4_REASS_LIFETIME_DEFAULT (100) /* ms */ +#define MAP_IP4_REASS_HT_RATIO_DEFAULT (1.0) +#define MAP_IP4_REASS_POOL_SIZE_DEFAULT 1024 // Number of reassembly structures +#define MAP_IP4_REASS_BUFFERS_DEFAULT 2048 + +#define MAP_IP4_REASS_MAX_FRAGMENTS_PER_REASSEMBLY 5 // Number of fragment per reassembly + +#define MAP_IP6_REASS_LIFETIME_DEFAULT (100) /* ms */ +#define MAP_IP6_REASS_HT_RATIO_DEFAULT (1.0) +#define MAP_IP6_REASS_POOL_SIZE_DEFAULT 1024 // Number of reassembly structures +#define MAP_IP6_REASS_BUFFERS_DEFAULT 2048 + +#define MAP_IP6_REASS_MAX_FRAGMENTS_PER_REASSEMBLY 5 + +#define MAP_IP6_REASS_COUNT_BYTES +#define MAP_IP4_REASS_COUNT_BYTES + +//#define IP6_MAP_T_OVERRIDE_TOS 0 + +/* + * This structure _MUST_ be no larger than a single cache line (64 bytes). + * If more space is needed make a union of ip6_prefix and *rules, those are mutually exclusive. + */ +typedef struct +{ + ip6_address_t ip6_src; + ip6_address_t ip6_prefix; + ip6_address_t *rules; + u32 suffix_mask; + ip4_address_t ip4_prefix; + u16 psid_mask; + u16 mtu; + map_domain_flags_e flags; + u8 ip6_prefix_len; + u8 ip6_src_len; + u8 ea_bits_len; + u8 psid_offset; + u8 psid_length; + + /* helpers */ + u8 psid_shift; + u8 suffix_shift; + u8 ea_shift; + + /* not used by forwarding */ + u8 ip4_prefix_len; +} map_domain_t; + +STATIC_ASSERT ((sizeof (map_domain_t) <= CLIB_CACHE_LINE_BYTES), + "MAP domain fits in one cacheline"); + +#define MAP_REASS_INDEX_NONE ((u16)0xffff) + +/* + * Hash key, padded out to 16 bytes for fast compare + */ +/* *INDENT-OFF* */ +typedef union { + CLIB_PACKED (struct { + ip4_address_t src; + ip4_address_t dst; + u16 fragment_id; + u8 protocol; + }); + u64 as_u64[2]; + u32 as_u32[4]; +} map_ip4_reass_key_t; +/* *INDENT-ON* */ + +typedef struct +{ + map_ip4_reass_key_t key; + f64 ts; +#ifdef MAP_IP4_REASS_COUNT_BYTES + u16 expected_total; + u16 forwarded; +#endif + i32 port; + u16 bucket; + u16 bucket_next; + u16 fifo_prev; + u16 fifo_next; + u32 fragments[MAP_IP4_REASS_MAX_FRAGMENTS_PER_REASSEMBLY]; +} map_ip4_reass_t; + +/* + * MAP domain counters + */ +typedef enum +{ + /* Simple counters */ + MAP_DOMAIN_IPV4_FRAGMENT = 0, + /* Combined counters */ + MAP_DOMAIN_COUNTER_RX = 0, + MAP_DOMAIN_COUNTER_TX, + MAP_N_DOMAIN_COUNTER +} map_domain_counter_t; + +/* + * main_main_t + */ +/* *INDENT-OFF* */ +typedef union { + CLIB_PACKED (struct { + ip6_address_t src; + ip6_address_t dst; + u32 fragment_id; + u8 protocol; + }); + u64 as_u64[5]; + u32 as_u32[10]; +} map_ip6_reass_key_t; +/* *INDENT-OFF* */ + +typedef struct { + u32 pi; //Cached packet or ~0 + u16 next_data_offset; //The data offset of the additional 20 bytes or ~0 + u8 next_data_len; //Number of bytes ready to be copied (20 if not last fragment) + u8 next_data[20]; //The 20 additional bytes +} map_ip6_fragment_t; + +typedef struct { + map_ip6_reass_key_t key; + f64 ts; +#ifdef MAP_IP6_REASS_COUNT_BYTES + u16 expected_total; + u16 forwarded; +#endif + u16 bucket; //What