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vr_nexthop.c
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vr_nexthop.c
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/*
* vr_nexthop.c -- data path nexthop management
*
* Copyright (c) 2013 Juniper Networks, Inc. All rights reserved.
*/
#include <vr_os.h>
#include <vr_types.h>
#include <vr_packet.h>
#include <vr_interface.h>
#include <vr_nexthop.h>
#include <vr_vxlan.h>
#include "vr_message.h"
#include "vr_sandesh.h"
#include "vr_bridge.h"
#include "vr_btable.h"
#include "vr_datapath.h"
#include "vr_route.h"
#include "vr_hash.h"
extern bool vr_has_to_fragment(struct vr_interface *, struct vr_packet *,
unsigned int);
extern struct vr_vrf_stats *(*vr_inet_vrf_stats)(unsigned short, unsigned int);
extern struct vr_nexthop *vr_inet6_ip_lookup(unsigned short, uint8_t *);
extern struct vr_nexthop *vr_inet_ip_lookup(unsigned short, uint32_t);
extern struct vr_nexthop *vr_inet_src_lookup(unsigned short,
struct vr_packet *);
extern l4_pkt_type_t vr_ip6_well_known_packet(struct vr_packet *);
extern l4_pkt_type_t vr_ip_well_known_packet(struct vr_packet *);
struct vr_nexthop *ip4_default_nh;
struct vr_nexthop *ip6_default_nh;
unsigned int vr_nexthops = VR_DEF_NEXTHOPS;
struct vr_nexthop *
__vrouter_get_nexthop(struct vrouter *router, unsigned int index)
{
if (!router || index >= router->vr_max_nexthops)
return NULL;
return *(struct vr_nexthop **)vr_btable_get(router->vr_nexthops, index);
}
struct vr_nexthop *
vrouter_get_nexthop(unsigned int rid, unsigned int index)
{
struct vr_nexthop *nh;
struct vrouter *router;
router = vrouter_get(rid);
nh = __vrouter_get_nexthop(router, index);
if (nh)
nh->nh_users++;
return nh;
}
static int
__vrouter_set_nexthop(struct vrouter *router, unsigned int index,
struct vr_nexthop *nh)
{
struct vr_nexthop **nh_p;
nh_p = (struct vr_nexthop **)vr_btable_get(router->vr_nexthops, index);
if (!nh_p)
return -EINVAL;
*nh_p = nh;
return 0;
}
static void
vrouter_free_nexthop(struct vr_nexthop *nh)
{
if (nh->nh_type == NH_COMPOSITE) {
if (nh->nh_component_nh) {
vr_free(nh->nh_component_nh, VR_NEXTHOP_COMPONENT_OBJECT);
nh->nh_component_nh = NULL;
}
if (nh->nh_component_ecmp) {
nh->nh_component_ecmp_cnt = 0;
vr_free(nh->nh_component_ecmp, VR_NEXTHOP_COMPONENT_OBJECT);
nh->nh_component_ecmp = NULL;
}
} else if ((nh->nh_type == NH_TUNNEL) &&
(nh->nh_flags & NH_FLAG_TUNNEL_UDP) &&
(nh->nh_family == AF_INET6)) {
if (nh->nh_udp_tun6_sip) {
vr_free(nh->nh_udp_tun6_sip, VR_NETWORK_ADDRESS_OBJECT);
nh->nh_udp_tun6_sip = NULL;
}
if (nh->nh_udp_tun6_dip) {
vr_free(nh->nh_udp_tun6_dip, VR_NETWORK_ADDRESS_OBJECT);
nh->nh_udp_tun6_dip = NULL;
}
}
if (nh->nh_dev) {
vrouter_put_interface(nh->nh_dev);
}
vr_free(nh, VR_NEXTHOP_OBJECT);
return;
}
static void
vrouter_free_nexthop_cb(struct vrouter *router, void *data)
{
struct vr_defer_data *vdd = (struct vr_defer_data *)data;
if (!vdd)
return;
vrouter_free_nexthop((struct vr_nexthop *)vdd->vdd_data);
return;
}
static int
vrouter_free_nexthop_defer(struct vr_nexthop *nh)
{
struct vr_defer_data *defer;
defer = vr_get_defer_data(sizeof(*defer));
if (!defer)
return -ENOMEM;
defer->vdd_data = nh;
vr_defer(nh->nh_router, vrouter_free_nexthop_cb, (void *)defer);
return 0;
}
void
vrouter_put_nexthop(struct vr_nexthop *nh)
{
