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vr_flow.c
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vr_flow.c
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/*
* vr_flow.c -- flow handling
*
* Copyright (c) 2013 Juniper Networks, Inc. All rights reserved.
*/
#include <vr_os.h>
#include <vr_types.h>
#include <vrouter.h>
#include <vr_packet.h>
#include <vr_htable.h>
#include <vr_flow.h>
#include <vr_mirror.h>
#include "vr_interface.h"
#include "vr_sandesh.h"
#include "vr_message.h"
#include "vr_btable.h"
#include "vr_fragment.h"
#include "vr_datapath.h"
#include "vr_hash.h"
#include "vr_ip_mtrie.h"
#define VR_NUM_FLOW_TABLES 1
#define VR_NUM_OFLOW_TABLES 1
#define VR_DEF_MAX_FLOW_TABLE_HOLD_COUNT 8192
unsigned int vr_flow_entries = VR_DEF_FLOW_ENTRIES;
unsigned int vr_oflow_entries = 0;
/*
* host can provide its own memory . Point in case is the DPDK. In DPDK,
* we allocate the table from hugepages and just ask the flow module to
* use those tables
*/
void *vr_flow_table;
void *vr_oflow_table;
/*
* The flow table memory can also be a file that could be mapped. The path
* is set by somebody and passed to agent for it to map
*/
unsigned char *vr_flow_path;
unsigned int vr_flow_hold_limit = VR_DEF_MAX_FLOW_TABLE_HOLD_COUNT;
#if defined(__linux__) && defined(__KERNEL__)
extern unsigned short vr_flow_major;
#endif
uint32_t vr_hashrnd = 0;
int hashrnd_inited = 0;
static void vr_flush_entry(struct vrouter *, struct vr_flow_entry *,
struct vr_flow_md *, struct vr_forwarding_md *);
static void __vr_flow_flush_hold_queue(struct vrouter *, struct vr_flow_entry *,
struct vr_forwarding_md *, struct vr_flow_queue *);
static void vr_flow_set_forwarding_md(struct vrouter *, struct vr_flow_entry *,
unsigned int, struct vr_forwarding_md *);
static int
__vr_flow_schedule_transition(struct vrouter *, struct vr_flow_entry *,
unsigned int, unsigned short);
static bool vr_flow_is_fat_flow(struct vrouter *, struct vr_packet *,
struct vr_flow_entry *);
struct vr_flow_entry *vr_find_flow(struct vrouter *, struct vr_flow *,
uint8_t, unsigned int *);
unsigned int vr_trap_flow(struct vrouter *, struct vr_flow_entry *,
struct vr_packet *, unsigned int, struct vr_flow_stats *);
void get_random_bytes(void *buf, int nbytes);
#ifdef __FreeBSD__
uint32_t
jhash(void *key, uint32_t length, uint32_t initval);
#endif
#ifdef __FreeBSD__
uint32_t
jhash(void *key, uint32_t length, uint32_t initval)
{
uint32_t ret = 0;
int i;
unsigned char *data = (unsigned char *)key;
for (i = 0; i < length; i ++)
ret += data[i];
return ret;
}
#endif
bool
vr_valid_link_local_port(struct vrouter *router, int family,
int proto, int port)
{
unsigned char data;
unsigned int tmp;
if (!router->vr_link_local_ports)
return false;
if ((family != AF_INET) ||
