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Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf
Pablo Neira Ayuso says: ==================== netfilter/ipvs fixes for net The following patchset contains fixes for netfilter/ipvs. This round of fixes is larger than usual at this stage, specifically because of the nf_tables bridge reject fixes that I would like to see in 3.18. The patches are: 1) Fix a null-pointer dereference that may occur when logging errors. This problem was introduced by4a4739d56b("ipvs: Pull out crosses_local_route_boundary logic") in v3.17-rc5. 2) Update hook mask in nft_reject_bridge so we can also filter out packets from there. This fixes36d2af5("netfilter: nf_tables: allow to filter from prerouting and postrouting"), which needs this chunk to work. 3) Two patches to refactor common code to forge the IPv4 and IPv6 reject packets from the bridge. These are required by the nf_tables reject bridge fix. 4) Fix nft_reject_bridge by avoiding the use of the IP stack to reject packets from the bridge. The idea is to forge the reject packets and inject them to the original port via br_deliver() which is now exported for that purpose. 5) Restrict nft_reject_bridge to bridge prerouting and input hooks. the original skbuff may cloned after prerouting when the bridge stack needs to flood it to several bridge ports, it is too late to reject the traffic. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
commit
e3a88f9c4f
@ -1,6 +1,8 @@
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#ifndef _IPV4_NF_REJECT_H
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#define _IPV4_NF_REJECT_H
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#include <linux/skbuff.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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static inline void nf_send_unreach(struct sk_buff *skb_in, int code)
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@ -10,4 +12,12 @@ static inline void nf_send_unreach(struct sk_buff *skb_in, int code)
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void nf_send_reset(struct sk_buff *oldskb, int hook);
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const struct tcphdr *nf_reject_ip_tcphdr_get(struct sk_buff *oldskb,
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struct tcphdr *_oth, int hook);
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struct iphdr *nf_reject_iphdr_put(struct sk_buff *nskb,
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const struct sk_buff *oldskb,
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__be16 protocol, int ttl);
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void nf_reject_ip_tcphdr_put(struct sk_buff *nskb, const struct sk_buff *oldskb,
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const struct tcphdr *oth);
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#endif /* _IPV4_NF_REJECT_H */
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@ -15,4 +15,14 @@ nf_send_unreach6(struct net *net, struct sk_buff *skb_in, unsigned char code,
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void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook);
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const struct tcphdr *nf_reject_ip6_tcphdr_get(struct sk_buff *oldskb,
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struct tcphdr *otcph,
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unsigned int *otcplen, int hook);
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struct ipv6hdr *nf_reject_ip6hdr_put(struct sk_buff *nskb,
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const struct sk_buff *oldskb,
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__be16 protocol, int hoplimit);
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void nf_reject_ip6_tcphdr_put(struct sk_buff *nskb,
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const struct sk_buff *oldskb,
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const struct tcphdr *oth, unsigned int otcplen);
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#endif /* _IPV6_NF_REJECT_H */
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@ -112,6 +112,7 @@ void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
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kfree_skb(skb);
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}
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EXPORT_SYMBOL_GPL(br_deliver);
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/* called with rcu_read_lock */
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void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, struct sk_buff *skb0)
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@ -75,9 +75,11 @@ static const struct nf_chain_type filter_bridge = {
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.type = NFT_CHAIN_T_DEFAULT,
