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authorYasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>2005-09-19 18:34:40 -0400
committerDavid S. Miller <davem@davemloft.net>2005-09-19 18:34:40 -0400
commite674d0f38de6109b59dbe30fba8b296a03229b8e (patch)
tree459271f7cef6319dfa7ca9ab050269c98e551994 /net/ipv6
parent926b50f92a30090da2c1a8675de954c2d9b09732 (diff)
[NETFILTER] ip6tables: remove duplicate code
Some IPv6 matches have very similar loops to find IPv6 extension header and we can unify them. This patch introduces ipv6_find_hdr() to do it. I just checked that it can find the target headers in the packet which has dst,hbh,rt,frag,ah,esp headers. Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/netfilter/ip6_tables.c52
-rw-r--r--net/ipv6/netfilter/ip6t_ah.c81
-rw-r--r--net/ipv6/netfilter/ip6t_dst.c88
-rw-r--r--net/ipv6/netfilter/ip6t_esp.c73
-rw-r--r--net/ipv6/netfilter/ip6t_frag.c90
-rw-r--r--net/ipv6/netfilter/ip6t_hbh.c88
-rw-r--r--net/ipv6/netfilter/ip6t_rt.c83
7 files changed, 91 insertions, 464 deletions
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 1cb8adb2787f..2da514b16d95 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -1955,6 +1955,57 @@ static void __exit fini(void)
1955#endif 1955#endif
1956} 1956}
1957 1957
1958/*
1959 * find specified header up to transport protocol header.
1960 * If found target header, the offset to the header is set to *offset
1961 * and return 0. otherwise, return -1.
1962 *
1963 * Notes: - non-1st Fragment Header isn't skipped.
1964 * - ESP header isn't skipped.
1965 * - The target header may be trancated.
1966 */
1967int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, u8 target)
1968{
1969 unsigned int start = (u8*)(skb->nh.ipv6h + 1) - skb->data;
1970 u8 nexthdr = skb->nh.ipv6h->nexthdr;
1971 unsigned int len = skb->len - start;
1972
1973 while (nexthdr != target) {
1974 struct ipv6_opt_hdr _hdr, *hp;
1975 unsigned int hdrlen;
1976
1977 if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE)
1978 return -1;
1979 hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr);
1980 if (hp == NULL)
1981 return -1;
1982 if (nexthdr == NEXTHDR_FRAGMENT) {
1983 unsigned short _frag_off, *fp;
1984 fp = skb_header_pointer(skb,
1985 start+offsetof(struct frag_hdr,
1986 frag_off),
1987 sizeof(_frag_off),
1988 &_frag_off);
1989 if (fp == NULL)
1990 return -1;
1991
1992 if (ntohs(*fp) & ~0x7)
1993 return -1;
1994 hdrlen = 8;
1995 } else if (nexthdr == NEXTHDR_AUTH)
1996 hdrlen = (hp->hdrlen + 2) << 2;
1997 else
1998 hdrlen = ipv6_optlen(hp);
1999
2000 nexthdr = hp->nexthdr;
2001 len -= hdrlen;
2002 start += hdrlen;
2003 }
2004
2005 *offset = start;
2006 return 0;
2007}
2008
