From 9b9eb518e3383d94c8b81ff403d524f2cee5b6b9 Mon Sep 17 00:00:00 2001 From: Somnath Kotur Date: Thu, 31 Oct 2019 01:07:47 -0400 Subject: bnxt_en: Add support for NAT(L3/L4 rewrite) Provides support for modifying L3/L4 Header parameters to support NAT. Sets the appropriate fields/bits in cfa_flow_alloc cmd. Sample cmd for offloading an IPv4 flow with SNAT: ovs-ofctl add-flow ovsbr0 "ip,nw_src=192.168.201.44 \ actions=mod_nw_src:203.31.220.144,output:p7p1" Replace 'nw_src' with 'nw_dst' in above cmd for DNAT with IPv4 Sample cmd for offloading an IPv4 flow with SNAPT: ovs-ofctl add-flow ovsbr0 "ip,nw_src=192.168.201.44 \ actions=mod_nw_src:203.31.220.144, mod_tp_src:6789,output:p7p1" Similar to DNAT, replace 'tp_src' with 'tp_dst' for offloading flow with DNAPT Sample cmd for offloading an IPv6 flow with SNAT: ovs-ofctl add-flow ovsbr0 "ipv6, ipv6_src=2001:5c0:9168::2/64 \ actions=load:0x1->NXM_NX_IPV6_SRC[0..63], \ load:0x20010db801920000->NXM_NX_IPV6_SRC[64..127],output:p7p1" Replace 'SRC' with DST' above for IPv6 DNAT Signed-off-by: Somnath Kotur Signed-off-by: Michael Chan Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c | 140 +++++++++++++++++++++++++-- 1 file changed, 134 insertions(+), 6 deletions(-) (limited to 'drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c') diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c index c35cde8a5b29..c801666a85fd 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c @@ -114,7 +114,8 @@ static int bnxt_tc_parse_tunnel_set(struct bnxt *bp, return 0; } -/* Key & Mask from the stack comes unaligned in multiple iterations. +/* Key & Mask from the stack comes unaligned in multiple iterations of 4 bytes + * each(u32). * This routine consolidates such multiple unaligned values into one * field each for Key & Mask (for src and dst macs separately) * For example, @@ -178,14 +179,19 @@ bnxt_fill_l2_rewrite_fields(struct bnxt_tc_actions *actions, static int bnxt_tc_parse_pedit(struct bnxt *bp, struct bnxt_tc_actions *actions, - struct flow_action_entry *act, u8 *eth_addr, + struct flow_action_entry *act, int act_idx, u8 *eth_addr, u8 *eth_addr_mask) { - u32 mask, val, offset; + size_t offset_of_ip6_daddr = offsetof(struct ipv6hdr, daddr); + size_t offset_of_ip6_saddr = offsetof(struct ipv6hdr, saddr); + u32 mask, val, offset, idx; u8 htype; offset = act->mangle.offset; htype = act->mangle.htype; + mask = ~act->mangle.mask; + val = act->mangle.val; + switch (htype) { case FLOW_ACT_MANGLE_HDR_TYPE_ETH: if (offset > PEDIT_OFFSET_SMAC_LAST_4_BYTES) { @@ -195,12 +201,73 @@ bnxt_tc_parse_pedit(struct bnxt *bp, struct bnxt_tc_actions *actions, return -EINVAL; } actions->flags |= BNXT_TC_ACTION_FLAG_L2_REWRITE; - mask = ~act->mangle.mask; - val = act->mangle.val; bnxt_set_l2_key_mask(val, mask, ð_addr[offset], ð_addr_mask[offset]); break; + case FLOW_ACT_MANGLE_HDR_TYPE_IP4: + actions->flags |= BNXT_TC_ACTION_FLAG_NAT_XLATE; + actions->nat.l3_is_ipv4 = true; + if (offset == offsetof(struct iphdr, saddr)) { + actions->nat.src_xlate = true; + actions->nat.l3.ipv4.saddr.s_addr = htonl(val); + } else if (offset == offsetof(struct iphdr, daddr)) { + actions->nat.src_xlate = false; + actions->nat.l3.ipv4.daddr.s_addr = htonl(val); + } else { + netdev_err(bp->dev, + "%s: IPv4_hdr: Invalid pedit field\n", + __func__); + return -EINVAL; + } + + netdev_dbg(bp->dev, "nat.src_xlate = %d src IP: %pI4 dst ip : %pI4\n", + actions->nat.src_xlate, &actions->nat.l3.ipv4.saddr, + &actions->nat.l3.ipv4.daddr); + break; + + case FLOW_ACT_MANGLE_HDR_TYPE_IP6: + actions->flags |= BNXT_TC_ACTION_FLAG_NAT_XLATE; + actions->nat.l3_is_ipv4 = false; + if (offset >= offsetof(struct ipv6hdr, saddr) && + offset < offset_of_ip6_daddr) { + /* 16 byte IPv6 address comes in 4 iterations of + * 4byte chunks each + */ + actions->nat.src_xlate = true; + idx = (offset - offset_of_ip6_saddr) / 4; + /* First 4bytes will be copied to idx 0 and so on */ + actions->nat.l3.ipv6.saddr.s6_addr32[idx] = htonl(val); + } else if (offset >= offset_of_ip6_daddr && + offset < offset_of_ip6_daddr + 16) { + actions->nat.src_xlate = false; + idx = (offset - offset_of_ip6_daddr) / 4; + actions->nat.l3.ipv6.saddr.s6_addr32[idx] = htonl(val); + } else { + netdev_err(bp->dev, + "%s: IPv6_hdr: Invalid pedit field\n", + __func__); + return -EINVAL; + } + break; + case FLOW_ACT_MANGLE_HDR_TYPE_TCP: + case FLOW_ACT_MANGLE_HDR_TYPE_UDP: + /* HW does not support L4 rewrite alone without L3 + * rewrite + */ + if (!(actions->flags & BNXT_TC_ACTION_FLAG_NAT_XLATE)) { + netdev_err(bp->dev, + "Need to specify L3 rewrite as well\n"); + return -EINVAL; + } + if (actions->nat.src_xlate) + actions->nat.l4.ports.sport = htons(val); + else + actions->nat.l4.ports.dport = htons(val); + netdev_dbg(bp->dev, "actions->nat.sport = %d dport = %d\n", + actions->nat.l4.ports.sport, + actions->nat.l4.ports.dport); + break; default: netdev_err(bp->dev, "%s: Unsupported pedit hdr type\n", __func__); @@ -258,7 +325,7 @@ static int bnxt_tc_parse_actions(struct bnxt *bp, break; /* Packet edit: L2 rewrite, NAT, NAPT */ case FLOW_ACTION_MANGLE: - rc = bnxt_tc_parse_pedit(bp, actions, act, + rc = bnxt_tc_parse_pedit(bp, actions, act, i, (u8 *)eth_addr, (u8 *)eth_addr_mask); if (rc) @@ -533,6 +600,67 @@ static int bnxt_hwrm_cfa_flow_alloc(struct bnxt *bp, struct bnxt_tc_flow *flow, CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_L2_HEADER_REWRITE; } + if (actions->flags & BNXT_TC_ACTION_FLAG_NAT_XLATE) { + if (actions->nat.l3_is_ipv4) { + action_flags |= + CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_NAT_IPV4_ADDRESS; + + if (actions->nat.src_xlate) { + action_flags |= + CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_NAT_SRC; + /* L3 source rewrite */ + req.nat_ip_address[0] = + actions->nat.l3.ipv4.saddr.s_addr; + /* L4 source port */ + if (actions->nat.l4.ports.sport) + req.nat_port = + actions->nat.l4.ports.sport; + } else { + action_flags |= + CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_NAT_DEST; + /* L3 destination rewrite */ + req.nat_ip_address[0] = + actions->nat.l3.ipv4.daddr.s_addr; + /* L4 destination port */ + if (actions->nat.l4.ports.dport) + req.nat_port = + actions->nat.l4.ports.dport; + } + netdev_dbg(bp->dev, + "req.nat_ip_address: %pI4 src_xlate: %d req.nat_port: %x\n", + req.nat_ip_address, actions->nat.src_xlate, + req.nat_port); + } else { + if (actions->nat.src_xlate) { + action_flags |= + CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_NAT_SRC; + /* L3 source rewrite */ + memcpy(req.nat_ip_address, + actions->nat.l3.ipv6.saddr.s6_addr32, + sizeof(req.nat_ip_address)); + /* L4 source port */ + if (actions->nat.l4.ports.sport) + req.nat_port = + actions->nat.l4.ports.sport; + } else { + action_flags |= + CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_NAT_DEST; + /* L3 destination rewrite */ + memcpy(req.nat_ip_address, + actions->nat.l3.ipv6.daddr.s6_addr32, + sizeof(req.nat_ip_address)); + /* L4 destination port */ + if (actions->nat.l4.ports.dport) + req.nat_port = + actions->nat.l4.ports.dport; + } + netdev_dbg(bp->dev, + "req.nat_ip_address: %pI6 src_xlate: %d req.nat_port: %x\n", + req.nat_ip_address, actions->nat.src_xlate, + req.nat_port); + } + } + if (actions->flags & BNXT_TC_ACTION_FLAG_TUNNEL_DECAP || actions->flags & BNXT_TC_ACTION_FLAG_TUNNEL_ENCAP) { req.tunnel_handle = tunnel_handle; -- cgit v1.2.3-59-g8ed1b