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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_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_DEF_FLOW_ENTRIES (512 * 1024)
#define VR_NUM_OFLOW_TABLES 1
#define VR_DEF_OFLOW_ENTRIES (8 * 1024)
#define VR_FLOW_ENTRIES_PER_BUCKET 4U
#define VR_MAX_FLOW_TABLE_HOLD_COUNT \
4096
unsigned int vr_flow_entries = VR_DEF_FLOW_ENTRIES;
unsigned int vr_oflow_entries = VR_DEF_OFLOW_ENTRIES;
/*
* host can provide its own btables. Point in case is the DPDK. In DPDK,
* we allocate the table from hugepages and just ask the flow module to
* use those tables
*/
struct vr_btable *vr_flow_table;
struct vr_btable *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 = 1;
#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_flush_flow_queue(struct vrouter *, struct vr_flow_entry *,
struct vr_forwarding_md *, struct vr_flow_queue *);
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);
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) {
vrouter_put_mirror(router, fe->fe_mirror_id);
fe->fe_mirror_id = VR_MAX_MIRROR_INDICES;
vrouter_put_mirror(router, fe->fe_sec_mirror_id);
fe->fe_sec_mirror_id = VR_MAX_MIRROR_INDICES;
vr_mirror_meta_entry_del(router, index);
}
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_reset_flow_entry(struct vrouter *router, struct vr_flow_entry *fe,
unsigned int index)
{
memset(&fe->fe_stats, 0, sizeof(fe->fe_stats));
if (fe->fe_hold_list) {
vr_printf("vrouter: Potential memory leak @ %s:%d\n",
__FILE__, __LINE__);
}
fe->fe_hold_list = NULL;
fe->fe_key.key_len = 0;
fe->fe_type = VP_TYPE_NULL;
memset(&fe->fe_key, 0, sizeof(fe->fe_key));
vr_flow_reset_mirror(router, fe, 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_flags = 0;
fe->fe_udp_src_port = 0;
return;
}
static inline bool
vr_set_flow_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);
}
static inline struct vr_flow_entry *
vr_flow_table_entry_get(struct vrouter *router, unsigned int i)
{
return (struct vr_flow_entry *)vr_btable_get(router->vr_flow_table, i);
}
static inline struct vr_flow_entry *
vr_oflow_table_entry_get(struct vrouter *router, unsigned int i)
{
return (struct vr_flow_entry *)vr_btable_get(router->vr_oflow_table, i);
}
unsigned int
vr_flow_table_size(struct vrouter *router)
{
return vr_btable_size(router->vr_flow_table);
}
unsigned int
vr_oflow_table_size(struct vrouter *router)
{
return vr_btable_size(router->vr_oflow_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)
{
struct vr_btable *table = router->vr_flow_table;
unsigned int size = vr_flow_table_size(router);
if (offset >= vr_flow_table_size(router)) {
table = router->vr_oflow_table;
offset -= size;
}
return vr_btable_get_address(table, offset);
}
struct vr_flow_entry *
vr_get_flow_entry(struct vrouter *router, int index)
{
struct vr_btable *table;
if (index < 0)
return NULL;
if ((unsigned int)index < vr_flow_entries)
table = router->vr_flow_table;
else {
table = router->vr_oflow_table;
index -= vr_flow_entries;
if ((unsigned int)index >= vr_oflow_entries)
return NULL;
}
return (struct vr_flow_entry *)vr_btable_get(table, index);
}
static void
vr_flow_queue_free(struct vrouter *router, void *arg)
{
struct vr_forwarding_md fmd;
struct vr_defer_data *defer;
struct vr_flow_entry *fe;
struct vr_flow_queue *vfq;
defer = (struct vr_defer_data *)arg;
if (!defer)
return;
vr_init_forwarding_md(&fmd);
vfq = (struct vr_flow_queue *)defer->vdd_data;
fe = vr_get_flow_entry(router, vfq->vfq_index);
vr_flush_flow_queue(router, fe, &fmd, vfq);
vr_free(vfq);
return;
}
static void
vr_flow_queue_free_defer(struct vr_flow_md *flmd, struct vr_flow_queue *vfq)
