X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fflow.c;h=0b6541f6f9b7dd3c52d3638e6498cd4106519516;hb=1e37a2d75196c6e10ac078213ad94afb4f3e219a;hp=7d4a1bd4d98a36a3c106f92fad459f8b7889672f;hpb=9052790aac60c01195c170d0ed2c7159e1343af7;p=openvswitch diff --git a/lib/flow.c b/lib/flow.c index 7d4a1bd4..0b6541f6 100644 --- a/lib/flow.c +++ b/lib/flow.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2008, 2009 Nicira Networks. + * Copyright (c) 2008, 2009, 2010 Nicira Networks. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -20,6 +20,7 @@ #include #include #include +#include "byte-order.h" #include "coverage.h" #include "dynamic-string.h" #include "hash.h" @@ -27,9 +28,10 @@ #include "openflow/openflow.h" #include "openvswitch/datapath-protocol.h" #include "packets.h" - +#include "unaligned.h" #include "vlog.h" -#define THIS_MODULE VLM_flow + +VLOG_DEFINE_THIS_MODULE(flow); static struct arp_eth_header * pull_arp(struct ofpbuf *packet) @@ -51,7 +53,7 @@ pull_ip(struct ofpbuf *packet) } static struct tcp_header * -pull_tcp(struct ofpbuf *packet) +pull_tcp(struct ofpbuf *packet) { if (packet->size >= TCP_HEADER_LEN) { struct tcp_header *tcp = packet->data; @@ -64,32 +66,78 @@ pull_tcp(struct ofpbuf *packet) } static struct udp_header * -pull_udp(struct ofpbuf *packet) +pull_udp(struct ofpbuf *packet) { return ofpbuf_try_pull(packet, UDP_HEADER_LEN); } static struct icmp_header * -pull_icmp(struct ofpbuf *packet) +pull_icmp(struct ofpbuf *packet) { return ofpbuf_try_pull(packet, ICMP_HEADER_LEN); } -static struct eth_header * -pull_eth(struct ofpbuf *packet) +static void +parse_vlan(struct ofpbuf *b, struct flow *flow) { - return ofpbuf_try_pull(packet, ETH_HEADER_LEN); + struct qtag_prefix { + ovs_be16 eth_type; /* ETH_TYPE_VLAN */ + ovs_be16 tci; + }; + + if (b->size >= sizeof(struct qtag_prefix) + sizeof(ovs_be16)) { + struct qtag_prefix *qp = ofpbuf_pull(b, sizeof *qp); + flow->dl_vlan = qp->tci & htons(VLAN_VID_MASK); + flow->dl_vlan_pcp = vlan_tci_to_pcp(qp->tci); + } } -static struct vlan_header * -pull_vlan(struct ofpbuf *packet) +static ovs_be16 +parse_ethertype(struct ofpbuf *b) { - return ofpbuf_try_pull(packet, VLAN_HEADER_LEN); + struct llc_snap_header *llc; + ovs_be16 proto; + + proto = *(ovs_be16 *) ofpbuf_pull(b, sizeof proto); + if (ntohs(proto) >= ODP_DL_TYPE_ETH2_CUTOFF) { + return proto; + } + + if (b->size < sizeof *llc) { + return htons(ODP_DL_TYPE_NOT_ETH_TYPE); + } + + llc = b->data; + if (llc->llc.llc_dsap != LLC_DSAP_SNAP + || llc->llc.llc_ssap != LLC_SSAP_SNAP + || llc->llc.llc_cntl != LLC_CNTL_SNAP + || memcmp(llc->snap.snap_org, SNAP_ORG_ETHERNET, + sizeof llc->snap.snap_org)) { + return htons(ODP_DL_TYPE_NOT_ETH_TYPE); + } + + ofpbuf_pull(b, sizeof *llc); + return llc->snap.snap_type; } -/* Returns 1 if 'packet' is an IP fragment, 0 otherwise. */ +/* Initializes 'flow' members from 'packet', 'tun_id', and 'in_port. + * Initializes 'packet' header pointers as follows: + * + * - packet->l2 to the start of the Ethernet header. + * + * - packet->l3 to