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-rw-r--r--net/batman-adv/multicast.c4
-rw-r--r--net/bridge/br_multicast.c57
-rw-r--r--net/ipv4/igmp.c23
-rw-r--r--net/ipv6/mcast_snoop.c24
4 files changed, 38 insertions, 70 deletions
diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index 69244e4598f5..1dd70f048e7b 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -674,7 +674,7 @@ static void batadv_mcast_mla_update(struct work_struct *work)
*/
static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb)
{
- if (ip_mc_check_igmp(skb, NULL) < 0)
+ if (ip_mc_check_igmp(skb) < 0)
return false;
switch (igmp_hdr(skb)->type) {
@@ -741,7 +741,7 @@ static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv,
*/
static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb)
{
- if (ipv6_mc_check_mld(skb, NULL) < 0)
+ if (ipv6_mc_check_mld(skb) < 0)
return false;
switch (icmp6_hdr(skb)->icmp6_type) {
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 3aeff0895669..156c4905639e 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -938,7 +938,7 @@ static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
for (i = 0; i < num; i++) {
len += sizeof(*grec);
- if (!pskb_may_pull(skb, len))
+ if (!ip_mc_may_pull(skb, len))
return -EINVAL;
grec = (void *)(skb->data + len - sizeof(*grec));
@@ -946,7 +946,7 @@ static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
type = grec->grec_type;
len += ntohs(grec->grec_nsrcs) * 4;
- if (!pskb_may_pull(skb, len))
+ if (!ip_mc_may_pull(skb, len))
return -EINVAL;
/* We treat this as an IGMPv2 report for now. */
@@ -985,15 +985,17 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br,
struct sk_buff *skb,
u16 vid)
{
+ unsigned int nsrcs_offset;
const unsigned char *src;
struct icmp6hdr *icmp6h;
struct mld2_grec *grec;
+ unsigned int grec_len;
int i;
int len;
int num;
int err = 0;
- if (!pskb_may_pull(skb, sizeof(*icmp6h)))
+ if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
return -EINVAL;
icmp6h = icmp6_hdr(skb);
@@ -1003,21 +1005,25 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br,
for (i = 0; i < num; i++) {
__be16 *nsrcs, _nsrcs;
- nsrcs = skb_header_pointer(skb,
- len + offsetof(struct mld2_grec,
- grec_nsrcs),
+ nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
+
+ if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
+ nsrcs_offset + sizeof(_nsrcs))
+ return -EINVAL;
+
+ nsrcs = skb_header_pointer(skb, nsrcs_offset,
sizeof(_nsrcs), &_nsrcs);
if (!nsrcs)
return -EINVAL;
- if (!pskb_may_pull(skb,
- len + sizeof(*grec) +
- sizeof(struct in6_addr) * ntohs(*nsrcs)))
+ grec_len = sizeof(*grec) +
+ sizeof(struct in6_addr) * ntohs(*nsrcs);
+
+ if (!ipv6_mc_may_pull(skb, len + grec_len))
return -EINVAL;
grec = (struct mld2_grec *)(skb->data + len);
- len += sizeof(*grec) +
- sizeof(struct in6_addr) * ntohs(*nsrcs);
+ len += grec_len;
/* We treat these as MLDv1 reports for now. */
switch (grec->grec_type) {
@@ -1219,6 +1225,7 @@ static void br_ip4_multicast_query(struct net_bridge *br,
struct sk_buff *skb,
u16 vid)
{
+ unsigned int transport_len = ip_transport_len(skb);
const struct iphdr *iph = ip_hdr(skb);
struct igmphdr *ih = igmp_hdr(skb);
struct net_bridge_mdb_entry *mp;
@@ -1228,7 +1235,6 @@ static void br_ip4_multicast_query(struct net_bridge *br,
struct br_ip saddr;
unsigned long max_delay;
unsigned long now = jiffies;
- unsigned int offset = skb_transport_offset(skb);
__be32 group;
spin_lock(&br->multicast_lock);
@@ -1238,14 +1244,14 @@ static void br_ip4_multicast_query(struct net_bridge *br,
group = ih->group;
- if (skb->len == offset + sizeof(*ih)) {
+ if (transport_len == sizeof(*ih)) {
max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
if (!max_delay) {
max_delay = 10 * HZ;
group = 0;
}
- } else if (skb->len >= offset + sizeof(*ih3)) {
