diff --git a/datapath/README b/datapath/README index 8fa2dd1e7..37c20ee24 100644 --- a/datapath/README +++ b/datapath/README @@ -91,6 +91,46 @@ Often we ellipsize arguments not important to the discussion, e.g.: in_port(1), eth(...), eth_type(0x0800), ipv4(...), tcp(...) +Wildcarded flow key format +-------------------------- + +A wildcarded flow is described with two sequences of Netlink attributes +passed over the Netlink socket. A flow key, exactly as described above, and an +optional corresponding flow mask. + +A wildcarded flow can represent a group of exact match flows. Each '1' bit +in the mask specifies a exact match with the corresponding bit in the flow key. +A '0' bit specifies a don't care bit, which will match either a '1' or '0' bit +of a incoming packet. Using wildcarded flow can improve the flow set up rate +by reduce the number of new flows need to be processed by the user space program. + +Support for the mask Netlink attribute is optional for both the kernel and user +space program. The kernel can ignore the mask attribute, installing an exact +match flow, or reduce the number of don't care bits in the kernel to less than +what was specified by the user space program. In this case, variations in bits +that the kernel does not implement will simply result in additional flow setups. +The kernel module will also work with user space programs that neither support +nor supply flow mask attributes. + +Since the kernel may ignore or modify wildcard bits, it can be difficult for +the userspace program to know exactly what matches are installed. There are +two possible approaches: reactively install flows as they miss the kernel +flow table (and therefore not attempt to determine wildcard changes at all) +or use the kernel's response messages to determine the installed wildcards. + +When interacting with userspace, the kernel should maintain the match portion +of the key exactly as originally installed. This will provides a handle to +identify the flow for all future operations. However, when reporting the +mask of an installed flow, the mask should include any restrictions imposed +by the kernel. + +The behavior when using overlapping wildcarded flows is undefined. It is the +responsibility of the user space program to ensure that any incoming packet +can match at most one flow, wildcarded or not. The current implementation +performs best-effort detection of overlapping wildcarded flows and may reject +some but not all of them. However, this behavior may change in future versions. + + Basic rule for evolving flow keys --------------------------------- diff --git a/datapath/datapath.c b/datapath/datapath.c index 42af31588..ee3d5e4d4 100644 --- a/datapath/datapath.c +++ b/datapath/datapath.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2007-2012 Nicira, Inc. + * Copyright (c) 2007-2013 Nicira, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public @@ -173,7 +173,7 @@ static void destroy_dp_rcu(struct rcu_head *rcu) { struct datapath *dp = container_of(rcu, struct datapath, rcu); - ovs_flow_tbl_destroy((__force struct flow_table *)dp->table); + ovs_flow_tbl_destroy((__force struct flow_table *)dp->table, false); free_percpu(dp->stats_percpu); release_net(ovs_dp_get_net(dp)); kfree(dp->ports); @@ -234,19 +234,18 @@ void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) struct sw_flow_key key; u64 *stats_counter; int error; - int key_len; stats = this_cpu_ptr(dp->stats_percpu); /* Extract flow from 'skb' into 'key'. */ - error = ovs_flow_extract(skb, p->port_no, &key, &key_len); + error = ovs_flow_extract(skb, p->port_no, &key); if (unlikely(error)) { kfree_skb(skb); return; } /* Look up flow. */ - flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len); + flow = ovs_flow_lookup(rcu_dereference(dp->table), &key); if (unlikely(!flow)) { struct dp_upcall_info upcall; @@ -443,7 +442,7 @@ static int queue_userspace_packet(struct net *net, int dp_ifindex, upcall->dp_ifindex = dp_ifindex; nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); - ovs_flow_to_nlattrs(upcall_info->key, user_skb); + ovs_flow_to_nlattrs(upcall_info->key, upcall_info->key, user_skb); nla_nest_end(user_skb, nla); if (upcall_info->userdata) @@ -476,7 +475,7 @@ static int flush_flows(struct datapath *dp) rcu_assign_pointer(dp->table, new_table); - ovs_flow_tbl_deferred_destroy(old_table); + ovs_flow_tbl_destroy(old_table, true); return 0; } @@ -619,10 +618,12 @@ static int validate_tp_port(const struct sw_flow_key *flow_key) static int validate_and_copy_set_tun(const struct nlattr *attr, struct sw_flow_actions **sfa) { - struct ovs_key_ipv4_tunnel tun_key; + struct sw_flow_match match; + struct sw_flow_key key; int err, start; - err = ipv4_tun_from_nlattr(nla_data(attr), &tun_key); + ovs_match_init(&match, &key, NULL); + err = ipv4_tun_from_nlattr(nla_data(attr), &match, false); if (err) return err; @@ -630,7 +631,8 @@ static int validate_and_copy_set_tun(const struct nlattr *attr, if (start < 0) return start; - err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &tun_key, sizeof(tun_key)); + err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &match.key->tun_key, + sizeof(match.key->tun_key)); add_nested_action_end(*sfa, start); return err; @@ -871,7 +873,6 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) struct ethhdr *eth; int len; int err; - int key_len; err = -EINVAL; if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || @@ -904,11 +905,11 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) if (IS_ERR(flow)) goto err_kfree_skb; - err = ovs_flow_extract(packet, -1, &flow->key, &key_len); + err = ovs_flow_extract(packet, -1, &flow->key); if (err) goto err_flow_free; - err = ovs_flow_metadata_from_nlattrs(flow, key_len, a[OVS_PACKET_ATTR_KEY]); + err = ovs_flow_metadata_from_nlattrs(flow, a[OVS_PACKET_ATTR_KEY]); if (err) goto err_flow_free; acts = ovs_flow_actions_alloc(nla_len(a[OVS_PACKET_ATTR_ACTIONS])); @@ -936,13 +937,13 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) local_bh_enable(); rcu_read_unlock(); - ovs_flow_free(flow); + ovs_flow_free(flow, false); return err; err_unlock: rcu_read_unlock(); err_flow_free: - ovs_flow_free(flow); + ovs_flow_free(flow, false); err_kfree_skb: kfree_skb(packet); err: @@ -1061,7 +1062,8 @@ static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb) if (!start) return -EMSGSIZE; - err = ipv4_tun_to_nlattr(skb, nla_data(ovs_key)); + err = ipv4_tun_to_nlattr(skb, + nla_data(ovs_key), nla_data(ovs_key)); if (err) return err; nla_nest_end(skb, start); @@ -1109,6 +1111,7 @@ static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts) { return NLMSG_ALIGN(sizeof(struct ovs_header)) + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */ + + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */ + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ + nla_total_size(8) /* OVS_FLOW_ATTR_USED */ @@ -1138,14 +1141,28 @@ static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, ovs_header->dp_ifindex = get_dpifindex(dp); + /* Fill flow key. */ nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); if (!nla) goto nla_put_failure; - err = ovs_flow_to_nlattrs(&flow->key, skb); + + err = ovs_flow_to_nlattrs(&flow->unmasked_key, + &flow->unmasked_key, skb); if (err) goto error; nla_nest_end(skb, nla); + nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK); + if (!nla) + goto nla_put_failure; + + err = ovs_flow_to_nlattrs(&flow->key, + &ovsl_dereference(flow->mask)->key, skb); + if (err) + goto error; + + nla_nest_end(skb, nla); + spin_lock_bh(&flow->lock); used = flow->used; stats.n_packets = flow->packet_count; @@ -1229,19 +1246,23 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) struct nlattr **a = info->attrs; struct ovs_header *ovs_header = info->userhdr; struct sw_flow_key key; - struct