X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=net%2Fieee80211%2Fieee80211_tx.c;h=23a1f88de7cbb633c5216fa4df849f9c7dfe0ee9;hb=1264fc0498e1e20f97b1ab690e523e7a7fc50eab;hp=a3054c5c0c050058f1b306da7fca976794a0c01d;hpb=716b43303df605510399d6da0d0dd4e2ea376e7c;p=linux-2.6-block.git diff --git a/net/ieee80211/ieee80211_tx.c b/net/ieee80211/ieee80211_tx.c index a3054c5c0c05..23a1f88de7cb 100644 --- a/net/ieee80211/ieee80211_tx.c +++ b/net/ieee80211/ieee80211_tx.c @@ -33,7 +33,6 @@ #include #include #include -#include #include #include #include @@ -46,10 +45,8 @@ #include - /* - 802.11 Data Frame ,-------------------------------------------------------------------. @@ -83,7 +80,6 @@ Desc. | IV | Encrypted | ICV | `-----------------------' Total: 8 non-data bytes - 802.3 Ethernet Data Frame ,-----------------------------------------. @@ -132,7 +128,7 @@ payload of each frame is reduced to 492 bytes. static u8 P802_1H_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0xf8 }; static u8 RFC1042_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0x00 }; -static inline int ieee80211_put_snap(u8 *data, u16 h_proto) +static inline int ieee80211_copy_snap(u8 * data, u16 h_proto) { struct ieee80211_snap_hdr *snap; u8 *oui; @@ -150,44 +146,22 @@ static inline int ieee80211_put_snap(u8 *data, u16 h_proto) snap->oui[1] = oui[1]; snap->oui[2] = oui[2]; - *(u16 *)(data + SNAP_SIZE) = htons(h_proto); + *(u16 *) (data + SNAP_SIZE) = htons(h_proto); return SNAP_SIZE + sizeof(u16); } -static inline int ieee80211_encrypt_fragment( - struct ieee80211_device *ieee, - struct sk_buff *frag, - int hdr_len) +static inline int ieee80211_encrypt_fragment(struct ieee80211_device *ieee, + struct sk_buff *frag, int hdr_len) { - struct ieee80211_crypt_data* crypt = ieee->crypt[ieee->tx_keyidx]; + struct ieee80211_crypt_data *crypt = ieee->crypt[ieee->tx_keyidx]; int res; -#ifdef CONFIG_IEEE80211_CRYPT_TKIP - struct ieee80211_hdr *header; - - if (ieee->tkip_countermeasures && - crypt && crypt->ops && strcmp(crypt->ops->name, "TKIP") == 0) { - header = (struct ieee80211_hdr *) frag->data; - if (net_ratelimit()) { - printk(KERN_DEBUG "%s: TKIP countermeasures: dropped " - "TX packet to " MAC_FMT "\n", - ieee->dev->name, MAC_ARG(header->addr1)); - } - return -1; - } -#endif /* To encrypt, frame format is: * IV (4 bytes), clear payload (including SNAP), ICV (4 bytes) */ - - // PR: FIXME: Copied from hostap. Check fragmentation/MSDU/MPDU encryption. - /* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so - * call both MSDU and MPDU encryption functions from here. */ atomic_inc(&crypt->refcnt); res = 0; - if (crypt->ops->encrypt_msdu) - res = crypt->ops->encrypt_msdu(frag, hdr_len, crypt->priv); - if (res == 0 && crypt->ops->encrypt_mpdu) + if (crypt->ops->encrypt_mpdu) res = crypt->ops->encrypt_mpdu(frag, hdr_len, crypt->priv); atomic_dec(&crypt->refcnt); @@ -201,8 +175,8 @@ static inline int ieee80211_encrypt_fragment( return 0; } - -void ieee80211_txb_free(struct ieee80211_txb *txb) { +void ieee80211_txb_free(struct ieee80211_txb *txb) +{ int i; if (unlikely(!txb)) return; @@ -217,9 +191,8 @@ static struct ieee80211_txb *ieee80211_alloc_txb(int nr_frags, int txb_size, { struct ieee80211_txb *txb; int i; - txb = kmalloc( - sizeof(struct ieee80211_txb) + (sizeof(u8*) * nr_frags), - gfp_mask); + txb = kmalloc(sizeof(struct ieee80211_txb) + (sizeof(u8 *) * nr_frags), + gfp_mask); if (!txb) return NULL; @@ -243,34 +216,34 @@ static struct ieee80211_txb *ieee80211_alloc_txb(int nr_frags, int txb_size, return txb; } -/* SKBs are added to the ieee->tx_queue. */ -int ieee80211_xmit(struct sk_buff *skb, - struct net_device *dev) +/* Incoming skb is converted to a txb which consists of + * a block of 802.11 fragment packets (stored as skbs) */ +int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev) { struct