diff options
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/filter.c | 19 | ||||
| -rw-r--r-- | net/core/sock_map.c | 38 |
2 files changed, 41 insertions, 16 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index 209482a4eaa2..73395384afe2 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -1755,25 +1755,27 @@ BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb, u32, offset, void *, to, u32, len, u32, start_header) { u8 *end = skb_tail_pointer(skb); - u8 *net = skb_network_header(skb); - u8 *mac = skb_mac_header(skb); - u8 *ptr; + u8 *start, *ptr; - if (unlikely(offset > 0xffff || len > (end - mac))) + if (unlikely(offset > 0xffff)) goto err_clear; switch (start_header) { case BPF_HDR_START_MAC: - ptr = mac + offset; + if (unlikely(!skb_mac_header_was_set(skb))) + goto err_clear; + start = skb_mac_header(skb); break; case BPF_HDR_START_NET: - ptr = net + offset; + start = skb_network_header(skb); break; default: goto err_clear; } - if (likely(ptr >= mac && ptr + len <= end)) { + ptr = start + offset; + + if (likely(ptr + len <= end)) { memcpy(to, ptr, len); return 0; } @@ -4340,8 +4342,6 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname, } break; case SO_BINDTODEVICE: - ret = -ENOPROTOOPT; -#ifdef CONFIG_NETDEVICES optlen = min_t(long, optlen, IFNAMSIZ - 1); strncpy(devname, optval, optlen); devname[optlen] = 0; @@ -4360,7 +4360,6 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname, dev_put(dev); } ret = sock_bindtoindex(sk, ifindex, false); -#endif break; default: ret = -EINVAL; diff --git a/net/core/sock_map.c b/net/core/sock_map.c index 00a26cf2cfe9..4059f94e9bb5 100644 --- a/net/core/sock_map.c +++ b/net/core/sock_map.c @@ -424,10 +424,7 @@ static int sock_map_get_next_key(struct bpf_map *map, void *key, void *next) return 0; } -static bool sock_map_redirect_allowed(const struct sock *sk) -{ - return sk->sk_state != TCP_LISTEN; -} +static bool sock_map_redirect_allowed(const struct sock *sk); static int sock_map_update_common(struct bpf_map *map, u32 idx, struct sock *sk, u64 flags) @@ -508,6 +505,11 @@ static bool sk_is_udp(const struct sock *sk) sk->sk_protocol == IPPROTO_UDP; } +static bool sock_map_redirect_allowed(const struct sock *sk) +{ + return sk_is_tcp(sk) && sk->sk_state != TCP_LISTEN; +} + static bool sock_map_sk_is_suitable(const struct sock *sk) { return sk_is_tcp(sk) || sk_is_udp(sk); @@ -989,11 +991,15 @@ static struct bpf_map *sock_hash_alloc(union bpf_attr *attr) err = -EINVAL; goto free_htab; } + err = bpf_map_charge_init(&htab->map.memory, cost); + if (err) + goto free_htab; htab->buckets = bpf_map_area_alloc(htab->buckets_num * sizeof(struct bpf_htab_bucket), htab->map.numa_node); if (!htab->buckets) { + bpf_map_charge_finish(&htab->map.memory); err = -ENOMEM; goto free_htab; } @@ -1013,6 +1019,7 @@ static void sock_hash_free(struct bpf_map *map) { struct bpf_htab *htab = container_of(map, struct bpf_htab, map); struct bpf_htab_bucket *bucket; + struct hlist_head unlink_list; struct bpf_htab_elem *elem; struct hlist_node *node; int i; @@ -1024,13 +1031,32 @@ static void sock_hash_free(struct bpf_map *map) synchronize_rcu(); for (i = 0; i < htab->buckets_num; i++) { bucket = sock_hash_select_bucket(htab, i); - hlist_for_each_entry_safe(elem, node, &bucket->head, node) { - hlist_del_rcu(&elem->node); + + /* We are racing with sock_hash_delete_from_link to + * enter the spin-lock critical section. Every socket on + * the list is still linked to sockhash. Since link + * exists, psock exists and holds a ref to socket. That + * lets us to grab a socket ref too. + */ + raw_spin_lock_bh(&bucket->lock); + hlist_for_each_entry(elem, &bucket->head, node) + sock_hold(elem->sk); + hlist_move_list(&bucket->head, &unlink_list); + raw_spin_unlock_bh(&bucket->lock); + + /* Process removed entries out of atomic context to + * block for socket lock before deleting the psock's + * link to sockhash. + */ + hlist_for_each_entry_safe(elem, node, &unlink_list, node) { + hlist_del(&elem->node); lock_sock(elem->sk); rcu_read_lock(); sock_map_unref(elem->sk, elem); rcu_read_unlock(); release_sock(elem->sk); + sock_put(elem->sk); + sock_hash_free_elem(htab, elem); } } |