[NET]: Fix fib_rules compatibility breakage
Based upon a patch from Patrick McHardy. The fib_rules netlink attribute policy introduced in 2.6.19 broke userspace compatibilty. When specifying a rule with "from all" or "to all", iproute adds a zero byte long netlink attribute, but the policy requires all addresses to have a size equal to sizeof(struct in_addr)/sizeof(struct in6_addr), resulting in a validation error. Check attribute length of FRA_SRC/FRA_DST in the generic framework by letting the family specific rules implementation provide the length of an address. Report an error if address length is non zero but no address attribute is provided. Fix actual bug by checking address length for non-zero instead of relying on availability of attribute. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>wifi-calibration
Thomas Graf
David S. Miller
parent
5f85813c33
commit
e1701c68c1
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@ -34,6 +34,7 @@ struct fib_rules_ops
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int family;
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struct list_head list;
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int rule_size;
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int addr_size;
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int (*action)(struct fib_rule *,
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struct flowi *, int,
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@ -152,6 +152,28 @@ out:
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EXPORT_SYMBOL_GPL(fib_rules_lookup);
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static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb,
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struct fib_rules_ops *ops)
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{
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int err = -EINVAL;
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if (frh->src_len)
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if (tb[FRA_SRC] == NULL ||
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frh->src_len > (ops->addr_size * 8) ||
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nla_len(tb[FRA_SRC]) != ops->addr_size)
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goto errout;
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if (frh->dst_len)
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if (tb[FRA_DST] == NULL ||
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frh->dst_len > (ops->addr_size * 8) ||
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nla_len(tb[FRA_DST]) != ops->addr_size)
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goto errout;
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err = 0;
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errout:
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return err;
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}
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int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
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{
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struct fib_rule_hdr *frh = nlmsg_data(nlh);
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@ -173,6 +195,10 @@ int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
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if (err < 0)
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goto errout;
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err = validate_rulemsg(frh, tb, ops);
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if (err < 0)
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goto errout;
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rule = kzalloc(ops->rule_size, GFP_KERNEL);
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if (rule == NULL) {
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err = -ENOMEM;
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@ -260,6 +286,10 @@ int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
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if (err < 0)
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goto errout;
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err = validate_rulemsg(frh, tb, ops);
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if (err < 0)
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goto errout;
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list_for_each_entry(rule, ops->rules_list, list) {
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if (frh->action && (frh->action != rule->action))
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continue;
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@ -109,8 +109,6 @@ errout:
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static struct nla_policy dn_fib_rule_policy[FRA_MAX+1] __read_mostly = {
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FRA_GENERIC_POLICY,
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[FRA_SRC] = { .type = NLA_U16 },
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[FRA_DST] = { .type = NLA_U16 },
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};
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static int dn_fib_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
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@ -133,7 +131,7 @@ static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
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int err = -EINVAL;
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struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
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if (frh->src_len > 16 || frh->dst_len > 16 || frh->tos)
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if (frh->tos)
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goto errout;
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if (rule->table == RT_TABLE_UNSPEC) {
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@ -150,10 +148,10 @@ static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
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}
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}
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if (tb[FRA_SRC])
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if (frh->src_len)
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r->src = nla_get_le16(tb[FRA_SRC]);
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if (tb[FRA_DST])
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if (frh->dst_len)
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r->dst = nla_get_le16(tb[FRA_DST]);
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r->src_len = frh->src_len;
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@ -176,10 +174,10 @@ static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
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if (frh->dst_len && (r->dst_len != frh->dst_len))
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return 0;
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if (tb[FRA_SRC] && (r->src != nla_get_le16(tb[FRA_SRC])))
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if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC])))
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return 0;
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if (tb[FRA_DST] && (r->dst != nla_get_le16(tb[FRA_DST])))
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if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST])))
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return 0;
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return 1;
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@ -249,6 +247,7 @@ int dn_fib_dump_rules(struct sk_buff *skb, struct netlink_callback *cb)
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static struct fib_rules_ops dn_fib_rules_ops = {
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.family = AF_DECnet,
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.rule_size = sizeof(struct dn_fib_rule),