just past the Ethernet header, or just past the + * vlan_header if one is present, to the first byte of the payload of the + * Ethernet frame. + * + * - packet->l4 to just past the IPv4 header, if one is present and has a + * correct length, and otherwise NULL. + * + * - packet->l7 to just past the TCP or UDP or ICMP header, if one is + * present and has a correct length, and otherwise NULL. + */ int -flow_extract(struct ofpbuf *packet, uint16_t in_port, flow_t *flow) +flow_extract(struct ofpbuf *packet, ovs_be32 tun_id, uint16_t in_port, + struct flow *flow) { struct ofpbuf b = *packet; struct eth_header *eth; @@ -98,115 +146,83 @@ flow_extract(struct ofpbuf *packet, uint16_t in_port, flow_t *flow) COVERAGE_INC(flow_extract); memset(flow, 0, sizeof *flow); - flow->dl_vlan = htons(OFP_VLAN_NONE); + flow->tun_id = tun_id; flow->in_port = in_port; + flow->dl_vlan = htons(OFP_VLAN_NONE); packet->l2 = b.data; packet->l3 = NULL; packet->l4 = NULL; packet->l7 = NULL; - eth = pull_eth(&b); - if (eth) { - if (ntohs(eth->eth_type) >= OFP_DL_TYPE_ETH2_CUTOFF) { - /* This is an Ethernet II frame */ - flow->dl_type = eth->eth_type; - } else { - /* This is an 802.2 frame */ - struct llc_header *llc = ofpbuf_at(&b, 0, sizeof *llc); - struct snap_header *snap = ofpbuf_at(&b, sizeof *llc, - sizeof *snap); - if (llc == NULL) { - return 0; - } - if (snap - && llc->llc_dsap == LLC_DSAP_SNAP - && llc->llc_ssap == LLC_SSAP_SNAP - && llc->llc_cntl == LLC_CNTL_SNAP - && !memcmp(snap->snap_org, SNAP_ORG_ETHERNET, - sizeof snap->snap_org)) { - flow->dl_type = snap->snap_type; - ofpbuf_pull(&b, LLC_SNAP_HEADER_LEN); - } else { - flow->dl_type = htons(OFP_DL_TYPE_NOT_ETH_TYPE); - ofpbuf_pull(&b, sizeof(struct llc_header)); - } - } + if (b.size < sizeof *eth) { + return 0; + } - /* Check for a VLAN tag */ - if (flow->dl_type == htons(ETH_TYPE_VLAN)) { - struct vlan_header *vh = pull_vlan(&b); - if (vh) { - flow->dl_type = vh->vlan_next_type; - flow->dl_vlan = vh->vlan_tci & htons(VLAN_VID_MASK); - } - } - memcpy(flow->dl_src, eth->eth_src, ETH_ADDR_LEN); - memcpy(flow->dl_dst, eth->eth_dst, ETH_ADDR_LEN); - - packet->l3 = b.data; - if (flow->dl_type == htons(ETH_TYPE_IP)) { - const struct ip_header *nh = pull_ip(&b); - if (nh) { - flow->nw_src = nh->ip_src; - flow->nw_dst = nh->ip_dst; - flow->nw_proto = nh->ip_proto; - packet->l4 = b.data; - if (!IP_IS_FRAGMENT(nh->ip_frag_off)) { - if (flow->nw_proto == IP_TYPE_TCP) { - const struct tcp_header *tcp = pull_tcp(&b); - if (tcp) { - flow->tp_src = tcp->tcp_src; - flow->tp_dst = tcp->tcp_dst; - packet->l7 = b.data; - } else { - /* Avoid tricking other code into thinking that - * this packet has an L4 header. */ - flow->nw_proto = 0; - } - } else if (flow->nw_proto == IP_TYPE_UDP) { - const struct udp_header *udp = pull_udp(&b); - if (udp) { - flow->tp_src = udp->udp_src; - flow->tp_dst = udp->udp_dst; - packet->l7 = b.data; - } else { - /* Avoid tricking other code into thinking that - * this packet has an L4 header. */ - flow->nw_proto = 0; - } - } else if (flow->nw_proto == IP_TYPE_ICMP) { - const struct icmp_header *icmp = pull_icmp(&b); - if (icmp) { - flow->icmp_type = htons(icmp->icmp_type); - flow->icmp_code = htons(icmp->icmp_code); - packet->l7 = b.data; - } else { - /* Avoid tricking other code into thinking that - * this packet has an L4 header. */ - flow->nw_proto = 0; - } + /* Link layer. */ + eth = b.data; + memcpy(flow->dl_src, eth->eth_src, ETH_ADDR_LEN); + memcpy(flow->dl_dst, eth->eth_dst, ETH_ADDR_LEN); + + /* dl_type, dl_vlan, dl_vlan_pcp. */ + ofpbuf_pull(&b, ETH_ADDR_LEN * 2); + if (eth->eth_type == htons(ETH_TYPE_VLAN)) { + parse_vlan(&b, flow); + } + flow->dl_type = parse_ethertype(&b); + + /* Network layer. */ + packet->l3 = b.data; + if (flow->dl_type == htons(ETH_TYPE_IP)) { + const struct ip_header *nh = pull_ip(&b); + if (nh) { + flow->nw_src = get_unaligned_u32(&nh->ip_src); + flow->nw_dst = get_unaligned_u32(&nh->ip_dst); + flow->nw_tos = nh->ip_tos & IP_DSCP_MASK; + flow->nw_proto = nh->ip_proto; + packet->l4 = b.data; + if (!IP_IS_FRAGMENT(nh->ip_frag_off)) { + if (flow->nw_proto == IP_TYPE_TCP) { + const struct tcp_header *tcp = pull_tcp(&b); + if (tcp) { + flow->tp_src = tcp->tcp_src; + flow->tp_dst = tcp->tcp_dst; + packet->l7 = b.data; + } + } else if (flow->nw_proto == IP_TYPE_UDP) { + const struct udp_header *udp = pull_udp(&b); + if (udp) { + flow->tp_src = udp->udp_src; + flow->tp_dst = udp->udp_dst; + packet->l7 = b.data; + } + } else if (flow->nw_proto == IP_TYPE_ICMP) { + const struct icmp_header *icmp = pull_icmp(&b); + if (icmp) { + flow->icmp_type = htons(icmp->icmp_type); + flow->icmp_code = htons(icmp->icmp_code); + packet->l7 = b.data; } - } else { - retval = 1; } + } else { + retval = 1; + } + } + } else if (flow->dl_type == htons(ETH_TYPE_ARP)) { + const struct arp_eth_header *arp = pull_arp(&b); + if (arp && arp->ar_hrd == htons(1) + && arp->ar_pro == htons(ETH_TYPE_IP) + && arp->ar_hln == ETH_ADDR_LEN + && arp->ar_pln == 4) { + /* We only match on the lower 8 bits of the opcode. */ + if (ntohs(arp->ar_op) <= 0xff) { + flow->nw_proto = ntohs(arp->ar_op); } - } else if (flow->dl_type == htons(ETH_TYPE_ARP)) { - const struct arp_eth_header *arp = pull_arp(&b); - if (arp && arp->ar_hrd == htons(1) - && arp->ar_pro == htons(ETH_TYPE_IP) - && arp->ar_hln == ETH_ADDR_LEN - && arp->ar_pln == 4) { - /* We only match on the lower 8 bits of the opcode. */ - if (ntohs(arp->ar_op) <= 0xff) { - flow->nw_proto = ntohs(arp->ar_op); - } - if ((flow->nw_proto == ARP_OP_REQUEST) - || (flow->nw_proto == ARP_OP_REPLY)) { - flow->nw_src = arp->ar_spa; - flow->nw_dst = arp->ar_tpa; - } + if ((flow->nw_proto == ARP_OP_REQUEST) + || (flow->nw_proto == ARP_OP_REPLY)) { + flow->nw_src = arp->ar_spa; + flow->nw_dst = arp->ar_tpa; } } } @@ -217,14 +233,12 @@ flow_extract(struct ofpbuf *packet, uint16_t in_port, flow_t *flow) * arguments must have been initialized through a call to flow_extract(). */ void -flow_extract_stats(const flow_t *flow, struct ofpbuf *packet, +flow_extract_stats(const struct flow *flow, struct