drivers/s390/net/qeth_l3.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *    Copyright IBM Corp. 2007
   4  *    Author(s): Utz Bacher <utz.bacher@de.ibm.com>,
   5  *               Frank Pavlic <fpavlic@de.ibm.com>,
   6  *               Thomas Spatzier <tspat@de.ibm.com>,
   7  *               Frank Blaschka <frank.blaschka@de.ibm.com>
   8  */
   9
  10 #ifndef __QETH_L3_H__
  11 #define __QETH_L3_H__
  12
  13 #include "qeth_core.h"
  14 #include <linux/hashtable.h>
  15
  16 enum qeth_ip_types {
  17         QETH_IP_TYPE_NORMAL,
  18         QETH_IP_TYPE_VIPA,
  19         QETH_IP_TYPE_RXIP,
  20 };
  21
  22 struct qeth_ipaddr {
  23         struct hlist_node hnode;
  24         enum qeth_ip_types type;
  25         u8 is_multicast:1;
  26         u8 disp_flag:2;
  27         u8 ipato:1;                     /* ucast only */
  28
  29         /* is changed only for normal ip addresses
  30          * for non-normal addresses it always is  1
  31          */
  32         int  ref_counter;
  33         enum qeth_prot_versions proto;
  34         union {
  35                 struct {
  36                         __be32 addr;
  37                         __be32 mask;
  38                 } a4;
  39                 struct {
  40                         struct in6_addr addr;
  41                         unsigned int pfxlen;
  42                 } a6;
  43         } u;
  44 };
  45
  46 static inline void qeth_l3_init_ipaddr(struct qeth_ipaddr *addr,
  47                                        enum qeth_ip_types type,
  48                                        enum qeth_prot_versions proto)
  49 {
  50         memset(addr, 0, sizeof(*addr));
  51         addr->type = type;
  52         addr->proto = proto;
  53         addr->disp_flag = QETH_DISP_ADDR_DO_NOTHING;
  54         addr->ref_counter = 1;
  55 }
  56
  57 static inline bool qeth_l3_addr_match_ip(struct qeth_ipaddr *a1,
  58                                          struct qeth_ipaddr *a2)
  59 {
  60         if (a1->proto != a2->proto)
  61                 return false;
  62         if (a1->proto == QETH_PROT_IPV6)
  63                 return ipv6_addr_equal(&a1->u.a6.addr, &a2->u.a6.addr);
  64         return a1->u.a4.addr == a2->u.a4.addr;
  65 }
  66
  67 static inline bool qeth_l3_addr_match_all(struct qeth_ipaddr *a1,
  68                                           struct qeth_ipaddr *a2)
  69 {
  70         /* Assumes that the pair was obtained via qeth_l3_addr_find_by_ip(),
  71          * so 'proto' and 'addr' match for sure.
  72          *
  73          * For ucast:
  74          * -    'mask'/'pfxlen' for RXIP/VIPA is always 0. For NORMAL, matching
  75          *      values are required to avoid mixups in takeover eligibility.
  76          *
  77          * For mcast,
  78          * -    'mask'/'pfxlen' is always 0.
  79          */
  80         if (a1->type != a2->type)
  81                 return false;
  82         if (a1->proto == QETH_PROT_IPV6)
  83                 return a1->u.a6.pfxlen == a2->u.a6.pfxlen;
  84         return a1->u.a4.mask == a2->u.a4.mask;
  85 }
  86
  87 static inline u32 qeth_l3_ipaddr_hash(struct qeth_ipaddr *addr)
  88 {
  89         if (addr->proto == QETH_PROT_IPV6)
  90                 return ipv6_addr_hash(&addr->u.a6.addr);
  91         else
  92                 return ipv4_addr_hash(addr->u.a4.addr);
  93 }
  94
  95 struct qeth_ipato_entry {
  96         struct list_head entry;
  97         enum qeth_prot_versions proto;
  98         char addr[16];
  99         unsigned int mask_bits;
 100 };
 101
 102 extern const struct attribute_group *qeth_l3_attr_groups[];
 103
 104 int qeth_l3_ipaddr_to_string(enum qeth_prot_versions proto, const u8 *addr,
 105                              char *buf);
 106 int qeth_l3_setrouting_v4(struct qeth_card *);
 107 int qeth_l3_setrouting_v6(struct qeth_card *);
 108 int qeth_l3_add_ipato_entry(struct qeth_card *, struct qeth_ipato_entry *);
 109 int qeth_l3_del_ipato_entry(struct qeth_card *card,
 110                             enum qeth_prot_versions proto, u8 *addr,
 111                             unsigned int mask_bits);
 112 void qeth_l3_update_ipato(struct qeth_card *card);
 113 int qeth_l3_modify_hsuid(struct qeth_card *card, bool add);
 114 int qeth_l3_modify_rxip_vipa(struct qeth_card *card, bool add, const u8 *ip,
 115                              enum qeth_ip_types type,
 116                              enum qeth_prot_versions proto);
 117
 118 #endif /* __QETH_L3_H__ */