diff options
author | Lorenz Bauer <lmb@cloudflare.com> | 2019-03-22 04:54:01 +0300 |
---|---|---|
committer | Alexei Starovoitov <ast@kernel.org> | 2019-03-22 04:59:10 +0300 |
commit | edbf8c01de5a104a71ed6df2bf6421ceb2836a8e (patch) | |
tree | 5e603fa0b5f6f5a02f846d68c34050e1aafb4642 /net | |
parent | 85a51f8c28b9812642d76db6889f3f39dc3fbab3 (diff) | |
download | linux-edbf8c01de5a104a71ed6df2bf6421ceb2836a8e.tar.xz |
bpf: add skc_lookup_tcp helper
Allow looking up a sock_common. This gives eBPF programs
access to timewait and request sockets.
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'net')
-rw-r--r-- | net/core/filter.c | 144 |
1 files changed, 122 insertions, 22 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index 647c63a7b25b..b6d83ba97621 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -5156,15 +5156,15 @@ static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple, return sk; } -/* bpf_sk_lookup performs the core lookup for different types of sockets, +/* bpf_skc_lookup performs the core lookup for different types of sockets, * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE. * Returns the socket as an 'unsigned long' to simplify the casting in the * callers to satisfy BPF_CALL declarations. */ -static unsigned long -__bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, - struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, - u64 flags) +static struct sock * +__bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, + struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, + u64 flags) { struct sock *sk = NULL; u8 family = AF_UNSPEC; @@ -5192,15 +5192,27 @@ __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, put_net(net); } +out: + return sk; +} + +static struct sock * +__bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, + struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, + u64 flags) +{ + struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net, + ifindex, proto, netns_id, flags); + if (sk) sk = sk_to_full_sk(sk); -out: - return (unsigned long) sk; + + return sk; } -static unsigned long -bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, - u8 proto, u64 netns_id, u64 flags) +static struct sock * +bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, + u8 proto, u64 netns_id, u64 flags) { struct net *caller_net; int ifindex; @@ -5213,14 +5225,47 @@ bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, ifindex = 0; } - return __bpf_sk_lookup(skb, tuple, len, caller_net, ifindex, - proto, netns_id, flags); + return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto, + netns_id, flags); } +static struct sock * +bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, + u8 proto, u64 netns_id, u64 flags) +{ + struct sock *sk = bpf_skc_lookup(skb, tuple, len, proto, netns_id, + flags); + + if (sk) + sk = sk_to_full_sk(sk); + + return sk; +} + +BPF_CALL_5(bpf_skc_lookup_tcp, struct sk_buff *, skb, + struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) +{ + return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP, + netns_id, flags); +} + +static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = { + .func = bpf_skc_lookup_tcp, + .gpl_only = false, + .pkt_access = true, + .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, + .arg1_type = ARG_PTR_TO_CTX, + .arg2_type = ARG_PTR_TO_MEM, + .arg3_type = ARG_CONST_SIZE, + .arg4_type = ARG_ANYTHING, + .arg5_type = ARG_ANYTHING, +}; + BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb, struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) { - return bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP, netns_id, flags); + return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP, + netns_id, flags); } static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = { @@ -5238,7 +5283,8 @@ static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = { BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb, struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) { - return bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP, netns_id, flags); + return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP, + netns_id, flags); } static const struct bpf_func_proto bpf_sk_lookup_udp_proto = { @@ -5273,8 +5319,9 @@ BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx, struct net *caller_net = dev_net(ctx->rxq->dev); int ifindex = ctx->rxq->dev->ifindex; - return __bpf_sk_lookup(NULL, tuple, len, caller_net, ifindex, - IPPROTO_UDP, netns_id, flags); + return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, + ifindex, IPPROTO_UDP, netns_id, + flags); } static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = { @@ -5289,14 +5336,38 @@ static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = { .arg5_type = ARG_ANYTHING, }; +BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx, + struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) +{ + struct net *caller_net = dev_net(ctx->rxq->dev); + int ifindex = ctx->rxq->dev->ifindex; + + return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net, + ifindex, IPPROTO_TCP, netns_id, + flags); +} + +static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = { + .func = bpf_xdp_skc_lookup_tcp, + .gpl_only = false, + .pkt_access = true, + .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, + .arg1_type = ARG_PTR_TO_CTX, + .arg2_type = ARG_PTR_TO_MEM, + .arg3_type = ARG_CONST_SIZE, + .arg4_type = ARG_ANYTHING, + .arg5_type = ARG_ANYTHING, +}; + BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx, struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) { struct net *caller_net = dev_net(ctx->rxq->dev); int ifindex = ctx->rxq->dev->ifindex; - return __bpf_sk_lookup(NULL, tuple, len, caller_net, ifindex, - IPPROTO_TCP, netns_id, flags); + return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, + ifindex, IPPROTO_TCP, netns_id, + flags); } static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = { @@ -5311,11 +5382,31 @@ static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = { .arg5_type = ARG_ANYTHING, }; +BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx, + struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) +{ + return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, + sock_net(ctx->sk), 0, + IPPROTO_TCP, netns_id, flags); +} + +static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = { + .func = bpf_sock_addr_skc_lookup_tcp, + .gpl_only = false, + .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, + .arg1_type = ARG_PTR_TO_CTX, + .arg2_type = ARG_PTR_TO_MEM, + .arg3_type = ARG_CONST_SIZE, + .arg4_type = ARG_ANYTHING, + .arg5_type = ARG_ANYTHING, +}; + BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx, struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) { - return __bpf_sk_lookup(NULL, tuple, len, sock_net(ctx->sk), 0, - IPPROTO_TCP, netns_id, flags); + return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, + sock_net(ctx->sk), 0, IPPROTO_TCP, + netns_id, flags); } static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = { @@ -5332,8 +5423,9 @@ static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = { BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx, struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) { - return __bpf_sk_lookup(NULL, tuple, len, sock_net(ctx->sk), 0, - IPPROTO_UDP, netns_id, flags); + return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, + sock_net(ctx->sk), 0, IPPROTO_UDP, + netns_id, flags); } static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = { @@ -5586,6 +5678,8 @@ sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_sock_addr_sk_lookup_udp_proto; case BPF_FUNC_sk_release: return &bpf_sk_release_proto; + case BPF_FUNC_skc_lookup_tcp: + return &bpf_sock_addr_skc_lookup_tcp_proto; #endif /* CONFIG_INET */ default: return bpf_base_func_proto(func_id); @@ -5719,6 +5813,8 @@ tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_tcp_sock_proto; case BPF_FUNC_get_listener_sock: return &bpf_get_listener_sock_proto; + case BPF_FUNC_skc_lookup_tcp: + return &bpf_skc_lookup_tcp_proto; #endif default: return bpf_base_func_proto(func_id); @@ -5754,6 +5850,8 @@ xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_xdp_sk_lookup_tcp_proto; case BPF_FUNC_sk_release: return &bpf_sk_release_proto; + case BPF_FUNC_skc_lookup_tcp: + return &bpf_xdp_skc_lookup_tcp_proto; #endif default: return bpf_base_func_proto(func_id); @@ -5846,6 +5944,8 @@ sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_sk_lookup_udp_proto; case BPF_FUNC_sk_release: return &bpf_sk_release_proto; + case BPF_FUNC_skc_lookup_tcp: + return &bpf_skc_lookup_tcp_proto; #endif default: return bpf_base_func_proto(func_id); |