hash bucket this element is linked in + u16 bucket_next; + u16 fifo_prev; + u16 fifo_next; + ip4_header_t ip4_header; + map_ip6_fragment_t fragments[MAP_IP6_REASS_MAX_FRAGMENTS_PER_REASSEMBLY]; +} map_ip6_reass_t; + +typedef struct { + /* pool of MAP domains */ + map_domain_t *domains; + + /* MAP Domain packet/byte counters indexed by map domain index */ + vlib_simple_counter_main_t *simple_domain_counters; + vlib_combined_counter_main_t *domain_counters; + volatile u32 *counter_lock; + +#ifdef MAP_SKIP_IP6_LOOKUP + /* pre-presolve */ + u32 adj6_index, adj4_index; + ip4_address_t preresolve_ip4; + ip6_address_t preresolve_ip6; +#endif + + /* Traffic class: zero, copy (~0) or fixed value */ + u8 tc; + bool tc_copy; + + bool sec_check; /* Inbound security check */ + bool sec_check_frag; /* Inbound security check for (subsequent) fragments */ + bool icmp6_enabled; /* Send destination unreachable for security check failure */ + + /* ICMPv6 -> ICMPv4 relay parameters */ + ip4_address_t icmp4_src_address; + vlib_simple_counter_main_t icmp_relayed; + + /* convenience */ + vlib_main_t *vlib_main; + vnet_main_t *vnet_main; + + /* + * IPv4 encap and decap reassembly + */ + /* Configuration */ + f32 ip4_reass_conf_ht_ratio; //Size of ht is 2^ceil(log2(ratio*pool_size)) + u16 ip4_reass_conf_pool_size; //Max number of allocated reass structures + u16 ip4_reass_conf_lifetime_ms; //Time a reassembly struct is considered valid in ms + u32 ip4_reass_conf_buffers; //Maximum number of buffers used by ip4 reassembly + + /* Runtime */ + map_ip4_reass_t *ip4_reass_pool; + u8 ip4_reass_ht_log2len; //Hash table size is 2^log2len + u16 ip4_reass_allocated; + u16 *ip4_reass_hash_table; + u16 ip4_reass_fifo_last; + volatile u32 *ip4_reass_lock; + + /* Counters */ + u32 ip4_reass_buffered_counter; + + bool frag_inner; /* Inner or outer fragmentation */ + bool frag_ignore_df; /* Fragment (outer) packet even if DF is set */ + + /* + * IPv6 decap reassembly + */ + /* Configuration */ + f32 ip6_reass_conf_ht_ratio; //Size of ht is 2^ceil(log2(ratio*pool_size)) + u16 ip6_reass_conf_pool_size; //Max number of allocated reass structures + u16 ip6_reass_conf_lifetime_ms; //Time a reassembly struct is considered valid in ms + u32 ip6_reass_conf_buffers; //Maximum number of buffers used by ip6 reassembly + + /* Runtime */ + map_ip6_reass_t *ip6_reass_pool; + u8 ip6_reass_ht_log2len; //Hash table size is 2^log2len + u16 ip6_reass_allocated; + u16 *ip6_reass_hash_table; + u16 ip6_reass_fifo_last; + volatile u32 *ip6_reass_lock; + + /* Counters */ + u32 ip6_reass_buffered_counter; + +} map_main_t; + +/* + * MAP Error counters/messages + */ +#define foreach_map_error \ + /* Must be first. */ \ + _(NONE, "valid MAP packets") \ + _(BAD_PROTOCOL, "bad protocol") \ + _(SEC_CHECK, "security check failed") \ + _(ENCAP_SEC_CHECK, "encap security check failed") \ + _(DECAP_SEC_CHECK, "decap security check failed") \ + _(ICMP, "unable to translate ICMP") \ + _(ICMP_RELAY, "unable to relay ICMP") \ + _(UNKNOWN, "unknown") \ + _(NO_BINDING, "no binding") \ + _(NO_DOMAIN, "no domain") \ + _(FRAGMENTED, "packet is a fragment") \ + _(FRAGMENT_MEMORY, "could not cache fragment") \ + _(FRAGMENT_MALFORMED, "fragment has unexpected format")\ + _(FRAGMENT_DROPPED, "dropped cached fragment") \ + _(MALFORMED, "malformed packet") \ + _(DF_SET, "can't fragment, DF set") + +typedef enum { +#define _(sym,str) MAP_ERROR_##sym, + foreach_map_error +#undef _ + MAP_N_ERROR, + } map_error_t; + +u64 map_error_counter_get(u32 node_index, map_error_t map_error); + +typedef struct { + u32 map_domain_index; + u16 port; +} map_trace_t; + +map_main_t map_main; + +extern vlib_node_registration_t ip4_map_node; +extern vlib_node_registration_t ip6_map_node; + +extern vlib_node_registration_t ip4_map_t_node; +extern vlib_node_registration_t ip4_map_t_fragmented_node; +extern vlib_node_registration_t ip4_map_t_tcp_udp_node; +extern vlib_node_registration_t ip4_map_t_icmp_node; + +extern vlib_node_registration_t ip6_map_t_node; +extern vlib_node_registration_t ip6_map_t_fragmented_node; +extern vlib_node_registration_t ip6_map_t_tcp_udp_node; +extern vlib_node_registration_t ip6_map_t_icmp_node; + +/* + * map_get_pfx + */ +static_always_inline u64 +map_get_pfx (map_domain_t *d, u32 addr, u16 port) +{ + u16 psid = (port >> d->psid_shift) & d->psid_mask; + + if (d->ea_bits_len == 0 && d->rules) + return clib_net_to_host_u64(d->rules[psid].as_u64[0]); + + u32 suffix = (addr >> d->suffix_shift) & d->suffix_mask; + u64 ea = d->ea_bits_len == 0 ? 0 : (((u64) suffix << d->psid_length)) | psid; + + return clib_net_to_host_u64(d->ip6_prefix.as_u64[0]) | ea << d->ea_shift; +} + +static_always_inline u64 +map_get_pfx_net (map_domain_t *d, u32 addr, u16 port) +{ + return clib_host_to_net_u64(map_get_pfx(d, clib_net_to_host_u32(addr), + clib_net_to_host_u16(port))); +} + +/* + * map_get_sfx + */ +static_always_inline u64 +map_get_sfx (map_domain_t *d, u32 addr, u16 port) +{ + u16 psid = (port >> d->psid_shift) & d->psid_mask; + + /* Shared 1:1 mode. */ + if (d->ea_bits_len == 0 && d->rules) + return clib_net_to_host_u64(d->rules[psid].as_u64[1]); + if (d->ip6_prefix_len == 128) + return clib_net_to_host_u64(d->ip6_prefix.as_u64[1]); + + /* IPv4 prefix */ + if (d->flags & MAP_DOMAIN_PREFIX) + return (u64) (addr & (0xFFFFFFFF << d->suffix_shift)) << 16; + + /* Shared or full IPv4 address */ + return ((u64) addr << 16) | psid; +} + +static_always_inline u64 +map_get_sfx_net (map_domain_t *d, u32 addr, u16 port) +{ + return clib_host_to_net_u64(map_get_sfx(d, clib_net_to_host_u32(addr), + clib_net_to_host_u16(port))); +} + +static_always_inline u32 +map_get_ip4 (ip6_address_t *addr) +{ + return clib_host_to_net_u32(clib_net_to_host_u64(addr->as_u64[1]) >> 16); +} + +/* + * Get the MAP domain from an IPv4 lookup adjacency. + */ +static_always_inline map_domain_t * +ip4_map_get_domain (u32 mdi, + u32 *map_domain_index) +{ + map_main_t *mm = &map_main; + map_dpo_t *md; + + md = map_dpo_get(mdi); + + ASSERT(md); + *map_domain_index = md->md_domain; + return pool_elt_at_index(mm->domains, *map_domain_index); +} + +/* + * Get the MAP domain from an IPv6 lookup adjacency. + * If the IPv6 address or prefix is not shared, no lookup is required. + * The IPv4 address is used otherwise. + */ +static_always_inline map_domain_t * +ip6_map_get_domain (u32 mdi, ip4_address_t *addr, + u32 *map_domain_index, u8 *error) +{ + map_main_t *mm = &map_main; + map_dpo_t *md; + + /* + * Disable direct MAP domain lookup on decap, until the security check is updated to verify IPv4 SA. + * (That's done implicitly when MAP domain is looked up in the IPv4 FIB) + */ +#ifdef MAP_NONSHARED_DOMAIN_ENABLED + md = map_dpo_get(mdi); + + ASSERT(md); + *map_domain_index = md->md_domain; + if (*map_domain_index != ~0) + return pool_elt_at_index(mm->domains, *map_domain_index); +#endif + + u32 lbi = ip4_fib_forwarding_lookup(0, addr); + const dpo_id_t *dpo = load_balance_get_bucket(lbi, 0); + if (PREDICT_TRUE(dpo->dpoi_type == map_dpo_type || + dpo->dpoi_type == map_t_dpo_type)) + { + md = map_dpo_get(dpo->dpoi_index); + *map_domain_index = md->md_domain; + return pool_elt_at_index(mm->domains, *map_domain_index); + } + *error = MAP_ERROR_NO_DOMAIN; + return NULL; +} + +map_ip4_reass_t * +map_ip4_reass_get(u32 src, u32 dst, u16 fragment_id, + u8 protocol, u32 **pi_to_drop); +void +map_ip4_reass_free(map_ip4_reass_t *r, u32 **pi_to_drop); + +#define map_ip4_reass_lock() while (__sync_lock_test_and_set(map_main.ip4_reass_lock, 1)) {} +#define map_ip4_reass_unlock() do {CLIB_MEMORY_BARRIER(); *map_main.ip4_reass_lock = 0;} while(0) + +static_always_inline void +map_ip4_reass_get_fragments(map_ip4_reass_t *r, u32 **pi) +{ + int i; + for (i=0; i<MAP_IP4_REASS_MAX_FRAGMENTS_PER_REASSEMBLY; i++) + if(r->fragments[i] != ~0) { + vec_add1(*pi, r->fragments[i]); + r->fragments[i] = ~0; + map_main.ip4_reass_buffered_counter--; + } +} + +int map_ip4_reass_add_fragment(map_ip4_reass_t *r, u32 pi); + +map_ip6_reass_t * +map_ip6_reass_get(ip6_address_t *src, ip6_address_t *dst, u32 fragment_id, + u8 protocol, u32 **pi_to_drop); +void +map_ip6_reass_free(map_ip6_reass_t *r, u32 **pi_to_drop); + +#define map_ip6_reass_lock() while (__sync_lock_test_and_set(map_main.ip6_reass_lock, 1)) {} +#define map_ip6_reass_unlock() do {CLIB_MEMORY_BARRIER(); *map_main.ip6_reass_lock = 0;} while(0) + +int +map_ip6_reass_add_fragment(map_ip6_reass_t *r, u32 pi, + u16 data_offset, u16 next_data_offset, + u8 *data_start, u16 data_len); + +void map_ip4_drop_pi(u32 pi); + +int map_ip4_reass_conf_ht_ratio(f32 ht_ratio, u32 *trashed_reass, u32 *dropped_packets); +#define MAP_IP4_REASS_CONF_HT_RATIO_MAX 100 +int map_ip4_reass_conf_pool_size(u16 pool_size, u32 *trashed_reass, u32 *dropped_packets); +#define MAP_IP4_REASS_CONF_POOL_SIZE_MAX (0xfeff) +int map_ip4_reass_conf_lifetime(u16 lifetime_ms); +#define