diff options
Diffstat (limited to 'net/batman-adv/multicast.c')
| -rw-r--r-- | net/batman-adv/multicast.c | 87 |
1 files changed, 74 insertions, 13 deletions
diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c index c32f24fafe67..4673328def29 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -25,9 +25,11 @@ #include <linux/errno.h> #include <linux/etherdevice.h> #include <linux/fs.h> +#include <linux/icmpv6.h> #include <linux/if_ether.h> -#include <linux/in6.h> +#include <linux/igmp.h> #include <linux/in.h> +#include <linux/in6.h> #include <linux/ip.h> #include <linux/ipv6.h> #include <linux/kref.h> @@ -236,7 +238,7 @@ static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) if (batadv_mcast_has_bridge(bat_priv)) { if (bat_priv->mcast.enabled) { batadv_tvlv_container_unregister(bat_priv, - BATADV_TVLV_MCAST, 1); + BATADV_TVLV_MCAST, 2); bat_priv->mcast.enabled = false; } @@ -245,7 +247,7 @@ static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) if (!bat_priv->mcast.enabled || mcast_data.flags != bat_priv->mcast.flags) { - batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 1, + batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 2, &mcast_data, sizeof(mcast_data)); bat_priv->mcast.flags = mcast_data.flags; bat_priv->mcast.enabled = true; @@ -283,6 +285,31 @@ out: } /** + * batadv_mcast_is_report_ipv4 - check for IGMP reports + * @skb: the ethernet frame destined for the mesh + * + * This call might reallocate skb data. + * + * Checks whether the given frame is a valid IGMP report. + * + * Return: If so then true, otherwise false. + */ +static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb) +{ + if (ip_mc_check_igmp(skb, NULL) < 0) + return false; + + switch (igmp_hdr(skb)->type) { + case IGMP_HOST_MEMBERSHIP_REPORT: + case IGMPV2_HOST_MEMBERSHIP_REPORT: + case IGMPV3_HOST_MEMBERSHIP_REPORT: + return true; + } + + return false; +} + +/** * batadv_mcast_forw_mode_check_ipv4 - check for optimized forwarding potential * @bat_priv: the bat priv with all the soft interface information * @skb: the IPv4 packet to check @@ -304,6 +331,9 @@ static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr))) return -ENOMEM; + if (batadv_mcast_is_report_ipv4(skb)) + return -EINVAL; + iphdr = ip_hdr(skb); /* TODO: Implement Multicast Router Discovery (RFC4286), @@ -320,6 +350,31 @@ static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, return 0; } +#if IS_ENABLED(CONFIG_IPV6) +/** + * batadv_mcast_is_report_ipv6 - check for MLD reports + * @skb: the ethernet frame destined for the mesh + * + * This call might reallocate skb data. + * + * Checks whether the given frame is a valid MLD report. + * + * Return: If so then true, otherwise false. + */ +static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb) +{ + if (ipv6_mc_check_mld(skb, NULL) < 0) + return false; + + switch (icmp6_hdr(skb)->icmp6_type) { + case ICMPV6_MGM_REPORT: + case ICMPV6_MLD2_REPORT: + return true; + } + + return false; +} + /** * batadv_mcast_forw_mode_check_ipv6 - check for optimized forwarding potential * @bat_priv: the bat priv with all the soft interface information @@ -341,6 +396,9 @@ static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr))) return -ENOMEM; + if (batadv_mcast_is_report_ipv6(skb)) + return -EINVAL; + ip6hdr = ipv6_hdr(skb); /* TODO: Implement Multicast Router Discovery (RFC4286), @@ -357,6 +415,7 @@ static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, return 0; } +#endif /** * batadv_mcast_forw_mode_check - check for optimized forwarding potential @@ -385,9 +444,11 @@ static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, case ETH_P_IP: return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb, is_unsnoopable); +#if IS_ENABLED(CONFIG_IPV6) case ETH_P_IPV6: return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb, is_unsnoopable); +#endif default: return -EINVAL; } @@ -728,18 +789,18 @@ static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, } /** - * batadv_mcast_tvlv_ogm_handler_v1 - process incoming multicast tvlv container + * batadv_mcast_tvlv_ogm_handler - process incoming multicast tvlv container * @bat_priv: the bat priv with all the soft interface information * @orig: the orig_node of the ogm * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) * @tvlv_value: tvlv buffer containing the multicast data * @tvlv_value_len: tvlv buffer length */ -static void batadv_mcast_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, - struct batadv_orig_node *orig, - u8 flags, - void *tvlv_value, - u16 tvlv_value_len) +static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + u8 flags, + void *tvlv_value, + u16 tvlv_value_len) { bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); u8 mcast_flags = BATADV_NO_FLAGS; @@ -789,8 +850,8 @@ static void batadv_mcast_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, */ void batadv_mcast_init(struct batadv_priv *bat_priv) { - batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler_v1, - NULL, BATADV_TVLV_MCAST, 1, + batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler, + NULL, BATADV_TVLV_MCAST, 2, BATADV_TVLV_HANDLER_OGM_CIFNOTFND); } @@ -800,8 +861,8 @@ void batadv_mcast_init(struct batadv_priv *bat_priv) */ void batadv_mcast_free(struct batadv_priv *bat_priv) { - batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 1); - batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 1); + batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2); + batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2); spin_lock_bh(&bat_priv->tt.commit_lock); batadv_mcast_mla_tt_retract(bat_priv, NULL); |