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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef _NF_LOG_H |
| 3 | #define _NF_LOG_H |
| 4 | |
| 5 | #include <linux/netfilter.h> |
| 6 | #include <linux/netfilter/nf_log.h> |
| 7 | |
| 8 | /* Log tcp sequence, tcp options, ip options and uid owning local socket */ |
| 9 | #define NF_LOG_DEFAULT_MASK 0x0f |
| 10 | |
| 11 | /* This flag indicates that copy_len field in nf_loginfo is set */ |
| 12 | #define NF_LOG_F_COPY_LEN 0x1 |
| 13 | |
| 14 | enum nf_log_type { |
| 15 | NF_LOG_TYPE_LOG = 0, |
| 16 | NF_LOG_TYPE_ULOG, |
| 17 | NF_LOG_TYPE_MAX |
| 18 | }; |
| 19 | |
| 20 | struct nf_loginfo { |
| 21 | u_int8_t type; |
| 22 | union { |
| 23 | struct { |
| 24 | /* copy_len will be used iff you set |
| 25 | * NF_LOG_F_COPY_LEN in flags |
| 26 | */ |
| 27 | u_int32_t copy_len; |
| 28 | u_int16_t group; |
| 29 | u_int16_t qthreshold; |
| 30 | u_int16_t flags; |
| 31 | } ulog; |
| 32 | struct { |
| 33 | u_int8_t level; |
| 34 | u_int8_t logflags; |
| 35 | } log; |
| 36 | } u; |
| 37 | }; |
| 38 | |
| 39 | typedef void nf_logfn(struct net *net, |
| 40 | u_int8_t pf, |
| 41 | unsigned int hooknum, |
| 42 | const struct sk_buff *skb, |
| 43 | const struct net_device *in, |
| 44 | const struct net_device *out, |
| 45 | const struct nf_loginfo *li, |
| 46 | const char *prefix); |
| 47 | |
| 48 | struct nf_logger { |
| 49 | char *name; |
| 50 | enum nf_log_type type; |
| 51 | nf_logfn *logfn; |
| 52 | struct module *me; |
| 53 | }; |
| 54 | |
| 55 | /* sysctl_nf_log_all_netns - allow LOG target in all network namespaces */ |
| 56 | extern int sysctl_nf_log_all_netns; |
| 57 | |
| 58 | /* Function to register/unregister log function. */ |
| 59 | int nf_log_register(u_int8_t pf, struct nf_logger *logger); |
| 60 | void nf_log_unregister(struct nf_logger *logger); |
| 61 | |
| 62 | /* Check if any logger is registered for a given protocol family. */ |
| 63 | bool nf_log_is_registered(u_int8_t pf); |
| 64 | |
| 65 | int nf_log_set(struct net *net, u_int8_t pf, const struct nf_logger *logger); |
| 66 | void nf_log_unset(struct net *net, const struct nf_logger *logger); |
| 67 | |
| 68 | int nf_log_bind_pf(struct net *net, u_int8_t pf, |
| 69 | const struct nf_logger *logger); |
| 70 | void nf_log_unbind_pf(struct net *net, u_int8_t pf); |
| 71 | |
| 72 | int nf_logger_find_get(int pf, enum nf_log_type type); |
| 73 | void nf_logger_put(int pf, enum nf_log_type type); |
| 74 | |
| 75 | #define MODULE_ALIAS_NF_LOGGER(family, type) \ |
| 76 | MODULE_ALIAS("nf-logger-" __stringify(family) "-" __stringify(type)) |
| 77 | |
| 78 | /* Calls the registered backend logging function */ |
| 79 | __printf(8, 9) |
| 80 | void nf_log_packet(struct net *net, |
| 81 | u_int8_t pf, |
| 82 | unsigned int hooknum, |
| 83 | const struct sk_buff *skb, |
| 84 | const struct net_device *in, |
| 85 | const struct net_device *out, |
| 86 | const struct nf_loginfo *li, |
| 87 | const char *fmt, ...); |
| 88 | |
| 89 | __printf(8, 9) |
| 90 | void nf_log_trace(struct net *net, |
| 91 | u_int8_t pf, |
| 92 | unsigned int hooknum, |
| 93 | const struct sk_buff *skb, |
| 94 | const struct net_device *in, |
| 95 | const struct net_device *out, |
| 96 | const struct nf_loginfo *li, |
| 97 | const char *fmt, ...); |
| 98 | |
| 99 | struct nf_log_buf; |
| 100 | |
| 101 | struct nf_log_buf *nf_log_buf_open(void); |
| 102 | __printf(2, 3) int nf_log_buf_add(struct nf_log_buf *m, const char *f, ...); |
| 103 | void nf_log_buf_close(struct nf_log_buf *m); |
| 104 | #endif /* _NF_LOG_H */ |
| 105 |
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