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libnetlink: add more attribute functions

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New functions to handle u8, u16, u32, u64 and string attribute types.
Use common code for all attribute wrappers.
This commit is contained in:
Stephen Hemminger 2011-12-23 10:43:54 -08:00
parent 6cf8398f5f
commit 2aa3dd29a7
2 changed files with 32 additions and 12 deletions
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6
include/libnetlink.h
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@ -50,7 +50,13 @@ extern int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
extern int rtnl_send(struct rtnl_handle *rth, const void *buf, int);
extern int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int);
extern int addattr(struct nlmsghdr *n, int maxlen, int type);
extern int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
extern int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
extern int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
extern int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
extern int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
extern int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, int alen);
extern int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
extern struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);

38
lib/libnetlink.c
View File

@ -530,20 +530,34 @@ int rtnl_from_file(FILE *rtnl, rtnl_filter_t handler,
}
}
int addattr(struct nlmsghdr *n, int maxlen, int type)
{
return addattr_l(n, maxlen, type, NULL, 0);
}
int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data)
{
return addattr_l(n, maxlen, type, &data, sizeof(__u8));
}
int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data)
{
return addattr_l(n, maxlen, type, &data, sizeof(__u16));
}
int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data)
{
int len = RTA_LENGTH(4);
struct rtattr *rta;
if (NLMSG_ALIGN(n->nlmsg_len) + len > maxlen) {
fprintf(stderr,"addattr32: Error! max allowed bound %d exceeded\n",maxlen);
return -1;
}
rta = NLMSG_TAIL(n);
rta->rta_type = type;
rta->rta_len = len;
memcpy(RTA_DATA(rta), &data, 4);
n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
return 0;
return addattr_l(n, maxlen, type, &data, sizeof(__u32));
}
int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data)
{
return addattr_l(n, maxlen, type, &data, sizeof(__u64));
}
int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *str)
{
return addattr_l(n, maxlen, type, str, strlen(str)+1);
}
int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data,