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.family = NFPROTO_BRIDGE,
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.owner = THIS_MODULE,
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.hook_mask = (1 << NF_BR_LOCAL_IN) |
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.hook_mask = (1 << NF_BR_PRE_ROUTING) |
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(1 << NF_BR_LOCAL_IN) |
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(1 << NF_BR_FORWARD) |
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(1 << NF_BR_LOCAL_OUT),
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(1 << NF_BR_LOCAL_OUT) |
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(1 << NF_BR_POST_ROUTING),
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};
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static int __init nf_tables_bridge_init(void)
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@ -16,6 +16,238 @@
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#include <net/netfilter/nft_reject.h>
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#include <net/netfilter/ipv4/nf_reject.h>
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#include <net/netfilter/ipv6/nf_reject.h>
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#include <linux/ip.h>
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#include <net/ip.h>
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#include <linux/netfilter_bridge.h>
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#include "../br_private.h"
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static void nft_reject_br_push_etherhdr(struct sk_buff *oldskb,
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struct sk_buff *nskb)
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{
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struct ethhdr *eth;
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eth = (struct ethhdr *)skb_push(nskb, ETH_HLEN);
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skb_reset_mac_header(nskb);
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ether_addr_copy(eth->h_source, eth_hdr(oldskb)->h_dest);
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ether_addr_copy(eth->h_dest, eth_hdr(oldskb)->h_source);
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eth->h_proto = eth_hdr(oldskb)->h_proto;
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skb_pull(nskb, ETH_HLEN);
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}
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static int nft_reject_iphdr_validate(struct sk_buff *oldskb)
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{
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struct iphdr *iph;
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u32 len;
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if (!pskb_may_pull(oldskb, sizeof(struct iphdr)))
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return 0;
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iph = ip_hdr(oldskb);
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if (iph->ihl < 5 || iph->version != 4)
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return 0;
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len = ntohs(iph->tot_len);
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if (oldskb->len < len)
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return 0;
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else if (len < (iph->ihl*4))
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return 0;
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if (!pskb_may_pull(oldskb, iph->ihl*4))
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return 0;
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return 1;
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}
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static void nft_reject_br_send_v4_tcp_reset(struct sk_buff *oldskb, int hook)
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{
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struct sk_buff *nskb;
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struct iphdr *niph;
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const struct tcphdr *oth;
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struct tcphdr _oth;
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if (!nft_reject_iphdr_validate(oldskb))
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return;
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oth = nf_reject_ip_tcphdr_get(oldskb, &_oth, hook);
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if (!oth)
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return;
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nskb = alloc_skb(sizeof(struct iphdr) + sizeof(struct tcphdr) +