((proto != VR_IP_PROTO_TCP) && (proto != VR_IP_PROTO_UDP)))
return false;
if ((port < VR_DYNAMIC_PORT_START) || (port > VR_DYNAMIC_PORT_END))
return false;
tmp = port - VR_DYNAMIC_PORT_START;
if (proto == VR_IP_PROTO_UDP)
tmp += (router->vr_link_local_ports_size * 8 / 2);
data = router->vr_link_local_ports[(tmp / 8)];
if (data & (1 << (tmp % 8)))
return true;
return false;
}
static void
vr_clear_link_local_port(struct vrouter *router, int family,
int proto, int port)
{
unsigned char *data;
unsigned int tmp;
if (!router->vr_link_local_ports)
return;
if ((family != AF_INET) ||
((proto != VR_IP_PROTO_TCP) && (proto != VR_IP_PROTO_UDP)))
return;
if ((port < VR_DYNAMIC_PORT_START) || (port > VR_DYNAMIC_PORT_END))
return;
tmp = port - VR_DYNAMIC_PORT_START;
if (proto == VR_IP_PROTO_UDP)
tmp += (router->vr_link_local_ports_size * 8 / 2);
data = &router->vr_link_local_ports[(tmp / 8)];
*data &= (~(1 << (tmp % 8)));
return;
}
static void
vr_set_link_local_port(struct vrouter *router, int family,
int proto, int port)
{
unsigned char *data;
unsigned int tmp;
if (!router->vr_link_local_ports)
return;
if ((family != AF_INET) ||
((proto != VR_IP_PROTO_TCP) && (proto != VR_IP_PROTO_UDP)))
return;
if ((port < VR_DYNAMIC_PORT_START) || (port > VR_DYNAMIC_PORT_END))
return;
tmp = port - VR_DYNAMIC_PORT_START;
if (proto == VR_IP_PROTO_UDP)
tmp += (router->vr_link_local_ports_size * 8 / 2);
data = &router->vr_link_local_ports[tmp / 8];
*data |= (1 << (tmp % 8));
return;
}
static void
vr_flow_reset_mirror(struct vrouter *router, struct vr_flow_entry *fe,
unsigned int index)
{
if (fe->fe_flags & VR_FLOW_FLAG_MIRROR) {
fe->fe_mirror_id = VR_MAX_MIRROR_INDICES;
fe->fe_sec_mirror_id = VR_MAX_MIRROR_INDICES;
if (fe->fe_mme) {
vr_mirror_meta_entry_del(router, fe->fe_mme);
fe->fe_mme = NULL;
}
}
fe->fe_flags &= ~VR_FLOW_FLAG_MIRROR;
fe->fe_mirror_id = VR_MAX_MIRROR_INDICES;
fe->fe_sec_mirror_id = VR_MAX_MIRROR_INDICES;
return;
}
static void
vr_init_flow_entry(struct vr_flow_entry *fe)
{
fe->fe_rflow = -1;
fe->fe_mirror_id = VR_MAX_MIRROR_INDICES;
fe->fe_sec_mirror_id = VR_MAX_MIRROR_INDICES;
fe->fe_ecmp_nh_index = -1;
return;
}
static void
__vr_flow_reset_entry(struct vrouter *router, struct vr_flow_entry *fe)
{
if (fe->fe_hold_list) {
vr_printf("vrouter: Potential memory leak @ %s:%d\n",
__FILE__, __LINE__);
}
fe->fe_hold_list = NULL;
fe->fe_key.flow_key_len = 0;
vr_flow_reset_mirror(router, fe, fe->fe_hentry.hentry_index);
fe->fe_ecmp_nh_index = -1;
fe->fe_src_nh_index = NH_DISCARD_ID;
fe->fe_rflow = -1;
fe->fe_action = VR_FLOW_ACTION_DROP;
fe->fe_udp_src_port = 0;
fe->fe_tcp_flags = 0;
fe->fe_flags &=
(VR_FLOW_FLAG_ACTIVE | VR_FLOW_FLAG_EVICTED |
VR_FLOW_FLAG_NEW_FLOW | VR_FLOW_FLAG_DELETE_MARKED);
fe->fe_ttl = 0;
return;
}
static void
vr_flow_reset_entry(struct vrouter *router, struct vr_flow_entry *fe)
