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-rw-r--r--include/net/ipv6.h2
-rw-r--r--net/bridge/br_multicast.c3
-rw-r--r--net/bridge/netfilter/ebt_ip6.c3
-rw-r--r--net/bridge/netfilter/ebt_log.c3
-rw-r--r--net/ipv6/exthdrs_core.c11
-rw-r--r--net/ipv6/icmp.c7
-rw-r--r--net/ipv6/ip6_input.c3
-rw-r--r--net/ipv6/ip6_output.c3
-rw-r--r--net/ipv6/netfilter/ip6t_REJECT.c3
-rw-r--r--net/netfilter/ipset/ip_set_getport.c4
-rw-r--r--net/netfilter/xt_AUDIT.c3
-rw-r--r--net/netfilter/xt_TCPMSS.c3
-rw-r--r--net/netfilter/xt_TCPOPTSTRIP.c3
-rw-r--r--net/netfilter/xt_hashlimit.c3
-rw-r--r--net/netfilter/xt_socket.c4
-rw-r--r--security/lsm_audit.c3
-rw-r--r--security/selinux/hooks.c3
17 files changed, 45 insertions, 19 deletions
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index f35188e002d9..e4170a22fc6f 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -558,7 +558,7 @@ extern void ipv6_push_frag_opts(struct sk_buff *skb,
u8 *proto);
extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
- u8 *nexthdrp);
+ u8 *nexthdrp, __be16 *frag_offp);
extern int ipv6_ext_hdr(u8 nexthdr);
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 7743e0d109ea..375417e633c9 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1458,6 +1458,7 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
const struct ipv6hdr *ip6h;
u8 icmp6_type;
u8 nexthdr;
+ __be16 frag_off;
unsigned len;
int offset;
int err;
@@ -1483,7 +1484,7 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
return -EINVAL;
nexthdr = ip6h->nexthdr;
- offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr);
+ offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
return 0;
diff --git a/net/bridge/netfilter/ebt_ip6.c b/net/bridge/netfilter/ebt_ip6.c
index 2ed0056a39a8..99c85668f551 100644
--- a/net/bridge/netfilter/ebt_ip6.c
+++ b/net/bridge/netfilter/ebt_ip6.c
@@ -55,9 +55,10 @@ ebt_ip6_mt(const struct sk_buff *skb, struct xt_action_param *par)
return false;
if (info->bitmask & EBT_IP6_PROTO) {
uint8_t nexthdr = ih6->nexthdr;
+ __be16 frag_off;
int offset_ph;
- offset_ph = ipv6_skip_exthdr(skb, sizeof(_ip6h), &nexthdr);
+ offset_ph = ipv6_skip_exthdr(skb, sizeof(_ip6h), &nexthdr, &frag_off);
if (offset_ph == -1)
return false;
if (FWINV(info->protocol != nexthdr, EBT_IP6_PROTO))
diff --git a/net/bridge/netfilter/ebt_log.c b/net/bridge/netfilter/ebt_log.c
index 6e5a8bb9b940..88d7d1d1cb1b 100644
--- a/net/bridge/netfilter/ebt_log.c
+++ b/net/bridge/netfilter/ebt_log.c
@@ -113,6 +113,7 @@ ebt_log_packet(u_int8_t pf, unsigned int hooknum,
const struct ipv6hdr *ih;
struct ipv6hdr _iph;
uint8_t nexthdr;
+ __be16 frag_off;
int offset_ph;
ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
@@ -123,7 +124,7 @@ ebt_log_packet(u_int8_t pf, unsigned int hooknum,
printk(" IPv6 SRC=%pI6 IPv6 DST=%pI6, IPv6 priority=0x%01X, Next Header=%d",
&ih->saddr, &ih->daddr, ih->priority, ih->nexthdr);
nexthdr = ih->nexthdr;
- offset_ph = ipv6_skip_exthdr(skb, sizeof(_iph), &nexthdr);
+ offset_ph = ipv6_skip_exthdr(skb, sizeof(_iph), &nexthdr, &frag_off);
if (offset_ph == -1)
goto out;
print_ports(skb, nexthdr, offset_ph);
diff --git a/net/ipv6/exthdrs_core.c b/net/ipv6/exthdrs_core.c
index 37f548b7f6dc..72957f4a7c6c 100644
--- a/net/ipv6/exthdrs_core.c
+++ b/net/ipv6/exthdrs_core.c
@@ -57,6 +57,9 @@ int ipv6_ext_hdr(u8 nexthdr)
* it returns NULL.