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LL_MAX_HEADER, GFP_ATOMIC);
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if (!nskb)
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return;
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skb_reserve(nskb, LL_MAX_HEADER);
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niph = nf_reject_iphdr_put(nskb, oldskb, IPPROTO_TCP,
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sysctl_ip_default_ttl);
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nf_reject_ip_tcphdr_put(nskb, oldskb, oth);
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niph->ttl = sysctl_ip_default_ttl;
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niph->tot_len = htons(nskb->len);
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ip_send_check(niph);
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nft_reject_br_push_etherhdr(oldskb, nskb);
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br_deliver(br_port_get_rcu(oldskb->dev), nskb);
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}
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static void nft_reject_br_send_v4_unreach(struct sk_buff *oldskb, int hook,
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u8 code)
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{
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struct sk_buff *nskb;
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struct iphdr *niph;
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struct icmphdr *icmph;
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unsigned int len;
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void *payload;
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__wsum csum;
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if (!nft_reject_iphdr_validate(oldskb))
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return;
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/* IP header checks: fragment. */
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if (ip_hdr(oldskb)->frag_off & htons(IP_OFFSET))
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return;
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/* RFC says return as much as we can without exceeding 576 bytes. */
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len = min_t(unsigned int, 536, oldskb->len);
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if (!pskb_may_pull(oldskb, len))
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return;
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if (nf_ip_checksum(oldskb, hook, ip_hdrlen(oldskb), 0))
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return;
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nskb = alloc_skb(sizeof(struct iphdr) + sizeof(struct icmphdr) +
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LL_MAX_HEADER + len, GFP_ATOMIC);
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if (!nskb)
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return;
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skb_reserve(nskb, LL_MAX_HEADER);
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niph = nf_reject_iphdr_put(nskb, oldskb, IPPROTO_ICMP,
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sysctl_ip_default_ttl);
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skb_reset_transport_header(nskb);
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icmph = (struct icmphdr *)skb_put(nskb, sizeof(struct icmphdr));
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memset(icmph, 0, sizeof(*icmph));
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icmph->type = ICMP_DEST_UNREACH;
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icmph->code = code;
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payload = skb_put(nskb, len);
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memcpy(payload, skb_network_header(oldskb), len);
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csum = csum_partial((void *)icmph, len + sizeof(struct icmphdr), 0);
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icmph->checksum = csum_fold(csum);
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niph->tot_len = htons(nskb->len);
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ip_send_check(niph);
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nft_reject_br_push_etherhdr(oldskb, nskb);
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br_deliver(br_port_get_rcu(oldskb->dev), nskb);
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}
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static int nft_reject_ip6hdr_validate(struct sk_buff *oldskb)
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{
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struct ipv6hdr *hdr;
