bpf: convert sockmap field attach_bpf_fd2 to type

In the initial sockmap API we provided strparser and verdict programs
using a single attach command by extending the attach API with a the
attach_bpf_fd2 field.

However, if we add other programs in the future we will be adding a
field for every new possible type, attach_bpf_fd(3,4,..). This
seems a bit clumsy for an API. So lets push the programs using two
new type fields.

   BPF_SK_SKB_STREAM_PARSER
   BPF_SK_SKB_STREAM_VERDICT

This has the advantage of having a readable name and can easily be
extended in the future.

Updates to samples and sockmap included here also generalize tests
slightly to support upcoming patch for multiple map support.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Fixes: 174a79ff9515 ("bpf: sockmap with sk redirect support")
Suggested-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 830f472..c2cb1b5 100644 (file)
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -39,8 +39,6 @@ struct bpf_map_ops {
        void (*map_fd_put_ptr)(void *ptr);
        u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
        u32 (*map_fd_sys_lookup_elem)(void *ptr);
-       int (*map_attach)(struct bpf_map *map,
-                         struct bpf_prog *p1, struct bpf_prog *p2);
 };
 
 struct bpf_map {
@@ -387,11 +385,19 @@ static inline void __dev_map_flush(struct bpf_map *map)
 
 #if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL)
 struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key);
+int sock_map_attach_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type);
 #else
 static inline struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key)
 {
        return NULL;
 }
+
+static inline int sock_map_attach_prog(struct bpf_map *map,
+                                      struct bpf_prog *prog,
+                                      u32 type)
+{
+       return -EOPNOTSUPP;
+}
 #endif
 
 /* verifier prototypes for helper functions called from eBPF programs */

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 843818d..97227be 100644 (file)
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -136,7 +136,8 @@ enum bpf_attach_type {
        BPF_CGROUP_INET_EGRESS,
        BPF_CGROUP_INET_SOCK_CREATE,
        BPF_CGROUP_SOCK_OPS,
-       BPF_CGROUP_SMAP_INGRESS,
+       BPF_SK_SKB_STREAM_PARSER,
+       BPF_SK_SKB_STREAM_VERDICT,
        __MAX_BPF_ATTACH_TYPE
 };
 
@@ -224,7 +225,6 @@ union bpf_attr {
                __u32           attach_bpf_fd;  /* eBPF program to attach */
                __u32           attach_type;
                __u32           attach_flags;
-               __u32           attach_bpf_fd2;
        };
 
        struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */
@@ -580,14 +580,11 @@ union bpf_attr {
  *     @flags: reserved for future use
  *     Return: SK_REDIRECT
  *
- * int bpf_sock_map_update(skops, map, key, flags, map_flags)
+ * int bpf_sock_map_update(skops, map, key, flags)
  *     @skops: pointer to bpf_sock_ops
  *     @map: pointer to sockmap to update
  *     @key: key to insert/update sock in map
  *     @flags: same flags as map update elem
- *     @map_flags: sock map specific flags
- *        bit 1: Enable strparser
- *        other bits: reserved
  */
 #define __BPF_FUNC_MAPPER(FN)          \
        FN(unspec),                     \

diff --git a/kernel/bpf/sockmap.c b/kernel/bpf/sockmap.c
index 617c239..cf570d1 100644 (file)
--- a/kernel/bpf/sockmap.c
+++ b/kernel/bpf/sockmap.c
@@ -723,20 +723,24 @@ out:
        return err;
 }
 
-static int sock_map_attach_prog(struct bpf_map *map,
-                               struct bpf_prog *parse,
-                               struct bpf_prog *verdict)
+int sock_map_attach_prog(struct bpf_map *map, struct bpf_prog *prog, u32 type)
 {
        struct bpf_stab *stab = container_of(map, struct bpf_stab, map);
-       struct bpf_prog *_parse, *_verdict;
+       struct bpf_prog *orig;
 