* - First fragment header is skipped, not-first ones
* are considered as unparsable.
+ * - Reports the offset field of the final fragment header so it is
+ * possible to tell whether this is a first fragment, later fragment,
+ * or not fragmented.
* - ESP is unparsable for now and considered like
* normal payload protocol.
* - Note also special handling of AUTH header. Thanks to IPsec wizards.
@@ -64,10 +67,13 @@ int ipv6_ext_hdr(u8 nexthdr)
* --ANK (980726)
*/
-int ipv6_skip_exthdr(const struct sk_buff *skb, int start, u8 *nexthdrp)
+int ipv6_skip_exthdr(const struct sk_buff *skb, int start, u8 *nexthdrp,
+ __be16 *frag_offp)
{
u8 nexthdr = *nexthdrp;
+ *frag_offp = 0;
+
while (ipv6_ext_hdr(nexthdr)) {
struct ipv6_opt_hdr _hdr, *hp;
int hdrlen;
@@ -87,7 +93,8 @@ int ipv6_skip_exthdr(const struct sk_buff *skb, int start, u8 *nexthdrp)
if (fp == NULL)
return -1;
- if (ntohs(*fp) & ~0x7)
+ *frag_offp = *fp;
+ if (ntohs(*frag_offp) & ~0x7)
break;
hdrlen = 8;
} else if (nexthdr == NEXTHDR_AUTH)
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 9e2bdccf9143..01d46bff63c3 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -135,11 +135,12 @@ static int is_ineligible(struct sk_buff *skb)
int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data;
int len = skb->len - ptr;
__u8 nexthdr = ipv6_hdr(skb)->nexthdr;
+ __be16 frag_off;
if (len < 0)
return 1;
- ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr);
+ ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off);
if (ptr < 0)
return 0;
if (nexthdr == IPPROTO_ICMPV6) {
@@ -596,6 +597,7 @@ static void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
int inner_offset;
int hash;
u8 nexthdr;
+ __be16 frag_off;
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
return;
@@ -603,7 +605,8 @@ static void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr;
if (ipv6_ext_hdr(nexthdr)) {
/* now skip over extension headers */
- inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr);
+ inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
+ &nexthdr, &frag_off);
if (inner_offset<0)
return;
} else {
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index a46c64eb0a66..1ca5d45a12e8 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -280,6 +280,7 @@ int ip6_mc_input(struct sk_buff *skb)
u8 *ptr = skb_network_header(skb) + opt->ra;
struct icmp6hdr *icmp6;
u8 nexthdr = hdr->nexthdr;
+ __be16 frag_off;
int offset;
/* Check if the value of Router Alert
@@ -293,7 +294,7 @@ int ip6_mc_input(struct sk_buff *skb)
goto out;
}
offset = ipv6_skip_exthdr(skb, sizeof(*hdr),
- &nexthdr);
+ &nexthdr, &frag_off);
if (offset < 0)
goto out;
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index a24e15557843..3221bc675654 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -329,10 +329,11 @@ static int ip6_forward_proxy_check(struct sk_buff *skb)
{
struct ipv6hdr *hdr = ipv6_hdr(skb);
u8 nexthdr = hdr->nexthdr;
+ __be16 frag_off;
int offset;
if (ipv6_ext_hdr(nexthdr)) {
- offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr);
+ offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off);