1958EXPORT_SYMBOL(ip6t_register_table); 2009EXPORT_SYMBOL(ip6t_register_table);
1959EXPORT_SYMBOL(ip6t_unregister_table); 2010EXPORT_SYMBOL(ip6t_unregister_table);
1960EXPORT_SYMBOL(ip6t_do_table); 2011EXPORT_SYMBOL(ip6t_do_table);
@@ -1963,6 +2014,7 @@ EXPORT_SYMBOL(ip6t_unregister_match);
1963EXPORT_SYMBOL(ip6t_register_target); 2014EXPORT_SYMBOL(ip6t_register_target);
1964EXPORT_SYMBOL(ip6t_unregister_target); 2015EXPORT_SYMBOL(ip6t_unregister_target);
1965EXPORT_SYMBOL(ip6t_ext_hdr); 2016EXPORT_SYMBOL(ip6t_ext_hdr);
2017EXPORT_SYMBOL(ipv6_find_hdr);
1966 2018
1967module_init(init); 2019module_init(init);
1968module_exit(fini); 2020module_exit(fini);
diff --git a/net/ipv6/netfilter/ip6t_ah.c b/net/ipv6/netfilter/ip6t_ah.c
index d5b94f142bba..dde37793d20b 100644
--- a/net/ipv6/netfilter/ip6t_ah.c
+++ b/net/ipv6/netfilter/ip6t_ah.c
@@ -48,92 +48,21 @@ match(const struct sk_buff *skb,
48 unsigned int protoff, 48 unsigned int protoff,
49 int *hotdrop) 49 int *hotdrop)
50{ 50{
51 struct ip_auth_hdr *ah = NULL, _ah; 51 struct ip_auth_hdr *ah, _ah;
52 const struct ip6t_ah *ahinfo = matchinfo; 52 const struct ip6t_ah *ahinfo = matchinfo;
53 unsigned int temp;
54 int len;
55 u8 nexthdr;
56 unsigned int ptr; 53 unsigned int ptr;
57 unsigned int hdrlen = 0; 54 unsigned int hdrlen = 0;
58 55
59 /*DEBUGP("IPv6 AH entered\n");*/ 56 if (ipv6_find_hdr(skb, &ptr, NEXTHDR_AUTH) < 0)
60 /* if (opt->auth == 0) return 0;
61 * It does not filled on output */
62
63 /* type of the 1st exthdr */
64 nexthdr = skb->nh.ipv6h->nexthdr;
65 /* pointer to the 1st exthdr */
66 ptr = sizeof(struct ipv6hdr);
67 /* available length */
68 len = skb->len - ptr;
69 temp = 0;
70
71 while (ip6t_ext_hdr(nexthdr)) {
72 struct ipv6_opt_hdr _hdr, *hp;
73
74 DEBUGP("ipv6_ah header iteration \n");
75
76 /* Is there enough space for the next ext header? */
77 if (len < sizeof(struct ipv6_opt_hdr))
78 return 0;
79 /* No more exthdr -> evaluate */
80 if (nexthdr == NEXTHDR_NONE)
81 break;
82 /* ESP -> evaluate */
83 if (nexthdr == NEXTHDR_ESP)
84 break;
85
86 hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
87 BUG_ON(hp == NULL);
88
89 /* Calculate the header length */
90 if (nexthdr == NEXTHDR_FRAGMENT)
91 hdrlen = 8;
92 else if (nexthdr == NEXTHDR_AUTH)
93 hdrlen = (hp->hdrlen+2)<<2;
94 else
95 hdrlen = ipv6_optlen(hp);
96
97 /* AH -> evaluate */
98 if (nexthdr == NEXTHDR_AUTH) {
99 temp |= MASK_AH;
100 break;
101 }
102
103
104 /* set the flag */
105 switch (nexthdr) {
106 case NEXTHDR_HOP:
107 case NEXTHDR_ROUTING:
108 case NEXTHDR_FRAGMENT:
109 case NEXTHDR_AUTH:
110 case NEXTHDR_DEST:
111 break;
112 default:
113 DEBUGP("ipv6_ah match: unknown nextheader %u\n",nexthdr);
114 return 0;
115 }
116
117 nexthdr = hp->nexthdr;
