[PATCH iproute2] ip xfrm: policy: support policies with IF_ID in get/delete/deleteall

[Eyal Birger]

The XFRMA_IF_ID attribute is set in policies for them to be
associated with an XFRM interface (4.19+).

Add support for getting/deleting policies with this attribute.

For supporting 'deleteall' the XFRMA_IF_ID attribute needs to be
explicitly copied.

Signed-off-by: Eyal Birger <eyal.bir...@gmail.com>
---
 ip/xfrm_policy.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/ip/xfrm_policy.c b/ip/xfrm_policy.c
index d3c706d3..7cc00e7c 100644
--- a/ip/xfrm_policy.c
+++ b/ip/xfrm_policy.c
@@ -59,6 +59,7 @@ static void usage(void)
                "       [ if_id IF_ID ] [ LIMIT-LIST ] [ TMPL-LIST ]\n"
                "Usage: ip xfrm policy { delete | get } { SELECTOR | index 
INDEX } dir DIR\n"
                "       [ ctx CTX ] [ mark MARK [ mask MASK ] ] [ ptype PTYPE 
]\n"
+               "       [ if_id IF_ID ]\n"
                "Usage: ip xfrm policy { deleteall | list } [ nosock ] [ 
SELECTOR ] [ dir DIR ]\n"
                "       [ index INDEX ] [ ptype PTYPE ] [ action ACTION ] [ 
priority PRIORITY ]\n"
                "       [ flag FLAG-LIST ]\n"
@@ -582,6 +583,8 @@ static int xfrm_policy_get_or_delete(int argc, char **argv, 
int delete,
                struct xfrm_user_sec_ctx sctx;
                char    str[CTX_BUF_SIZE];
        } ctx = {};
+       bool is_if_id_set = false;
+       __u32 if_id = 0;
 
        while (argc > 0) {
                if (strcmp(*argv, "dir") == 0) {
@@ -619,7 +622,11 @@ static int xfrm_policy_get_or_delete(int argc, char 
**argv, int delete,
 
                        NEXT_ARG();
                        xfrm_policy_ptype_parse(&upt.type, &argc, &argv);
-
+               } else if (strcmp(*argv, "if_id") == 0) {
+                       NEXT_ARG();
+                       if (get_u32(&if_id, *argv, 0))
+                               invarg("IF_ID value is invalid", *argv);
+                       is_if_id_set = true;
                } else {
                        if (selp)
                                invarg("unknown", *argv);
@@ -669,6 +676,9 @@ static int xfrm_policy_get_or_delete(int argc, char **argv, 
int delete,
                          (void *)&ctx, ctx.sctx.len);
        }
 
+       if (is_if_id_set)
+               addattr32(&req.n, sizeof(req.buf), XFRMA_IF_ID, if_id);
+
        if (rtnl_talk(&rth, &req.n, answer) < 0)
                exit(2);
 
@@ -767,6 +777,11 @@ static int xfrm_policy_keep(struct nlmsghdr *n, void *arg)
                }
        }
 
+       if (tb[XFRMA_IF_ID]) {
+               addattr32(new_n, xb->size, XFRMA_IF_ID,
+                         rta_getattr_u32(tb[XFRMA_IF_ID]));
+       }
+
        xb->offset += new_n->nlmsg_len;
        xb->nlmsg_count++;
 
-- 
2.25.1