ofpbuf *packet, struct odp_flow_stats *stats) { memset(stats, '\0', sizeof(*stats)); if ((flow->dl_type == htons(ETH_TYPE_IP)) && packet->l4) { - struct ip_header *ip = packet->l3; - stats->ip_tos = ip->ip_tos; if ((flow->nw_proto == IP_TYPE_TCP) && packet->l7) { struct tcp_header *tcp = packet->l4; stats->tcp_flags = TCP_FLAGS(tcp->tcp_ctl); @@ -235,79 +249,73 @@ flow_extract_stats(const flow_t *flow, struct ofpbuf *packet, stats->n_packets = 1; } -/* The Open vSwitch datapath supports matching on ARP payloads, which - * OpenFlow does not. This function is identical to 'flow_to_match', - * but does not hide the datapath's ability to match on ARP. */ +/* Extract 'flow' with 'wildcards' into the OpenFlow match structure + * 'match'. 'flow_format' should be one of NXFF_*. */ void -flow_to_ovs_match(const flow_t *flow, uint32_t wildcards, - struct ofp_match *match) +flow_to_match(const struct flow *flow, uint32_t wildcards, + int flow_format, struct ofp_match *match) { + wildcards &= (flow_format == NXFF_TUN_ID_FROM_COOKIE ? OVSFW_ALL + : OFPFW_ALL); match->wildcards = htonl(wildcards); + match->in_port = htons(flow->in_port == ODPP_LOCAL ? OFPP_LOCAL : flow->in_port); match->dl_vlan = flow->dl_vlan; + match->dl_vlan_pcp = flow->dl_vlan_pcp; memcpy(match->dl_src, flow->dl_src, ETH_ADDR_LEN); memcpy(match->dl_dst, flow->dl_dst, ETH_ADDR_LEN); match->dl_type = flow->dl_type; match->nw_src = flow->nw_src; match->nw_dst = flow->nw_dst; + match->nw_tos = flow->nw_tos; match->nw_proto = flow->nw_proto; match->tp_src = flow->tp_src; match->tp_dst = flow->tp_dst; - match->pad = 0; + memset(match->pad1, '\0', sizeof match->pad1); + memset(match->pad2, '\0', sizeof match->pad2); } -/* Extract 'flow' with 'wildcards' into the OpenFlow match structure - * 'match'. */ void -flow_to_match(const flow_t *flow, uint32_t wildcards, struct ofp_match *match) +flow_from_match(const struct ofp_match *match, int flow_format, + ovs_be64 cookie, struct flow *flow, + struct flow_wildcards *wc) { - flow_to_ovs_match(flow, wildcards, match); - - /* The datapath supports matching on an ARP's opcode and IP addresses, - * but OpenFlow does not. We wildcard and zero out the appropriate - * fields so that OpenFlow is unaware of our trickery. */ - if (flow->dl_type == htons(ETH_TYPE_ARP)) { - wildcards |= (OFPFW_NW_PROTO | OFPFW_NW_SRC_ALL | OFPFW_NW_DST_ALL); - match->nw_src = 0; - match->nw_dst = 0; - match->nw_proto = 0; - } - match->wildcards = htonl(wildcards); -} - + uint32_t wildcards = ntohl(match->wildcards) & OVSFW_ALL; -void -flow_from_match(flow_t *flow, uint32_t *wildcards, - const struct ofp_match *match) -{ - if (wildcards) { - *wildcards = ntohl(match->wildcards); + flow->tun_id = 0; + if (flow_format != NXFF_TUN_ID_FROM_COOKIE) { + wildcards |= NXFW_TUN_ID; + } else { + if (!