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IPROUTE2: RTNETLINK nested attributes

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This adds capability for iproute2 to send nested attributes to the
kernel, while maintaining backwards compatibility.

Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Patrick McHardy 2007-08-14 11:21:19 -07:00 committed by Stephen Hemminger
parent 80c05b0976
commit 2f90c9c0bb
2 changed files with 55 additions and 0 deletions
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9
include/libnetlink.h
View File

@ -39,15 +39,24 @@ extern int rtnl_send(struct rtnl_handle *rth, const char *buf, int);
extern int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 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);
extern int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
extern struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type, const void *data, int len);
extern int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
extern int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
extern int rta_addattr_l(struct rtattr *rta, int maxlen, int type, const void *data, int alen);
extern int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
extern int parse_rtattr_byindex(struct rtattr *tb[], int max, struct rtattr *rta, int len);
extern int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, int len);
#define parse_rtattr_nested(tb, max, rta) \
(parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
#define parse_rtattr_nested_compat(tb, max, rta, data, len) \
({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL; \
__parse_rtattr_nested_compat(tb, max, rta, len); })
extern int rtnl_listen(struct rtnl_handle *, rtnl_filter_t handler,
void *jarg);
extern int rtnl_from_file(FILE *, rtnl_filter_t handler,

46
lib/libnetlink.c
View File

@ -527,6 +527,39 @@ int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len)
return 0;
}
struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type)
{
struct rtattr *nest = NLMSG_TAIL(n);
addattr_l(n, maxlen, type, NULL, 0);
return nest;
}
int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest)
{
nest->rta_len = (void *)NLMSG_TAIL(n) - (void *)nest;
return n->nlmsg_len;
}
struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type,
const void *data, int len)
{
struct rtattr *start = NLMSG_TAIL(n);
addattr_l(n, maxlen, type, data, len);
addattr_nest(n, maxlen, type);
return start;
}
int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *start)
{
struct rtattr *nest = (void *)start + NLMSG_ALIGN(start->rta_len);
start->rta_len = (void *)NLMSG_TAIL(n) - (void *)start;
addattr_nest_end(n, nest);
return n->nlmsg_len;
}
int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data)
{
int len = RTA_LENGTH(4);
@ -589,3 +622,16 @@ int parse_rtattr_byindex(struct rtattr *tb[], int max, struct rtattr *rta, int l
fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", len, rta->rta_len);
return i;
}
int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta,
int len)
{
if (RTA_PAYLOAD(rta) < len)
return -1;
if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) {
rta = RTA_DATA(rta) + RTA_ALIGN(len);
return parse_rtattr_nested(tb, max, rta);
}
memset(tb, 0, sizeof(struct rtattr *) * max);
return 0;
}