diff options
Diffstat (limited to 'net/openvswitch/flow.c')
| -rw-r--r-- | net/openvswitch/flow.c | 1605 |
1 files changed, 24 insertions, 1581 deletions
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c index 410db90db73d..b409f5279601 100644 --- a/net/openvswitch/flow.c +++ b/net/openvswitch/flow.c @@ -45,202 +45,38 @@ #include <net/ipv6.h> #include <net/ndisc.h> -static struct kmem_cache *flow_cache; - -static void ovs_sw_flow_mask_set(struct sw_flow_mask *mask, - struct sw_flow_key_range *range, u8 val); - -static void update_range__(struct sw_flow_match *match, - size_t offset, size_t size, bool is_mask) +u64 ovs_flow_used_time(unsigned long flow_jiffies) { - struct sw_flow_key_range *range = NULL; - size_t start = rounddown(offset, sizeof(long)); - size_t end = roundup(offset + size, sizeof(long)); - - if (!is_mask) - range = &match->range; - else if (match->mask) - range = &match->mask->range; - - if (!range) - return; - - if (range->start == range->end) { - range->start = start; - range->end = end; - return; - } - - if (range->start > start) - range->start = start; + struct timespec cur_ts; + u64 cur_ms, idle_ms; - if (range->end < end) - range->end = end; -} + ktime_get_ts(&cur_ts); + idle_ms = jiffies_to_msecs(jiffies - flow_jiffies); + cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC + + cur_ts.tv_nsec / NSEC_PER_MSEC; -#define SW_FLOW_KEY_PUT(match, field, value, is_mask) \ - do { \ - update_range__(match, offsetof(struct sw_flow_key, field), \ - sizeof((match)->key->field), is_mask); \ - if (is_mask) { \ - if ((match)->mask) \ - (match)->mask->key.field = value; \ - } else { \ - (match)->key->field = value; \ - } \ - } while (0) - -#define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask) \ - do { \ - update_range__(match, offsetof(struct sw_flow_key, field), \ - len, is_mask); \ - if (is_mask) { \ - if ((match)->mask) \ - memcpy(&(match)->mask->key.field, value_p, len);\ - } else { \ - memcpy(&(match)->key->field, value_p, len); \ - } \ - } while (0) - -static u16 range_n_bytes(const struct sw_flow_key_range *range) -{ - return range->end - range->start; + return cur_ms - idle_ms; } -void ovs_match_init(struct sw_flow_match *match, - struct sw_flow_key *key, - struct sw_flow_mask *mask) -{ - memset(match, 0, sizeof(*match)); - match->key = key; - match->mask = mask; +#define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF)) - memset(key, 0, sizeof(*key)); - - if (mask) { - memset(&mask->key, 0, sizeof(mask->key)); - mask->range.start = mask->range.end = 0; - } -} - -static bool ovs_match_validate(const struct sw_flow_match *match, - u64 key_attrs, u64 mask_attrs) +void ovs_flow_used(struct sw_flow *flow, struct sk_buff *skb) { - u64 key_expected = 1 << OVS_KEY_ATTR_ETHERNET; - u64 mask_allowed = key_attrs; /* At most allow all key attributes */ - - /* The following mask attributes allowed only if they - * pass the validation tests. */ - mask_allowed &= ~((1 << OVS_KEY_ATTR_IPV4) - | (1 << OVS_KEY_ATTR_IPV6) - | (1 << OVS_KEY_ATTR_TCP) - | (1 << OVS_KEY_ATTR_UDP) - | (1 << OVS_KEY_ATTR_SCTP) - | (1 << OVS_KEY_ATTR_ICMP) - | (1 << OVS_KEY_ATTR_ICMPV6) - | (1 << OVS_KEY_ATTR_ARP) - | (1 << OVS_KEY_ATTR_ND)); - - /* Always allowed mask fields. */ - mask_allowed |= ((1 << OVS_KEY_ATTR_TUNNEL) - | (1 << OVS_KEY_ATTR_IN_PORT) - | (1 << OVS_KEY_ATTR_ETHERTYPE)); - - /* Check key attributes. */ - if (match->key->eth.type == htons(ETH_P_ARP) - || match->key->eth.type == htons(ETH_P_RARP)) { - key_expected |= 1 << OVS_KEY_ATTR_ARP; - if (match->mask && (match->mask->key.eth.type == htons(0xffff))) - mask_allowed |= 1 << OVS_KEY_ATTR_ARP; - } + __be16 tcp_flags = 0; - if (match->key->eth.type == htons(ETH_P_IP)) { - key_expected |= 1 << OVS_KEY_ATTR_IPV4; - if (match->mask && (match->mask->key.eth.type == htons(0xffff))) - mask_allowed |= 1 << OVS_KEY_ATTR_IPV4; - - if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) { - if (match->key->ip.proto == IPPROTO_UDP) { - key_expected |= 1 << OVS_KEY_ATTR_UDP; - if (match->mask && (match->mask->key.ip.proto == 0xff)) - mask_allowed |= 1 << OVS_KEY_ATTR_UDP; - } - - if (match->key->ip.proto == IPPROTO_SCTP) { - key_expected |= 1 << OVS_KEY_ATTR_SCTP; - if (match->mask && (match->mask->key.ip.proto == 0xff)) - mask_allowed |= 1 << OVS_KEY_ATTR_SCTP; - } - - if (match->key->ip.proto == IPPROTO_TCP) { - key_expected |= 1 << OVS_KEY_ATTR_TCP; - if (match->mask && (match->mask->key.ip.proto == 0xff)) - mask_allowed |= 1 << OVS_KEY_ATTR_TCP; - } - - if (match->key->ip.proto == IPPROTO_ICMP) { - key_expected |= 1 << OVS_KEY_ATTR_ICMP; - if (match->mask && (match->mask->key.ip.proto == 0xff)) - mask_allowed |= 1 << OVS_KEY_ATTR_ICMP; - } - } - } - - if (match->key->eth.type == htons(ETH_P_IPV6)) { - key_expected |= 1 << OVS_KEY_ATTR_IPV6; - if (match->mask && (match->mask->key.eth.type == htons(0xffff))) - mask_allowed |= 1 << OVS_KEY_ATTR_IPV6; - - if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) { - if (match->key->ip.proto == IPPROTO_UDP) { - key_expected |= 1 << OVS_KEY_ATTR_UDP; - if (match->mask && (match->mask->key.ip.proto == 0xff)) - mask_allowed |= 1 << OVS_KEY_ATTR_UDP; - } - - if (match->key->ip.proto == IPPROTO_SCTP) { - key_expected |= 1 << OVS_KEY_ATTR_SCTP; - if (match->mask && (match->mask->key.ip.proto == 0xff)) - mask_allowed |= 1 << OVS_KEY_ATTR_SCTP; - } - - if (match->key->ip.proto == IPPROTO_TCP) { - key_expected |= 1 << OVS_KEY_ATTR_TCP; - if (match->mask && (match->mask->key.ip.proto == 0xff)) - mask_allowed |= 1 << OVS_KEY_ATTR_TCP; - } - - if (match->key->ip.proto == IPPROTO_ICMPV6) { - key_expected |= 1 << OVS_KEY_ATTR_ICMPV6; - if (match->mask && (match->mask->key.ip.proto == 0xff)) - mask_allowed |= 1 << OVS_KEY_ATTR_ICMPV6; - - if (match->key->ipv6.tp.src == - htons(NDISC_NEIGHBOUR_SOLICITATION) || - match->key->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) { - key_expected |= 1 << OVS_KEY_ATTR_ND; - if (match->mask && (match->mask->key.ipv6.tp.src == htons(0xffff))) - mask_allowed |= 1 << OVS_KEY_ATTR_ND; - } - } - } - } - - if ((key_attrs & key_expected) != key_expected) { - /* Key attributes check failed. */ - OVS_NLERR("Missing expected key attributes (key_attrs=%llx, expected=%llx).