{
struct vr_defer_data *vdd = flmd->flmd_defer_data;
if (!vdd) {
vr_free(vfq);
return;
}
vdd->vdd_data = (void *)vfq;
vr_defer(flmd->flmd_router, vr_flow_queue_free, (void *)vdd);
flmd->flmd_defer_data = NULL;
return;
}
static struct vr_flow_entry *
vr_find_free_entry(struct vrouter *router, struct vr_flow *key, uint8_t type,
bool need_hold, unsigned int *fe_index)
{
unsigned int i, index, hash;
struct vr_flow_entry *tmp_fe, *fe = NULL;
*fe_index = 0;
hash = vr_hash(key, key->key_len, 0);
index = (hash % vr_flow_entries) & ~(VR_FLOW_ENTRIES_PER_BUCKET - 1);
for (i = 0; i < VR_FLOW_ENTRIES_PER_BUCKET; i++) {
tmp_fe = vr_flow_table_entry_get(router, index);
if (tmp_fe && !(tmp_fe->fe_flags & VR_FLOW_FLAG_ACTIVE)) {
if (vr_set_flow_active(tmp_fe)) {
vr_init_flow_entry(tmp_fe);
fe = tmp_fe;
break;
}
}
index++;
}
if (!fe) {
index = hash % vr_oflow_entries;
for (i = 0; i < vr_oflow_entries; i++) {
tmp_fe = vr_oflow_table_entry_get(router, index);
if (tmp_fe && !(tmp_fe->fe_flags & VR_FLOW_FLAG_ACTIVE)) {
if (vr_set_flow_active(tmp_fe)) {
vr_init_flow_entry(tmp_fe);
fe = tmp_fe;
break;
}
}
index = (index + 1) % vr_oflow_entries;
}
if (fe)
*fe_index += vr_flow_entries;
}
if (fe) {
*fe_index += index;
if (need_hold) {
fe->fe_hold_list = vr_zalloc(sizeof(struct vr_flow_queue));
if (!fe->fe_hold_list) {
vr_reset_flow_entry(router, fe, *fe_index);
fe = NULL;
} else {
fe->fe_hold_list->vfq_index = *fe_index;
}
}
if (fe) {
fe->fe_type = type;
fe->fe_key.key_len = key->key_len;
memcpy(&fe->fe_key, key, key->key_len);
}
}
return fe;
}
static inline struct vr_flow_entry *
vr_flow_table_lookup(struct vr_flow *key, uint16_t type,
struct vr_btable *table, unsigned int table_size,
unsigned int bucket_size, unsigned int hash, unsigned int *fe_index)
{
unsigned int i;
struct vr_flow_entry *flow_e;
hash %= table_size;
if (!bucket_size) {
bucket_size = table_size;
} else {
hash &= ~(bucket_size - 1);
}
for (i = 0; i < bucket_size; i++) {
flow_e = (struct vr_flow_entry *)vr_btable_get(table,
(hash + i) % table_size);
if (flow_e &&
(flow_e->fe_flags & VR_FLOW_FLAG_ACTIVE) &&
(flow_e->fe_type == type)) {
if (!memcmp(&flow_e->fe_key, key, key->key_len)) {
*fe_index = (hash + i) % table_size;
return flow_e;
}
}
}
return NULL;
}
struct vr_flow_entry *
vr_find_flow(struct vrouter *router, struct vr_flow *key,
uint8_t type, unsigned int *fe_index)
{
unsigned int hash;
struct vr_flow_entry *flow_e;
hash = vr_hash(key, key->key_len, 0);
/* first look in the regular flow table */
flow_e = vr_flow_table_lookup(key, type, router->vr_flow_table,
vr_flow_entries, VR_FLOW_ENTRIES_PER_BUCKET, hash, fe_index);
/* if not in the regular flow table, lookup in the overflow flow table */
if (!flow_e) {
flow_e = vr_flow_table_lookup(key, type, router->vr_oflow_table,
vr_oflow_entries, 0, hash, fe_index);
*fe_index += vr_flow_entries;
}
return flow_e;
}
static int
vr_enqueue_flow(struct vrouter *router, struct vr_flow_entry *fe,
struct vr_packet *pkt, unsigned int index,
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];
/*
* 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
*/
if (pkt->vp_nh &&
(pkt->vp_nh->nh_type == NH_VRF_TRANSLATE) &&
(pkt->vp_nh->nh_flags & NH_FLAG_VNID))
pnode->pl_flags |= PN_FLAG_LABEL_IS_VNID;
pkt->vp_nh = NULL;
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 (fmd->fmd_to_me)
pnode->pl_flags |= PN_FLAG_TO_ME;
}
__sync_synchronize();
pnode->pl_packet = pkt;
if (!i)
vr_trap_flow(router, fe, pkt, index);
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_get_flow_entry(router, fe->fe_rflow);
if (rfe)
md->fmd_ecmp_src_nh_index = rfe->fe_ecmp_nh_index;
}
return;
}
