X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=ofproto%2Fnetflow.c;h=e9382afe9be707b2feccd6d0d2d84992e29265be;hb=HEAD;hp=34d571f08c481282266ed8e9019d1c47dde13ccc;hpb=c69ee87c10818267f991236201150b1fa51ae519;p=sliver-openvswitch.git diff --git a/ofproto/netflow.c b/ofproto/netflow.c index 34d571f08..e9382afe9 100644 --- a/ofproto/netflow.c +++ b/ofproto/netflow.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2008, 2009 Nicira Networks. + * Copyright (c) 2008, 2009, 2010, 2011, 2013, 2014 Nicira, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -20,186 +20,354 @@ #include #include #include +#include "byte-order.h" #include "collectors.h" +#include "dpif.h" #include "flow.h" -#include "netflow.h" +#include "lib/netflow.h" #include "ofpbuf.h" #include "ofproto.h" +#include "ofproto/netflow.h" #include "packets.h" +#include "poll-loop.h" #include "socket-util.h" -#include "svec.h" #include "timeval.h" #include "util.h" -#include "xtoxll.h" - -#define THIS_MODULE VLM_netflow #include "vlog.h" -#define NETFLOW_V5_VERSION 5 - -/* Every NetFlow v5 message contains the header that follows. This is - * followed by up to thirty records that describe a terminating flow. - * We only send a single record per NetFlow message. - */ -struct netflow_v5_header { - uint16_t version; /* NetFlow version is 5. */ - uint16_t count; /* Number of records in this message. */ - uint32_t sysuptime; /* System uptime in milliseconds. */ - uint32_t unix_secs; /* Number of seconds since Unix epoch. */ - uint32_t unix_nsecs; /* Number of residual nanoseconds - after epoch seconds. */ - uint32_t flow_seq; /* Number of flows since sending - messages began. */ - uint8_t engine_type; /* Engine type. */ - uint8_t engine_id; /* Engine id. */ - uint16_t sampling_interval; /* Set to zero. */ -}; -BUILD_ASSERT_DECL(sizeof(struct netflow_v5_header) == 24); - -/* A NetFlow v5 description of a terminating flow. It is preceded by a - * NetFlow v5 header. - */ -struct netflow_v5_record { - uint32_t src_addr; /* Source IP address. */ - uint32_t dst_addr; /* Destination IP address. */ - uint32_t nexthop; /* IP address of next hop. Set to 0. */ - uint16_t input; /* Input interface index. */ - uint16_t output; /* Output interface index. */ - uint32_t packet_count; /* Number of packets. */ - uint32_t byte_count; /* Number of bytes. */ - uint32_t init_time; /* Value of sysuptime on first packet. */ - uint32_t used_time; /* Value of sysuptime on last packet. */ - - /* The 'src_port' and 'dst_port' identify the source and destination - * port, respectively, for TCP and UDP. For ICMP, the high-order - * byte identifies the type and low-order byte identifies the code - * in the 'dst_port' field. */ - uint16_t src_port; - uint16_t dst_port; - - uint8_t pad1; - uint8_t tcp_flags; /* Union of seen TCP flags. */ - uint8_t ip_proto; /* IP protocol. */ - uint8_t ip_tos; /* IP TOS value. */ - uint16_t src_as; /* Source AS ID. Set to 0. */ - uint16_t dst_as; /* Destination AS ID. Set to 0. */ - uint8_t src_mask; /* Source mask bits. Set to 0. */ - uint8_t dst_mask; /* Destination mask bits. Set to 0. */ - uint8_t pad[2]; -}; -BUILD_ASSERT_DECL(sizeof(struct netflow_v5_record) == 48); +VLOG_DEFINE_THIS_MODULE(netflow); struct netflow { uint8_t engine_type; /* Value of engine_type to use. */ uint8_t engine_id; /* Value of engine_id to use. */ long long int boot_time; /* Time when netflow_create() was called. */ struct collectors *collectors; /* NetFlow collectors. */ - bool add_id_to_iface; /* Put the 7 least signficiant bits of - * 'engine_id' into the most signficant + bool add_id_to_iface; /* Put the 7 least significiant bits of + * 'engine_id' into the most significant * bits of the interface fields. */ uint32_t