+ } else if (transport_len >= sizeof(*ih3)) {
ih3 = igmpv3_query_hdr(skb);
if (ih3->nsrcs)
goto out;
@@ -1296,6 +1302,7 @@ static int br_ip6_multicast_query(struct net_bridge *br,
struct sk_buff *skb,
u16 vid)
{
+ unsigned int transport_len = ipv6_transport_len(skb);
const struct ipv6hdr *ip6h = ipv6_hdr(skb);
struct mld_msg *mld;
struct net_bridge_mdb_entry *mp;
@@ -1315,7 +1322,7 @@ static int br_ip6_multicast_query(struct net_bridge *br,
(port && port->state == BR_STATE_DISABLED))
goto out;
- if (skb->len == offset + sizeof(*mld)) {
+ if (transport_len == sizeof(*mld)) {
if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
err = -EINVAL;
goto out;
@@ -1581,12 +1588,11 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br,
struct sk_buff *skb,
u16 vid)
{
- struct sk_buff *skb_trimmed = NULL;
const unsigned char *src;
struct igmphdr *ih;
int err;
- err = ip_mc_check_igmp(skb, &skb_trimmed);
+ err = ip_mc_check_igmp(skb);
if (err == -ENOMSG) {
if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
@@ -1612,19 +1618,16 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br,
err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
break;
case IGMPV3_HOST_MEMBERSHIP_REPORT:
- err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
+ err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
break;
case IGMP_HOST_MEMBERSHIP_QUERY:
- br_ip4_multicast_query(br, port, skb_trimmed, vid);
+ br_ip4_multicast_query(br, port, skb, vid);
break;
case IGMP_HOST_LEAVE_MESSAGE:
br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
break;
}
- if (skb_trimmed && skb_trimmed != skb)
- kfree_skb(skb_trimmed);
-
br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
BR_MCAST_DIR_RX);
@@ -1637,12 +1640,11 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
struct sk_buff *skb,
u16 vid)
{
- struct sk_buff *skb_trimmed = NULL;
const unsigned char *src;
struct mld_msg *mld;
int err;
- err = ipv6_mc_check_mld(skb, &skb_trimmed);
+ err = ipv6_mc_check_mld(skb);
if (err == -ENOMSG) {
if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
@@ -1664,10 +1666,10 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
src);
break;
case ICMPV6_MLD2_REPORT:
- err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
+ err = br_ip6_multicast_mld2_report(br, port, skb, vid);
break;
case ICMPV6_MGM_QUERY:
- err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
+ err = br_ip6_multicast_query(br, port, skb, vid);
break;
case ICMPV6_MGM_REDUCTION:
src = eth_hdr(skb)->h_source;
@@ -1675,9 +1677,6 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
break;
}
- if (skb_trimmed && skb_trimmed != skb)
- kfree_skb(skb_trimmed);
-
br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
BR_MCAST_DIR_RX);
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 765b2b32c4a4..b1f6d93282d7 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -1544,7 +1544,7 @@ static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
return skb_checksum_simple_validate(skb);
}
-static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
+static int __ip_mc_check_igmp(struct sk_buff *skb)
{
struct sk_buff *skb_chk;
@@ -1566,16 +1566,10 @@ static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
if (ret)
goto err;
- if (skb_trimmed)
- *skb_trimmed = skb_chk;
- /* free now unneeded clone */
- else if (skb_chk != skb)
- kfree_skb(skb_chk);
-
ret = 0;
err:
- if (ret && skb_chk && skb_chk != skb)
+ if (skb_chk && skb_chk != skb)
kfree_skb(skb_chk);
return ret;
@@ -1584,7 +1578,6 @@ err:
/**
* ip_mc_check_igmp - checks whether this is a sane IGMP packet
* @skb: the skb to validate
- * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
*
* Checks whether an IPv4 packet is a valid IGMP packet. If so sets
* skb transport header accordingly and returns zero.