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;
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
*/
vr_flow_set_forwarding_md(router, fe, index, fmd);
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);
}
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);
}
}
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;
}
return result;
}
unsigned int
vr_trap_flow(struct vrouter *router, struct vr_flow_entry *fe,
struct vr_packet *pkt, unsigned int index)
{
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:
trap_reason = AGENT_TRAP_FLOW_MISS;
ta.vfta_index = index;
if (fe->fe_type == VP_TYPE_IP)
ta.vfta_nh_index = fe->fe_key.flow4_nh_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;
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, 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;
if (infop->vfti_hold_count[cpu] + 1 < infop->vfti_hold_count[cpu]) {
(void)__sync_add_and_fetch(&infop->vfti_oflows, 1);
act_count = infop->vfti_action_count;
if (act_count > infop->vfti_hold_count[cpu]) {
(void)__sync_sub_and_fetch(&infop->vfti_action_count,
infop->vfti_hold_count[cpu]);
infop->vfti_hold_count[cpu] = 0;
} else {
infop->vfti_hold_count[cpu] -= act_count;
(void)__sync_sub_and_fetch(&infop->vfti_action_count,
act_count);
}
}
infop->vfti_hold_count[cpu]++;
return;
}
flow_result_t
vr_flow_lookup(struct vrouter *router, struct vr_flow *key,
struct vr_packet *pkt, struct vr_forwarding_md *fmd)
{
unsigned int fe_index;
struct vr_flow_entry *flow_e;
pkt->vp_flags |= VP_FLAG_FLOW_SET;
flow_e = vr_find_flow(router, key, pkt->vp_type, &fe_index);
if (!flow_e) {
if (pkt->vp_nh &&
(pkt->vp_nh->nh_flags & NH_FLAG_RELAXED_POLICY))
return FLOW_FORWARD;
if ((vr_flow_hold_limit) &&
(vr_flow_table_hold_count(router) >
VR_MAX_FLOW_TABLE_HOLD_COUNT)) {
vr_pfree(pkt, VP_DROP_FLOW_UNUSABLE);
return FLOW_CONSUMED;
}
flow_e = vr_find_free_entry(router, key, pkt->vp_type,
true, &fe_index);
if (!flow_e) {
vr_pfree(pkt, VP_DROP_FLOW_TABLE_FULL);
return FLOW_CONSUMED;
}
flow_e->fe_vrf = fmd->fmd_dvrf;
/* mark as hold */
vr_flow_entry_set_hold(router, flow_e);
}
return vr_do_flow_action(router, flow_e, fe_index, pkt, fmd);
}
static bool
__vr_flow_forward(flow_result_t result, struct vr_packet *pkt,
struct vr_forwarding_md *fmd)
{
bool forward = false;
switch (result) {
case FLOW_FORWARD:
forward = true;
break;
case FLOW_TRAP:
vr_trap(pkt, fmd->fmd_dvrf, AGENT_TRAP_L3_PROTOCOLS, NULL);
break;
case FLOW_HELD:
case FLOW_CONSUMED:
break;
case FLOW_DROP:
default:
vr_pfree(pkt, VP_DROP_FLOW_UNUSABLE);
break;
}
return forward;
}
bool
vr_flow_forward(struct vrouter *router, struct vr_packet *pkt,
struct vr_forwarding_md *fmd)
{
flow_result_t result;
/* Flow processig is only for untagged unicast IP packets */
if ((pkt->vp_type == VP_TYPE_IP) && (!(pkt->vp_flags & VP_FLAG_MULTICAST))
&& ((fmd->fmd_vlan == VLAN_ID_INVALID) || vif_is_service(pkt->vp_if)))
result = vr_inet_flow_lookup(router, pkt, fmd);
else
result = FLOW_FORWARD;
return __vr_flow_forward(result, pkt, fmd);
}
static void
vr_flush_flow_queue(struct vrouter *router, struct vr_flow_entry *fe,
struct vr_forwarding_md *fmd, struct vr_flow_queue *vfq)
{
unsigned int i;
bool forward;
struct vr_interface *vif;
struct vr_packet *pkt;
struct vr_packet_node *pnode;
flow_result_t result;
for (i = 0; i < VR_MAX_FLOW_QUEUE_ENTRIES; i++) {
pnode = &vfq->vfq_pnodes[i];
if (fmd) {
memset(fmd, 0, sizeof(*fmd));
fmd->fmd_outer_src_ip = pnode->pl_outer_src_ip;
fmd->fmd_label = pnode->pl_label;
if (pnode->pl_flags & PN_FLAG_TO_ME)
fmd->fmd_to_me = 1;
}
pkt = pnode->pl_packet;
if (!pkt)
continue;
pnode->pl_packet = NULL;
/*
