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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
/*
* Copyright 2021 Marvell. All rights reserved.
*/
#include <linux/types.h>
#include <asm/byteorder.h>
#include <asm/param.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/etherdevice.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/errno.h>
#include <net/tcp.h>
#include <linux/qed/qed_nvmetcp_ip_services_if.h>
#define QED_IP_RESOL_TIMEOUT 4
int qed_route_ipv4(struct sockaddr_storage *local_addr,
struct sockaddr_storage *remote_addr,
struct sockaddr *hardware_address,
struct net_device **ndev)
{
struct neighbour *neigh = NULL;
__be32 *loc_ip, *rem_ip;
struct rtable *rt;
int rc = -ENXIO;
int retry;
loc_ip = &((struct sockaddr_in *)local_addr)->sin_addr.s_addr;
rem_ip = &((struct sockaddr_in *)remote_addr)->sin_addr.s_addr;
*ndev = NULL;
rt = ip_route_output(&init_net, *rem_ip, *loc_ip, 0/*tos*/, 0/*oif*/);
if (IS_ERR(rt)) {
pr_err("lookup route failed\n");
rc = PTR_ERR(rt);
goto return_err;
}
neigh = dst_neigh_lookup(&rt->dst, rem_ip);
if (!neigh) {
rc = -ENOMEM;
ip_rt_put(rt);
goto return_err;
}
*ndev = rt->dst.dev;
ip_rt_put(rt);
/* If not resolved, kick-off state machine towards resolution */
if (!(neigh->nud_state & NUD_VALID))
neigh_event_send(neigh, NULL);
/* query neighbor until resolved or timeout */
retry = QED_IP_RESOL_TIMEOUT;
while (!(neigh->nud_state & NUD_VALID) && retry > 0) {
msleep(1000);
retry--;
}
if (neigh->nud_state & NUD_VALID) {
/* copy resolved MAC address */
neigh_ha_snapshot(hardware_address->sa_data, neigh, *ndev);
hardware_address->sa_family = (*ndev)->type;
rc = 0;
}
neigh_release(neigh);
if (!(*loc_ip)) {
*loc_ip = inet_select_addr(*ndev, *rem_ip, RT_SCOPE_UNIVERSE);
local_addr->ss_family = AF_INET;
}
return_err:
return rc;
}
EXPORT_SYMBOL(qed_route_ipv4);
int qed_route_ipv6(struct sockaddr_storage *local_addr,
struct sockaddr_storage *remote_addr,
struct sockaddr *hardware_address,
struct net_device **ndev)
{
struct neighbour *neigh = NULL;
struct dst_entry *dst;
struct flowi6 fl6;
int rc = -ENXIO;
int retry;
memset(&fl6, 0, sizeof(fl6));
fl6.saddr = ((struct sockaddr_in6 *)local_addr)->sin6_addr;
fl6.daddr = ((struct sockaddr_in6 *)remote_addr)->sin6_addr;
dst = ip6_route_output(&init_net, NULL, &fl6);
if (!dst || dst->error) {
if (dst) {
dst_release(dst);
pr_err("lookup route failed %d\n", dst->error);
}
goto out;
}
neigh = dst_neigh_lookup(dst, &fl6.daddr);
if (neigh) {
*ndev = ip6_dst_idev(dst)->dev;
/* If not resolved, kick-off state machine towards resolution */
if (!(neigh->nud_state & NUD_VALID))
neigh_event_send(neigh, NULL);
/* query neighbor until resolved or timeout */
retry = QED_IP_RESOL_TIMEOUT;
while (!(neigh->nud_state & NUD_VALID) && retry > 0) {
msleep(1000);
retry--;
}
if (neigh->nud_state & NUD_VALID) {
neigh_ha_snapshot((u8 *)hardware_address->sa_data,
neigh, *ndev);
hardware_address->sa_family = (*ndev)->type;
rc = 0;
}
neigh_release(neigh);
if (ipv6_addr_any(&fl6.saddr)) {
if (ipv6_dev_get_saddr(dev_net(*ndev), *ndev,
&fl6.daddr, 0, &fl6.saddr)) {
pr_err("Unable to find source IP address\n");
goto out;
}
local_addr->ss_family = AF_INET6;
((struct sockaddr_in6 *)local_addr)->sin6_addr =
fl6.saddr;
}
}
dst_release(dst);
out:
return rc;
}
EXPORT_SYMBOL(qed_route_ipv6);
void qed_vlan_get_ndev(struct net_device **ndev, u16 *vlan_id)
{
if (is_vlan_dev(*ndev)) {
*vlan_id = vlan_dev_vlan_id(*ndev);
*ndev = vlan_dev_real_dev(*ndev);
}
}
EXPORT_SYMBOL(qed_vlan_get_ndev);
struct pci_dev *qed_validate_ndev(struct net_device *ndev)
{
struct pci_dev *pdev = NULL;
struct net_device *upper;
for_each_pci_dev(pdev) {
if (pdev && pdev->driver &&
!strcmp(pdev->driver->name, "qede")) {
upper = pci_get_drvdata(pdev);
if (upper->ifindex == ndev->ifindex)
return pdev;
}
}
return NULL;
}
EXPORT_SYMBOL(qed_validate_ndev);
__be16 qed_get_in_port(struct sockaddr_storage *sa)
{
return sa->ss_family == AF_INET
? ((struct sockaddr_in *)sa)->sin_port
: ((struct sockaddr_in6 *)sa)->sin6_port;
}
EXPORT_SYMBOL(qed_get_in_port);
int qed_fetch_tcp_port(struct sockaddr_storage local_ip_addr,
struct socket **sock, u16 *port)
{
struct sockaddr_storage sa;
int rc = 0;
rc = sock_create(local_ip_addr.ss_family, SOCK_STREAM, IPPROTO_TCP,
sock);
if (rc) {
pr_warn("failed to create socket: %d\n", rc);
goto err;
}
(*sock)->sk->sk_allocation = GFP_KERNEL;
sk_set_memalloc((*sock)->sk);
rc = kernel_bind(*sock, (struct sockaddr *)&local_ip_addr,
sizeof(local_ip_addr));
if (rc) {
pr_warn("failed to bind socket: %d\n", rc);
goto err_sock;
}
rc = kernel_getsockname(*sock, (struct sockaddr *)&sa);
if (rc < 0) {
pr_warn("getsockname() failed: %d\n", rc);
goto err_sock;
}
*port = ntohs(qed_get_in_port(&sa));
return 0;
err_sock:
sock_release(*sock);
sock = NULL;
err:
return rc;
}
EXPORT_SYMBOL(qed_fetch_tcp_port);
void qed_return_tcp_port(struct socket *sock)
{
if (sock && sock->sk) {
tcp_set_state(sock->sk, TCP_CLOSE);
sock_release(sock);
}
}
EXPORT_SYMBOL(qed_return_tcp_port);
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