@@ -1594,18 +1587,10 @@ err:
* -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
* -ENOMEM: A memory allocation failure happened.
*
- * Optionally, an skb pointer might be provided via skb_trimmed (or set it
- * to NULL): After parsing an IGMP packet successfully it will point to
- * an skb which has its tail aligned to the IP packet end. This might
- * either be the originally provided skb or a trimmed, cloned version if
- * the skb frame had data beyond the IP packet. A cloned skb allows us
- * to leave the original skb and its full frame unchanged (which might be
- * desirable for layer 2 frame jugglers).
- *
* Caller needs to set the skb network header and free any returned skb if it
* differs from the provided skb.
*/
-int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
+int ip_mc_check_igmp(struct sk_buff *skb)
{
int ret = ip_mc_check_iphdr(skb);
@@ -1615,7 +1600,7 @@ int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
return -ENOMSG;
- return __ip_mc_check_igmp(skb, skb_trimmed);
+ return __ip_mc_check_igmp(skb);
}
EXPORT_SYMBOL(ip_mc_check_igmp);
diff --git a/net/ipv6/mcast_snoop.c b/net/ipv6/mcast_snoop.c
index 9405b04eecc6..1a917dc80d5e 100644
--- a/net/ipv6/mcast_snoop.c
+++ b/net/ipv6/mcast_snoop.c
@@ -136,8 +136,7 @@ static inline __sum16 ipv6_mc_validate_checksum(struct sk_buff *skb)
return skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo);
}
-static int __ipv6_mc_check_mld(struct sk_buff *skb,
- struct sk_buff **skb_trimmed)
+static int __ipv6_mc_check_mld(struct sk_buff *skb)
{
struct sk_buff *skb_chk = NULL;
@@ -160,16 +159,10 @@ static int __ipv6_mc_check_mld(struct sk_buff *skb,
if (ret)
goto err;
- if (skb_trimmed)
- *skb_trimmed = skb_chk;
- /* free now unneeded clone */
- else if (skb_chk != skb)
- kfree_skb(skb_chk);
-
ret = 0;
err:
- if (ret && skb_chk && skb_chk != skb)
+ if (skb_chk && skb_chk != skb)
kfree_skb(skb_chk);
return ret;
@@ -178,7 +171,6 @@ err:
/**
* ipv6_mc_check_mld - checks whether this is a sane MLD packet
* @skb: the skb to validate
- * @skb_trimmed: to store an skb pointer trimmed to IPv6 packet tail (optional)
*
* Checks whether an IPv6 packet is a valid MLD packet. If so sets
* skb transport header accordingly and returns zero.
@@ -188,18 +180,10 @@ err:
* -ENOMSG: IP header validation succeeded but it is not an MLD packet.
* -ENOMEM: A memory allocation failure happened.
*
- * Optionally, an skb pointer might be provided via skb_trimmed (or set it
- * to NULL): After parsing an MLD packet successfully it will point to
- * an skb which has its tail aligned to the IP packet end. This might
- * either be the originally provided skb or a trimmed, cloned version if
- * the skb frame had data beyond the IP packet. A cloned skb allows us
- * to leave the original skb and its full frame unchanged (which might be
- * desirable for layer 2 frame jugglers).
- *
* Caller needs to set the skb network header and free any returned skb if it
* differs from the provided skb.
*/
-int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed)
+int ipv6_mc_check_mld(struct sk_buff *skb)
{
int ret;
@@ -211,6 +195,6 @@ int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed)
if (ret < 0)
return ret;
- return __ipv6_mc_check_mld(skb, skb_trimmed);
+ return __ipv6_mc_check_mld(skb);
}
EXPORT_SYMBOL(ipv6_mc_check_mld);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.