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c5c48c58b2
Current code ("qeth_l3_ip_from_hash()") matches a queried address object
against objects in the IP table by IP address, Mask/Prefix Length and
MAC address ("qeth_l3_ipaddrs_is_equal()"). But what callers actually
require is either
a) "is this IP address registered" (ie. match by IP address only),
before adding a new address.
b) or "is this address object registered" (ie. match all relevant
attributes), before deleting an address.
Right now
1. the ADD path is too strict in its lookup, and eg. doesn't detect
conflicts between an existing NORMAL address and a new VIPA address
(because the NORMAL address will have mask != 0, while VIPA has
a mask == 0),
2. the DELETE path is not strict enough, and eg. allows del_rxip() to
delete a VIPA address as long as the IP address matches.
Fix all this by adding helpers (_addr_match_ip() and _addr_match_all())
that do the appropriate checking.
Note that the ADD path for NORMAL addresses is special, as qeth keeps
track of how many times such an address is in use (and there is no
immediate way of returning errors to the caller). So when a requested
NORMAL address _fully_ matches an existing one, it's not considered a
conflict and we merely increment the refcount.
Fixes: 5f78e29cee ("qeth: optimize IP handling in rx_mode callback")
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright IBM Corp. 2007
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* Author(s): Utz Bacher <utz.bacher@de.ibm.com>,
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* Frank Pavlic <fpavlic@de.ibm.com>,
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* Thomas Spatzier <tspat@de.ibm.com>,
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* Frank Blaschka <frank.blaschka@de.ibm.com>
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*/
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#ifndef __QETH_L3_H__
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#define __QETH_L3_H__
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#include "qeth_core.h"
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#include <linux/hashtable.h>
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#define QETH_SNIFF_AVAIL 0x0008
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struct qeth_ipaddr {
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struct hlist_node hnode;
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enum qeth_ip_types type;
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enum qeth_ipa_setdelip_flags set_flags;
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enum qeth_ipa_setdelip_flags del_flags;
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u8 is_multicast:1;
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u8 in_progress:1;
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u8 disp_flag:2;
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/* is changed only for normal ip addresses
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* for non-normal addresses it always is 1
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*/
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int ref_counter;
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enum qeth_prot_versions proto;
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unsigned char mac[ETH_ALEN];
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union {
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struct {
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unsigned int addr;
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unsigned int mask;
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} a4;
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struct {
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struct in6_addr addr;
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unsigned int pfxlen;
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} a6;
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} u;
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};
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static inline bool qeth_l3_addr_match_ip(struct qeth_ipaddr *a1,
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struct qeth_ipaddr *a2)
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{
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if (a1->proto != a2->proto)
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return false;
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if (a1->proto == QETH_PROT_IPV6)
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return ipv6_addr_equal(&a1->u.a6.addr, &a2->u.a6.addr);
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return a1->u.a4.addr == a2->u.a4.addr;
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}
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static inline bool qeth_l3_addr_match_all(struct qeth_ipaddr *a1,
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struct qeth_ipaddr *a2)
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{
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/* Assumes that the pair was obtained via qeth_l3_addr_find_by_ip(),
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* so 'proto' and 'addr' match for sure.
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*
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* For ucast:
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* - 'mac' is always 0.
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* - 'mask'/'pfxlen' for RXIP/VIPA is always 0. For NORMAL, matching
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* values are required to avoid mixups in takeover eligibility.
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*
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* For mcast,
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* - 'mac' is mapped from the IP, and thus always matches.
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* - 'mask'/'pfxlen' is always 0.
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*/
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if (a1->type != a2->type)
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return false;
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if (a1->proto == QETH_PROT_IPV6)
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return a1->u.a6.pfxlen == a2->u.a6.pfxlen;
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return a1->u.a4.mask == a2->u.a4.mask;
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}
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static inline u64 qeth_l3_ipaddr_hash(struct qeth_ipaddr *addr)
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{
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u64 ret = 0;
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u8 *point;
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if (addr->proto == QETH_PROT_IPV6) {
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point = (u8 *) &addr->u.a6.addr;
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ret = get_unaligned((u64 *)point) ^
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get_unaligned((u64 *) (point + 8));
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}
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if (addr->proto == QETH_PROT_IPV4) {
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point = (u8 *) &addr->u.a4.addr;
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ret = get_unaligned((u32 *) point);
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}
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return ret;
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}
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struct qeth_ipato_entry {
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struct list_head entry;
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enum qeth_prot_versions proto;
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char addr[16];
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int mask_bits;
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};
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extern const struct attribute_group *qeth_l3_attr_groups[];
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void qeth_l3_ipaddr_to_string(enum qeth_prot_versions, const __u8 *, char *);
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int qeth_l3_create_device_attributes(struct device *);
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void qeth_l3_remove_device_attributes(struct device *);
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int qeth_l3_setrouting_v4(struct qeth_card *);
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int qeth_l3_setrouting_v6(struct qeth_card *);
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int qeth_l3_add_ipato_entry(struct qeth_card *, struct qeth_ipato_entry *);
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int qeth_l3_del_ipato_entry(struct qeth_card *card,
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enum qeth_prot_versions proto, u8 *addr,
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int mask_bits);
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int qeth_l3_add_vipa(struct qeth_card *, enum qeth_prot_versions, const u8 *);
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int qeth_l3_del_vipa(struct qeth_card *card, enum qeth_prot_versions proto,
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const u8 *addr);
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int qeth_l3_add_rxip(struct qeth_card *, enum qeth_prot_versions, const u8 *);
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int qeth_l3_del_rxip(struct qeth_card *card, enum qeth_prot_versions proto,
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const u8 *addr);
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void qeth_l3_update_ipato(struct qeth_card *card);
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struct qeth_ipaddr *qeth_l3_get_addr_buffer(enum qeth_prot_versions);
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int qeth_l3_add_ip(struct qeth_card *, struct qeth_ipaddr *);
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int qeth_l3_delete_ip(struct qeth_card *, struct qeth_ipaddr *);
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#endif /* __QETH_L3_H__ */
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