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u32 pkt_len;
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if (!pskb_may_pull(oldskb, sizeof(struct ipv6hdr)))
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return 0;
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hdr = ipv6_hdr(oldskb);
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if (hdr->version != 6)
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return 0;
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pkt_len = ntohs(hdr->payload_len);
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if (pkt_len + sizeof(struct ipv6hdr) > oldskb->len)
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return 0;
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return 1;
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}
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static void nft_reject_br_send_v6_tcp_reset(struct net *net,
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struct sk_buff *oldskb, int hook)
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{
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struct sk_buff *nskb;
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const struct tcphdr *oth;
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struct tcphdr _oth;
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unsigned int otcplen;
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struct ipv6hdr *nip6h;
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if (!nft_reject_ip6hdr_validate(oldskb))
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return;
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oth = nf_reject_ip6_tcphdr_get(oldskb, &_oth, &otcplen, hook);
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if (!oth)
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return;
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nskb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(struct tcphdr) +
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LL_MAX_HEADER, GFP_ATOMIC);
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if (!nskb)
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return;
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skb_reserve(nskb, LL_MAX_HEADER);
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nip6h = nf_reject_ip6hdr_put(nskb, oldskb, IPPROTO_TCP,
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net->ipv6.devconf_all->hop_limit);
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nf_reject_ip6_tcphdr_put(nskb, oldskb, oth, otcplen);
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nip6h->payload_len = htons(nskb->len - sizeof(struct ipv6hdr));
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nft_reject_br_push_etherhdr(oldskb, nskb);
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br_deliver(br_port_get_rcu(oldskb->dev), nskb);
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}
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static void nft_reject_br_send_v6_unreach(struct net *net,
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struct sk_buff *oldskb, int hook,
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u8 code)
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{
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struct sk_buff *nskb;
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struct ipv6hdr *nip6h;
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struct icmp6hdr *icmp6h;
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unsigned int len;
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void *payload;
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if (!nft_reject_ip6hdr_validate(oldskb))
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return;
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/* Include "As much of invoking packet as possible without the ICMPv6
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* packet exceeding the minimum IPv6 MTU" in the ICMP payload.
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*/
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len = min_t(unsigned int, 1220, oldskb->len);
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if (!pskb_may_pull(oldskb, len))
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return;
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nskb = alloc_skb(sizeof(struct iphdr) + sizeof(struct icmp6hdr) +
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LL_MAX_HEADER + len, GFP_ATOMIC);
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if (!nskb)
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return;
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skb_reserve(nskb, LL_MAX_HEADER);
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nip6h = nf_reject_ip6hdr_put(nskb, oldskb, IPPROTO_ICMPV6,