int i, component_cnt;
struct vr_nexthop *cnh;
unsigned int ref_cnt;
if (!nh)
return;
/* This function might get invoked with zero ref_cnt */
ref_cnt = nh->nh_users;
if (ref_cnt) {
ref_cnt = __sync_sub_and_fetch(&nh->nh_users, 1);
}
if (!ref_cnt ) {
/* If composite de-ref the internal nexthops */
if (nh->nh_type == NH_COMPOSITE) {
component_cnt = nh->nh_component_cnt;
nh->nh_component_cnt = 0;
for (i = 0; i < component_cnt; i++) {
if (nh->nh_component_nh[i].cnh) {
cnh = nh->nh_component_nh[i].cnh;
nh->nh_component_nh[i].cnh = NULL;
vrouter_put_nexthop(cnh);
}
}
}
if (vr_not_ready) {
vrouter_free_nexthop(nh);
} else {
if (vrouter_free_nexthop_defer(nh)) {
vr_delay_op();
vrouter_free_nexthop(nh);
}
}
}
return;
}
static int
vrouter_add_nexthop(struct vr_nexthop *nh)
{
struct vrouter *router = vrouter_get(nh->nh_rid);
if (!router || nh->nh_id >= router->vr_max_nexthops)
return -EINVAL;
/*
* NH change just copies the field
* over to nexthop, incase of change
* just return
*/
if (__vrouter_get_nexthop(router, nh->nh_id))
return 0;
nh->nh_users++;
return __vrouter_set_nexthop(router, nh->nh_id, nh);
}
static void
nh_del(struct vr_nexthop *nh)
{
struct vrouter *router = vrouter_get(nh->nh_rid);
if (!router || nh->nh_id >= router->vr_max_nexthops)
return;
__vrouter_set_nexthop(router, nh->nh_id, NULL);
vrouter_put_nexthop(nh);
return;
}
bool
vr_gateway_nexthop(struct vr_nexthop *nh)
{
if (nh) {
if (!nh->nh_dev)
return false;
if ((nh->nh_type == NH_ENCAP) &&
(nh->nh_dev->vif_type == VIF_TYPE_AGENT))
return true;
}
return false;
}
static int
nh_resolve(struct vr_packet *pkt, struct vr_nexthop *nh,
struct vr_forwarding_md *fmd)
{
struct vr_vrf_stats *stats;
struct vr_packet *pkt_clone;
stats = vr_inet_vrf_stats(fmd->fmd_dvrf, pkt->vp_cpu);
if (stats)
stats->vrf_resolves++;
if (pkt->vp_if->vif_bridge) {
/*
* bridge is set only for vhost/physical interface, and this
* path will be hit only for packets from vhost, in which case
* we already know everything that has to be known i.e. we know
* the outgoing device and the mac address (which was already
* resolved as part of the arp request from host
*/
pkt_clone = vr_pclone(pkt);
if (pkt_clone) {
vr_preset(pkt_clone);
vif_xconnect(pkt->vp_if, pkt_clone, fmd);
}
}
/* will trap the packet to agent to create a route */
vr_trap(pkt, fmd->fmd_dvrf, AGENT_TRAP_RESOLVE, NULL);
return 0;
}
static int
nh_vrf_translate(struct vr_packet *pkt, struct vr_nexthop *nh,
struct vr_forwarding_md *fmd)
{
struct vr_vrf_stats *stats;
stats = vr_inet_vrf_stats(nh->nh_vrf, pkt->vp_cpu);
if (stats)
stats->vrf_vrf_translates++;
fmd->fmd_dvrf = nh->nh_vrf;
if (!(nh->nh_flags & NH_FLAG_VNID))
return vr_forward(nh->nh_router, pkt, fmd);
return vr_bridge_input(nh->nh_router, pkt, fmd);
}
static int
nh_l2_rcv(struct vr_packet *pkt, struct vr_nexthop *nh,
struct vr_forwarding_md *fmd)
{
unsigned char eth_dmac[VR_ETHER_ALEN], *data;
int pull_len, handled = 0;
struct vr_vrf_stats *stats;
stats = vr_inet_vrf_stats(fmd->fmd_dvrf, pkt->vp_cpu);
if (stats)
stats->vrf_l2_receives++;
data = pkt_data(pkt);
fmd->fmd_to_me = 1;
pull_len = pkt_get_network_header_off(pkt) - pkt_head_space(pkt);
if (pkt_pull(pkt, pull_len) < 0) {
vr_pfree(pkt, VP_DROP_PULL);
return 0;
}
/*
* there should not be any unicast ARP requests destined to "my mac".
