/*
* handle unicast arp requests and neighbor refreshes. In many cases,
* we wouldn't like the unicast arp requests from gateway (such as MX)
* to reach the VMs and change the gateway mac to ip(6) binding, since
* for vms the gateway is always agent. We would like such requests
* to go only if the mode is l2
*/
int
vif_plug_mac_request(struct vr_interface *vif, struct vr_packet *pkt,
struct vr_forwarding_md *fmd)
{
int handled = 1;
int nheader;
struct vr_arp *sarp;
if (pkt->vp_flags & VP_FLAG_MULTICAST)
goto unhandled;
nheader = pkt_network_header(pkt) - pkt_data(pkt);
if (nheader < 0 || (pkt->vp_data + nheader > pkt->vp_end))
goto unhandled;
if (pkt->vp_type == VP_TYPE_ARP) {
if (pkt->vp_len < (nheader + sizeof(*sarp)))
goto unhandled;
sarp = (struct vr_arp *)(pkt_data(pkt) + nheader);
if (ntohs(sarp->arp_op) != VR_ARP_OP_REQUEST)
goto unhandled;
pkt_pull(pkt, nheader);
handled = vr_arp_input(pkt, fmd);
if (!handled) {
pkt_push(pkt, nheader);
}
return handled;
} else if (pkt->vp_type == VP_TYPE_IP6) {
if (pkt->vp_len < (nheader + sizeof(struct vr_ip6) +
sizeof(struct vr_icmp) + VR_IP6_ADDRESS_LEN +
sizeof(struct vr_neighbor_option) + VR_ETHER_ALEN))
goto unhandled;
pkt_pull(pkt, nheader);
handled = vr_neighbor_input(pkt, fmd);
if (!handled) {
pkt_push(pkt, nheader);
}
return handled;
}
unhandled:
return !handled;
}
unsigned int
vr_fabric_input(struct vr_interface *vif, struct vr_packet *pkt,
unsigned short vlan_id)
{
int handled = 0;
unsigned short pull_len;
struct vr_forwarding_md fmd;
vr_init_forwarding_md(&fmd);
fmd.fmd_vlan = vlan_id;
fmd.fmd_dvrf = vif->vif_vrf;
if (vr_pkt_type(pkt, 0, &fmd) < 0) {
vif_drop_pkt(vif, pkt, 1);
return 0;
}
if (pkt->vp_type == VP_TYPE_IP6)
return vif_xconnect(vif, pkt, &fmd);
pull_len = pkt_get_network_header_off(pkt) - pkt_head_space(pkt);
pkt_pull(pkt, pull_len);
if (pkt->vp_type == VP_TYPE_IP || pkt->vp_type == VP_TYPE_IP6)
handled = vr_l3_input(pkt, &fmd);
else if (pkt->vp_type == VP_TYPE_ARP)
handled = vr_arp_input(pkt, &fmd);
if (!handled) {
pkt_push(pkt, pull_len);
return vif_xconnect(vif, pkt, &fmd);
}
return 0;
}
static unsigned char *
agent_set_rewrite(struct vr_interface *vif, struct vr_packet *pkt,
unsigned char *rewrite, unsigned short len)
{
unsigned char *head;
unsigned int hdr_len;
struct agent_hdr *hdr;
vr_preset(pkt);
hdr_len = sizeof(struct agent_hdr) + len;
if (pkt_head_space(pkt) < hdr_len) {
pkt = vr_pexpand_head(pkt, hdr_len - pkt_head_space(pkt));
if (!pkt)
return NULL;
}
head = pkt_push(pkt, hdr_len);
if (!head)
return NULL;
/* copy the rewrite first */
memcpy(head, rewrite, len);
hdr = (struct agent_hdr *)(head + len);
hdr->hdr_ifindex = htons(pkt->vp_if->vif_idx);
hdr->hdr_vrf = htons(pkt->vp_if->vif_vrf);
/* this needs some thought */
hdr->hdr_cmd = htons(AGENT_TRAP_NEXTHOP);
hdr->hdr_cmd_param = 0;
return head;
}
static void