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net->ipv6.devconf_all->hop_limit);
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skb_reset_transport_header(nskb);
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icmp6h = (struct icmp6hdr *)skb_put(nskb, sizeof(struct icmp6hdr));
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memset(icmp6h, 0, sizeof(*icmp6h));
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icmp6h->icmp6_type = ICMPV6_DEST_UNREACH;
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icmp6h->icmp6_code = code;
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payload = skb_put(nskb, len);
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memcpy(payload, skb_network_header(oldskb), len);
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nip6h->payload_len = htons(nskb->len - sizeof(struct ipv6hdr));
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icmp6h->icmp6_cksum =
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csum_ipv6_magic(&nip6h->saddr, &nip6h->daddr,
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nskb->len - sizeof(struct ipv6hdr),
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IPPROTO_ICMPV6,
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csum_partial(icmp6h,
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nskb->len - sizeof(struct ipv6hdr),
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0));
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nft_reject_br_push_etherhdr(oldskb, nskb);
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br_deliver(br_port_get_rcu(oldskb->dev), nskb);
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}
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static void nft_reject_bridge_eval(const struct nft_expr *expr,
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struct nft_data data[NFT_REG_MAX + 1],
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@ -23,35 +255,46 @@ static void nft_reject_bridge_eval(const struct nft_expr *expr,
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{
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struct nft_reject *priv = nft_expr_priv(expr);
|
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struct net *net = dev_net((pkt->in != NULL) ? pkt->in : pkt->out);
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const unsigned char *dest = eth_hdr(pkt->skb)->h_dest;
|
||||
|
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if (is_broadcast_ether_addr(dest) ||
|
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is_multicast_ether_addr(dest))
|
||||
goto out;
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||||
|
||||
switch (eth_hdr(pkt->skb)->h_proto) {
|
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case htons(ETH_P_IP):
|
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switch (priv->type) {
|
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case NFT_REJECT_ICMP_UNREACH:
|
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nf_send_unreach(pkt->skb, priv->icmp_code);
|
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nft_reject_br_send_v4_unreach(pkt->skb,
|
||||
pkt->ops->hooknum,
|
||||
priv->icmp_code);
|
||||
break;
|
||||
case NFT_REJECT_TCP_RST:
|
||||
nf_send_reset(pkt->skb, pkt->ops->hooknum);
|
||||
nft_reject_br_send_v4_tcp_reset(pkt->skb,
|
||||
pkt->ops->hooknum);
|
||||
break;
|
||||
case NFT_REJECT_ICMPX_UNREACH:
|
||||
nf_send_unreach(pkt->skb,
|
||||
nft_reject_icmp_code(priv->icmp_code));
|
||||
nft_reject_br_send_v4_unreach(pkt->skb,
|
||||
pkt->ops->hooknum,
|
||||
nft_reject_icmp_code(priv->icmp_code));
|
||||
break;
|
||||
}
|
||||
break;
|
||||
case htons(ETH_P_IPV6):
|
||||
switch (priv->type) {
|
||||
case NFT_REJECT_ICMP_UNREACH:
|
||||
nf_send_unreach6(net, pkt->skb, priv->icmp_code,
|
||||
pkt->ops->hooknum);
|
||||
nft_reject_br_send_v6_unreach(net, pkt->skb,
|
||||
pkt->ops->hooknum,
|
||||
priv->icmp_code);
|
||||
break;
|
||||
case NFT_REJECT_TCP_RST:
|
||||
nf_send_reset6(net, pkt->skb, pkt->ops->hooknum);
|
||||
nft_reject_br_send_v6_tcp_reset(net, pkt->skb,
|
||||
pkt->ops->hooknum);
|
||||
break;
|
||||
case NFT_REJECT_ICMPX_UNREACH:
|
||||
nf_send_unreach6(net, pkt->skb,
|
||||
nft_reject_icmpv6_code(priv->icmp_code),
|
||||
pkt->ops->hooknum);
|
||||
nft_reject_br_send_v6_unreach(net, pkt->skb,
|
||||
pkt->ops->hooknum,
|
||||
nft_reject_icmpv6_code(priv->icmp_code));
|
||||
break;
|
||||
}
|
||||
break;
|
||||
@ -59,15 +302,38 @@ static void nft_reject_bridge_eval(const struct nft_expr *expr,
|
||||
/* No explicit way to reject this protocol, drop it. */
|
||||
break;
|
||||
}
|
||||
out:
|
||||
data[NFT_REG_VERDICT].verdict = NF_DROP;
|
||||
}
|
||||
|
||||
static int nft_reject_bridge_validate_hooks(const struct nft_chain *chain)
|
||||
{
|
||||
struct nft_base_chain *basechain;
|
||||
|
||||
