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