diff options
Diffstat (limited to 'include/net/netfilter/nf_reject.h')
-rw-r--r-- | include/net/netfilter/nf_reject.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_reject.h b/include/net/netfilter/nf_reject.h new file mode 100644 index 000000000..7c669792f --- /dev/null +++ b/include/net/netfilter/nf_reject.h @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _NF_REJECT_H +#define _NF_REJECT_H + +#include <linux/types.h> +#include <uapi/linux/in.h> + +static inline bool nf_reject_verify_csum(struct sk_buff *skb, int dataoff, + __u8 proto) +{ + /* Skip protocols that don't use 16-bit one's complement checksum + * of the entire payload. + */ + switch (proto) { + /* Protocols with optional checksums. */ + case IPPROTO_UDP: { + const struct udphdr *udp_hdr; + struct udphdr _udp_hdr; + + udp_hdr = skb_header_pointer(skb, dataoff, + sizeof(_udp_hdr), + &_udp_hdr); + if (!udp_hdr || udp_hdr->check) + return true; + + return false; + } + case IPPROTO_GRE: + + /* Protocols with other integrity checks. */ + case IPPROTO_AH: + case IPPROTO_ESP: + case IPPROTO_SCTP: + + /* Protocols with partial checksums. */ + case IPPROTO_UDPLITE: + case IPPROTO_DCCP: + return false; + } + return true; +} + +#endif /* _NF_REJECT_H */ |