if (chain->flags & NFT_BASE_CHAIN) {
|
||||
basechain = nft_base_chain(chain);
|
||||
|
||||
switch (basechain->ops[0].hooknum) {
|
||||
case NF_BR_PRE_ROUTING:
|
||||
case NF_BR_LOCAL_IN:
|
||||
break;
|
||||
default:
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nft_reject_bridge_init(const struct nft_ctx *ctx,
|
||||
const struct nft_expr *expr,
|
||||
const struct nlattr * const tb[])
|
||||
{
|
||||
struct nft_reject *priv = nft_expr_priv(expr);
|
||||
int icmp_code;
|
||||
int icmp_code, err;
|
||||
|
||||
err = nft_reject_bridge_validate_hooks(ctx->chain);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
if (tb[NFTA_REJECT_TYPE] == NULL)
|
||||
return -EINVAL;
|
||||
@ -116,6 +382,13 @@ nla_put_failure:
|
||||
return -1;
|
||||
}
|
||||
|
||||
static int nft_reject_bridge_validate(const struct nft_ctx *ctx,
|
||||
const struct nft_expr *expr,
|
||||
const struct nft_data **data)
|
||||
{
|
||||
return nft_reject_bridge_validate_hooks(ctx->chain);
|
||||
}
|
||||
|
||||
static struct nft_expr_type nft_reject_bridge_type;
|
||||
static const struct nft_expr_ops nft_reject_bridge_ops = {
|
||||
.type = &nft_reject_bridge_type,
|
||||
@ -123,6 +396,7 @@ static const struct nft_expr_ops nft_reject_bridge_ops = {
|
||||
.eval = nft_reject_bridge_eval,
|
||||
.init = nft_reject_bridge_init,
|
||||
.dump = nft_reject_bridge_dump,
|
||||
.validate = nft_reject_bridge_validate,
|
||||
};
|
||||
|
||||
static struct nft_expr_type nft_reject_bridge_type __read_mostly = {
|
||||
|
||||
@ -12,43 +12,39 @@
|
||||
#include <net/route.h>
|
||||
#include <net/dst.h>
|
||||
#include <linux/netfilter_ipv4.h>
|
||||
#include <net/netfilter/ipv4/nf_reject.h>
|
||||
|
||||
/* Send RST reply */
|
||||
void nf_send_reset(struct sk_buff *oldskb, int hook)
|
||||
const struct tcphdr *nf_reject_ip_tcphdr_get(struct sk_buff *oldskb,
|
||||
struct tcphdr *_oth, int hook)
|
||||
{
|
||||
struct sk_buff *nskb;
|
||||
const struct iphdr *oiph;
|
||||
struct iphdr *niph;
|
||||
const struct tcphdr *oth;
|
||||
struct tcphdr _otcph, *tcph;
|
||||
|
||||
/* IP header checks: fragment. */
|
||||
if (ip_hdr(oldskb)->frag_off & htons(IP_OFFSET))
|
||||
return;
|
||||
return NULL;
|
||||
|
||||
oth = skb_header_pointer(oldskb, ip_hdrlen(oldskb),
|
||||
sizeof(_otcph), &_otcph);
|
||||
sizeof(struct tcphdr), _oth);
|
||||
if (oth == NULL)
|
||||
return;
|
||||
return NULL;
|
||||
|
||||
/* No RST for RST. */
|
||||
if (oth->rst)
|
||||
return;
|
||||
|
||||
if (skb_rtable(oldskb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))
|
||||
return;
|
||||
return NULL;
|
||||
|
||||
/* Check checksum */
|
||||
if (nf_ip_checksum(oldskb, hook, ip_hdrlen(oldskb), IPPROTO_TCP))
|
||||
return;
|
||||
oiph = ip_hdr(oldskb);
|
||||
return NULL;
|
||||
|
||||
nskb = alloc_skb(sizeof(struct iphdr) + sizeof(struct tcphdr) +
|
||||
LL_MAX_HEADER, GFP_ATOMIC);
|
||||
if (!nskb)
|
||||
return;
|
||||
return oth;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(nf_reject_ip_tcphdr_get);
|
||||
|
||||
skb_reserve(nskb, LL_MAX_HEADER);
|
||||
struct iphdr *nf_reject_iphdr_put(struct sk_buff *nskb,
|
||||
const struct sk_buff *oldskb,
|
||||
__be16 protocol, int ttl)
|
||||
{
|
||||
struct iphdr *niph, *oiph = ip_hdr(oldskb);
|
||||
|
||||
skb_reset_network_header(nskb);
|
||||
niph = (struct iphdr *)skb_put(nskb, sizeof(struct iphdr));
|
||||
@ -57,10 +53,23 @@ void nf_send_reset(struct sk_buff *oldskb, int hook)
|
||||
niph->tos = 0;
|
||||
niph->id = 0;
|
||||
niph->frag_off = htons(IP_DF);
|
||||
niph->protocol = IPPROTO_TCP;
|
||||
niph->protocol = protocol;
|
||||
niph->check = 0;
|
||||
niph->saddr = oiph->daddr;
|
||||
niph->daddr = oiph->saddr;
|
||||
niph->ttl = ttl;
|
||||
|
||||
nskb->protocol = htons(ETH_P_IP);
|
||||
|
||||
return niph;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(nf_reject_iphdr_put);
|
||||
|
||||
void nf_reject_ip_tcphdr_put(struct sk_buff *nskb, const struct sk_buff *oldskb,
|
||||
const struct tcphdr *oth)
|
||||
{
|
||||
struct iphdr *niph = ip_hdr(nskb);
|
||||
struct tcphdr *tcph;
|
||||
|
||||
skb_reset_transport_header(nskb);
|
||||
tcph = (struct tcphdr *)skb_put(nskb, sizeof(struct tcphdr));
|
||||
@ -69,9 +78,9 @@ void nf_send_reset(struct sk_buff *oldskb, int hook)
|
||||
tcph->dest = oth->source;
|
||||
tcph->doff = sizeof(struct tcphdr) / 4;
|
||||
|
||||
if (oth->ack)
|
||||
if (oth->ack) {
|
||||
tcph->seq = oth->ack_seq;
|
||||
else {
|
||||
} else {
|
||||
tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin +
|
||||
oldskb->len - ip_hdrlen(oldskb) -
|
||||
(oth->doff << 2));
|
||||
@ -84,16 +93,43 @@ void nf_send_reset(struct sk_buff *oldskb, int hook)
|
||||
nskb->ip_summed = CHECKSUM_PARTIAL;
|
||||
nskb->csum_start = (unsigned char *)tcph - nskb->head;
|
||||
nskb->csum_offset = offsetof(struct tcphdr, check);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(nf_reject_ip_tcphdr_put);