vr_arp_proxy(struct vr_arp *sarp, struct vr_packet *pkt,
struct vr_forwarding_md *fmd, unsigned char *dmac)
{
struct vr_eth *eth;
struct vr_arp *arp;
struct vr_forwarding_md fmd_new;
struct vr_interface *vif = pkt->vp_if;
eth = (struct vr_eth *)pkt_push(pkt, sizeof(*eth));
if (!eth) {
vr_pfree(pkt, VP_DROP_PUSH);
return;
}
memcpy(eth->eth_dmac, sarp->arp_sha, VR_ETHER_ALEN);
memcpy(eth->eth_smac, dmac, VR_ETHER_ALEN);
eth->eth_proto = htons(VR_ETH_PROTO_ARP);
arp = (struct vr_arp *)(pkt_data(pkt) + sizeof(*eth));
arp->arp_hw = htons(VR_ARP_HW_TYPE_ETHER);
arp->arp_proto = htons(VR_ETH_PROTO_IP);
arp->arp_hwlen = VR_ETHER_ALEN;
arp->arp_protolen = VR_IP_ADDRESS_LEN;
arp->arp_op = htons(VR_ARP_OP_REPLY);
memcpy(arp->arp_sha, dmac, VR_ETHER_ALEN);
memcpy(arp->arp_dha, sarp->arp_sha, VR_ETHER_ALEN);
memcpy(&arp->arp_dpa, &sarp->arp_spa, sizeof(sarp->arp_spa));
memcpy(&arp->arp_spa, &sarp->arp_dpa, sizeof(sarp->arp_dpa));
vr_init_forwarding_md(&fmd_new);
fmd_new.fmd_dvrf = fmd->fmd_dvrf;
vr_pkt_type(pkt, 0, &fmd_new);
/*
* XXX: for vcp ports, there won't be bridge table entries. to avoid
* doing vr_bridge_input, we check for the flag NO_ARP_PROXY and
* and if set, directly send out on that interface
*/
if (vif_is_vhost(vif) ||
(vif->vif_flags & VIF_FLAG_NO_ARP_PROXY)) {
vif->vif_tx(vif, pkt, fmd);
} else {
vr_bridge_input(vif->vif_router, pkt, &fmd_new);
}
return;
}
static int ccgfs_write(const char *path, const char *buffer, size_t size,
off_t offset, struct fuse_file_info *filp)
{
struct lo_packet *rq;
if (size > 8192)
return -EIO;
rq = mpkt_init(CCGFS_WRITE_REQUEST, PV_STRING + 2 * PV_32 + PV_64);
pkt_push_32(rq, filp->fh);
pkt_push_64(rq, size);
pkt_push_64(rq, offset);
pkt_push(rq, buffer, size, PT_DATA);
mpkt_send(out_fd, rq);
return mpkt_recv(CCGFS_ERRNO_RESPONSE, NULL);
}
int
vr_gro_input(struct vr_packet *pkt, struct vr_nexthop *nh)
{
unsigned short *nh_id;
int handled = 1;
if (!vr_gro_process)
return !handled;
nh_id = (unsigned short *)pkt_push(pkt, sizeof(*nh_id));
if (!nh_id) {
vr_pfree(pkt, VP_DROP_PUSH);
return handled;
}
*nh_id = nh->nh_id;
handled = vr_gro_process(pkt, nh->nh_dev, (nh->nh_family == AF_BRIDGE));
return handled;
}
/*
* in the rewrite case, we will assume the positive case of caller
* passing us valid rewrite ptr and len and will not check for those
*/
static unsigned char *
vif_cmn_rewrite(struct vr_interface *vif, struct vr_packet *pkt,
unsigned char *rewrite, unsigned short len)
{
unsigned char *head;
if (pkt_head_space(pkt) < len) {
pkt = vr_pexpand_head(pkt, len - pkt_head_space(pkt));
if (!pkt)
return NULL;
}
head = pkt_push(pkt, len);
if (!head)
return NULL;
memcpy(head, rewrite, len);
return head;
}
/*
* Function to add vlan tag to ethernet header. As it modifies vr_packet
* structure and not skb, one is expected to invoke vr_pset_data() to
* modify the data pointer of skb
