The ethernet header is 14 bytes long. Therefore, the data after it is not 4 byte aligned and may cause problems on systems without unaligned data access. Reserving NET_IP_ALIGN more bytes can fix the misalignment of the ethernet header.
Signed-off-by: Sven Eckelmann <[email protected]> --- bat_iv_ogm.c | 2 +- icmp_socket.c | 2 +- translation-table.c | 10 +++++----- vis.c | 4 ++-- 4 files changed, 9 insertions(+), 9 deletions(-) diff --git a/bat_iv_ogm.c b/bat_iv_ogm.c index 75403a4..5be9a3e 100644 --- a/bat_iv_ogm.c +++ b/bat_iv_ogm.c @@ -422,7 +422,7 @@ static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, kfree(forw_packet_aggr); goto out; } - skb_reserve(forw_packet_aggr->skb, ETH_HLEN); + skb_reserve(forw_packet_aggr->skb, ETH_HLEN + NET_IP_ALIGN); INIT_HLIST_NODE(&forw_packet_aggr->list); diff --git a/icmp_socket.c b/icmp_socket.c index 5874c0e..f64e9c8 100644 --- a/icmp_socket.c +++ b/icmp_socket.c @@ -183,7 +183,7 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff, goto out; } - skb_reserve(skb, ETH_HLEN); + skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); icmp_packet = (struct batadv_icmp_packet_rr *)skb_put(skb, packet_len); if (copy_from_user(icmp_packet, buff, packet_len)) { diff --git a/translation-table.c b/translation-table.c index 6fecb94..bb3941c 100644 --- a/translation-table.c +++ b/translation-table.c @@ -1598,7 +1598,7 @@ batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, if (!skb) goto out; - skb_reserve(skb, ETH_HLEN); + skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); tt_response = (struct batadv_tt_query_packet *)skb_put(skb, len); tt_response->ttvn = ttvn; @@ -1663,7 +1663,7 @@ static int batadv_send_tt_request(struct batadv_priv *bat_priv, if (!skb) goto out; - skb_reserve(skb, ETH_HLEN); + skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); tt_req_len = sizeof(*tt_request); tt_request = (struct batadv_tt_query_packet *)skb_put(skb, tt_req_len); @@ -1765,7 +1765,7 @@ batadv_send_other_tt_response(struct batadv_priv *bat_priv, if (!skb) goto unlock; - skb_reserve(skb, ETH_HLEN); + skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); packet_pos = skb_put(skb, len); tt_response = (struct batadv_tt_query_packet *)packet_pos; tt_response->ttvn = req_ttvn; @@ -1884,7 +1884,7 @@ batadv_send_my_tt_response(struct batadv_priv *bat_priv, if (!skb) goto unlock; - skb_reserve(skb, ETH_HLEN); + skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); packet_pos = skb_put(skb, len); tt_response = (struct batadv_tt_query_packet *)packet_pos; tt_response->ttvn = req_ttvn; @@ -2215,7 +2215,7 @@ static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, if (!skb) goto out; - skb_reserve(skb, ETH_HLEN); + skb_reserve(skb, ETH_HLEN + NET_IP_ALIGN); roam_adv_packet = (struct batadv_roam_adv_packet *)skb_put(skb, len); diff --git a/vis.c b/vis.c index 79589a3..b004560 100644 --- a/vis.c +++ b/vis.c @@ -401,7 +401,7 @@ batadv_add_packet(struct batadv_priv *bat_priv, kfree(info); return NULL; } - skb_reserve(info->skb_packet, ETH_HLEN); + skb_reserve(info->skb_packet, ETH_HLEN + NET_IP_ALIGN); packet = (struct batadv_vis_packet *)skb_put(info->skb_packet, len); kref_init(&info->refcount); @@ -861,7 +861,7 @@ int batadv_vis_init(struct batadv_priv *bat_priv) if (!bat_priv->vis.my_info->skb_packet) goto free_info; - skb_reserve(bat_priv->vis.my_info->skb_packet, ETH_HLEN); + skb_reserve(bat_priv->vis.my_info->skb_packet, ETH_HLEN + NET_IP_ALIGN); tmp_skb = bat_priv->vis.my_info->skb_packet; packet = (struct batadv_vis_packet *)skb_put(tmp_skb, sizeof(*packet)); -- 1.7.10.4