sw_flow *flow; + struct sw_flow *flow = NULL; + struct sw_flow_mask mask; struct sk_buff *reply; struct datapath *dp; struct flow_table *table; struct sw_flow_actions *acts = NULL; + struct sw_flow_match match; int error; - int key_len; /* Extract key. */ error = -EINVAL; if (!a[OVS_FLOW_ATTR_KEY]) goto error; - error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); + + ovs_match_init(&match, &key, &mask); + error = ovs_match_from_nlattrs(&match, + a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]); if (error) goto error; @@ -1267,8 +1288,11 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) goto err_unlock_ovs; table = ovsl_dereference(dp->table); - flow = ovs_flow_tbl_lookup(table, &key, key_len); + + /* Check if this is a duplicate flow */ + flow = ovs_flow_lookup(table, &key); if (!flow) { + struct sw_flow_mask *mask_p; /* Bail out if we're not allowed to create a new flow. */ error = -ENOENT; if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) @@ -1281,7 +1305,7 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) new_table = ovs_flow_tbl_expand(table); if (!IS_ERR(new_table)) { rcu_assign_pointer(dp->table, new_table); - ovs_flow_tbl_deferred_destroy(table); + ovs_flow_tbl_destroy(table, true); table = ovsl_dereference(dp->table); } } @@ -1294,18 +1318,37 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) } clear_stats(flow); + /* Make sure mask is unique in the system */ + mask_p = ovs_sw_flow_mask_find(table, &mask); + if (!mask_p) { + /* Allocate a new mask if none exsits. */ + mask_p = ovs_sw_flow_mask_alloc(); + if (!mask_p) + goto err_flow_free; + mask_p->key = mask.key; + mask_p->range = mask.range; + ovs_sw_flow_mask_insert(table, mask_p); + } + + ovs_sw_flow_mask_add_ref(mask_p); + rcu_assign_pointer(flow->mask, mask_p); rcu_assign_pointer(flow->sf_acts, acts); /* Put flow in bucket. */ - ovs_flow_tbl_insert(table, flow, &key, key_len); + ovs_flow_insert(table, flow, &key, match.range.end); reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, - info->snd_seq, - OVS_FLOW_CMD_NEW); + info->snd_seq, OVS_FLOW_CMD_NEW); } else { /* We found a matching flow. */ struct sw_flow_actions *old_acts; + /* Make sure the it has the same unmasked key. */ + if (!ovs_flow_cmp_unmasked_key(flow, &key, match.range.end)) { + error = -EINVAL; + goto err_unlock_ovs; + } + /* Bail out if we're not allowed to modify an existing flow. * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL * because Generic Netlink treats the latter as a dump @@ -1341,6 +1384,8 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) ovs_dp_flow_multicast_group.id, PTR_ERR(reply)); return 0; +err_flow_free: + ovs_flow_free(flow, false); err_unlock_ovs: ovs_unlock(); err_kfree: @@ -1358,12 +1403,14 @@ static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) struct sw_flow *flow; struct datapath *dp; struct flow_table *table; + struct sw_flow_match match; int err; - int key_len; if (!a[OVS_FLOW_ATTR_KEY]) return -EINVAL; - err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); + + ovs_match_init(&match, &key, NULL); + err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL); if (err) return err; @@ -1375,7 +1422,7 @@ static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) } table = ovsl_dereference(dp->table); - flow = ovs_flow_tbl_lookup(table, &key, key_len); + flow = ovs_flow_lookup_unmasked_key(table, &match); if (!flow) { err = -ENOENT; goto unlock; @@ -1404,8 +1451,8 @@ static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) struct sw_flow *flow; struct datapath *dp; struct flow_table *table; + struct sw_flow_match match; int err; - int key_len; ovs_lock(); dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); @@ -1418,12 +1465,14 @@ static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) err = flush_flows(dp); goto unlock; } - err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); + + ovs_match_init(&match, &key, NULL); + err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL); if (err) goto unlock; table = ovsl_dereference(dp->table); - flow = ovs_flow_tbl_lookup(table, &key, key_len); + flow = ovs_flow_lookup_unmasked_key(table, &match); if (!flow) { err = -ENOENT; goto unlock; @@ -1435,13 +1484,13 @@ static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) goto unlock; } - ovs_flow_tbl_remove(table, flow); + ovs_flow_remove(table, flow); err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid, info->snd_seq, 0, OVS_FLOW_CMD_DEL); BUG_ON(err < 0); - ovs_flow_deferred_free(flow); + ovs_flow_free(flow, true); ovs_unlock(); ovs_notify(reply, info, &ovs_dp_flow_multicast_group); @@ -1472,7 +1521,7 @@ static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) bucket = cb->args[0]; obj = cb->args[1]; - flow = ovs_flow_tbl_next(table, &bucket, &obj); + flow = ovs_flow_dump_next(table, &bucket, &obj); if (!flow) break; @@ -1705,7 +1754,7 @@ err_destroy_ports_array: err_destroy_percpu: free_percpu(dp->stats_percpu); err_destroy_table: - ovs_flow_tbl_destroy(ovsl_dereference(dp->table)); + ovs_flow_tbl_destroy(ovsl_dereference(dp->table), false); err_free_dp: release_net(ovs_dp_get_net(dp)); kfree(dp); @@ -2357,7 +2406,7 @@ static void rehash_flow_table(struct work_struct *work) new_table = ovs_flow_tbl_rehash(old_table); if (!IS_ERR(new_table)) { rcu_assign_pointer(dp->table, new_table); - ovs_flow_tbl_deferred_destroy(old_table); + ovs_flow_tbl_destroy(old_table, true); } } } diff --git a/datapath/flow.c b/datapath/flow.c index 7604405c5..79d5d495a 100644 --- a/datapath/flow.c +++ b/datapath/flow.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2007-2011 Nicira, Inc. + * Copyright (c) 2007-2013 Nicira, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public @@ -47,6 +47,175 @@ 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) +{ + struct sw_flow_key_range *range = NULL; + size_t start = offset; + size_t end = offset + size; + + 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; + + if (range->end < end) + range->end = end; +} + +#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 && match->mask != NULL) { \ + (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 && match->mask != NULL) { \ + memcpy(&(match)->mask->key.field, value_p, len); \ + } else { \ + memcpy(&(match)->key->field, value_p, len); \ + } \ + } while (0) + +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; + + 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) +{ + u64 key_expected = 1ULL << 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 &= ~((1ULL << OVS_KEY_ATTR_IPV4) + | (1ULL << OVS_KEY_ATTR_IPV6) + | (1ULL << OVS_KEY_ATTR_TCP) + | (1ULL << OVS_KEY_ATTR_UDP) + | (1ULL << OVS_KEY_ATTR_ICMP) + | (1ULL << OVS_KEY_ATTR_ICMPV6) + | (1ULL << OVS_KEY_ATTR_ARP) + | (1ULL << OVS_KEY_ATTR_ND)); + + if (match->key->eth.type == htons(ETH_P_802_2) && + match->mask && (match->mask->key.eth.type == htons(0xffff))) + mask_allowed |= (1ULL << 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 |= 1ULL << OVS_KEY_ATTR_ARP; + if (match->mask && (match->mask->key.eth.type == htons(0xffff))) + mask_allowed |= 1ULL << OVS_KEY_ATTR_ARP; + } + + if (match->key->eth.type == htons(ETH_P_IP)) { + key_expected |= 1ULL << OVS_KEY_ATTR_IPV4; + if (match->mask && (match->mask->key.eth.type == htons(0xffff))) + mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV4; + + if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) { + if (match->key->ip.proto == IPPROTO_UDP) { + key_expected |= 1ULL << OVS_KEY_ATTR_UDP; + if (match->mask && (match->mask->key.ip.proto == 0xff)) + mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP; + } + + if (match->key->ip.proto == IPPROTO_TCP) { + key_expected |= 1ULL << OVS_KEY_ATTR_TCP; + if (match->mask && (match->mask->key.ip.proto == 0xff)) + mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP; + } + + if (match->key->ip.proto == IPPROTO_ICMP) { + key_expected |= 1ULL << OVS_KEY_ATTR_ICMP; + if (match->mask && (match->mask->key.ip.proto == 0xff)) + mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMP; + } + } + } + + if (match->key->eth.type == htons(ETH_P_IPV6)) { + key_expected |= 1ULL << OVS_KEY_ATTR_IPV6; + if (match->mask && (match->mask->key.eth.type == htons(0xffff))) + mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV6; + + if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) { + if (match->key->ip.proto == IPPROTO_UDP) { + key_expected |= 1ULL << OVS_KEY_ATTR_UDP; + if (match->mask && (match->mask->key.ip.proto == 0xff)) + mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP; + } + + if (match->key->ip.proto == IPPROTO_TCP) { + key_expected |= 1ULL << OVS_KEY_ATTR_TCP; + if (match->mask && (match->mask->key.ip.proto == 0xff)) + mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP; + } + + if (match->key->ip.proto == IPPROTO_ICMPV6) { + key_expected |= 1ULL << OVS_KEY_ATTR_ICMPV6; + if (match->mask && (match->mask->key.ip.proto == 0xff)) + mask_allowed |= 1ULL << 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 |= 1ULL << OVS_KEY_ATTR_ND; + if (match->mask && (match->mask->key.ipv6.tp.src == htons(0xffff))) + mask_allowed |= 1ULL << OVS_KEY_ATTR_ND; + } + } + } + } + + if ((key_attrs & key_expected) != key_expected) + /* Key attributes check failed. */ + return false; + + if ((mask_attrs & mask_allowed) != mask_attrs) + /* Mask attributes check failed. */ + return false; + + return true; +} + static int check_header(struct sk_buff *skb, int len) { if (unlikely(skb->len < len)) @@ -122,12 +291,7 @@ u64 ovs_flow_used_time(unsigned long flow_jiffies) return cur_ms - idle_ms; } -#define SW_FLOW_KEY_OFFSET(field) \ - (offsetof(struct sw_flow_key, field) + \ - FIELD_SIZEOF(struct sw_flow_key, field)) - -static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key, - int *key_lenp) +static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key) { unsigned int nh_ofs = skb_network_offset(skb); unsigned int nh_len; @@ -137,8 +301,6 @@ static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key, __be16 frag_off; int err; - *key_lenp = SW_FLOW_KEY_OFFSET(ipv6.label); - err = check_header(skb, nh_ofs + sizeof(*nh)); if (unlikely(err)) return err; @@ -177,6 +339,22 @@ static bool icmp6hdr_ok(struct sk_buff *skb) sizeof(struct icmp6hdr)); } +static void flow_key_mask(struct sw_flow_key *dst, + const struct sw_flow_key *src, + const struct sw_flow_mask *mask) +{ + u8 *m = (u8 *)&mask->key + mask->range.start; + u8 *s = (u8 *)src + mask->range.start; + u8 *d = (u8 *)dst + mask->range.start; + int i; + + memset(dst, 0, sizeof(*dst)); + for (i = 0; i < ovs_sw_flow_mask_size_roundup(mask); i++) { + *d = *s & *m; + d++, s++, m++; + } +} + #define TCP_FLAGS_OFFSET 13 #define TCP_FLAG_MASK 0x3f @@ -225,6 +403,7 @@ struct sw_flow *ovs_flow_alloc(void) spin_lock_init(&flow->lock); flow->sf_acts = NULL; + flow->mask = NULL; return flow; } @@ -282,17 +461,15 @@ struct flow_table *ovs_flow_tbl_alloc(int new_size) table->node_ver = 0; table->keep_flows = false; get_random_bytes(&table->hash_seed, sizeof(u32)); + INIT_LIST_HEAD(&table->mask_list); return table; } -void ovs_flow_tbl_destroy(struct flow_table *table) +static void __flow_tbl_destroy(struct flow_table *table) { int i; - if (!table) - return; - if (table->keep_flows) goto skip_flows; @@ -304,7 +481,7 @@ void ovs_flow_tbl_destroy(struct flow_table *table) hlist_for_each_entry_safe(flow, n, head, hash_node[ver]) { hlist_del_rcu(&flow->hash_node[ver]); - ovs_flow_free(flow); + ovs_flow_free(flow, false); } } @@ -317,18 +494,21 @@ static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu) { struct flow_table *table = container_of(rcu, struct flow_table, rcu); - ovs_flow_tbl_destroy(table); + __flow_tbl_destroy(table); } -void ovs_flow_tbl_deferred_destroy(struct flow_table *table) +void ovs_flow_tbl_destroy(struct flow_table *table, bool deferred) { if (!table) return; - call_rcu(&table->rcu, flow_tbl_destroy_rcu_cb); + if (deferred) + call_rcu(&table->rcu, flow_tbl_destroy_rcu_cb); + else + __flow_tbl_destroy(table); } -struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *last) +struct sw_flow *ovs_flow_dump_next(struct flow_table *table, u32 *bucket, u32 *last) { struct sw_flow *flow; struct hlist_head *head; @@ -354,11 +534,13 @@ struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *la return NULL; } -static void __flow_tbl_insert(struct flow_table *table, struct sw_flow *flow) +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++; } @@ -378,8 +560,10 @@ static void flow_table_copy_flows(struct flow_table *old, struct flow_table *new head = flex_array_get(old->buckets, i); hlist_for_each_entry(flow, head, hash_node[old_ver]) - __flow_tbl_insert(new, flow); + __tbl_insert(new, flow); } + + new->mask_list = old->mask_list; old->keep_flows = true; } @@ -406,28 +590,31 @@ struct flow_table *ovs_flow_tbl_expand(struct flow_table *table) return __flow_tbl_rehash(table, table->n_buckets * 2); } -void ovs_flow_free(struct sw_flow *flow) +static void __flow_free(struct sw_flow *flow) { - if (unlikely(!flow)) - return; - kfree((struct sf_flow_acts __force *)flow->sf_acts); kmem_cache_free(flow_cache, flow); } -/* RCU callback used by ovs_flow_deferred_free. */ static void rcu_free_flow_callback(struct rcu_head *rcu) { struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu); - ovs_flow_free(flow); + __flow_free(flow); } -/* Schedules 'flow' 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(struct sw_flow *flow) +void ovs_flow_free(struct sw_flow *flow, bool deferred) { - call_rcu(&flow->rcu, rcu_free_flow_callback); + if (!flow) + return; + + ovs_sw_flow_mask_del_ref((struct sw_flow_mask __force *)flow->mask, + deferred); + + if (deferred) + call_rcu(&flow->rcu, rcu_free_flow_callback); + else + __flow_free(flow); } /* RCU callback used by ovs_flow_deferred_free_acts. */ @@ -506,18 +693,15 @@ static __be16 parse_ethertype(struct sk_buff *skb) } static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key, - int *key_lenp, int nh_len) + int nh_len) { struct icmp6hdr *icmp = icmp6_hdr(skb); - int error = 0; - int key_len; /* The ICMPv6 type and code fields use the 16-bit transport port * fields, so we need to store them in 16-bit network byte order. */ key->ipv6.tp.src = htons(icmp->icmp6_type); key->ipv6.tp.dst = htons(icmp->icmp6_code); - key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); if (icmp->icmp6_code == 0 && (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION || @@ -526,21 +710,17 @@ static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key, struct nd_msg *nd; int offset; - key_len = SW_FLOW_KEY_OFFSET(ipv6.nd); - /* In order to process neighbor discovery options, we need the * entire packet. */ if (unlikely(icmp_len < sizeof(*nd))) - goto out; - if (unlikely(skb_linearize(skb))) { - error = -ENOMEM; - goto out; - } + return 0; + + if (unlikely(skb_linearize(skb))) + return -ENOMEM; nd = (struct nd_msg *)skb_transport_header(skb); key->ipv6.nd.target = nd->target; - key_len = SW_FLOW_KEY_OFFSET(ipv6.nd); icmp_len -= sizeof(*nd); offset = 0; @@ -550,7 +730,7 @@ static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key, int opt_len = nd_opt->nd_opt_len * 8; if (unlikely(!opt_len || opt_len > icmp_len)) - goto invalid; + return 0; /* Store the link layer address if the appropriate * option is provided. It is considered an error if @@ -575,16 +755,14 @@ static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key, } } - goto out; + return 0; invalid: memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target)); memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll)); memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll)); -out: - *key_lenp = key_len; - return error; + return 0; } /** @@ -611,11 +789,9 @@ out: * of a correct length, otherwise the same as skb->network_header. * For other key->eth.type values it is left untouched. */ -int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key, - int *key_lenp) +int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key) { - int error = 0; - int key_len = SW_FLOW_KEY_OFFSET(eth); + int error; struct ethhdr *eth; memset(key, 0, sizeof(*key)); @@ -657,15 +833,13 @@ int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key, struct iphdr *nh; __be16 offset; - key_len = SW_FLOW_KEY_OFFSET(ipv4.addr); - error = check_iphdr(skb); if (unlikely(error)) { if (error == -EINVAL) { skb->transport_header = skb->network_header; error = 0; } - goto out; + return error; } nh = ip_hdr(skb); @@ -679,7 +853,7 @@ int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key, offset = nh->frag_off & htons(IP_OFFSET); if (offset) { key->ip.frag = OVS_FRAG_TYPE_LATER; - goto out; + return 0; } if (nh->frag_off & htons(IP_MF) || skb_shinfo(skb)->gso_type & SKB_GSO_UDP) @@ -687,21 +861,18 @@ int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key, /* Transport layer. */ if (key->ip.proto == IPPROTO_TCP) { - key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); if (tcphdr_ok(skb)) { struct tcphdr *tcp = tcp_hdr(skb); key->ipv4.tp.src = tcp->source; key->ipv4.tp.dst = tcp->dest; } } else if (key->ip.proto == IPPROTO_UDP) { - key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); if (udphdr_ok(skb)) { struct udphdr *udp = udp_hdr(skb); key->ipv4.tp.src = udp->source; key->ipv4.tp.dst = udp->dest; } } else if (key->ip.proto == IPPROTO_ICMP) { - key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); if (icmphdr_ok(skb)) { struct icmphdr *icmp = icmp_hdr(skb); /* The ICMP type and code fields use the 16-bit @@ -730,53 +901,49 @@ int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key, memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst)); memcpy(key->ipv4.arp.sha, arp->ar_sha, ETH_ALEN); memcpy(key->ipv4.arp.tha, arp->ar_tha, ETH_ALEN); - key_len = SW_FLOW_KEY_OFFSET(ipv4.arp); } } else if (key->eth.type == htons(ETH_P_IPV6)) { int nh_len; /* IPv6 Header + Extensions */ - nh_len = parse_ipv6hdr(skb, key, &key_len); + nh_len = parse_ipv6hdr(skb, key); if (unlikely(nh_len < 0)) { - if (nh_len == -EINVAL) + if (nh_len == -EINVAL) { skb->transport_header = skb->network_header; - else + error = 0; + } else { error = nh_len; - goto out; + } + return error; } if (key->ip.frag == OVS_FRAG_TYPE_LATER) - goto out; + return 0; if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) key->ip.frag = OVS_FRAG_TYPE_FIRST; /* Transport layer. */ if (key->ip.proto == NEXTHDR_TCP) { - key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); if (tcphdr_ok(skb)) { struct tcphdr *tcp = tcp_hdr(skb); key->ipv6.tp.src = tcp->source; key->ipv6.tp.dst = tcp->dest; } } else if (key->ip.proto == NEXTHDR_UDP) { - key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); if (udphdr_ok(skb)) { struct udphdr *udp = udp_hdr(skb); key->ipv6.tp.src = udp->source; key->ipv6.tp.dst = udp->dest; } } else if (key->ip.proto == NEXTHDR_ICMP) { - key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); if (icmp6hdr_ok(skb)) { - error = parse_icmpv6(skb, key, &key_len, nh_len); - if (error < 0) - goto out; + error = parse_icmpv6(skb, key, nh_len); + if (error) + return error; } } } -out: - *key_lenp = key_len; - return error; + return 0; } static u32 ovs_flow_hash(const struct sw_flow_key *key, int key_start, int key_len) @@ -785,7 +952,7 @@ static u32 ovs_flow_hash(const struct sw_flow_key *key, int key_start, int key_l DIV_ROUND_UP(key_len - key_start, sizeof(u32)), 0); } -static int flow_key_start(struct sw_flow_key *key) +static int flow_key_start(const struct sw_flow_key *key) { if (key->tun_key.ipv4_dst) return 0; @@ -793,39 +960,98 @@ static int flow_key_start(struct sw_flow_key *key) return offsetof(struct sw_flow_key, phy); } -struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table, - struct sw_flow_key *key, int key_len) +static bool __cmp_key(const struct sw_flow_key *key1, + const struct sw_flow_key *key2, int key_start, int key_len) +{ + return !memcmp((u8 *)key1 + key_start, + (u8 *)key2 + key_start, (key_len - key_start)); +} + +static bool __flow_cmp_key(const struct sw_flow *flow, + const struct sw_flow_key *key, int key_start, int key_len) +{ + return __cmp_key(&flow->key, key, key_start, key_len); +} + +static bool __flow_cmp_unmasked_key(const struct sw_flow *flow, + const struct sw_flow_key *key, int key_start, int key_len) +{ + return __cmp_key(&flow->unmasked_key, key, key_start, key_len); +} + +bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow, + const struct sw_flow_key *key, int key_len) +{ + int key_start; + key_start = flow_key_start(key); + + return __flow_cmp_unmasked_key(flow, key, key_start, key_len); + +} + +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_len = match->range.end; + struct sw_flow *flow; + + flow = ovs_flow_lookup(table, unmasked); + if (flow && (!ovs_flow_cmp_unmasked_key(flow, unmasked, key_len))) + flow = NULL; + + return flow; +} + +static struct sw_flow *ovs_masked_flow_lookup(struct flow_table *table, + const struct sw_flow_key *flow_key, + struct sw_flow_mask *mask) { struct sw_flow *flow; struct hlist_head *head; - u8 *_key; - int key_start; + int key_start = mask->range.start; + int key_len = mask->range.end; u32 hash; + struct sw_flow_key masked_key; - key_start = flow_key_start(key); - hash = ovs_flow_hash(key, key_start, key_len); - - _key = (u8 *) key + key_start; + flow_key_mask(&masked_key, flow_key, mask); + hash = ovs_flow_hash(&masked_key, key_start, key_len); head = find_bucket(table, hash); hlist_for_each_entry_rcu(flow, head, hash_node[table->node_ver]) { - - if (flow->hash == hash && - !memcmp((u8 *)&flow->key + key_start, _key, key_len - key_start)) { + if (__flow_cmp_key(flow, &masked_key, key_start, key_len)) return flow; - } } return NULL; } -void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow, - struct sw_flow_key *key, int key_len) +struct sw_flow *ovs_flow_lookup(struct flow_table *tbl, + const struct sw_flow_key *key) { - flow->hash = ovs_flow_hash(key, flow_key_start(key), key_len); - memcpy(&flow->key, key, sizeof(flow->key)); - __flow_tbl_insert(table, flow); + 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_tbl_remove(struct flow_table *table, struct sw_flow *flow) + +void ovs_flow_insert(struct flow_table *table, struct sw_flow *flow, + const struct sw_flow_key *key, int key_len) +{ + flow->unmasked_key = *key; + flow_key_mask(&flow->key, &flow->unmasked_key, ovsl_dereference(flow->mask)); + flow->hash = ovs_flow_hash(&flow->key, + ovsl_dereference(flow->mask)->range.start, + ovsl_dereference(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]); @@ -852,120 +1078,29 @@ const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = { [OVS_KEY_ATTR_TUNNEL] = -1, }; -static int ipv4_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_len, - const struct nlattr *a[], u64 *attrs) +static bool is_all_zero(const u8 *fp, size_t size) { - const struct ovs_key_icmp *icmp_key; - const struct ovs_key_tcp *tcp_key; - const struct ovs_key_udp *udp_key; + int i; - switch (swkey->ip.proto) { - case IPPROTO_TCP: - if (!(*attrs & (1 << OVS_KEY_ATTR_TCP))) - return -EINVAL; - *attrs &= ~(1 << OVS_KEY_ATTR_TCP); + if (!fp) + return false; - *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); - tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]); - swkey->ipv4.tp.src = tcp_key->tcp_src; - swkey->ipv4.tp.dst = tcp_key->tcp_dst; - break; + for (i = 0; i < size; i++) + if (fp[i]) + return false; - case IPPROTO_UDP: - if (!