drivers/net/ethernet/chelsio/libcxgb/libcxgb_cm.c

   1 /*
   2  * Copyright (c) 2016 Chelsio Communications, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/tcp.h>
  34 #include <linux/ipv6.h>
  35 #include <net/inet_ecn.h>
  36 #include <net/route.h>
  37 #include <net/ip6_route.h>
  38
  39 #include "libcxgb_cm.h"
  40
  41 void
  42 cxgb_get_4tuple(struct cpl_pass_accept_req *req, enum chip_type type,
  43                 int *iptype, __u8 *local_ip, __u8 *peer_ip,
  44                 __be16 *local_port, __be16 *peer_port)
  45 {
  46         int eth_len = (CHELSIO_CHIP_VERSION(type) <= CHELSIO_T5) ?
  47                       ETH_HDR_LEN_G(be32_to_cpu(req->hdr_len)) :
  48                       T6_ETH_HDR_LEN_G(be32_to_cpu(req->hdr_len));
  49         int ip_len = (CHELSIO_CHIP_VERSION(type) <= CHELSIO_T5) ?
  50                      IP_HDR_LEN_G(be32_to_cpu(req->hdr_len)) :
  51                      T6_IP_HDR_LEN_G(be32_to_cpu(req->hdr_len));
  52         struct iphdr *ip = (struct iphdr *)((u8 *)(req + 1) + eth_len);
  53         struct ipv6hdr *ip6 = (struct ipv6hdr *)((u8 *)(req + 1) + eth_len);
  54         struct tcphdr *tcp = (struct tcphdr *)
  55                              ((u8 *)(req + 1) + eth_len + ip_len);
  56
  57         if (ip->version == 4) {
  58                 pr_debug("%s saddr 0x%x daddr 0x%x sport %u dport %u\n",
  59                          __func__, ntohl(ip->saddr), ntohl(ip->daddr),
  60                          ntohs(tcp->source), ntohs(tcp->dest));
  61                 *iptype = 4;
  62                 memcpy(peer_ip, &ip->saddr, 4);
  63                 memcpy(local_ip, &ip->daddr, 4);
  64         } else {
  65                 pr_debug("%s saddr %pI6 daddr %pI6 sport %u dport %u\n",
  66                          __func__, ip6->saddr.s6_addr, ip6->daddr.s6_addr,
  67                          ntohs(tcp->source), ntohs(tcp->dest));
  68                 *iptype = 6;
  69                 memcpy(peer_ip, ip6->saddr.s6_addr, 16);
  70                 memcpy(local_ip, ip6->daddr.s6_addr, 16);
  71         }
  72         *peer_port = tcp->source;
  73         *local_port = tcp->dest;
  74 }
  75 EXPORT_SYMBOL(cxgb_get_4tuple);
  76
  77 static bool
  78 cxgb_our_interface(struct cxgb4_lld_info *lldi,
  79                    struct net_device *(*get_real_dev)(struct net_device *),
  80                    struct net_device *egress_dev)
  81 {
  82         int i;
  83
  84         egress_dev = get_real_dev(egress_dev);
  85         for (i = 0; i < lldi->nports; i++)
  86                 if (lldi->ports[i] == egress_dev)
  87                         return true;
  88         return false;
  89 }
  90
  91 struct dst_entry *
  92 cxgb_find_route(struct cxgb4_lld_info *lldi,
  93                 struct net_device *(*get_real_dev)(struct net_device *),
  94                 __be32 local_ip, __be32 peer_ip, __be16 local_port,
  95                 __be16 peer_port, u8 tos)
  96 {
  97         struct rtable *rt;
  98         struct flowi4 fl4;
  99         struct neighbour *n;
 100
 101         rt = ip_route_output_ports(&init_net, &fl4, NULL, peer_ip, local_ip,
 102                                    peer_port, local_port, IPPROTO_TCP,
 103                                    tos & ~INET_ECN_MASK, 0);
 104         if (IS_ERR(rt))
 105                 return NULL;
 106         n = dst_neigh_lookup(&rt->dst, &peer_ip);
 107         if (!n)
 108                 return NULL;
 109         if (!cxgb_our_interface(lldi, get_real_dev, n->dev) &&
 110             !(n->dev->flags & IFF_LOOPBACK)) {
 111                 neigh_release(n);
 112                 dst_release(&rt->dst);
 113                 return NULL;
 114         }
 115         neigh_release(n);
 116         return &rt->dst;
 117 }
 118 EXPORT_SYMBOL(cxgb_find_route);
 119
 120 struct dst_entry *
 121 cxgb_find_route6(struct cxgb4_lld_info *lldi,
 122                  struct net_device *(*get_real_dev)(struct net_device *),
 123                  __u8 *local_ip, __u8 *peer_ip, __be16 local_port,
 124                  __be16 peer_port, u8 tos, __u32 sin6_scope_id)
 125 {
 126         struct dst_entry *dst = NULL;
 127
 128         if (IS_ENABLED(CONFIG_IPV6)) {
 129                 struct flowi6 fl6;
 130
 131                 memset(&fl6, 0, sizeof(fl6));
 132                 memcpy(&fl6.daddr, peer_ip, 16);
 133                 memcpy(&fl6.saddr, local_ip, 16);
 134                 if (ipv6_addr_type(&fl6.daddr) & IPV6_ADDR_LINKLOCAL)
 135                         fl6.flowi6_oif = sin6_scope_id;
 136                 dst = ip6_route_output(&init_net, NULL, &fl6);
 137                 if (dst->error ||
 138                     (!cxgb_our_interface(lldi, get_real_dev,
 139                                          ip6_dst_idev(dst)->dev) &&
 140                      !(ip6_dst_idev(dst)->dev->flags & IFF_LOOPBACK))) {
 141                         dst_release(dst);
 142                         return NULL;
 143                 }
 144         }
 145
 146         return dst;
 147 }
 148 EXPORT_SYMBOL(cxgb_find_route6);