X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fflow.c;h=41f13b88c46f78299bc94d035f9d78cfb7b3a30c;hb=d31f1109f10e5ffb9bf266306b913ebf23781666;hp=1801d4dede334f4f9c6bf084ae718ad6bc1855a8;hpb=a14bc59fb8f27db193d74662dc9c5cb8237177ef;p=sliver-openvswitch.git diff --git a/lib/flow.c b/lib/flow.c index 1801d4ded..41f13b88c 100644 --- a/lib/flow.c +++ b/lib/flow.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2008, 2009 Nicira Networks. + * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -16,20 +16,34 @@ #include #include #include "flow.h" +#include #include #include +#include +#include #include #include +#include "byte-order.h" #include "coverage.h" +#include "dpif.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) +{ + return ofpbuf_try_pull(packet, ARP_ETH_HEADER_LEN); +} static struct ip_header * pull_ip(struct ofpbuf *packet) @@ -45,7 +59,7 @@ 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; @@ -58,32 +72,182 @@ 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 void +parse_vlan(struct ofpbuf *b, struct flow *flow) +{ + 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 struct vlan_header * -pull_vlan(struct ofpbuf *packet) +static int +parse_ipv6(struct ofpbuf *packet, struct flow *flow) { - return ofpbuf_try_pull(packet, VLAN_HEADER_LEN); + struct ip6_hdr *nh; + int nh_len = sizeof(struct ip6_hdr); + int payload_len; + ovs_be32 tc_flow; + int nexthdr; + + if (packet->size < sizeof *nh) { + return -EINVAL; + } + + nh = packet->data; + nexthdr = nh->ip6_nxt; + payload_len = ntohs(nh->ip6_plen); + + 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) >> 4) & IP_DSCP_MASK; + flow->nw_proto = IPPROTO_NONE; + + /* We don't process jumbograms. */ + if (!payload_len) { + return -EINVAL; + } + + if (packet->size < sizeof *nh + payload_len) { + return -EINVAL; + } + + 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. */ + if (packet->size < nh_len + 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. */ + struct ip6_ext *ext_hdr; + + ext_hdr = (struct ip6_ext *)((char *)packet->data + nh_len); + nexthdr = ext_hdr->ip6e_nxt; + nh_len += (ext_hdr->ip6e_len + 1) * 8; + } 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. */ + struct ip6_ext *ext_hdr; + + ext_hdr = (struct ip6_ext *)((char *)packet->data + nh_len); + nexthdr = ext_hdr->ip6e_nxt; + nh_len += (ext_hdr->ip6e_len + 2) * 4; + } else if (nexthdr == IPPROTO_FRAGMENT) { + struct ip6_frag *frag_hdr; + + frag_hdr = (struct ip6_frag *)((char *)packet->data + nh_len); + + nexthdr = frag_hdr->ip6f_nxt; + nh_len += sizeof *frag_hdr; + + /* We only process the first fragment. */ + if ((frag_hdr->ip6f_offlg & IP6F_OFF_MASK) != htons(0)) { + nexthdr = IPPROTO_FRAGMENT; + break; + } + } + } + + /* The payload length claims to be smaller than the size of the + * headers we've already processed. */ + if (payload_len < nh_len - sizeof *nh) { + return -EINVAL; + } + + flow->nw_proto = nexthdr; + return nh_len; } -/* 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_be64 tun_id, uint16_t in_port, + struct flow *flow) { struct ofpbuf b = *packet; struct eth_header *eth; @@ -92,7 +256,7 @@ 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; packet->l2 = b.data; @@ -100,93 +264,115 @@ flow_extract(struct ofpbuf *packet, uint16_t in_port, flow_t *flow) 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); + if (b.size < sizeof *eth) { + return 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, 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) { + flow->nw_src = get_unaligned_be32(&nh->ip_src); + flow->nw_dst = get_unaligned_be32(&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 == IPPROTO_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 == IPPROTO_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 == IPPROTO_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 { - flow->dl_type = htons(OFP_DL_TYPE_NOT_ETH_TYPE); - ofpbuf_pull(&b, sizeof(struct llc_header)); + retval = 1; } } + } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) { + int nh_len; + const struct ip6_hdr *nh; - /* 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); - } + nh_len = parse_ipv6(&b, flow); + if (nh_len < 0) { + return 0; } - 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; - } - } - } else { - retval = 1; + + nh = ofpbuf_pull(&b, nh_len); + if (nh) { + packet->l4 = b.data; + if (flow->nw_proto == IPPROTO_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 == IPPROTO_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 == IPPROTO_ICMPV6) { + const struct icmp6_hdr *icmp = pull_icmpv6(&b); + if (icmp) { + flow->icmp_type = htons(icmp->icmp6_type); + flow->icmp_code = htons(icmp->icmp6_code); + packet->l7 = b.data; + } + } + } + } 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; + memcpy(flow->arp_sha, arp->ar_sha, ETH_ADDR_LEN); + memcpy(flow->arp_tha, arp->ar_tha, ETH_ADDR_LEN); } } } + return retval; } @@ -194,15 +380,13 @@ 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, - struct odp_flow_stats *stats) +flow_extract_stats(const struct flow *flow, struct ofpbuf *packet, + struct dpif_flow_stats *stats) { - memset(stats, '\0', sizeof(*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) { + if ((flow->nw_proto == IPPROTO_TCP) && packet->l7) { struct tcp_header *tcp = packet->l4; stats->tcp_flags = TCP_FLAGS(tcp->tcp_ctl); } @@ -212,69 +396,330 @@ flow_extract_stats(const flow_t *flow, struct ofpbuf *packet, stats->n_packets = 1; } -void -flow_to_match(const flow_t *flow, uint32_t