(*attrs & (1 << OVS_KEY_ATTR_UDP))) - return -EINVAL; - *attrs &= ~(1 << OVS_KEY_ATTR_UDP); - - *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); - udp_key = nla_data(a[OVS_KEY_ATTR_UDP]); - swkey->ipv4.tp.src = udp_key->udp_src; - swkey->ipv4.tp.dst = udp_key->udp_dst; - break; - - case IPPROTO_ICMP: - if (!(*attrs & (1 << OVS_KEY_ATTR_ICMP))) - return -EINVAL; - *attrs &= ~(1 << OVS_KEY_ATTR_ICMP); - - *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp); - icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]); - swkey->ipv4.tp.src = htons(icmp_key->icmp_type); - swkey->ipv4.tp.dst = htons(icmp_key->icmp_code); - break; - } - - return 0; + return true; } -static int ipv6_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_len, - const struct nlattr *a[], u64 *attrs) -{ - const struct ovs_key_icmpv6 *icmpv6_key; - const struct ovs_key_tcp *tcp_key; - const struct ovs_key_udp *udp_key; - - switch (swkey->ip.proto) { - case IPPROTO_TCP: - if (!(*attrs & (1 << OVS_KEY_ATTR_TCP))) - return -EINVAL; - *attrs &= ~(1 << OVS_KEY_ATTR_TCP); - - *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); - tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]); - swkey->ipv6.tp.src = tcp_key->tcp_src; - swkey->ipv6.tp.dst = tcp_key->tcp_dst; - break; - - case IPPROTO_UDP: - if (!(*attrs & (1 << OVS_KEY_ATTR_UDP))) - return -EINVAL; - *attrs &= ~(1 << OVS_KEY_ATTR_UDP); - - *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); - udp_key = nla_data(a[OVS_KEY_ATTR_UDP]); - swkey->ipv6.tp.src = udp_key->udp_src; - swkey->ipv6.tp.dst = udp_key->udp_dst; - break; - - case IPPROTO_ICMPV6: - if (!(*attrs & (1 << OVS_KEY_ATTR_ICMPV6))) - return -EINVAL; - *attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6); - - *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp); - icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]); - swkey->ipv6.tp.src = htons(icmpv6_key->icmpv6_type); - swkey->ipv6.tp.dst = htons(icmpv6_key->icmpv6_code); - - if (swkey->ipv6.tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) || - swkey->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) { - const struct ovs_key_nd *nd_key; - - if (!(*attrs & (1 << OVS_KEY_ATTR_ND))) - return -EINVAL; - *attrs &= ~(1 << OVS_KEY_ATTR_ND); - - *key_len = SW_FLOW_KEY_OFFSET(ipv6.nd); - nd_key = nla_data(a[OVS_KEY_ATTR_ND]); - memcpy(&swkey->ipv6.nd.target, nd_key->nd_target, - sizeof(swkey->ipv6.nd.target)); - memcpy(swkey->ipv6.nd.sll, nd_key->nd_sll, ETH_ALEN); - memcpy(swkey->ipv6.nd.tll, nd_key->nd_tll, ETH_ALEN); - } - break; - } - - return 0; -} - -static int parse_flow_nlattrs(const struct nlattr *attr, - const struct nlattr *a[], u64 *attrsp) +static int __parse_flow_nlattrs(const struct nlattr *attr, + const struct nlattr *a[], + u64 *attrsp, bool nz) { const struct nlattr *nla; u64 attrs; int rem; - attrs = 0; + attrs = *attrsp; nla_for_each_nested(nla, attr, rem) { u16 type = nla_type(nla); int expected_len; @@ -977,8 +1112,14 @@ static int parse_flow_nlattrs(const struct nlattr *attr, if (nla_len(nla) != expected_len && expected_len != -1) return -EINVAL; - attrs |= 1ULL << type; - a[type] = nla; + if (attrs & (1ULL << type)) + /* Duplicated field. */ + return -EINVAL; + + if (!nz || !is_all_zero(nla_data(nla), expected_len)) { + attrs |= 1ULL << type; + a[type] = nla; + } } if (rem) return -EINVAL; @@ -987,14 +1128,25 @@ static int parse_flow_nlattrs(const struct nlattr *attr, 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 ipv4_tun_from_nlattr(const struct nlattr *attr, - struct ovs_key_ipv4_tunnel *tun_key) + struct sw_flow_match *match, bool is_mask) { struct nlattr *a; int rem; bool ttl = false; - - memset(tun_key, 0, sizeof(*tun_key)); + u16 tun_flags = 0; nla_for_each_nested(a, attr, rem) { int type = nla_type(a); @@ -1014,37 +1166,44 @@ int ipv4_tun_from_nlattr(const struct nlattr *attr, switch (type) { case OVS_TUNNEL_KEY_ATTR_ID: - tun_key->tun_id = nla_get_be64(a); - tun_key->tun_flags |= OVS_TNL_F_KEY; + SW_FLOW_KEY_PUT(match, tun_key.tun_id, + nla_get_be64(a), is_mask); + tun_flags |= OVS_TNL_F_KEY; break; case OVS_TUNNEL_KEY_ATTR_IPV4_SRC: - tun_key->ipv4_src = nla_get_be32(a); + SW_FLOW_KEY_PUT(match, tun_key.ipv4_src, + nla_get_be32(a), is_mask); break; case OVS_TUNNEL_KEY_ATTR_IPV4_DST: - tun_key->ipv4_dst = nla_get_be32(a); + SW_FLOW_KEY_PUT(match, tun_key.ipv4_dst, + nla_get_be32(a), is_mask); break; case OVS_TUNNEL_KEY_ATTR_TOS: - tun_key->ipv4_tos = nla_get_u8(a); + SW_FLOW_KEY_PUT(match, tun_key.ipv4_tos, + nla_get_u8(a), is_mask); break; case OVS_TUNNEL_KEY_ATTR_TTL: - tun_key->ipv4_ttl = nla_get_u8(a); + 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_key->tun_flags |= OVS_TNL_F_DONT_FRAGMENT; + tun_flags |= OVS_TNL_F_DONT_FRAGMENT; break; case OVS_TUNNEL_KEY_ATTR_CSUM: - tun_key->tun_flags |= OVS_TNL_F_CSUM; + tun_flags |= OVS_TNL_F_CSUM; break; default: return -EINVAL; - } } + + SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask); + if (rem > 0) return -EINVAL; - if (!tun_key->ipv4_dst) + if (!match->key->tun_key.ipv4_dst) return -EINVAL; if (!ttl) @@ -1054,7 +1213,8 @@ int ipv4_tun_from_nlattr(const struct nlattr *attr, } int ipv4_tun_to_nlattr(struct sk_buff *skb, - const struct ovs_key_ipv4_tunnel *tun_key) + const struct ovs_key_ipv4_tunnel *tun_key, + const struct ovs_key_ipv4_tunnel *output) { struct nlattr *nla; @@ -1063,17 +1223,17 @@ int ipv4_tun_to_nlattr(struct sk_buff *skb, return -EMSGSIZE; if (tun_key->tun_flags & OVS_TNL_F_KEY && - nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, tun_key->tun_id)) + nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id)) return -EMSGSIZE; if (tun_key->ipv4_src && - nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, tun_key->ipv4_src)) + nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, output->ipv4_src)) return -EMSGSIZE; - if (nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, tun_key->ipv4_dst)) + if (nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, output->ipv4_dst)) return -EMSGSIZE; if (tun_key->ipv4_tos && - nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, tun_key->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, tun_key->ipv4_ttl)) + if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ipv4_ttl)) return -EMSGSIZE; if ((tun_key->tun_flags & OVS_TNL_F_DONT_FRAGMENT) && nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT)) @@ -1086,181 +1246,307 @@ int ipv4_tun_to_nlattr(struct sk_buff *skb, return 0; } -/** - * ovs_flow_from_nlattrs - parses Netlink attributes into a flow key. - * @swkey: receives the extracted flow key. - * @key_lenp: number of bytes used in @swkey. - * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute - * sequence. - */ -int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp, - const struct nlattr *attr) + +static int metadata_from_nlattrs(struct sw_flow_match *match, u64 *attrs, + const struct nlattr **a, bool is_mask) +{ + if (*attrs & (1ULL << OVS_KEY_ATTR_PRIORITY)) { + SW_FLOW_KEY_PUT(match, phy.priority, + nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask); + *attrs &= ~(1ULL << OVS_KEY_ATTR_PRIORITY); + } + + if (*attrs & (1ULL << OVS_KEY_ATTR_IN_PORT)) { + u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]); + + if (!is_mask && in_port >= DP_MAX_PORTS) + return -EINVAL; + SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask); + *attrs &= ~(1ULL << OVS_KEY_ATTR_IN_PORT); + } + + if (*attrs & (1ULL << OVS_KEY_ATTR_SKB_MARK)) { + uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]); +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20) && !defined(CONFIG_NETFILTER) + if (!is_mask && mark != 0) + return -EINVAL; +#endif + SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask); + *attrs &= ~(1ULL << OVS_KEY_ATTR_SKB_MARK); + } + if (*attrs & (1ULL << OVS_KEY_ATTR_TUNNEL)) { + if (ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match, + is_mask)) + return -EINVAL; + *attrs &= ~(1ULL << 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) { - const struct nlattr *a[OVS_KEY_ATTR_MAX + 1]; - const struct ovs_key_ethernet *eth_key; - int key_len; - u64 attrs; int err; - memset(swkey, 0, sizeof(struct sw_flow_key)); - key_len = SW_FLOW_KEY_OFFSET(eth); - - err = parse_flow_nlattrs(attr, a, &attrs); + err = metadata_from_nlattrs(match, &attrs, a, is_mask); if (err) return err; - /* Metadata attributes. */ - if (attrs & (1 << OVS_KEY_ATTR_PRIORITY)) { - swkey->phy.priority = nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]); - 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 (in_port >= DP_MAX_PORTS) - return -EINVAL; - swkey->phy.in_port = in_port; - attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT); - } else { - swkey->phy.in_port = DP_MAX_PORTS; - } - if (attrs & (1 << OVS_KEY_ATTR_SKB_MARK)) { - uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]); -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20) && !defined(CONFIG_NETFILTER) - if (mark != 0) - return -EINVAL; -#endif - swkey->phy.skb_mark = mark; - attrs &= ~(1 << OVS_KEY_ATTR_SKB_MARK); + if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_ETHERNET); } - if (attrs & (1ULL << OVS_KEY_ATTR_TUNNEL)) { - err = ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], &swkey->tun_key); + if (attrs & (1ULL << OVS_KEY_ATTR_VLAN)) { + __be16 tci; + + tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]); + if (!is_mask && (tci & htons(VLAN_TAG_PRESENT))) + return -EINVAL; + + SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask); + attrs &= ~(1ULL << OVS_KEY_ATTR_VLAN); + } + + if (attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) { + __be16 eth_type; + + eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]); + if (!is_mask && ntohs(eth_type) < ETH_P_802_3_MIN) + return -EINVAL; + + SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask); + attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE); + } else if (!is_mask) { + SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask); + } + + if (attrs & (1ULL << 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) + 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 &= ~(1ULL << OVS_KEY_ATTR_IPV4); + } + + if (attrs & (1ULL << 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) + 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 &= ~(1ULL << OVS_KEY_ATTR_IPV6); + } + + if (attrs & (1ULL << 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))) + 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 &= ~(1ULL << OVS_KEY_ATTR_ARP); + } + + if (attrs & (1ULL << OVS_KEY_ATTR_TCP)) { + const struct ovs_key_tcp *tcp_key; + + tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]); + 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); + attrs &= ~(1ULL << OVS_KEY_ATTR_TCP); + } + + if (attrs & (1ULL << OVS_KEY_ATTR_UDP)) { + const struct ovs_key_udp *udp_key; + + udp_key = nla_data(a[OVS_KEY_ATTR_UDP]); + 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); + attrs &= ~(1ULL << OVS_KEY_ATTR_UDP); + } + + if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_ICMP); + } + + if (attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_ICMPV6); + } + + if (attrs & (1ULL << 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 &= ~(1ULL << 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 *m[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 & 1ULL << OVS_KEY_ATTR_ENCAP) { + encap = a[OVS_KEY_ATTR_ENCAP]; + key_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP); + if (nla_len(encap)) { + __be16 eth_type = 0; /* ETH_P_8021Q */ + + if (a[OVS_KEY_ATTR_ETHERTYPE]) + eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]); + + if ((eth_type == htons(ETH_P_8021Q)) && (a[OVS_KEY_ATTR_VLAN])) { + encap_valid = true; + key_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE); + err = parse_flow_nlattrs(encap, a, &key_attrs); + } else + err = -EINVAL; + + if (err) + return err; + } + } + + err = ovs_key_from_nlattrs(match, key_attrs, a, false); + if (err) + return err; + + if (mask) { + err = parse_flow_mask_nlattrs(mask, m, &mask_attrs); if (err) return err; - attrs &= ~(1ULL << OVS_KEY_ATTR_TUNNEL); - } + if ((mask_attrs & 1ULL << OVS_KEY_ATTR_ENCAP) && encap_valid) { + __be16 eth_type = 0; - /* Data attributes. */ - if (!(attrs & (1 << OVS_KEY_ATTR_ETHERNET))) - return -EINVAL; - attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET); + if (m[OVS_KEY_ATTR_ETHERTYPE]) + eth_type = nla_get_be16(m[OVS_KEY_ATTR_ETHERTYPE]); + if (eth_type == htons(0xffff)) { + mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE); + encap = m[OVS_KEY_ATTR_ENCAP]; + err = parse_flow_mask_nlattrs(encap, m, &mask_attrs); + } else + err = -EINVAL; - eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]); - memcpy(swkey->eth.src, eth_key->eth_src, ETH_ALEN); - memcpy(swkey->eth.dst, eth_key->eth_dst, ETH_ALEN); - - if (attrs & (1u << OVS_KEY_ATTR_ETHERTYPE) && - nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q)) { - const struct nlattr *encap; - __be16 tci; - - if (attrs != ((1 << OVS_KEY_ATTR_VLAN) | - (1 << OVS_KEY_ATTR_ETHERTYPE) | - (1 << OVS_KEY_ATTR_ENCAP))) - return -EINVAL; - - encap = a[OVS_KEY_ATTR_ENCAP]; - tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]); - if (tci & htons(VLAN_TAG_PRESENT)) { - swkey->eth.tci = tci; - - err = parse_flow_nlattrs(encap, a, &attrs); if (err) return err; - } else if (!tci) { - /* Corner case for truncated 802.1Q header. */ - if (nla_len(encap)) - return -EINVAL; - - swkey->eth.type = htons(ETH_P_8021Q); - *key_lenp = key_len; - return 0; - } else { - return -EINVAL; } - } - if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) { - swkey->eth.type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]); - if (ntohs(swkey->eth.type) < ETH_P_802_3_MIN) - return -EINVAL; - attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE); + err = ovs_key_from_nlattrs(match, mask_attrs, m, true); + if (err) + return err; } else { - swkey->eth.type = htons(ETH_P_802_2); + /* Populate exact match flow's key mask. */ + if (match->mask) + ovs_sw_flow_mask_set(match->mask, &match->range, 0xff); } - if (swkey->eth.type == htons(ETH_P_IP)) { - const struct ovs_key_ipv4 *ipv4_key; - - if (!(attrs & (1 << OVS_KEY_ATTR_IPV4))) - return -EINVAL; - attrs &= ~(1 << OVS_KEY_ATTR_IPV4); - - key_len = SW_FLOW_KEY_OFFSET(ipv4.addr); - ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]); - if (ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX) - return -EINVAL; - swkey->ip.proto = ipv4_key->ipv4_proto; - swkey->ip.tos = ipv4_key->ipv4_tos; - swkey->ip.ttl = ipv4_key->ipv4_ttl; - swkey->ip.frag = ipv4_key->ipv4_frag; - swkey->ipv4.addr.src = ipv4_key->ipv4_src; - swkey->ipv4.addr.dst = ipv4_key->ipv4_dst; - - if (swkey->ip.frag != OVS_FRAG_TYPE_LATER) { - err = ipv4_flow_from_nlattrs(swkey, &key_len, a, &attrs); - if (err) - return err; - } - } else if (swkey->eth.type == htons(ETH_P_IPV6)) { - const struct ovs_key_ipv6 *ipv6_key; - - if (!(attrs & (1 << OVS_KEY_ATTR_IPV6))) - return -EINVAL; - attrs &= ~(1 << OVS_KEY_ATTR_IPV6); - - key_len = SW_FLOW_KEY_OFFSET(ipv6.label); - ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]); - if (ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX) - return -EINVAL; - swkey->ipv6.label = ipv6_key->ipv6_label; - swkey->ip.proto = ipv6_key->ipv6_proto; - swkey->ip.tos = ipv6_key->ipv6_tclass; - swkey->ip.ttl = ipv6_key->ipv6_hlimit; - swkey->ip.frag = ipv6_key->ipv6_frag; - memcpy(&swkey->ipv6.addr.src, ipv6_key->ipv6_src, - sizeof(swkey->ipv6.addr.src)); - memcpy(&swkey->ipv6.addr.dst, ipv6_key->ipv6_dst, - sizeof(swkey->ipv6.addr.dst)); - - if (swkey->ip.frag != OVS_FRAG_TYPE_LATER) { - err = ipv6_flow_from_nlattrs(swkey, &key_len, a, &attrs); - if (err) - return err; - } - } else if (swkey->eth.type == htons(ETH_P_ARP) || - swkey->eth.type == htons(ETH_P_RARP)) { - const struct ovs_key_arp *arp_key; - - if (!