{
__vr_flow_reset_entry(router, fe);
memset(&fe->fe_stats, 0, sizeof(fe->fe_stats));
fe->fe_type = VP_TYPE_NULL;
fe->fe_flags = 0;
vr_htable_release_hentry(router->vr_flow_table, &fe->fe_hentry);
return;
}
static void
vr_flow_reset_active_entry(struct vrouter *router, struct vr_flow_entry *fe)
{
__vr_flow_reset_entry(router, fe);
vr_htable_release_hentry(router->vr_flow_table, &fe->fe_hentry);
return;
}
static vr_hentry_key
vr_flow_get_key(vr_htable_t flow_table, vr_hentry_t *entry,
unsigned int *key_len)
{
struct vr_flow_entry *fe = CONTAINER_OF(fe_hentry,
struct vr_flow_entry, entry);
if ((fe->fe_flags & VR_FLOW_FLAG_DELETE_MARKED) ||
!(fe->fe_flags & VR_FLOW_FLAG_ACTIVE))
return NULL;
if (key_len)
*key_len = fe->fe_key.flow_key_len;
return &fe->fe_key;
}
static inline bool
vr_flow_set_active(struct vr_flow_entry *fe)
{
return __sync_bool_compare_and_swap(&fe->fe_flags,
fe->fe_flags & ~VR_FLOW_FLAG_ACTIVE,
VR_FLOW_FLAG_ACTIVE | VR_FLOW_FLAG_NEW_FLOW);
}
unsigned int
vr_flow_table_size(struct vrouter *router)
{
return vr_htable_size(router->vr_flow_table);
}
unsigned int
vr_flow_table_used_oflow_entries(struct vrouter *router)
{
return vr_htable_used_oflow_entries(router->vr_flow_table);
}
unsigned int
vr_flow_table_used_total_entries(struct vrouter *router)
{
return vr_htable_used_total_entries(router->vr_flow_table);
}
/*
* this is used by the mmap code. mmap sees the whole flow table
* (including the overflow table) as one large table. so, given
* an offset into that large memory, we should return the correct
* virtual address
*/
void *
vr_flow_get_va(struct vrouter *router, uint64_t offset)
{
return vr_htable_get_address(router->vr_flow_table, offset);
}
static struct vr_flow_entry *
__vr_flow_get_entry(struct vrouter *router, int index)
{
struct vr_flow_entry *fe;
if (index < 0)
return NULL;
fe = (struct vr_flow_entry *)
__vr_htable_get_hentry_by_index(router->vr_flow_table, index);
if (fe && (fe->fe_flags & VR_FLOW_FLAG_ACTIVE))
return fe;
return NULL;
}
struct vr_flow_entry *
vr_flow_get_entry(struct vrouter *router, int index)
{
if (index < 0)
return NULL;
return (struct vr_flow_entry *)
vr_htable_get_hentry_by_index(router->vr_flow_table, index);
}
static inline void
vr_flow_stop_modify(struct vrouter *router, struct vr_flow_entry *fe)
{
if (!fe)
return;
(void)__sync_and_and_fetch(&fe->fe_flags, ~VR_FLOW_FLAG_MODIFIED);
return;
}
static inline bool
vr_flow_start_modify(struct vrouter *router, struct vr_flow_entry *fe)
{
unsigned short flags;
flags = fe->fe_flags;
if (!(flags & (VR_FLOW_FLAG_MODIFIED | VR_FLOW_FLAG_EVICTED |
VR_FLOW_FLAG_NEW_FLOW))) {
if (__sync_bool_compare_and_swap(&fe->fe_flags, flags,
flags | VR_FLOW_FLAG_MODIFIED)) {
return true;
}
}
return false;
}
/* Non-static due to RCU callback pointer comparison in vRouter/DPDK */