-       _parse = xchg(&stab->bpf_parse, parse);
-       _verdict = xchg(&stab->bpf_verdict, verdict);
+       switch (type) {
+       case BPF_SK_SKB_STREAM_PARSER:
+               orig = xchg(&stab->bpf_parse, prog);
+               break;
+       case BPF_SK_SKB_STREAM_VERDICT:
+               orig = xchg(&stab->bpf_verdict, prog);
+               break;
+       default:
+               return -EOPNOTSUPP;
+       }
 
-       if (_parse)
-               bpf_prog_put(_parse);
-       if (_verdict)
-               bpf_prog_put(_verdict);
+       if (orig)
+               bpf_prog_put(orig);
 
        return 0;
 }
@@ -777,7 +781,6 @@ const struct bpf_map_ops sock_map_ops = {
        .map_get_next_key = sock_map_get_next_key,
        .map_update_elem = sock_map_update_elem,
        .map_delete_elem = sock_map_delete_elem,
-       .map_attach = sock_map_attach_prog,
 };
 
 BPF_CALL_5(bpf_sock_map_update, struct bpf_sock_ops_kern *, bpf_sock,

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 9378f3b..021a05d 100644 (file)
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -1093,12 +1093,12 @@ static int bpf_obj_get(const union bpf_attr *attr)
 
 #ifdef CONFIG_CGROUP_BPF
 
-#define BPF_PROG_ATTACH_LAST_FIELD attach_bpf_fd2
+#define BPF_PROG_ATTACH_LAST_FIELD attach_flags
 
-static int sockmap_get_from_fd(const union bpf_attr *attr, int ptype)
+static int sockmap_get_from_fd(const union bpf_attr *attr)
 {
-       struct bpf_prog *prog1, *prog2;
        int ufd = attr->target_fd;
+       struct bpf_prog *prog;
        struct bpf_map *map;
        struct fd f;
        int err;
@@ -1108,29 +1108,16 @@ static int sockmap_get_from_fd(const union bpf_attr *attr, int ptype)
        if (IS_ERR(map))
                return PTR_ERR(map);
 
-       if (!map->ops->map_attach) {
-               fdput(f);
-               return -EOPNOTSUPP;
-       }
-
-       prog1 = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
-       if (IS_ERR(prog1)) {
+       prog = bpf_prog_get_type(attr->attach_bpf_fd, BPF_PROG_TYPE_SK_SKB);
+       if (IS_ERR(prog)) {
                fdput(f);
-               return PTR_ERR(prog1);
-       }
-
-       prog2 = bpf_prog_get_type(attr->attach_bpf_fd2, ptype);
-       if (IS_ERR(prog2)) {
-               fdput(f);
-               bpf_prog_put(prog1);
-               return PTR_ERR(prog2);
+               return PTR_ERR(prog);
        }
 
-       err = map->ops->map_attach(map, prog1, prog2);
+       err = sock_map_attach_prog(map, prog, attr->attach_type);
        if (err) {
                fdput(f);
-               bpf_prog_put(prog1);
-               bpf_prog_put(prog2);
+               bpf_prog_put(prog);
                return err;
        }
 
@@ -1165,16 +1152,13 @@ static int bpf_prog_attach(const union bpf_attr *attr)
        case BPF_CGROUP_SOCK_OPS:
                ptype = BPF_PROG_TYPE_SOCK_OPS;
                break;
-       case BPF_CGROUP_SMAP_INGRESS:
-               ptype = BPF_PROG_TYPE_SK_SKB;
-               break;
+       case BPF_SK_SKB_STREAM_PARSER:
+       case BPF_SK_SKB_STREAM_VERDICT:
+               return sockmap_get_from_fd(attr);
        default:
                return -EINVAL;
        }
 
