diff options
| -rw-r--r-- | include/uapi/linux/bpf.h | 10 | ||||
| -rw-r--r-- | net/core/filter.c | 28 |
2 files changed, 37 insertions, 1 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 2e308e90ffea..3c38ac9a92a7 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -2359,6 +2359,13 @@ union bpf_attr { * Return * A **struct bpf_tcp_sock** pointer on success, or NULL in * case of failure. + * + * int bpf_skb_ecn_set_ce(struct sk_buf *skb) + * Description + * Sets ECN of IP header to ce (congestion encountered) if + * current value is ect (ECN capable). Works with IPv6 and IPv4. + * Return + * 1 if set, 0 if not set. */ #define __BPF_FUNC_MAPPER(FN) \ FN(unspec), \ @@ -2457,7 +2464,8 @@ union bpf_attr { FN(spin_lock), \ FN(spin_unlock), \ FN(sk_fullsock), \ - FN(tcp_sock), + FN(tcp_sock), \ + FN(skb_ecn_set_ce), /* integer value in 'imm' field of BPF_CALL instruction selects which helper * function eBPF program intends to call diff --git a/net/core/filter.c b/net/core/filter.c index 85749f6ec789..558ca72f2254 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -5426,6 +5426,32 @@ static const struct bpf_func_proto bpf_tcp_sock_proto = { .arg1_type = ARG_PTR_TO_SOCK_COMMON, }; +BPF_CALL_1(bpf_skb_ecn_set_ce, struct sk_buff *, skb) +{ + unsigned int iphdr_len; + + if (skb->protocol == cpu_to_be16(ETH_P_IP)) + iphdr_len = sizeof(struct iphdr); + else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) + iphdr_len = sizeof(struct ipv6hdr); + else + return 0; + + if (skb_headlen(skb) < iphdr_len) + return 0; + + if (skb_cloned(skb) && !skb_clone_writable(skb, iphdr_len)) + return 0; + + return INET_ECN_set_ce(skb); +} + +static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto = { + .func = bpf_skb_ecn_set_ce, + .gpl_only = false, + .ret_type = RET_INTEGER, + .arg1_type = ARG_PTR_TO_CTX, +}; #endif /* CONFIG_INET */ bool bpf_helper_changes_pkt_data(void *func) @@ -5585,6 +5611,8 @@ cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) #ifdef CONFIG_INET case BPF_FUNC_tcp_sock: return &bpf_tcp_sock_proto; + case BPF_FUNC_skb_ecn_set_ce: + return &bpf_skb_ecn_set_ce_proto; #endif default: return sk_filter_func_proto(func_id, prog); |