|
||||
|
||||
/* Send RST reply */
|
||||
void nf_send_reset(struct sk_buff *oldskb, int hook)
|
||||
{
|
||||
struct sk_buff *nskb;
|
||||
const struct iphdr *oiph;
|
||||
struct iphdr *niph;
|
||||
const struct tcphdr *oth;
|
||||
struct tcphdr _oth;
|
||||
|
||||
oth = nf_reject_ip_tcphdr_get(oldskb, &_oth, hook);
|
||||
if (!oth)
|
||||
return;
|
||||
|
||||
if (skb_rtable(oldskb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))
|
||||
return;
|
||||
|
||||
oiph = ip_hdr(oldskb);
|
||||
|
||||
nskb = alloc_skb(sizeof(struct iphdr) + sizeof(struct tcphdr) +
|
||||
LL_MAX_HEADER, GFP_ATOMIC);
|
||||
if (!nskb)
|
||||
return;
|
||||
|
||||
/* ip_route_me_harder expects skb->dst to be set */
|
||||
skb_dst_set_noref(nskb, skb_dst(oldskb));
|
||||
|
||||
nskb->protocol = htons(ETH_P_IP);
|
||||
skb_reserve(nskb, LL_MAX_HEADER);
|
||||
niph = nf_reject_iphdr_put(nskb, oldskb, IPPROTO_TCP,
|
||||
ip4_dst_hoplimit(skb_dst(nskb)));
|
||||
nf_reject_ip_tcphdr_put(nskb, oldskb, oth);
|
||||
|
||||
if (ip_route_me_harder(nskb, RTN_UNSPEC))
|
||||
goto free_nskb;
|
||||
|
||||
niph->ttl = ip4_dst_hoplimit(skb_dst(nskb));
|
||||
|
||||
/* "Never happens" */
|
||||
if (nskb->len > dst_mtu(skb_dst(nskb)))
|
||||
goto free_nskb;
|
||||
|
||||
@ -12,20 +12,131 @@
|
||||
#include <net/ip6_fib.h>
|
||||
#include <net/ip6_checksum.h>
|
||||
#include <linux/netfilter_ipv6.h>
|
||||
#include <net/netfilter/ipv6/nf_reject.h>
|
||||
|
||||
const struct tcphdr *nf_reject_ip6_tcphdr_get(struct sk_buff *oldskb,
|
||||
struct tcphdr *otcph,
|
||||
unsigned int *otcplen, int hook)
|
||||
{
|
||||
const struct ipv6hdr *oip6h = ipv6_hdr(oldskb);
|
||||
u8 proto;
|
||||
__be16 frag_off;
|
||||
int tcphoff;
|
||||
|
||||
proto = oip6h->nexthdr;
|
||||
tcphoff = ipv6_skip_exthdr(oldskb, ((u8*)(oip6h+1) - oldskb->data),
|
||||
&proto, &frag_off);
|
||||
|
||||
if ((tcphoff < 0) || (tcphoff > oldskb->len)) {
|
||||
pr_debug("Cannot get TCP header.\n");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
*otcplen = oldskb->len - tcphoff;
|
||||
|
||||
/* IP header checks: fragment, too short. */
|
||||
if (proto != IPPROTO_TCP || *otcplen < sizeof(struct tcphdr)) {
|
||||
pr_debug("proto(%d) != IPPROTO_TCP or too short (len = %d)\n",
|
||||
proto, *otcplen);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
otcph = skb_header_pointer(oldskb, tcphoff, sizeof(struct tcphdr),
|
||||
otcph);
|
||||
if (otcph == NULL)
|
||||
return NULL;
|
||||
|
||||
/* No RST for RST. */
|
||||
if (otcph->rst) {
|
||||
pr_debug("RST is set\n");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* Check checksum. */
|
||||
if (nf_ip6_checksum(oldskb, hook, tcphoff, IPPROTO_TCP)) {
|
||||
pr_debug("TCP checksum is invalid\n");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return otcph;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(nf_reject_ip6_tcphdr_get);
|
||||
|
||||
struct ipv6hdr *nf_reject_ip6hdr_put(struct sk_buff *nskb,
|
||||
const struct sk_buff *oldskb,
|
||||
__be16 protocol, int hoplimit)
|
||||
{
|
||||
struct ipv6hdr *ip6h;
|
||||
const struct ipv6hdr *oip6h = ipv6_hdr(oldskb);
|
||||
#define DEFAULT_TOS_VALUE 0x0U
|
||||
const __u8 tclass = DEFAULT_TOS_VALUE;
|
||||
|
||||
skb_put(nskb, sizeof(struct ipv6hdr));
|
||||
skb_reset_network_header(nskb);
|
||||
ip6h = ipv6_hdr(nskb);
|
||||
ip6_flow_hdr(ip6h, tclass, 0);
|
||||
ip6h->hop_limit = hoplimit;
|
||||
ip6h->nexthdr = protocol;
|
||||
ip6h->saddr = oip6h->daddr;
|
||||
ip6h->daddr = oip6h->saddr;
|
||||
|
||||
nskb->protocol = htons(ETH_P_IPV6);
|
||||
|
||||
return ip6h;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(nf_reject_ip6hdr_put);
|
||||
|
||||
void nf_reject_ip6_tcphdr_put(struct sk_buff *nskb,
|
||||
const struct sk_buff *oldskb,
|
||||
const struct tcphdr *oth, unsigned int otcplen)
|
||||
{
|
||||
struct tcphdr *tcph;
|
||||
int needs_ack;
|
||||
|
||||
skb_reset_transport_header(nskb);
|
||||
tcph = (struct tcphdr *)skb_put(nskb, sizeof(struct tcphdr));
|
||||
/* Truncate to length (no data) */
|
||||
tcph->doff = sizeof(struct tcphdr)/4;
|
||||
tcph->source = oth->dest;
|
||||
tcph->dest = oth->source;
|
||||
|
||||
if (oth->ack) {
|
||||
needs_ack = 0;
|
||||
tcph->seq = oth->ack_seq;
|
||||
tcph->ack_seq = 0;
|
||||
} else {
|
||||
needs_ack = 1;
|
||||
tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin +
|
||||
otcplen - (oth->doff<<2));
|
||||
tcph->seq = 0;
|
||||
}
|
||||
|
||||
/* Reset flags */
|
||||
((u_int8_t *)tcph)[13] = 0;
|
||||
tcph->rst = 1;
|
||||
tcph->ack = needs_ack;
|
||||
tcph->window = 0;
|
||||
tcph->urg_ptr = 0;
|
||||
tcph->check = 0;
|
||||
|
||||
/* Adjust TCP checksum */
|
||||
tcph->check = csum_ipv6_magic(&ipv6_hdr(nskb)->saddr,
|
||||
&ipv6_hdr(nskb)->daddr,
|
||||
sizeof(struct tcphdr), IPPROTO_TCP,
|
||||