if (offset < 0)
return 0;
} else
diff --git a/net/ipv6/netfilter/ip6t_REJECT.c b/net/ipv6/netfilter/ip6t_REJECT.c
index b5a2aa58a03a..aad2fa41cf46 100644
--- a/net/ipv6/netfilter/ip6t_REJECT.c
+++ b/net/ipv6/netfilter/ip6t_REJECT.c
@@ -49,6 +49,7 @@ static void send_reset(struct net *net, struct sk_buff *oldskb)
const __u8 tclass = DEFAULT_TOS_VALUE;
struct dst_entry *dst = NULL;
u8 proto;
+ __be16 frag_off;
struct flowi6 fl6;
if ((!(ipv6_addr_type(&oip6h->saddr) & IPV6_ADDR_UNICAST)) ||
@@ -58,7 +59,7 @@ static void send_reset(struct net *net, struct sk_buff *oldskb)
}
proto = oip6h->nexthdr;
- tcphoff = ipv6_skip_exthdr(oldskb, ((u8*)(oip6h+1) - oldskb->data), &proto);
+ tcphoff = ipv6_skip_exthdr(oldskb, ((u8*)(oip6h+1) - oldskb->data), &proto, &frag_off);
if ((tcphoff < 0) || (tcphoff > oldskb->len)) {
pr_debug("Cannot get TCP header.\n");
diff --git a/net/netfilter/ipset/ip_set_getport.c b/net/netfilter/ipset/ip_set_getport.c
index 052579fe389a..b71a6e7ab0a5 100644
--- a/net/netfilter/ipset/ip_set_getport.c
+++ b/net/netfilter/ipset/ip_set_getport.c
@@ -116,9 +116,11 @@ ip_set_get_ip6_port(const struct sk_buff *skb, bool src,
{
int protoff;
u8 nexthdr;
+ __be16 frag_off;
nexthdr = ipv6_hdr(skb)->nexthdr;
- protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr);
+ protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr,
+ &frag_off);
if (protoff < 0)
return false;
diff --git a/net/netfilter/xt_AUDIT.c b/net/netfilter/xt_AUDIT.c
index 4bca15a0c385..ba92824086f3 100644
--- a/net/netfilter/xt_AUDIT.c
+++ b/net/netfilter/xt_AUDIT.c
@@ -98,6 +98,7 @@ static void audit_ip6(struct audit_buffer *ab, struct sk_buff *skb)
struct ipv6hdr _ip6h;
const struct ipv6hdr *ih;
u8 nexthdr;
+ __be16 frag_off;
int offset;
ih = skb_header_pointer(skb, skb_network_offset(skb), sizeof(_ip6h), &_ip6h);
@@ -108,7 +109,7 @@ static void audit_ip6(struct audit_buffer *ab, struct sk_buff *skb)
nexthdr = ih->nexthdr;
offset = ipv6_skip_exthdr(skb, skb_network_offset(skb) + sizeof(_ip6h),
- &nexthdr);
+ &nexthdr, &frag_off);
audit_log_format(ab, " saddr=%pI6c daddr=%pI6c proto=%hhu",
&ih->saddr, &ih->daddr, nexthdr);
diff --git a/net/netfilter/xt_TCPMSS.c b/net/netfilter/xt_TCPMSS.c
index 3ecade3966d5..ba722621ed25 100644
--- a/net/netfilter/xt_TCPMSS.c
+++ b/net/netfilter/xt_TCPMSS.c
@@ -204,11 +204,12 @@ tcpmss_tg6(struct sk_buff *skb, const struct xt_action_param *par)
{
struct ipv6hdr *ipv6h = ipv6_hdr(skb);
u8 nexthdr;
+ __be16 frag_off;
int tcphoff;
int ret;
nexthdr = ipv6h->nexthdr;
- tcphoff = ipv6_skip_exthdr(skb, sizeof(*ipv6h), &nexthdr);
+ tcphoff = ipv6_skip_exthdr(skb, sizeof(*ipv6h), &nexthdr, &frag_off);
if (tcphoff < 0)
return NF_DROP;
ret = tcpmss_mangle_packet(skb, par->targinfo,
diff --git a/net/netfilter/xt_TCPOPTSTRIP.c b/net/netfilter/xt_TCPOPTSTRIP.c
index 9dc9ecfdd546..3a295cc734bd 100644
--- a/net/netfilter/xt_TCPOPTSTRIP.c
+++ b/net/netfilter/xt_TCPOPTSTRIP.c
@@ -87,9 +87,10 @@ tcpoptstrip_tg6(struct sk_buff *skb, const struct xt_action_param *par)
struct ipv6hdr *ipv6h = ipv6_hdr(skb);
int tcphoff;