void
vr_flow_flush_hold_queue(struct vrouter *router, struct vr_flow_entry *fe,
struct vr_flow_queue *vfq)
{
struct vr_forwarding_md fmd;
if (vfq) {
vr_init_forwarding_md(&fmd);
vr_flow_set_forwarding_md(router, fe, vfq->vfq_index, &fmd);
__vr_flow_flush_hold_queue(router, fe, &fmd, vfq);
}
return;
}
static void
vr_flow_evict_flow(struct vrouter *router, struct vr_flow_entry *fe)
{
unsigned short flags;
if (!fe)
return;
if ((fe->fe_flags & VR_FLOW_FLAG_ACTIVE) &&
(fe->fe_flags & VR_FLOW_FLAG_EVICT_CANDIDATE)) {
flags = fe->fe_flags | VR_FLOW_FLAG_ACTIVE |
VR_FLOW_FLAG_EVICT_CANDIDATE;
if (__sync_bool_compare_and_swap(&fe->fe_flags, flags,
(flags ^ VR_FLOW_FLAG_EVICT_CANDIDATE) |
VR_FLOW_FLAG_EVICTED)) {
vr_flow_stop_modify(router, fe);
vr_flow_reset_active_entry(router, fe);
}
}
return;
}
void
vr_flow_defer_cb(struct vrouter *router, void *arg)
{
struct vr_defer_data *defer;
struct vr_flow_entry *fe, *rfe;
struct vr_flow_queue *vfq;
struct vr_flow_defer_data *vfdd;
defer = (struct vr_defer_data *)arg;
if (!defer)
return;
vfdd = (struct vr_flow_defer_data *)defer->vdd_data;
if (!vfdd)
return;
fe = vfdd->vfdd_fe;
vfq = (struct vr_flow_queue *)vfdd->vfdd_flow_queue;
if (vfq) {
vr_flow_flush_hold_queue(router, fe, vfq);
vr_free(vfq, VR_FLOW_QUEUE_OBJECT);
vfdd->vfdd_flow_queue = NULL;
}
if (vfdd->vfdd_delete) {
vr_flow_reset_entry(router, fe);
} else {
rfe = vr_flow_get_entry(router, fe->fe_rflow);
vr_flow_evict_flow(router, fe);
if (rfe)
vr_flow_evict_flow(router, rfe);
}
vr_free(vfdd, VR_FLOW_DEFER_DATA_OBJECT);
return;
}
static void
vr_flow_reset_evict(struct vrouter *router, struct vr_flow_entry *fe)
{
unsigned short flags;
if (!fe)
return;
flags = fe->fe_flags;
if (flags & VR_FLOW_FLAG_EVICT_CANDIDATE) {
(void)__sync_bool_compare_and_swap(&fe->fe_flags, flags,
(flags ^ VR_FLOW_FLAG_EVICT_CANDIDATE));
}
vr_flow_stop_modify(router, fe);
return;
}
static void
vr_flow_defer(struct vr_flow_md *flmd, struct vr_flow_entry *fe)
{
struct vr_flow_entry *rfe;
struct vr_defer_data *vdd = flmd->flmd_defer_data;
struct vr_flow_defer_data *vfdd;
if (!vdd || !vdd->vdd_data) {
if (flmd->flmd_flags & VR_FLOW_FLAG_EVICT_CANDIDATE) {
if (fe->fe_rflow) {
rfe = vr_flow_get_entry(flmd->flmd_router, fe->fe_rflow);
vr_flow_reset_evict(flmd->flmd_router, rfe);
}
vr_flow_reset_evict(flmd->flmd_router, fe);
}
if (!(flmd->flmd_flags & VR_FLOW_FLAG_ACTIVE)) {
vr_flow_reset_entry(flmd->flmd_router, fe);
}
return;
}
vfdd = (struct vr_flow_defer_data *)vdd->vdd_data;
vfdd->vfdd_fe = fe;
vr_defer(flmd->flmd_router, vr_flow_defer_cb, (void *)vdd);
flmd->flmd_defer_data = NULL;
return;
}
static struct vr_flow_entry *
vr_flow_table_get_free_entry(struct vrouter *router, struct vr_flow *key,
unsigned int *free_index)
{
unsigned short flags;