* The ARP response destined to "my mac" incase of ARP request being
* generated by Agent for some features
*/
if (pkt->vp_type == VP_TYPE_IP6) {
VR_MAC_COPY(eth_dmac, data);
handled = vr_neighbor_input(pkt, fmd, eth_dmac);
if (!handled)
handled = vr_l3_input(pkt, fmd);
} else if (pkt->vp_type == VP_TYPE_IP) {
handled = vr_l3_input(pkt, fmd);
} else if (pkt->vp_type == VP_TYPE_ARP) {
VR_MAC_COPY(eth_dmac, data);
handled = vr_arp_input(pkt, fmd, eth_dmac);
}
if (!handled)
vr_pfree(pkt, VP_DROP_INVALID_PROTOCOL);
return 0;
}
static int
nh_l3_rcv(struct vr_packet *pkt, struct vr_nexthop *nh,
struct vr_forwarding_md *fmd)
{
struct vr_vrf_stats *stats;
stats = vr_inet_vrf_stats(fmd->fmd_dvrf, pkt->vp_cpu);
if (stats)
stats->vrf_receives++;
if (nh->nh_family == AF_INET)
return vr_ip_rcv(nh->nh_router, pkt, fmd);
else
vr_pfree(pkt, VP_DROP_INVALID_PROTOCOL);
return 0;
}
static int
nh_push_mpls_header(struct vr_packet *pkt, unsigned int label,
struct vr_forwarding_class_qos *qos)
{
uint32_t exp_qos = 0;
unsigned int *lbl;
unsigned int ttl;
lbl = (unsigned int *)pkt_push(pkt, sizeof(unsigned int));
if (!lbl)
return -ENOSPC;
/* Use the ttl from packet. If not ttl,
* initialise to some arbitrary value */
ttl = pkt->vp_ttl;
if (!ttl) {
ttl = 64;
}
if (qos) {
exp_qos = qos->vfcq_mpls_qos;
exp_qos <<= VR_MPLS_EXP_QOS_SHIFT;
}
*lbl = htonl((label << VR_MPLS_LABEL_SHIFT) | exp_qos |
VR_MPLS_STACK_BIT | ttl);
return 0;
}
/*
* nh_udp_tunnel_helper - helper function to use for UDP tunneling. Used
* by mirroring and MPLS over UDP. Returns true on success, false otherwise.