wildcards, struct ofp_match *match) +char * +flow_to_string(const struct flow *flow) { - match->wildcards = htonl(wildcards); - match->in_port = htons(flow->in_port == ODPP_LOCAL ? OFPP_LOCAL - : flow->in_port); - match->dl_vlan = flow->dl_vlan; - 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_proto = flow->nw_proto; - match->tp_src = flow->tp_src; - match->tp_dst = flow->tp_dst; - match->pad = 0; + struct ds ds = DS_EMPTY_INITIALIZER; + flow_format(&ds, flow); + return ds_cstr(&ds); } void -flow_from_match(flow_t *flow, uint32_t *wildcards, - const struct ofp_match *match) +flow_format(struct ds *ds, const struct flow *flow) { - if (wildcards) { - *wildcards = ntohl(match->wildcards); + ds_put_format(ds, "tunnel%#"PRIx64":in_port%04"PRIx16":tci(", + flow->tun_id, flow->in_port); + 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, " proto%"PRIu8" tos%"PRIu8" ipv6", + flow->nw_proto, flow->nw_tos); + print_ipv6_addr(ds, &flow->ipv6_src); + ds_put_cstr(ds, "->"); + print_ipv6_addr(ds, &flow->ipv6_dst); + + } else { + ds_put_format(ds, " proto%"PRIu8 + " tos%"PRIu8 + " ip"IP_FMT"->"IP_FMT, + flow->nw_proto, + flow->nw_tos, + IP_ARGS(&flow->nw_src), + IP_ARGS(&flow->nw_dst)); + } + 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)); } - 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_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_proto = match->nw_proto; - flow->reserved = 0; } -char * -flow_to_string(const flow_t *flow) +void +flow_print(FILE *stream, const struct flow *flow) { - struct ds ds = DS_EMPTY_INITIALIZER; - flow_format(&ds, flow); - return ds_cstr(&ds); + 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_format(struct ds *ds, const flow_t *flow) +flow_wildcards_init_catchall(struct flow_wildcards *wc) { - ds_put_format(ds, "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)); + 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; + memset(wc->reg_masks, 0, sizeof wc->reg_masks); + wc->vlan_tci_mask = htons(0); + wc->zero = 0; } +/* Initializes 'wc' as an exact-match set of wildcards; that is, 'wc' does not + * wildcard any bits or fields. */ void -flow_print(FILE *stream, const flow_t *flow) +flow_wildcards_init_exact(struct flow_wildcards *wc) { - char *s = flow_to_string(flow); - fputs(s, stream); - free(s); + 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; + memset(wc->reg_masks, 0xff, sizeof wc->reg_masks); + wc->vlan_tci_mask = htons(UINT16_MAX); + wc->zero = 0; +} + +/* 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; + + 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->vlan_tci_mask != htons(UINT16_MAX) + || !ipv6_mask_is_exact(&wc->ipv6_src_mask) + || !ipv6_mask_is_exact(&wc->ipv6_dst_mask)) { + return false; + } + + for (i = 0; i < FLOW_N_REGS; i++) { + if (wc->reg_masks[i] != htonl(UINT32_MAX)) { + 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; + + 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); + for (i = 0; i < FLOW_N_REGS; i++) { + dst->reg_masks[i] = src1->reg_masks[i] & src2->reg_masks[i]; + } + dst->vlan_tci_mask = src1->vlan_tci_mask & src2->vlan_tci_mask; +} + +/* Returns a hash of the wildcards in 'wc'. */ +uint32_t +flow_wildcards_hash(const struct flow_wildcards *wc) +{ + /* 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 == 56 + FLOW_N_REGS * 4); + return hash_bytes(wc, sizeof *wc, 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 + || 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 + || !ipv6_addr_equals(&a->ipv6_src_mask, &b->ipv6_src_mask) + || !ipv6_addr_equals(&a->ipv6_dst_mask, &b->ipv6_dst_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; + struct in6_addr ipv6_masked; + + for (i = 0; i < FLOW_N_REGS; i++) { + if ((a->reg_masks[i] & b->reg_masks[i]) != b->reg_masks[i]) { + 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; + } + + 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->vlan_tci_mask & b->vlan_tci_mask) != b->vlan_tci_mask); +} + +static bool +set_nw_mask(ovs_be32 *maskp, ovs_be32 mask) +{ + if (ip_is_cidr(mask)) { + *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->nw_src_mask, mask); +} + +/* 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->nw_dst_mask, mask); +} + +static bool +set_ipv6_mask(struct in6_addr *maskp, const struct in6_addr *mask) +{ + if (ipv6_is_cidr(mask)) { + *maskp = *mask; + return true; + } else { + return false; + } +} + +/* Sets the IPv6 source wildcard mask to CIDR 'mask' (consisting of N + * high-order 1-bit and 128-N low-order 0-bits). Returns true if successful, + * false if 'mask' is not a CIDR mask. */ +bool +flow_wildcards_set_ipv6_src_mask(struct flow_wildcards *wc, + const struct in6_addr *mask) +{ + return set_ipv6_mask(&wc->ipv6_src_mask, mask); +} + +/* Sets the IPv6 destination wildcard mask to CIDR 'mask' (consisting of + * N high-order 1-bit and 128-N low-order 0-bits). Returns true if + * successful, false if 'mask' is not a CIDR mask. */ +bool +flow_wildcards_set_ipv6_dst_mask(struct flow_wildcards *wc, + const struct in6_addr *mask) +{ + return set_ipv6_mask(&wc->ipv6_dst_mask, 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_addr; + 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; + 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.ip_proto == IPPROTO_UDP) { + fields.tp_addr = 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.ip_proto == IPPROTO_UDP) { + fields.tp_addr = flow->tp_src ^ flow->tp_dst; + } + } + return hash_bytes(&fields, sizeof fields, basis); }