(attrs & (1 << OVS_KEY_ATTR_ARP))) - return -EINVAL; - attrs &= ~(1 << OVS_KEY_ATTR_ARP); - - key_len = SW_FLOW_KEY_OFFSET(ipv4.arp); - arp_key = nla_data(a[OVS_KEY_ATTR_ARP]); - swkey->ipv4.addr.src = arp_key->arp_sip; - swkey->ipv4.addr.dst = arp_key->arp_tip; - if (arp_key->arp_op & htons(0xff00)) - return -EINVAL; - swkey->ip.proto = ntohs(arp_key->arp_op); - memcpy(swkey->ipv4.arp.sha, arp_key->arp_sha, ETH_ALEN); - memcpy(swkey->ipv4.arp.tha, arp_key->arp_tha, ETH_ALEN); - } - - if (attrs) + if (!ovs_match_validate(match, key_attrs, mask_attrs)) return -EINVAL; - *key_lenp = key_len; return 0; } @@ -1268,7 +1554,6 @@ int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp, /** * ovs_flow_metadata_from_nlattrs - parses Netlink attributes into a flow key. * @flow: Receives extracted in_port, priority, tun_key and skb_mark. - * @key_len: Length of key in @flow. Used for calculating flow hash. * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute * sequence. * @@ -1278,106 +1563,87 @@ int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp, * extracted from the packet itself. */ -int ovs_flow_metadata_from_nlattrs(struct sw_flow *flow, int key_len, const struct nlattr *attr) +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 *nla; - int rem; + 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)); - nla_for_each_nested(nla, attr, rem) { - int type = nla_type(nla); - - if (type <= OVS_KEY_ATTR_MAX && ovs_key_lens[type] > 0) { - int err; - - if (nla_len(nla) != ovs_key_lens[type]) - return -EINVAL; - - switch (type) { - case OVS_KEY_ATTR_PRIORITY: - flow->key.phy.priority = nla_get_u32(nla); - break; - - case OVS_KEY_ATTR_TUNNEL: - err = ipv4_tun_from_nlattr(nla, tun_key); - if (err) - return err; - break; - - case OVS_KEY_ATTR_IN_PORT: - if (nla_get_u32(nla) >= DP_MAX_PORTS) - return -EINVAL; - flow->key.phy.in_port = nla_get_u32(nla); - break; - - case OVS_KEY_ATTR_SKB_MARK: -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20) && !defined(CONFIG_NETFILTER) - if (nla_get_u32(nla) != 0) - return -EINVAL; -#endif - flow->key.phy.skb_mark = nla_get_u32(nla); - break; - } - } - } - if (rem) + err = parse_flow_nlattrs(attr, a, &attrs); + if (err) return -EINVAL; - flow->hash = ovs_flow_hash(&flow->key, - flow_key_start(&flow->key), key_len); + ovs_match_init(&match, &flow->key, NULL); + + 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, struct sk_buff *skb) +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; if (swkey->phy.priority && - nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, swkey->phy.priority)) + nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority)) goto nla_put_failure; if (swkey->tun_key.ipv4_dst && - ipv4_tun_to_nlattr(skb, &swkey->tun_key)) + ipv4_tun_to_nlattr(skb, &swkey->tun_key, &output->tun_key)) goto nla_put_failure; - if (swkey->phy.in_port != DP_MAX_PORTS && - nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, swkey->phy.in_port)) - goto nla_put_failure; + if (swkey->phy.in_port != DP_MAX_PORTS) { + /* Exact match upper 16 bits. */ + u16 upper_u16; + upper_u16 = (swkey == output) ? 0 : 0xffff; + + if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, + (upper_u16 << 16) | output->phy.in_port)) + goto nla_put_failure; + } if (swkey->phy.skb_mark && - nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, swkey->phy.skb_mark)) + 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, swkey->eth.src, ETH_ALEN); - memcpy(eth_key->eth_dst, swkey->eth.dst, ETH_ALEN); + 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)) { - if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, htons(ETH_P_8021Q)) || - nla_put_be16(skb, OVS_KEY_ATTR_VLAN, swkey->eth.tci)) + __be16 eth_type; + eth_type = (swkey == output) ? 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 { + } else encap = NULL; - } - if (swkey->eth.type == htons(ETH_P_802_2)) + if ((swkey == output) && (swkey->eth.type == htons(ETH_P_802_2))) goto unencap; - if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, swkey->eth.type)) - goto nla_put_failure; + if (output->eth.type != 0) + 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; @@ -1386,12 +1652,12 @@ int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey, struct sk_buff *skb) if (!nla) goto nla_put_failure; ipv4_key = nla_data(nla); - ipv4_key->ipv4_src = swkey->ipv4.addr.src; - ipv4_key->ipv4_dst = swkey->ipv4.addr.dst; - ipv4_key->ipv4_proto = swkey->ip.proto; - ipv4_key->ipv4_tos = swkey->ip.tos; - ipv4_key->ipv4_ttl = swkey->ip.ttl; - ipv4_key->ipv4_frag = swkey->ip.frag; + 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; @@ -1399,15 +1665,15 @@ int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey, struct sk_buff *skb) if (!nla) goto nla_put_failure; ipv6_key = nla_data(nla); - memcpy(ipv6_key->ipv6_src, &swkey->ipv6.addr.src, + memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src, sizeof(ipv6_key->ipv6_src)); - memcpy(ipv6_key->ipv6_dst, &swkey->ipv6.addr.dst, + memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst, sizeof(ipv6_key->ipv6_dst)); - ipv6_key->ipv6_label = swkey->ipv6.label; - ipv6_key->ipv6_proto = swkey->ip.proto; - ipv6_key->ipv6_tclass = swkey->ip.tos; - ipv6_key->ipv6_hlimit = swkey->ip.ttl; - ipv6_key->ipv6_frag = swkey->ip.frag; + 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; @@ -1417,11 +1683,11 @@ int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey, struct sk_buff *skb) goto nla_put_failure; arp_key = nla_data(nla); memset(arp_key, 0, sizeof(struct ovs_key_arp)); - arp_key->arp_sip = swkey->ipv4.addr.src; - arp_key->arp_tip = swkey->ipv4.addr.dst; - arp_key->arp_op = htons(swkey->ip.proto); - memcpy(arp_key->arp_sha, swkey->ipv4.arp.sha, ETH_ALEN); - memcpy(arp_key->arp_tha, swkey->ipv4.arp.tha, ETH_ALEN); + 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) || @@ -1436,11 +1702,11 @@ int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey, struct sk_buff *skb) goto nla_put_failure; tcp_key = nla_data(nla); if (swkey->eth.type == htons(ETH_P_IP)) { - tcp_key->tcp_src = swkey->ipv4.tp.src; - tcp_key->tcp_dst = swkey->ipv4.tp.dst; + 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 = swkey->ipv6.tp.src; - tcp_key->tcp_dst = swkey->ipv6.tp.dst; + 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; @@ -1450,11 +1716,11 @@ int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey, struct sk_buff *skb) goto nla_put_failure; udp_key = nla_data(nla); if (swkey->eth.type == htons(ETH_P_IP)) { - udp_key->udp_src = swkey->ipv4.tp.src; - udp_key->udp_dst = swkey->ipv4.tp.dst; + 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 = swkey->ipv6.tp.src; - udp_key->udp_dst = swkey->ipv6.tp.dst; + udp_key->udp_src = output->ipv6.tp.src; + udp_key->udp_dst = output->ipv6.tp.dst; } } else if (swkey->eth.type == htons(ETH_P_IP) && swkey->ip.proto == IPPROTO_ICMP) { @@ -1464,8 +1730,8 @@ int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey, struct sk_buff *skb) if (!nla) goto nla_put_failure; icmp_key = nla_data(nla); - icmp_key->icmp_type = ntohs(swkey->ipv4.tp.src); - icmp_key->icmp_code = ntohs(swkey->ipv4.tp.dst); + 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; @@ -1475,8 +1741,8 @@ int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey, struct sk_buff *skb) if (!nla) goto nla_put_failure; icmpv6_key = nla_data(nla); - icmpv6_key->icmpv6_type = ntohs(swkey->ipv6.tp.src); - icmpv6_key->icmpv6_code = ntohs(swkey->ipv6.tp.dst); + 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) { @@ -1486,10 +1752,10 @@ int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey, struct sk_buff *skb) if (!nla) goto nla_put_failure; nd_key = nla_data(nla); - memcpy(nd_key->nd_target, &swkey->ipv6.nd.target, + memcpy(nd_key->nd_target, &output->ipv6.nd.target, sizeof(nd_key->nd_target)); - memcpy(nd_key->nd_sll, swkey->ipv6.nd.sll, ETH_ALEN); - memcpy(nd_key->nd_tll, swkey->ipv6.nd.tll, ETH_ALEN); + memcpy(nd_key->nd_sll, output->ipv6.nd.sll, ETH_ALEN); + memcpy(nd_key->nd_tll, output->ipv6.nd.tll, ETH_ALEN); } } } @@ -1521,3 +1787,91 @@ 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++; +} + +static void rcu_free_sw_flow_mask_cb(struct rcu_head *rcu) +{ + struct sw_flow_mask *mask = container_of(rcu, struct sw_flow_mask, rcu); + + kfree(mask); +} + +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) + call_rcu(&mask->rcu, rcu_free_sw_flow_mask_cb); + 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_, ovs_sw_flow_mask_actual_size(a)) == 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, ovs_sw_flow_mask_size_roundup(mask)); +} diff --git a/datapath/flow.h b/datapath/flow.h index dba66cf1e..2b6f217dc 100644 --- a/datapath/flow.h +++ b/datapath/flow.