*/
static bool
nh_udp_tunnel_helper(struct vr_packet *pkt, unsigned short sport,
unsigned short dport, unsigned int sip,
unsigned int dip, struct vr_forwarding_class_qos *qos)
{
struct vr_ip *ip;
struct vr_udp *udp;
/* Udp Header */
udp = (struct vr_udp *)pkt_push(pkt, sizeof(struct vr_udp));
if (!udp) {
return false;
}
udp->udp_sport = sport;
udp->udp_dport = dport;
udp->udp_length = htons(pkt_len(pkt));
udp->udp_csum = 0;
/* And now the IP header */
ip = (struct vr_ip *)pkt_push(pkt, sizeof(struct vr_ip));
if (!ip) {
return false;
}
ip->ip_version = 4;
ip->ip_hl = 5;
if (qos) {
ip->ip_tos = VR_IP_DSCP(qos->vfcq_dscp);
pkt->vp_queue = qos->vfcq_queue_id;
pkt->vp_priority = qos->vfcq_dotonep_qos;
} else {
ip->ip_tos = 0;
}
ip->ip_id = htons(vr_generate_unique_ip_id());
ip->ip_frag_off = 0;
if (vr_pkt_is_diag(pkt)) {
ip->ip_ttl = pkt->vp_ttl;
} else {
ip->ip_ttl = 64;
}
ip->ip_proto = VR_IP_PROTO_UDP;
ip->ip_saddr = sip;
ip->ip_daddr = dip;
ip->ip_len = htons(pkt_len(pkt));
/*
* header checksum
*/
ip->ip_csum = 0;
ip->ip_csum = vr_ip_csum(ip);
return true;
}
static bool
nh_udp_tunnel6_helper(struct vr_packet *pkt,
struct vr_nexthop *nh, uint16_t sport, uint16_t dport)
{
unsigned int v4_ip;
uint8_t *sip = NULL;
uint8_t sip6[VR_IP6_ADDRESS_LEN];
struct vr_ip6 *ip6;
struct vr_ip *ip;
struct vr_udp *udp;
if (nh->nh_flags & NH_FLAG_TUNNEL_SIP_COPY) {
if (pkt->vp_type == VP_TYPE_IP6) {
ip6 = (struct vr_ip6 *)pkt_network_header(pkt);
if (pkt->vp_if->vif_type == VIF_TYPE_PHYSICAL)
sip = ip6->ip6_dst;
sip = ip6->ip6_src;
} else if (pkt->vp_type == VP_TYPE_IP) {
ip = (struct vr_ip *)pkt_network_header(pkt);
v4_ip = ip->ip_saddr;
if (pkt->vp_if->vif_type == VIF_TYPE_PHYSICAL)
v4_ip = ip->ip_daddr;
vr_inet6_generate_ip6(sip6, v4_ip);
sip = sip6;
}
}
/* udp Header */
udp = (struct vr_udp *)pkt_push(pkt, sizeof(struct vr_udp));
if (!udp) {
return false;
}
udp->udp_sport = sport;
udp->udp_dport = dport;
udp->udp_length = htons(pkt_len(pkt));
udp->udp_csum = 0;
/* And now the IP6 header */
ip6 = (struct vr_ip6 *)pkt_push(pkt, sizeof(struct vr_ip6));
if (!ip6) {
return false;
}
ip6->ip6_version = 6;
ip6->ip6_priority_l = 0;
ip6->ip6_priority_h = 0;
ip6->ip6_flow_l = 0;
ip6->ip6_flow_h = 0;
ip6->ip6_plen = htons(pkt_len(pkt) - sizeof(struct vr_ip6));
ip6->ip6_nxt = VR_IP_PROTO_UDP;
ip6->ip6_hlim = 64;
if (!sip)
sip = nh->nh_udp_tun6_sip;
memcpy(ip6->ip6_src, sip, VR_IP6_ADDRESS_LEN);
memcpy(ip6->ip6_dst, nh->nh_udp_tun6_dip, VR_IP6_ADDRESS_LEN);
return true;
}
static bool
nh_vxlan_tunnel_helper(struct vrouter *router, struct vr_packet *pkt,
struct vr_forwarding_md *fmd, unsigned int sip, unsigned int dip)
{
unsigned short udp_src_port = VR_VXLAN_UDP_SRC_PORT;
struct vr_vxlan *vxlanh;
struct vr_packet *tmp_pkt;
struct vr_forwarding_class_qos *qos;
if (pkt_head_space(pkt) < VR_VXLAN_HDR_LEN) {