ieee80211_device *ieee = netdev_priv(dev); struct ieee80211_txb *txb = NULL; - struct ieee80211_hdr *frag_hdr; - int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size; + struct ieee80211_hdr_3addr *frag_hdr; + int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size, + rts_required; unsigned long flags; struct net_device_stats *stats = &ieee->stats; - int ether_type, encrypt; + int ether_type, encrypt, host_encrypt, host_encrypt_msdu; int bytes, fc, hdr_len; struct sk_buff *skb_frag; - struct ieee80211_hdr header = { /* Ensure zero initialized */ + struct ieee80211_hdr_3addr header = { /* Ensure zero initialized */ .duration_id = 0, .seq_ctl = 0 }; u8 dest[ETH_ALEN], src[ETH_ALEN]; - - struct ieee80211_crypt_data* crypt; + struct ieee80211_crypt_data *crypt; + int snapped = 0; spin_lock_irqsave(&ieee->lock, flags); /* If there is no driver handler to take the TXB, dont' bother * creating it... */ if (!ieee->hard_start_xmit) { - printk(KERN_WARNING "%s: No xmit handler.\n", - ieee->dev->name); + printk(KERN_WARNING "%s: No xmit handler.\n", ieee->dev->name); goto success; } @@ -285,7 +258,9 @@ int ieee80211_xmit(struct sk_buff *skb, crypt = ieee->crypt[ieee->tx_keyidx]; encrypt = !(ether_type == ETH_P_PAE && ieee->ieee802_1x) && - ieee->host_encrypt && crypt && crypt->ops; + ieee->sec.encrypt; + host_encrypt = ieee->host_encrypt && encrypt; + host_encrypt_msdu = ieee->host_encrypt_msdu && encrypt; if (!encrypt && ieee->ieee802_1x && ieee->drop_unencrypted && ether_type != ETH_P_PAE) { @@ -293,18 +268,9 @@ int ieee80211_xmit(struct sk_buff *skb, goto success; } -#ifdef CONFIG_IEEE80211_DEBUG - if (crypt && !encrypt && ether_type == ETH_P_PAE) { - struct eapol *eap = (struct eapol *)(skb->data + - sizeof(struct ethhdr) - SNAP_SIZE - sizeof(u16)); - IEEE80211_DEBUG_EAP("TX: IEEE 802.11 EAPOL frame: %s\n", - eap_get_type(eap->type)); - } -#endif - /* Save source and destination addresses */ - memcpy(&dest, skb->data, ETH_ALEN); - memcpy(&src, skb->data+ETH_ALEN, ETH_ALEN); + memcpy(dest, skb->data, ETH_ALEN); + memcpy(src, skb->data + ETH_ALEN, ETH_ALEN); /* Advance the SKB to the start of the payload */ skb_pull(skb, sizeof(struct ethhdr)); @@ -312,59 +278,96 @@ int ieee80211_xmit(struct sk_buff *skb, /* Determine total amount of storage required for TXB packets */ bytes = skb->len + SNAP_SIZE + sizeof(u16); - if (encrypt) + if (host_encrypt) fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA | - IEEE80211_FCTL_WEP; + IEEE80211_FCTL_PROTECTED; else fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA; if (ieee->iw_mode == IW_MODE_INFRA) { fc |= IEEE80211_FCTL_TODS; - /* To DS: Addr1 = BSSID, Addr2 = SA, - Addr3 = DA */ - memcpy(&header.addr1, ieee->bssid, ETH_ALEN); - memcpy(&header.addr2, &src, ETH_ALEN); - memcpy(&header.addr3, &dest, ETH_ALEN); + /* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */ + memcpy(header.addr1, ieee->bssid, ETH_ALEN); + memcpy(header.addr2, src, ETH_ALEN); + memcpy(header.addr3, dest, ETH_ALEN); } else if (ieee->iw_mode == IW_MODE_ADHOC) { - /* not From/To DS: Addr1 = DA, Addr2 = SA, - Addr3 = BSSID */ - memcpy(&header.addr1, dest, ETH_ALEN); - memcpy(&header.addr2, src, ETH_ALEN); - memcpy(&header.addr3, ieee->bssid, ETH_ALEN); + /* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */ + memcpy(header.addr1, dest, ETH_ALEN); + memcpy(header.addr2, src, ETH_ALEN); + memcpy(header.addr3, ieee->bssid, ETH_ALEN); } header.frame_ctl = cpu_to_le16(fc); hdr_len = IEEE80211_3ADDR_LEN; - /* Determine fragmentation size based on destination (multicast - * and broadcast are not fragmented) */ - if (is_multicast_ether_addr(dest) || - is_broadcast_ether_addr(dest)) - frag_size = MAX_FRAG_THRESHOLD; - else - frag_size = ieee->fts; + /* Encrypt msdu first on the whole data packet. */ + if ((host_encrypt || host_encrypt_msdu) && + crypt && crypt->ops && crypt->ops->encrypt_msdu) { + int res = 0; + int len = bytes + hdr_len + crypt->ops->extra_msdu_prefix_len + + crypt->ops->extra_msdu_postfix_len; + struct sk_buff *skb_new = dev_alloc_skb(len); + if (unlikely(!skb_new)) + goto failed; + skb_reserve(skb_new, crypt->ops->extra_msdu_prefix_len); + memcpy(skb_put(skb_new, hdr_len), &header, hdr_len); + snapped = 1; + ieee80211_copy_snap(skb_put(skb_new, SNAP_SIZE + sizeof(u16)), + ether_type); + memcpy(skb_put(skb_new, skb->len), skb->data, skb->len); + res = crypt->ops->encrypt_msdu(skb_new, hdr_len, crypt->priv); + if (res < 0) { + IEEE80211_ERROR("msdu encryption failed\n"); + dev_kfree_skb_any(skb_new); + goto failed; + } + dev_kfree_skb_any(skb); + skb = skb_new; + bytes += crypt->ops->extra_msdu_prefix_len + + crypt->ops->extra_msdu_postfix_len; + skb_pull(skb, hdr_len); + } - /* Determine amount of payload per fragment. Regardless of if - * this stack is providing the full 802.11 header, one will - * eventually be affixed to this fragment -- so we must account for - * it when determining the amount of payload space. */ - bytes_per_frag = frag_size - IEEE80211_3ADDR_LEN; - if (ieee->config & - (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS)) - bytes_per_frag -= IEEE80211_FCS_LEN; - - /* Each fragment may need to have room for encryptiong pre/postfix */ - if (encrypt) - bytes_per_frag -= crypt->ops->extra_prefix_len + - crypt->ops->extra_postfix_len; - - /* Number of fragments is the total bytes_per_frag / - * payload_per_fragment */ - nr_frags = bytes / bytes_per_frag; - bytes_last_frag = bytes % bytes_per_frag; - if (bytes_last_frag) + if (host_encrypt || ieee->host_open_frag) { + /* Determine fragmentation size based on destination (multicast + * and broadcast are not fragmented) */ + if (is_multicast_ether_addr(dest)) + frag_size = MAX_FRAG_THRESHOLD; + else + frag_size = ieee->fts; + + /* Determine amount of payload per fragment. Regardless of if + * this stack is providing the full 802.11 header, one will + * eventually be affixed to this fragment -- so we must account + * for it when determining the amount of payload space. */ + bytes_per_frag = frag_size - IEEE80211_3ADDR_LEN; + if (ieee->config & + (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS)) + bytes_per_frag -= IEEE80211_FCS_LEN; + + /* Each fragment may need to have room for encryptiong + * pre/postfix */ + if (host_encrypt) + bytes_per_frag -= crypt->ops->extra_mpdu_prefix_len + + crypt->ops->extra_mpdu_postfix_len; + + /* Number of fragments is the total + * bytes_per_frag / payload_per_fragment */ + nr_frags = bytes / bytes_per_frag; + bytes_last_frag = bytes % bytes_per_frag; + if (bytes_last_frag) + nr_frags++; + else + bytes_last_frag = bytes_per_frag; + } else { + nr_frags = 1; + bytes_per_frag = bytes_last_frag = bytes; + frag_size = bytes + IEEE80211_3ADDR_LEN; + } + + rts_required = (frag_size > ieee->rts + && ieee->config & CFG_IEEE80211_RTS); + if (rts_required) nr_frags++; - else - bytes_last_frag = bytes_per_frag; /* When we allocate the TXB we allocate enough space for the reserve * and full fragment bytes (bytes_per_frag doesn't include prefix, @@ -376,33 +379,64 @@ int ieee80211_xmit(struct sk_buff *skb, goto failed; } txb->encrypted = encrypt; - txb->payload_size = bytes; + if (host_encrypt) + txb->payload_size = frag_size * (nr_frags - 1) + + bytes_last_frag; + else + txb->payload_size = bytes; + + if (rts_required) { + skb_frag = txb->fragments[0]; + frag_hdr = + (struct ieee80211_hdr_3addr *)skb_put(skb_frag, hdr_len); + + /* + * Set header frame_ctl to the RTS. + */ + header.frame_ctl = + cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); + memcpy(frag_hdr, &header, hdr_len); - for (i = 0; i < nr_frags; i++) { + /* + * Restore header frame_ctl to the original