\n", - key_attrs, key_expected); - return false; - } - - if ((mask_attrs & mask_allowed) != mask_attrs) { - /* Mask attributes check failed. */ - OVS_NLERR("Contain more than allowed mask fields (mask_attrs=%llx, mask_allowed=%llx).\n", - mask_attrs, mask_allowed); - return false; + if ((flow->key.eth.type == htons(ETH_P_IP) || + flow->key.eth.type == htons(ETH_P_IPV6)) && + flow->key.ip.proto == IPPROTO_TCP && + likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) { + tcp_flags = TCP_FLAGS_BE16(tcp_hdr(skb)); } - return true; + spin_lock(&flow->lock); + flow->used = jiffies; + flow->packet_count++; + flow->byte_count += skb->len; + flow->tcp_flags |= tcp_flags; + spin_unlock(&flow->lock); } static int check_header(struct sk_buff *skb, int len) @@ -311,19 +147,6 @@ static bool icmphdr_ok(struct sk_buff *skb) sizeof(struct icmphdr)); } -u64 ovs_flow_used_time(unsigned long flow_jiffies) -{ - struct timespec cur_ts; - u64 cur_ms, idle_ms; - - ktime_get_ts(&cur_ts); - idle_ms = jiffies_to_msecs(jiffies - flow_jiffies); - cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC + - cur_ts.tv_nsec / NSEC_PER_MSEC; - - return cur_ms - idle_ms; -} - static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key) { unsigned int nh_ofs = skb_network_offset(skb); @@ -372,311 +195,6 @@ static bool icmp6hdr_ok(struct sk_buff *skb) sizeof(struct icmp6hdr)); } -void ovs_flow_key_mask(struct sw_flow_key *dst, const struct sw_flow_key *src, - const struct sw_flow_mask *mask) -{ - const long *m = (long *)((u8 *)&mask->key + mask->range.start); - const long *s = (long *)((u8 *)src + mask->range.start); - long *d = (long *)((u8 *)dst + mask->range.start); - int i; - - /* The memory outside of the 'mask->range' are not set since - * further operations on 'dst' only uses contents within - * 'mask->range'. - */ - for (i = 0; i < range_n_bytes(&mask->range); i += sizeof(long)) - *d++ = *s++ & *m++; -} - -#define TCP_FLAGS_OFFSET 13 -#define TCP_FLAG_MASK 0x3f - -void ovs_flow_used(struct sw_flow *flow, struct sk_buff *skb) -{ - u8 tcp_flags = 0; - - if ((flow->key.eth.type == htons(ETH_P_IP) || - flow->key.eth.type == htons(ETH_P_IPV6)) && - flow->key.ip.proto == IPPROTO_TCP && - likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) { - u8 *tcp = (u8 *)tcp_hdr(skb); - tcp_flags = *(tcp + TCP_FLAGS_OFFSET) & TCP_FLAG_MASK; - } - - spin_lock(&flow->lock); - flow->used = jiffies; - flow->packet_count++; - flow->byte_count += skb->len; - flow->tcp_flags |= tcp_flags; - spin_unlock(&flow->lock); -} - -struct sw_flow_actions *ovs_flow_actions_alloc(int size) -{ - struct sw_flow_actions *sfa; - - if (size > MAX_ACTIONS_BUFSIZE) - return ERR_PTR(-EINVAL); - - sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL); - if (!sfa) - return ERR_PTR(-ENOMEM); - - sfa->actions_len = 0; - return sfa; -} - -struct sw_flow *ovs_flow_alloc(void) -{ - struct sw_flow *flow; - - flow = kmem_cache_alloc(flow_cache, GFP_KERNEL); - if (!flow) - return ERR_PTR(-ENOMEM); - - spin_lock_init(&flow->lock); - flow->sf_acts = NULL; - flow->mask = NULL; - - return flow; -} - -static struct hlist_head *find_bucket(struct flow_table *table, u32 hash) -{ - hash = jhash_1word(hash, table->hash_seed); - return flex_array_get(table->buckets, - (hash & (table->n_buckets - 1))); -} - -static struct flex_array *alloc_buckets(unsigned int n_buckets) -{ - struct flex_array *buckets; - int i, err; - - buckets = flex_array_alloc(sizeof(struct hlist_head), - n_buckets, GFP_KERNEL); - if (!buckets) - return NULL; - - err = flex_array_prealloc(buckets, 0, n_buckets, GFP_KERNEL); - if (err) { - flex_array_free(buckets); - return NULL; - } - - for (i = 0; i < n_buckets; i++) - INIT_HLIST_HEAD((struct hlist_head *) - flex_array_get(buckets, i)); - - return buckets; -} - -static void free_buckets(struct flex_array *buckets) -{ - flex_array_free(buckets); -} - -static struct flow_table *__flow_tbl_alloc(int new_size) -{ - struct flow_table *table = kmalloc(sizeof(*table), GFP_KERNEL); - - if (!table) - return NULL; - - table->buckets = alloc_buckets(new_size); - - if (!table->buckets) { - kfree(table); - return NULL; - } - table->n_buckets = new_size; - table->count = 0; - table->node_ver = 0; - table->keep_flows = false; - get_random_bytes(&table->hash_seed, sizeof(u32)); - table->mask_list = NULL; - - return table; -} - -static void __flow_tbl_destroy(struct flow_table *table) -{ - int i; - - if (table->keep_flows) - goto skip_flows; - - for (i = 0; i < table->n_buckets; i++) { - struct sw_flow *flow; - struct hlist_head *head = flex_array_get(table->buckets, i); - struct hlist_node *n; - int ver = table->node_ver; - - hlist_for_each_entry_safe(flow, n, head, hash_node[ver]) { - hlist_del(&flow->hash_node[ver]); - ovs_flow_free(flow, false); - } - } - - BUG_ON(!list_empty(table->mask_list)); - kfree(table->mask_list); - -skip_flows: - free_buckets(table->buckets); - kfree(table); -} - -struct flow_table *ovs_flow_tbl_alloc(int new_size) -{ - struct flow_table *table = __flow_tbl_alloc(new_size); - - if (!table) - return NULL; - - table->mask_list = kmalloc(sizeof(struct list_head), GFP_KERNEL); - if (!table->mask_list) { - table->keep_flows = true; - __flow_tbl_destroy(table); - return NULL; - } - INIT_LIST_HEAD(table->mask_list); - - return table; -} - -static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu) -{ - struct flow_table *table = container_of(rcu, struct flow_table, rcu); - - __flow_tbl_destroy(table); -} - -void ovs_flow_tbl_destroy(struct flow_table *table, bool deferred) -{ - if (!table) - return; - - if (deferred) - call_rcu(&table->rcu, flow_tbl_destroy_rcu_cb); - else - __flow_tbl_destroy(table); -} - -struct sw_flow *ovs_flow_dump_next(struct flow_table *table, u32 *bucket, u32 *last) -{ - struct sw_flow *flow; - struct hlist_head *head; - int ver; - int i; - - ver = table->node_ver; - while (*bucket < table->n_buckets) { - i = 0; - head = flex_array_get(table->buckets, *bucket); - hlist_for_each_entry_rcu(flow, head, hash_node[ver]) { - if (i < *last) { - i++; - continue; - } - *last = i + 1; - return flow; - } - (*bucket)++; - *last = 0; - } - - return NULL; -} - -static void __tbl_insert(struct flow_table *table, struct sw_flow *flow) -{ - struct hlist_head *head; - - head = find_bucket(table, flow->hash); - hlist_add_head_rcu(&flow->hash_node[table->node_ver], head); - - table->count++; -} - -static void flow_table_copy_flows(struct flow_table *old, struct flow_table *new) -{ - int old_ver; - int i; - - old_ver = old->node_ver; - new->node_ver = !old_ver; - - /* Insert in new table. */ - for (i = 0; i < old->n_buckets; i++) { - struct sw_flow *flow; - struct hlist_head *head; - - head = flex_array_get(old->buckets, i); - - hlist_for_each_entry(flow, head, hash_node[old_ver]) - __tbl_insert(new, flow); - } - - new->mask_list = old->mask_list; - old->keep_flows = true; -} - -static struct flow_table *__flow_tbl_rehash(struct flow_table *table, int n_buckets) -{ - struct flow_table *new_table; - - new_table = __flow_tbl_alloc(n_buckets); - if (!new_table) - return ERR_PTR(-ENOMEM); - - flow_table_copy_flows(table, new_table); - - return new_table; -} - -struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table) -{ - return __flow_tbl_rehash(table, table->n_buckets); -} - -struct flow_table *ovs_flow_tbl_expand(struct flow_table *table) -{ - return __flow_tbl_rehash(table, table->n_buckets * 2); -} - -static void __flow_free(struct sw_flow *flow) -{ - kfree((struct sf_flow_acts __force *)flow->sf_acts); - kmem_cache_free(flow_cache, flow); -} - -static void rcu_free_flow_callback(struct rcu_head *rcu) -{ - struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu); - - __flow_free(flow); -} - -void ovs_flow_free(struct sw_flow *flow, bool deferred) -{ - if (!flow) - return; - - ovs_sw_flow_mask_del_ref(flow->mask, deferred); - - if (deferred) - call_rcu(&flow->rcu, rcu_free_flow_callback); - else - __flow_free(flow); -} - -/* Schedules 'sf_acts' to be freed after the next RCU grace period. - * The caller must hold rcu_read_lock for this to be sensible. */ -void ovs_flow_deferred_free_acts(struct sw_flow_actions *sf_acts) -{ - kfree_rcu(sf_acts, rcu); -} - static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key) { struct qtag_prefix { @@ -910,6 +428,7 @@ int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key) struct tcphdr *tcp = tcp_hdr(skb); key->ipv4.tp.src = tcp->source; key->ipv4.tp.dst = tcp->dest; + key->ipv4.tp.flags = TCP_FLAGS_BE16(tcp); } } else if (key->ip.proto == IPPROTO_UDP) { if (udphdr_ok(skb)) { @@ -978,6 +497,7 @@ int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key) struct tcphdr *tcp = tcp_hdr(skb); key->ipv6.tp.src = tcp->source; key->ipv6.tp.dst = tcp->dest; + key->ipv6.tp.flags = TCP_FLAGS_BE16(tcp); } } else if (key->ip.proto == NEXTHDR_UDP) { if (udphdr_ok(skb)) { @@ -1002,1080 +522,3 @@ int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key) return 0; } - -static u32 ovs_flow_hash(const struct sw_flow_key *key, int key_start, - int key_end) -{ - u32 *hash_key = (u32 *)((u8 *)key + key_start); - int hash_u32s = (key_end - key_start) >> 2; - - /* Make sure number of hash bytes are multiple of u32. */ - BUILD_BUG_ON(sizeof(long) % sizeof(u32)); - - return jhash2(hash_key, hash_u32s, 0); -} - -static int flow_key_start(const struct sw_flow_key *key) -{ - if (key->tun_key.ipv4_dst) - return 0; - else - return rounddown(offsetof(struct sw_flow_key, phy), - sizeof(long)); -} - -static bool __cmp_key(const struct sw_flow_key *key1, - const struct sw_flow_key *key2, int key_start, int key_end) -{ - const long *cp1 = (long *)((u8 *)key1 + key_start); - const long *cp2 = (long *)((u8 *)key2 + key_start); - long diffs = 0; - int i; - - for (i = key_start; i < key_end; i += sizeof(long)) - diffs |= *cp1++ ^ *cp2++; - - return diffs == 0; -} - -static bool __flow_cmp_masked_key(const struct sw_flow *flow, - const struct sw_flow_key *key, int key_start, int key_end) -{ - return __cmp_key(&flow->key, key, key_start, key_end); -} - -static bool __flow_cmp_unmasked_key(const struct sw_flow *flow, - const struct sw_flow_key *key, int key_start, int key_end) -{ - return __cmp_key(&flow->unmasked_key, key, key_start, key_end); -} - -bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow, - const struct sw_flow_key *key, int key_end) -{ - int key_start; - key_start = flow_key_start(key); - - return __flow_cmp_unmasked_key(flow, key, key_start, key_end); - -} - -struct sw_flow *ovs_flow_lookup_unmasked_key(struct flow_table *table, - struct sw_flow_match *match) -{ - struct sw_flow_key *unmasked = match->key; - int key_end = match->range.end; - struct sw_flow *flow; - - flow = ovs_flow_lookup(table, unmasked); - if (flow && (!ovs_flow_cmp_unmasked_key(flow, unmasked, key_end))) - flow = NULL; - - return flow; -} - -static struct sw_flow *ovs_masked_flow_lookup(struct flow_table *table, - const struct sw_flow_key *unmasked, - struct sw_flow_mask *mask) -{ - struct sw_flow *flow; - struct hlist_head *head; - int key_start = mask->range.start; - int key_end = mask->range.end; - u32 