tmp_pkt = vr_pexpand_head(pkt, VR_VXLAN_HDR_LEN - pkt_head_space(pkt));
if (!tmp_pkt) {
return false;
}
pkt = tmp_pkt;
}
if (fmd->fmd_udp_src_port)
udp_src_port = fmd->fmd_udp_src_port;
/*
* The UDP source port is a hash of the inner headers
*/
if ((!fmd->fmd_udp_src_port) && vr_get_udp_src_port) {
udp_src_port = vr_get_udp_src_port(pkt, fmd, fmd->fmd_dvrf);
if (udp_src_port == 0) {
return false;
}
}
vr_forwarding_md_update_label_type(fmd, VR_LABEL_TYPE_VXLAN_ID);
/* Add the vxlan header */
vxlanh = (struct vr_vxlan *)pkt_push(pkt, sizeof(struct vr_vxlan));
vxlanh->vxlan_vnid = htonl(fmd->fmd_label << VR_VXLAN_VNID_SHIFT);
vxlanh->vxlan_flags = htonl(VR_VXLAN_IBIT);
qos = vr_qos_get_forwarding_class(router, pkt, fmd);
return nh_udp_tunnel_helper(pkt, htons(udp_src_port),
htons(VR_VXLAN_UDP_DST_PORT), sip, dip, qos);
}
static struct vr_packet *
nh_mcast_clone(struct vr_packet *pkt, unsigned short head_room)
{
struct vr_packet *clone_pkt;
/* Clone the packet */
clone_pkt = vr_pclone(pkt);
if (!clone_pkt) {
return NULL;
}
/* Increase the head space by the head_room */
if (vr_pcow(clone_pkt, head_room)) {
vr_pfree(clone_pkt, VP_DROP_PCOW_FAIL);
return NULL;
}
/* Copy the ttl from old packet */
clone_pkt->vp_ttl = pkt->vp_ttl;
return clone_pkt;
}
static int
nh_composite_ecmp_validate_src(struct vr_packet *pkt, struct vr_nexthop *nh,
struct vr_forwarding_md *fmd, void *ret_data)
{
int i;
struct vr_nexthop *cnh = NULL;
/* the first few checks are straight forward */
if (!fmd)
return NH_SOURCE_INVALID;
if ((fmd->fmd_ecmp_src_nh_index >= 0) &&
(fmd->fmd_ecmp_src_nh_index < nh->nh_component_cnt)) {
cnh = nh->nh_component_nh[fmd->fmd_ecmp_src_nh_index].cnh;
}
/*
* when the 'supposed' source goes down, cnh is null, in which
* case validate the source against other present nexthops. follow
* the same logic if the component validate source returns invalid
* source, which could mean that source has moved
*/
if (!cnh || (!cnh->nh_validate_src) ||
(NH_SOURCE_INVALID == cnh->nh_validate_src(pkt, cnh, fmd, NULL))) {
for (i = 0; i < nh->nh_component_cnt; i++) {
if (i == fmd->fmd_ecmp_src_nh_index)
continue;
cnh = nh->nh_component_nh[i].cnh;
/* If direct nexthop is not valid, dont process it */
if (!cnh || !(cnh->nh_flags & NH_FLAG_VALID) ||
!cnh->nh_validate_src)
continue;
/*
* if the source has moved to a present and valid source,
* return mismatch
*/
if ((NH_SOURCE_VALID ==
cnh->nh_validate_src(pkt, cnh, fmd, NULL))) {
if (ret_data) {
*(unsigned int *)ret_data = i;
}
return NH_SOURCE_MISMATCH;
}
}
/* if everything else fails, source is indeed invalid */
return NH_SOURCE_INVALID;
}
/* source is validated by validate_src */
return NH_SOURCE_VALID;
}
/*
* nh_ecmp_config_hash is two byte value. The configurable hash as such is
* 5 bit field. We store agent added configurable hash values in the first
* byte and convert them to Flow flags and store them in second byte
