2 * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
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6 * General Public License (GPL) Version 2, available from the file
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8 * OpenIB.org BSD license below:
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11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
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21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 #include <crypto/aead.h>
38 #include "en_accel/ipsec_rxtx.h"
39 #include "en_accel/ipsec.h"
43 MLX5E_IPSEC_RX_SYNDROME_DECRYPTED = 0x11,
44 MLX5E_IPSEC_RX_SYNDROME_AUTH_FAILED = 0x12,
47 struct mlx5e_ipsec_rx_metadata {
48 unsigned char reserved;
53 MLX5E_IPSEC_TX_SYNDROME_OFFLOAD = 0x8,
54 MLX5E_IPSEC_TX_SYNDROME_OFFLOAD_WITH_LSO_TCP = 0x9,
57 struct mlx5e_ipsec_tx_metadata {
58 __be16 mss_inv; /* 1/MSS in 16bit fixed point, only for LSO */
59 __be16 seq; /* LSBs of the first TCP seq, only for LSO */
60 u8 esp_next_proto; /* Next protocol of ESP */
63 struct mlx5e_ipsec_metadata {
64 unsigned char syndrome;
67 /* from FPGA to host, on successful decrypt */
68 struct mlx5e_ipsec_rx_metadata rx;
69 /* from host to FPGA */
70 struct mlx5e_ipsec_tx_metadata tx;
72 /* packet type ID field */
76 #define MAX_LSO_MSS 2048
78 /* Pre-calculated (Q0.16) fixed-point inverse 1/x function */
79 static __be16 mlx5e_ipsec_inverse_table[MAX_LSO_MSS];
81 static inline __be16 mlx5e_ipsec_mss_inv(struct sk_buff *skb)
83 return mlx5e_ipsec_inverse_table[skb_shinfo(skb)->gso_size];
86 static struct mlx5e_ipsec_metadata *mlx5e_ipsec_add_metadata(struct sk_buff *skb)
88 struct mlx5e_ipsec_metadata *mdata;
91 if (unlikely(skb_cow_head(skb, sizeof(*mdata))))
92 return ERR_PTR(-ENOMEM);
94 eth = (struct ethhdr *)skb_push(skb, sizeof(*mdata));
95 skb->mac_header -= sizeof(*mdata);
96 mdata = (struct mlx5e_ipsec_metadata *)(eth + 1);
98 memmove(skb->data, skb->data + sizeof(*mdata),
101 eth->h_proto = cpu_to_be16(MLX5E_METADATA_ETHER_TYPE);
103 memset(mdata->content.raw, 0, sizeof(mdata->content.raw));
107 static int mlx5e_ipsec_remove_trailer(struct sk_buff *skb, struct xfrm_state *x)
109 unsigned int alen = crypto_aead_authsize(x->data);
110 struct ipv6hdr *ipv6hdr = ipv6_hdr(skb);
111 struct iphdr *ipv4hdr = ip_hdr(skb);
112 unsigned int trailer_len;
116 ret = skb_copy_bits(skb, skb->len - alen - 2, &plen, 1);
120 trailer_len = alen + plen + 2;
122 pskb_trim(skb, skb->len - trailer_len);
123 if (skb->protocol == htons(ETH_P_IP)) {
124 ipv4hdr->tot_len = htons(ntohs(ipv4hdr->tot_len) - trailer_len);
125 ip_send_check(ipv4hdr);
127 ipv6hdr->payload_len = htons(ntohs(ipv6hdr->payload_len) -
133 static void mlx5e_ipsec_set_swp(struct sk_buff *skb,
134 struct mlx5_wqe_eth_seg *eseg, u8 mode,
135 struct xfrm_offload *xo)
140 * SWP: OutL3 InL3 InL4
141 * Pkt: MAC IP ESP IP L4
148 * Offsets are in 2-byte words, counting from start of frame
