[DECNET] address: Convert to new netlink interface
Extends the netlink interface to support the __le16 type and converts address addition, deletion and, dumping to use the new netlink interface. Fixes multiple occasions of possible illegal memory references due to not validated netlink attributes. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>hifive-unleashed-5.1
Thomas Graf
David S. Miller
parent
b020b942cd
commit
4a89c2562c
|
|
@ -829,6 +829,9 @@ static inline int nla_put_msecs(struct sk_buff *skb, int attrtype,
|
|||
#define NLA_PUT_U16(skb, attrtype, value) \
|
||||
NLA_PUT_TYPE(skb, u16, attrtype, value)
|
||||
|
||||
#define NLA_PUT_LE16(skb, attrtype, value) \
|
||||
NLA_PUT_TYPE(skb, __le16, attrtype, value)
|
||||
|
||||
#define NLA_PUT_U32(skb, attrtype, value) \
|
||||
NLA_PUT_TYPE(skb, u32, attrtype, value)
|
||||
|
||||
|
|
@ -874,6 +877,15 @@ static inline u16 nla_get_u16(struct nlattr *nla)
|
|||
return *(u16 *) nla_data(nla);
|
||||
}
|
||||
|
||||
/**
|
||||
* nla_get_le16 - return payload of __le16 attribute
|
||||
* @nla: __le16 netlink attribute
|
||||
*/
|
||||
static inline __le16 nla_get_le16(struct nlattr *nla)
|
||||
{
|
||||
return *(__le16 *) nla_data(nla);
|
||||
}
|
||||
|
||||
/**
|
||||
* nla_get_u8 - return payload of u8 attribute
|
||||
* @nla: u8 netlink attribute
|
||||
|
|
|
|||
|
|
@ -645,41 +645,62 @@ static struct dn_dev *dn_dev_by_index(int ifindex)
|
|||
return dn_dev;
|
||||
}
|
||||
|
||||
static int dn_dev_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
||||
static struct nla_policy dn_ifa_policy[IFA_MAX+1] __read_mostly = {
|
||||
[IFA_ADDRESS] = { .type = NLA_U16 },
|
||||
[IFA_LOCAL] = { .type = NLA_U16 },
|
||||
[IFA_LABEL] = { .type = NLA_STRING,
|
||||
.len = IFNAMSIZ - 1 },
|
||||
};
|
||||
|
||||
static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
||||
{
|
||||
struct rtattr **rta = arg;
|
||||
struct nlattr *tb[IFA_MAX+1];
|
||||
struct dn_dev *dn_db;
|
||||
struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
|
||||
struct ifaddrmsg *ifm;
|
||||
struct dn_ifaddr *ifa, **ifap;
|
||||
int err = -EADDRNOTAVAIL;
|
||||
|
||||
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
|
||||
if (err < 0)
|
||||
goto errout;
|
||||
|
||||
ifm = nlmsg_data(nlh);
|
||||
if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
|
||||
return -EADDRNOTAVAIL;
|
||||
goto errout;
|
||||
|
||||
for(ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next) {
|
||||
void *tmp = rta[IFA_LOCAL-1];
|
||||
if ((tmp && memcmp(RTA_DATA(tmp), &ifa->ifa_local, 2)) ||
|
||||
(rta[IFA_LABEL-1] && rtattr_strcmp(rta[IFA_LABEL-1], ifa->ifa_label)))
|
||||
for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
|
||||
if (tb[IFA_LOCAL] &&
|
||||
nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
|
||||
continue;
|
||||
|
||||
if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
|
||||
continue;
|
||||
|
||||
dn_dev_del_ifa(dn_db, ifap, 1);
|
||||
return 0;
|
||||
}
|
||||
|
||||
return -EADDRNOTAVAIL;
|
||||
errout:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int dn_dev_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
||||
static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
||||
{
|
||||
struct rtattr **rta = arg;
|
||||
struct nlattr *tb[IFA_MAX+1];
|
||||
struct net_device *dev;