-       if (attr->attach_type == BPF_CGROUP_SMAP_INGRESS)
-               return sockmap_get_from_fd(attr, ptype);
-
        prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
        if (IS_ERR(prog))
                return PTR_ERR(prog);

diff --git a/samples/sockmap/sockmap_kern.c b/samples/sockmap/sockmap_kern.c
index 6ff986f..f9b38ef 100644 (file)
--- a/samples/sockmap/sockmap_kern.c
+++ b/samples/sockmap/sockmap_kern.c
@@ -82,8 +82,7 @@ int bpf_sockmap(struct bpf_sock_ops *skops)
                if (lport == 10000) {
                        ret = 1;
                        err = bpf_sock_map_update(skops, &sock_map, &ret,
-                                                 BPF_NOEXIST,
-                                                 BPF_SOCKMAP_STRPARSER);
+                                                 BPF_NOEXIST);
                        bpf_printk("passive(%i -> %i) map ctx update err: %d\n",
                                   lport, bpf_ntohl(rport), err);
                }
@@ -95,8 +94,7 @@ int bpf_sockmap(struct bpf_sock_ops *skops)
                if (bpf_ntohl(rport) == 10001) {
                        ret = 10;
                        err = bpf_sock_map_update(skops, &sock_map, &ret,
-                                                 BPF_NOEXIST,
-                                                 BPF_SOCKMAP_STRPARSER);
+                                                 BPF_NOEXIST);
                        bpf_printk("active(%i -> %i) map ctx update err: %d\n",
                                   lport, bpf_ntohl(rport), err);
                }

diff --git a/samples/sockmap/sockmap_user.c b/samples/sockmap/sockmap_user.c
index fb78f5a..7cc9d22 100644 (file)
--- a/samples/sockmap/sockmap_user.c
+++ b/samples/sockmap/sockmap_user.c
@@ -256,8 +256,16 @@ int main(int argc, char **argv)
        }
 
        /* Attach programs to sockmap */
-       err = __bpf_prog_attach(prog_fd[0], prog_fd[1], map_fd[0],
-                               BPF_CGROUP_SMAP_INGRESS, 0);
+       err = bpf_prog_attach(prog_fd[0], map_fd[0],
+                               BPF_SK_SKB_STREAM_PARSER, 0);
+       if (err) {
+               fprintf(stderr, "ERROR: bpf_prog_attach (sockmap): %d (%s)\n",
+                       err, strerror(errno));
+               return err;
+       }
+
+       err = bpf_prog_attach(prog_fd[1], map_fd[0],
+                               BPF_SK_SKB_STREAM_VERDICT, 0);
        if (err) {
                fprintf(stderr, "ERROR: bpf_prog_attach (sockmap): %d (%s)\n",
                        err, strerror(errno));

diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index f8f6377..09ac590 100644 (file)
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -136,7 +136,8 @@ enum bpf_attach_type {
        BPF_CGROUP_INET_EGRESS,
        BPF_CGROUP_INET_SOCK_CREATE,
        BPF_CGROUP_SOCK_OPS,
-       BPF_CGROUP_SMAP_INGRESS,
+       BPF_SK_SKB_STREAM_PARSER,
+       BPF_SK_SKB_STREAM_VERDICT,
        __MAX_BPF_ATTACH_TYPE
 };
 
@@ -227,7 +228,6 @@ union bpf_attr {
                __u32           attach_bpf_fd;  /* eBPF program to attach */
                __u32           attach_type;
                __u32           attach_flags;
-               __u32           attach_bpf_fd2;
        };
 
        struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */
@@ -572,14 +572,11 @@ union bpf_attr {
  *     @flags: reserved for future use
  *     Return: SK_REDIRECT
  *
- * int bpf_sock_map_update(skops, map, key, flags, map_flags)
+ * int bpf_sock_map_update(skops, map, key, flags)
  *     @skops: pointer to bpf_sock_ops
  *     @map: pointer to sockmap to update
  *     @key: key to insert/update sock in map
  *     @flags: same flags as map update elem
- *     @map_flags: sock map specific flags
- *        bit 1: Enable strparser
- *        other bits: reserved
  */
 #define __BPF_FUNC_MAPPER(FN)          \
        FN(unspec),                     \

diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index a071761..1d6907d 100644 (file)
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -235,28 +235,20 @@ int bpf_obj_get(const char *pathname)
        return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
 }
 