struct vr_flow_entry *fe;
fe = (struct vr_flow_entry *)
vr_htable_find_free_hentry(router->vr_flow_table, key,
key->flow_key_len);
if (fe) {
flags = fe->fe_flags;
if (!(flags & VR_FLOW_FLAG_ACTIVE)) {
if (vr_flow_set_active(fe)) {
vr_init_flow_entry(fe);
}
} else if (flags & VR_FLOW_FLAG_EVICTED) {
fe->fe_flags = ((flags & ~VR_FLOW_FLAG_EVICTED) |
VR_FLOW_FLAG_NEW_FLOW);
}
fe->fe_gen_id = (fe->fe_gen_id + 1) %
(1 << (8 * sizeof(fe->fe_gen_id)));
*free_index = fe->fe_hentry.hentry_index;
}
return fe;
}
static struct vr_flow_entry *
vr_flow_get_free_entry(struct vrouter *router, struct vr_flow *key, uint8_t type,
bool need_hold, unsigned int *fe_index)
{
struct vr_flow_entry *fe = NULL;
fe = vr_flow_table_get_free_entry(router, key, fe_index);
if (fe) {
if (need_hold) {
fe->fe_hold_list = vr_zalloc(sizeof(struct vr_flow_queue),
VR_FLOW_QUEUE_OBJECT);
if (!fe->fe_hold_list) {
vr_flow_reset_entry(router, fe);
fe = NULL;
} else {
fe->fe_hold_list->vfq_index = *fe_index;
}
}
fe->fe_type = type;
memcpy(&fe->fe_key, key, key->flow_key_len);
fe->fe_key.flow_key_len = key->flow_key_len;
}
return fe;
}
struct vr_flow_entry *
vr_find_flow(struct vrouter *router, struct vr_flow *key,
uint8_t type, unsigned int *fe_index)
{
struct vr_flow_entry *fe;
fe = (struct vr_flow_entry *)vr_htable_find_hentry(router->vr_flow_table,
key, key->flow_key_len);
if (fe) {
if (fe_index)
*fe_index = fe->fe_hentry.hentry_index;
}
return fe;
}
void
vr_flow_fill_pnode(struct vr_packet_node *pnode, struct vr_packet *pkt,
struct vr_forwarding_md *fmd)
{
struct vr_ip *ip = (struct vr_ip *)pkt_inner_network_header(pkt);
/*
* we cannot cache nexthop here. to cache, we need to hold reference
* to the nexthop. to hold a reference, we will have to hold a lock,
* which we cannot. the only known case of misbehavior if we do not
* cache is ECMP. when the packet comes from the fabric, the nexthop
* actually points to a local composite, whereas a route lookup actually
* returns a different nexthop, in which case the ecmp index will return
* a bad nexthop. to avoid that, we will cache the label, and reuse it
*/
pkt->vp_nh = NULL;
pnode->pl_flags = 0;
pnode->pl_vif_idx = pkt->vp_if->vif_idx;
if (fmd) {
pnode->pl_outer_src_ip = fmd->fmd_outer_src_ip;
pnode->pl_label = fmd->fmd_label;
if (vr_forwarding_md_label_is_vxlan_id(fmd))
pnode->pl_flags |= PN_FLAG_LABEL_IS_VXLAN_ID;
if (fmd->fmd_to_me)
pnode->pl_flags |= PN_FLAG_TO_ME;
}
if (ip && vr_ip_is_ip4(ip)) {
/*
* Source IP & Dest IP can change while the packet is in the queue
* (NAT). For e.g.: when the cloned head of a fragment is enqueued
* to the assembler and subsequently dequeued by the assembler, the
* original packet might have undergone a NAT, resulting in wrong
* hash and thus a wrong search for other fragments of the packet.
