diff options
| -rw-r--r-- | include/uapi/linux/netfilter/nf_tables.h | 2 | ||||
| -rw-r--r-- | net/netfilter/Kconfig | 1 | ||||
| -rw-r--r-- | net/netfilter/nft_payload.c | 28 |
3 files changed, 31 insertions, 0 deletions
diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h index 352ee51707a1..98272cb5f617 100644 --- a/include/uapi/linux/netfilter/nf_tables.h +++ b/include/uapi/linux/netfilter/nf_tables.h @@ -749,10 +749,12 @@ enum nft_payload_bases { * * @NFT_PAYLOAD_CSUM_NONE: no checksumming * @NFT_PAYLOAD_CSUM_INET: internet checksum (RFC 791) + * @NFT_PAYLOAD_CSUM_SCTP: CRC-32c, for use in SCTP header (RFC 3309) */ enum nft_payload_csum_types { NFT_PAYLOAD_CSUM_NONE, NFT_PAYLOAD_CSUM_INET, + NFT_PAYLOAD_CSUM_SCTP, }; enum nft_payload_csum_flags { diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index 25313c29d799..52370211e46b 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -441,6 +441,7 @@ endif # NF_CONNTRACK config NF_TABLES select NETFILTER_NETLINK + select LIBCRC32C tristate "Netfilter nf_tables support" help nftables is the new packet classification framework that intends to diff --git a/net/netfilter/nft_payload.c b/net/netfilter/nft_payload.c index 7a2e59638499..dcd3c7b8a367 100644 --- a/net/netfilter/nft_payload.c +++ b/net/netfilter/nft_payload.c @@ -22,6 +22,7 @@ #include <linux/icmpv6.h> #include <linux/ip.h> #include <linux/ipv6.h> +#include <net/sctp/checksum.h> static bool nft_payload_rebuild_vlan_hdr(const struct sk_buff *skb, int mac_off, struct vlan_ethhdr *veth) @@ -484,6 +485,19 @@ static int nft_payload_l4csum_offset(const struct nft_pktinfo *pkt, return 0; } +static int nft_payload_csum_sctp(struct sk_buff *skb, int offset) +{ + struct sctphdr *sh; + + if (skb_ensure_writable(skb, offset + sizeof(*sh))) + return -1; + + sh = (struct sctphdr *)(skb->data + offset); + sh->checksum = sctp_compute_cksum(skb, offset); + skb->ip_summed = CHECKSUM_UNNECESSARY; + return 0; +} + static int nft_payload_l4csum_update(const struct nft_pktinfo *pkt, struct sk_buff *skb, __wsum fsum, __wsum tsum) @@ -587,6 +601,13 @@ static void nft_payload_set_eval(const struct nft_expr *expr, skb_store_bits(skb, offset, src, priv->len) < 0) goto err; + if (priv->csum_type == NFT_PAYLOAD_CSUM_SCTP && + pkt->tprot == IPPROTO_SCTP && + skb->ip_summed != CHECKSUM_PARTIAL) { + if (nft_payload_csum_sctp(skb, pkt->xt.thoff)) + goto err; + } + return; err: regs->verdict.code = NFT_BREAK; @@ -623,6 +644,13 @@ static int nft_payload_set_init(const struct nft_ctx *ctx, case NFT_PAYLOAD_CSUM_NONE: case NFT_PAYLOAD_CSUM_INET: break; + case NFT_PAYLOAD_CSUM_SCTP: + if (priv->base != NFT_PAYLOAD_TRANSPORT_HEADER) + return -EINVAL; + + if (priv->csum_offset != offsetof(struct sctphdr, checksum)) + return -EINVAL; + break; default: return -EOPNOTSUPP; } |