-int __bpf_prog_attach(int prog_fd1, int prog_fd2, int target_fd,
-                     enum bpf_attach_type type,
-                     unsigned int flags)
+int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
+                   unsigned int flags)
 {
        union bpf_attr attr;
 
        bzero(&attr, sizeof(attr));
        attr.target_fd     = target_fd;
-       attr.attach_bpf_fd = prog_fd1;
-       attr.attach_bpf_fd2 = prog_fd2;
+       attr.attach_bpf_fd = prog_fd;
        attr.attach_type   = type;
        attr.attach_flags  = flags;
 
        return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));
 }
 
-int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
-                   unsigned int flags)
-{
-       return __bpf_prog_attach(prog_fd, 0, target_fd, type, flags);
-}
-
 int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
 {
        union bpf_attr attr;

diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index 90e9d4e..b8ea584 100644 (file)
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -56,10 +56,6 @@ int bpf_obj_pin(int fd, const char *pathname);
 int bpf_obj_get(const char *pathname);
 int bpf_prog_attach(int prog_fd, int attachable_fd, enum bpf_attach_type type,
                    unsigned int flags);
-int __bpf_prog_attach(int prog1, int prog2,
-                     int attachable_fd,
-                     enum bpf_attach_type type,
-                     unsigned int flags);
 int bpf_prog_detach(int attachable_fd, enum bpf_attach_type type);
 int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size,
                      void *data_out, __u32 *size_out, __u32 *retval,

diff --git a/tools/testing/selftests/bpf/bpf_helpers.h b/tools/testing/selftests/bpf/bpf_helpers.h
index 98f3be2..36fb916 100644 (file)
--- a/tools/testing/selftests/bpf/bpf_helpers.h
+++ b/tools/testing/selftests/bpf/bpf_helpers.h
@@ -68,8 +68,7 @@ static int (*bpf_setsockopt)(void *ctx, int level, int optname, void *optval,
 static int (*bpf_sk_redirect_map)(void *map, int key, int flags) =
        (void *) BPF_FUNC_sk_redirect_map;
 static int (*bpf_sock_map_update)(void *map, void *key, void *value,
-                                 unsigned long long flags,
-                                 unsigned long long map_lags) =
+                                 unsigned long long flags) =
        (void *) BPF_FUNC_sock_map_update;
 
 

diff --git a/tools/testing/selftests/bpf/sockmap_parse_prog.c b/tools/testing/selftests/bpf/sockmap_parse_prog.c
index 8b54531..710f43f 100644 (file)
--- a/tools/testing/selftests/bpf/sockmap_parse_prog.c
+++ b/tools/testing/selftests/bpf/sockmap_parse_prog.c
@@ -30,7 +30,7 @@ int bpf_prog1(struct __sk_buff *skb)
         */
        d[0] = 1;
 
-       bpf_printk("data[0] = (%u): local_port %i remote %i\n",
+       bpf_printk("parse: data[0] = (%u): local_port %i remote %i\n",
                   d[0], lport, bpf_ntohl(rport));
        return skb->len;
 }

diff --git a/tools/testing/selftests/bpf/sockmap_verdict_prog.c b/tools/testing/selftests/bpf/sockmap_verdict_prog.c
index d5f9447..0573c1d 100644 (file)
--- a/tools/testing/selftests/bpf/sockmap_verdict_prog.c
+++ b/tools/testing/selftests/bpf/sockmap_verdict_prog.c
@@ -40,7 +40,7 @@ int bpf_prog2(struct __sk_buff *skb)
        d[6] = 0xe;
        d[7] = 0xf;
 