hash; - struct sw_flow_key masked_key; - - ovs_flow_key_mask(&masked_key, unmasked, mask); - hash = ovs_flow_hash(&masked_key, key_start, key_end); - head = find_bucket(table, hash); - hlist_for_each_entry_rcu(flow, head, hash_node[table->node_ver]) { - if (flow->mask == mask && - __flow_cmp_masked_key(flow, &masked_key, - key_start, key_end)) - return flow; - } - return NULL; -} - -struct sw_flow *ovs_flow_lookup(struct flow_table *tbl, - const struct sw_flow_key *key) -{ - struct sw_flow *flow = NULL; - struct sw_flow_mask *mask; - - list_for_each_entry_rcu(mask, tbl->mask_list, list) { - flow = ovs_masked_flow_lookup(tbl, key, mask); - if (flow) /* Found */ - break; - } - - return flow; -} - - -void ovs_flow_insert(struct flow_table *table, struct sw_flow *flow) -{ - flow->hash = ovs_flow_hash(&flow->key, flow->mask->range.start, - flow->mask->range.end); - __tbl_insert(table, flow); -} - -void ovs_flow_remove(struct flow_table *table, struct sw_flow *flow) -{ - BUG_ON(table->count == 0); - hlist_del_rcu(&flow->hash_node[table->node_ver]); - table->count--; -} - -/* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute. */ -const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = { - [OVS_KEY_ATTR_ENCAP] = -1, - [OVS_KEY_ATTR_PRIORITY] = sizeof(u32), - [OVS_KEY_ATTR_IN_PORT] = sizeof(u32), - [OVS_KEY_ATTR_SKB_MARK] = sizeof(u32), - [OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet), - [OVS_KEY_ATTR_VLAN] = sizeof(__be16), - [OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16), - [OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4), - [OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6), - [OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp), - [OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp), - [OVS_KEY_ATTR_SCTP] = sizeof(struct ovs_key_sctp), - [OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp), - [OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6), - [OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp), - [OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd), - [OVS_KEY_ATTR_TUNNEL] = -1, -}; - -static bool is_all_zero(const u8 *fp, size_t size) -{ - int i; - - if (!fp) - return false; - - for (i = 0; i < size; i++) - if (fp[i]) - return false; - - return true; -} - -static int __parse_flow_nlattrs(const struct nlattr *attr, - const struct nlattr *a[], - u64 *attrsp, bool nz) -{ - const struct nlattr *nla; - u32 attrs; - int rem; - - attrs = *attrsp; - nla_for_each_nested(nla, attr, rem) { - u16 type = nla_type(nla); - int expected_len; - - if (type > OVS_KEY_ATTR_MAX) { - OVS_NLERR("Unknown key attribute (type=%d, max=%d).\n", - type, OVS_KEY_ATTR_MAX); - return -EINVAL; - } - - if (attrs & (1 << type)) { - OVS_NLERR("Duplicate key attribute (type %d).\n", type); - return -EINVAL; - } - - expected_len = ovs_key_lens[type]; - if (nla_len(nla) != expected_len && expected_len != -1) { - OVS_NLERR("Key attribute has unexpected length (type=%d" - ", length=%d, expected=%d).\n", type, - nla_len(nla), expected_len); - return -EINVAL; - } - - if (!nz || !is_all_zero(nla_data(nla), expected_len)) { - attrs |= 1 << type; - a[type] = nla; - } - } - if (rem) { - OVS_NLERR("Message has %d unknown bytes.\n", rem); - return -EINVAL; - } - - *attrsp = attrs; - return 0; -} - -static int parse_flow_mask_nlattrs(const struct nlattr *attr, - const struct nlattr *a[], u64 *attrsp) -{ - return __parse_flow_nlattrs(attr, a, attrsp, true); -} - -static int parse_flow_nlattrs(const struct nlattr *attr, - const struct nlattr *a[], u64 *attrsp) -{ - return __parse_flow_nlattrs(attr, a, attrsp, false); -} - -int ovs_ipv4_tun_from_nlattr(const struct nlattr *attr, - struct sw_flow_match *match, bool is_mask) -{ - struct nlattr *a; - int rem; - bool ttl = false; - __be16 tun_flags = 0; - - nla_for_each_nested(a, attr, rem) { - int type = nla_type(a); - static const u32 ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = { - [OVS_TUNNEL_KEY_ATTR_ID] = sizeof(u64), - [OVS_TUNNEL_KEY_ATTR_IPV4_SRC] = sizeof(u32), - [OVS_TUNNEL_KEY_ATTR_IPV4_DST] = sizeof(u32), - [OVS_TUNNEL_KEY_ATTR_TOS] = 1, - [OVS_TUNNEL_KEY_ATTR_TTL] = 1, - [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = 0, - [OVS_TUNNEL_KEY_ATTR_CSUM] = 0, - }; - - if (type > OVS_TUNNEL_KEY_ATTR_MAX) { - OVS_NLERR("Unknown IPv4 tunnel attribute (type=%d, max=%d).\n", - type, OVS_TUNNEL_KEY_ATTR_MAX); - return -EINVAL; - } - - if (ovs_tunnel_key_lens[type] != nla_len(a)) { - OVS_NLERR("IPv4 tunnel attribute type has unexpected " - " length (type=%d, length=%d, expected=%d).\n", - type, nla_len(a), ovs_tunnel_key_lens[type]); - return -EINVAL; - } - - switch (type) { - case OVS_TUNNEL_KEY_ATTR_ID: - SW_FLOW_KEY_PUT(match, tun_key.tun_id, - nla_get_be64(a), is_mask); - tun_flags |= TUNNEL_KEY; - break; - case OVS_TUNNEL_KEY_ATTR_IPV4_SRC: - SW_FLOW_KEY_PUT(match, tun_key.ipv4_src, - nla_get_be32(a), is_mask); - break; - case OVS_TUNNEL_KEY_ATTR_IPV4_DST: - SW_FLOW_KEY_PUT(match, tun_key.ipv4_dst, - nla_get_be32(a), is_mask); - break; - case OVS_TUNNEL_KEY_ATTR_TOS: - SW_FLOW_KEY_PUT(match, tun_key.ipv4_tos, - nla_get_u8(a), is_mask); - break; - case OVS_TUNNEL_KEY_ATTR_TTL: - SW_FLOW_KEY_PUT(match, tun_key.ipv4_ttl, - nla_get_u8(a), is_mask); - ttl = true; - break; - case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT: - tun_flags |= TUNNEL_DONT_FRAGMENT; - break; - case OVS_TUNNEL_KEY_ATTR_CSUM: - tun_flags |= TUNNEL_CSUM; - break; - default: - return -EINVAL; - } - } - - SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask); - - if (rem > 0) { - OVS_NLERR("IPv4 tunnel attribute has %d unknown bytes.\n", rem); - return -EINVAL; - } - - if (!is_mask) { - if (!match->key->tun_key.ipv4_dst) { - OVS_NLERR("IPv4 tunnel destination address is zero.