*/
static void
nh_ecmp_store_ecmp_config_hash(vr_nexthop_req *req, struct vr_nexthop *nh)
{
unsigned char hash;
unsigned short flow_hash;
int i;
if (!nh || (nh->nh_type != NH_COMPOSITE) ||
(!(nh->nh_flags & NH_FLAG_COMPOSITE_ECMP))) {
return;
}
if (!req || !req->nhr_ecmp_config_hash) {
nh->nh_ecmp_config_hash = ((VR_FLOW_KEY_ALL << 8) & 0xFF00);
return;
}
flow_hash = 0;
hash = req->nhr_ecmp_config_hash & NH_ECMP_CONFIG_HASH_MASK;
for (i = 0; i < NH_ECMP_CONFIG_HASH_BITS; i++) {
switch (hash & (1 << i)) {
case NH_ECMP_CONFIG_HASH_PROTO:
flow_hash |= VR_FLOW_KEY_PROTO;
break;
case NH_ECMP_CONFIG_HASH_SRC_IP:
flow_hash |= VR_FLOW_KEY_SRC_IP;
break;
case NH_ECMP_CONFIG_HASH_SRC_PORT:
flow_hash |= VR_FLOW_KEY_SRC_PORT;
break;
case NH_ECMP_CONFIG_HASH_DST_IP:
flow_hash |= VR_FLOW_KEY_DST_IP;
break;
case NH_ECMP_CONFIG_HASH_DST_PORT:
flow_hash |= VR_FLOW_KEY_DST_PORT;
break;
default:
break;
}
}
/* In the nh, store flow hash values in the second byte */
nh->nh_ecmp_config_hash = hash | ((flow_hash << 8) & 0xFF00);
return;
}
static int
nh_composite_ecmp_select_nh(struct vr_packet *pkt, struct vr_nexthop *nh,
struct vr_forwarding_md *fmd)
{
int ret = -1, ecmp_index;
unsigned int hash, hash_ecmp, count;
struct vr_flow flow, *flowp = &flow;
struct vr_flow_entry *fe = NULL;
struct vr_ip6 *ip6;
struct vr_nexthop *cnh = NULL;
struct vr_component_nh *cnhp = nh->nh_component_nh;
if (!nh || !fmd || (!nh->nh_component_cnt))
return ret;
count = nh->nh_component_cnt;
if (fmd->fmd_flow_index >= 0) {
fe = vr_flow_get_entry(nh->nh_router, fmd->fmd_flow_index);
if (fe)
flowp = &fe->fe_key;
}
if (!fe) {
/*
* If the flow entry does not exist, apply the configured
* hash parameters to select candidate nexthop
*/
hash = (nh->nh_ecmp_config_hash >> 8) & NH_ECMP_CONFIG_HASH_MASK;
if (pkt->vp_type == VP_TYPE_IP) {
ret = vr_inet_get_flow_key(nh->nh_router, pkt, fmd, flowp, hash);
if (ret < 0)
return ret;
} else if (pkt->vp_type == VP_TYPE_IP6) {
ip6 = (struct vr_ip6 *)pkt_network_header(pkt);
ret = vr_inet6_form_flow(nh->nh_router, fmd->fmd_dvrf, pkt,
fmd->fmd_vlan, ip6, flowp, hash);
if (ret < 0)
return ret;
} else {
return ret;
}
}
hash = hash_ecmp = vr_hash(flowp, flowp->flow_key_len, 0);
hash %= count;
ecmp_index = cnhp[hash].cnh_ecmp_index;
cnh = cnhp[hash].cnh;
if (!cnh) {
if (nh->nh_component_ecmp_cnt) {
cnhp = nh->nh_component_ecmp;
hash_ecmp %= nh->nh_component_ecmp_cnt;
ecmp_index = cnhp[hash_ecmp].cnh_ecmp_index;
if (!(cnh = cnhp[hash_ecmp].cnh))
return -1;
}
}
if (fe)
return vr_flow_update_ecmp_index(nh->nh_router, fe, ecmp_index, fmd);
fmd->fmd_ecmp_nh_index = ecmp_index;
return 0;
}
static int
nh_composite_ecmp(struct vr_packet *pkt, struct vr_nexthop *nh,
struct vr_forwarding_md *fmd)
{
int ret = 0, drop_reason = VP_DROP_INVALID_NH;
struct vr_nexthop *member_nh = NULL;
