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decnet: Parse netlink attributes on our own

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decnet is the only subsystem left that is relying on the global
netlink attribute buffer rta_buf. It's horrible design and we
want to get rid of it.

This converts all of decnet to do implicit attribute parsing. It
also gets rid of the error prone struct dn_kern_rta.

Yes, the fib_magic() stuff is not pretty.

It's compiled tested but I need someone with appropriate hardware
to test the patch since I don't have access to it.

Cc: linux-decnet-user@lists.sourceforge.net
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf
2013-03-21 07:45:28 +00:00
committed by David S. Miller
parent 9b924dbd5e
commit 58d7d8f9b2
4 changed files with 160 additions and 148 deletions
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42
net/decnet/dn_table.c
View File

@@ -224,26 +224,27 @@ static struct dn_zone *dn_new_zone(struct dn_hash *table, int z)
}
static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct dn_kern_rta *rta, struct dn_fib_info *fi)
static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct nlattr *attrs[], struct dn_fib_info *fi)
{
struct rtnexthop *nhp;
int nhlen;
if (rta->rta_priority && *rta->rta_priority != fi->fib_priority)
if (attrs[RTA_PRIORITY] &&
nla_get_u32(attrs[RTA_PRIORITY]) != fi->fib_priority)
return 1;
if (rta->rta_oif || rta->rta_gw) {
if ((!rta->rta_oif || *rta->rta_oif == fi->fib_nh->nh_oif) &&
(!rta->rta_gw || memcmp(rta->rta_gw, &fi->fib_nh->nh_gw, 2) == 0))
if (attrs[RTA_OIF] || attrs[RTA_GATEWAY]) {
if ((!attrs[RTA_OIF] || nla_get_u32(attrs[RTA_OIF]) == fi->fib_nh->nh_oif) &&
(!attrs[RTA_GATEWAY] || nla_get_le16(attrs[RTA_GATEWAY]) != fi->fib_nh->nh_gw))
return 0;
return 1;
}
if (rta->rta_mp == NULL)
if (!attrs[RTA_MULTIPATH])
return 0;
nhp = RTA_DATA(rta->rta_mp);
nhlen = RTA_PAYLOAD(rta->rta_mp);
nhp = nla_data(attrs[RTA_MULTIPATH]);
nhlen = nla_len(attrs[RTA_MULTIPATH]);
for_nexthops(fi) {
int attrlen = nhlen - sizeof(struct rtnexthop);
@@ -254,7 +255,10 @@ static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct dn_kern
if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif)
return 1;
if (attrlen) {
gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
struct nlattr *gw_attr;
gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY);
gw = gw_attr ? nla_get_le16(gw_attr) : 0;
if (gw && gw != nh->nh_gw)
return 1;
@@ -517,7 +521,8 @@ out:
return skb->len;
}
static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct nlattr *attrs[],
struct nlmsghdr *n, struct netlink_skb_parms *req)
{
struct dn_hash *table = (struct dn_hash *)tb->data;
struct dn_fib_node *new_f, *f, **fp, **del_fp;
@@ -536,15 +541,14 @@ static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct
return -ENOBUFS;
dz_key_0(key);
if (rta->rta_dst) {
__le16 dst;
memcpy(&dst, rta->rta_dst, 2);
if (attrs[RTA_DST]) {
__le16 dst = nla_get_le16(attrs[RTA_DST]);
if (dst & ~DZ_MASK(dz))
return -EINVAL;
key = dz_key(dst, dz);
}
if ((fi = dn_fib_create_info(r, rta, n, &err)) == NULL)
if ((fi = dn_fib_create_info(r, attrs, n, &err)) == NULL)
return err;
if (dz->dz_nent > (dz->dz_divisor << 2) &&
@@ -654,7 +658,8 @@ out:
}
static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct nlattr *attrs[],
struct nlmsghdr *n, struct netlink_skb_parms *req)
{
struct dn_hash *table = (struct dn_hash*)tb->data;
struct dn_fib_node **fp, **del_fp, *f;
@@ -671,9 +676,8 @@ static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct
return -ESRCH;
dz_key_0(key);
if (rta->rta_dst) {
__le16 dst;
memcpy(&dst, rta->rta_dst, 2);
if (attrs[RTA_DST]) {
__le16 dst = nla_get_le16(attrs[RTA_DST]);
if (dst & ~DZ_MASK(dz))
return -EINVAL;
key = dz_key(dst, dz);
@@ -703,7 +707,7 @@ static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct
(r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) &&
(!r->rtm_protocol ||
fi->fib_protocol == r->rtm_protocol) &&
dn_fib_nh_match(r, n, rta, fi) == 0)
dn_fib_nh_match(r, n, attrs, fi) == 0)
del_fp = fp;
}