* this is only a security check and not a catch all check. one note
* of caution. please do not access pkt->vp_if till the if block is
* succesfully bypassed
*/
vif = __vrouter_get_interface(router, pnode->pl_vif_idx);
if (!vif || (pkt->vp_if != vif)) {
vr_pfree(pkt, VP_DROP_INVALID_IF);
continue;
}
if (!pkt->vp_nh) {
if (vif_is_fabric(pkt->vp_if) && fmd &&
(fmd->fmd_label >= 0)) {
if (!(pnode->pl_flags & PN_FLAG_LABEL_IS_VNID))
pkt->vp_nh = __vrouter_get_label(router, fmd->fmd_label);
}
}
result = vr_flow_action(router, fe, vfq->vfq_index, pkt, fmd);
forward = __vr_flow_forward(result, pkt, fmd);
if (forward)
vr_reinject_packet(pkt, fmd);
pnode->pl_packet = NULL;
}
return;
}
static void
vr_flush_entry(struct vrouter *router, struct vr_flow_entry *fe,
struct vr_flow_md *flmd, struct vr_forwarding_md *fmd)
{
struct vr_flow_queue *vfq;
if (fe->fe_action == VR_FLOW_ACTION_HOLD)
return;
vfq = fe->fe_hold_list;
if (!vfq)
return;
fe->fe_hold_list = NULL;
vr_flush_flow_queue(router, fe, fmd, vfq);
vr_flow_queue_free_defer(flmd, vfq);
return;
}
static void
vr_flow_flush(void *arg)
{
struct vrouter *router;
struct vr_flow_entry *fe;
struct vr_forwarding_md fmd;
struct vr_flow_md *flmd =
(struct vr_flow_md *)arg;
router = flmd->flmd_router;
if (!router)
goto exit_flush;
fe = vr_get_flow_entry(router, flmd->flmd_index);
if (!fe)
goto exit_flush;
vr_init_forwarding_md(&fmd);
vr_flow_set_forwarding_md(router, fe, flmd->flmd_index, &fmd);
vr_flush_entry(router, fe, flmd, &fmd);
if (!(flmd->flmd_flags & VR_FLOW_FLAG_ACTIVE)) {
vr_reset_flow_entry(router, fe, flmd->flmd_index);
}
exit_flush:
if (flmd->flmd_defer_data) {
vr_put_defer_data(flmd->flmd_defer_data);
flmd->flmd_defer_data = NULL;
}
vr_free(flmd);
return;
}
static void
vr_flow_set_mirror(struct vrouter *router, vr_flow_req *req,
struct vr_flow_entry *fe)
{
struct vr_mirror_entry *mirror = NULL, *sec_mirror = NULL;
if (!(req->fr_flags & VR_FLOW_FLAG_MIRROR) &&
(fe->fe_flags & VR_FLOW_FLAG_MIRROR)) {
vr_flow_reset_mirror(router, fe, req->fr_index);
return;
}
if (!(req->fr_flags & VR_FLOW_FLAG_MIRROR))
return;
if (fe->fe_mirror_id != req->fr_mir_id) {
if (fe->fe_mirror_id < router->vr_max_mirror_indices) {
vrouter_put_mirror(router, fe->fe_mirror_id);
fe->fe_mirror_id = router->vr_max_mirror_indices;
}
if ((unsigned int)req->fr_mir_id < router->vr_max_mirror_indices) {
mirror = vrouter_get_mirror(req->fr_rid, req->fr_mir_id);
if (mirror)
fe->fe_mirror_id = req->fr_mir_id;
/* when we reached this point, we had already done all the
* sanity checks we could do. failing here will add only
* complexity to code here. so !mirror case, we will not
* handle
*/
}
}
if (fe->fe_sec_mirror_id != req->fr_sec_mir_id) {
if (fe->fe_sec_mirror_id < router->vr_max_mirror_indices) {
vrouter_put_mirror(router, fe->fe_sec_mirror_id);
fe->fe_sec_mirror_id = router->vr_max_mirror_indices;
}
if ((unsigned int)req->fr_sec_mir_id < router->vr_max_mirror_indices) {
sec_mirror = vrouter_get_mirror(req->fr_rid, req->fr_sec_mir_id);
if (sec_mirror)
fe->fe_sec_mirror_id = req->fr_sec_mir_id;
}
}
if (req->fr_pcap_meta_data_size && req->fr_pcap_meta_data)
vr_mirror_meta_entry_set(router, req->fr_index,
req->fr_mir_sip, req->fr_mir_sport,
req->fr_pcap_meta_data, req->fr_pcap_meta_data_size,
req->fr_mir_vrf);
return;
}
static struct vr_flow_entry *
vr_add_flow(unsigned int rid, struct vr_flow *key, uint8_t type,
bool need_hold_queue, unsigned int *fe_index)
{
struct vr_flow_entry *flow_e;
struct vrouter *router = vrouter_get(rid);
flow_e = vr_find_flow(router, key, type, fe_index);
if (flow_e) {
/* a race between agent and dp. allow agent to handle this error */