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Commit 6bdc9c4c authored by John Fastabend's avatar John Fastabend Committed by David S. Miller
Browse files

bpf: sock_map fixes for !CONFIG_BPF_SYSCALL and !STREAM_PARSER 



Resolve issues with !CONFIG_BPF_SYSCALL and !STREAM_PARSER

net/core/filter.c: In function ‘do_sk_redirect_map’:
net/core/filter.c:1881:3: error: implicit declaration of function ‘__sock_map_lookup_elem’ [-Werror=implicit-function-declaration]
   sk = __sock_map_lookup_elem(ri->map, ri->ifindex);
   ^
net/core/filter.c:1881:6: warning: assignment makes pointer from integer without a cast [enabled by default]
   sk = __sock_map_lookup_elem(ri->map, ri->ifindex);

Fixes: 174a79ff ("bpf: sockmap with sk redirect support")
Reported-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarJohn Fastabend <john.fastabend@gmail.com>
Acked-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cf56e3b9

include/linux/bpf.h

+9 −1
Original line number Diff line number Diff line
@@ -313,7 +313,6 @@ int bpf_check(struct bpf_prog **fp, union bpf_attr *attr); 


/* Map specifics */

struct net_device  *__dev_map_lookup_elem(struct bpf_map *map, u32 key);

struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key);

void __dev_map_insert_ctx(struct bpf_map *map, u32 index);

void __dev_map_flush(struct bpf_map *map);
@@ -377,6 +376,15 @@ static inline void __dev_map_flush(struct bpf_map *map) 
}

#endif /* CONFIG_BPF_SYSCALL */



#if defined(CONFIG_STREAM_PARSER) && defined(CONFIG_BPF_SYSCALL)

struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key);

#else

static inline struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key)

{

	return NULL;

}

#endif



/* verifier prototypes for helper functions called from eBPF programs */

extern const struct bpf_func_proto bpf_map_lookup_elem_proto;

extern const struct bpf_func_proto bpf_map_update_elem_proto;

include/linux/bpf_types.h

+2 −0
Original line number Diff line number Diff line
@@ -38,5 +38,7 @@ BPF_MAP_TYPE(BPF_MAP_TYPE_ARRAY_OF_MAPS, array_of_maps_map_ops) 
BPF_MAP_TYPE(BPF_MAP_TYPE_HASH_OF_MAPS, htab_of_maps_map_ops)

#ifdef CONFIG_NET

BPF_MAP_TYPE(BPF_MAP_TYPE_DEVMAP, dev_map_ops)

#ifdef CONFIG_STREAM_PARSER

BPF_MAP_TYPE(BPF_MAP_TYPE_SOCKMAP, sock_map_ops)

#endif

#endif

kernel/bpf/Makefile

+4 −1
Original line number Diff line number Diff line
@@ -3,7 +3,10 @@ obj-y := core.o 
obj-$(CONFIG_BPF_SYSCALL) += syscall.o verifier.o inode.o helpers.o tnum.o

obj-$(CONFIG_BPF_SYSCALL) += hashtab.o arraymap.o percpu_freelist.o bpf_lru_list.o lpm_trie.o map_in_map.o

ifeq ($(CONFIG_NET),y)

obj-$(CONFIG_BPF_SYSCALL) += devmap.o sockmap.o

obj-$(CONFIG_BPF_SYSCALL) += devmap.o

ifeq ($(CONFIG_STREAM_PARSER),y)

obj-$(CONFIG_BPF_SYSCALL) += sockmap.o

endif

endif

ifeq ($(CONFIG_PERF_EVENTS),y)

obj-$(CONFIG_BPF_SYSCALL) += stackmap.o

kernel/bpf/core.c

+1 −0
Original line number Diff line number Diff line
@@ -1438,6 +1438,7 @@ const struct bpf_func_proto bpf_ktime_get_ns_proto __weak; 
const struct bpf_func_proto bpf_get_current_pid_tgid_proto __weak;

const struct bpf_func_proto bpf_get_current_uid_gid_proto __weak;

const struct bpf_func_proto bpf_get_current_comm_proto __weak;

const struct bpf_func_proto bpf_sock_map_update_proto __weak;



const struct bpf_func_proto * __weak bpf_get_trace_printk_proto(void)

{