\n"); - return -EINVAL; - } - - if (!ttl) { - OVS_NLERR("IPv4 tunnel TTL not specified.\n"); - return -EINVAL; - } - } - - return 0; -} - -int ovs_ipv4_tun_to_nlattr(struct sk_buff *skb, - const struct ovs_key_ipv4_tunnel *tun_key, - const struct ovs_key_ipv4_tunnel *output) -{ - struct nlattr *nla; - - nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL); - if (!nla) - return -EMSGSIZE; - - if (output->tun_flags & TUNNEL_KEY && - nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id)) - return -EMSGSIZE; - if (output->ipv4_src && - nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, output->ipv4_src)) - return -EMSGSIZE; - if (output->ipv4_dst && - nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, output->ipv4_dst)) - return -EMSGSIZE; - if (output->ipv4_tos && - nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->ipv4_tos)) - return -EMSGSIZE; - if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ipv4_ttl)) - return -EMSGSIZE; - if ((output->tun_flags & TUNNEL_DONT_FRAGMENT) && - nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT)) - return -EMSGSIZE; - if ((output->tun_flags & TUNNEL_CSUM) && - nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM)) - return -EMSGSIZE; - - nla_nest_end(skb, nla); - return 0; -} - -static int metadata_from_nlattrs(struct sw_flow_match *match, u64 *attrs, - const struct nlattr **a, bool is_mask) -{ - if (*attrs & (1 << OVS_KEY_ATTR_PRIORITY)) { - SW_FLOW_KEY_PUT(match, phy.priority, - nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask); - *attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY); - } - - if (*attrs & (1 << OVS_KEY_ATTR_IN_PORT)) { - u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]); - - if (is_mask) - in_port = 0xffffffff; /* Always exact match in_port. */ - else if (in_port >= DP_MAX_PORTS) - return -EINVAL; - - SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask); - *attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT); - } else if (!is_mask) { - SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask); - } - - if (*attrs & (1 << OVS_KEY_ATTR_SKB_MARK)) { - uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]); - - SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask); - *attrs &= ~(1 << OVS_KEY_ATTR_SKB_MARK); - } - if (*attrs & (1 << OVS_KEY_ATTR_TUNNEL)) { - if (ovs_ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match, - is_mask)) - return -EINVAL; - *attrs &= ~(1 << OVS_KEY_ATTR_TUNNEL); - } - return 0; -} - -static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs, - const struct nlattr **a, bool is_mask) -{ - int err; - u64 orig_attrs = attrs; - - err = metadata_from_nlattrs(match, &attrs, a, is_mask); - if (err) - return err; - - if (attrs & (1 << OVS_KEY_ATTR_ETHERNET)) { - const struct ovs_key_ethernet *eth_key; - - eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]); - SW_FLOW_KEY_MEMCPY(match, eth.src, - eth_key->eth_src, ETH_ALEN, is_mask); - SW_FLOW_KEY_MEMCPY(match, eth.dst, - eth_key->eth_dst, ETH_ALEN, is_mask); - attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET); - } - - if (attrs & (1 << OVS_KEY_ATTR_VLAN)) { - __be16 tci; - - tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]); - if (!(tci & htons(VLAN_TAG_PRESENT))) { - if (is_mask) - OVS_NLERR("VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.\n"); - else - OVS_NLERR("VLAN TCI does not have VLAN_TAG_PRESENT bit set.\n"); - - return -EINVAL; - } - - SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask); - attrs &= ~(1 << OVS_KEY_ATTR_VLAN); - } else if (!is_mask) - SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true); - - if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) { - __be16 eth_type; - - eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]); - if (is_mask) { - /* Always exact match EtherType. */ - eth_type = htons(0xffff); - } else if (ntohs(eth_type) < ETH_P_802_3_MIN) { - OVS_NLERR("EtherType is less than minimum (type=%x, min=%x).\n", - ntohs(eth_type), ETH_P_802_3_MIN); - return -EINVAL; - } - - SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask); - attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE); - } else if (!is_mask) { - SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask); - } - - if (attrs & (1 << OVS_KEY_ATTR_IPV4)) { - const struct ovs_key_ipv4 *ipv4_key; - - ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]); - if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) { - OVS_NLERR("Unknown IPv4 fragment type (value=%d, max=%d).\n", - ipv4_key->ipv4_frag, OVS_FRAG_TYPE_MAX); - return -EINVAL; - } - SW_FLOW_KEY_PUT(match, ip.proto, - ipv4_key->ipv4_proto, is_mask); - SW_FLOW_KEY_PUT(match, ip.tos, - ipv4_key->ipv4_tos, is_mask); - SW_FLOW_KEY_PUT(match, ip.ttl, - ipv4_key->ipv4_ttl, is_mask); - SW_FLOW_KEY_PUT(match, ip.frag, - ipv4_key->ipv4_frag, is_mask); - SW_FLOW_KEY_PUT(match, ipv4.addr.src, - ipv4_key->ipv4_src, is_mask); - SW_FLOW_KEY_PUT(match, ipv4.addr.dst, - ipv4_key->ipv4_dst, is_mask); - attrs &= ~(1 << OVS_KEY_ATTR_IPV4); - } - - if (attrs & (1 << OVS_KEY_ATTR_IPV6)) { - const struct ovs_key_ipv6 *ipv6_key; - - ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]); - if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) { - OVS_NLERR("Unknown IPv6 fragment type (value=%d, max=%d).\n", - ipv6_key->ipv6_frag, OVS_FRAG_TYPE_MAX); - return -EINVAL; - } - SW_FLOW_KEY_PUT(match, ipv6.label, - ipv6_key->ipv6_label, is_mask); - SW_FLOW_KEY_PUT(match, ip.proto, - ipv6_key->ipv6_proto, is_mask); - SW_FLOW_KEY_PUT(match, ip.tos, - ipv6_key->ipv6_tclass, is_mask); - SW_FLOW_KEY_PUT(match, ip.ttl, - ipv6_key->ipv6_hlimit, is_mask); - SW_FLOW_KEY_PUT(match, ip.frag, - ipv6_key->ipv6_frag, is_mask); - SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src, - ipv6_key->ipv6_src, - sizeof(match->key->ipv6.addr.src), - is_mask); - SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst, - ipv6_key->ipv6_dst, - sizeof(match->key->ipv6.addr.dst), - is_mask); - - attrs &= ~(1 << OVS_KEY_ATTR_IPV6); - } - - if (attrs & (1 << OVS_KEY_ATTR_ARP)) { - const struct ovs_key_arp *arp_key; - - arp_key = nla_data(a[OVS_KEY_ATTR_ARP]); - if (!is_mask && (arp_key->arp_op & htons(0xff00))) { - OVS_NLERR("Unknown ARP opcode (opcode=%d).