csum_partial(tcph,
|
||||
sizeof(struct tcphdr), 0));
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(nf_reject_ip6_tcphdr_put);
|
||||
|
||||
void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
|
||||
{
|
||||
struct sk_buff *nskb;
|
||||
struct tcphdr otcph, *tcph;
|
||||
struct tcphdr _otcph;
|
||||
const struct tcphdr *otcph;
|
||||
unsigned int otcplen, hh_len;
|
||||
int tcphoff, needs_ack;
|
||||
const struct ipv6hdr *oip6h = ipv6_hdr(oldskb);
|
||||
struct ipv6hdr *ip6h;
|
||||
#define DEFAULT_TOS_VALUE 0x0U
|
||||
const __u8 tclass = DEFAULT_TOS_VALUE;
|
||||
struct dst_entry *dst = NULL;
|
||||
u8 proto;
|
||||
__be16 frag_off;
|
||||
struct flowi6 fl6;
|
||||
|
||||
if ((!(ipv6_addr_type(&oip6h->saddr) & IPV6_ADDR_UNICAST)) ||
|
||||
@ -34,45 +145,16 @@ void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
|
||||
return;
|
||||
}
|
||||
|
||||
proto = oip6h->nexthdr;
|
||||
tcphoff = ipv6_skip_exthdr(oldskb, ((u8*)(oip6h+1) - oldskb->data), &proto, &frag_off);
|
||||
|
||||
if ((tcphoff < 0) || (tcphoff > oldskb->len)) {
|
||||
pr_debug("Cannot get TCP header.\n");
|
||||
otcph = nf_reject_ip6_tcphdr_get(oldskb, &_otcph, &otcplen, hook);
|
||||
if (!otcph)
|
||||
return;
|
||||
}
|
||||
|
||||
otcplen = oldskb->len - tcphoff;
|
||||
|
||||
/* IP header checks: fragment, too short. */
|
||||
if (proto != IPPROTO_TCP || otcplen < sizeof(struct tcphdr)) {
|
||||
pr_debug("proto(%d) != IPPROTO_TCP, "
|
||||
"or too short. otcplen = %d\n",
|
||||
proto, otcplen);
|
||||
return;
|
||||
}
|
||||
|
||||
if (skb_copy_bits(oldskb, tcphoff, &otcph, sizeof(struct tcphdr)))
|
||||
BUG();
|
||||
|
||||
/* No RST for RST. */
|
||||
if (otcph.rst) {
|
||||
pr_debug("RST is set\n");
|
||||
return;
|
||||
}
|
||||
|
||||
/* Check checksum. */
|
||||
if (nf_ip6_checksum(oldskb, hook, tcphoff, IPPROTO_TCP)) {
|
||||
pr_debug("TCP checksum is invalid\n");
|
||||
return;
|
||||
}
|
||||
|
||||
memset(&fl6, 0, sizeof(fl6));
|
||||
fl6.flowi6_proto = IPPROTO_TCP;
|
||||
fl6.saddr = oip6h->daddr;
|
||||
fl6.daddr = oip6h->saddr;
|
||||
fl6.fl6_sport = otcph.dest;
|
||||
fl6.fl6_dport = otcph.source;
|
||||
fl6.fl6_sport = otcph->dest;
|
||||
fl6.fl6_dport = otcph->source;
|
||||
security_skb_classify_flow(oldskb, flowi6_to_flowi(&fl6));
|
||||
dst = ip6_route_output(net, NULL, &fl6);
|
||||
if (dst == NULL || dst->error) {
|
||||
@ -97,48 +179,9 @@ void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
|
||||
skb_dst_set(nskb, dst);
|
||||
|
||||
skb_reserve(nskb, hh_len + dst->header_len);
|
||||
|
||||
skb_put(nskb, sizeof(struct ipv6hdr));
|
||||
skb_reset_network_header(nskb);
|
||||
ip6h = ipv6_hdr(nskb);
|
||||
ip6_flow_hdr(ip6h, tclass, 0);
|
||||
ip6h->hop_limit = ip6_dst_hoplimit(dst);
|
||||
ip6h->nexthdr = IPPROTO_TCP;
|
||||
ip6h->saddr = oip6h->daddr;
|
||||
ip6h->daddr = oip6h->saddr;
|
||||
|
||||
skb_reset_transport_header(nskb);
|
||||
tcph = (struct tcphdr *)skb_put(nskb, sizeof(struct tcphdr));
|
||||
/* Truncate to length (no data) */
|
||||
tcph->doff = sizeof(struct tcphdr)/4;
|
||||
tcph->source = otcph.dest;
|
||||
tcph->dest = otcph.source;
|
||||
|
||||
if (otcph.ack) {
|
||||
needs_ack = 0;
|
||||
tcph->seq = otcph.ack_seq;
|
||||
tcph->ack_seq = 0;
|
||||
} else {
|
||||
needs_ack = 1;
|
||||
tcph->ack_seq = htonl(ntohl(otcph.seq) + otcph.syn + otcph.fin
|
||||
+ otcplen - (otcph.doff<<2));
|
||||
tcph->seq = 0;
|
||||
}
|
||||
|
||||
/* Reset flags */
|
||||
((u_int8_t *)tcph)[13] = 0;
|
||||
tcph->rst = 1;
|
||||
tcph->ack = needs_ack;
|
||||
tcph->window = 0;
|
||||
tcph->urg_ptr = 0;
|
||||
tcph->check = 0;
|
||||
|
||||
/* Adjust TCP checksum */
|
||||
tcph->check = csum_ipv6_magic(&ipv6_hdr(nskb)->saddr,
|
||||
&ipv6_hdr(nskb)->daddr,
|
||||
sizeof(struct tcphdr), IPPROTO_TCP,
|
||||
csum_partial(tcph,
|
||||
sizeof(struct tcphdr), 0));
|
||||
ip6h = nf_reject_ip6hdr_put(nskb, oldskb, IPPROTO_TCP,
|
||||
ip6_dst_hoplimit(dst));
|
||||
nf_reject_ip6_tcphdr_put(nskb, oldskb, otcph, otcplen);
|
||||
|
||||
nf_ct_attach(nskb, oldskb);
|
||||
|
||||
|
||||
@ -316,7 +316,7 @@ __ip_vs_get_out_rt(int skb_af, struct sk_buff *skb, struct ip_vs_dest *dest,
|
||||
if (unlikely(crosses_local_route_boundary(skb_af, skb, rt_mode,
|
||||
local))) {
|
||||
IP_VS_DBG_RL("We are crossing local and non-local addresses"
|
||||
" daddr=%pI4\n", &dest->addr.ip);
|
||||
" daddr=%pI4\n", &daddr);
|
||||
goto err_put;
|
||||
}
|
||||
|
||||
@ -458,7 +458,7 @@ __ip_vs_get_out_rt_v6(int skb_af, struct sk_buff *skb, struct ip_vs_dest *dest,
|
||||
if (unlikely(crosses_local_route_boundary(skb_af, skb, rt_mode,
|
||||
local))) {
|
||||
IP_VS_DBG_RL("We are crossing local and non-local addresses"
|
||||
" daddr=%pI6\n", &dest->addr.in6);
|
||||
" daddr=%pI6\n", daddr);
|
||||
goto err_put;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user