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 #define QETH_SNIFF_AVAIL        0x0008
  17
  18 enum qeth_ip_types {
  19         QETH_IP_TYPE_NORMAL,
  20         QETH_IP_TYPE_VIPA,
  21         QETH_IP_TYPE_RXIP,
  22 };
  23
  24 struct qeth_ipaddr {
  25         struct hlist_node hnode;
  26         enum qeth_ip_types type;
  27         unsigned char mac[ETH_ALEN];
  28         u8 is_multicast:1;
  29         u8 in_progress:1;
  30         u8 disp_flag:2;
  31         u8 ipato:1;                     /* ucast only */
  32
  33         /* is changed only for normal ip addresses
  34          * for non-normal addresses it always is  1
  35          */
  36         int  ref_counter;
  37         enum qeth_prot_versions proto;
  38         union {
  39                 struct {
  40                         unsigned int addr;
  41                         unsigned int mask;
  42                 } a4;
  43                 struct {
  44                         struct in6_addr addr;
  45                         unsigned int pfxlen;
  46                 } a6;
  47         } u;
  48 };
  49
  50 static inline void qeth_l3_init_ipaddr(struct qeth_ipaddr *addr,
  51                                        enum qeth_ip_types type,
  52                                        enum qeth_prot_versions proto)
  53 {
  54         memset(addr, 0, sizeof(*addr));
  55         addr->type = type;
  56         addr->proto = proto;
  57         addr->disp_flag = QETH_DISP_ADDR_DO_NOTHING;
  58 }
  59
  60 static inline bool qeth_l3_addr_match_ip(struct qeth_ipaddr *a1,
  61                                          struct qeth_ipaddr *a2)
  62 {
  63         if (a1->proto != a2->proto)
  64                 return false;
  65         if (a1->proto == QETH_PROT_IPV6)
  66                 return ipv6_addr_equal(&a1->u.a6.addr, &a2->u.a6.addr);
  67         return a1->u.a4.addr == a2->u.a4.addr;
  68 }
  69
  70 static inline bool qeth_l3_addr_match_all(struct qeth_ipaddr *a1,
  71                                           struct qeth_ipaddr *a2)
  72 {
  73         /* Assumes that the pair was obtained via qeth_l3_addr_find_by_ip(),
  74          * so 'proto' and 'addr' match for sure.
  75          *
  76          * For ucast:
  77          * -    'mac' is always 0.
  78          * -    'mask'/'pfxlen' for RXIP/VIPA is always 0. For NORMAL, matching
  79          *      values are required to avoid mixups in takeover eligibility.
  80          *
  81          * For mcast,
  82          * -    'mac' is mapped from the IP, and thus always matches.
  83          * -    'mask'/'pfxlen' is always 0.
  84          */
  85         if (a1->type != a2->type)
  86                 return false;
  87         if (a1->proto == QETH_PROT_IPV6)
  88                 return a1->u.a6.pfxlen == a2->u.a6.pfxlen;
  89         return a1->u.a4.mask == a2->u.a4.mask;
  90 }
  91
  92 static inline  u64 qeth_l3_ipaddr_hash(struct qeth_ipaddr *addr)
  93 {
  94         u64  ret = 0;
  95         u8 *point;
  96
  97         if (addr->proto == QETH_PROT_IPV6) {
  98                 point = (u8 *) &addr->u.a6.addr;
  99                 ret = get_unaligned((u64 *)point) ^
 100                         get_unaligned((u64 *) (point + 8));
 101         }
 102         if (addr->proto == QETH_PROT_IPV4) {
 103                 point = (u8 *) &addr->u.a4.addr;
 104                 ret = get_unaligned((u32 *) point);
 105         }
 106         return ret;
 107 }
 108
 109 struct qeth_ipato_entry {
 110         struct list_head entry;
 111         enum qeth_prot_versions proto;
 112         char addr[16];
 113         int mask_bits;
 114 };
 115
 116 extern const struct attribute_group *qeth_l3_attr_groups[];
 117
 118 void qeth_l3_ipaddr_to_string(enum qeth_prot_versions, const __u8 *, char *);
 119 int qeth_l3_create_device_attributes(struct device *);
 120 void qeth_l3_remove_device_attributes(struct device *);
 121 int qeth_l3_setrouting_v4(struct qeth_card *);
 122 int qeth_l3_setrouting_v6(struct qeth_card *);
 123 int qeth_l3_add_ipato_entry(struct qeth_card *, struct qeth_ipato_entry *);
 124 int qeth_l3_del_ipato_entry(struct qeth_card *card,
 125                             enum qeth_prot_versions proto, u8 *addr,
 126                             int mask_bits);
 127 void qeth_l3_update_ipato(struct qeth_card *card);
 128 int qeth_l3_modify_hsuid(struct qeth_card *card, bool add);
 129 int qeth_l3_modify_rxip_vipa(struct qeth_card *card, bool add, const u8 *ip,
 130                              enum qeth_ip_types type,
 131                              enum qeth_prot_versions proto);
 132
 133 #endif /* __QETH_L3_H__ */