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vr_bridge.c
577 lines (467 loc) · 15.8 KB
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vr_bridge.c
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/*
* Copyright (c) 2013 Juniper Networks, Inc. All rights reserved.
*/
#include <vr_os.h>
#include <vr_packet.h>
#include "vr_interface.h"
#include "vr_message.h"
#include "vr_sandesh.h"
#include "vr_bridge.h"
#include "vr_htable.h"
#include "vr_nexthop.h"
#include "vr_datapath.h"
#include "vr_defs.h"
struct vr_bridge_entry_key {
unsigned char be_mac[VR_ETHER_ALEN];
unsigned short be_vrf_id;
}__attribute__((packed));
struct vr_bridge_entry;
struct vr_dummy_bridge_entry {
vr_hentry_t be_hentry;
struct vr_bridge_entry_key be_key;
struct vr_nexthop *be_nh;
uint32_t be_label;
unsigned short be_flags;
} __attribute__((packed));
#define VR_BRIDGE_ENTRY_PACK (64 - sizeof(struct vr_dummy_bridge_entry))
struct vr_bridge_entry {
vr_hentry_t be_hentry;
struct vr_bridge_entry_key be_key;
struct vr_nexthop *be_nh;
uint32_t be_label;
unsigned short be_flags;
unsigned char be_pack[VR_BRIDGE_ENTRY_PACK];
} __attribute__((packed));
unsigned int vr_bridge_entries = VR_DEF_BRIDGE_ENTRIES;
unsigned int vr_bridge_oentries = VR_DEF_BRIDGE_OENTRIES;
static vr_htable_t vn_rtable;
char vr_bcast_mac[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
struct vr_nexthop *(*vr_bridge_lookup)(unsigned int, struct vr_route_req *);
int bridge_table_init(struct vr_rtable *, struct rtable_fspec *);
void bridge_table_deinit(struct vr_rtable *, struct rtable_fspec *, bool);
struct vr_bridge_entry *vr_find_bridge_entry(struct vr_bridge_entry_key *);
struct vr_bridge_entry *vr_find_free_bridge_entry(unsigned int, char *);
extern struct vr_vrf_stats *(*vr_inet_vrf_stats)(unsigned short, unsigned int);
extern l4_pkt_type_t vr_ip_well_known_packet(struct vr_packet *);
extern l4_pkt_type_t vr_ip6_well_known_packet(struct vr_packet *);
bool
vr_unknown_uc_flood(struct vr_interface *ingress_vif,
struct vr_nexthop *ingress_nh)
{
if (!ingress_vif)
return false;
if (vif_is_virtual(ingress_vif)) {
return ((ingress_vif->vif_flags & VIF_FLAG_UNKNOWN_UC_FLOOD) != 0);
} else if (vif_is_fabric(ingress_vif) && ingress_nh) {
return ((ingress_nh->nh_flags & NH_FLAG_UNKNOWN_UC_FLOOD) != 0);
}
return false;
}
struct vr_bridge_entry *
vr_find_bridge_entry(struct vr_bridge_entry_key *key)
{
if (!vn_rtable || !key)
return NULL;
return (struct vr_bridge_entry *)vr_htable_find_hentry(vn_rtable, key, 0);
}
struct vr_bridge_entry *
vr_find_free_bridge_entry(unsigned int vrf_id, char *mac)
{
struct vr_bridge_entry *be;
struct vr_bridge_entry_key key;
if (!vn_rtable || !mac)
return NULL;
key.be_vrf_id = vrf_id;
