-
-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;
- u64 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 & (1ULL << 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 |= 1ULL << 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 & (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 = 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 &= ~(1ULL << OVS_KEY_ATTR_IN_PORT);
- } else if (!is_mask) {
- SW_FLOW_KEY_PUT(match, phy.in_port, DP_MAX_PORTS, is_mask);
- }
-
- if (*attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_SKB_MARK);
- }
- if (*attrs & (1ULL << OVS_KEY_ATTR_TUNNEL)) {
- if (ovs_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)
-{
- int err;
- u64 orig_attrs = attrs;
-
- err = metadata_from_nlattrs(match, &attrs, a, is_mask);
- if (err)
- return err;
-
- 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_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 &= ~(1ULL << OVS_KEY_ATTR_VLAN);
- } else if (!is_mask)
- SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
-
- if (attrs & (1ULL << 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 &= ~(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) {
- 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 &= ~(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) {
- 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 &= ~(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))) {
- 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 &= ~(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]);
- if (orig_attrs & (1ULL << 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 &= ~(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]);
- if (orig_attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_UDP);
- }
-
- if (attrs & (1ULL << OVS_KEY_ATTR_SCTP)) {
- const struct ovs_key_sctp *sctp_key;
-
- sctp_key = nla_data(a[OVS_KEY_ATTR_SCTP]);
- if (orig_attrs & (1ULL << 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 &= ~(1ULL << OVS_KEY_ATTR_SCTP);
- }
-
- 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 *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_ETHERNET)) &&
- (key_attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) &&
- (nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) {
- __be16 tci;
-
- if (!((key_attrs & (1ULL << OVS_KEY_ATTR_VLAN)) &&
- (key_attrs & (1ULL << OVS_KEY_ATTR_ENCAP)))) {
- OVS_NLERR("Invalid Vlan frame.\n");
- return -EINVAL;
- }
-
- key_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
- tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
- encap = a[OVS_KEY_ATTR_ENCAP];
- key_attrs &= ~(1ULL << 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 &= ~(1ULL << 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 &= ~(1ULL << 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++;
-}
-
-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_, 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));
-}