struct vr_vrf_stats *stats;
stats = vr_inet_vrf_stats(fmd->fmd_dvrf, pkt->vp_cpu);
if (stats)
stats->vrf_ecmp_composites++;
if (!fmd) {
drop_reason = VP_DROP_NO_FMD;
goto drop;
}
if ((fmd->fmd_ecmp_nh_index >= 0) &&
(fmd->fmd_ecmp_nh_index < nh->nh_component_cnt)) {
member_nh = nh->nh_component_nh[fmd->fmd_ecmp_nh_index].cnh;
}
if (!member_nh) {
ret = nh_composite_ecmp_select_nh(pkt, nh, fmd);
if (ret)
goto drop;
member_nh = nh->nh_component_nh[fmd->fmd_ecmp_nh_index].cnh;
if (!member_nh)
goto drop;
}
vr_forwarding_md_set_label(fmd,
nh->nh_component_nh[fmd->fmd_ecmp_nh_index].cnh_label,
VR_LABEL_TYPE_UNKNOWN);
return nh_output(pkt, member_nh, fmd);
drop:
vr_pfree(pkt, drop_reason);
return ret;
}
/*
* This function validate the source of the tunnel incase of L2
* multicast
*/
static int
nh_composite_mcast_validate_src(struct vr_packet *pkt, struct vr_nexthop *nh,
struct vr_forwarding_md *fmd, void *ret_flags)
{
int i, j;
struct vr_nexthop *dir_nh, *fabric_nh;
unsigned int tun_dip;
/*
* If multicast packet is received on fabric interface, we need to
* validate whether the source of this packet is in the distribution
* tree. If source is not in the list, packet needs to be dropped.
*/
/* Valid if source is VM */
if (pkt->vp_if->vif_type != VIF_TYPE_PHYSICAL)
return NH_SOURCE_VALID;
/* If there is no source IP to compare treat it as invalid source */
if (!fmd->fmd_outer_src_ip)
return NH_SOURCE_INVALID;
for(j = 0; j < nh->nh_component_cnt; j++) {
fabric_nh = nh->nh_component_nh[j].cnh;
if (!fabric_nh || !(fabric_nh->nh_flags & NH_FLAG_VALID))
continue;
if (fabric_nh->nh_type != NH_COMPOSITE ||
!(fabric_nh->nh_flags & (NH_FLAG_COMPOSITE_FABRIC |
NH_FLAG_COMPOSITE_EVPN | NH_FLAG_COMPOSITE_TOR)))
continue;
for (i = 0; i < fabric_nh->nh_component_cnt; i++) {
dir_nh = fabric_nh->nh_component_nh[i].cnh;
/* If direct nexthop is not valid, dont process it */
if ((!dir_nh) || !(dir_nh->nh_flags & NH_FLAG_VALID))
continue;
if (dir_nh->nh_type != NH_TUNNEL)
continue;
tun_dip = 0;
if (dir_nh->nh_flags & NH_FLAG_TUNNEL_GRE)
tun_dip = dir_nh->nh_gre_tun_dip;
else if (dir_nh->nh_flags &
(NH_FLAG_TUNNEL_UDP_MPLS | NH_FLAG_TUNNEL_VXLAN))
tun_dip = dir_nh->nh_udp_tun_dip;
/* If source is in districution tree, it is valid */
if (tun_dip && fmd->fmd_outer_src_ip &&
fmd->fmd_outer_src_ip == tun_dip) {
if (ret_flags)
*((unsigned int *)ret_flags) = fabric_nh->nh_flags;
return NH_SOURCE_VALID;
}
}
}
return NH_SOURCE_INVALID;
}
static int
nh_handle_mcast_control_pkt(struct vr_packet *pkt, struct vr_eth *eth,
struct vr_forwarding_md *fmd, unsigned int pkt_src, bool *flood_to_vms)
{
int handled = 1;
unsigned char eth_dmac[VR_ETHER_ALEN];
bool flood = false;
unsigned short trap, rt_flags, drop_reason, pull_len = 0;
l4_pkt_type_t l4_type = L4_TYPE_UNKNOWN;
struct vr_arp *sarp;
struct vr_nexthop *src_nh;
struct vr_ip6 *ip6;