118 len -= hdrlen;
119 ptr += hdrlen;
120 if (ptr > skb->len) {
121 DEBUGP("ipv6_ah: new pointer too large! \n");
122 break;
123 }
124 }
125
126 /* AH header not found */
127 if (temp != MASK_AH)
128 return 0; 57 return 0;
129 58
130 if (len < sizeof(struct ip_auth_hdr)){ 59 ah = skb_header_pointer(skb, ptr, sizeof(_ah), &_ah);
60 if (ah == NULL) {
131 *hotdrop = 1; 61 *hotdrop = 1;
132 return 0; 62 return 0;
133 } 63 }
134 64
135 ah = skb_header_pointer(skb, ptr, sizeof(_ah), &_ah); 65 hdrlen = (ah->hdrlen + 2) << 2;
136 BUG_ON(ah == NULL);
137 66
138 DEBUGP("IPv6 AH LEN %u %u ", hdrlen, ah->hdrlen); 67 DEBUGP("IPv6 AH LEN %u %u ", hdrlen, ah->hdrlen);
139 DEBUGP("RES %04X ", ah->reserved); 68 DEBUGP("RES %04X ", ah->reserved);
diff --git a/net/ipv6/netfilter/ip6t_dst.c b/net/ipv6/netfilter/ip6t_dst.c
index 540925e4a7a8..c450a635e54b 100644
--- a/net/ipv6/netfilter/ip6t_dst.c
+++ b/net/ipv6/netfilter/ip6t_dst.c
@@ -63,8 +63,6 @@ match(const struct sk_buff *skb,
63 struct ipv6_opt_hdr _optsh, *oh; 63 struct ipv6_opt_hdr _optsh, *oh;
64 const struct ip6t_opts *optinfo = matchinfo; 64 const struct ip6t_opts *optinfo = matchinfo;
65 unsigned int temp; 65 unsigned int temp;
66 unsigned int len;
67 u8 nexthdr;
68 unsigned int ptr; 66 unsigned int ptr;
69 unsigned int hdrlen = 0; 67 unsigned int hdrlen = 0;
70 unsigned int ret = 0; 68 unsigned int ret = 0;
@@ -72,97 +70,25 @@ match(const struct sk_buff *skb,
72 u8 _optlen, *lp = NULL; 70 u8 _optlen, *lp = NULL;
73 unsigned int optlen; 71 unsigned int optlen;
74 72
75 /* type of the 1st exthdr */
76 nexthdr = skb->nh.ipv6h->nexthdr;
77 /* pointer to the 1st exthdr */
78 ptr = sizeof(struct ipv6hdr);
79 /* available length */
80 len = skb->len - ptr;
81 temp = 0;
82
83 while (ip6t_ext_hdr(nexthdr)) {
84 struct ipv6_opt_hdr _hdr, *hp;
85
86 DEBUGP("ipv6_opts header iteration \n");
87
88 /* Is there enough space for the next ext header? */
89 if (len < (int)sizeof(struct ipv6_opt_hdr))
90 return 0;
91 /* No more exthdr -> evaluate */
92 if (nexthdr == NEXTHDR_NONE) {
93 break;
94 }
95 /* ESP -> evaluate */
96 if (nexthdr == NEXTHDR_ESP) {
97 break;
98 }
99
100 hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
101 BUG_ON(hp == NULL);
102
103 /* Calculate the header length */
104 if (nexthdr == NEXTHDR_FRAGMENT) {
105 hdrlen = 8;
106 } else if (nexthdr == NEXTHDR_AUTH)
107 hdrlen = (hp->hdrlen+2)<<2;
108 else
109 hdrlen = ipv6_optlen(hp);
110
111 /* OPTS -> evaluate */
112#if HOPBYHOP 73#if HOPBYHOP
113 if (nexthdr == NEXTHDR_HOP) { 74 if (ipv6_find_hdr(skb, &ptr, NEXTHDR_HOP) < 0)
114 temp |= MASK_HOPOPTS;
115#else 75#else
116 if (nexthdr == NEXTHDR_DEST) { 76 if (ipv6_find_hdr(skb, &ptr, NEXTHDR_DEST) < 0)
117 temp |= MASK_DSTOPTS;