*/
int
vr_tag_pkt(struct vr_packet *pkt, unsigned short vlan_id)
{
struct vr_eth *new_eth, *eth;
unsigned short *vlan_tag;
eth = (struct vr_eth *)pkt_data(pkt);
if (eth->eth_proto == htons(VR_ETH_PROTO_VLAN))
return 0;
new_eth = (struct vr_eth *)pkt_push(pkt, VR_VLAN_HLEN);
if (!new_eth)
return -1;
memmove(new_eth, eth, (2 * VR_ETHER_ALEN));
new_eth->eth_proto = htons(VR_ETH_PROTO_VLAN);
vlan_tag = (unsigned short *)(new_eth + 1);
*vlan_tag = htons(vlan_id);
return 0;
}
bool
vr_l2_mcast_control_data_add(struct vr_packet *pkt)
{
unsigned int *data;
if (pkt_head_space(pkt) < VR_L2_MCAST_CTRL_DATA_LEN) {
pkt = vr_pexpand_head(pkt, VR_L2_MCAST_CTRL_DATA_LEN -
pkt_head_space(pkt));
if (!pkt)
return false;
}
data = (unsigned int *)pkt_push(pkt, VR_L2_MCAST_CTRL_DATA_LEN);
if (!data)
return false;
*data = VR_L2_MCAST_CTRL_DATA;
pkt->vp_type = VP_TYPE_L2;
pkt->vp_flags |= VP_FLAG_MULTICAST;
return true;
}
static int
agent_send(struct vr_interface *vif, struct vr_packet *pkt,
void *ifspecific)
{
int len;
struct agent_hdr *hdr;
unsigned char *rewrite;
struct vr_interface_stats *stats = vif_get_stats(vif, pkt->vp_cpu);
struct vr_packet *pkt_c;
struct agent_send_params *params =
(struct agent_send_params *)ifspecific;
vr_preset(pkt);
if (pkt_head_space(pkt) < AGENT_PKT_HEAD_SPACE) {
len = pkt_len(pkt);
if (agent_trap_may_truncate(params->trap_reason)) {
len = MINIMUM(len, VR_AGENT_MIN_PACKET_LEN);
}
pkt_c = pkt_copy(pkt, 0, len);
if (pkt_c) {
vr_pfree(pkt, VP_DROP_DUPLICATED);
pkt = pkt_c;
}
}
hdr = (struct agent_hdr *)pkt_push(pkt, sizeof(struct agent_hdr));
if (!hdr)
goto drop;
hdr->hdr_ifindex = htons(pkt->vp_if->vif_idx);
hdr->hdr_vrf = htons(params->trap_vrf);
hdr->hdr_cmd = htons(params->trap_reason);
switch (params->trap_reason) {
case AGENT_TRAP_FLOW_MISS:
case AGENT_TRAP_ECMP_RESOLVE:
case AGENT_TRAP_SOURCE_MISMATCH:
if (params->trap_param)
hdr->hdr_cmd_param = htonl(*(unsigned int *)(params->trap_param));
break;
case AGENT_TRAP_DIAG:
if (params->trap_param)
hdr->hdr_cmd_param = htonl(*(unsigned int *)(params->trap_param));
break;
default:
hdr->hdr_cmd_param = 0;
break;
}
rewrite = pkt_push(pkt, VR_ETHER_HLEN);
if (!rewrite)
goto drop;
memcpy(rewrite, vif->vif_rewrite, VR_ETHER_HLEN);
return vif->vif_tx(vif, pkt);
drop:
stats->vis_oerrors++;
vr_pfree(pkt, VP_DROP_PUSH);
return 0;
}
int
vr_mirror(struct vrouter *router, uint8_t mirror_id, struct vr_packet *pkt,
struct vr_forwarding_md *fmd, mirror_type_t mtype)
{
bool reset = true;
void *mirror_md;
unsigned char *buf, default_mme[2] = {0xff, 0x0};
unsigned int captured_len, clone_len = 0;
unsigned int mirror_md_len = 0, drop_reason;
struct vr_nexthop *nh, *pkt_nh;
struct vr_mirror_entry *mirror;
struct vr_mirror_meta_entry *mme;
struct vr_forwarding_md new_fmd;
/* If the packet is already mirrored, dont mirror again */
