X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=net%2Fnetfilter%2Fxt_tcpudp.c;h=4fa3b669f691d6956e2b11b24c5059eebe7f385b;hb=4f4ae0d42680889c62db4e1f3e6b4aa7787a7257;hp=46414b562a199fe93af514b53d068c00fd7b7023;hpb=cfee47f99bc14a6d7c6b0be2284db2cef310a815;p=linux-2.6 diff --git a/net/netfilter/xt_tcpudp.c b/net/netfilter/xt_tcpudp.c index 46414b562a..4fa3b669f6 100644 --- a/net/netfilter/xt_tcpudp.c +++ b/net/netfilter/xt_tcpudp.c @@ -10,7 +10,7 @@ #include #include -MODULE_DESCRIPTION("x_tables match for TCP and UDP(-Lite), supports IPv4 and IPv6"); +MODULE_DESCRIPTION("Xtables: TCP, UDP and UDP-Lite match"); MODULE_LICENSE("GPL"); MODULE_ALIAS("xt_tcp"); MODULE_ALIAS("xt_udp"); @@ -27,22 +27,19 @@ MODULE_ALIAS("ip6t_tcp"); /* Returns 1 if the port is matched by the range, 0 otherwise */ -static inline int -port_match(u_int16_t min, u_int16_t max, u_int16_t port, int invert) +static inline bool +port_match(u_int16_t min, u_int16_t max, u_int16_t port, bool invert) { - int ret; - - ret = (port >= min && port <= max) ^ invert; - return ret; + return (port >= min && port <= max) ^ invert; } -static int +static bool tcp_find_option(u_int8_t option, const struct sk_buff *skb, unsigned int protoff, unsigned int optlen, - int invert, - int *hotdrop) + bool invert, + bool *hotdrop) { /* tcp.doff is only 4 bits, ie. max 15 * 4 bytes */ u_int8_t _opt[60 - sizeof(struct tcphdr)], *op; @@ -57,8 +54,8 @@ tcp_find_option(u_int8_t option, op = skb_header_pointer(skb, protoff + sizeof(struct tcphdr), optlen, _opt); if (op == NULL) { - *hotdrop = 1; - return 0; + *hotdrop = true; + return false; } for (i = 0; i < optlen; ) { @@ -70,15 +67,10 @@ tcp_find_option(u_int8_t option, return invert; } -static int -tcp_match(const struct sk_buff *skb, - const struct net_device *in, - const struct net_device *out, - const struct xt_match *match, - const void *matchinfo, - int offset, - unsigned int protoff, - int *hotdrop) +static bool +tcp_mt(const struct sk_buff *skb, const struct net_device *in, + const struct net_device *out, const struct xt_match *match, + const void *matchinfo, int offset, unsigned int protoff, bool *hotdrop) { struct tcphdr _tcph, *th; const struct xt_tcp *tcpinfo = matchinfo; @@ -92,56 +84,54 @@ tcp_match(const struct sk_buff *skb, */ if (offset == 1) { duprintf("Dropping evil TCP offset=1 frag.\n"); - *hotdrop = 1; + *hotdrop = true; } /* Must not be a fragment. */ - return 0; + return false; } -#define FWINVTCP(bool,invflg) ((bool) ^ !!(tcpinfo->invflags & invflg)) +#define FWINVTCP(bool, invflg) ((bool) ^ !!(tcpinfo->invflags & (invflg))) th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph); if (th == NULL) { /* We've been asked to examine this packet, and we can't. Hence, no choice but to drop. */ duprintf("Dropping evil TCP offset=0 tinygram.\n"); - *hotdrop = 1; - return 0; + *hotdrop = true; + return false; } if (!port_match(tcpinfo->spts[0], tcpinfo->spts[1], ntohs(th->source), !!(tcpinfo->invflags & XT_TCP_INV_SRCPT))) - return 0; + return false; if (!port_match(tcpinfo->dpts[0], tcpinfo->dpts[1], ntohs(th->dest), !!(tcpinfo->invflags & XT_TCP_INV_DSTPT))) - return 0; + return false; if (!FWINVTCP((((unsigned char *)th)[13] & tcpinfo->flg_mask) == tcpinfo->flg_cmp, XT_TCP_INV_FLAGS)) - return 0; + return false; if (tcpinfo->option) { if (th->doff * 4 < sizeof(_tcph)) { - *hotdrop = 1; - return 0; + *hotdrop = true; + return false; } if (!tcp_find_option(tcpinfo->option, skb, protoff, th->doff*4 - sizeof(_tcph), tcpinfo->invflags & XT_TCP_INV_OPTION, hotdrop)) - return 0; + return false; } - return 1; + return true; } /* Called when user tries to insert an entry of this type. */ -static int -tcp_checkentry(const char *tablename, - const void *info, - const struct xt_match *match, - void *matchinfo, - unsigned int hook_mask) +static bool +tcp_mt_check(const char *tablename, const void *info, + const struct xt_match *match, void *matchinfo, + unsigned int hook_mask) { const struct xt_tcp *tcpinfo = matchinfo; @@ -149,30 +139,25 @@ tcp_checkentry(const char *tablename, return !