118#endif 77#endif
119 break; 78 return 0;
120 }
121
122 79
123 /* set the flag */ 80 oh = skb_header_pointer(skb, ptr, sizeof(_optsh), &_optsh);
124 switch (nexthdr){ 81 if (oh == NULL){
125 case NEXTHDR_HOP:
126 case NEXTHDR_ROUTING:
127 case NEXTHDR_FRAGMENT:
128 case NEXTHDR_AUTH:
129 case NEXTHDR_DEST:
130 break;
131 default:
132 DEBUGP("ipv6_opts match: unknown nextheader %u\n",nexthdr);
133 return 0;
134 break;
135 }
136
137 nexthdr = hp->nexthdr;
138 len -= hdrlen;
139 ptr += hdrlen;
140 if ( ptr > skb->len ) {
141 DEBUGP("ipv6_opts: new pointer is too large! \n");
142 break;
143 }
144 }
145
146 /* OPTIONS header not found */
147#if HOPBYHOP
148 if ( temp != MASK_HOPOPTS ) return 0;
149#else
150 if ( temp != MASK_DSTOPTS ) return 0;
151#endif
152
153 if (len < (int)sizeof(struct ipv6_opt_hdr)){
154 *hotdrop = 1; 82 *hotdrop = 1;
155 return 0; 83 return 0;
156 } 84 }
157 85
158 if (len < hdrlen){ 86 hdrlen = ipv6_optlen(oh);
87 if (skb->len - ptr < hdrlen){
159 /* Packet smaller than it's length field */ 88 /* Packet smaller than it's length field */
160 return 0; 89 return 0;
161 } 90 }
162 91
163 oh = skb_header_pointer(skb, ptr, sizeof(_optsh), &_optsh);
164 BUG_ON(oh == NULL);
165
166 DEBUGP("IPv6 OPTS LEN %u %u ", hdrlen, oh->hdrlen); 92 DEBUGP("IPv6 OPTS LEN %u %u ", hdrlen, oh->hdrlen);
167 93
168 DEBUGP("len %02X %04X %02X ", 94 DEBUGP("len %02X %04X %02X ",
diff --git a/net/ipv6/netfilter/ip6t_esp.c b/net/ipv6/netfilter/ip6t_esp.c
index e39dd236fd8e..24bc0cde43a1 100644
--- a/net/ipv6/netfilter/ip6t_esp.c
+++ b/net/ipv6/netfilter/ip6t_esp.c
@@ -48,87 +48,22 @@ match(const struct sk_buff *skb,
48 unsigned int protoff, 48 unsigned int protoff,
49 int *hotdrop) 49 int *hotdrop)
50{ 50{
51 struct ip_esp_hdr _esp, *eh = NULL; 51 struct ip_esp_hdr _esp, *eh;
52 const struct ip6t_esp *espinfo = matchinfo; 52 const struct ip6t_esp *espinfo = matchinfo;
53 unsigned int temp;
54 int len;
55 u8 nexthdr;
56 unsigned int ptr; 53 unsigned int ptr;
57 54
58 /* Make sure this isn't an evil packet */ 55 /* Make sure this isn't an evil packet */
59 /*DEBUGP("ipv6_esp entered \n");*/ 56 /*DEBUGP("ipv6_esp entered \n");*/
60 57
61 /* type of the 1st exthdr */ 58 if (ipv6_find_hdr(skb, &ptr, NEXTHDR_ESP) < 0)
62 nexthdr = skb->nh.ipv6h->nexthdr;
63 /* pointer to the 1st exthdr */
64 ptr = sizeof(struct ipv6hdr);
65 /* available length */
66 len = skb->len - ptr;
67 temp = 0;
68
69 while (ip6t_ext_hdr(nexthdr)) {
70 struct ipv6_opt_hdr _hdr, *hp;
71 int hdrlen;
72
73 DEBUGP("ipv6_esp header iteration \n");
74
75 /* Is there enough space for the next ext header? */
76 if (len < sizeof(struct ipv6_opt_hdr))
77 return 0;
78 /* No more exthdr -> evaluate */
