diff options
Diffstat (limited to 'net/netfilter/nft_rt.c')
| -rw-r--r-- | net/netfilter/nft_rt.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/net/netfilter/nft_rt.c b/net/netfilter/nft_rt.c index c7383d8f88d0..e142e65d3176 100644 --- a/net/netfilter/nft_rt.c +++ b/net/netfilter/nft_rt.c @@ -23,6 +23,42 @@ struct nft_rt { enum nft_registers dreg:8; }; +static u16 get_tcpmss(const struct nft_pktinfo *pkt, const struct dst_entry *skbdst) +{ + u32 minlen = sizeof(struct ipv6hdr), mtu = dst_mtu(skbdst); + const struct sk_buff *skb = pkt->skb; + const struct nf_afinfo *ai; + struct flowi fl; + + memset(&fl, 0, sizeof(fl)); + + switch (nft_pf(pkt)) { + case NFPROTO_IPV4: + fl.u.ip4.daddr = ip_hdr(skb)->saddr; + minlen = sizeof(struct iphdr); + break; + case NFPROTO_IPV6: + fl.u.ip6.daddr = ipv6_hdr(skb)->saddr; + break; + } + + ai = nf_get_afinfo(nft_pf(pkt)); + if (ai) { + struct dst_entry *dst = NULL; + + ai->route(nft_net(pkt), &dst, &fl, false); + if (dst) { + mtu = min(mtu, dst_mtu(dst)); + dst_release(dst); + } + } + + if (mtu <= minlen || mtu > 0xffff) + return TCP_MSS_DEFAULT; + + return mtu - minlen; +} + static void nft_rt_get_eval(const struct nft_expr *expr, struct nft_regs *regs, const struct nft_pktinfo *pkt) @@ -57,6 +93,9 @@ static void nft_rt_get_eval(const struct nft_expr *expr, &ipv6_hdr(skb)->daddr), sizeof(struct in6_addr)); break; + case NFT_RT_TCPMSS: + nft_reg_store16(dest, get_tcpmss(pkt, dst)); + break; default: WARN_ON(1); goto err; @@ -94,6 +133,9 @@ static int nft_rt_get_init(const struct nft_ctx *ctx, case NFT_RT_NEXTHOP6: len = sizeof(struct in6_addr); break; + case NFT_RT_TCPMSS: + len = sizeof(u16); + break; default: return -EOPNOTSUPP; } @@ -118,6 +160,29 @@ nla_put_failure: return -1; } +static int nft_rt_validate(const struct nft_ctx *ctx, const struct nft_expr *expr, + const struct nft_data **data) +{ + const struct nft_rt *priv = nft_expr_priv(expr); + unsigned int hooks; + + switch (priv->key) { + case NFT_RT_NEXTHOP4: + case NFT_RT_NEXTHOP6: + case NFT_RT_CLASSID: + return 0; + case NFT_RT_TCPMSS: + hooks = (1 << NF_INET_FORWARD) | + (1 << NF_INET_LOCAL_OUT) | + (1 << NF_INET_POST_ROUTING); + break; + default: + return -EINVAL; + } + + return nft_chain_validate_hooks(ctx->chain, hooks); +} + static struct nft_expr_type nft_rt_type; static const struct nft_expr_ops nft_rt_get_ops = { .type = &nft_rt_type, @@ -125,6 +190,7 @@ static const struct nft_expr_ops nft_rt_get_ops = { .eval = nft_rt_get_eval, .init = nft_rt_get_init, .dump = nft_rt_get_dump, + .validate = nft_rt_validate, }; static struct nft_expr_type nft_rt_type __read_mostly = { |