(wildcards & NXFW_TUN_ID)) { + flow->tun_id = htonl(ntohll(cookie) >> 32); + } } - /* The datapath supports matching on an ARP's opcode and IP addresses, - * but OpenFlow does not. In case the controller hasn't, we need to - * set the appropriate wildcard bits so that we're externally - * OpenFlow-compliant. */ - if (match->dl_type == htons(ETH_TYPE_ARP)) { - *wildcards |= (OFPFW_NW_PROTO | OFPFW_NW_SRC_ALL | OFPFW_NW_DST_ALL); + if (wildcards & OFPFW_DL_DST) { + /* OpenFlow 1.0 OFPFW_DL_DST covers the whole Ethernet destination, but + * internally to OVS it excludes the multicast bit, which has to be set + * separately with FWW_ETH_MCAST. */ + wildcards |= FWW_ETH_MCAST; } + flow_wildcards_init(wc, wildcards); flow->nw_src = match->nw_src; flow->nw_dst = match->nw_dst; flow->in_port = (match->in_port == htons(OFPP_LOCAL) ? ODPP_LOCAL : ntohs(match->in_port)); flow->dl_vlan = match->dl_vlan; + flow->dl_vlan_pcp = match->dl_vlan_pcp; flow->dl_type = match->dl_type; flow->tp_src = match->tp_src; flow->tp_dst = match->tp_dst; memcpy(flow->dl_src, match->dl_src, ETH_ADDR_LEN); memcpy(flow->dl_dst, match->dl_dst, ETH_ADDR_LEN); + flow->nw_tos = match->nw_tos; flow->nw_proto = match->nw_proto; - flow->reserved = 0; } char * -flow_to_string(const flow_t *flow) +flow_to_string(const struct flow *flow) { struct ds ds = DS_EMPTY_INITIALIZER; flow_format(&ds, flow); @@ -315,21 +323,255 @@ flow_to_string(const flow_t *flow) } void -flow_format(struct ds *ds, const flow_t *flow) +flow_format(struct ds *ds, const struct flow *flow) { - ds_put_format(ds, "in_port%04x:vlan%d mac"ETH_ADDR_FMT"->"ETH_ADDR_FMT" " - "type%04x proto%"PRId8" ip"IP_FMT"->"IP_FMT" port%d->%d", - flow->in_port, ntohs(flow->dl_vlan), - ETH_ADDR_ARGS(flow->dl_src), ETH_ADDR_ARGS(flow->dl_dst), - ntohs(flow->dl_type), flow->nw_proto, - IP_ARGS(&flow->nw_src), IP_ARGS(&flow->nw_dst), - ntohs(flow->tp_src), ntohs(flow->tp_dst)); + ds_put_format(ds, "tunnel%08"PRIx32":in_port%04"PRIx16 + ":vlan%"PRIu16":pcp%"PRIu8 + " mac"ETH_ADDR_FMT"->"ETH_ADDR_FMT + " type%04"PRIx16 + " proto%"PRIu8 + " tos%"PRIu8 + " ip"IP_FMT"->"IP_FMT + " port%"PRIu16"->%"PRIu16, + ntohl(flow->tun_id), + flow->in_port, + ntohs(flow->dl_vlan), + flow->dl_vlan_pcp, + ETH_ADDR_ARGS(flow->dl_src), + ETH_ADDR_ARGS(flow->dl_dst), + ntohs(flow->dl_type), + flow->nw_proto, + flow->nw_tos, + IP_ARGS(&flow->nw_src), + IP_ARGS(&flow->nw_dst), + ntohs(flow->tp_src), + ntohs(flow->tp_dst)); } void -flow_print(FILE *stream, const flow_t *flow) +flow_print(FILE *stream, const struct flow *flow) { char *s = flow_to_string(flow); fputs(s, stream); free(s); } + +/* flow_wildcards functions. */ + +/* Given the wildcard bit count in bits 'shift' through 'shift + 5' (inclusive) + * of 'wildcards', returns a 32-bit bit mask with a 1 in each bit that must + * match and a 0 in each bit that is wildcarded. + * + * The bits in 'wildcards' are in the format used in enum ofp_flow_wildcards: 0 + * is exact match, 1 ignores the LSB, 2 ignores the 2 least-significant bits, + * ..., 32 and higher wildcard the entire field. This is the *opposite* of the + * usual convention where e.g. /24 indicates that 8 bits (not 24 bits) are + * wildcarded. */ +ovs_be32 +flow_nw_bits_to_mask(uint32_t wildcards, int shift) +{ + wildcards = (wildcards >> shift) & 0x3f; + return wildcards < 32 ? htonl(~((1u << wildcards) - 1)) : 0; +} + +/* Return 'wildcards' in "normal form": + * + * - Forces unknown bits to 0. + * + * - Forces nw_src and nw_dst masks greater than 32 to exactly 32. + */ +static inline uint32_t +flow_wildcards_normalize(uint32_t wildcards) +{ + wildcards &= wildcards & (OVSFW_ALL | FWW_ALL); + if (wildcards & (0x20 << OFPFW_NW_SRC_SHIFT)) { + wildcards &= ~(0x1f << OFPFW_NW_SRC_SHIFT); + } + if (wildcards & (0x20 << OFPFW_NW_DST_SHIFT)) { + wildcards &= ~(0x1f << OFPFW_NW_DST_SHIFT); + } + return wildcards; +} + +/* Initializes 'wc' from 'wildcards', which may be any combination of the + * OFPFW_* and OVSFW_* wildcard bits. + * + * All registers (NXM_NX_REG*) are always completely wildcarded, because + * 'wildcards' doesn't have enough bits to give the details on which + * particular bits should be wildcarded (if any). The caller may use + * flow_wildcards_set_reg_mask() to update the register wildcard masks. */ +void +flow_wildcards_init(struct flow_wildcards *wc, uint32_t wildcards) +{ + wc->wildcards = flow_wildcards_normalize(wildcards) | FWW_REGS; + wc->nw_src_mask = flow_nw_bits_to_mask(wc->wildcards, OFPFW_NW_SRC_SHIFT); + wc->nw_dst_mask = flow_nw_bits_to_mask(wc->wildcards, OFPFW_NW_DST_SHIFT); + memset(wc->reg_masks, 0, sizeof wc->reg_masks); +} + +/* Initializes 'wc' as an exact-match set of wildcards; that is, 'wc' does not + * wildcard any bits or fields. */ +void +flow_wildcards_init_exact(struct flow_wildcards *wc) +{ + wc->wildcards = 0; + wc->nw_src_mask = htonl(UINT32_MAX); + wc->nw_dst_mask = htonl(UINT32_MAX); + memset(wc->reg_masks, 0xff, sizeof wc->reg_masks); +} + +static inline uint32_t +combine_nw_bits(uint32_t wb1, uint32_t wb2, int shift) +{ + uint32_t sb1 = (wb1 >> shift) & 0x3f; + uint32_t sb2 = (wb2 >> shift) & 0x3f; + return MAX(sb1, sb2) << shift; +} + +/* Initializes 'dst' as the combination of wildcards in 'src1' and 'src2'. + * That is, a bit or a field is wildcarded in 'dst' if it is wildcarded in + * 'src1' or 'src2' or both. */ +void +flow_wildcards_combine(struct flow_wildcards *dst, + const struct flow_wildcards *src1, + const struct flow_wildcards *src2) +{ + uint32_t wb1 = src1->wildcards; + uint32_t wb2 = src2->wildcards; + int i; + + dst->wildcards = (wb1 | wb2) & ~(OFPFW_NW_SRC_MASK | OFPFW_NW_DST_MASK); + dst->wildcards |= combine_nw_bits(wb1, wb2, OFPFW_NW_SRC_SHIFT); + dst->wildcards |= combine_nw_bits(wb1, wb2, OFPFW_NW_DST_SHIFT); + dst->nw_src_mask = src1->nw_src_mask & src2->nw_src_mask; + dst->nw_dst_mask = src1->nw_dst_mask & src2->nw_dst_mask; + for (i = 0; i < FLOW_N_REGS; i++) { + dst->reg_masks[i] = src1->reg_masks[i] & src2->reg_masks[i]; + } +} + +/* Returns a hash of the wildcards in 'wc'. */ +uint32_t +flow_wildcards_hash(const struct flow_wildcards *wc) +{ + /* There is no need to include nw_src_mask or nw_dst_mask because they do + * not add any information (they can be computed from wc->wildcards). */ + BUILD_ASSERT_DECL(sizeof