MAP_IP4_REASS_CONF_LIFETIME_MAX 0xffff +int map_ip4_reass_conf_buffers(u32 buffers); +#define MAP_IP4_REASS_CONF_BUFFERS_MAX (0xffffffff) + +void map_ip6_drop_pi(u32 pi); + + +int map_ip6_reass_conf_ht_ratio(f32 ht_ratio, u32 *trashed_reass, u32 *dropped_packets); +#define MAP_IP6_REASS_CONF_HT_RATIO_MAX 100 +int map_ip6_reass_conf_pool_size(u16 pool_size, u32 *trashed_reass, u32 *dropped_packets); +#define MAP_IP6_REASS_CONF_POOL_SIZE_MAX (0xfeff) +int map_ip6_reass_conf_lifetime(u16 lifetime_ms); +#define MAP_IP6_REASS_CONF_LIFETIME_MAX 0xffff +int map_ip6_reass_conf_buffers(u32 buffers); +#define MAP_IP6_REASS_CONF_BUFFERS_MAX (0xffffffff) + +static_always_inline +int ip6_parse(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) { + *l4_protocol = ((ip6_frag_hdr_t *)(ip6 + 1))->next_hdr; + *frag_hdr_offset = sizeof(*ip6); + *l4_offset = sizeof(*ip6) + sizeof(ip6_frag_hdr_t); + } else { + *l4_protocol = ip6->protocol; + *frag_hdr_offset = 0; + *l4_offset = sizeof(*ip6); + } + + return (buff_len < (*l4_offset + 4)) || + (clib_net_to_host_u16(ip6->payload_length) < (*l4_offset + 4 - sizeof(*ip6))); +} + + +#define u8_ptr_add(ptr, index) (((u8 *)ptr) + index) +#define u16_net_add(u, val) clib_host_to_net_u16(clib_net_to_host_u16(u) + (val)) + +#define frag_id_6to4(id) ((id) ^ ((id) >> 16)) + +static_always_inline void +ip4_map_t_embedded_address (map_domain_t *d, + ip6_address_t *ip6, const ip4_address_t *ip4) +{ + ASSERT(d->ip6_src_len == 96); //No support for other lengths for now + ip6->as_u64[0] = d->ip6_src.as_u64[0]; + ip6->as_u32[2] = d->ip6_src.as_u32[2]; + ip6->as_u32[3] = ip4->as_u32; +} + +static_always_inline u32 +ip6_map_t_embedded_address (map_domain_t *d, ip6_address_t *addr) +{ + ASSERT(d->ip6_src_len == 96); //No support for other lengths for now + return addr->as_u32[3]; +} + +static inline void +map_domain_counter_lock (map_main_t *mm) +{ + if (mm->counter_lock) + while (__sync_lock_test_and_set(mm->counter_lock, 1)) + /* zzzz */ ; +} +static inline void +map_domain_counter_unlock (map_main_t *mm) +{ + if (mm->counter_lock) + *mm->counter_lock = 0; +} + + +static_always_inline void +map_send_all_to_node(vlib_main_t *vm, u32 *pi_vector, + vlib_node_runtime_t *node, vlib_error_t *error, + u32 next) +{ + u32 n_left_from, *from, next_index, *to_next, n_left_to_next; + //Deal with fragments that are ready + from = pi_vector; + n_left_from = vec_len(pi_vector); + next_index = node->cached_next_index; + while (n_left_from > 0) { + vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next); + while (n_left_from > 0 && n_left_to_next > 0) { + u32 pi0 = to_next[0] = from[0]; + from += 1; + n_left_from -= 1; + to_next += 1; + n_left_to_next -= 1; + vlib_buffer_t *p0 = vlib_get_buffer(vm, pi0); + p0->error = *error; + vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, pi0, next); + } + vlib_put_next_frame(vm, node, next_index, n_left_to_next); + } +} + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |