chelsio/libcxgb/libcxgb_cm.c

0001 /*
0002  * Copyright (c) 2016 Chelsio Communications, Inc. All rights reserved.
0003  *
0004  * This software is available to you under a choice of one of two
0005  * licenses.  You may choose to be licensed under the terms of the GNU
0006  * General Public License (GPL) Version 2, available from the file
0007  * COPYING in the main directory of this source tree, or the
0008  * OpenIB.org BSD license below:
0009  *
0010  *     Redistribution and use in source and binary forms, with or
0011  *     without modification, are permitted provided that the following
0012  *     conditions are met:
0013  *
0014  *      - Redistributions of source code must retain the above
0015  *    copyright notice, this list of conditions and the following
0016  *    disclaimer.
0017  *
0018  *      - Redistributions in binary form must reproduce the above
0019  *    copyright notice, this list of conditions and the following
0020  *    disclaimer in the documentation and/or other materials
0021  *    provided with the distribution.
0022  *
0023  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
0024  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
0025  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
0026  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
0027  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
0028  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
0029  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
0030  * SOFTWARE.
0031  */
0032
0033 #include <linux/tcp.h>
0034 #include <linux/ipv6.h>
0035 #include <net/inet_ecn.h>
0036 #include <net/route.h>
0037 #include <net/ip6_route.h>
0038
0039 #include "libcxgb_cm.h"
0040
0041 void
0042 cxgb_get_4tuple(struct cpl_pass_accept_req *req, enum chip_type type,
0043         int *iptype, __u8 *local_ip, __u8 *peer_ip,
0044         __be16 *local_port, __be16 *peer_port)
0045 {
0046     int eth_len = (CHELSIO_CHIP_VERSION(type) <= CHELSIO_T5) ?
0047               ETH_HDR_LEN_G(be32_to_cpu(req->hdr_len)) :
0048               T6_ETH_HDR_LEN_G(be32_to_cpu(req->hdr_len));
0049     int ip_len = (CHELSIO_CHIP_VERSION(type) <= CHELSIO_T5) ?
0050              IP_HDR_LEN_G(be32_to_cpu(req->hdr_len)) :
0051              T6_IP_HDR_LEN_G(be32_to_cpu(req->hdr_len));
0052     struct iphdr *ip = (struct iphdr *)((u8 *)(req + 1) + eth_len);
0053     struct ipv6hdr *ip6 = (struct ipv6hdr *)((u8 *)(req + 1) + eth_len);
0054     struct tcphdr *tcp = (struct tcphdr *)
0055                  ((u8 *)(req + 1) + eth_len + ip_len);
0056
0057     if (ip->version == 4) {
0058         pr_debug("%s saddr 0x%x daddr 0x%x sport %u dport %u\n",
0059              __func__, ntohl(ip->saddr), ntohl(ip->daddr),
0060              ntohs(tcp->source), ntohs(tcp->dest));
0061         *iptype = 4;
0062         memcpy(peer_ip, &ip->saddr, 4);
0063         memcpy(local_ip, &ip->daddr, 4);
0064     } else {
0065         pr_debug("%s saddr %pI6 daddr %pI6 sport %u dport %u\n",
0066              __func__, ip6->saddr.s6_addr, ip6->daddr.s6_addr,
0067              ntohs(tcp->source), ntohs(tcp->dest));
0068         *iptype = 6;
0069         memcpy(peer_ip, ip6->saddr.s6_addr, 16);
0070         memcpy(local_ip, ip6->daddr.s6_addr, 16);
0071     }
0072     *peer_port = tcp->source;
0073     *local_port = tcp->dest;
0074 }
0075 EXPORT_SYMBOL(cxgb_get_4tuple);
0076
0077 static bool
0078 cxgb_our_interface(struct cxgb4_lld_info *lldi,
0079            struct net_device *(*get_real_dev)(struct net_device *),
0080            struct net_device *egress_dev)
0081 {
0082     int i;
0083
0084     egress_dev = get_real_dev(egress_dev);
0085     for (i = 0; i < lldi->nports; i++)
0086         if (lldi->ports[i] == egress_dev)
0087             return true;
0088     return false;
0089 }
0090
0091 struct dst_entry *
0092 cxgb_find_route(struct cxgb4_lld_info *lldi,
0093         struct net_device *(*get_real_dev)(struct net_device *),
0094         __be32 local_ip, __be32 peer_ip, __be16 local_port,
0095         __be16 peer_port, u8 tos)
0096 {
0097     struct rtable *rt;
0098     struct flowi4 fl4;
0099     struct neighbour *n;
0100
0101     rt = ip_route_output_ports(&init_net, &fl4, NULL, peer_ip, local_ip,
0102                    peer_port, local_port, IPPROTO_TCP,
0103                    tos & ~INET_ECN_MASK, 0);
0104     if (IS_ERR(rt))
0105         return NULL;
0106     n = dst_neigh_lookup(&rt->dst, &peer_ip);
0107     if (!n)
0108         return NULL;
0109     if (!cxgb_our_interface(lldi, get_real_dev, n->dev) &&
0110         !(n->dev->flags & IFF_LOOPBACK)) {
0111         neigh_release(n);
0112         dst_release(&rt->dst);
0113         return NULL;
0114     }
0115     neigh_release(n);
0116     return &rt->dst;
0117 }
0118 EXPORT_SYMBOL(cxgb_find_route);
0119
0120 struct dst_entry *
0121 cxgb_find_route6(struct cxgb4_lld_info *lldi,
0122          struct net_device *(*get_real_dev)(struct net_device *),
0123          __u8 *local_ip, __u8 *peer_ip, __be16 local_port,
0124          __be16 peer_port, u8 tos, __u32 sin6_scope_id)
0125 {
0126     struct dst_entry *dst = NULL;
0127
0128     if (IS_ENABLED(CONFIG_IPV6)) {
0129         struct flowi6 fl6;
0130
0131         memset(&fl6, 0, sizeof(fl6));
0132         memcpy(&fl6.daddr, peer_ip, 16);
0133         memcpy(&fl6.saddr, local_ip, 16);
0134         if (ipv6_addr_type(&fl6.daddr) & IPV6_ADDR_LINKLOCAL)
0135             fl6.flowi6_oif = sin6_scope_id;
0136         dst = ip6_route_output(&init_net, NULL, &fl6);
0137         if (dst->error ||
0138             (!cxgb_our_interface(lldi, get_real_dev,
0139                      ip6_dst_idev(dst)->dev) &&
0140              !(ip6_dst_idev(dst)->dev->flags & IFF_LOOPBACK))) {
0141             dst_release(dst);
0142             return NULL;
0143         }
0144     }
0145
0146     return dst;
0147 }
0148 EXPORT_SYMBOL(cxgb_find_route6);