VR_MAC_COPY(key.be_mac, mac);
be = (struct vr_bridge_entry *)vr_htable_find_free_hentry(vn_rtable,
&key, 0);
return be;
}
static int
__bridge_table_add(struct vr_route_req *rt)
{
struct vr_bridge_entry *be;
struct vr_nexthop *old_nh;
struct vr_bridge_entry_key key;
rt->rtr_req.rtr_label_flags &= ~VR_BE_VALID_FLAG;
VR_MAC_COPY(key.be_mac, rt->rtr_req.rtr_mac);
key.be_vrf_id = rt->rtr_req.rtr_vrf_id;
be = vr_find_bridge_entry(&key);
if (!be) {
be = vr_find_free_bridge_entry(rt->rtr_req.rtr_vrf_id,
(char *)rt->rtr_req.rtr_mac);
if (!be)
return -ENOMEM;
VR_MAC_COPY(be->be_key.be_mac, rt->rtr_req.rtr_mac);
be->be_key.be_vrf_id = rt->rtr_req.rtr_vrf_id;
be->be_flags = VR_BE_VALID_FLAG;
}
if (be->be_nh != rt->rtr_nh) {
/* Un ref the old nexthop */
old_nh = be->be_nh;
be->be_nh = vrouter_get_nexthop(rt->rtr_req.rtr_rid,
rt->rtr_req.rtr_nh_id);
if (old_nh)
vrouter_put_nexthop(old_nh);
}
if (rt->rtr_req.rtr_label_flags & VR_BE_LABEL_VALID_FLAG)
be->be_label = rt->rtr_req.rtr_label;
be->be_flags &= VR_BE_VALID_FLAG;
be->be_flags |= rt->rtr_req.rtr_label_flags;
return 0;
}
static int
bridge_table_add(struct vr_rtable * _unused, struct vr_route_req *rt)
{
int ret;
if (!vn_rtable)
return -EINVAL;
if (IS_MAC_ZERO(rt->rtr_req.rtr_mac))
return -EINVAL;
rt->rtr_nh = vrouter_get_nexthop(rt->rtr_req.rtr_rid,
rt->rtr_req.rtr_nh_id);
if (!rt->rtr_nh)
return -ENOENT;
if ((!(rt->rtr_req.rtr_label_flags & VR_BE_LABEL_VALID_FLAG)) &&
(rt->rtr_nh->nh_type == NH_TUNNEL)) {
vrouter_put_nexthop(rt->rtr_nh);
return -EINVAL;
}
ret = __bridge_table_add(rt);
vrouter_put_nexthop(rt->rtr_nh);
return ret;
}
static void
bridge_table_entry_free(vr_htable_t table, vr_hentry_t *hentry,
unsigned int index, void *data)
{
struct vr_nexthop *nh;
struct vr_bridge_entry *be = (struct vr_bridge_entry *)hentry;
if (!be)
return;
/* Mark this entry as invalid */
be->be_flags &= ~VR_BE_VALID_FLAG;
if (be->be_nh) {
nh = be->be_nh;
be->be_nh = NULL;
vrouter_put_nexthop(nh);
}
vr_htable_release_hentry(table, hentry);
return;
}
static int
bridge_table_delete(struct vr_rtable * _unused, struct vr_route_req *rt)
{
struct vr_bridge_entry_key key;
struct vr_bridge_entry *be;
if (!vn_rtable)
return -EINVAL;
VR_MAC_COPY(key.be_mac, rt->rtr_req.rtr_mac);
key.be_vrf_id = rt->rtr_req.rtr_vrf_id;
be = vr_find_bridge_entry(&key);
if (!be)
return -ENOENT;
bridge_table_entry_free(vn_rtable, (vr_hentry_t *)be, 0, NULL);
return 0;
}
static struct vr_nexthop *
bridge_table_lookup(unsigned int vrf_id, struct vr_route_req *rt)
{
struct vr_bridge_entry *be;
struct vr_bridge_entry_key key;
rt->rtr_req.rtr_label_flags = 0;
if (rt->rtr_req.rtr_index != VR_BE_INVALID_INDEX) {
be = (struct vr_bridge_entry *)