79 if (nexthdr == NEXTHDR_NONE)
80 break;
81 /* ESP -> evaluate */
82 if (nexthdr == NEXTHDR_ESP) {
83 temp |= MASK_ESP;
84 break;
85 }
86
87 hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
88 BUG_ON(hp == NULL);
89
90 /* Calculate the header length */
91 if (nexthdr == NEXTHDR_FRAGMENT)
92 hdrlen = 8;
93 else if (nexthdr == NEXTHDR_AUTH)
94 hdrlen = (hp->hdrlen+2)<<2;
95 else
96 hdrlen = ipv6_optlen(hp);
97
98 /* set the flag */
99 switch (nexthdr) {
100 case NEXTHDR_HOP:
101 case NEXTHDR_ROUTING:
102 case NEXTHDR_FRAGMENT:
103 case NEXTHDR_AUTH:
104 case NEXTHDR_DEST:
105 break;
106 default:
107 DEBUGP("ipv6_esp match: unknown nextheader %u\n",nexthdr);
108 return 0;
109 }
110
111 nexthdr = hp->nexthdr;
112 len -= hdrlen;
113 ptr += hdrlen;
114 if (ptr > skb->len) {
115 DEBUGP("ipv6_esp: new pointer too large! \n");
116 break;
117 }
118 }
119
120 /* ESP header not found */
121 if (temp != MASK_ESP)
122 return 0; 59 return 0;
123 60
124 if (len < sizeof(struct ip_esp_hdr)) { 61 eh = skb_header_pointer(skb, ptr, sizeof(_esp), &_esp);
62 if (eh == NULL) {
125 *hotdrop = 1; 63 *hotdrop = 1;
126 return 0; 64 return 0;
127 } 65 }
128 66
129 eh = skb_header_pointer(skb, ptr, sizeof(_esp), &_esp);
130 BUG_ON(eh == NULL);
131
132 DEBUGP("IPv6 ESP SPI %u %08X\n", ntohl(eh->spi), ntohl(eh->spi)); 67 DEBUGP("IPv6 ESP SPI %u %08X\n", ntohl(eh->spi), ntohl(eh->spi));
133 68
134 return (eh != NULL) 69 return (eh != NULL)
diff --git a/net/ipv6/netfilter/ip6t_frag.c b/net/ipv6/netfilter/ip6t_frag.c
index 4bfa30a9bc80..085d5f8eea29 100644
--- a/net/ipv6/netfilter/ip6t_frag.c
+++ b/net/ipv6/netfilter/ip6t_frag.c
@@ -48,90 +48,18 @@ match(const struct sk_buff *skb,
48 unsigned int protoff, 48 unsigned int protoff,
49 int *hotdrop) 49 int *hotdrop)
50{ 50{
51 struct frag_hdr _frag, *fh = NULL; 51 struct frag_hdr _frag, *fh;
52 const struct ip6t_frag *fraginfo = matchinfo; 52 const struct ip6t_frag *fraginfo = matchinfo;
53 unsigned int temp;
54 int len;
55 u8 nexthdr;
56 unsigned int ptr; 53 unsigned int ptr;
57 unsigned int hdrlen = 0;
58
59 /* type of the 1st exthdr */
60 nexthdr = skb->nh.ipv6h->nexthdr;
61 /* pointer to the 1st exthdr */
62 ptr = sizeof(struct ipv6hdr);
63 /* available length */
64 len = skb->len - ptr;
65 temp = 0;
66
67 while (ip6t_ext_hdr(nexthdr)) {
68 struct ipv6_opt_hdr _hdr, *hp;
69
70 DEBUGP("ipv6_frag header iteration \n");
71
72 /* Is there enough space for the next ext header? */
73 if (len < (int)sizeof(struct ipv6_opt_hdr))
74 return 0;
75 /* No more exthdr -> evaluate */
76 if (nexthdr == NEXTHDR_NONE) {
77 break;
78 }
79 /* ESP -> evaluate */
80 if (nexthdr == NEXTHDR_ESP) {
81 break;
82 }
83
84 hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
85 BUG_ON(hp == NULL);
86
87 /* Calculate the header length */
88 if (nexthdr == NEXTHDR_FRAGMENT) {
89 hdrlen = 8;
90 } else if (nexthdr == NEXTHDR_AUTH)
91 hdrlen = (hp->hdrlen+2)<<2;
92 else
93 hdrlen = ipv6_optlen(hp);
94
95 /* FRAG -> evaluate */
96 if (nexthdr == NEXTHDR_FRAGMENT) {
97 temp |= MASK_FRAGMENT;
98 break;
99 }
100
101
102 /* set the flag */
103 switch (nexthdr){
104 case NEXTHDR_HOP:
105 case NEXTHDR_ROUTING:
106 case NEXTHDR_FRAGMENT:
107 case NEXTHDR_AUTH:
108 case NEXTHDR_DEST:
109 break;
110 default:
111 DEBUGP("ipv6_frag match: unknown nextheader %u\n",nexthdr);
112 return 0;
113 break;
114 }
115
116 nexthdr = hp->nexthdr;
117 len -= hdrlen;
118 ptr += hdrlen;
119 if ( ptr > skb->len ) {
120 DEBUGP("ipv6_frag: new pointer too large! \n");
121 break;
122 }
123 }
124
125 /* FRAG header not found */
126 if ( temp != MASK_FRAGMENT ) return 0;
127
128 if (len < sizeof(struct frag_hdr)){
129 *hotdrop = 1;
130 return 0;
131 }
132 54
133 fh = skb_header_pointer(skb, ptr, sizeof(_frag), &_frag); 55 if (ipv6_find_hdr(skb, &ptr, NEXTHDR_FRAGMENT) < 0)
134 BUG_ON(fh == NULL); 56 return 0;
57
58 fh = skb_header_pointer(skb, ptr, sizeof(_frag), &_frag);
59 if (fh == NULL){
60 *hotdrop = 1;
61 return 0;
62 }
135 63
136 DEBUGP("INFO %04X ", fh->frag_off); 64 DEBUGP("INFO %04X ", fh->frag_off);
137 DEBUGP("OFFSET %04X ", ntohs(fh->frag_off) & ~0x7); 65 DEBUGP("OFFSET %04X ", ntohs(fh->frag_off) & ~0x7);
diff --git a/net/ipv6/netfilter/ip6t_hbh.c b/net/ipv6/netfilter/ip6t_hbh.c
index 27f3650d127e..1d09485111d0 100644
--- a/net/ipv6/netfilter/ip6t_hbh.c
+++ b/net/ipv6/netfilter/ip6t_hbh.c
@@ -63,8 +63,6 @@ match(const struct sk_buff *skb,
63 struct ipv6_opt_hdr _optsh, *oh; 63 struct ipv6_opt_hdr _optsh, *oh;
64 const struct ip6t_opts *optinfo = matchinfo; 64 const struct ip6t_opts *optinfo = matchinfo;
65 unsigned int temp; 65 unsigned int temp;
66 unsigned int len;
67 u8 nexthdr;
68 unsigned int ptr; 66 unsigned int ptr;
69 unsigned int hdrlen = 0; 67 unsigned int hdrlen = 0;
70 unsigned int ret = 0; 68 unsigned int ret = 0;
@@ -72,97 +70,25 @@ match(const struct sk_buff *skb,
72 u8 _optlen, *lp = NULL; 70 u8 _optlen, *lp = NULL;
73 unsigned int optlen; 71 unsigned int optlen;
74 72
75 /* type of the 1st exthdr */
76 nexthdr = skb->nh.ipv6h->nexthdr;
77 /* pointer to the 1st exthdr */
78 ptr = sizeof(struct ipv6hdr);
79 /* available length */
80 len = skb->len - ptr;
81 temp = 0;
82
83 while (ip6t_ext_hdr(nexthdr)) {
84 struct ipv6_opt_hdr _hdr, *hp;
85
86 DEBUGP("ipv6_opts header iteration \n");
87
88 /* Is there enough space for the next ext header? */
89 if (len < (int)sizeof(struct ipv6_opt_hdr))
90 return 0;
91 /* No more exthdr -> evaluate */
