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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
* Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
*/
#include <linux/skbuff.h>
#include "rxe.h"
#include "rxe_loc.h"
/* check that QP matches packet opcode type and is in a valid state */
static int check_type_state(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
struct rxe_qp *qp)
{
unsigned int pkt_type;
if (unlikely(!qp->valid))
goto err1;
pkt_type = pkt->opcode & 0xe0;
switch (qp_type(qp)) {
case IB_QPT_RC:
if (unlikely(pkt_type != IB_OPCODE_RC)) {
pr_warn_ratelimited("bad qp type\n");
goto err1;
}
break;
case IB_QPT_UC:
if (unlikely(pkt_type != IB_OPCODE_UC)) {
pr_warn_ratelimited("bad qp type\n");
goto err1;
}
break;
case IB_QPT_UD:
case IB_QPT_SMI:
case IB_QPT_GSI:
if (unlikely(pkt_type != IB_OPCODE_UD)) {
pr_warn_ratelimited("bad qp type\n");
goto err1;
}
break;
default:
pr_warn_ratelimited("unsupported qp type\n");
goto err1;
}
if (pkt->mask & RXE_REQ_MASK) {
if (unlikely(qp->resp.state != QP_STATE_READY))
goto err1;
} else if (unlikely(qp->req.state < QP_STATE_READY ||
qp->req.state > QP_STATE_DRAINED)) {
goto err1;
}
return 0;
err1:
return -EINVAL;
}
static void set_bad_pkey_cntr(struct rxe_port *port)
{
spin_lock_bh(&port->port_lock);
port->attr.bad_pkey_cntr = min((u32)0xffff,
port->attr.bad_pkey_cntr + 1);
spin_unlock_bh(&port->port_lock);
}
static void set_qkey_viol_cntr(struct rxe_port *port)
{
spin_lock_bh(&port->port_lock);
port->attr.qkey_viol_cntr = min((u32)0xffff,
port->attr.qkey_viol_cntr + 1);
spin_unlock_bh(&port->port_lock);
}
static int check_keys(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
u32 qpn, struct rxe_qp *qp)
{
struct rxe_port *port = &rxe->port;
u16 pkey = bth_pkey(pkt);
pkt->pkey_index = 0;
if (!pkey_match(pkey, IB_DEFAULT_PKEY_FULL)) {
pr_warn_ratelimited("bad pkey = 0x%x\n", pkey);
set_bad_pkey_cntr(port);
goto err1;
}
if (qp_type(qp) == IB_QPT_UD || qp_type(qp) == IB_QPT_GSI) {
u32 qkey = (qpn == 1) ? GSI_QKEY : qp->attr.qkey;
if (unlikely(deth_qkey(pkt) != qkey)) {
pr_warn_ratelimited("bad qkey, got 0x%x expected 0x%x for qpn 0x%x\n",
deth_qkey(pkt), qkey, qpn);
set_qkey_viol_cntr(port);
goto err1;
}
}
return 0;
err1:
return -EINVAL;
}
static int check_addr(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
struct rxe_qp *qp)
{
struct sk_buff *skb = PKT_TO_SKB(pkt);
if (qp_type(qp) != IB_QPT_RC && qp_type(qp) != IB_QPT_UC)
goto done;
if (unlikely(pkt->port_num != qp->attr.port_num)) {
pr_warn_ratelimited("port %d != qp port %d\n",
pkt->port_num, qp->attr.port_num);
goto err1;
}
if (skb->protocol == htons(ETH_P_IP)) {
struct in_addr *saddr =
&qp->pri_av.sgid_addr._sockaddr_in.sin_addr;
struct in_addr *daddr =
&qp->pri_av.dgid_addr._sockaddr_in.sin_addr;
if (ip_hdr(skb)->daddr != saddr->s_addr) {
pr_warn_ratelimited("dst addr %pI4 != qp source addr %pI4\n",
&ip_hdr(skb)->daddr,
&saddr->s_addr);
goto err1;
}
if (ip_hdr(skb)->saddr != daddr->s_addr) {