vr_htable_get_hentry_by_index(vn_rtable, rt->rtr_req.rtr_index);
if (!be)
return NULL;
rt->rtr_req.rtr_label_flags = be->be_flags;
rt->rtr_req.rtr_label = be->be_label;
rt->rtr_nh = be->be_nh;
if (rt->rtr_req.rtr_mac)
VR_MAC_COPY(rt->rtr_req.rtr_mac, be->be_key.be_mac);
return rt->rtr_nh;
}
rt->rtr_nh = NULL;
rt->rtr_req.rtr_index = VR_BE_INVALID_INDEX;
VR_MAC_COPY(key.be_mac, rt->rtr_req.rtr_mac);
key.be_vrf_id = rt->rtr_req.rtr_vrf_id;
be = vr_find_bridge_entry(&key);
if (be) {
rt->rtr_req.rtr_label_flags = be->be_flags;
rt->rtr_req.rtr_label = be->be_label;
rt->rtr_nh = be->be_nh;
rt->rtr_req.rtr_index = be->be_hentry.hentry_index;
}
return rt->rtr_nh;
}
unsigned short
vr_bridge_route_flags(unsigned int vrf_id, unsigned char *mac)
{
struct vr_bridge_entry *be;
struct vr_bridge_entry_key key;
VR_MAC_COPY(key.be_mac, mac);
key.be_vrf_id = vrf_id;
be = vr_find_bridge_entry(&key);
if (be && (be->be_flags & VR_BE_VALID_FLAG))
return be->be_flags;
return 0;
}
static int
bridge_table_get(unsigned int vrf_id, struct vr_route_req *rt)
{
struct vr_nexthop *nh;
nh = bridge_table_lookup(vrf_id, rt);
if (nh) {
rt->rtr_req.rtr_nh_id = rt->rtr_nh->nh_id;
return 0;
}
return -ENOENT;
}
static int
bridge_entry_make_req(struct vr_route_req *resp, struct vr_bridge_entry *ent)
{
memset(resp, 0, sizeof(struct vr_route_req));
resp->rtr_req.rtr_mac_size = VR_ETHER_ALEN;
resp->rtr_req.rtr_mac = vr_zalloc(VR_ETHER_ALEN, VR_ROUTE_REQ_MAC_OBJECT);
if (!resp->rtr_req.rtr_mac)
return -ENOMEM;
VR_MAC_COPY(resp->rtr_req.rtr_mac, ent->be_key.be_mac);
resp->rtr_req.rtr_vrf_id = ent->be_key.be_vrf_id;
if (ent->be_nh)
resp->rtr_req.rtr_nh_id = ent->be_nh->nh_id;
resp->rtr_req.rtr_family = AF_BRIDGE;
resp->rtr_req.rtr_label = ent->be_label;
resp->rtr_req.rtr_label_flags = ent->be_flags;
resp->rtr_req.rtr_index = ent->be_hentry.hentry_index;
return 0;
}
static void
bridge_entry_req_destroy(struct vr_route_req *resp)
{
if (resp->rtr_req.rtr_mac)
vr_free(resp->rtr_req.rtr_mac, VR_ROUTE_REQ_MAC_OBJECT);
}
static int
__bridge_table_dump(struct vr_message_dumper *dumper)
{
struct vr_route_req *req = (struct vr_route_req *)(dumper->dump_req);
struct vr_route_req resp;
int ret;
unsigned int i;
struct vr_bridge_entry *be;
for(i = 0; i < (vr_bridge_entries + vr_bridge_oentries); i++) {
be = (struct vr_bridge_entry *)
vr_htable_get_hentry_by_index(vn_rtable, i);
if (!be)
continue;
if (be->be_flags & VR_BE_VALID_FLAG) {
if (be->be_key.be_vrf_id != req->rtr_req.rtr_vrf_id)
continue;
if (dumper->dump_been_to_marker == 0) {
if (VR_MAC_CMP(be->be_key.be_mac, req->rtr_req.rtr_mac)
&& (be->be_key.be_vrf_id == req->rtr_req.rtr_vrf_id)) {
dumper->dump_been_to_marker = 1;
}
} else {
if (!bridge_entry_make_req(&resp, be)) {