if (pkt->vp_flags & VP_FLAG_FROM_DP)
return 0;
if (mtype <= MIRROR_TYPE_UNKNOWN || mtype >= MIRROR_TYPE_MAX)
return 0;
mirror = router->vr_mirrors[mirror_id];
if (!mirror)
return 0;
if (mirror->mir_flags & VR_MIRROR_FLAG_HW_ASSISTED) {
vr_fmd_put_mirror_vlan(fmd, mirror->mir_vlan_id);
return 0;
}
memcpy(&new_fmd, fmd, sizeof(*fmd));
new_fmd.fmd_ecmp_nh_index = -1;
fmd = &new_fmd;
vr_fmd_put_mirror_type(fmd, mtype);
nh = mirror->mir_nh;
if (!nh || !(nh->nh_flags & NH_FLAG_VALID))
return 0;
pkt = vr_pclone(pkt);
if (!pkt)
return 0;
/* Mark as mirrored */
pkt->vp_flags |= VP_FLAG_FROM_DP;
/* Set the GSO and partial checksum flag */
pkt->vp_flags |= (VP_FLAG_FLOW_SET | VP_FLAG_GSO);
vr_pkt_unset_gro(pkt);
if (mirror->mir_flags & VR_MIRROR_FLAG_DYNAMIC) {
if (mtype == MIRROR_TYPE_ACL) {
if (fmd->fmd_flow_index >= 0) {
mme = (struct vr_mirror_meta_entry *)
vr_itable_get(router->vr_mirror_md, fmd->fmd_flow_index);
if (mme) {
mirror_md_len = mme->mirror_md_len;
mirror_md = mme->mirror_md;
}
}
} else if (mtype == MIRROR_TYPE_PORT_RX) {
if (!pkt->vp_if) {
drop_reason = VP_DROP_INVALID_IF;
goto fail;
}
mirror_md_len = pkt->vp_if->vif_in_mirror_md_len;
mirror_md = pkt->vp_if->vif_in_mirror_md;
} else {
if (!pkt->vp_nh || !pkt->vp_nh->nh_dev) {
drop_reason = VP_DROP_INVALID_NH;
goto fail;
}
mirror_md_len = pkt->vp_nh->nh_dev->vif_out_mirror_md_len;
mirror_md = pkt->vp_nh->nh_dev->vif_out_mirror_md;
}
if (!mirror_md_len) {
mirror_md = default_mme;
mirror_md_len = sizeof(default_mme);
}
clone_len += mirror_md_len;
clone_len += VR_MIRROR_PKT_HEAD_SPACE;
} else {
clone_len += VR_VXLAN_HDR_LEN;
fmd->fmd_label = mirror->mir_vni;
}
if (pkt->vp_if && (pkt->vp_if->vif_type == VIF_TYPE_PHYSICAL)) {
/* No need to mirror the Tunnel headers. So packet cant be reset */
reset = false;
/* Identify whether the packet currently has L2 header. If not a
* port mirroring, we need to add the extra L2 header
*/
if (mtype == MIRROR_TYPE_ACL) {
pkt_nh = pkt->vp_nh;
if (pkt_nh && (pkt_nh->nh_flags & NH_FLAG_VALID) &&
(pkt_nh->nh_type == NH_ENCAP) &&
(pkt_nh->nh_family == AF_INET)) {
clone_len += pkt_nh->nh_encap_len;
if (vr_pcow(&pkt, clone_len)) {
drop_reason = VP_DROP_PCOW_FAIL;
goto fail;
}
clone_len = 0;
if (pkt_nh->nh_dev->vif_set_rewrite(pkt_nh->nh_dev, pkt, fmd,
pkt_nh->nh_data, pkt_nh->nh_encap_len) < 0) {
drop_reason = VP_DROP_REWRITE_FAIL;
goto fail;
}
}
}
}
if (reset)
vr_preset(pkt);
if (clone_len) {
if (vr_pcow(&pkt, clone_len)) {
drop_reason = VP_DROP_PCOW_FAIL;
goto fail;
}
}
captured_len = htonl(pkt_len(pkt));
if (mirror_md_len) {
buf = pkt_push(pkt, mirror_md_len);
if (!buf) {
drop_reason = VP_DROP_PUSH;
goto fail;
}
memcpy(buf, mirror_md, mirror_md_len);
}
if (nh->nh_vrf >= 0)
fmd->fmd_dvrf = nh->nh_vrf;
/*
* we are now in the mirroring context and there isn't a flow for this
* mirror packet. hence, set the flow index to -1.