netflow_cnt; /* Flow sequence number for NetFlow. */ struct ofpbuf packet; /* NetFlow packet being accumulated. */ long long int active_timeout; /* Timeout for flows that are still active. */ + long long int next_timeout; /* Next scheduled active timeout. */ long long int reconfig_time; /* When we reconfigured the timeouts. */ + + struct hmap flows; /* Contains 'netflow_flows'. */ + + struct ovs_refcount ref_cnt; }; +struct netflow_flow { + struct hmap_node hmap_node; + + long long int last_expired; /* Time this flow last timed out. */ + long long int created; /* Time flow was created since time out. */ + + ofp_port_t output_iface; /* Output interface index. */ + uint16_t tcp_flags; /* Bitwise-OR of all TCP flags seen. */ + + ofp_port_t in_port; /* Input port. */ + ovs_be32 nw_src; /* IPv4 source address. */ + ovs_be32 nw_dst; /* IPv4 destination address. */ + uint8_t nw_tos; /* IP ToS (including DSCP and ECN). */ + uint8_t nw_proto; /* IP protocol. */ + ovs_be16 tp_src; /* TCP/UDP/SCTP source port. */ + ovs_be16 tp_dst; /* TCP/UDP/SCTP destination port. */ + + uint64_t packet_count; /* Packets from subrules. */ + uint64_t byte_count; /* Bytes from subrules. */ + long long int used; /* Last-used time (0 if never used). */ +}; + +static struct ovs_mutex mutex = OVS_MUTEX_INITIALIZER; +static atomic_uint netflow_count = ATOMIC_VAR_INIT(0); + +static struct netflow_flow *netflow_flow_lookup(const struct netflow *, + const struct flow *) + OVS_REQUIRES(mutex); +static uint32_t netflow_flow_hash(const struct flow *); +static void netflow_expire__(struct netflow *, struct netflow_flow *) + OVS_REQUIRES(mutex); +static void netflow_run__(struct netflow *) OVS_REQUIRES(mutex); + void -netflow_expire(struct netflow *nf, struct netflow_flow *nf_flow, - struct ofexpired *expired) +netflow_mask_wc(struct flow *flow, struct flow_wildcards *wc) +{ + if (flow->dl_type != htons(ETH_TYPE_IP)) { + return; + } + memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto); + memset(&wc->masks.nw_src, 0xff, sizeof wc->masks.nw_src); + memset(&wc->masks.nw_dst, 0xff, sizeof wc->masks.nw_dst); + flow_unwildcard_tp_ports(flow, wc); + wc->masks.nw_tos |= IP_DSCP_MASK; +} + +static void +gen_netflow_rec(struct netflow *nf, struct netflow_flow *nf_flow, + uint32_t packet_count, uint32_t byte_count) + OVS_REQUIRES(mutex) { struct netflow_v5_header *nf_hdr; struct netflow_v5_record *nf_rec; - struct timeval now; - - nf_flow->last_expired += nf->active_timeout; - /* NetFlow only reports on IP packets and we should only report flows - * that actually have traffic. */ - if (expired->flow.dl_type != htons(ETH_TYPE_IP) || - expired->packet_count - nf_flow->packet_count_off == 0) { - return; - } + if (!ofpbuf_size(&nf->packet)) { + struct timespec now; - time_timeval(&now); + time_wall_timespec(&now); - if (!nf->packet.size) { nf_hdr = ofpbuf_put_zeros(&nf->packet, sizeof *nf_hdr); nf_hdr->version = htons(NETFLOW_V5_VERSION); nf_hdr->count = htons(0); nf_hdr->sysuptime = htonl(time_msec() - nf->boot_time); nf_hdr->unix_secs = htonl(now.tv_sec); - nf_hdr->unix_nsecs = htonl(now.tv_usec * 1000); + nf_hdr->unix_nsecs = htonl(now.tv_nsec); nf_hdr->flow_seq = htonl(nf->netflow_cnt++); nf_hdr->engine_type = nf->engine_type; nf_hdr->engine_id = nf->engine_id; nf_hdr->sampling_interval = htons(0); } - nf_hdr = nf->packet.data; + nf_hdr = ofpbuf_data(&nf->packet); nf_hdr->count = htons(ntohs(nf_hdr->count) + 1); nf_rec = ofpbuf_put_zeros(&nf->packet, sizeof *nf_rec); - nf_rec->src_addr = expired->flow.nw_src; - nf_rec->dst_addr = expired->flow.nw_dst; - nf_rec->nexthop = htons(0); + nf_rec->src_addr = nf_flow->nw_src; + nf_rec->dst_addr = nf_flow->nw_dst; + nf_rec->nexthop = htonl(0); if (nf->add_id_to_iface) { uint16_t iface = (nf->engine_id & 0x7f) << 9; - nf_rec->input = htons(iface | (expired->flow.in_port & 0x1ff)); - nf_rec->output = htons(iface | (nf_flow->output_iface & 0x1ff)); + nf_rec->input = htons(iface | (ofp_to_u16(nf_flow->in_port) & 0x1ff)); + nf_rec->output = htons(iface + | (ofp_to_u16(nf_flow->output_iface) & 0x1ff)); } else { - nf_rec->input = htons(expired->flow.in_port); - nf_rec->output = htons(nf_flow->output_iface); + nf_rec->input = htons(ofp_to_u16(nf_flow->in_port)); + nf_rec->output = htons(ofp_to_u16(nf_flow->output_iface)); } - nf_rec->packet_count = htonl(MIN(expired->packet_count - - nf_flow->packet_count_off, UINT32_MAX)); - nf_rec->byte_count = htonl(MIN(expired->byte_count - - nf_flow->byte_count_off, UINT32_MAX)); + nf_rec->packet_count = htonl(packet_count); + nf_rec->byte_count = htonl(byte_count); nf_rec->init_time = htonl(nf_flow->created - nf->boot_time); - nf_rec->used_time = htonl(MAX(nf_flow->created, expired->used) + nf_rec->used_time = htonl(MAX(nf_flow->created, nf_flow->used) - nf->boot_time); - if (expired->flow.nw_proto == IP_TYPE_ICMP) { + if (nf_flow->nw_proto == IPPROTO_ICMP) { /* In NetFlow, the ICMP type and code are concatenated and * placed in the 'dst_port' field. */ - uint8_t type = ntohs(expired->flow.tp_src); - uint8_t code = ntohs(expired->flow.tp_dst); + uint8_t type = ntohs(nf_flow->tp_src); + uint8_t code = ntohs(nf_flow->tp_dst); nf_rec->src_port = htons(0); nf_rec->dst_port = htons((type << 8) | code); } else { - nf_rec->src_port = expired->flow.tp_src; - nf_rec->dst_port = expired->flow.tp_dst; + nf_rec->src_port = nf_flow->tp_src; + nf_rec->dst_port = nf_flow->tp_dst; + } + nf_rec->tcp_flags = (uint8_t) nf_flow->tcp_flags; + nf_rec->ip_proto = nf_flow->nw_proto; + nf_rec->ip_tos = nf_flow->nw_tos & IP_DSCP_MASK; + + /* NetFlow messages are limited to 30 records. */ + if (ntohs(nf_hdr->count) >= 30) { + netflow_run__(nf); + } +} + +void +netflow_flow_update(struct netflow *nf, const struct flow *flow, + ofp_port_t output_iface, + const struct dpif_flow_stats *stats) + OVS_EXCLUDED(mutex) +{ + struct netflow_flow *nf_flow; + long long int used; + + /* NetFlow only reports on IP packets. */ + if (flow->dl_type != htons(ETH_TYPE_IP)) { + return; + } + + ovs_mutex_lock(&mutex); + nf_flow = netflow_flow_lookup(nf, flow); + if (!nf_flow) { + nf_flow = xzalloc(sizeof *nf_flow); + nf_flow->in_port = flow->in_port.ofp_port; + nf_flow->nw_src = flow->nw_src; + nf_flow->nw_dst = flow->nw_dst; + nf_flow->nw_tos = flow->nw_tos; + nf_flow->nw_proto = flow->nw_proto; + nf_flow->tp_src = flow->tp_src; + nf_flow->tp_dst = flow->tp_dst; + nf_flow->created = stats->used; + nf_flow->output_iface = output_iface; + hmap_insert(&nf->flows, &nf_flow->hmap_node, netflow_flow_hash(flow)); + } + + if (nf_flow->output_iface != output_iface) { + netflow_expire__(nf, nf_flow); + nf_flow->created = stats->used; + nf_flow->output_iface = output_iface; + } + + nf_flow->packet_count += stats->n_packets; + nf_flow->byte_count += stats->n_bytes; + nf_flow->tcp_flags |= stats->tcp_flags; + + used = MAX(nf_flow->used, stats->used); + if (nf_flow->used != used) { + nf_flow->used = used; + if (!nf->active_timeout || !nf_flow->last_expired + || nf->reconfig_time > nf_flow->last_expired) { + /* Keep the time updated to prevent a flood of expiration in + * the future. */ + nf_flow->last_expired = time_msec(); + } + } + + ovs_mutex_unlock(&mutex); +} + +static void +netflow_expire__(struct netflow *nf, struct netflow_flow *nf_flow) + OVS_REQUIRES(mutex) +{ + uint64_t pkts, bytes; + + pkts = nf_flow->packet_count; + bytes = nf_flow->byte_count; + + nf_flow->last_expired += nf->active_timeout; + + if (pkts == 0) { + return; + } + + if ((bytes >> 32) <= 175) { + /* NetFlow v5 records are limited to 32-bit counters. If we've wrapped + * a counter, send as multiple records so we don't lose track of any + * traffic. We try to evenly distribute the packet and byte counters, + * so that the bytes-per-packet lengths don't look wonky across the + * records. */ + while (bytes) { + int n_recs = (bytes + UINT32_MAX - 1) / UINT32_MAX; + uint32_t pkt_count = pkts / n_recs; + uint32_t byte_count = bytes / n_recs; + + gen_netflow_rec(nf, nf_flow, pkt_count, byte_count); + + pkts -= pkt_count; + bytes -= byte_count; + } + } else { + /* In 600 seconds, a 10GbE link can theoretically transmit 75 * 10**10 + * == 175 * 2**32 bytes. The byte counter is bigger than that, so it's + * probably a bug--for example, the netdev code uses UINT64_MAX to + * report "unknown value", and perhaps that has leaked through to here. + * + * We wouldn't want to hit the loop above in this case, because it + * would try to send up to UINT32_MAX netflow records, which would take + * a long time. + */ + static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1); + + VLOG_WARN_RL(&rl, "impossible byte counter %"PRIu64, bytes); } - nf_rec->tcp_flags = nf_flow->tcp_flags; - nf_rec->ip_proto = expired->flow.nw_proto; - nf_rec->ip_tos = nf_flow->ip_tos; /* Update flow tracking data. */ - nf_flow->created = 0; - nf_flow->packet_count_off = expired->packet_count; - nf_flow->byte_count_off = expired->byte_count; + nf_flow->packet_count = 0; + nf_flow->byte_count = 0; nf_flow->tcp_flags = 0; +} - /* NetFlow messages are limited to 30 records. */ - if (ntohs(nf_hdr->count) >= 30) { - netflow_run(nf); +void +netflow_expire(struct netflow *nf, struct flow *flow) OVS_EXCLUDED(mutex) +{ + struct netflow_flow *nf_flow; + + ovs_mutex_lock(&mutex); + nf_flow = netflow_flow_lookup(nf, flow); + if (nf_flow) { + netflow_expire__(nf, nf_flow); + } + ovs_mutex_unlock(&mutex); +} + +void +netflow_flow_clear(struct netflow *nf, struct flow *flow) OVS_EXCLUDED(mutex) +{ + struct netflow_flow *nf_flow; + + ovs_mutex_lock(&mutex); + nf_flow = netflow_flow_lookup(nf, flow); + if (nf_flow) { + ovs_assert(!nf_flow->packet_count); + ovs_assert(!nf_flow->byte_count); + hmap_remove(&nf->flows, &nf_flow->hmap_node); + free(nf_flow); + } + ovs_mutex_unlock(&mutex); +} + +/* Returns true if it's time to send out a round of NetFlow active timeouts, + * false otherwise. */ +static void +netflow_run__(struct netflow *nf) OVS_REQUIRES(mutex) +{ + long long int now = time_msec(); + struct netflow_flow *nf_flow, *next; + + if (ofpbuf_size(&nf->packet)) { + collectors_send(nf->collectors, ofpbuf_data(&nf->packet), ofpbuf_size(&nf->packet)); + ofpbuf_set_size(&nf->packet, 0); + } + + if (!nf->active_timeout || now < nf->next_timeout) { + return; + } + + nf->next_timeout = now + 1000; + + HMAP_FOR_EACH_SAFE (nf_flow, next, hmap_node, &nf->flows) { + if (now > nf_flow->last_expired + nf->active_timeout) { + bool idle = nf_flow->used < nf_flow->last_expired; + netflow_expire__(nf, nf_flow); + + if (idle) { + /* If the netflow_flow hasn't been used in a while, it's + * possible the upper layer lost track of it. */ + hmap_remove(&nf->flows, &nf_flow->hmap_node); + free(nf_flow); + } + } } } void netflow_run(struct netflow *nf) { - if (nf->packet.size) { - collectors_send(nf->collectors, nf->packet.data, nf->packet.size); - nf->packet.size = 0; + ovs_mutex_lock(&mutex); + netflow_run__(nf); + ovs_mutex_unlock(&mutex); +} + +void +netflow_wait(struct netflow *nf) OVS_EXCLUDED(mutex) +{ + ovs_mutex_lock(&mutex); + if (nf->active_timeout) { + poll_timer_wait_until(nf->next_timeout); } + if (ofpbuf_size(&nf->packet)) { + poll_immediate_wake(); + } + ovs_mutex_unlock(&mutex); } int