ret = vr_message_dump_object(dumper, VR_ROUTE_OBJECT_ID, &resp);
bridge_entry_req_destroy(&resp);
if (ret <= 0) {
return ret;
}
}
}
}
}
return 0;
}
static int
bridge_table_dump(struct vr_rtable * __unsued, struct vr_route_req *rt)
{
int ret = 0;
struct vr_message_dumper *dumper;
char *mac;
dumper = vr_message_dump_init(&rt->rtr_req);
if (!dumper) {
ret = -ENOMEM;
goto generate_response;
}
mac = (char *)(((vr_route_req *)(dumper->dump_req))->rtr_mac);
if (!mac) {
ret = -EINVAL;
goto generate_response;
}
if (IS_MAC_ZERO(mac))
dumper->dump_been_to_marker = 1;
ret = __bridge_table_dump(dumper);
generate_response:
vr_message_dump_exit(dumper, ret);
return 0;
}
vr_hentry_key
bridge_entry_key(vr_htable_t table, vr_hentry_t *entry, unsigned int
*key_len)
{
struct vr_bridge_entry *be = CONTAINER_OF(be_hentry,
struct vr_bridge_entry, entry);
if (!entry || (!(be->be_flags & VR_BE_VALID_FLAG)))
return NULL;
if (key_len)
*key_len = sizeof(be->be_key);
return &be->be_key;
}
int
bridge_table_init(struct vr_rtable *rtable, struct rtable_fspec *fs)
{
/* If table already exists, dont create again */
if (rtable->algo_data)
return 0;
rtable->algo_data = vr_htable_create(vrouter_get(0), vr_bridge_entries,
vr_bridge_oentries, sizeof(struct vr_bridge_entry),
sizeof(struct vr_bridge_entry_key), 0, bridge_entry_key);
if (!rtable->algo_data)
return vr_module_error(-ENOMEM, __FUNCTION__, __LINE__,
vr_bridge_entries);
/* Max VRF's does not matter as Bridge table is not per VRF. But
* still this can be maintained in table
*/
rtable->algo_max_vrfs = fs->rtb_max_vrfs;
rtable->algo_add = bridge_table_add;
rtable->algo_del = bridge_table_delete;
rtable->algo_lookup = bridge_table_lookup;
rtable->algo_get = bridge_table_get;
rtable->algo_dump = bridge_table_dump;
vr_bridge_lookup = bridge_table_lookup;
vn_rtable = rtable->algo_data;
return 0;
}
void
bridge_table_deinit(struct vr_rtable *rtable, struct rtable_fspec *fs,
bool soft_reset)
{
if (!vn_rtable)
return;
vr_htable_trav(vn_rtable, 0, bridge_table_entry_free, NULL);
if (!soft_reset) {
vr_htable_delete(vn_rtable);
rtable->algo_data = NULL;
vn_rtable = NULL;
}
}
unsigned int
vr_bridge_input(struct vrouter *router, struct vr_packet *pkt,
struct vr_forwarding_md *fmd)
{
struct vr_route_req rt;
struct vr_forwarding_md cmd;
struct vr_nexthop *nh = NULL;
unsigned short pull_len, overlay_len = VROUTER_OVERLAY_LEN;
int reason, handled;
struct vr_vrf_stats *stats;
l4_pkt_type_t l4_type = L4_TYPE_UNKNOWN;
int8_t *dmac;
dmac = (int8_t *) pkt_data(pkt);
pull_len = 0;
if ((pkt->vp_type == VP_TYPE_IP) || (pkt->vp_type == VP_TYPE_IP6)) {
pull_len = pkt_get_network_header_off(pkt) - pkt_head_space(pkt);
if (pull_len && !pkt_pull(pkt, pull_len)) {
