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https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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080774a243
Add ctnetlink subsystem for userspace-access to ip_conntrack table. This allows reading and updating of existing entries, as well as creating new ones (and new expect's) via nfnetlink. Please note the 'strange' byte order: nfattr (tag+length) are in host byte order, while the payload is always guaranteed to be in network byte order. This allows a simple userspace process to encapsulate netlink messages into arch-independent udp packets by just processing/swapping the headers and not knowing anything about the actual payload. Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
95 lines
3.2 KiB
C
95 lines
3.2 KiB
C
/* Header for use in defining a given protocol for connection tracking. */
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#ifndef _IP_CONNTRACK_PROTOCOL_H
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#define _IP_CONNTRACK_PROTOCOL_H
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#include <linux/netfilter_ipv4/ip_conntrack.h>
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#include <linux/netfilter/nfnetlink_conntrack.h>
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struct seq_file;
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struct ip_conntrack_protocol
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{
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/* Protocol number. */
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u_int8_t proto;
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/* Protocol name */
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const char *name;
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/* Try to fill in the third arg: dataoff is offset past IP
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hdr. Return true if possible. */
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int (*pkt_to_tuple)(const struct sk_buff *skb,
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unsigned int dataoff,
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struct ip_conntrack_tuple *tuple);
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/* Invert the per-proto part of the tuple: ie. turn xmit into reply.
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* Some packets can't be inverted: return 0 in that case.
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*/
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int (*invert_tuple)(struct ip_conntrack_tuple *inverse,
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const struct ip_conntrack_tuple *orig);
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/* Print out the per-protocol part of the tuple. Return like seq_* */
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int (*print_tuple)(struct seq_file *,
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const struct ip_conntrack_tuple *);
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/* Print out the private part of the conntrack. */
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int (*print_conntrack)(struct seq_file *, const struct ip_conntrack *);
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/* Returns verdict for packet, or -1 for invalid. */
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int (*packet)(struct ip_conntrack *conntrack,
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const struct sk_buff *skb,
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enum ip_conntrack_info ctinfo);
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/* Called when a new connection for this protocol found;
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* returns TRUE if it's OK. If so, packet() called next. */
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int (*new)(struct ip_conntrack *conntrack, const struct sk_buff *skb);
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/* Called when a conntrack entry is destroyed */
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void (*destroy)(struct ip_conntrack *conntrack);
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int (*error)(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
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unsigned int hooknum);
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/* convert protoinfo to nfnetink attributes */
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int (*to_nfattr)(struct sk_buff *skb, struct nfattr *nfa,
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const struct ip_conntrack *ct);
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int (*tuple_to_nfattr)(struct sk_buff *skb,
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const struct ip_conntrack_tuple *t);
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int (*nfattr_to_tuple)(struct nfattr *tb[],
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struct ip_conntrack_tuple *t);
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/* Module (if any) which this is connected to. */
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struct module *me;
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};
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/* Protocol registration. */
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extern int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto);
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extern void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto);
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/* Existing built-in protocols */
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extern struct ip_conntrack_protocol ip_conntrack_protocol_tcp;
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extern struct ip_conntrack_protocol ip_conntrack_protocol_udp;
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extern struct ip_conntrack_protocol ip_conntrack_protocol_icmp;
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extern struct ip_conntrack_protocol ip_conntrack_generic_protocol;
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extern int ip_conntrack_protocol_tcp_init(void);
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/* Log invalid packets */
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extern unsigned int ip_ct_log_invalid;
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extern int ip_ct_port_tuple_to_nfattr(struct sk_buff *,
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const struct ip_conntrack_tuple *);
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extern int ip_ct_port_nfattr_to_tuple(struct nfattr *tb[],
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struct ip_conntrack_tuple *);
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#ifdef CONFIG_SYSCTL
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#ifdef DEBUG_INVALID_PACKETS
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#define LOG_INVALID(proto) \
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(ip_ct_log_invalid == (proto) || ip_ct_log_invalid == IPPROTO_RAW)
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#else
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#define LOG_INVALID(proto) \
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((ip_ct_log_invalid == (proto) || ip_ct_log_invalid == IPPROTO_RAW) \
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&& net_ratelimit())
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#endif
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#else
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#define LOG_INVALID(proto) 0
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#endif /* CONFIG_SYSCTL */
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#endif /*_IP_CONNTRACK_PROTOCOL_H*/
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