92 if (nexthdr == NEXTHDR_NONE) {
93 break;
94 }
95 /* ESP -> evaluate */
96 if (nexthdr == NEXTHDR_ESP) {
97 break;
98 }
99
100 hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
101 BUG_ON(hp == NULL);
102
103 /* Calculate the header length */
104 if (nexthdr == NEXTHDR_FRAGMENT) {
105 hdrlen = 8;
106 } else if (nexthdr == NEXTHDR_AUTH)
107 hdrlen = (hp->hdrlen+2)<<2;
108 else
109 hdrlen = ipv6_optlen(hp);
110
111 /* OPTS -> evaluate */
112#if HOPBYHOP 73#if HOPBYHOP
113 if (nexthdr == NEXTHDR_HOP) { 74 if (ipv6_find_hdr(skb, &ptr, NEXTHDR_HOP) < 0)
114 temp |= MASK_HOPOPTS;
115#else 75#else
116 if (nexthdr == NEXTHDR_DEST) { 76 if (ipv6_find_hdr(skb, &ptr, NEXTHDR_DEST) < 0)
117 temp |= MASK_DSTOPTS;
118#endif 77#endif
119 break; 78 return 0;
120 }
121
122 79
123 /* set the flag */ 80 oh = skb_header_pointer(skb, ptr, sizeof(_optsh), &_optsh);
124 switch (nexthdr){ 81 if (oh == NULL){
125 case NEXTHDR_HOP:
126 case NEXTHDR_ROUTING:
127 case NEXTHDR_FRAGMENT:
128 case NEXTHDR_AUTH:
129 case NEXTHDR_DEST:
130 break;
131 default:
132 DEBUGP("ipv6_opts match: unknown nextheader %u\n",nexthdr);
133 return 0;
134 break;
135 }
136
137 nexthdr = hp->nexthdr;
138 len -= hdrlen;
139 ptr += hdrlen;
140 if ( ptr > skb->len ) {
141 DEBUGP("ipv6_opts: new pointer is too large! \n");
142 break;
143 }
144 }
145
146 /* OPTIONS header not found */
147#if HOPBYHOP
148 if ( temp != MASK_HOPOPTS ) return 0;
149#else
150 if ( temp != MASK_DSTOPTS ) return 0;
151#endif
152
153 if (len < (int)sizeof(struct ipv6_opt_hdr)){
154 *hotdrop = 1; 82 *hotdrop = 1;
155 return 0; 83 return 0;
156 } 84 }
157 85
158 if (len < hdrlen){ 86 hdrlen = ipv6_optlen(oh);
87 if (skb->len - ptr < hdrlen){
159 /* Packet smaller than it's length field */ 88 /* Packet smaller than it's length field */
160 return 0; 89 return 0;
161 } 90 }
162 91
163 oh = skb_header_pointer(skb, ptr, sizeof(_optsh), &_optsh);
164 BUG_ON(oh == NULL);
165
166 DEBUGP("IPv6 OPTS LEN %u %u ", hdrlen, oh->hdrlen); 92 DEBUGP("IPv6 OPTS LEN %u %u ", hdrlen, oh->hdrlen);
167 93
168 DEBUGP("len %02X %04X %02X ", 94 DEBUGP("len %02X %04X %02X ",
diff --git a/net/ipv6/netfilter/ip6t_rt.c b/net/ipv6/netfilter/ip6t_rt.c
index 2bb670037df3..beb2fd5cebbb 100644
--- a/net/ipv6/netfilter/ip6t_rt.c
+++ b/net/ipv6/netfilter/ip6t_rt.c
@@ -50,98 +50,29 @@ match(const struct sk_buff *skb,
50 unsigned int protoff, 50 unsigned int protoff,
51 int *hotdrop) 51 int *hotdrop)
52{ 52{
53 struct ipv6_rt_hdr _route, *rh = NULL; 53 struct ipv6_rt_hdr _route, *rh;
54 const struct ip6t_rt *rtinfo = matchinfo; 54 const struct ip6t_rt *rtinfo = matchinfo;
55 unsigned int temp; 55 unsigned int temp;
56 unsigned int len;
57 u8 nexthdr;
58 unsigned int ptr; 56 unsigned int ptr;