pr_warn_ratelimited("source addr %pI4 != qp dst addr %pI4\n",
&ip_hdr(skb)->saddr,
&daddr->s_addr);
goto err1;
}
} else if (skb->protocol == htons(ETH_P_IPV6)) {
struct in6_addr *saddr =
&qp->pri_av.sgid_addr._sockaddr_in6.sin6_addr;
struct in6_addr *daddr =
&qp->pri_av.dgid_addr._sockaddr_in6.sin6_addr;
if (memcmp(&ipv6_hdr(skb)->daddr, saddr, sizeof(*saddr))) {
pr_warn_ratelimited("dst addr %pI6 != qp source addr %pI6\n",
&ipv6_hdr(skb)->daddr, saddr);
goto err1;
}
if (memcmp(&ipv6_hdr(skb)->saddr, daddr, sizeof(*daddr))) {
pr_warn_ratelimited("source addr %pI6 != qp dst addr %pI6\n",
&ipv6_hdr(skb)->saddr, daddr);
goto err1;
}
}
done:
return 0;
err1:
return -EINVAL;
}
static int hdr_check(struct rxe_pkt_info *pkt)
{
struct rxe_dev *rxe = pkt->rxe;
struct rxe_port *port = &rxe->port;
struct rxe_qp *qp = NULL;
u32 qpn = bth_qpn(pkt);
int index;
int err;
if (unlikely(bth_tver(pkt) != BTH_TVER)) {
pr_warn_ratelimited("bad tver\n");
goto err1;
}
if (unlikely(qpn == 0)) {
pr_warn_once("QP 0 not supported");
goto err1;
}
if (qpn != IB_MULTICAST_QPN) {
index = (qpn == 1) ? port->qp_gsi_index : qpn;
qp = rxe_pool_get_index(&rxe->qp_pool, index);
if (unlikely(!qp)) {
pr_warn_ratelimited("no qp matches qpn 0x%x\n", qpn);
goto err1;
}
err = check_type_state(rxe, pkt, qp);
if (unlikely(err))
goto err2;
err = check_addr(rxe, pkt, qp);
if (unlikely(err))
goto err2;
err = check_keys(rxe, pkt, qpn, qp);
if (unlikely(err))
goto err2;
} else {
if (unlikely((pkt->mask & RXE_GRH_MASK) == 0)) {
pr_warn_ratelimited("no grh for mcast qpn\n");
goto err1;
}
}
pkt->qp = qp;
return 0;
err2:
rxe_put(qp);
err1:
return -EINVAL;
}
static inline void rxe_rcv_pkt(struct rxe_pkt_info *pkt, struct sk_buff *skb)
{
if (pkt->mask & RXE_REQ_MASK)
rxe_resp_queue_pkt(pkt->qp, skb);
else
rxe_comp_queue_pkt(pkt->qp, skb);
}
static void rxe_rcv_mcast_pkt(struct rxe_dev *rxe, struct sk_buff *skb)
{
struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
struct rxe_mcg *mcg;
struct rxe_mca *mca;
struct rxe_qp *qp;
union ib_gid dgid;
int err;
if (skb->protocol == htons(ETH_P_IP))
ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
(struct in6_addr *)&dgid);
else if (skb->protocol == htons(ETH_P_IPV6))
memcpy(&dgid, &ipv6_hdr(skb)->daddr, sizeof(dgid));
/* lookup mcast group corresponding to mgid, takes a ref */
mcg = rxe_lookup_mcg(rxe, &dgid);
if (!mcg)
goto drop; /* mcast group not registered */
spin_lock_bh(&rxe->mcg_lock);
/* this is unreliable datagram service so we let
* failures to deliver a multicast packet to a
* single QP happen and just move on and try
* the rest of them on the list
*/
list_for_each_entry(mca, &mcg->qp_list, qp_list) {
qp = mca->qp;
/* validate qp for incoming packet */
err = check_type_state(rxe, pkt, qp);
if (err)
continue;
err = check_keys(rxe, pkt, bth_qpn(pkt), qp);
if (err)
continue;
/* for all but the last QP create a new clone of the
* skb and pass to the QP. Pass the original skb to
* the last QP in the list.