-       bpf_printk("data[0] = (%u): local_port %i remote %i\n",
+       bpf_printk("verdict: data[0] = (%u): local_port %i remote %i redirect 5\n",
                   d[0], lport, bpf_ntohl(rport));
        return bpf_sk_redirect_map(&sock_map, 5, 0);
 }

diff --git a/tools/testing/selftests/bpf/test_maps.c b/tools/testing/selftests/bpf/test_maps.c
index 40b2d1f..6df6e62 100644 (file)
--- a/tools/testing/selftests/bpf/test_maps.c
+++ b/tools/testing/selftests/bpf/test_maps.c
@@ -547,20 +547,26 @@ static void test_sockmap(int task, void *data)
                goto out_sockmap;
        }
 
-       /* Nothing attached so these should fail */
+       /* Test update without programs */
        for (i = 0; i < 6; i++) {
                err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_ANY);
-               if (!err) {
-                       printf("Failed invalid update sockmap '%i:%i'\n",
+               if (err) {
+                       printf("Failed noprog update sockmap '%i:%i'\n",
                               i, sfd[i]);
                        goto out_sockmap;
                }
        }
 
        /* Test attaching bad fds */
-       err = __bpf_prog_attach(-1, -2, fd, BPF_CGROUP_SMAP_INGRESS, 0);
+       err = bpf_prog_attach(-1, fd, BPF_SK_SKB_STREAM_PARSER, 0);
        if (!err) {
-               printf("Failed invalid prog attach\n");
+               printf("Failed invalid parser prog attach\n");
+               goto out_sockmap;
+       }
+
+       err = bpf_prog_attach(-1, fd, BPF_SK_SKB_STREAM_VERDICT, 0);
+       if (!err) {
+               printf("Failed invalid verdict prog attach\n");
                goto out_sockmap;
        }
 
@@ -591,14 +597,21 @@ static void test_sockmap(int task, void *data)
                goto out_sockmap;
        }
 
-       err = __bpf_prog_attach(parse_prog, verdict_prog, map_fd,
-                               BPF_CGROUP_SMAP_INGRESS, 0);
+       err = bpf_prog_attach(parse_prog, map_fd,
+                     BPF_SK_SKB_STREAM_PARSER, 0);
+       if (err) {
+               printf("Failed bpf prog attach\n");
+               goto out_sockmap;
+       }
+
+       err = bpf_prog_attach(verdict_prog, map_fd,
+                             BPF_SK_SKB_STREAM_VERDICT, 0);
        if (err) {
                printf("Failed bpf prog attach\n");
                goto out_sockmap;
        }
 
-       /* Test map update elem */
+       /* Test map update elem afterwards fd lives in fd and map_fd */
        for (i = 0; i < 6; i++) {
                err = bpf_map_update_elem(map_fd, &i, &sfd[i], BPF_ANY);
                if (err) {
@@ -649,96 +662,68 @@ static void test_sockmap(int task, void *data)
                goto out_sockmap;
        }
 
-       /* Delete the reset of the elems include some NULL elems */
-       for (i = 0; i < 6; i++) {
-               err = bpf_map_delete_elem(map_fd, &i);
-               if (err && (i == 0 || i == 1 || i >= 4)) {
-                       printf("Failed delete  sockmap %i '%i:%i'\n",
-                              err, i, sfd[i]);
-                       goto out_sockmap;
-               } else if (!err && (i == 2 || i == 3)) {
-                       printf("Failed null delete sockmap %i '%i:%i'\n",
-                              err, i, sfd[i]);
-                       goto out_sockmap;
-               }
-       }
-
-       /* Test having multiple SMAPs open and active on same fds */
-       err = __bpf_prog_attach(parse_prog, verdict_prog, fd,
-                               BPF_CGROUP_SMAP_INGRESS, 0);
-       if (err) {
-               printf("Failed fd bpf prog attach\n");
-               goto out_sockmap;
-       }
-
-       for (i = 0; i < 6; i++) {
-               err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_ANY);
-               if (err) {
-                       printf("Failed fd update sockmap %i '%i:%i'\n",
-                              err, i, sfd[i]);
-                       goto out_sockmap;
-               }
-       }
-
-       /* Test duplicate socket add of NOEXIST, ANY and EXIST */
-       i = 0;
+       /* Push fd into same slot */
+       i = 2;
        err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_NOEXIST);
        if (!err) {
-               printf("Failed BPF_NOEXIST create\n");
+               printf("Failed allowed sockmap dup slot BPF_NOEXIST\n");
                goto out_sockmap;
        }
 