* Hence, store them here for others interested in the original IPs
*/
pnode->pl_inner_src_ip = ip->ip_saddr;
pnode->pl_inner_dst_ip = ip->ip_daddr;
if (vr_ip_fragment_head(ip))
pnode->pl_flags |= PN_FLAG_FRAGMENT_HEAD;
}
pnode->pl_dscp = fmd->fmd_dscp;
pnode->pl_dotonep = fmd->fmd_dotonep;
pnode->pl_vrf = fmd->fmd_dvrf;
pnode->pl_vlan = fmd->fmd_vlan;
__sync_synchronize();
pnode->pl_packet = pkt;
return;
}
static int
vr_enqueue_flow(struct vrouter *router, struct vr_flow_entry *fe,
struct vr_packet *pkt, unsigned int index,
struct vr_flow_stats *stats, struct vr_forwarding_md *fmd)
{
unsigned int i;
unsigned short drop_reason = 0;
struct vr_flow_queue *vfq = fe->fe_hold_list;
struct vr_packet_node *pnode;
if (!vfq) {
drop_reason = VP_DROP_FLOW_UNUSABLE;
goto drop;
}
i = __sync_fetch_and_add(&vfq->vfq_entries, 1);
if (i >= VR_MAX_FLOW_QUEUE_ENTRIES) {
drop_reason = VP_DROP_FLOW_QUEUE_LIMIT_EXCEEDED;
goto drop;
}
pnode = &vfq->vfq_pnodes[i];
vr_flow_fill_pnode(pnode, pkt, fmd);
if (!i)
vr_trap_flow(router, fe, pkt, index, stats);
return 0;
drop:
vr_pfree(pkt, drop_reason);
return 0;
}
static flow_result_t
vr_flow_nat(struct vr_flow_entry *fe,
struct vr_packet *pkt, struct vr_forwarding_md *fmd)
{
if (pkt->vp_type == VP_TYPE_IP)
return vr_inet_flow_nat(fe, pkt, fmd);
vr_pfree(pkt, VP_DROP_FLOW_ACTION_INVALID);
return FLOW_CONSUMED;
}
static void
vr_flow_set_forwarding_md(struct vrouter *router, struct vr_flow_entry *fe,
unsigned int index, struct vr_forwarding_md *md)
{
struct vr_flow_entry *rfe;
md->fmd_flow_index = index;
md->fmd_ecmp_nh_index = fe->fe_ecmp_nh_index;
md->fmd_udp_src_port = fe->fe_udp_src_port;
if (fe->fe_flags & VR_RFLOW_VALID) {
rfe = vr_flow_get_entry(router, fe->fe_rflow);
if (rfe)
md->fmd_ecmp_src_nh_index = rfe->fe_ecmp_nh_index;
}
return;
}
static bool
__vr_flow_mark_evict(struct vrouter *router, struct vr_flow_entry *fe)
{
unsigned short flags;
flags = fe->fe_flags;
if (flags & VR_FLOW_FLAG_ACTIVE) {
flags = __sync_fetch_and_or(&fe->fe_flags,
VR_FLOW_FLAG_EVICT_CANDIDATE);
if (!(flags & VR_FLOW_FLAG_EVICT_CANDIDATE)) {
return true;
}
}
return false;
}
static void
vr_flow_mark_evict(struct vrouter *router, struct vr_flow_entry *fe,
unsigned int index)
{
bool evict_forward_flow = true;
struct vr_flow_entry *rfe = NULL;
/* start modifying the entry */
if (!vr_flow_start_modify(router, fe)) {
return;
}
if (fe->fe_rflow >= 0) {
rfe = vr_flow_get_entry(router, fe->fe_rflow);
if (rfe) {
evict_forward_flow = false;
if (rfe->fe_tcp_flags & VR_FLOW_TCP_DEAD) {
if (!vr_flow_start_modify(router, rfe)) {
/* no modification. hence...*/
rfe = NULL;
} else {
/* we do not want hold flows to be evicted, just yet */
if (((rfe->fe_rflow == index) || (rfe->fe_rflow < 0)) &&
(rfe->fe_action != VR_FLOW_ACTION_HOLD)) {
evict_forward_flow = __vr_flow_mark_evict(router, rfe);
}
}
} else {
/* no modification. hence...*/
rfe = NULL;
}
}
}
/*
* presence of rfe means that we might need to reset the evict bit
* or at the minimum reset the modified bit under failure conditions
*/
if (evict_forward_flow) {
if (__vr_flow_mark_evict(router, fe)) {
if (!__vr_flow_schedule_transition(router, fe,
index, fe->fe_flags)) {
return;
} else {
goto reset_evict;
}
}
}
/* stop modifying the forward and the reverse */
if (rfe)
