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sd-netlink: determine header size of genl message by using CTRL_ATTR_HDRSIZE attribute

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Fortunately, all genl families we currently use do not require additional
header size.
This commit is contained in:
Yu Watanabe
2021-08-29 18:10:47 +09:00
parent 52313394ba
commit 44f1072a9d
1 changed files with 8 additions and 2 deletions
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src/libsystemd/sd-netlink/netlink-genl.c
+8 -2
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@@ -17,6 +17,7 @@ typedef struct GenericNetlinkFamily {
uint16_t id; /* a.k.a nlmsg_type */
char *name;
uint32_t version;
uint32_t additional_header_size;
} GenericNetlinkFamily;
static const GenericNetlinkFamily nlctrl_static = {
@@ -119,6 +120,10 @@ static int genl_family_new(
if (r < 0)
return r;
r = sd_netlink_message_read_u32(message, CTRL_ATTR_HDRSIZE, &f->additional_header_size);
if (r < 0)
return r;
r = hashmap_ensure_put(&nl->genl_family_by_id, NULL, UINT_TO_PTR(f->id), f);
if (r < 0)
return r;
@@ -165,7 +170,8 @@ static int genl_message_new(
if (r < 0)
return r;
r = message_new_full(nl, family->id, type_system, sizeof(struct genlmsghdr), &m);
r = message_new_full(nl, family->id, type_system,
sizeof(struct genlmsghdr) + family->additional_header_size, &m);
if (r < 0)
return r;
@@ -287,7 +293,7 @@ int genl_get_type_system_and_header_size(
return r;
}
if (ret_header_size)
*ret_header_size = sizeof(struct genlmsghdr);
*ret_header_size = sizeof(struct genlmsghdr) + f->additional_header_size;
return 0;
}