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/*
* Copyright (c) 2016 Chelsio Communications, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/tcp.h>
#include <linux/ipv6.h>
#include <net/inet_ecn.h>
#include <net/route.h>
#include <net/ip6_route.h>
#include "libcxgb_cm.h"
void
cxgb_get_4tuple(struct cpl_pass_accept_req *req, enum chip_type type,
int *iptype, __u8 *local_ip, __u8 *peer_ip,
__be16 *local_port, __be16 *peer_port)
{
int eth_len = (CHELSIO_CHIP_VERSION(type) <= CHELSIO_T5) ?
ETH_HDR_LEN_G(be32_to_cpu(req->hdr_len)) :
T6_ETH_HDR_LEN_G(be32_to_cpu(req->hdr_len));
int ip_len = (CHELSIO_CHIP_VERSION(type) <= CHELSIO_T5) ?
IP_HDR_LEN_G(be32_to_cpu(req->hdr_len)) :
T6_IP_HDR_LEN_G(be32_to_cpu(req->hdr_len));
struct iphdr *ip = (struct iphdr *)((u8 *)(req + 1) + eth_len);
struct ipv6hdr *ip6 = (struct ipv6hdr *)((u8 *)(req + 1) + eth_len);
struct tcphdr *tcp = (struct tcphdr *)
((u8 *)(req + 1) + eth_len + ip_len);
if (ip->version == 4) {
pr_debug("%s saddr 0x%x daddr 0x%x sport %u dport %u\n",
__func__, ntohl(ip->saddr), ntohl(ip->daddr),
ntohs(tcp->source), ntohs(tcp->dest));
*iptype = 4;
memcpy(peer_ip, &ip->saddr, 4);
memcpy(local_ip, &ip->daddr, 4);
} else {
pr_debug("%s saddr %pI6 daddr %pI6 sport %u dport %u\n",
__func__, ip6->saddr.s6_addr, ip6->daddr.s6_addr,
ntohs(tcp->source), ntohs(tcp->dest));
*iptype = 6;
memcpy(peer_ip, ip6->saddr.s6_addr, 16);
memcpy(local_ip, ip6->daddr.s6_addr, 16);
}
*peer_port = tcp->source;
*local_port = tcp->dest;
}
EXPORT_SYMBOL(cxgb_get_4tuple);
static bool
cxgb_our_interface(struct cxgb4_lld_info *lldi,
struct net_device *(*get_real_dev)(struct net_device *),
struct net_device *egress_dev)
{
int i;
egress_dev = get_real_dev(egress_dev);
for (i = 0; i < lldi->nports; i++)
if (lldi->ports[i] == egress_dev)
return true;
return false;
}
struct dst_entry *
cxgb_find_route(struct cxgb4_lld_info *lldi,
struct net_device *(*get_real_dev)(struct net_device *),
__be32 local_ip, __be32 peer_ip, __be16 local_port,
__be16 peer_port, u8 tos)
{
struct rtable *rt;
struct flowi4 fl4;
struct neighbour *n;
rt = ip_route_output_ports(&init_net, &fl4, NULL, peer_ip, local_ip,
peer_port, local_port, IPPROTO_TCP,
tos & ~INET_ECN_MASK, 0);
if (IS_ERR(rt))
return NULL;
n = dst_neigh_lookup(&rt->dst, &peer_ip);
if (!n)
return NULL;
if (!cxgb_our_interface(lldi, get_real_dev, n->dev) &&
!(n->dev->flags & IFF_LOOPBACK)) {
neigh_release(n);
dst_release(&rt->dst);
return NULL;
}
neigh_release(n);
return &rt->dst;
}
EXPORT_SYMBOL(cxgb_find_route);
struct dst_entry *
cxgb_find_route6(struct cxgb4_lld_info *lldi,
struct net_device *(*get_real_dev)(struct net_device *),
__u8 *local_ip, __u8 *peer_ip, __be16 local_port,
__be16 peer_port, u8 tos, __u32 sin6_scope_id)
{
struct dst_entry *dst = NULL;
if (IS_ENABLED(CONFIG_IPV6)) {
struct flowi6 fl6;
memset(&fl6, 0, sizeof(fl6));
memcpy(&fl6.daddr, peer_ip, 16);
memcpy(&fl6.saddr, local_ip, 16);
if (ipv6_addr_type(&fl6.daddr) & IPV6_ADDR_LINKLOCAL)
fl6.flowi6_oif = sin6_scope_id;
dst = ip6_route_output(&init_net, NULL, &fl6);
if (dst->error ||
(!cxgb_our_interface(lldi, get_real_dev,
ip6_dst_idev(dst)->dev) &&
!(ip6_dst_idev(dst)->dev->flags & IFF_LOOPBACK))) {
dst_release(dst);
return NULL;
}
}
return dst;
}
EXPORT_SYMBOL(cxgb_find_route6);
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