150 eseg->swp_outer_l3_offset = skb_network_offset(skb) / 2;
151 if (skb->protocol == htons(ETH_P_IPV6))
152 eseg->swp_flags |= MLX5_ETH_WQE_SWP_OUTER_L3_IPV6;
154 if (mode == XFRM_MODE_TUNNEL) {
155 eseg->swp_inner_l3_offset = skb_inner_network_offset(skb) / 2;
156 if (xo->proto == IPPROTO_IPV6) {
157 eseg->swp_flags |= MLX5_ETH_WQE_SWP_INNER_L3_IPV6;
158 proto = inner_ipv6_hdr(skb)->nexthdr;
160 proto = inner_ip_hdr(skb)->protocol;
163 eseg->swp_inner_l3_offset = skb_network_offset(skb) / 2;
164 if (skb->protocol == htons(ETH_P_IPV6))
165 eseg->swp_flags |= MLX5_ETH_WQE_SWP_INNER_L3_IPV6;
170 eseg->swp_flags |= MLX5_ETH_WQE_SWP_INNER_L4_UDP;
173 eseg->swp_inner_l4_offset = skb_inner_transport_offset(skb) / 2;
178 static void mlx5e_ipsec_set_iv(struct sk_buff *skb, struct xfrm_offload *xo)
183 /* Place the SN in the IV field */
184 seqno = cpu_to_be64(xo->seq.low + ((u64)xo->seq.hi << 32));
185 iv_offset = skb_transport_offset(skb) + sizeof(struct ip_esp_hdr);
186 skb_store_bits(skb, iv_offset, &seqno, 8);
189 static void mlx5e_ipsec_set_metadata(struct sk_buff *skb,
190 struct mlx5e_ipsec_metadata *mdata,
191 struct xfrm_offload *xo)
193 struct ip_esp_hdr *esph;
196 if (skb_is_gso(skb)) {
197 /* Add LSO metadata indication */
198 esph = ip_esp_hdr(skb);
199 tcph = inner_tcp_hdr(skb);
200 netdev_dbg(skb->dev, " Offloading GSO packet outer L3 %u; L4 %u; Inner L3 %u; L4 %u\n",
202 skb->transport_header,
203 skb->inner_network_header,
204 skb->inner_transport_header);
205 netdev_dbg(skb->dev, " Offloading GSO packet of len %u; mss %u; TCP sp %u dp %u seq 0x%x ESP seq 0x%x\n",
206 skb->len, skb_shinfo(skb)->gso_size,
207 ntohs(tcph->source), ntohs(tcph->dest),
208 ntohl(tcph->seq), ntohl(esph->seq_no));
209 mdata->syndrome = MLX5E_IPSEC_TX_SYNDROME_OFFLOAD_WITH_LSO_TCP;
210 mdata->content.tx.mss_inv = mlx5e_ipsec_mss_inv(skb);
211 mdata->content.tx.seq = htons(ntohl(tcph->seq) & 0xFFFF);
213 mdata->syndrome = MLX5E_IPSEC_TX_SYNDROME_OFFLOAD;
215 mdata->content.tx.esp_next_proto = xo->proto;
217 netdev_dbg(skb->dev, " TX metadata syndrome %u proto %u mss_inv %04x seq %04x\n",
218 mdata->syndrome, mdata->content.tx.esp_next_proto,
219 ntohs(mdata->content.tx.mss_inv),
220 ntohs(mdata->content.tx.seq));
223 struct sk_buff *mlx5e_ipsec_handle_tx_skb(struct net_device *netdev,
224 struct mlx5e_tx_wqe *wqe,
227 struct mlx5e_priv *priv = netdev_priv(netdev);
228 struct xfrm_offload *xo = xfrm_offload(skb);
229 struct mlx5e_ipsec_metadata *mdata;
230 struct xfrm_state *x;
235 if (unlikely(skb->sp->len != 1)) {
236 atomic64_inc(&priv->ipsec->sw_stats.ipsec_tx_drop_bundle);
240 x = xfrm_input_state(skb);
242 atomic64_inc(&priv->ipsec->sw_stats.ipsec_tx_drop_no_state);
246 if (unlikely(!x->xso.offload_handle ||
247 (skb->protocol != htons(ETH_P_IP) &&
248 skb->protocol != htons(ETH_P_IPV6)))) {
249 atomic64_inc(&priv->ipsec->sw_stats.ipsec_tx_drop_not_ip);
253 if (!skb_is_gso(skb))
254 if (unlikely(mlx5e_ipsec_remove_trailer(skb, x))) {
