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mctp: replace mctp_address_ok with more fine-grained helpers

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Currently, we have mctp_address_ok(), which checks if an EID is in the
"valid" range of 8-254 inclusive. However, 0 and 255 may also be valid
addresses, depending on context. 0 is the NULL EID, which may be set
when physical addressing is used. 255 is valid as a destination address
for broadcasts.

This change renames mctp_address_ok to mctp_address_unicast, and adds
similar helpers for broadcast and null EIDs, which will be used in an
upcoming commit.

Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jeremy Kerr 2022-02-18 12:25:53 +08:00 committed by Jakub Kicinski
parent 47f0bd5032
commit cb196b7259
4 changed files with 14 additions and 4 deletions
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12
include/net/mctp.h
View File

@ -40,11 +40,21 @@ struct mctp_hdr {
#define MCTP_INITIAL_DEFAULT_NET 1
static inline bool mctp_address_ok(mctp_eid_t eid)
static inline bool mctp_address_unicast(mctp_eid_t eid)
{
return eid >= 8 && eid < 255;
}
static inline bool mctp_address_broadcast(mctp_eid_t eid)
{
return eid == 255;
}
static inline bool mctp_address_null(mctp_eid_t eid)
{
return eid == 0;
}
static inline bool mctp_address_matches(mctp_eid_t match, mctp_eid_t eid)
{
return match == eid || match == MCTP_ADDR_ANY;

2
net/mctp/device.c
View File

@ -209,7 +209,7 @@ static int mctp_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
if (!mdev)
return -ENODEV;
if (!mctp_address_ok(addr->s_addr))
if (!mctp_address_unicast(addr->s_addr))
return -EINVAL;
/* Prevent duplicates. Under RTNL so don't need to lock for reading */

2
net/mctp/neigh.c
View File

@ -143,7 +143,7 @@ static int mctp_rtm_newneigh(struct sk_buff *skb, struct nlmsghdr *nlh,
}
eid = nla_get_u8(tb[NDA_DST]);
if (!mctp_address_ok(eid)) {
if (!mctp_address_unicast(eid)) {
NL_SET_ERR_MSG(extack, "Invalid neighbour EID");
return -EINVAL;
}

2
net/mctp/route.c
View File

@ -962,7 +962,7 @@ static int mctp_route_add(struct mctp_dev *mdev, mctp_eid_t daddr_start,
struct net *net = dev_net(mdev->dev);
struct mctp_route *rt, *ert;
if (!mctp_address_ok(daddr_start))
if (!mctp_address_unicast(daddr_start))
return -EINVAL;
if (daddr_extent > 0xff || daddr_start + daddr_extent >= 255)