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2007-2011 Nicira, Inc. + * Copyright (c) 2007-2013 Nicira, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public @@ -33,6 +33,8 @@ #include struct sk_buff; +struct sw_flow_mask; +struct flow_table; struct sw_flow_actions { struct rcu_head rcu; @@ -120,6 +122,8 @@ struct sw_flow { u32 hash; struct sw_flow_key key; + struct sw_flow_key unmasked_key; + struct sw_flow_mask __rcu *mask; struct sw_flow_actions __rcu *sf_acts; spinlock_t lock; /* Lock for values below. */ @@ -129,6 +133,25 @@ struct sw_flow { u8 tcp_flags; /* Union of seen TCP flags. */ }; +struct sw_flow_key_range { + size_t start; + size_t end; +}; + +static inline u16 ovs_sw_flow_key_range_actual_size(const struct sw_flow_key_range *range) +{ + return range->end - range->start; +} + +struct sw_flow_match { + struct sw_flow_key *key; + struct sw_flow_key_range range; + struct sw_flow_mask *mask; +}; + +void ovs_match_init(struct sw_flow_match *match, + struct sw_flow_key *key, struct sw_flow_mask *mask); + struct arp_eth_header { __be16 ar_hrd; /* format of hardware address */ __be16 ar_pro; /* format of protocol address */ @@ -148,21 +171,21 @@ void ovs_flow_exit(void); struct sw_flow *ovs_flow_alloc(void); void ovs_flow_deferred_free(struct sw_flow *); -void ovs_flow_free(struct sw_flow *); +void ovs_flow_free(struct sw_flow *, bool deferred); struct sw_flow_actions *ovs_flow_actions_alloc(int actions_len); void ovs_flow_deferred_free_acts(struct sw_flow_actions *); -int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *, - int *key_lenp); +int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *); void ovs_flow_used(struct sw_flow *, struct sk_buff *); u64 ovs_flow_used_time(unsigned long flow_jiffies); - -int ovs_flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *); -int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp, +int ovs_flow_to_nlattrs(const struct sw_flow_key *, + const struct sw_flow_key *, struct sk_buff *); +int ovs_match_from_nlattrs(struct sw_flow_match *match, + const struct nlattr *, const struct nlattr *); -int ovs_flow_metadata_from_nlattrs(struct sw_flow *flow, int key_len, - const struct nlattr *attr); +int ovs_flow_metadata_from_nlattrs(struct sw_flow *flow, + const struct nlattr *attr); #define MAX_ACTIONS_BUFSIZE (32 * 1024) #define TBL_MIN_BUCKETS 1024 @@ -171,6 +194,7 @@ struct flow_table { struct flex_array *buckets; unsigned int count, n_buckets; struct rcu_head rcu; + struct list_head mask_list; int node_ver; u32 hash_seed; bool keep_flows; @@ -186,22 +210,55 @@ static inline int ovs_flow_tbl_need_to_expand(struct flow_table *table) return (table->count > table->n_buckets); } -struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table, - struct sw_flow_key *key, int len); -void ovs_flow_tbl_destroy(struct flow_table *table); -void ovs_flow_tbl_deferred_destroy(struct flow_table *table); +struct sw_flow *ovs_flow_lookup(struct flow_table *, + const struct sw_flow_key *); +struct sw_flow *ovs_flow_lookup_unmasked_key(struct flow_table *table, + struct sw_flow_match *match); + +void ovs_flow_tbl_destroy(struct flow_table *table, bool deferred); struct flow_table *ovs_flow_tbl_alloc(int new_size); struct flow_table *ovs_flow_tbl_expand(struct flow_table *table); struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table); -void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow, - struct sw_flow_key *key, int key_len); -void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow); +void ovs_flow_insert(struct flow_table *table, struct sw_flow *flow, + const struct sw_flow_key *key, int key_len); -struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *idx); +void ovs_flow_remove(struct flow_table *table, struct sw_flow *flow); + +struct sw_flow *ovs_flow_dump_next(struct flow_table *table, u32 *bucket, u32 *idx); extern const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1]; int ipv4_tun_from_nlattr(const struct nlattr *attr, - struct ovs_key_ipv4_tunnel *tun_key); + struct sw_flow_match *match, bool is_mask); int ipv4_tun_to_nlattr(struct sk_buff *skb, - const struct ovs_key_ipv4_tunnel *tun_key); + const struct ovs_key_ipv4_tunnel *tun_key, + const struct ovs_key_ipv4_tunnel *output); +bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow, + const struct sw_flow_key *key, int key_len); + +struct sw_flow_mask { + int ref_count; + struct rcu_head rcu; + struct list_head list; + struct sw_flow_key_range range; + struct sw_flow_key key; +}; + +static inline u16 +ovs_sw_flow_mask_actual_size(const struct sw_flow_mask *mask) +{ + return ovs_sw_flow_key_range_actual_size(&mask->range); +} + +static inline u16 +ovs_sw_flow_mask_size_roundup(const struct sw_flow_mask *mask) +{ + return roundup(ovs_sw_flow_mask_actual_size(mask), sizeof(u32)); +} + +struct sw_flow_mask *ovs_sw_flow_mask_alloc(void); +void ovs_sw_flow_mask_add_ref(struct sw_flow_mask *); +void ovs_sw_flow_mask_del_ref(struct sw_flow_mask *, bool deferred); +void ovs_sw_flow_mask_insert(struct flow_table *, struct sw_flow_mask *); +struct sw_flow_mask *ovs_sw_flow_mask_find(const struct flow_table *, + const struct sw_flow_mask *); #endif /* flow.h */ diff --git a/include/linux/openvswitch.h b/include/linux/openvswitch.h index e890fd82d..a119b149b 100644 --- a/include/linux/openvswitch.h +++ b/include/linux/openvswitch.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2007-2011 Nicira, Inc. + * Copyright (c) 2007-2013 Nicira, Inc. * * This file is offered under your choice of two licenses: Apache 2.0 or GNU * GPL 2.0 or later. The permission statements for each of these licenses is @@ -410,6 +410,12 @@ struct ovs_key_nd { * @OVS_FLOW_ATTR_CLEAR: If present in a %OVS_FLOW_CMD_SET request, clears the * last-used time, accumulated TCP flags, and statistics for this flow. * Otherwise ignored in requests. Never present in notifications. + * @OVS_FLOW_ATTR_MASK: Nested %OVS_KEY_ATTR_* attributes specifying the + * mask bits for wildcarded flow match. Mask bit value '1' specifies exact + * match with corresponding flow key bit, while mask bit value '0' specifies + * a wildcarded match. Omitting attribute is treated as wildcarding all + * corresponding fields. Optional for all requests. If not present, + * all flow key bits are exact match bits. * * These attributes follow the &struct ovs_header within the Generic Netlink * payload for %OVS_FLOW_* commands. @@ -422,6 +428,7 @@ enum ovs_flow_attr { OVS_FLOW_ATTR_TCP_FLAGS, /* 8-bit OR'd TCP flags. */ OVS_FLOW_ATTR_USED, /* u64 msecs last used in monotonic time. */ OVS_FLOW_ATTR_CLEAR, /* Flag to clear stats, tcp_flags, used. */ + OVS_FLOW_ATTR_MASK, /* Sequence of OVS_KEY_ATTR_* attributes. */ __OVS_FLOW_ATTR_MAX };