X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fflow.c;h=5ba3e10df435dfa569e6712d850c59456e3619a9;hb=df778240e1e311f7eba9dfda4f5f8bf0f915ae5f;hp=d22890e54705fee67b43b21bbed2f021980252e3;hpb=834377ea559d665520910968358c522f30d3eb93;p=openvswitch diff --git a/lib/flow.c b/lib/flow.c index d22890e5..5ba3e10d 100644 --- a/lib/flow.c +++ b/lib/flow.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2008, 2009, 2010 Nicira Networks. + * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -16,20 +16,27 @@ #include #include #include "flow.h" +#include +#include #include #include +#include +#include #include #include +#include "byte-order.h" #include "coverage.h" #include "dynamic-string.h" #include "hash.h" #include "ofpbuf.h" #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); + +COVERAGE_DEFINE(flow_extract); static struct arp_eth_header * pull_arp(struct ofpbuf *packet) @@ -51,7 +58,7 @@ 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; @@ -64,227 +71,444 @@ 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 struct icmp6_hdr * +pull_icmpv6(struct ofpbuf *packet) { - return ofpbuf_try_pull(packet, ETH_HEADER_LEN); + return ofpbuf_try_pull(packet, sizeof(struct icmp6_hdr)); } -static struct vlan_header * -pull_vlan(struct ofpbuf *packet) +static void +parse_vlan(struct ofpbuf *b, struct flow *flow) { - return ofpbuf_try_pull(packet, VLAN_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->vlan_tci = qp->tci | htons(VLAN_CFI); + } +} + +static ovs_be16 +parse_ethertype(struct ofpbuf *b) +{ + struct llc_snap_header *llc; + ovs_be16 proto; + + proto = *(ovs_be16 *) ofpbuf_pull(b, sizeof proto); + if (ntohs(proto) >= ETH_TYPE_MIN) { + return proto; + } + + if (b->size < sizeof *llc) { + return htons(FLOW_DL_TYPE_NONE); + } + + 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(FLOW_DL_TYPE_NONE); + } + + ofpbuf_pull(b, sizeof *llc); + return llc->snap.snap_type; +} + +static int +parse_ipv6(struct ofpbuf *packet, struct flow *flow) +{ + const struct ip6_hdr *nh; + ovs_be32 tc_flow; + int nexthdr; + + nh = ofpbuf_try_pull(packet, sizeof *nh); + if (!nh) { + return EINVAL; + } + + nexthdr = nh->ip6_nxt; + + flow->ipv6_src = nh->ip6_src; + flow->ipv6_dst = nh->ip6_dst; + + tc_flow = get_unaligned_be32(&nh->ip6_flow); + flow->nw_tos = ntohl(tc_flow) >> 20; + flow->ipv6_label = tc_flow & htonl(IPV6_LABEL_MASK); + flow->nw_ttl = nh->ip6_hlim; + flow->nw_proto = IPPROTO_NONE; + + while (1) { + if ((nexthdr != IPPROTO_HOPOPTS) + && (nexthdr != IPPROTO_ROUTING) + && (nexthdr != IPPROTO_DSTOPTS) + && (nexthdr != IPPROTO_AH) + && (nexthdr != IPPROTO_FRAGMENT)) { + /* It's either a terminal header (e.g., TCP, UDP) or one we + * don't understand. In either case, we're done with the + * packet, so use it to fill in 'nw_proto'. */ + break; + } + + /* We only verify that at least 8 bytes of the next header are + * available, but many of these headers are longer. Ensure that + * accesses within the extension header are within those first 8 + * bytes. All extension headers are required to be at least 8 + * bytes. */ + if (packet->size < 8) { + return EINVAL; + } + + if ((nexthdr == IPPROTO_HOPOPTS) + || (nexthdr == IPPROTO_ROUTING) + || (nexthdr == IPPROTO_DSTOPTS)) { + /* These headers, while different, have the fields we care about + * in the same location and with the same interpretation. */ + const struct ip6_ext *ext_hdr = (struct ip6_ext *)packet->data; + nexthdr = ext_hdr->ip6e_nxt; + if (!ofpbuf_try_pull(packet, (ext_hdr->ip6e_len + 1) * 8)) { + return EINVAL; + } + } else if (nexthdr == IPPROTO_AH) { + /* A