vr_pfree(pkt, VP_DROP_PULL);
return 0;
}
}
if (fmd->fmd_dscp < 0) {
if (pkt->vp_type == VP_TYPE_IP) {
fmd->fmd_dscp =
vr_inet_get_tos((struct vr_ip *)pkt_network_header(pkt));
} else if (pkt->vp_type == VP_TYPE_IP6) {
fmd->fmd_dscp =
vr_inet6_get_tos((struct vr_ip6 *)pkt_network_header(pkt));
}
}
/* Do the bridge lookup for the packets not meant for "me" */
if (!fmd->fmd_to_me) {
/*
* If DHCP packet coming from VM, Trap it to Agent before doing the bridge
* lookup itself
*/
if (vif_is_virtual(pkt->vp_if)) {
if (pkt->vp_type == VP_TYPE_IP)
l4_type = vr_ip_well_known_packet(pkt);
else if (pkt->vp_type == VP_TYPE_IP6)
l4_type = vr_ip6_well_known_packet(pkt);
if (l4_type == L4_TYPE_DHCP_REQUEST) {
if (pkt->vp_if->vif_flags & VIF_FLAG_DHCP_ENABLED) {
vr_trap(pkt, fmd->fmd_dvrf, AGENT_TRAP_L3_PROTOCOLS, NULL);
return 0;
}
}
}
rt.rtr_req.rtr_label_flags = 0;
rt.rtr_req.rtr_index = VR_BE_INVALID_INDEX;
rt.rtr_req.rtr_mac_size = VR_ETHER_ALEN;
rt.rtr_req.rtr_mac = dmac;
/* If multicast L2 packet, use broadcast composite nexthop */
if (IS_MAC_BMCAST(rt.rtr_req.rtr_mac))
rt.rtr_req.rtr_mac = (int8_t *)vr_bcast_mac;
rt.rtr_req.rtr_vrf_id = fmd->fmd_dvrf;
nh = vr_bridge_lookup(fmd->fmd_dvrf, &rt);
if (!nh || nh->nh_type == NH_DISCARD) {
/* If Flooding of unknown unicast not allowed, drop the packet */
if (!vr_unknown_uc_flood(pkt->vp_if, pkt->vp_nh) ||
IS_MAC_BMCAST(rt.rtr_req.rtr_mac)) {
vr_pfree(pkt, VP_DROP_L2_NO_ROUTE);
return 0;
}
rt.rtr_req.rtr_mac = (int8_t *)vr_bcast_mac;
rt.rtr_req.rtr_index = VR_BE_INVALID_INDEX;
nh = vr_bridge_lookup(fmd->fmd_dvrf, &rt);
if (!nh) {
vr_pfree(pkt, VP_DROP_L2_NO_ROUTE);
return 0;
}
stats = vr_inet_vrf_stats(fmd->fmd_dvrf, pkt->vp_cpu);
if (stats)
stats->vrf_uuc_floods++;
/* Treat this unknown unicast packet as multicast */
pkt->vp_flags |= VP_FLAG_MULTICAST;
}
if (nh->nh_type != NH_L2_RCV)
overlay_len = VROUTER_L2_OVERLAY_LEN;
}
/* Adjust MSS for V4 and V6 packets */
if ((pkt->vp_type == VP_TYPE_IP) || (pkt->vp_type == VP_TYPE_IP6)) {
if (vif_is_virtual(pkt->vp_if) &&
vr_from_vm_mss_adj && vr_pkt_from_vm_tcp_mss_adj) {
if ((reason = vr_pkt_from_vm_tcp_mss_adj(pkt, overlay_len))) {
vr_pfree(pkt, reason);
return 0;
}
}
if (fmd->fmd_to_me) {
handled = vr_l3_input(pkt, fmd);
if (!handled) {
vr_pfree(pkt, VP_DROP_NOWHERE_TO_GO);
}
return 0;
}
}
/*
* If there is a label attached to this bridge entry add the
* label
*/
if (rt.rtr_req.rtr_label_flags & VR_BE_LABEL_VALID_FLAG) {
if (!fmd) {
vr_init_forwarding_md(&cmd);
fmd = &cmd;
}
vr_forwarding_md_set_label(fmd, rt.rtr_req.rtr_label,
VR_LABEL_TYPE_UNKNOWN);
}
if (pull_len && !pkt_push(pkt, pull_len)) {
vr_pfree(pkt, VP_DROP_PUSH);
return 0;
}
nh_output(pkt, nh, fmd);
return 0;
}