u_int8_t nexthdr;
+ __be16 frag_off;
nexthdr = ipv6h->nexthdr;
- tcphoff = ipv6_skip_exthdr(skb, sizeof(*ipv6h), &nexthdr);
+ tcphoff = ipv6_skip_exthdr(skb, sizeof(*ipv6h), &nexthdr, &frag_off);
if (tcphoff < 0)
return NF_DROP;
diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index dfd52bad1523..068698f64791 100644
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -445,6 +445,7 @@ hashlimit_init_dst(const struct xt_hashlimit_htable *hinfo,
{
__be16 _ports[2], *ports;
u8 nexthdr;
+ __be16 frag_off;
int poff;
memset(dst, 0, sizeof(*dst));
@@ -480,7 +481,7 @@ hashlimit_init_dst(const struct xt_hashlimit_htable *hinfo,
(XT_HASHLIMIT_HASH_DPT | XT_HASHLIMIT_HASH_SPT)))
return 0;
nexthdr = ipv6_hdr(skb)->nexthdr;
- protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr);
+ protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, &frag_off);
if ((int)protoff < 0)
return -1;
break;
diff --git a/net/netfilter/xt_socket.c b/net/netfilter/xt_socket.c
index fe39f7e913df..c302e30dc50c 100644
--- a/net/netfilter/xt_socket.c
+++ b/net/netfilter/xt_socket.c
@@ -214,6 +214,7 @@ extract_icmp6_fields(const struct sk_buff *skb,
struct icmp6hdr *icmph, _icmph;
__be16 *ports, _ports[2];
u8 inside_nexthdr;
+ __be16 inside_fragoff;
int inside_hdrlen;
icmph = skb_header_pointer(skb, outside_hdrlen,
@@ -229,7 +230,8 @@ extract_icmp6_fields(const struct sk_buff *skb,
return 1;
inside_nexthdr = inside_iph->nexthdr;
- inside_hdrlen = ipv6_skip_exthdr(skb, outside_hdrlen + sizeof(_icmph) + sizeof(_inside_iph), &inside_nexthdr);
+ inside_hdrlen = ipv6_skip_exthdr(skb, outside_hdrlen + sizeof(_icmph) + sizeof(_inside_iph),
+ &inside_nexthdr, &inside_fragoff);
if (inside_hdrlen < 0)
return 1; /* hjm: Packet has no/incomplete transport layer headers. */
diff --git a/security/lsm_audit.c b/security/lsm_audit.c
index 199616bb68d3..7bd6f138236b 100644
--- a/security/lsm_audit.c
+++ b/security/lsm_audit.c
@@ -114,6 +114,7 @@ int ipv6_skb_to_auditdata(struct sk_buff *skb,
int offset, ret = 0;
struct ipv6hdr *ip6;
u8 nexthdr;
+ __be16 frag_off;
ip6 = ipv6_hdr(skb);
if (ip6 == NULL)
@@ -126,7 +127,7 @@ int ipv6_skb_to_auditdata(struct sk_buff *skb,
offset = skb_network_offset(skb);
offset += sizeof(*ip6);
nexthdr = ip6->nexthdr;
- offset = ipv6_skip_exthdr(skb, offset, &nexthdr);
+ offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
if (offset < 0)
return 0;
if (proto)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 7e6c2564e741..cca09bb46502 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3561,6 +3561,7 @@ static int selinux_parse_skb_ipv6(struct sk_buff *skb,
u8 nexthdr;
int ret = -EINVAL, offset;
struct ipv6hdr _ipv6h, *ip6;
+ __be16 frag_off;
offset = skb_network_offset(skb);
ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
@@ -3573,7 +3574,7 @@ static int selinux_parse_skb_ipv6(struct sk_buff *skb,
nexthdr = ip6->nexthdr;
offset += sizeof(_ipv6h);
- offset = ipv6_skip_exthdr(skb, offset, &nexthdr);
+ offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
if (offset < 0)
goto out;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.