standard AH definition isn't available, but the fields + * we care about are in the same location as the generic + * option header--only the header length is calculated + * differently. */ + const struct ip6_ext *ext_hdr = (struct ip6_ext *)packet->data; + nexthdr = ext_hdr->ip6e_nxt; + if (!ofpbuf_try_pull(packet, (ext_hdr->ip6e_len + 2) * 4)) { + return EINVAL; + } + } else if (nexthdr == IPPROTO_FRAGMENT) { + const struct ip6_frag *frag_hdr = (struct ip6_frag *)packet->data; + + nexthdr = frag_hdr->ip6f_nxt; + if (!ofpbuf_try_pull(packet, sizeof *frag_hdr)) { + return EINVAL; + } + + /* We only process the first fragment. */ + if (frag_hdr->ip6f_offlg != htons(0)) { + if ((frag_hdr->ip6f_offlg & IP6F_OFF_MASK) == htons(0)) { + flow->nw_frag = FLOW_NW_FRAG_ANY; + } else { + flow->nw_frag |= FLOW_NW_FRAG_LATER; + nexthdr = IPPROTO_FRAGMENT; + break; + } + } + } + } + + flow->nw_proto = nexthdr; + return 0; +} + +static void +parse_tcp(struct ofpbuf *packet, struct ofpbuf *b, struct flow *flow) +{ + 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; + } +} + +static void +parse_udp(struct ofpbuf *packet, struct ofpbuf *b, struct flow *flow) +{ + 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; + } +} + +static bool +parse_icmpv6(struct ofpbuf *b, struct flow *flow) +{ + const struct icmp6_hdr *icmp = pull_icmpv6(b); + + if (!icmp) { + return false; + } + + /* 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. */ + flow->tp_src = htons(icmp->icmp6_type); + flow->tp_dst = htons(icmp->icmp6_code); + + if (icmp->icmp6_code == 0 && + (icmp->icmp6_type == ND_NEIGHBOR_SOLICIT || + icmp->icmp6_type == ND_NEIGHBOR_ADVERT)) { + const struct in6_addr *nd_target; + + nd_target = ofpbuf_try_pull(b, sizeof *nd_target); + if (!nd_target) { + return false; + } + flow->nd_target = *nd_target; + + while (b->size >= 8) { + /* The minimum size of an option is 8 bytes, which also is + * the size of Ethernet link-layer options. */ + const struct nd_opt_hdr *nd_opt = b->data; + int opt_len = nd_opt->nd_opt_len * 8; + + if (!opt_len || opt_len > b->size) { + goto invalid; + } + + /* Store the link layer address if the appropriate option is + * provided. It is considered an error if the same link + * layer option is specified twice. */ + if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LINKADDR + && opt_len == 8) { + if (eth_addr_is_zero(flow->arp_sha)) { + memcpy(flow->arp_sha, nd_opt + 1, ETH_ADDR_LEN); + } else { + goto invalid; + } + } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LINKADDR + && opt_len == 8) { + if (eth_addr_is_zero(flow->arp_tha)) { + memcpy(flow->arp_tha, nd_opt + 1, ETH_ADDR_LEN); + } else { + goto invalid; + } + } + + if (!ofpbuf_try_pull(b, opt_len)) { + goto invalid; + } + } + } + + return true; + +invalid: + memset(&flow->nd_target, 0, sizeof(flow->nd_target)); + memset(flow->arp_sha, 0, sizeof(flow->arp_sha)); + memset(flow->arp_tha, 0, sizeof(flow->arp_tha)); + + return false; + } -/* Returns 1 if 'packet' is an IP fragment, 0 otherwise. */ -int -flow_extract(struct ofpbuf *packet, uint16_t in_port, flow_t *flow) +/* Initializes 'flow' members from 'packet', 'skb_priority', 'tun_id', and + * 'ofp_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. + */ +void +flow_extract(struct ofpbuf *packet, uint32_t skb_priority, ovs_be64 tun_id, + uint16_t ofp_in_port, struct flow *flow) { struct ofpbuf b = *packet; struct eth_header *eth; - int retval = 0; COVERAGE_INC(flow_extract); memset(flow, 0, sizeof *flow); - flow->dl_vlan = htons(OFP_VLAN_NONE); - flow->in_port = in_port; + flow->tun_id = tun_id; + flow->in_port = ofp_in_port; + flow->skb_priority = skb_priority; 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 (b.size < sizeof *eth) { + return; + } + + /* 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, vlan_tci. */ + 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) { + packet->l4 = b.data; + + flow->nw_src = get_unaligned_be32(&nh->ip_src); + flow->nw_dst = get_unaligned_be32(&nh->ip_dst); + flow->nw_proto = nh->ip_proto; + + flow->nw_tos = nh->ip_tos; + if (IP_IS_FRAGMENT(nh->ip_frag_off)) { + flow->nw_frag = FLOW_NW_FRAG_ANY; + if (nh->ip_frag_off & htons(IP_FRAG_OFF_MASK)) { + flow->nw_frag |= FLOW_NW_FRAG_LATER; + } } - 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)); + flow->nw_ttl = nh->ip_ttl; + + if (!(nh->ip_frag_off & htons(IP_FRAG_OFF_MASK))) { + if (flow->nw_proto == IPPROTO_TCP) { + parse_tcp(packet, &b, flow); + } else if (flow->nw_proto == IPPROTO_UDP) { + parse_udp(packet, &b, flow); + } else if (flow->nw_proto == IPPROTO_ICMP) { + const struct icmp_header *icmp = pull_icmp(&b); + if (icmp) { + flow->tp_src = htons(icmp->icmp_type); + flow->tp_dst = htons(icmp->icmp_code); + packet->l7 = b.data; + } + } } } + } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) { + if (parse_ipv6(&b, flow)) { + return; + } - /* 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); - flow->dl_vlan_pcp = (ntohs(vh->vlan_tci) & 0xe000) >> 13; + packet->l4 = b.data; + if (flow->nw_proto == IPPROTO_TCP) { + parse_tcp(packet, &b, flow); + } else if (flow->nw_proto == IPPROTO_UDP) { + parse_udp(packet, &b, flow); + } else if (flow->nw_proto == IPPROTO_ICMPV6) { + if (parse_icmpv6(&b, flow)) { + packet->l7 = b.data; } } - 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_tos = nh->ip_tos & 0xfc; - 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; - } - } - } 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; + memcpy(flow->arp_sha, arp->ar_sha, ETH_ADDR_LEN); + memcpy(flow->arp_tha, arp->ar_tha, ETH_ADDR_LEN); } } } - return retval; } -/* Extracts the flow stats for a packet. The 'flow' and 'packet' - * arguments must have been initialized through a call to flow_extract(). - */ +/* For every bit of a field that is wildcarded in 'wildcards', sets the + * corresponding bit in 'flow' to zero. */ void -flow_extract_stats(const flow_t *flow, struct ofpbuf *packet, - struct odp_flow_stats *stats) +flow_zero_wildcards(struct flow *flow, const struct flow_wildcards *wildcards) { - memset(stats, '\0', sizeof(*stats)); + const flow_wildcards_t wc = wildcards->wildcards; + int i; - 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); - } - } + BUILD_ASSERT_DECL(FLOW_WC_SEQ == 14); - stats->n_bytes = packet->size; - stats->n_packets = 1; + for (i = 0; i < FLOW_N_REGS; i++) { + flow->regs[i] &= wildcards->reg_masks[i]; + } + flow->tun_id &= wildcards->tun_id_mask; + flow->metadata &= wildcards->metadata_mask; + flow->nw_src &= wildcards->nw_src_mask; + flow->nw_dst &= wildcards->nw_dst_mask; + if (wc & FWW_IN_PORT) { + flow->in_port = 0; + } + flow->vlan_tci &= wildcards->vlan_tci_mask; + if (wc & FWW_DL_TYPE) { + flow->dl_type = htons(0); + } + flow->tp_src &= wildcards->tp_src_mask; + flow->tp_dst &= wildcards->tp_dst_mask; + eth_addr_bitand(flow->dl_src, wildcards->dl_src_mask, flow->dl_src); + eth_addr_bitand(flow->dl_dst, wildcards->dl_dst_mask, flow->dl_dst); + if (wc & FWW_NW_PROTO) { + flow->nw_proto = 0; + } + flow->ipv6_label &= wildcards->ipv6_label_mask; + if (wc & FWW_NW_DSCP) { + flow->nw_tos &= ~IP_DSCP_MASK; + } + if (wc & FWW_NW_ECN) { + flow->nw_tos &= ~IP_ECN_MASK; + } + if (wc & FWW_NW_TTL) { + flow->nw_ttl = 0; + } + flow->nw_frag &= wildcards->nw_frag_mask; + eth_addr_bitand(flow->arp_sha, wildcards->arp_sha_mask, flow->arp_sha); + eth_addr_bitand(flow->arp_tha, wildcards->arp_tha_mask, flow->arp_tha); + flow->ipv6_src = ipv6_addr_bitand(&flow->ipv6_src, + &wildcards->ipv6_src_mask); + flow->ipv6_dst = ipv6_addr_bitand(&flow->ipv6_dst, + &wildcards->ipv6_dst_mask); + flow->nd_target = ipv6_addr_bitand(&flow->nd_target, + &wildcards->nd_target_mask); + flow->skb_priority = 0; } -/* Extract 'flow' with 'wildcards' into the OpenFlow match structure - * 'match'. */ +/* Initializes 'fmd' with the metadata found in 'flow'. */ void -flow_to_match(const flow_t *flow, uint32_t wildcards, struct ofp_match *match) -{ - 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; - memset(match->pad1, '\0', sizeof match->pad1); - memset(match->pad2, '\0', sizeof match->pad2); -} +flow_get_metadata(const struct flow *flow, struct flow_metadata *fmd) +{ + BUILD_ASSERT_DECL(FLOW_WC_SEQ == 14); -void -flow_from_match(flow_t *flow, uint32_t *wildcards, - const struct ofp_match *match) -{ - if (wildcards) { - *wildcards = ntohl(match->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; - memset(flow->reserved, 0, sizeof flow->reserved); + fmd->tun_id = flow->tun_id; + fmd->tun_id_mask = htonll(UINT64_MAX); + + fmd->metadata = flow->metadata; + fmd->metadata_mask = htonll(UINT64_MAX); + + memcpy(fmd->regs, flow->regs, sizeof fmd->regs); + memset(fmd->reg_masks, 0xff, sizeof fmd->reg_masks); + + fmd->in_port = flow->in_port; } 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); @@ -292,22 +516,564 @@ 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:pcp%d mac"ETH_ADDR_FMT - "->"ETH_ADDR_FMT" type%04x proto%"PRId8" tos%"PRIu8 - " ip"IP_FMT"->"IP_FMT" port%d->%d", - 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)); + ds_put_format(ds, "priority:%"PRIu32 + ",tunnel:%#"PRIx64 + ",metadata:%#"PRIx64 + ",in_port:%04"PRIx16, + flow->skb_priority, + ntohll(flow->tun_id), + ntohll(flow->metadata), + flow->in_port); + + ds_put_format(ds, ",tci("); + if (flow->vlan_tci) { + ds_put_format(ds, "vlan:%"PRIu16",pcp:%d", + vlan_tci_to_vid(flow->vlan_tci), + vlan_tci_to_pcp(flow->vlan_tci)); + } else { + ds_put_char(ds, '0'); + } + ds_put_format(ds, ") mac("ETH_ADDR_FMT"->"ETH_ADDR_FMT + ") type:%04"PRIx16, + ETH_ADDR_ARGS(flow->dl_src), + ETH_ADDR_ARGS(flow->dl_dst), + ntohs(flow->dl_type)); + + if (flow->dl_type == htons(ETH_TYPE_IPV6)) { + ds_put_format(ds, " label:%#"PRIx32" proto:%"PRIu8" tos:%#"PRIx8 + " ttl:%"PRIu8" ipv6(", + ntohl(flow->ipv6_label), flow->nw_proto, + flow->nw_tos, flow->nw_ttl); + print_ipv6_addr(ds, &flow->ipv6_src); + ds_put_cstr(ds, "->"); + print_ipv6_addr(ds, &flow->ipv6_dst); + ds_put_char(ds, ')'); + } else { + ds_put_format(ds, " proto:%"PRIu8" tos:%#"PRIx8" ttl:%"PRIu8 + " ip("IP_FMT"->"IP_FMT")", + flow->nw_proto, flow->nw_tos, flow->nw_ttl, + IP_ARGS(&flow->nw_src), IP_ARGS(&flow->nw_dst)); + } + if (flow->nw_frag) { + ds_put_format(ds, " frag(%s)", + flow->nw_frag == FLOW_NW_FRAG_ANY ? "first" + : flow->nw_frag == (FLOW_NW_FRAG_ANY | FLOW_NW_FRAG_LATER) + ? "later" : ""); + } + if (flow->tp_src || flow->tp_dst) { + ds_put_format(ds, " port(%"PRIu16"->%"PRIu16")", + ntohs(flow->tp_src), ntohs(flow->tp_dst)); + } + if (!eth_addr_is_zero(flow->arp_sha) || !eth_addr_is_zero(flow->arp_tha)) { + ds_put_format(ds, " arp_ha("ETH_ADDR_FMT"->"ETH_ADDR_FMT")", + ETH_ADDR_ARGS(flow->arp_sha), + ETH_ADDR_ARGS(flow->arp_tha)); + } } 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. */ + +/* Initializes 'wc' as a set of wildcards that matches every packet. */ +void +flow_wildcards_init_catchall(struct flow_wildcards *wc) +{ + BUILD_ASSERT_DECL(FLOW_WC_SEQ == 14); + + wc->wildcards = FWW_ALL; + wc->tun_id_mask = htonll(0); + wc->nw_src_mask = htonl(0); + wc->nw_dst_mask = htonl(0); + wc->ipv6_src_mask = in6addr_any; + wc->ipv6_dst_mask = in6addr_any; + wc->ipv6_label_mask = htonl(0); + wc->nd_target_mask = in6addr_any; + memset(wc->reg_masks, 0, sizeof wc->reg_masks); + wc->metadata_mask = htonll(0); + wc->vlan_tci_mask = htons(0); + wc->nw_frag_mask = 0; + wc->tp_src_mask = htons(0); + wc->tp_dst_mask = htons(0); + memset(wc->dl_src_mask, 0, ETH_ADDR_LEN); + memset(wc->dl_dst_mask, 0, ETH_ADDR_LEN); + memset(wc->arp_sha_mask, 0, ETH_ADDR_LEN); + memset(wc->arp_tha_mask, 0, ETH_ADDR_LEN); + memset(wc->zeros, 0, sizeof wc->zeros); +} + +/* 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) +{ + BUILD_ASSERT_DECL(FLOW_WC_SEQ == 14); + + wc->wildcards = 0; + wc->tun_id_mask = htonll(UINT64_MAX); + wc->nw_src_mask = htonl(UINT32_MAX); + wc->nw_dst_mask = htonl(UINT32_MAX); + wc->ipv6_src_mask = in6addr_exact; + wc->ipv6_dst_mask = in6addr_exact; + wc->ipv6_label_mask = htonl(UINT32_MAX); + wc->nd_target_mask = in6addr_exact; + memset(wc->reg_masks, 0xff, sizeof wc->reg_masks); + wc->metadata_mask = htonll(UINT64_MAX); + wc->vlan_tci_mask = htons(UINT16_MAX); + wc->nw_frag_mask = UINT8_MAX; + wc->tp_src_mask = htons(UINT16_MAX); + wc->tp_dst_mask = htons(UINT16_MAX); + memset(wc->dl_src_mask, 0xff, ETH_ADDR_LEN); + memset(wc->dl_dst_mask, 0xff, ETH_ADDR_LEN); + memset(wc->arp_sha_mask, 0xff, ETH_ADDR_LEN); + memset(wc->arp_tha_mask, 0xff, ETH_ADDR_LEN); + memset(wc->zeros, 0, sizeof wc->zeros); +} + +/* Returns true if 'wc' is exact-match, false if 'wc' wildcards any bits or + * fields. */ +bool +flow_wildcards_is_exact(const struct flow_wildcards *wc) +{ + int i; + + BUILD_ASSERT_DECL(FLOW_WC_SEQ == 14); + + if (wc->wildcards + || wc->tun_id_mask != htonll(UINT64_MAX) + || wc->nw_src_mask != htonl(UINT32_MAX) + || wc->nw_dst_mask != htonl(UINT32_MAX) + || wc->tp_src_mask != htons(UINT16_MAX) + || wc->tp_dst_mask != htons(UINT16_MAX) + || wc->vlan_tci_mask != htons(UINT16_MAX) + || wc->metadata_mask != htonll(UINT64_MAX) + || !eth_mask_is_exact(wc->dl_src_mask) + || !eth_mask_is_exact(wc->dl_dst_mask) + || !eth_mask_is_exact(wc->arp_sha_mask) + || !eth_mask_is_exact(wc->arp_tha_mask) + || !ipv6_mask_is_exact(&wc->ipv6_src_mask) + || !ipv6_mask_is_exact(&wc->ipv6_dst_mask) + || wc->ipv6_label_mask != htonl(UINT32_MAX) + || !ipv6_mask_is_exact(&wc->nd_target_mask) + || wc->nw_frag_mask != UINT8_MAX) { + return false; + } + + for (i = 0; i < FLOW_N_REGS; i++) { + if (wc->reg_masks[i] != UINT32_MAX) { + return false; + } + } + + return true; +} + +/* Returns true if 'wc' matches every packet, false if 'wc' fixes any bits or + * fields. */ +bool +flow_wildcards_is_catchall(const struct flow_wildcards *wc) +{ + int i; + + BUILD_ASSERT_DECL(FLOW_WC_SEQ == 14); + + if (wc->wildcards != FWW_ALL + || wc->tun_id_mask != htonll(0) + || wc->nw_src_mask != htonl(0) + || wc->nw_dst_mask != htonl(0) + || wc->tp_src_mask != htons(0) + || wc->tp_dst_mask != htons(0) + || wc->vlan_tci_mask != htons(0) + || wc->metadata_mask != htonll(0) + || !eth_addr_is_zero(wc->dl_src_mask) + || !eth_addr_is_zero(wc->dl_dst_mask) + || !eth_addr_is_zero(wc->arp_sha_mask) + || !eth_addr_is_zero(wc->arp_tha_mask) + || !ipv6_mask_is_any(&wc->ipv6_src_mask) + || !ipv6_mask_is_any(&wc->ipv6_dst_mask) + || wc->ipv6_label_mask != htonl(0) + || !ipv6_mask_is_any(&wc->nd_target_mask) + || wc->nw_frag_mask != 0) { + return false; + } + + for (i = 0; i < FLOW_N_REGS; i++) { + if (wc->reg_masks[i] != 0) { + return false; + } + } + + return true; +} + +/* 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) +{ + int i; + + BUILD_ASSERT_DECL(FLOW_WC_SEQ == 14); + + dst->wildcards = src1->wildcards | src2->wildcards; + dst->tun_id_mask = src1->tun_id_mask & src2->tun_id_mask; + dst->nw_src_mask = src1->nw_src_mask & src2->nw_src_mask; + dst->nw_dst_mask = src1->nw_dst_mask & src2->nw_dst_mask; + dst->ipv6_src_mask = ipv6_addr_bitand(&src1->ipv6_src_mask, + &src2->ipv6_src_mask); + dst->ipv6_dst_mask = ipv6_addr_bitand(&src1->ipv6_dst_mask, + &src2->ipv6_dst_mask); + dst->ipv6_label_mask = src1->ipv6_label_mask & src2->ipv6_label_mask; + dst->nd_target_mask = ipv6_addr_bitand(&src1->nd_target_mask, + &src2->nd_target_mask); + for (i = 0; i < FLOW_N_REGS; i++) { + dst->reg_masks[i] = src1->reg_masks[i] & src2->reg_masks[i]; + } + dst->metadata_mask = src1->metadata_mask & src2->metadata_mask; + dst->vlan_tci_mask = src1->vlan_tci_mask & src2->vlan_tci_mask; + dst->tp_src_mask = src1->tp_src_mask & src2->tp_src_mask; + dst->tp_dst_mask = src1->tp_dst_mask & src2->tp_dst_mask; + eth_addr_bitand(src1->dl_src_mask, src2->dl_src_mask, dst->dl_src_mask); + eth_addr_bitand(src1->dl_dst_mask, src2->dl_dst_mask, dst->dl_dst_mask); + eth_addr_bitand(src1->arp_sha_mask, src2->arp_sha_mask, dst->arp_sha_mask); + eth_addr_bitand(src1->arp_tha_mask, src2->arp_tha_mask, dst->arp_tha_mask); +} + +/* Returns a hash of the wildcards in 'wc'. */ +uint32_t +flow_wildcards_hash(const struct flow_wildcards *wc, uint32_t basis) +{ + /* If you change struct flow_wildcards and thereby trigger this + * assertion, please check that the new struct flow_wildcards has no holes + * in it before you update the assertion. */ + BUILD_ASSERT_DECL(sizeof *wc == 112 + FLOW_N_REGS * 4); + return hash_bytes(wc, sizeof *wc, basis); +} + +/* 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; + + BUILD_ASSERT_DECL(FLOW_WC_SEQ == 14); + + if (a->wildcards != b->wildcards + || a->tun_id_mask != b->tun_id_mask + || a->nw_src_mask != b->nw_src_mask + || a->nw_dst_mask != b->nw_dst_mask + || a->vlan_tci_mask != b->vlan_tci_mask + || a->metadata_mask != b->metadata_mask + || !ipv6_addr_equals(&a->ipv6_src_mask, &b->ipv6_src_mask) + || !ipv6_addr_equals(&a->ipv6_dst_mask, &b->ipv6_dst_mask) + || a->ipv6_label_mask != b->ipv6_label_mask + || !ipv6_addr_equals(&a->nd_target_mask, &b->nd_target_mask) + || a->tp_src_mask != b->tp_src_mask + || a->tp_dst_mask != b->tp_dst_mask + || !eth_addr_equals(a->dl_src_mask, b->dl_src_mask) + || !eth_addr_equals(a->dl_dst_mask, b->dl_dst_mask) + || !eth_addr_equals(a->arp_sha_mask, b->arp_sha_mask) + || !eth_addr_equals(a->arp_tha_mask, b->arp_tha_mask)) { + 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; + uint8_t eth_masked[ETH_ADDR_LEN]; + struct in6_addr ipv6_masked; + + BUILD_ASSERT_DECL(FLOW_WC_SEQ == 14); + + for (i = 0; i < FLOW_N_REGS; i++) { + if ((a->reg_masks[i] & b->reg_masks[i]) != b->reg_masks[i]) { + return true; + } + } + + eth_addr_bitand(a->dl_src_mask, b->dl_src_mask, eth_masked); + if (!eth_addr_equals(eth_masked, b->dl_src_mask)) { + return true; + } + + eth_addr_bitand(a->dl_dst_mask, b->dl_dst_mask, eth_masked); + if (!eth_addr_equals(eth_masked, b->dl_dst_mask)) { + return true; + } + + eth_addr_bitand(a->arp_sha_mask, b->arp_sha_mask, eth_masked); + if (!eth_addr_equals(eth_masked, b->arp_sha_mask)) { + return