提交 4319cc0c 编写于 作者: F Fernando Luis Vazquez Cao 提交者: Pablo Neira Ayuso

netfilter: IPv6: initialize TOS field in REJECT target module

The IPv6 header is not zeroed out in alloc_skb so we must initialize
it properly unless we want to see IPv6 packets with random TOS fields
floating around. The current implementation resets the flow label
but this could be changed if deemed necessary.

We stumbled upon this issue when trying to apply a mangle rule to
the RST packet generated by the REJECT target module.
Signed-off-by: NFernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
上级 7a4f0761
......@@ -45,6 +45,8 @@ static void send_reset(struct net *net, struct sk_buff *oldskb)
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;
struct flowi6 fl6;
......@@ -124,7 +126,7 @@ static void send_reset(struct net *net, struct sk_buff *oldskb)
skb_put(nskb, sizeof(struct ipv6hdr));
skb_reset_network_header(nskb);
ip6h = ipv6_hdr(nskb);
ip6h->version = 6;
*(__be32 *)ip6h = htonl(0x60000000 | (tclass << 20));
ip6h->hop_limit = ip6_dst_hoplimit(dst);
ip6h->nexthdr = IPPROTO_TCP;
ipv6_addr_copy(&ip6h->saddr, &oip6h->daddr);
......
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