59 unsigned int hdrlen = 0; 57 unsigned int hdrlen = 0;
60 unsigned int ret = 0; 58 unsigned int ret = 0;
61 struct in6_addr *ap, _addr; 59 struct in6_addr *ap, _addr;
62 60
63 /* type of the 1st exthdr */ 61 if (ipv6_find_hdr(skb, &ptr, NEXTHDR_ROUTING) < 0)
64 nexthdr = skb->nh.ipv6h->nexthdr; 62 return 0;
65 /* pointer to the 1st exthdr */
66 ptr = sizeof(struct ipv6hdr);
67 /* available length */
68 len = skb->len - ptr;
69 temp = 0;
70 63
71 while (ip6t_ext_hdr(nexthdr)) { 64 rh = skb_header_pointer(skb, ptr, sizeof(_route), &_route);
72 struct ipv6_opt_hdr _hdr, *hp; 65 if (rh == NULL){
73
74 DEBUGP("ipv6_rt header iteration \n");
75
76 /* Is there enough space for the next ext header? */
77 if (len < (int)sizeof(struct ipv6_opt_hdr))
78 return 0;
79 /* No more exthdr -> evaluate */
80 if (nexthdr == NEXTHDR_NONE) {
81 break;
82 }
83 /* ESP -> evaluate */
84 if (nexthdr == NEXTHDR_ESP) {
85 break;
86 }
87
88 hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
89 BUG_ON(hp == NULL);
90
91 /* Calculate the header length */
92 if (nexthdr == NEXTHDR_FRAGMENT) {
93 hdrlen = 8;
94 } else if (nexthdr == NEXTHDR_AUTH)
95 hdrlen = (hp->hdrlen+2)<<2;
96 else
97 hdrlen = ipv6_optlen(hp);
98
99 /* ROUTING -> evaluate */
100 if (nexthdr == NEXTHDR_ROUTING) {
101 temp |= MASK_ROUTING;
102 break;
103 }
104
105
106 /* set the flag */
107 switch (nexthdr){
108 case NEXTHDR_HOP:
109 case NEXTHDR_ROUTING:
110 case NEXTHDR_FRAGMENT:
111 case NEXTHDR_AUTH:
112 case NEXTHDR_DEST:
113 break;
114 default:
115 DEBUGP("ipv6_rt match: unknown nextheader %u\n",nexthdr);
116 return 0;
117 break;
118 }
119
120 nexthdr = hp->nexthdr;
121 len -= hdrlen;
122 ptr += hdrlen;
123 if ( ptr > skb->len ) {
124 DEBUGP("ipv6_rt: new pointer is too large! \n");
125 break;
126 }
127 }
128
129 /* ROUTING header not found */
130 if ( temp != MASK_ROUTING ) return 0;
131
132 if (len < (int)sizeof(struct ipv6_rt_hdr)){
133 *hotdrop = 1; 66 *hotdrop = 1;
134 return 0; 67 return 0;
135 } 68 }
136 69
137 if (len < hdrlen){ 70 hdrlen = ipv6_optlen(rh);
71 if (skb->len - ptr < hdrlen){
138 /* Pcket smaller than its length field */ 72 /* Pcket smaller than its length field */
139 return 0; 73 return 0;
140 } 74 }
141 75
142 rh = skb_header_pointer(skb, ptr, sizeof(_route), &_route);
143 BUG_ON(rh == NULL);
144
145 DEBUGP("IPv6 RT LEN %u %u ", hdrlen, rh->hdrlen); 76 DEBUGP("IPv6 RT LEN %u %u ", hdrlen, rh->hdrlen);
146 DEBUGP("TYPE %04X ", rh->type); 77 DEBUGP("TYPE %04X ", rh->type);
147 DEBUGP("SGS_LEFT %u %02X\n", rh->segments_left, rh->segments_left); 78 DEBUGP("SGS_LEFT %u %02X\n", rh->segments_left, rh->segments_left);
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-03 01:24:26 -0400