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.addr_size = sizeof(u16),
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.action = dn_fib_rule_action,
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.match = dn_fib_rule_match,
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.configure = dn_fib_rule_configure,
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@ -171,8 +171,6 @@ static struct fib_table *fib_empty_table(void)
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static struct nla_policy fib4_rule_policy[FRA_MAX+1] __read_mostly = {
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FRA_GENERIC_POLICY,
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[FRA_SRC] = { .type = NLA_U32 },
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[FRA_DST] = { .type = NLA_U32 },
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[FRA_FLOW] = { .type = NLA_U32 },
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};
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@ -183,8 +181,7 @@ static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
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int err = -EINVAL;
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struct fib4_rule *rule4 = (struct fib4_rule *) rule;
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if (frh->src_len > 32 || frh->dst_len > 32 ||
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(frh->tos & ~IPTOS_TOS_MASK))
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if (frh->tos & ~IPTOS_TOS_MASK)
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goto errout;
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if (rule->table == RT_TABLE_UNSPEC) {
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@ -201,10 +198,10 @@ static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
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}
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}
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if (tb[FRA_SRC])
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if (frh->src_len)
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rule4->src = nla_get_be32(tb[FRA_SRC]);
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if (tb[FRA_DST])
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if (frh->dst_len)
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rule4->dst = nla_get_be32(tb[FRA_DST]);
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#ifdef CONFIG_NET_CLS_ROUTE
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@ -242,10 +239,10 @@ static int fib4_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
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return 0;
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#endif
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if (tb[FRA_SRC] && (rule4->src != nla_get_be32(tb[FRA_SRC])))
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if (frh->src_len && (rule4->src != nla_get_be32(tb[FRA_SRC])))
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return 0;
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if (tb[FRA_DST] && (rule4->dst != nla_get_be32(tb[FRA_DST])))
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if (frh->dst_len && (rule4->dst != nla_get_be32(tb[FRA_DST])))
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return 0;
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return 1;
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@ -309,6 +306,7 @@ static size_t fib4_rule_nlmsg_payload(struct fib_rule *rule)
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static struct fib_rules_ops fib4_rules_ops = {
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.family = AF_INET,
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.rule_size = sizeof(struct fib4_rule),
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.addr_size = sizeof(u32),
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.action = fib4_rule_action,
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.match = fib4_rule_match,
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.configure = fib4_rule_configure,
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@ -131,8 +131,6 @@ static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
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static struct nla_policy fib6_rule_policy[FRA_MAX+1] __read_mostly = {
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FRA_GENERIC_POLICY,
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[FRA_SRC] = { .len = sizeof(struct in6_addr) },
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[FRA_DST] = { .len = sizeof(struct in6_addr) },
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};
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static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
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@ -142,9 +140,6 @@ static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
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int err = -EINVAL;
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struct fib6_rule *rule6 = (struct fib6_rule *) rule;
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if (frh->src_len > 128 || frh->dst_len > 128)
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goto errout;
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if (rule->action == FR_ACT_TO_TBL) {
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if (rule->table == RT6_TABLE_UNSPEC)
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goto errout;
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@ -155,11 +150,11 @@ static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
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}
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}
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if (tb[FRA_SRC])
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if (frh->src_len)
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nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
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sizeof(struct in6_addr));
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if (tb[FRA_DST])
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if (frh->dst_len)
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nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
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sizeof(struct in6_addr));
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@ -186,11 +181,11 @@ static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
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if (frh->tos && (rule6->tclass != frh->tos))
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return 0;
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if (tb[FRA_SRC] &&
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if (frh->src_len &&
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nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
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return 0;
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if (tb[FRA_DST] &&
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if (frh->dst_len &&
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nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
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return 0;
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@ -240,6 +235,7 @@ static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
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static struct fib_rules_ops fib6_rules_ops = {
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.family = AF_INET6,
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.rule_size = sizeof(struct fib6_rule),
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.addr_size = sizeof(struct in6_addr),
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.action = fib6_rule_action,
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.match = fib6_rule_match,
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.configure = fib6_rule_configure,
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