|
||||
struct dn_dev *dn_db;
|
||||
struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
|
||||
struct ifaddrmsg *ifm;
|
||||
struct dn_ifaddr *ifa;
|
||||
int rv;
|
||||
int err;
|
||||
|
||||
if (rta[IFA_LOCAL-1] == NULL)
|
||||
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
if (tb[IFA_LOCAL] == NULL)
|
||||
return -EINVAL;
|
||||
|
||||
ifm = nlmsg_data(nlh);
|
||||
if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL)
|
||||
return -ENODEV;
|
||||
|
||||
|
|
@ -693,22 +714,25 @@ static int dn_dev_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *a
|
|||
if ((ifa = dn_dev_alloc_ifa()) == NULL)
|
||||
return -ENOBUFS;
|
||||
|
||||
if (!rta[IFA_ADDRESS - 1])
|
||||
rta[IFA_ADDRESS - 1] = rta[IFA_LOCAL - 1];
|
||||
memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL-1]), 2);
|
||||
memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS-1]), 2);
|
||||
if (tb[IFA_ADDRESS] == NULL)
|
||||
tb[IFA_ADDRESS] = tb[IFA_LOCAL];
|
||||
|
||||
ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
|
||||
ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
|
||||
ifa->ifa_flags = ifm->ifa_flags;
|
||||
ifa->ifa_scope = ifm->ifa_scope;
|
||||
ifa->ifa_dev = dn_db;
|
||||
if (rta[IFA_LABEL-1])
|
||||
rtattr_strlcpy(ifa->ifa_label, rta[IFA_LABEL-1], IFNAMSIZ);
|
||||
|
||||
if (tb[IFA_LABEL])
|
||||
nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
|
||||
else
|
||||
memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
|
||||
|
||||
rv = dn_dev_insert_ifa(dn_db, ifa);
|
||||
if (rv)
|
||||
err = dn_dev_insert_ifa(dn_db, ifa);
|
||||
if (err)
|
||||
dn_dev_free_ifa(ifa);
|
||||
return rv;
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static inline size_t dn_ifaddr_nlmsg_size(void)
|
||||
|
|
@ -719,34 +743,34 @@ static inline size_t dn_ifaddr_nlmsg_size(void)
|
|||
+ nla_total_size(2); /* IFA_LOCAL */
|
||||
}
|
||||
|
||||
static int dn_dev_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
|
||||
u32 pid, u32 seq, int event, unsigned int flags)
|
||||
static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
|
||||
u32 pid, u32 seq, int event, unsigned int flags)
|
||||
{
|
||||
struct ifaddrmsg *ifm;
|
||||
struct nlmsghdr *nlh;
|
||||
unsigned char *b = skb->tail;
|
||||
|
||||
nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
|
||||
ifm = NLMSG_DATA(nlh);
|
||||
nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
|
||||
if (nlh == NULL)
|
||||
return -ENOBUFS;
|
||||
|
||||
ifm = nlmsg_data(nlh);
|
||||
ifm->ifa_family = AF_DECnet;
|
||||
ifm->ifa_prefixlen = 16;
|
||||
ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
|
||||
ifm->ifa_scope = ifa->ifa_scope;
|
||||
ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
|
||||
if (ifa->ifa_address)
|
||||
RTA_PUT(skb, IFA_ADDRESS, 2, &ifa->ifa_address);
|
||||
if (ifa->ifa_local)
|
||||
RTA_PUT(skb, IFA_LOCAL, 2, &ifa->ifa_local);
|
||||
if (ifa->ifa_label[0])
|
||||
RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label);
|
||||
nlh->nlmsg_len = skb->tail - b;
|
||||
return skb->len;
|
||||
|
||||
nlmsg_failure:
|
||||
rtattr_failure:
|
||||
skb_trim(skb, b - skb->data);
|
||||
return -1;
|
||||
if (ifa->ifa_address)
|
||||
NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
|
||||
if (ifa->ifa_local)
|
||||
NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
|
||||
if (ifa->ifa_label[0])
|
||||
NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
|
||||
|
||||
return nlmsg_end(skb, nlh);
|
||||
|
||||
nla_put_failure:
|
||||
return nlmsg_cancel(skb, nlh);
|
||||
}
|
||||
|
||||
static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
|
||||
|
|
@ -758,7 +782,7 @@ static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
|
|||
if (skb == NULL)
|
||||
goto errout;
|
||||
|
||||
err = dn_dev_fill_ifaddr(skb, ifa, 0, 0, event, 0);
|
||||
err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
|
||||
/* failure implies BUG in dn_ifaddr_nlmsg_size() */
|
||||
BUG_ON(err < 0);
|
||||
|
||||
|
|
@ -768,39 +792,43 @@ errout:
|
|||
rtnl_set_sk_err(RTNLGRP_DECnet_IFADDR, err);
|
||||
}
|
||||
|
||||
static int dn_dev_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
|
||||
static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
|
||||
{
|
||||
int idx, dn_idx;
|
||||
int s_idx, s_dn_idx;
|
||||
int idx, dn_idx = 0, skip_ndevs, skip_naddr;
|
||||
struct net_device *dev;
|
||||
struct dn_dev *dn_db;
|
||||
struct dn_ifaddr *ifa;
|
||||
|
||||
s_idx = cb->args[0];
|
||||
s_dn_idx = dn_idx = cb->args[1];
|
||||
skip_ndevs = cb->args[0];
|
||||
skip_naddr = cb->args[1];
|
||||
|
||||
read_lock(&dev_base_lock);
|
||||
for(dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
|
||||
if (idx < s_idx)
|
||||
for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
|
||||
if (idx < skip_ndevs)
|
||||
continue;
|
||||
if (idx > s_idx)
|
||||
s_dn_idx = 0;
|
||||
else if (idx > skip_ndevs) {
|
||||
/* Only skip over addresses for first dev dumped
|
||||
* in this iteration (idx == skip_ndevs) */
|
||||
skip_naddr = 0;
|
||||
}
|
||||
|
||||
if ((dn_db = dev->dn_ptr) == NULL)
|
||||
continue;
|
||||
|
||||
for(ifa = dn_db->ifa_list, dn_idx = 0; ifa; ifa = ifa->ifa_next, dn_idx++) {
|
||||
if (dn_idx < s_dn_idx)
|
||||
for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
|
||||
ifa = ifa->ifa_next, dn_idx++) {
|
||||
if (dn_idx < skip_naddr)
|
||||
continue;
|
||||
|
||||
if (dn_dev_fill_ifaddr(skb, ifa,
|
||||
NETLINK_CB(cb->skb).pid,
|
||||
cb->nlh->nlmsg_seq,
|
||||
RTM_NEWADDR,
|
||||
NLM_F_MULTI) <= 0)
|
||||
if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
|
||||
cb->nlh->nlmsg_seq, RTM_NEWADDR,
|
||||
NLM_F_MULTI) < 0)
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
done:
|
||||
read_unlock(&dev_base_lock);
|
||||
|
||||
cb->args[0] = idx;
|
||||
cb->args[1] = dn_idx;
|
||||
|
||||
|
|
@ -1417,9 +1445,9 @@ static struct file_operations dn_dev_seq_fops = {
|
|||
|
||||
static struct rtnetlink_link dnet_rtnetlink_table[RTM_NR_MSGTYPES] =
|
||||
{
|
||||
[RTM_NEWADDR - RTM_BASE] = { .doit = dn_dev_rtm_newaddr, },
|
||||
[RTM_DELADDR - RTM_BASE] = { .doit = dn_dev_rtm_deladdr, },
|
||||
[RTM_GETADDR - RTM_BASE] = { .dumpit = dn_dev_dump_ifaddr, },
|
||||
[RTM_NEWADDR - RTM_BASE] = { .doit = dn_nl_newaddr, },
|
||||
[RTM_DELADDR - RTM_BASE] = { .doit = dn_nl_deladdr, },
|
||||
[RTM_GETADDR - RTM_BASE] = { .dumpit = dn_nl_dump_ifaddr, },
|
||||
#ifdef CONFIG_DECNET_ROUTER
|
||||
[RTM_NEWROUTE - RTM_BASE] = { .doit = dn_fib_rtm_newroute, },
|
||||
[RTM_DELROUTE - RTM_BASE] = { .doit = dn_fib_rtm_delroute, },
|
||||
|
|
|
|||
Loading…
Reference in New Issue