(tcpinfo->invflags & ~XT_TCP_INV_MASK); } -static int -udp_match(const struct sk_buff *skb, - const struct net_device *in, - const struct net_device *out, - const struct xt_match *match, - const void *matchinfo, - int offset, - unsigned int protoff, - int *hotdrop) +static bool +udp_mt(const struct sk_buff *skb, const struct net_device *in, + const struct net_device *out, const struct xt_match *match, + const void *matchinfo, int offset, unsigned int protoff, bool *hotdrop) { struct udphdr _udph, *uh; const struct xt_udp *udpinfo = matchinfo; /* Must not be a fragment. */ if (offset) - return 0; + return false; uh = skb_header_pointer(skb, protoff, sizeof(_udph), &_udph); if (uh == NULL) { /* We've been asked to examine this packet, and we can't. Hence, no choice but to drop. */ duprintf("Dropping evil UDP tinygram.\n"); - *hotdrop = 1; - return 0; + *hotdrop = true; + return false; } return port_match(udpinfo->spts[0], udpinfo->spts[1], @@ -184,25 +169,23 @@ udp_match(const struct sk_buff *skb, } /* Called when user tries to insert an entry of this type. */ -static int -udp_checkentry(const char *tablename, - const void *info, - const struct xt_match *match, - void *matchinfo, - unsigned int hook_mask) +static bool +udp_mt_check(const char *tablename, const void *info, + const struct xt_match *match, void *matchinfo, + unsigned int hook_mask) { - const struct xt_tcp *udpinfo = matchinfo; + const struct xt_udp *udpinfo = matchinfo; /* Must specify no unknown invflags */ return !(udpinfo->invflags & ~XT_UDP_INV_MASK); } -static struct xt_match xt_tcpudp_match[] = { +static struct xt_match tcpudp_mt_reg[] __read_mostly = { { .name = "tcp", .family = AF_INET, - .checkentry = tcp_checkentry, - .match = tcp_match, + .checkentry = tcp_mt_check, + .match = tcp_mt, .matchsize = sizeof(struct xt_tcp), .proto = IPPROTO_TCP, .me = THIS_MODULE, @@ -210,8 +193,8 @@ static struct xt_match xt_tcpudp_match[] = { { .name = "tcp", .family = AF_INET6, - .checkentry = tcp_checkentry, - .match = tcp_match, + .checkentry = tcp_mt_check, + .match = tcp_mt, .matchsize = sizeof(struct xt_tcp), .proto = IPPROTO_TCP, .me = THIS_MODULE, @@ -219,8 +202,8 @@ static struct xt_match xt_tcpudp_match[] = { { .name = "udp", .family = AF_INET, - .checkentry = udp_checkentry, - .match = udp_match, + .checkentry = udp_mt_check, + .match = udp_mt, .matchsize = sizeof(struct xt_udp), .proto = IPPROTO_UDP, .me = THIS_MODULE, @@ -228,8 +211,8 @@ static struct xt_match xt_tcpudp_match[] = { { .name = "udp", .family = AF_INET6, - .checkentry = udp_checkentry, - .match = udp_match, + .checkentry = udp_mt_check, + .match = udp_mt, .matchsize = sizeof(struct xt_udp), .proto = IPPROTO_UDP, .me = THIS_MODULE, @@ -237,8 +220,8 @@ static struct xt_match xt_tcpudp_match[] = { { .name = "udplite", .family = AF_INET, - .checkentry = udp_checkentry, - .match = udp_match, + .checkentry = udp_mt_check, + .match = udp_mt, .matchsize = sizeof(struct xt_udp), .proto = IPPROTO_UDPLITE, .me = THIS_MODULE, @@ -246,24 +229,23 @@ static struct xt_match xt_tcpudp_match[] = { { .name = "udplite", .family = AF_INET6, - .checkentry = udp_checkentry, - .match = udp_match, + .checkentry = udp_mt_check, + .match = udp_mt, .matchsize = sizeof(struct xt_udp), .proto = IPPROTO_UDPLITE, .me = THIS_MODULE, }, }; -static int __init xt_tcpudp_init(void) +static int __init tcpudp_mt_init(void) { - return xt_register_matches(xt_tcpudp_match, - ARRAY_SIZE(xt_tcpudp_match)); + return xt_register_matches(tcpudp_mt_reg, ARRAY_SIZE(tcpudp_mt_reg)); } -static void __exit xt_tcpudp_fini(void) +static void __exit tcpudp_mt_exit(void) { - xt_unregister_matches(xt_tcpudp_match, ARRAY_SIZE(xt_tcpudp_match)); + xt_unregister_matches(tcpudp_mt_reg, ARRAY_SIZE(tcpudp_mt_reg)); } -module_init(xt_tcpudp_init); -module_exit(xt_tcpudp_fini); +module_init(tcpudp_mt_init); +module_exit(tcpudp_mt_exit);