*/
if (mca->qp_list.next != &mcg->qp_list) {
struct sk_buff *cskb;
struct rxe_pkt_info *cpkt;
cskb = skb_clone(skb, GFP_ATOMIC);
if (unlikely(!cskb))
continue;
if (WARN_ON(!ib_device_try_get(&rxe->ib_dev))) {
kfree_skb(cskb);
break;
}
cpkt = SKB_TO_PKT(cskb);
cpkt->qp = qp;
rxe_get(qp);
rxe_rcv_pkt(cpkt, cskb);
} else {
pkt->qp = qp;
rxe_get(qp);
rxe_rcv_pkt(pkt, skb);
skb = NULL; /* mark consumed */
}
}
spin_unlock_bh(&rxe->mcg_lock);
kref_put(&mcg->ref_cnt, rxe_cleanup_mcg);
if (likely(!skb))
return;
/* This only occurs if one of the checks fails on the last
* QP in the list above
*/
drop:
kfree_skb(skb);
ib_device_put(&rxe->ib_dev);
}
/**
* rxe_chk_dgid - validate destination IP address
* @rxe: rxe device that received packet
* @skb: the received packet buffer
*
* Accept any loopback packets
* Extract IP address from packet and
* Accept if multicast packet
* Accept if matches an SGID table entry
*/
static int rxe_chk_dgid(struct rxe_dev *rxe, struct sk_buff *skb)
{
struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
const struct ib_gid_attr *gid_attr;
union ib_gid dgid;
union ib_gid *pdgid;
if (pkt->mask & RXE_LOOPBACK_MASK)
return 0;
if (skb->protocol == htons(ETH_P_IP)) {
ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
(struct in6_addr *)&dgid);
pdgid = &dgid;
} else {
pdgid = (union ib_gid *)&ipv6_hdr(skb)->daddr;
}
if (rdma_is_multicast_addr((struct in6_addr *)pdgid))
return 0;
gid_attr = rdma_find_gid_by_port(&rxe->ib_dev, pdgid,
IB_GID_TYPE_ROCE_UDP_ENCAP,
1, skb->dev);
if (IS_ERR(gid_attr))
return PTR_ERR(gid_attr);
rdma_put_gid_attr(gid_attr);
return 0;
}
/* rxe_rcv is called from the interface driver */
void rxe_rcv(struct sk_buff *skb)
{
int err;
struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
struct rxe_dev *rxe = pkt->rxe;
if (unlikely(skb->len < RXE_BTH_BYTES))
goto drop;
if (rxe_chk_dgid(rxe, skb) < 0) {
pr_warn_ratelimited("failed checking dgid\n");
goto drop;
}
pkt->opcode = bth_opcode(pkt);
pkt->psn = bth_psn(pkt);
pkt->qp = NULL;
pkt->mask |= rxe_opcode[pkt->opcode].mask;
if (unlikely(skb->len < header_size(pkt)))
goto drop;
err = hdr_check(pkt);
if (unlikely(err))
goto drop;
err = rxe_icrc_check(skb, pkt);
if (unlikely(err))
goto drop;
rxe_counter_inc(rxe, RXE_CNT_RCVD_PKTS);
if (unlikely(bth_qpn(pkt) == IB_MULTICAST_QPN))
rxe_rcv_mcast_pkt(rxe, skb);
else
rxe_rcv_pkt(pkt, skb);
return;
drop:
if (pkt->qp)
rxe_put(pkt->qp);
kfree_skb(skb);
ib_device_put(&rxe->ib_dev);
}
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