vr_flow_stop_modify(router, rfe);
vr_flow_stop_modify(router, fe);
return;
reset_evict:
if (rfe)
vr_flow_reset_evict(router, rfe);
vr_flow_reset_evict(router, fe);
return;
}
int16_t
vr_flow_get_qos(struct vrouter *router, struct vr_packet *pkt,
struct vr_forwarding_md *fmd)
{
struct vr_flow_entry *fe;
if (fmd->fmd_flow_index >= 0) {
fe = vr_flow_get_entry(router, fmd->fmd_flow_index);
if (fe)
return fe->fe_qos_id;
}
return -1;
}
static flow_result_t
vr_flow_action(struct vrouter *router, struct vr_flow_entry *fe,
unsigned int index, struct vr_packet *pkt,
struct vr_forwarding_md *fmd)
{
int valid_src;
unsigned int ip_inc_diff_cksum = 0;
struct vr_ip *ip;
flow_result_t result;
struct vr_forwarding_md mirror_fmd;
struct vr_nexthop *src_nh;
struct vr_packet *pkt_clone;
fmd->fmd_dvrf = fe->fe_vrf;
/*
* for now, we will not use dvrf if VRFT is set, because the RPF
* check needs to happen in the source vrf
*/
src_nh = __vrouter_get_nexthop(router, fe->fe_src_nh_index);
if (!src_nh) {
vr_pfree(pkt, VP_DROP_INVALID_NH);
return FLOW_CONSUMED;
}
if (src_nh->nh_validate_src) {
valid_src = src_nh->nh_validate_src(pkt, src_nh, fmd, NULL);
if (valid_src == NH_SOURCE_INVALID) {
vr_pfree(pkt, VP_DROP_INVALID_SOURCE);
return FLOW_CONSUMED;
}
if (valid_src == NH_SOURCE_MISMATCH) {
pkt_clone = vr_pclone(pkt);
if (pkt_clone) {
vr_preset(pkt_clone);
if (vr_pcow(pkt_clone, sizeof(struct vr_eth) +
sizeof(struct agent_hdr))) {
vr_pfree(pkt_clone, VP_DROP_PCOW_FAIL);
} else {
vr_trap(pkt_clone, fmd->fmd_dvrf,
AGENT_TRAP_ECMP_RESOLVE, &fmd->fmd_flow_index);
}
}
}
}
if (fe->fe_flags & VR_FLOW_FLAG_VRFT) {
if (fmd->fmd_dvrf != fe->fe_dvrf) {
fmd->fmd_dvrf = fe->fe_dvrf;
fmd->fmd_to_me = 1;
}
}
if (fe->fe_flags & VR_FLOW_FLAG_MIRROR) {
if (fe->fe_mirror_id < VR_MAX_MIRROR_INDICES) {
mirror_fmd = *fmd;
mirror_fmd.fmd_ecmp_nh_index = -1;
vr_mirror(router, fe->fe_mirror_id, pkt, &mirror_fmd,
MIRROR_TYPE_ACL);
}
if (fe->fe_sec_mirror_id < VR_MAX_MIRROR_INDICES) {
mirror_fmd = *fmd;
mirror_fmd.fmd_ecmp_nh_index = -1;
vr_mirror(router, fe->fe_sec_mirror_id, pkt, &mirror_fmd,
MIRROR_TYPE_ACL);
}
}
switch (fe->fe_action) {
case VR_FLOW_ACTION_DROP:
vr_pfree(pkt, VP_DROP_FLOW_ACTION_DROP);
result = FLOW_CONSUMED;
break;
case VR_FLOW_ACTION_FORWARD:
result = FLOW_FORWARD;
break;
case VR_FLOW_ACTION_NAT:
result = vr_flow_nat(fe, pkt, fmd);
break;
default:
vr_pfree(pkt, VP_DROP_FLOW_ACTION_INVALID);
result = FLOW_CONSUMED;
break;
}
if (result == FLOW_FORWARD) {
if (pkt->vp_type == VP_TYPE_IP) {
ip = (struct vr_ip *)pkt_network_header(pkt);
if (ip) {
if (fe->fe_ttl && (fe->fe_ttl != ip->ip_ttl)) {
vr_incremental_diff(ip->ip_ttl, fe->fe_ttl, &ip_inc_diff_cksum);
ip->ip_ttl = fe->fe_ttl;
if (ip_inc_diff_cksum)
vr_ip_incremental_csum(ip, ip_inc_diff_cksum);
}
}
}
}
if (fe->fe_tcp_flags & VR_FLOW_TCP_DEAD)
vr_flow_mark_evict(router, fe, index);
return result;
}
unsigned int
vr_trap_flow(struct vrouter *router, struct vr_flow_entry *fe,
struct vr_packet *pkt, unsigned int index,
struct vr_flow_stats *stats)
{
unsigned int trap_reason;
struct vr_packet *npkt;
struct vr_flow_trap_arg ta;
npkt = vr_pclone(pkt);
if (!npkt)
return -ENOMEM;
vr_preset(npkt);
switch (fe->fe_flags & VR_FLOW_FLAG_TRAP_MASK) {
default:
/*
* agent needs a method to identify new flows from existing flows.