*/
fmd->fmd_flow_index = -1;
fmd->fmd_outer_src_ip = 0;
nh_output(pkt, nh, fmd);
return 0;
fail:
vr_pfree(pkt, drop_reason);
return 0;
}
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;
unsigned short pull_len, overlay_len = VROUTER_L2_OVERLAY_LEN;
int reason;
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 =(int8_t *) pkt_data(pkt);
/* 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) {
vr_pfree(pkt, VP_DROP_L2_NO_ROUTE);
return 0;
}
if (nh->nh_type == NH_L2_RCV)
overlay_len = VROUTER_OVERLAY_LEN;
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) {
pull_len = pkt_get_network_header_off(pkt) - pkt_head_space(pkt);
if (!pkt_pull(pkt, pull_len)) {
vr_pfree(pkt, VP_DROP_PULL);
return 0;
}
if ((reason = vr_pkt_from_vm_tcp_mss_adj(pkt, overlay_len))) {
vr_pfree(pkt, reason);
return 0;
}
if (!pkt_push(pkt, pull_len)) {
vr_pfree(pkt, VP_DROP_PUSH);
return 0;
}
}
}
/*
* If there is a label attached to this bridge entry add the
* label
*/
if (rt.rtr_req.rtr_label_flags & VR_RT_LABEL_VALID_FLAG) {
if (!fmd) {
vr_init_forwarding_md(&cmd);
fmd = &cmd;
}
fmd->fmd_label = rt.rtr_req.rtr_label;
}
nh_output(pkt, nh, fmd);
return 0;
}
unsigned int
vr_bridge_input(struct vrouter *router, struct vr_packet *pkt,
struct vr_forwarding_md *fmd)
{
int reason, handled;
l4_pkt_type_t l4_type = L4_TYPE_UNKNOWN;
unsigned short pull_len, overlay_len = VROUTER_OVERLAY_LEN;
int8_t *dmac;
struct vr_bridge_entry *be;
struct vr_nexthop *nh = NULL;
struct vr_vrf_stats *stats;
dmac = (int8_t *) pkt_data(pkt);
if (pkt->vp_if->vif_flags & VIF_FLAG_MAC_LEARN) {
if (vr_bridge_learn(router, pkt, fmd)) {
return 0;
}
}
pull_len = 0;
if ((pkt->vp_type == VP_TYPE_IP) || (pkt->vp_type == VP_TYPE_IP6) ||
(pkt->vp_type == VP_TYPE_ARP)) {
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 ((pkt->vp_type == VP_TYPE_IP) || (pkt->vp_type == VP_TYPE_IP6)) {
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));
}
}
} else {
if (fmd->fmd_dotonep < 0) {
fmd->fmd_dotonep = vr_vlan_get_tos(pkt_data(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;
}
}
/*
* Handle the unicast ARP, coming from VM, not
* destined to us. Broadcast ARP requests would be handled
* in L2 multicast nexthop. Multicast ARP on fabric
* interface also would be handled in L2 multicast nexthop.
* Unicast ARP packets on fabric interface would be handled
* in plug routines of interface.
*/
if (!IS_MAC_BMCAST(dmac)) {
handled = 0;
if (pkt->vp_type == VP_TYPE_ARP) {
handled = vr_arp_input(pkt, fmd, dmac);
} else if (l4_type == L4_TYPE_NEIGHBOUR_SOLICITATION) {
handled = vr_neighbor_input(pkt, fmd, dmac);
}
if (handled)
return 0;
}
}
be = bridge_lookup(dmac, fmd);
if (be)
nh = be->be_nh;
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(dmac)) {
vr_pfree(pkt, VP_DROP_L2_NO_ROUTE);
return 0;
}
be = bridge_lookup(vr_bcast_mac, fmd);
nh = be->be_nh;
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 (be)
__sync_fetch_and_add(&be->be_packets, 1);
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 (pull_len && !pkt_push(pkt, pull_len)) {
vr_pfree(pkt, VP_DROP_PUSH);
return 0;
}
nh_output(pkt, nh, fmd);
return 0;
}