true; + } + + eth_addr_bitand(a->arp_tha_mask, b->arp_tha_mask, eth_masked); + if (!eth_addr_equals(eth_masked, b->arp_tha_mask)) { + return true; + } + + ipv6_masked = ipv6_addr_bitand(&a->ipv6_src_mask, &b->ipv6_src_mask); + if (!ipv6_addr_equals(&ipv6_masked, &b->ipv6_src_mask)) { + return true; + } + + ipv6_masked = ipv6_addr_bitand(&a->ipv6_dst_mask, &b->ipv6_dst_mask); + if (!ipv6_addr_equals(&ipv6_masked, &b->ipv6_dst_mask)) { + return true; + } + + ipv6_masked = ipv6_addr_bitand(&a->nd_target_mask, &b->nd_target_mask); + if (!ipv6_addr_equals(&ipv6_masked, &b->nd_target_mask)) { + return true; + } + + return (a->wildcards & ~b->wildcards + || (a->tun_id_mask & b->tun_id_mask) != b->tun_id_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 + || (a->ipv6_label_mask & b->ipv6_label_mask) != b->ipv6_label_mask + || (a->vlan_tci_mask & b->vlan_tci_mask) != b->vlan_tci_mask + || (a->metadata_mask & b->metadata_mask) != b->metadata_mask + || (a->tp_src_mask & b->tp_src_mask) != b->tp_src_mask + || (a->tp_dst_mask & b->tp_dst_mask) != b->tp_dst_mask); +} + +/* 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) +{ + wc->reg_masks[idx] = mask; +} + +/* Hashes 'flow' based on its L2 through L4 protocol information. */ +uint32_t +flow_hash_symmetric_l4(const struct flow *flow, uint32_t basis) +{ + struct { + union { + ovs_be32 ipv4_addr; + struct in6_addr ipv6_addr; + }; + ovs_be16 eth_type; + ovs_be16 vlan_tci; + ovs_be16 tp_port; + uint8_t eth_addr[ETH_ADDR_LEN]; + uint8_t ip_proto; + } fields; + + int i; + + memset(&fields, 0, sizeof fields); + for (i = 0; i < ETH_ADDR_LEN; i++) { + fields.eth_addr[i] = flow->dl_src[i] ^ flow->dl_dst[i]; + } + fields.vlan_tci = flow->vlan_tci & htons(VLAN_VID_MASK); + fields.eth_type = flow->dl_type; + + /* UDP source and destination port are not taken into account because they + * will not necessarily be symmetric in a bidirectional flow. */ + if (fields.eth_type == htons(ETH_TYPE_IP)) { + fields.ipv4_addr = flow->nw_src ^ flow->nw_dst; + fields.ip_proto = flow->nw_proto; + if (fields.ip_proto == IPPROTO_TCP) { + fields.tp_port = flow->tp_src ^ flow->tp_dst; + } + } else if (fields.eth_type == htons(ETH_TYPE_IPV6)) { + const uint8_t *a = &flow->ipv6_src.s6_addr[0]; + const uint8_t *b = &flow->ipv6_dst.s6_addr[0]; + uint8_t *ipv6_addr = &fields.ipv6_addr.s6_addr[0]; + + for (i=0; i<16; i++) { + ipv6_addr[i] = a[i] ^ b[i]; + } + fields.ip_proto = flow->nw_proto; + if (fields.ip_proto == IPPROTO_TCP) { + fields.tp_port = flow->tp_src ^ flow->tp_dst; + } + } + return hash_bytes(&fields, sizeof fields, basis); +} + +/* Hashes the portions of 'flow' designated by 'fields'. */ +uint32_t +flow_hash_fields(const struct flow *flow, enum nx_hash_fields fields, + uint16_t basis) +{ + switch (fields) { + + case NX_HASH_FIELDS_ETH_SRC: + return hash_bytes(flow->dl_src, sizeof flow->dl_src, basis); + + case NX_HASH_FIELDS_SYMMETRIC_L4: + return flow_hash_symmetric_l4(flow, basis); + } + + NOT_REACHED(); +} + +/* Returns a string representation of 'fields'. */ +const char * +flow_hash_fields_to_str(enum nx_hash_fields fields) +{ + switch (fields) { + case NX_HASH_FIELDS_ETH_SRC: return "eth_src"; + case NX_HASH_FIELDS_SYMMETRIC_L4: return "symmetric_l4"; + default: return ""; + } +} + +/* Returns true if the value of 'fields' is supported. Otherwise false. */ +bool +flow_hash_fields_valid(enum nx_hash_fields fields) +{ + return fields == NX_HASH_FIELDS_ETH_SRC + || fields == NX_HASH_FIELDS_SYMMETRIC_L4; +} + +/* Sets the VLAN VID that 'flow' matches to 'vid', which is interpreted as an + * OpenFlow 1.0 "dl_vlan" value: + * + * - If it is in the range 0...4095, 'flow->vlan_tci' is set to match + * that VLAN. Any existing PCP match is unchanged (it becomes 0 if + * 'flow' previously matched packets without a VLAN header). + * + * - If it is OFP_VLAN_NONE, 'flow->vlan_tci' is set to match a packet + * without a VLAN tag. + * + * - Other values of 'vid' should not be used. */ +void +flow_set_vlan_vid(struct flow *flow, ovs_be16 vid) +{ + if (vid == htons(OFP10_VLAN_NONE)) { + flow->vlan_tci = htons(0); + } else { + vid &= htons(VLAN_VID_MASK); + flow->vlan_tci &= ~htons(VLAN_VID_MASK); + flow->vlan_tci |= htons(VLAN_CFI) | vid; + } +} + +/* Sets the VLAN PCP that 'flow' matches to 'pcp', which should be in the + * range 0...7. + * + * This function has no effect on the VLAN ID that 'flow' matches. + * + * After calling this function, 'flow' will not match packets without a VLAN + * header. */ +void +flow_set_vlan_pcp(struct flow *flow, uint8_t pcp) +{ + pcp &= 0x07; + flow->vlan_tci &= ~htons(VLAN_PCP_MASK); + flow->vlan_tci |= htons((pcp << VLAN_PCP_SHIFT) | VLAN_CFI); +} + +/* Puts into 'b' a packet that flow_extract() would parse as having the given + * 'flow'. + * + * (This is useful only for testing, obviously, and the packet isn't really + * valid. It hasn't got any checksums filled in, for one, and lots of fields + * are just zeroed.) */ +void +flow_compose(struct ofpbuf *b, const struct flow *flow) +{ + eth_compose(b, flow->dl_dst, flow->dl_src, ntohs(flow->dl_type), 0); + if (flow->dl_type == htons(FLOW_DL_TYPE_NONE)) { + struct eth_header *eth = b->l2; + eth->eth_type = htons(b->size); + return; + } + + if (flow->vlan_tci & htons(VLAN_CFI)) { + eth_push_vlan(b, flow->vlan_tci); + } + + if (flow->dl_type == htons(ETH_TYPE_IP)) { + struct ip_header *ip; + + b->l3 = ip = ofpbuf_put_zeros(b, sizeof *ip); + ip->ip_ihl_ver = IP_IHL_VER(5, 4); + ip->ip_tos = flow->nw_tos; + ip->ip_proto = flow->nw_proto; + ip->ip_src = flow->nw_src; + ip->ip_dst = flow->nw_dst; + + if (flow->nw_frag & FLOW_NW_FRAG_ANY) { + ip->ip_frag_off |= htons(IP_MORE_FRAGMENTS); + if (flow->nw_frag & FLOW_NW_FRAG_LATER) { + ip->ip_frag_off |= htons(100); + } + } + if (!(flow->nw_frag & FLOW_NW_FRAG_ANY) + || !(flow->nw_frag & FLOW_NW_FRAG_LATER)) { + if (flow->nw_proto == IPPROTO_TCP) { + struct tcp_header *tcp; + + b->l4 = tcp = ofpbuf_put_zeros(b, sizeof *tcp); + tcp->tcp_src = flow->tp_src; + tcp->tcp_dst = flow->tp_dst; + tcp->tcp_ctl = TCP_CTL(0, 5); + } else if (flow->nw_proto == IPPROTO_UDP) { + struct udp_header *udp; + + b->l4 = udp = ofpbuf_put_zeros(b, sizeof *udp); + udp->udp_src = flow->tp_src; + udp->udp_dst = flow->tp_dst; + } else if (flow->nw_proto == IPPROTO_ICMP) { + struct icmp_header *icmp; + + b->l4 = icmp = ofpbuf_put_zeros(b, sizeof *icmp); + icmp->icmp_type = ntohs(flow->tp_src); + icmp->icmp_code = ntohs(flow->tp_dst); + } + } + + ip->ip_tot_len = htons((uint8_t *) b->data + b->size + - (uint8_t *) b->l3); + } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) { + /* XXX */ + } else if (flow->dl_type == htons(ETH_TYPE_ARP)) { + struct arp_eth_header *arp; + + b->l3 = arp = ofpbuf_put_zeros(b, sizeof *arp); + arp->ar_hrd = htons(1); + arp->ar_pro = htons(ETH_TYPE_IP); + arp->ar_hln = ETH_ADDR_LEN; + arp->ar_pln = 4; + arp->ar_op = htons(flow->nw_proto); + + if (flow->nw_proto == ARP_OP_REQUEST || + flow->nw_proto == ARP_OP_REPLY) { + arp->ar_spa = flow->nw_src; + arp->ar_tpa = flow->nw_dst; + memcpy(arp->ar_sha, flow->arp_sha, ETH_ADDR_LEN); + memcpy(arp->ar_tha, flow->arp_tha, ETH_ADDR_LEN); + } + } +}