        err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_ANY);
        if (err) {
-               printf("Failed sockmap update BPF_ANY\n");
+               printf("Failed sockmap update new slot BPF_ANY\n");
                goto out_sockmap;
        }
 
        err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_EXIST);
        if (err) {
-               printf("Failed sockmap update BPF_EXIST\n");
+               printf("Failed sockmap update new slot BPF_EXIST\n");
                goto out_sockmap;
        }
 
-       /* The above were pushing fd into same slot try different slot now */
-       i = 2;
-       err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_NOEXIST);
-       if (!err) {
-               printf("Failed BPF_NOEXIST create\n");
-               goto out_sockmap;
+       /* Delete the elems without programs */
+       for (i = 0; i < 6; i++) {
+               err = bpf_map_delete_elem(fd, &i);
+               if (err) {
+                       printf("Failed delete sockmap %i '%i:%i'\n",
+                              err, i, sfd[i]);
+               }
        }
 
-       err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_ANY);
+       /* Test having multiple maps open and set with programs on same fds */
+       err = bpf_prog_attach(parse_prog, fd,
+                             BPF_SK_SKB_STREAM_PARSER, 0);
        if (err) {
-               printf("Failed sockmap update BPF_ANY\n");
+               printf("Failed fd bpf parse prog attach\n");
                goto out_sockmap;
        }
-
-       err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_EXIST);
+       err = bpf_prog_attach(verdict_prog, fd,
+                             BPF_SK_SKB_STREAM_VERDICT, 0);
        if (err) {
-               printf("Failed sockmap update BPF_EXIST\n");
+               printf("Failed fd bpf verdict prog attach\n");
                goto out_sockmap;
        }
 
-       /* Try pushing fd into different map, this is not allowed at the
-        * moment. Which programs would we use?
-        */
-       err = bpf_map_update_elem(map_fd, &i, &sfd[i], BPF_NOEXIST);
-       if (!err) {
-               printf("Failed BPF_NOEXIST create\n");
-               goto out_sockmap;
-       }
-
-       err = bpf_map_update_elem(map_fd, &i, &sfd[i], BPF_ANY);
-       if (!err) {
-               printf("Failed sockmap update BPF_ANY\n");
-               goto out_sockmap;
-       }
-
-       err = bpf_map_update_elem(map_fd, &i, &sfd[i], BPF_EXIST);
-       if (!err) {
-               printf("Failed sockmap update BPF_EXIST\n");
-               goto out_sockmap;
+       for (i = 4; i < 6; i++) {
+               err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_ANY);
+               if (!err) {
+                       printf("Failed allowed duplicate programs in update ANY sockmap %i '%i:%i'\n",
+                              err, i, sfd[i]);
+                       goto out_sockmap;
+               }
+               err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_NOEXIST);
+               if (!err) {
+                       printf("Failed allowed duplicate program in update NOEXIST sockmap  %i '%i:%i'\n",
+                              err, i, sfd[i]);
+                       goto out_sockmap;
+               }
+               err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_EXIST);
+               if (!err) {
+                       printf("Failed allowed duplicate program in update EXIST sockmap  %i '%i:%i'\n",
+                              err, i, sfd[i]);
+                       goto out_sockmap;
+               }
        }
 
        /* Test map close sockets */