wc->wildcards == 4); + BUILD_ASSERT_DECL(sizeof wc->reg_masks == 4 * FLOW_N_REGS); + BUILD_ASSERT_DECL(offsetof(struct flow_wildcards, wildcards) == 0); + BUILD_ASSERT_DECL(offsetof(struct flow_wildcards, reg_masks) == 4); + return hash_words((const uint32_t *) wc, 1 + FLOW_N_REGS, 0); +} + +/* Returns true if 'a' and 'b' represent the same wildcards, false if they are + * different. */ +bool +flow_wildcards_equal(const struct flow_wildcards *a, + const struct flow_wildcards *b) +{ + int i; + + if (a->wildcards != b->wildcards) { + return false; + } + + for (i = 0; i < FLOW_N_REGS; i++) { + if (a->reg_masks[i] != b->reg_masks[i]) { + return false; + } + } + + return true; +} + +/* Returns true if at least one bit or field is wildcarded in 'a' but not in + * 'b', false otherwise. */ +bool +flow_wildcards_has_extra(const struct flow_wildcards *a, + const struct flow_wildcards *b) +{ + int i; + + for (i = 0; i < FLOW_N_REGS; i++) { + if ((a->reg_masks[i] & b->reg_masks[i]) != b->reg_masks[i]) { + return true; + } + } + +#define OFPFW_NW_MASK (OFPFW_NW_SRC_MASK | OFPFW_NW_DST_MASK) + return ((a->wildcards & ~(b->wildcards | OFPFW_NW_MASK)) + || (a->nw_src_mask & b->nw_src_mask) != b->nw_src_mask + || (a->nw_dst_mask & b->nw_dst_mask) != b->nw_dst_mask); +} + +static int +count_ones(ovs_be32 mask) +{ +#if __GNUC__ >= 4 + return __builtin_popcount(mask); +#else + int bits; + + for (bits = 0; mask; bits++) { + mask &= mask - 1; + } + + return bits; +#endif +} + +static bool +set_nw_mask(struct flow_wildcards *wc, ovs_be32 mask, + ovs_be32 *maskp, int shift) +{ + int wcbits = 32 - count_ones(mask); + if (flow_nw_bits_to_mask(wcbits, 0) == mask) { + wc->wildcards &= ~(0x3f << shift); + wc->wildcards |= wcbits << shift; + *maskp = mask; + return true; + } else { + return false; + } +} + +/* Sets the IP (or ARP) source wildcard mask to CIDR 'mask' (consisting of N + * high-order 1-bit and 32-N low-order 0-bits). Returns true if successful, + * false if 'mask' is not a CIDR mask. */ +bool +flow_wildcards_set_nw_src_mask(struct flow_wildcards *wc, ovs_be32 mask) +{ + return set_nw_mask(wc, mask, &wc->nw_src_mask, OFPFW_NW_SRC_SHIFT); +} + +/* Sets the IP (or ARP) destination wildcard mask to CIDR 'mask' (consisting of + * N high-order 1-bit and 32-N low-order 0-bits). Returns true if successful, + * false if 'mask' is not a CIDR mask. */ +bool +flow_wildcards_set_nw_dst_mask(struct flow_wildcards *wc, ovs_be32 mask) +{ + return set_nw_mask(wc, mask, &wc->nw_dst_mask, OFPFW_NW_DST_SHIFT); +} + +/* Sets the wildcard mask for register 'idx' in 'wc' to 'mask'. + * (A 0-bit indicates a wildcard bit.) */ +void +flow_wildcards_set_reg_mask(struct flow_wildcards *wc, int idx, uint32_t mask) +{ + if (mask != wc->reg_masks[idx]) { + wc->reg_masks[idx] = mask; + if (mask != UINT32_MAX) { + wc->wildcards |= FWW_REGS; + } else { + int i; + + for (i = 0; i < FLOW_N_REGS; i++) { + if (wc->reg_masks[i] != UINT32_MAX) { + wc->wildcards |= FWW_REGS; + return; + } + } + wc->wildcards &= ~FWW_REGS; + } + } +}