\n", - arp_key->arp_op); - return -EINVAL; - } - - SW_FLOW_KEY_PUT(match, ipv4.addr.src, - arp_key->arp_sip, is_mask); - SW_FLOW_KEY_PUT(match, ipv4.addr.dst, - arp_key->arp_tip, is_mask); - SW_FLOW_KEY_PUT(match, ip.proto, - ntohs(arp_key->arp_op), is_mask); - SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha, - arp_key->arp_sha, ETH_ALEN, is_mask); - SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha, - arp_key->arp_tha, ETH_ALEN, is_mask); - - attrs &= ~(1 << OVS_KEY_ATTR_ARP); - } - - if (attrs & (1 << OVS_KEY_ATTR_TCP)) { - const struct ovs_key_tcp *tcp_key; - - tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]); - if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) { - SW_FLOW_KEY_PUT(match, ipv4.tp.src, - tcp_key->tcp_src, is_mask); - SW_FLOW_KEY_PUT(match, ipv4.tp.dst, - tcp_key->tcp_dst, is_mask); - } else { - SW_FLOW_KEY_PUT(match, ipv6.tp.src, - tcp_key->tcp_src, is_mask); - SW_FLOW_KEY_PUT(match, ipv6.tp.dst, - tcp_key->tcp_dst, is_mask); - } - attrs &= ~(1 << OVS_KEY_ATTR_TCP); - } - - if (attrs & (1 << OVS_KEY_ATTR_UDP)) { - const struct ovs_key_udp *udp_key; - - udp_key = nla_data(a[OVS_KEY_ATTR_UDP]); - if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) { - SW_FLOW_KEY_PUT(match, ipv4.tp.src, - udp_key->udp_src, is_mask); - SW_FLOW_KEY_PUT(match, ipv4.tp.dst, - udp_key->udp_dst, is_mask); - } else { - SW_FLOW_KEY_PUT(match, ipv6.tp.src, - udp_key->udp_src, is_mask); - SW_FLOW_KEY_PUT(match, ipv6.tp.dst, - udp_key->udp_dst, is_mask); - } - attrs &= ~(1 << OVS_KEY_ATTR_UDP); - } - - if (attrs & (1 << OVS_KEY_ATTR_SCTP)) { - const struct ovs_key_sctp *sctp_key; - - sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]); - if (orig_attrs & (1 << OVS_KEY_ATTR_IPV4)) { - SW_FLOW_KEY_PUT(match, ipv4.tp.src, - sctp_key->sctp_src, is_mask); - SW_FLOW_KEY_PUT(match, ipv4.tp.dst, - sctp_key->sctp_dst, is_mask); - } else { - SW_FLOW_KEY_PUT(match, ipv6.tp.src, - sctp_key->sctp_src, is_mask); - SW_FLOW_KEY_PUT(match, ipv6.tp.dst, - sctp_key->sctp_dst, is_mask); - } - attrs &= ~(1 << OVS_KEY_ATTR_SCTP); - } - - if (attrs & (1 << OVS_KEY_ATTR_ICMP)) { - const struct ovs_key_icmp *icmp_key; - - icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]); - SW_FLOW_KEY_PUT(match, ipv4.tp.src, - htons(icmp_key->icmp_type), is_mask); - SW_FLOW_KEY_PUT(match, ipv4.tp.dst, - htons(icmp_key->icmp_code), is_mask); - attrs &= ~(1 << OVS_KEY_ATTR_ICMP); - } - - if (attrs & (1 << OVS_KEY_ATTR_ICMPV6)) { - const struct ovs_key_icmpv6 *icmpv6_key; - - icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]); - SW_FLOW_KEY_PUT(match, ipv6.tp.src, - htons(icmpv6_key->icmpv6_type), is_mask); - SW_FLOW_KEY_PUT(match, ipv6.tp.dst, - htons(icmpv6_key->icmpv6_code), is_mask); - attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6); - } - - if (attrs & (1 << OVS_KEY_ATTR_ND)) { - const struct ovs_key_nd *nd_key; - - nd_key = nla_data(a[OVS_KEY_ATTR_ND]); - SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target, - nd_key->nd_target, - sizeof(match->key->ipv6.nd.target), - is_mask); - SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll, - nd_key->nd_sll, ETH_ALEN, is_mask); - SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll, - nd_key->nd_tll, ETH_ALEN, is_mask); - attrs &= ~(1 << OVS_KEY_ATTR_ND); - } - - if (attrs != 0) - return -EINVAL; - - return 0; -} - -/** - * ovs_match_from_nlattrs - parses Netlink attributes into a flow key and - * mask. In case the 'mask' is NULL, the flow is treated as exact match - * flow. Otherwise, it is treated as a wildcarded flow, except the mask - * does not include any don't care bit. - * @match: receives the extracted flow match information. - * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute - * sequence. The fields should of the packet that triggered the creation - * of this flow. - * @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink - * attribute specifies the mask field of the wildcarded flow. - */ -int ovs_match_from_nlattrs(struct sw_flow_match *match, - const struct nlattr *key, - const struct nlattr *mask) -{ - const struct nlattr *a[OVS_KEY_ATTR_MAX + 1]; - const struct nlattr *encap; - u64 key_attrs = 0; - u64 mask_attrs = 0; - bool encap_valid = false; - int err; - - err = parse_flow_nlattrs(key, a, &key_attrs); - if (err) - return err; - - if ((key_attrs & (1 << OVS_KEY_ATTR_ETHERNET)) && - (key_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) && - (nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) { - __be16 tci; - - if (!((key_attrs & (1 << OVS_KEY_ATTR_VLAN)) && - (key_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) { - OVS_NLERR("Invalid Vlan frame.\n"); - return -EINVAL; - } - - key_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE); - tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]); - encap = a[OVS_KEY_ATTR_ENCAP]; - key_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP); - encap_valid = true; - - if (tci & htons(VLAN_TAG_PRESENT)) { - err = parse_flow_nlattrs(encap, a, &key_attrs); - if (err) - return err; - } else if (!tci) { - /* Corner case for truncated 802.1Q header. */ - if (nla_len(encap)) { - OVS_NLERR("Truncated 802.1Q header has non-zero encap attribute.\n"); - return -EINVAL; - } - } else { - OVS_NLERR("Encap attribute is set for a non-VLAN frame.