* existing flows can be reused (evicted) or the action of such flows
* can become hold. If existing flows are reused and packet is trapped,
* agent will not re-evaluate the flow. Hence, agent has to be told
* that this is a new flow, which we indicate by the trap reason.
*/
if (fe->fe_flags & VR_FLOW_FLAG_NEW_FLOW) {
trap_reason = AGENT_TRAP_FLOW_MISS;
fe->fe_flags ^= VR_FLOW_FLAG_NEW_FLOW;
} else {
trap_reason = AGENT_TRAP_FLOW_ACTION_HOLD;
}
ta.vfta_index = index;
if ((fe->fe_type == VP_TYPE_IP) || (fe->fe_type == VP_TYPE_IP6))
ta.vfta_nh_index = fe->fe_key.flow_nh_id;
if (stats) {
ta.vfta_stats = *stats;
} else {
ta.vfta_stats = fe->fe_stats;
}
ta.vfta_gen_id = fe->fe_gen_id;
break;
}
return vr_trap(npkt, fe->fe_vrf, trap_reason, &ta);
}
static flow_result_t
vr_do_flow_action(struct vrouter *router, struct vr_flow_entry *fe,
unsigned int index, struct vr_packet *pkt,
struct vr_forwarding_md *fmd)
{
uint32_t new_stats;
struct vr_flow_stats stats, *stats_p = NULL;
if (fe->fe_flags & VR_FLOW_FLAG_NEW_FLOW) {
memcpy(&stats, &fe->fe_stats, sizeof(fe->fe_stats));
memset(&fe->fe_stats, 0, sizeof(fe->fe_stats));
stats_p = &stats;
}
new_stats = __sync_add_and_fetch(&fe->fe_stats.flow_bytes, pkt_len(pkt));
if (new_stats < pkt_len(pkt))
fe->fe_stats.flow_bytes_oflow++;
new_stats = __sync_add_and_fetch(&fe->fe_stats.flow_packets, 1);
if (!new_stats)
fe->fe_stats.flow_packets_oflow++;
if (fe->fe_action == VR_FLOW_ACTION_HOLD) {
vr_enqueue_flow(router, fe, pkt, index, stats_p, fmd);
return FLOW_HELD;
}
return vr_flow_action(router, fe, index, pkt, fmd);
}
static unsigned int
vr_flow_table_hold_count(struct vrouter *router)
{
unsigned int i, num_cpus;
uint64_t hcount = 0, act_count;
struct vr_flow_table_info *infop = router->vr_flow_table_info;
num_cpus = vr_num_cpus;
for (i = 0; i < num_cpus; i++)
hcount += infop->vfti_hold_count[i];
act_count = infop->vfti_action_count;
if (hcount >= act_count)
return hcount - act_count;
return 0;
}
static void
vr_flow_entry_set_hold(struct vrouter *router, struct vr_flow_entry *flow_e)
{
unsigned int cpu;
uint64_t act_count;
struct vr_flow_table_info *infop = router->vr_flow_table_info;
cpu = vr_get_cpu();
if (cpu >= vr_num_cpus) {
vr_printf("vrouter: Set HOLD failed (cpu %u num_cpus %u)\n",
cpu, vr_num_cpus);
return;
}
flow_e->fe_action = VR_FLOW_ACTION_HOLD;