struct vr_packet *pkt_c = NULL;
/*
* The vlan tagged packets are meant to be handled only by VM's
*/
if (fmd->fmd_vlan != VLAN_ID_INVALID)
return !handled;
pull_len = pkt_get_network_header_off(pkt) - pkt_head_space(pkt);
if (pkt_pull(pkt, pull_len) < 0) {
drop_reason = VP_DROP_PULL;
goto drop;
}
if (pkt->vp_type == VP_TYPE_ARP) {
VR_MAC_COPY(eth_dmac, eth->eth_dmac);
handled = vr_arp_input(pkt, fmd, eth_dmac);
if (handled)
return handled;
/*
* If not handled, packet needs to be flooded. If the ARP is
* from MX, VM's should not see this ARP as VM's always need to
* Agentas gateway
*/
if (pkt_src) {
sarp = (struct vr_arp *)pkt_data(pkt);
src_nh = vr_inet_ip_lookup(fmd->fmd_dvrf, sarp->arp_spa);
if (vr_gateway_nexthop(src_nh)) {
*flood_to_vms = false;
}
}
goto unhandled;
}
if ((pkt->vp_type != VP_TYPE_IP) && (pkt->vp_type != VP_TYPE_IP6))
goto unhandled;
/*
* V6 Ndisc, router solictation packets are ICMP packets. So we need
* to parse to identify the type, unlike V4 ARP
*/
if (pkt->vp_type == VP_TYPE_IP6)
l4_type = vr_ip6_well_known_packet(pkt);
else if (pkt_src == PKT_SRC_TOR_REPL_TREE)
l4_type = vr_ip_well_known_packet(pkt);
/*
* Special control packets need to be handled only if BMS
*/
if ((pkt_src == PKT_SRC_TOR_REPL_TREE) || !pkt_src) {
/*
* If packet is identified as known packet, we always trap
* it to agent with the exception of DHCP. DHCP can be flooded
* depending on the configuration on VMI or L2 route flags
*/
if (l4_type != L4_TYPE_UNKNOWN) {
trap = true;
if (l4_type == L4_TYPE_DHCP_REQUEST) {
rt_flags = vr_bridge_route_flags(fmd->fmd_dvrf, eth->eth_smac);
if (rt_flags & VR_BE_FLOOD_DHCP_FLAG)
trap = false;
} else if (l4_type == L4_TYPE_NEIGHBOUR_SOLICITATION) {
trap = false;
} else if (l4_type == L4_TYPE_NEIGHBOUR_ADVERTISEMENT) {
flood = true;
}
if (trap && flood) {
pkt_c = nh_mcast_clone(pkt, AGENT_PKT_HEAD_SPACE);
if (!pkt_c) {
trap = false;
}
}
if (trap) {
if (flood) {
vr_trap(pkt_c, fmd->fmd_dvrf,
AGENT_TRAP_L3_PROTOCOLS, NULL);
goto unhandled;
} else {
vr_trap(pkt, fmd->fmd_dvrf,
AGENT_TRAP_L3_PROTOCOLS, NULL);
return handled;
}
}
}
}
if (l4_type == L4_TYPE_NEIGHBOUR_SOLICITATION) {
VR_MAC_COPY(eth_dmac, eth->eth_dmac);
handled = vr_neighbor_input(pkt, fmd, eth_dmac);
if (handled)
return handled;
if (pkt_src) {
ip6 = (struct vr_ip6 *)pkt_data(pkt);
src_nh = vr_inet6_ip_lookup(fmd->fmd_dvrf, ip6->ip6_src);
if (vr_gateway_nexthop(src_nh))
*flood_to_vms = false;
}
}
unhandled:
if (pull_len)
pkt_push(pkt, pull_len);
return 0;
drop:
vr_pfree(pkt, drop_reason);
return 1;
}
static int
nh_composite_mcast_l2(struct vr_packet *pkt, struct vr_nexthop *nh,
struct vr_forwarding_md *fmd)
{
int i, clone_size;
bool flood_to_vms = true;
unsigned short drop_reason, label, pkt_vrf, pull_len;
unsigned int tun_src, pkt_src, hashval, port_range, handled;
struct vr_eth *eth = NULL;
struct vr_nexthop *dir_nh;