\n"); - return -EINVAL; - } - } - - err = ovs_key_from_nlattrs(match, key_attrs, a, false); - if (err) - return err; - - if (mask) { - err = parse_flow_mask_nlattrs(mask, a, &mask_attrs); - if (err) - return err; - - if (mask_attrs & 1ULL << OVS_KEY_ATTR_ENCAP) { - __be16 eth_type = 0; - __be16 tci = 0; - - if (!encap_valid) { - OVS_NLERR("Encap mask attribute is set for non-VLAN frame.\n"); - return -EINVAL; - } - - mask_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP); - if (a[OVS_KEY_ATTR_ETHERTYPE]) - eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]); - - if (eth_type == htons(0xffff)) { - mask_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE); - encap = a[OVS_KEY_ATTR_ENCAP]; - err = parse_flow_mask_nlattrs(encap, a, &mask_attrs); - } else { - OVS_NLERR("VLAN frames must have an exact match on the TPID (mask=%x).\n", - ntohs(eth_type)); - return -EINVAL; - } - - if (a[OVS_KEY_ATTR_VLAN]) - tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]); - - if (!(tci & htons(VLAN_TAG_PRESENT))) { - OVS_NLERR("VLAN tag present bit must have an exact match (tci_mask=%x).\n", ntohs(tci)); - return -EINVAL; - } - } - - err = ovs_key_from_nlattrs(match, mask_attrs, a, true); - if (err) - return err; - } else { - /* Populate exact match flow's key mask. */ - if (match->mask) - ovs_sw_flow_mask_set(match->mask, &match->range, 0xff); - } - - if (!ovs_match_validate(match, key_attrs, mask_attrs)) - return -EINVAL; - - return 0; -} - -/** - * ovs_flow_metadata_from_nlattrs - parses Netlink attributes into a flow key. - * @flow: Receives extracted in_port, priority, tun_key and skb_mark. - * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute - * sequence. - * - * This parses a series of Netlink attributes that form a flow key, which must - * take the same form accepted by flow_from_nlattrs(), but only enough of it to - * get the metadata, that is, the parts of the flow key that cannot be - * extracted from the packet itself. - */ - -int ovs_flow_metadata_from_nlattrs(struct sw_flow *flow, - const struct nlattr *attr) -{ - struct ovs_key_ipv4_tunnel *tun_key = &flow->key.tun_key; - const struct nlattr *a[OVS_KEY_ATTR_MAX + 1]; - u64 attrs = 0; - int err; - struct sw_flow_match match; - - flow->key.phy.in_port = DP_MAX_PORTS; - flow->key.phy.priority = 0; - flow->key.phy.skb_mark = 0; - memset(tun_key, 0, sizeof(flow->key.tun_key)); - - err = parse_flow_nlattrs(attr, a, &attrs); - if (err) - return -EINVAL; - - memset(&match, 0, sizeof(match)); - match.key = &flow->key; - - err = metadata_from_nlattrs(&match, &attrs, a, false); - if (err) - return err; - - return 0; -} - -int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey, - const struct sw_flow_key *output, struct sk_buff *skb) -{ - struct ovs_key_ethernet *eth_key; - struct nlattr *nla, *encap; - bool is_mask = (swkey != output); - - if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority)) - goto nla_put_failure; - - if ((swkey->tun_key.ipv4_dst || is_mask) && - ovs_ipv4_tun_to_nlattr(skb, &swkey->tun_key, &output->tun_key)) - goto nla_put_failure; - - if (swkey->phy.in_port == DP_MAX_PORTS) { - if (is_mask && (output->phy.in_port == 0xffff)) - if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, 0xffffffff)) - goto nla_put_failure; - } else { - u16 upper_u16; - upper_u16 = !is_mask ? 0 : 0xffff; - - if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, - (upper_u16 << 16) | output->phy.in_port)) - goto nla_put_failure; - } - - if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark)) - goto nla_put_failure; - - nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key)); - if (!nla) - goto nla_put_failure; - - eth_key = nla_data(nla); - memcpy(eth_key->eth_src, output->eth.src, ETH_ALEN); - memcpy(eth_key->eth_dst, output->eth.dst, ETH_ALEN); - - if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) { - __be16 eth_type; - eth_type = !is_mask ? htons(ETH_P_8021Q) : htons(0xffff); - if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) || - nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci)) - goto nla_put_failure; - encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP); - if (!swkey->eth.tci) - goto unencap; - } else - encap = NULL; - - if (swkey->eth.type == htons(ETH_P_802_2)) { - /* - * Ethertype 802.2 is represented in the netlink with omitted - * OVS_KEY_ATTR_ETHERTYPE in the flow key attribute, and - * 0xffff in the mask attribute. Ethertype can also - * be wildcarded. - */ - if (is_mask && output->eth.type) - if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, - output->eth.type)) - goto nla_put_failure; - goto unencap; - } - - if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type)) - goto nla_put_failure; - - if (swkey->eth.type == htons(ETH_P_IP)) { - struct ovs_key_ipv4 *ipv4_key; - - nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key)); - if (!nla) - goto nla_put_failure; - ipv4_key = nla_data(nla); - ipv4_key->ipv4_src = output->ipv4.addr.src; - ipv4_key->ipv4_dst = output->ipv4.addr.dst; - ipv4_key->ipv4_proto = output->ip.proto; - ipv4_key->ipv4_tos = output->ip.tos; - ipv4_key->ipv4_ttl = output->ip.ttl; - ipv4_key->ipv4_frag = output->ip.frag; - } else if (swkey->eth.type == htons(ETH_P_IPV6)) { - struct ovs_key_ipv6 *ipv6_key; - - nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key)); - if (!nla) - goto nla_put_failure; - ipv6_key = nla_data(nla); - memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src, - sizeof(ipv6_key->ipv6_src)); - memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst, - sizeof(ipv6_key->ipv6_dst)); - ipv6_key->ipv6_label = output->ipv6.label; - ipv6_key->ipv6_proto = output->ip.proto; - ipv6_key->ipv6_tclass = output->ip.tos; - ipv6_key->ipv6_hlimit = output->ip.ttl; - ipv6_key->ipv6_frag = output->ip.frag; - } else if (swkey->eth.type == htons(ETH_P_ARP) || - swkey->eth.type == htons(ETH_P_RARP)) { - struct ovs_key_arp *arp_key; - - nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key)); - if (!nla) - goto nla_put_failure; - arp_key = nla_data(nla); - memset(arp_key, 0, sizeof(struct ovs_key_arp)); - arp_key->arp_sip = output->ipv4.addr.src; - arp_key->arp_tip = output->ipv4.addr.dst; - arp_key->arp_op = htons(output->ip.proto); - memcpy(arp_key->arp_sha, output->ipv4.arp.sha, ETH_ALEN); - memcpy(arp_key->arp_tha, output->ipv4.arp.tha, ETH_ALEN); - } - - if ((swkey->eth.type == htons(ETH_P_IP) || - swkey->eth.type == htons(ETH_P_IPV6)) && - swkey->ip.frag != OVS_FRAG_TYPE_LATER) { - - if (swkey->ip.proto == IPPROTO_TCP) { - struct ovs_key_tcp *tcp_key; - - nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key)); - if (!nla) - goto nla_put_failure; - tcp_key = nla_data(nla); - if (swkey->eth.type == htons(ETH_P_IP)) { - tcp_key->tcp_src = output->ipv4.tp.src; - tcp_key->tcp_dst = output->ipv4.tp.dst; - } else if (swkey->eth.type == htons(ETH_P_IPV6)) { - tcp_key->tcp_src = output->ipv6.tp.src; - tcp_key->tcp_dst = output->ipv6.tp.dst; - } - } else if (swkey->ip.proto == IPPROTO_UDP) { - struct ovs_key_udp *udp_key; - - nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key)); - if (!nla) - goto nla_put_failure; - udp_key = nla_data(nla); - if (swkey->eth.type == htons(ETH_P_IP)) { - udp_key->udp_src = output->ipv4.tp.src; - udp_key->udp_dst = output->ipv4.tp.dst; - } else if (swkey->eth.type == htons(ETH_P_IPV6)) { - udp_key->udp_src = output->ipv6.tp.src; - udp_key->udp_dst = output->ipv6.tp.dst; - } - } else if (swkey->ip.proto == IPPROTO_SCTP) { - struct ovs_key_sctp *sctp_key; - - nla = nla_reserve(skb, OVS_KEY_ATTR_SCTP, sizeof(*sctp_key)); - if (!nla) - goto nla_put_failure; - sctp_key = nla_data(nla); - if (swkey->eth.type == htons(ETH_P_IP)) { - sctp_key->sctp_src = swkey->ipv4.tp.src; - sctp_key->sctp_dst = swkey->ipv4.tp.dst; - } else if (swkey->eth.type == htons(ETH_P_IPV6)) { - sctp_key->sctp_src = swkey->ipv6.tp.src; - sctp_key->sctp_dst = swkey->ipv6.tp.dst; - } - } else if (swkey->eth.type == htons(ETH_P_IP) && - swkey->ip.proto == IPPROTO_ICMP) { - struct ovs_key_icmp *icmp_key; - - nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key)); - if (!nla) - goto nla_put_failure; - icmp_key = nla_data(nla); - icmp_key->icmp_type = ntohs(output->ipv4.tp.src); - icmp_key->icmp_code = ntohs(output->ipv4.tp.dst); - } else if (swkey->eth.type == htons(ETH_P_IPV6) && - swkey->ip.proto == IPPROTO_ICMPV6) { - struct ovs_key_icmpv6 *icmpv6_key; - - nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6, - sizeof(*icmpv6_key)); - if (!nla) - goto nla_put_failure; - icmpv6_key = nla_data(nla); - icmpv6_key->icmpv6_type = ntohs(output->ipv6.tp.src); - icmpv6_key->icmpv6_code = ntohs(output->ipv6.tp.dst); - - if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION || - icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) { - struct ovs_key_nd *nd_key; - - nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key)); - if (!nla) - goto nla_put_failure; - nd_key = nla_data(nla); - memcpy(nd_key->nd_target, &output->ipv6.nd.target, - sizeof(nd_key->nd_target)); - memcpy(nd_key->nd_sll, output->ipv6.nd.sll, ETH_ALEN); - memcpy(nd_key->nd_tll, output->ipv6.nd.tll, ETH_ALEN); - } - } - } - -unencap: - if (encap) - nla_nest_end(skb, encap); - - return 0; - -nla_put_failure: - return -EMSGSIZE; -} - -/* Initializes the flow module. - * Returns zero if successful or a negative error code. */ -int ovs_flow_init(void) -{ - BUILD_BUG_ON(__alignof__(struct sw_flow_key) % __alignof__(long)); - BUILD_BUG_ON(sizeof(struct sw_flow_key) % sizeof(long)); - - flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow), 0, - 0, NULL); - if (flow_cache == NULL) - return -ENOMEM; - - return 0; -} - -/* Uninitializes the flow module. */ -void ovs_flow_exit(void) -{ - kmem_cache_destroy(flow_cache); -} - -struct sw_flow_mask *ovs_sw_flow_mask_alloc(void) -{ - struct sw_flow_mask *mask; - - mask = kmalloc(sizeof(*mask), GFP_KERNEL); - if (mask) - mask->ref_count = 0; - - return mask; -} - -void ovs_sw_flow_mask_add_ref(struct sw_flow_mask *mask) -{ - mask->ref_count++; -} - -void ovs_sw_flow_mask_del_ref(struct sw_flow_mask *mask, bool deferred) -{ - if (!mask) - return; - - BUG_ON(!mask->ref_count); - mask->ref_count--; - - if (!mask->ref_count) { - list_del_rcu(&mask->list); - if (deferred) - kfree_rcu(mask, rcu); - else - kfree(mask); - } -} - -static bool ovs_sw_flow_mask_equal(const struct sw_flow_mask *a, - const struct sw_flow_mask *b) -{ - u8 *a_ = (u8 *)&a->key + a->range.start; - u8 *b_ = (u8 *)&b->key + b->range.start; - - return (a->range.end == b->range.end) - && (a->range.start == b->range.start) - && (memcmp(a_, b_, range_n_bytes(&a->range)) == 0); -} - -struct sw_flow_mask *ovs_sw_flow_mask_find(const struct flow_table *tbl, - const struct sw_flow_mask *mask) -{ - struct list_head *ml; - - list_for_each(ml, tbl->mask_list) { - struct sw_flow_mask *m; - m = container_of(ml, struct sw_flow_mask, list); - if (ovs_sw_flow_mask_equal(mask, m)) - return m; - } - - return NULL; -} - -/** - * add a new mask into the mask list. - * The caller needs to make sure that 'mask' is not the same - * as any masks that are already on the list. - */ -void ovs_sw_flow_mask_insert(struct flow_table *tbl, struct sw_flow_mask *mask) -{ - list_add_rcu(&mask->list, tbl->mask_list); -} - -/** - * Set 'range' fields in the mask to the value of 'val'. - */ -static void ovs_sw_flow_mask_set(struct sw_flow_mask *mask, - struct sw_flow_key_range *range, u8 val) -{ - u8 *m = (u8 *)&mask->key + range->start; - - mask->range = *range; - memset(m, val, range_n_bytes(range)); -} |