netflow_set_options(struct netflow *nf, const struct netflow_options *nf_options) + OVS_EXCLUDED(mutex) { int error = 0; long long int old_timeout; + ovs_mutex_lock(&mutex); nf->engine_type = nf_options->engine_type; nf->engine_id = nf_options->engine_id; nf->add_id_to_iface = nf_options->add_id_to_iface; @@ -216,7 +384,9 @@ netflow_set_options(struct netflow *nf, nf->active_timeout *= 1000; if (old_timeout != nf->active_timeout) { nf->reconfig_time = time_msec(); + nf->next_timeout = time_msec(); } + ovs_mutex_unlock(&mutex); return error; } @@ -224,66 +394,91 @@ netflow_set_options(struct netflow *nf, struct netflow * netflow_create(void) { - struct netflow *nf = xmalloc(sizeof *nf); + struct netflow *nf = xzalloc(sizeof *nf); + int junk; + nf->engine_type = 0; nf->engine_id = 0; nf->boot_time = time_msec(); nf->collectors = NULL; nf->add_id_to_iface = false; nf->netflow_cnt = 0; + hmap_init(&nf->flows); + ovs_refcount_init(&nf->ref_cnt); ofpbuf_init(&nf->packet, 1500); + atomic_add(&netflow_count, 1, &junk); return nf; } -void -netflow_destroy(struct netflow *nf) +struct netflow * +netflow_ref(const struct netflow *nf_) { + struct netflow *nf = CONST_CAST(struct netflow *, nf_); if (nf) { - ofpbuf_uninit(&nf->packet); - collectors_destroy(nf->collectors); - free(nf); + ovs_refcount_ref(&nf->ref_cnt); } + return nf; } void -netflow_flow_clear(struct netflow_flow *nf_flow) +netflow_unref(struct netflow *nf) { - uint16_t output_iface = nf_flow->output_iface; + if (nf && ovs_refcount_unref(&nf->ref_cnt) == 1) { + int orig; - memset(nf_flow, 0, sizeof *nf_flow); - nf_flow->output_iface = output_iface; + atomic_sub(&netflow_count, 1, &orig); + collectors_destroy(nf->collectors); + ofpbuf_uninit(&nf->packet); + free(nf); + } } -void -netflow_flow_update_time(struct netflow *nf, struct netflow_flow *nf_flow, - long long int used) +/* Returns true if there exist any netflow objects, false otherwise. */ +bool +netflow_exists(void) { - if (!nf_flow->created) { - nf_flow->created = used; - } + int n; - if (!nf || !nf->active_timeout || !nf_flow->last_expired || - nf->reconfig_time > nf_flow->last_expired) { - /* Keep the time updated to prevent a flood of expiration in - * the future. */ - nf_flow->last_expired = time_msec(); - } + atomic_read(&netflow_count, &n); + return n > 0; } + +/* Helpers. */ -void -netflow_flow_update_flags(struct netflow_flow *nf_flow, uint8_t ip_tos, - uint8_t tcp_flags) +static struct netflow_flow * +netflow_flow_lookup(const struct netflow *nf, const struct flow *flow) + OVS_REQUIRES(mutex) { - nf_flow->ip_tos = ip_tos; - nf_flow->tcp_flags |= tcp_flags; + struct netflow_flow *nf_flow; + + HMAP_FOR_EACH_WITH_HASH (nf_flow, hmap_node, netflow_flow_hash(flow), + &nf->flows) { + if (flow->in_port.ofp_port == nf_flow->in_port + && flow->nw_src == nf_flow->nw_src + && flow->nw_dst == nf_flow->nw_dst + && flow->nw_tos == nf_flow->nw_tos + && flow->nw_proto == nf_flow->nw_proto + && flow->tp_src == nf_flow->tp_src + && flow->tp_dst == nf_flow->tp_dst) { + return nf_flow; + } + } + + return NULL; } -bool -netflow_active_timeout_expired(struct netflow *nf, struct netflow_flow *nf_flow) +static uint32_t +netflow_flow_hash(const struct flow *flow) { - if (nf->active_timeout) { - return time_msec() > nf_flow->last_expired + nf->active_timeout; - } + uint32_t hash = 0; + + hash = mhash_add(hash, (OVS_FORCE uint32_t) flow->in_port.ofp_port); + hash = mhash_add(hash, ntohl(flow->nw_src)); + hash = mhash_add(hash, ntohl(flow->nw_dst)); + hash = mhash_add(hash, flow->nw_tos); + hash = mhash_add(hash, flow->nw_proto); + hash = mhash_add(hash, ntohs(flow->tp_src)); + hash = mhash_add(hash, ntohs(flow->tp_dst)); - return false; + return mhash_finish(hash, 28); }