data setting. + */ + header.frame_ctl = cpu_to_le16(fc); + + if (ieee->config & + (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS)) + skb_put(skb_frag, 4); + + txb->rts_included = 1; + i = 1; + } else + i = 0; + + for (; i < nr_frags; i++) { skb_frag = txb->fragments[i]; - if (encrypt) - skb_reserve(skb_frag, crypt->ops->extra_prefix_len); + if (host_encrypt) + skb_reserve(skb_frag, + crypt->ops->extra_mpdu_prefix_len); - frag_hdr = (struct ieee80211_hdr *)skb_put(skb_frag, hdr_len); + frag_hdr = + (struct ieee80211_hdr_3addr *)skb_put(skb_frag, hdr_len); memcpy(frag_hdr, &header, hdr_len); /* If this is not the last fragment, then add the MOREFRAGS * bit to the frame control */ if (i != nr_frags - 1) { - frag_hdr->frame_ctl = cpu_to_le16( - fc | IEEE80211_FCTL_MOREFRAGS); + frag_hdr->frame_ctl = + cpu_to_le16(fc | IEEE80211_FCTL_MOREFRAGS); bytes = bytes_per_frag; } else { /* The last fragment takes the remaining length */ bytes = bytes_last_frag; } - /* Put a SNAP header on the first fragment */ - if (i == 0) { - ieee80211_put_snap( - skb_put(skb_frag, SNAP_SIZE + sizeof(u16)), - ether_type); + if (i == 0 && !snapped) { + ieee80211_copy_snap(skb_put + (skb_frag, SNAP_SIZE + sizeof(u16)), + ether_type); bytes -= SNAP_SIZE + sizeof(u16); } @@ -413,21 +447,22 @@ int ieee80211_xmit(struct sk_buff *skb, /* Encryption routine will move the header forward in order * to insert the IV between the header and the payload */ - if (encrypt) + if (host_encrypt) ieee80211_encrypt_fragment(ieee, skb_frag, hdr_len); + if (ieee->config & (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS)) skb_put(skb_frag, 4); } - - success: + success: spin_unlock_irqrestore(&ieee->lock, flags); dev_kfree_skb_any(skb); if (txb) { - if ((*ieee->hard_start_xmit)(txb, dev) == 0) { + int ret = (*ieee->hard_start_xmit) (txb, dev); + if (ret == 0) { stats->tx_packets++; stats->tx_bytes += txb->payload_size; return 0; @@ -437,12 +472,76 @@ int ieee80211_xmit(struct sk_buff *skb, return 0; - failed: + failed: spin_unlock_irqrestore(&ieee->lock, flags); netif_stop_queue(dev); stats->tx_errors++; return 1; +} + +/* Incoming 802.11 strucure is converted to a TXB + * a block of 802.11 fragment packets (stored as skbs) */ +int ieee80211_tx_frame(struct ieee80211_device *ieee, + struct ieee80211_hdr *frame, int len) +{ + struct ieee80211_txb *txb = NULL; + unsigned long flags; + struct net_device_stats *stats = &ieee->stats; + struct sk_buff *skb_frag; + + spin_lock_irqsave(&ieee->lock, flags); + /* If there is no driver handler to take the TXB, dont' bother + * creating it... */ + if (!ieee->hard_start_xmit) { + printk(KERN_WARNING "%s: No xmit handler.\n", ieee->dev->name); + goto success; + } + + if (unlikely(len < 24)) { + printk(KERN_WARNING "%s: skb too small (%d).\n", + ieee->dev->name, len); + goto success; + } + + /* When we allocate the TXB we allocate enough space for the reserve + * and full fragment bytes (bytes_per_frag doesn't include prefix, + * postfix, header, FCS, etc.) */ + txb = ieee80211_alloc_txb(1, len, GFP_ATOMIC); + if (unlikely(!txb)) { + printk(KERN_WARNING "%s: Could not allocate TXB\n", + ieee->dev->name); + goto failed; + } + txb->encrypted = 0; + txb->payload_size = len; + + skb_frag = txb->fragments[0]; + + memcpy(skb_put(skb_frag, len), frame, len); + + if (ieee->config & + (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS)) + skb_put(skb_frag, 4); + + success: + spin_unlock_irqrestore(&ieee->lock, flags); + + if (txb) { + if ((*ieee->hard_start_xmit) (txb, ieee->dev) == 0) { + stats->tx_packets++; + stats->tx_bytes += txb->payload_size; + return 0; + } + ieee80211_txb_free(txb); + } + return 0; + + failed: + spin_unlock_irqrestore(&ieee->lock, flags); + stats->tx_errors++; + return 1; } +EXPORT_SYMBOL(ieee80211_tx_frame); EXPORT_SYMBOL(ieee80211_txb_free);