255 atomic64_inc(&priv->ipsec->sw_stats.ipsec_tx_drop_trailer);
258 mdata = mlx5e_ipsec_add_metadata(skb);
259 if (unlikely(IS_ERR(mdata))) {
260 atomic64_inc(&priv->ipsec->sw_stats.ipsec_tx_drop_metadata);
263 mlx5e_ipsec_set_swp(skb, &wqe->eth, x->props.mode, xo);
264 mlx5e_ipsec_set_iv(skb, xo);
265 mlx5e_ipsec_set_metadata(skb, mdata, xo);
274 static inline struct xfrm_state *
275 mlx5e_ipsec_build_sp(struct net_device *netdev, struct sk_buff *skb,
276 struct mlx5e_ipsec_metadata *mdata)
278 struct mlx5e_priv *priv = netdev_priv(netdev);
279 struct xfrm_offload *xo;
280 struct xfrm_state *xs;
283 skb->sp = secpath_dup(skb->sp);
284 if (unlikely(!skb->sp)) {
285 atomic64_inc(&priv->ipsec->sw_stats.ipsec_rx_drop_sp_alloc);
289 sa_handle = be32_to_cpu(mdata->content.rx.sa_handle);
290 xs = mlx5e_ipsec_sadb_rx_lookup(priv->ipsec, sa_handle);
292 atomic64_inc(&priv->ipsec->sw_stats.ipsec_rx_drop_sadb_miss);
296 skb->sp->xvec[skb->sp->len++] = xs;
299 xo = xfrm_offload(skb);
300 xo->flags = CRYPTO_DONE;
301 switch (mdata->syndrome) {
302 case MLX5E_IPSEC_RX_SYNDROME_DECRYPTED:
303 xo->status = CRYPTO_SUCCESS;
305 case MLX5E_IPSEC_RX_SYNDROME_AUTH_FAILED:
306 xo->status = CRYPTO_TUNNEL_ESP_AUTH_FAILED;
309 atomic64_inc(&priv->ipsec->sw_stats.ipsec_rx_drop_syndrome);
315 struct sk_buff *mlx5e_ipsec_handle_rx_skb(struct net_device *netdev,
318 struct mlx5e_ipsec_metadata *mdata;
319 struct ethhdr *old_eth;
320 struct ethhdr *new_eth;
321 struct xfrm_state *xs;
324 /* Detect inline metadata */
325 if (skb->len < ETH_HLEN + MLX5E_METADATA_ETHER_LEN)
327 ethtype = (__be16 *)(skb->data + ETH_ALEN * 2);
328 if (*ethtype != cpu_to_be16(MLX5E_METADATA_ETHER_TYPE))
331 /* Use the metadata */
332 mdata = (struct mlx5e_ipsec_metadata *)(skb->data + ETH_HLEN);
333 xs = mlx5e_ipsec_build_sp(netdev, skb, mdata);
339 /* Remove the metadata from the buffer */
340 old_eth = (struct ethhdr *)skb->data;
341 new_eth = (struct ethhdr *)(skb->data + MLX5E_METADATA_ETHER_LEN);
342 memmove(new_eth, old_eth, 2 * ETH_ALEN);
343 /* Ethertype is already in its new place */
344 skb_pull_inline(skb, MLX5E_METADATA_ETHER_LEN);
349 bool mlx5e_ipsec_feature_check(struct sk_buff *skb, struct net_device *netdev,
350 netdev_features_t features)
352 struct xfrm_state *x;
354 if (skb->sp && skb->sp->len) {
355 x = skb->sp->xvec[0];
356 if (x && x->xso.offload_handle)
362 void mlx5e_ipsec_build_inverse_table(void)
367 /* Calculate 1/x inverse table for use in GSO data path.
368 * Using this table, we provide the IPSec accelerator with the value of
369 * 1/gso_size so that it can infer the position of each segment inside
370 * the GSO, and increment the ESP sequence number, and generate the IV.
371 * The HW needs this value in Q0.16 fixed-point number format
373 mlx5e_ipsec_inverse_table[1] = htons(0xFFFF);
374 for (mss = 2; mss < MAX_LSO_MSS; mss++) {
375 mss_inv = div_u64(1ULL << 32, mss) >> 16;
376 mlx5e_ipsec_inverse_table[mss] = htons(mss_inv);